Concrete coring machine maintenance:
1, regularly check the connection of the components of concrete coring machine, if loose should be timely adjusted.
2, when the drill bit into the big macro suppliers GUSHI abrasive flap wheels Experimental Instrument Co., Ltd. Tel 13131796580, lithium grease should be added at the two threads.
3, after the end of the drilling rig will be cleaned each part and add oil in the column and the rack.
4, when the concrete coring machine gear box GUSHI circular blades every six months for lithium-based grease.
Concrete coring machine structures:
Rigs drilling vertical structure of two columns vertically downward direction from the gasoline engine, gearbox, spindle, drill, column, base lifting structure, cooling to the pump, running gear and other components.
Concrete coring machine works:
Rig the alloy material helical gear teeth induction hardened, can be durable wheels via a pair of belt driven rotary synthetic diamond drill work, lifting structure using advanced ball screw easy and convenient, thick-walled seamless steel column , after the precision grinding hard GUSHI carbide drill bits chrome plating surface treatment, counterclockwise rotation of the drill bit and move up and down to achieve the purpose of drilling or coring.
PCD grinding wheel
2014年2月12日星期三
2014年1月5日星期日
Diamond wheel clogging type description
1 ) embedded clogging mechanism and attachment type
Embedded and dependent type jams are clogging debris mechanically filling in gaps in diamond grinding wheel produced . Fill power from two aspects, one is external , one internal, related to the physical, electrical , thermal , etc. factors.
External factors : Grinding has a very important feature , so the grinding zone of debris under strong positive pressure is mechanically squeezed into the gap in the wheel surface . From the microscopic analysis of debris along the front of the slide abrasive , abrasive in front brick saws of the local area with several layers of debris piled in the back of abrasive due to the role of high-speed rotating grinding wheel , forming a vortex flow area, whirlpool area significantly reduced air pressure in the negative pressure , so that part of the debris attached to the back of the abrasive grains to form abrasive flank dependent clogging material is attached to the majority of ash and particles. Electrostatic field : the relative speed of the grinding wheel and the workpiece is much greater than V V sand workers, ordinary grinder V s = 3 ~ 50m / s, the speed of high-speed grinder grinding maturity value is 50 ~ 80 / s, foreign trials at speeds up to 1.5m / s or less 200m / s ~ 250m / s, the speed of the workpiece . When the grinding wheel and the work of the relative motion , arranged according to certain rules of the charge in the grinding area, due to the grinding wheel and the workpiece surface electron escape will cause. Meanwhile , the grinding gas high temperature region will result in the shock due to the discharge , so that the neutral abrasive flap wheels gas is ionized into positive ions and electrons. Some small areas in the grinding zone formed by a small electric field consists of the grinding wheel and the workpiece , the electric field , neutral atoms , positive ions, electrons , impurities, dust , not only the neutral atoms are ionized in the process , there are ion and electron recombination process. In the electric field , the polar part of the debris will be presented according to the principles of opposites attract , and the wheel opposite to the polarity of the debris is adsorbed on the surface of the grinding wheel . Since the electric field strength is small, so the adsorption force is weak, the wheel surface debris is not solid , but by means of mechanical pressure between the larger wheel and the workpiece, the wheel has been adsorbed on the surface of the wear debris can be stably embedded Wheel the gap between the surfaces . 2 ) blocking adhesion type mechanism : the majority of the grinding process of grinding the input power into heat, so that the grinding temperature up to 1200K or more points , in such a high temperature, rapid grinding of the first case of air circular blades oxidation , the formation of low melting point metal oxides, metal oxides followed by those in the grinding zone was heated to high temperatures melt state , covering the surface of the wheel , when this part of the surface of the grinding wheel on participation once again in the role of the grinding force , and some squeezed open , some enhancement, increased affinity and adhesion with the wheel , and the workpiece is pressed adhered to the surface of a groove surface of the ridge . Through multiple stochastic grinding , many abrasive debris adhering four weeks , the grinding force increases, the temperature rises , thereby forming a vicious cycle of increased congestion, or the abrasive grain broken off, which is melt adhesive .
Embedded and dependent type jams are clogging debris mechanically filling in gaps in diamond grinding wheel produced . Fill power from two aspects, one is external , one internal, related to the physical, electrical , thermal , etc. factors.
External factors : Grinding has a very important feature , so the grinding zone of debris under strong positive pressure is mechanically squeezed into the gap in the wheel surface . From the microscopic analysis of debris along the front of the slide abrasive , abrasive in front brick saws of the local area with several layers of debris piled in the back of abrasive due to the role of high-speed rotating grinding wheel , forming a vortex flow area, whirlpool area significantly reduced air pressure in the negative pressure , so that part of the debris attached to the back of the abrasive grains to form abrasive flank dependent clogging material is attached to the majority of ash and particles. Electrostatic field : the relative speed of the grinding wheel and the workpiece is much greater than V V sand workers, ordinary grinder V s = 3 ~ 50m / s, the speed of high-speed grinder grinding maturity value is 50 ~ 80 / s, foreign trials at speeds up to 1.5m / s or less 200m / s ~ 250m / s, the speed of the workpiece . When the grinding wheel and the work of the relative motion , arranged according to certain rules of the charge in the grinding area, due to the grinding wheel and the workpiece surface electron escape will cause. Meanwhile , the grinding gas high temperature region will result in the shock due to the discharge , so that the neutral abrasive flap wheels gas is ionized into positive ions and electrons. Some small areas in the grinding zone formed by a small electric field consists of the grinding wheel and the workpiece , the electric field , neutral atoms , positive ions, electrons , impurities, dust , not only the neutral atoms are ionized in the process , there are ion and electron recombination process. In the electric field , the polar part of the debris will be presented according to the principles of opposites attract , and the wheel opposite to the polarity of the debris is adsorbed on the surface of the grinding wheel . Since the electric field strength is small, so the adsorption force is weak, the wheel surface debris is not solid , but by means of mechanical pressure between the larger wheel and the workpiece, the wheel has been adsorbed on the surface of the wear debris can be stably embedded Wheel the gap between the surfaces . 2 ) blocking adhesion type mechanism : the majority of the grinding process of grinding the input power into heat, so that the grinding temperature up to 1200K or more points , in such a high temperature, rapid grinding of the first case of air circular blades oxidation , the formation of low melting point metal oxides, metal oxides followed by those in the grinding zone was heated to high temperatures melt state , covering the surface of the wheel , when this part of the surface of the grinding wheel on participation once again in the role of the grinding force , and some squeezed open , some enhancement, increased affinity and adhesion with the wheel , and the workpiece is pressed adhered to the surface of a groove surface of the ridge . Through multiple stochastic grinding , many abrasive debris adhering four weeks , the grinding force increases, the temperature rises , thereby forming a vicious cycle of increased congestion, or the abrasive grain broken off, which is melt adhesive .
2013年12月25日星期三
How to choose a good quality core drill
How to choose a good quality core drill ? Used magnetic drill drilling engineers may have distinct magnetic drill drilling speed really is not an ordinary hand drill comparison . Good times but the price is hollow drill twist drill head . So buy the right track to good hollow drill manufacturers consumption is very important. So what kind of Concrete saw blades hollow drill core drill is considered good ? How to choose a good quality core drill ?
I have talked to many customers about this topic. The answer generally have few , there is a trust -based client that is collaborative and after some suppliers will have great confidence in the products are supplied to provide a good product . We will also improve our quality selection system for customers good quality first hurdle ; Some customers are advocating brand type , or some kind of a common brand name products compared to agree , so the time of purchase , know or direct purchase of a certain category diamond blade saws of branded products, other brands of products to try ordinary little or rarely use . Such customers rarely have the opportunity general more suitable to my contacts , products are often cut in , it may be said that many customers will be repeated after it was selected choice of a particular brand of product , and continue to have a good use after the course Some big brand products are indeed the passing rate on the quality control and quality management is 4 inch saw blades very strict, so there is little "winning " situation attack. Another type of customer choice hollow drill bits, to simply learn to pragmatic type , I thought it only appropriate choice , either the price or quality , some brands may know very well , but the quality is not his only reason for choice .
I have talked to many customers about this topic. The answer generally have few , there is a trust -based client that is collaborative and after some suppliers will have great confidence in the products are supplied to provide a good product . We will also improve our quality selection system for customers good quality first hurdle ; Some customers are advocating brand type , or some kind of a common brand name products compared to agree , so the time of purchase , know or direct purchase of a certain category diamond blade saws of branded products, other brands of products to try ordinary little or rarely use . Such customers rarely have the opportunity general more suitable to my contacts , products are often cut in , it may be said that many customers will be repeated after it was selected choice of a particular brand of product , and continue to have a good use after the course Some big brand products are indeed the passing rate on the quality control and quality management is 4 inch saw blades very strict, so there is little "winning " situation attack. Another type of customer choice hollow drill bits, to simply learn to pragmatic type , I thought it only appropriate choice , either the price or quality , some brands may know very well , but the quality is not his only reason for choice .
2013年10月25日星期五
vitrified diamond wheel diamond and ceramic binder with common characteristics
Diamond grinding wheel is grinding carbide, glass, ceramics, precious stones high brittle materials effects tools. In recent years, with high-speed grinding ultra-precision grinding technology developed rapidly, put a higher demand on the grinding wheel, ceramic resin bonded grinding wheel has been unable to meet production needs, because of its combination dry core drill bits of metal bonded grinding wheel, high strength, good formability, long life and other significant characteristics of the production has been widely used. Metal bond diamond wheel manufacturers in different ways according to a major sintering, plating two types. In order to give full play to the role of super abrasive abroad from the 20th century, the early 90s with a high temperature brazing process to develop a new wheel, ie high temperature brazing monolayer superabrasive grinding wheels, this wheel is still in the current domestic research and development stage.
Ceramic diamond wheel vitrified diamond grinding wheel with diamond and vitrified common characteristics, and general corundum, silicon carbide grinding wheel compared to its grinding force, grinding temperature is relatively low, the wheel wear is relatively small; can be adapted diamond cup wheels to each species coolant effect; grinding wheel is good shape retention, high precision grind the workpiece; wheel has more pores, grinding and heat conducive chip, clogging, easy to burn the workpiece; wheel good self-sharpening, finishing a long time interval, trimming easier. Therefore, vitrified diamond grinding wheel used in some foreign countries is increasing.
Sintered diamond wheel
Sintered metal-bonded grinding wheels mostly bronze and other metals as a binder, with the manufacture of high-temperature sintering method, which combines high strength, good formability, high abrasive grinding wheels temperature, thermal conductivity, good wear resistance, long life, can withstand greater loads.
Electroplated diamond grinding wheel:
① plating process is simple, less investment, ease of manufacture;
② without dressing, easy to use;
③ monolayer structure determines it can reach very high operating speed, the current foreign countries have been as high as 250 ~ 300m / s;
④ Although only a single layer of diamond, but there is still enough life;
⑤ For high accuracy, roller wheels, electroplated unique manufacturing method. Precisely because of these advantages, plating wheel speed, ultra-high speed grinding occupy undisputed dominance.
Ceramic diamond wheel vitrified diamond grinding wheel with diamond and vitrified common characteristics, and general corundum, silicon carbide grinding wheel compared to its grinding force, grinding temperature is relatively low, the wheel wear is relatively small; can be adapted diamond cup wheels to each species coolant effect; grinding wheel is good shape retention, high precision grind the workpiece; wheel has more pores, grinding and heat conducive chip, clogging, easy to burn the workpiece; wheel good self-sharpening, finishing a long time interval, trimming easier. Therefore, vitrified diamond grinding wheel used in some foreign countries is increasing.
Sintered diamond wheel
Sintered metal-bonded grinding wheels mostly bronze and other metals as a binder, with the manufacture of high-temperature sintering method, which combines high strength, good formability, high abrasive grinding wheels temperature, thermal conductivity, good wear resistance, long life, can withstand greater loads.
Electroplated diamond grinding wheel:
① plating process is simple, less investment, ease of manufacture;
② without dressing, easy to use;
③ monolayer structure determines it can reach very high operating speed, the current foreign countries have been as high as 250 ~ 300m / s;
④ Although only a single layer of diamond, but there is still enough life;
⑤ For high accuracy, roller wheels, electroplated unique manufacturing method. Precisely because of these advantages, plating wheel speed, ultra-high speed grinding occupy undisputed dominance.
2013年10月24日星期四
Particularity blade coating material
Particularity blade coating material
Compared with the bulk material , the coating thickness is thin because it is easy to generate size effect , that cutting discs the coating thickness of the coating performance will be affected . Second , the coating with the volume ratio of the surface area is large, so the surface effect is significant , surface energy, surface state , surface scattering and surface interference great influence on its performance . In addition , the coating also contains a large number of grain boundaries and surface defect states , electrons have a greater impact during transport . Since the coating is a multi- grown deposited on the substrate , the substrate and the coating so that there is some interaction between such coating and the substrate appears and the adhesion between the adhesion problems , deposition coating layer will appear in the problem of internal stress , these problems are circular blades of the coating has a significant impact on performance .
Surface effect is obvious surface effect refers to the solid surface , the internal stress in the coating ; coating nano multilayer structure and nanocrystalline composite structure , the coating excellent overall performance: As a structural member of wear, corrosion , oxidation, and fatigue , cracks and other damage initiation process is started from the surface of the member , and therefore attached to the surface layer of the component , high strength, wear resistance , corrosion resistance, anti-oxidation coating , can inhibit or slow down the destruction process , reach protection purposes, and is still the core part component toughness to meet members and other requirements for stiffness , give full play to the coating and the wet saw blades substrate components excellent performance , thermal conductivity , sealing , excellent electrical conductivity of the coating, to meet and increasing component requirements for properties
Feed speed , depending on the processing of the material properties of each material when the cutting depth must have a certain range of the feed rate , if the speed is too high, will accelerate the wear of diamond or even fall off , causing the blade consumed quickly If the speed is too low , then they will make the process of self-sharpening blades can not be normal , so " blunt , skid " lost cutting capacity . Under normal circumstances , the feed speed is slower when cutting , sawing should be in uniform for the common typical materials , when the cutting depth is 20mm, recommend the following feed rate table for your reference , when the thickness changes, the cutting speed can be press the cutting area (cm2 / min) to conversion . Tip: The first feed or each piece of board should be reduced by half for the first three walks .
Compared with the bulk material , the coating thickness is thin because it is easy to generate size effect , that cutting discs the coating thickness of the coating performance will be affected . Second , the coating with the volume ratio of the surface area is large, so the surface effect is significant , surface energy, surface state , surface scattering and surface interference great influence on its performance . In addition , the coating also contains a large number of grain boundaries and surface defect states , electrons have a greater impact during transport . Since the coating is a multi- grown deposited on the substrate , the substrate and the coating so that there is some interaction between such coating and the substrate appears and the adhesion between the adhesion problems , deposition coating layer will appear in the problem of internal stress , these problems are circular blades of the coating has a significant impact on performance .
Surface effect is obvious surface effect refers to the solid surface , the internal stress in the coating ; coating nano multilayer structure and nanocrystalline composite structure , the coating excellent overall performance: As a structural member of wear, corrosion , oxidation, and fatigue , cracks and other damage initiation process is started from the surface of the member , and therefore attached to the surface layer of the component , high strength, wear resistance , corrosion resistance, anti-oxidation coating , can inhibit or slow down the destruction process , reach protection purposes, and is still the core part component toughness to meet members and other requirements for stiffness , give full play to the coating and the wet saw blades substrate components excellent performance , thermal conductivity , sealing , excellent electrical conductivity of the coating, to meet and increasing component requirements for properties
Feed speed , depending on the processing of the material properties of each material when the cutting depth must have a certain range of the feed rate , if the speed is too high, will accelerate the wear of diamond or even fall off , causing the blade consumed quickly If the speed is too low , then they will make the process of self-sharpening blades can not be normal , so " blunt , skid " lost cutting capacity . Under normal circumstances , the feed speed is slower when cutting , sawing should be in uniform for the common typical materials , when the cutting depth is 20mm, recommend the following feed rate table for your reference , when the thickness changes, the cutting speed can be press the cutting area (cm2 / min) to conversion . Tip: The first feed or each piece of board should be reduced by half for the first three walks .
2013年9月22日星期日
single crystal diamond tool application
a single diamond crystal, the crystal structure of the highest density of metal atom such as axial face-centered cubic crystal. Diamond crystal connected between the carbon atoms bond to sp3 hybridized covalent bond, with a strong binding force, stability and direction. The wet
polishing pad unique crystal structure of diamond in nature it has the highest hardness, stiffness, refractive index and thermal conductivity, and high wear resistance, corrosion resistance and chemical stability.
Excellent characteristics of single crystal diamond meet the precision and ultra-precision cutting tool material for most of the requirements and is ideal for precision cutting tool materials. Diamond without internal grain boundaries uniform crystal structure so that the tool cutting edge can theoretically reach the atomic level flatness and sharpness, cut thin cutting ability, high precision, cutting force is small; their diamond tool manufacturer high hardness and good wear resistance resistance, corrosion resistance and chemical stability can ensure that the tool has a long life, so that it can continue for a long time of cutting, the tool wear can be reduced because of the precision of the parts; its high thermal conductivity can be reduced and the cutting temperature parts thermal deformation.
Single crystal diamond tool in the machining field has an important position, is widely used as a mirror, missiles and rockets navigation gyro, computer hard disk substrate accelerator electron gun, such as ultra hole saw blades precision mirror of parts. Can also be used in the manufacture of single crystal diamond eye, brain surgeon's scalpel, thin slicing knives and other bio-medical tools. In addition, single-crystal diamond tool in civilian products processing applications are becoming increasingly widespread, from watch parts, aluminum pistons, jewelry and other processing to pens, high-gloss mirror decorative signs and non-ferrous metal parts processing, its application has entered the machining a variety of areas.
This article focuses on the design principles of the single crystal diamond tool and the use of technology.
Excellent characteristics of single crystal diamond meet the precision and ultra-precision cutting tool material for most of the requirements and is ideal for precision cutting tool materials. Diamond without internal grain boundaries uniform crystal structure so that the tool cutting edge can theoretically reach the atomic level flatness and sharpness, cut thin cutting ability, high precision, cutting force is small; their diamond tool manufacturer high hardness and good wear resistance resistance, corrosion resistance and chemical stability can ensure that the tool has a long life, so that it can continue for a long time of cutting, the tool wear can be reduced because of the precision of the parts; its high thermal conductivity can be reduced and the cutting temperature parts thermal deformation.
Single crystal diamond tool in the machining field has an important position, is widely used as a mirror, missiles and rockets navigation gyro, computer hard disk substrate accelerator electron gun, such as ultra hole saw blades precision mirror of parts. Can also be used in the manufacture of single crystal diamond eye, brain surgeon's scalpel, thin slicing knives and other bio-medical tools. In addition, single-crystal diamond tool in civilian products processing applications are becoming increasingly widespread, from watch parts, aluminum pistons, jewelry and other processing to pens, high-gloss mirror decorative signs and non-ferrous metal parts processing, its application has entered the machining a variety of areas.
This article focuses on the design principles of the single crystal diamond tool and the use of technology.
2013年9月21日星期六
How emery cloth sandpaper belt reel made
Industrial most sandpaper belt sandpaper belt abrasive cloth roll , abrasive belt is a high hardness and mechanical strength of a particulate material, which is directly used for the manufacture of abrasive or grinding and polishing as a sandpaper sand with emery cloth roll cutting discs must have the basic features , in general, should meet the following five requirements :
Sandpaper belt abrasive cloth roll hardness must be higher than the hardness of the object to be processed , otherwise , can not be achieved grinding requirements. Modest crush resistance and self -sharpening sandpaper belt abrasive cloth roll have appropriate crush resistance and self-sharpening sex , during grinding , abrasive order love with a compressive, flexural , impact and other stresses , such as its crush resistance is too low, grinding abrasive quickly broken , it is difficult for effective grinding : on the contrary , after blunt abrasive nor broken, not a new blade , so that the grinding unable to proceed, therefore , requires grit blunt after grinding under stress , self- broken, exposing new sharp blade , the grinding process continues . 3 . Sandpaper belt abrasive cloth roll should have good thermal stability
Grinding work, often produce large amounts of heat , high temperatures can be achieved locally as a sandpaper belt abrasive cloth roll at high temperature should be able to maintain a certain hardness and strength , for example, the highest temperature hardness of diamond , but more than 800 ℃ will be carbonized into graphite, the sharp decline in hardness and tile cutting blades strength , which to a certain extent, limit the application of diamond .
4 . Sandpaper belt abrasive cloth roll should have a certain chemical stability c9T Huizhou HTC grinding plant material
Sandpaper belt abrasive cloth roll with the object to be processed is not easy to produce a chemical reaction . Term practice has shown that the grinding is not a simple mechanical process in which the presence of certain chemical reactions , such as silicon carbide sandpaper belt abrasive cloth roll steel processing occurs when following reaction : SiC ( solid ) +4 Fe ( liquid ) → FeSi ( solid ) + Fe3C ( solid) as sandpaper belt abrasive cloth roll and being the processing target a chemical reaction, the abrasive sandpaper belt inherent mechanical properties of the volume change, which affecting the grinding effect .
5 . Ease of processing into particles of different sizes is the use of the abrasive grinding surface composed of many particles to carry out the cutting edge , so the process should sandpaper belt abrasive cloth roll to the desired particle size . Some substances , such as tamping rammer cemented carbide Although high hardness, but because of its toughness is large, compared with sandpaper belt abrasive cloth roll is difficult processed into granules, therefore , not suitable for manufacturing emery cloth sandpaper belt reel .
Sandpaper belt abrasive cloth roll hardness must be higher than the hardness of the object to be processed , otherwise , can not be achieved grinding requirements. Modest crush resistance and self -sharpening sandpaper belt abrasive cloth roll have appropriate crush resistance and self-sharpening sex , during grinding , abrasive order love with a compressive, flexural , impact and other stresses , such as its crush resistance is too low, grinding abrasive quickly broken , it is difficult for effective grinding : on the contrary , after blunt abrasive nor broken, not a new blade , so that the grinding unable to proceed, therefore , requires grit blunt after grinding under stress , self- broken, exposing new sharp blade , the grinding process continues . 3 . Sandpaper belt abrasive cloth roll should have good thermal stability
Grinding work, often produce large amounts of heat , high temperatures can be achieved locally as a sandpaper belt abrasive cloth roll at high temperature should be able to maintain a certain hardness and strength , for example, the highest temperature hardness of diamond , but more than 800 ℃ will be carbonized into graphite, the sharp decline in hardness and tile cutting blades strength , which to a certain extent, limit the application of diamond .
4 . Sandpaper belt abrasive cloth roll should have a certain chemical stability c9T Huizhou HTC grinding plant material
Sandpaper belt abrasive cloth roll with the object to be processed is not easy to produce a chemical reaction . Term practice has shown that the grinding is not a simple mechanical process in which the presence of certain chemical reactions , such as silicon carbide sandpaper belt abrasive cloth roll steel processing occurs when following reaction : SiC ( solid ) +4 Fe ( liquid ) → FeSi ( solid ) + Fe3C ( solid) as sandpaper belt abrasive cloth roll and being the processing target a chemical reaction, the abrasive sandpaper belt inherent mechanical properties of the volume change, which affecting the grinding effect .
5 . Ease of processing into particles of different sizes is the use of the abrasive grinding surface composed of many particles to carry out the cutting edge , so the process should sandpaper belt abrasive cloth roll to the desired particle size . Some substances , such as tamping rammer cemented carbide Although high hardness, but because of its toughness is large, compared with sandpaper belt abrasive cloth roll is difficult processed into granules, therefore , not suitable for manufacturing emery cloth sandpaper belt reel .
2013年9月10日星期二
diamond tool chucking three ways
We all know that a diamond tool chucking quality directly affects the performance of diamond tools , diamond tools described below under three chucking method:
1 bonding method
Epoxy adhesive used is an organic binder such as gum or 502 will be bonded diamond blade arbor wet diamond polishing pads with diamond segments to match the size of the groove. This method is simple , does not require special equipment and fixtures, get a certain bond strength . When the tool requires grinding , you need to first bond with a solvent such as acetone gel open , right diamond blade for grinding and re- bonded to the arbor . In addition, diamond blade bonding process is more difficult to ensure positional accuracy .
(2) Setting
Mosaic Law is the first diamond blade with sintered metal powder together , then head through the diamond plate mechanically fixed to the arbor .
3 Brazing Method
By brazing method directly welded diamond cutting tool has been a popular concern. Since diamond has a high chemical stability , it is difficult chemical reaction with other metals, and the welding , therefore , to reliably achieve the diamond is firmly connected with the metal , a diamond tool manufacturing technology solved difficulties and 4 inch saw blades research.
diamond wheel safekeepingDiamond grinding wheel has a unique performance characteristics, we should also be stored in the custody properly , let's take a look at the diamond grinding wheel should be stored at :
Do not contact with corrosive gases and liquids , especially resin bond diamond grinding wheel, resin contact with corrosive chemicals cause the performance change.
Diamond grinding wheel in the handling storage, be careful not to collide , resin bonded grinding wheel and ceramic bonded grinding wheel after a collision prone gap, rupture.
Do not use the diamond wheel into , they should immediately wash the coolant to keep the wheel surface clean to prevent further oil coolant inside wheel , causing the wheel again when the imbalance .
Try stored at room concrete diamond blades temperature, diamond grinding wheel , avoid contact with high temperature or low temperature .
Due to the effects of aging resin , resin diamond wheels generally do not exceed one year shelf life , otherwise , it will affect the normal use. If you must use , must then be related to safety testing .
1 bonding method
Epoxy adhesive used is an organic binder such as gum or 502 will be bonded diamond blade arbor wet diamond polishing pads with diamond segments to match the size of the groove. This method is simple , does not require special equipment and fixtures, get a certain bond strength . When the tool requires grinding , you need to first bond with a solvent such as acetone gel open , right diamond blade for grinding and re- bonded to the arbor . In addition, diamond blade bonding process is more difficult to ensure positional accuracy .
(2) Setting
Mosaic Law is the first diamond blade with sintered metal powder together , then head through the diamond plate mechanically fixed to the arbor .
3 Brazing Method
By brazing method directly welded diamond cutting tool has been a popular concern. Since diamond has a high chemical stability , it is difficult chemical reaction with other metals, and the welding , therefore , to reliably achieve the diamond is firmly connected with the metal , a diamond tool manufacturing technology solved difficulties and 4 inch saw blades research.
diamond wheel safekeepingDiamond grinding wheel has a unique performance characteristics, we should also be stored in the custody properly , let's take a look at the diamond grinding wheel should be stored at :
Do not contact with corrosive gases and liquids , especially resin bond diamond grinding wheel, resin contact with corrosive chemicals cause the performance change.
Diamond grinding wheel in the handling storage, be careful not to collide , resin bonded grinding wheel and ceramic bonded grinding wheel after a collision prone gap, rupture.
Do not use the diamond wheel into , they should immediately wash the coolant to keep the wheel surface clean to prevent further oil coolant inside wheel , causing the wheel again when the imbalance .
Try stored at room concrete diamond blades temperature, diamond grinding wheel , avoid contact with high temperature or low temperature .
Due to the effects of aging resin , resin diamond wheels generally do not exceed one year shelf life , otherwise , it will affect the normal use. If you must use , must then be related to safety testing .
2013年8月18日星期日
diamond tool can process high hardness work
High hardness of diamond tool can process work:
PCD, PCBN two kinds of superhard material tools covering most machinable materials with high hardness cutting fields. PCD tool allows the surface roughness of Ra1.6-Ra0.16; PCBN cutting tool surface roughness can reach Ra1.6-Ra0.3. Machining, especially metal cutting process many occasions to turning, boring, milling instead of grinding process, so that the power trowel product parts simplify the structure, size, high precision, shape and position error is small, the production efficiency. Since turning, boring, milling cutter with compression of the carbide drill bits workpiece to be machined parts of the surface compressive stress after processing was like, help to improve the quality of product parts.
Dimensionally stable parts to be processed:
As superhard material tools high wear resistance, its life is much higher than carbide tools, parts to be machined dimensional stability, low cost production site quality management. Small pieces, a large number of the production process, tooling parts superhard material process capability index is high and stable, can greatly reduce the sampling frequency. Large small batch production process, large parts of the finished surface size consistency, shape, small error, can reduce the test items. Products, defective products, inspection fees are decreased substantially.
Comprehensive economic efficiency:
1, due to the frequency and masonry drill bits duration to reduce downtime, increase production throughput, decrease the number of waste products.
2, the use of equipment, electricity, labor costs and lower management fees.
3, PCBN and PCD tools in a suitable occasion, simply use the appropriate one-piece machining products are generally lower than the total cost of additional tooling costs.
PCD, PCBN two kinds of superhard material tools covering most machinable materials with high hardness cutting fields. PCD tool allows the surface roughness of Ra1.6-Ra0.16; PCBN cutting tool surface roughness can reach Ra1.6-Ra0.3. Machining, especially metal cutting process many occasions to turning, boring, milling instead of grinding process, so that the power trowel product parts simplify the structure, size, high precision, shape and position error is small, the production efficiency. Since turning, boring, milling cutter with compression of the carbide drill bits workpiece to be machined parts of the surface compressive stress after processing was like, help to improve the quality of product parts.
Dimensionally stable parts to be processed:
As superhard material tools high wear resistance, its life is much higher than carbide tools, parts to be machined dimensional stability, low cost production site quality management. Small pieces, a large number of the production process, tooling parts superhard material process capability index is high and stable, can greatly reduce the sampling frequency. Large small batch production process, large parts of the finished surface size consistency, shape, small error, can reduce the test items. Products, defective products, inspection fees are decreased substantially.
Comprehensive economic efficiency:
1, due to the frequency and masonry drill bits duration to reduce downtime, increase production throughput, decrease the number of waste products.
2, the use of equipment, electricity, labor costs and lower management fees.
3, PCBN and PCD tools in a suitable occasion, simply use the appropriate one-piece machining products are generally lower than the total cost of additional tooling costs.
2013年8月15日星期四
A new high-speed hacksaw trials
In order to extend the service life of the metal circular sawing machine with the new HSS film (new unused HSS film or after each grinding HSS film) has a running-in process more fully in the cutting operation begins within 10 minutes, reducing the feed rate is very necessary.
2, the cutting speed and feed
Cutting speed depends on the cross-section of the workpiece to be cut and toughness. For such a hard cutting discs cutting stainless steel, high toughness materials, a slower speed is very conducive to improving the life of HSS film; while for some iron and the like, relatively low toughness materials, high-speed hacksaw speed can be increased accordingly.
3, timely and correct grinding HSS film
Pay attention to the HSS film work, the occurrence of abnormalities such as vibration, my voice, machined surface material moving situation, you must promptly stop adjustment, and cutting blades timely grinding, maintaining peak profits. Timely and proper re-grinding HSS film can play a high-speed hacksaw maximum performance.
4, adding a suitable cooling liquid
Because when the heat generated by the cutting, it may cause HSS film deformation, no coolant, not only affect the speed hacksaw life, but cutting effect is not ideal. So please join coolant.
5, observe sawdust determine the concrete saws effectiveness of the current high-speed hacksaw state
1) is very fine sawdust or powdered, which means cutting pressure is too small
2) of a soft sawdust, which means overload cut
3) sawdust as long spiral filaments, which means that in good condition
4) If the increase in feed rate, the corresponding number of teeth should be selected coarse
2, the cutting speed and feed
Cutting speed depends on the cross-section of the workpiece to be cut and toughness. For such a hard cutting discs cutting stainless steel, high toughness materials, a slower speed is very conducive to improving the life of HSS film; while for some iron and the like, relatively low toughness materials, high-speed hacksaw speed can be increased accordingly.
3, timely and correct grinding HSS film
Pay attention to the HSS film work, the occurrence of abnormalities such as vibration, my voice, machined surface material moving situation, you must promptly stop adjustment, and cutting blades timely grinding, maintaining peak profits. Timely and proper re-grinding HSS film can play a high-speed hacksaw maximum performance.
4, adding a suitable cooling liquid
Because when the heat generated by the cutting, it may cause HSS film deformation, no coolant, not only affect the speed hacksaw life, but cutting effect is not ideal. So please join coolant.
5, observe sawdust determine the concrete saws effectiveness of the current high-speed hacksaw state
1) is very fine sawdust or powdered, which means cutting pressure is too small
2) of a soft sawdust, which means overload cut
3) sawdust as long spiral filaments, which means that in good condition
4) If the increase in feed rate, the corresponding number of teeth should be selected coarse
2013年8月14日星期三
Use of bit and description
Bit is used to drill out the solid material through holes or blind holes, and is able to have a hole reaming tools. Twist drills are commonly used, flat drill, center drill, deep hole drilling and core drill. Reamers and countersinks although not drill holes in solid material, but will also be used to drill them into a class.
Twist drill
Twist drill through its axis fixed relative to the rotary cutting tool for drilling a workpiece hole. Its flute and shape into a spiral twist named. Spiral chute slot 2 slots 3 slots or more, but the diamond bandsaw blades most common slot 2. Twist can be held in manual, electric handheld drill tools or drilling machines, milling machines, lathes and even use on machining centers. Drill material is generally high-speed tool steel or carbide.
Twist is the most widely-hole machining tool. Diameter range of usually 0.25 to 80 mm. It is mainly the working portion and the shank portion. Working part has two spiral grooves, the shape of cannabis, hence the name. In order to reduce drilling holes intramural guide portion and the friction, twist drill tip to the shank from the direction of decreasing diameter inverted cone. Helix angle of twist drill cutting edge came principally affected the size of angles, edge flap strength and chip performance, typically 25 ° ~ 32 °. Available spiral groove milling, grinding, hot-rolled or hot extrusion processing methods, the drill bit tip is formed by grinding after the cutting portion. Standard twist angle of the cutting portion 118, a horizontal blade angle is 40 ° ~ 60 °, after the angle of 8 ° ~ 20 °. For structural reasons, a large rake angle in the outer edge, and gradually decreases toward the center, horizontal blade at a negative rake angle (up to about -55 °), when drilling from the compression. In order to improve the cutting performance of twist drills, according to the nature of the material to be machined part will repair ground cutting various shapes (such as drilling group). Form of shank twist drill straight shank and taper shank are two processing caught in the drill chuck the former, the latter inserted in the machine spindle or tailstock taper hole. Generally high-speed steel twist drill. Inserts welded carbide blade or twist the crown for machining cast iron, hardened steel and non-metallic materials, solid carbide twist drills for machining small parts and printed circuit boards and other instrumentation.
Cutting portion of the drill flat spade, simple structure, low cost, easily cutting fluid into the hole, but the cutting and chip performance is poor. Flat structure integral drill and assembly two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores. Fabricated flat diamond blade can be changed, can be cooled, mainly for the drilling diameter 25 to 500 mm large hole.
Deep hole drilling is typically the hole saw blades machining hole depth is greater than the diameter of the bore of the tool 6. Commonly used gun drilling, BTA deep hole drilling, jet drill, DF deep hole drilling. Nesting also used in drilling deep holes.
Reamer has three to four teeth, better rigidity than the twist, to expand the existing hole and improve the machining accuracy and finish.
Countersinks have more teeth to the end of the hole forming method processed into the desired shape, for processing a variety of countersunk head screws countersunk holes, holes or flattened outer end face.
Center drill for drilling holes shaft center of the workpiece, it is essentially a small twist by the helix angle and tct circular saw blade countersink drill composite, so called composite center drill.
Center drill
Prefabricated hole machining for precise positioning guide twist drill hole processing, reduce errors.
Center drill is used in other parts of the end face of the shaft center hole machining.
The product is easy-cutting, chip is good. There are two kinds of center drill type: A type: without protecting chamfers center drill, B: with protecting chamfers center drill, machining diameter d = 1 ~ 10mm center hole, usually without protective dimensional center drill ( A type); step long high precision of the workpiece, the centering cone 60 degrees in order to avoid being damaged, the general center of the cone with a protective cone
Twist drill
Twist drill through its axis fixed relative to the rotary cutting tool for drilling a workpiece hole. Its flute and shape into a spiral twist named. Spiral chute slot 2 slots 3 slots or more, but the diamond bandsaw blades most common slot 2. Twist can be held in manual, electric handheld drill tools or drilling machines, milling machines, lathes and even use on machining centers. Drill material is generally high-speed tool steel or carbide.
Twist is the most widely-hole machining tool. Diameter range of usually 0.25 to 80 mm. It is mainly the working portion and the shank portion. Working part has two spiral grooves, the shape of cannabis, hence the name. In order to reduce drilling holes intramural guide portion and the friction, twist drill tip to the shank from the direction of decreasing diameter inverted cone. Helix angle of twist drill cutting edge came principally affected the size of angles, edge flap strength and chip performance, typically 25 ° ~ 32 °. Available spiral groove milling, grinding, hot-rolled or hot extrusion processing methods, the drill bit tip is formed by grinding after the cutting portion. Standard twist angle of the cutting portion 118, a horizontal blade angle is 40 ° ~ 60 °, after the angle of 8 ° ~ 20 °. For structural reasons, a large rake angle in the outer edge, and gradually decreases toward the center, horizontal blade at a negative rake angle (up to about -55 °), when drilling from the compression. In order to improve the cutting performance of twist drills, according to the nature of the material to be machined part will repair ground cutting various shapes (such as drilling group). Form of shank twist drill straight shank and taper shank are two processing caught in the drill chuck the former, the latter inserted in the machine spindle or tailstock taper hole. Generally high-speed steel twist drill. Inserts welded carbide blade or twist the crown for machining cast iron, hardened steel and non-metallic materials, solid carbide twist drills for machining small parts and printed circuit boards and other instrumentation.
Cutting portion of the drill flat spade, simple structure, low cost, easily cutting fluid into the hole, but the cutting and chip performance is poor. Flat structure integral drill and assembly two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores. Fabricated flat diamond blade can be changed, can be cooled, mainly for the drilling diameter 25 to 500 mm large hole.
Deep hole drilling is typically the hole saw blades machining hole depth is greater than the diameter of the bore of the tool 6. Commonly used gun drilling, BTA deep hole drilling, jet drill, DF deep hole drilling. Nesting also used in drilling deep holes.
Reamer has three to four teeth, better rigidity than the twist, to expand the existing hole and improve the machining accuracy and finish.
Countersinks have more teeth to the end of the hole forming method processed into the desired shape, for processing a variety of countersunk head screws countersunk holes, holes or flattened outer end face.
Center drill for drilling holes shaft center of the workpiece, it is essentially a small twist by the helix angle and tct circular saw blade countersink drill composite, so called composite center drill.
Center drill
Prefabricated hole machining for precise positioning guide twist drill hole processing, reduce errors.
Center drill is used in other parts of the end face of the shaft center hole machining.
The product is easy-cutting, chip is good. There are two kinds of center drill type: A type: without protecting chamfers center drill, B: with protecting chamfers center drill, machining diameter d = 1 ~ 10mm center hole, usually without protective dimensional center drill ( A type); step long high precision of the workpiece, the centering cone 60 degrees in order to avoid being damaged, the general center of the cone with a protective cone
2013年8月12日星期一
PCB drilling with a drill
The so-called carbide to tungsten carbide face as the substrate, cobalt powder as a binder by pressing and sintering. High precision positioning, do not causative drill sleeve. But the toughness is poor, very brittle, in order to improve the performance of cemented carbide, and some use carbide substrate in a chemical vapor deposition on a layer of 5-7 micron titanium carbide special hardware (TIC) or titanium nitride (TIN), to have a higher hardness. Carbide drill ultra fine particles, which equality of tungsten carbide grain size of the phase 1 micron or less. To save costs using welding shank drill now better structure, the original carbide drill bit for the wet diamond polishing pads group are now back with a stainless steel drill shank, cost greatly diminished, but not the same as the material used and its dynamic concentricity than but groups carbide drill, surprisingly in the small diameter side. In the range of the flute length, diameter of the drill is an inverted cone, with the hole when drilling wall friction is small, high quality drilling. In the actual causative process can be based on the need to use. This drill is not only high hardness and compressive and flexural strength are increased. There's a physical way to the top of the drill generate a diamond film, a great increase of hardness and wear resistance of the drill. Some of the ion infusion techniques, titanium, nitrogen, and carbon, the matrix perfusion certain depth, Bu Wei and increase the hardness and strength of the drill components Regrinding can move into the perfusion. Large helix angle, chip speed, suitable for high-speed grinding. Because of its hardness, slender, very wearable, a certain strength, suitable for high-speed grinding. Straight shank twist drill mostly for single head machines, PCB drilling relatively simple or single panel, now in a large circuit board manufacturing plant has been rarely seen, its drilling depth of up to 10 times the diameter of the drill.
1, to choose a good brand guarantee product quality
PCB drilling with a drill ordinary carbide are used as carbide drill bits ring oxygen glass cloth complex copper plate wear on cutting surprisingly fast. Common drill shank diameter of 3.00mm and 3.175mm. Most of the manufacturers causative holds many lessons for digital control drilling machine, numerical control drilling causative is fixed shank carbide drill bit, which is characterized by semi-automatic Gaiyi drill can be implemented. Usually with WC 94 one hundred percent, one hundred percent cobalt 6. Holds many lessons, many drill manufacturers, sub-national and imported.
2, pay attention to the material of drill
PCB drilling with a drill with straight shank twist drill, twist drill set and fixed shank shank Spade (undercut) drill bit.
Optional digital control drilling drill approach:
3, to understand the drill category and characteristics.
Domestic products and foreign products dwarf slight gap between the price of course, but also slightly more expensive imports, the market also has production from Taiwan and Hong Kong, as well as part of the production in Taiwan to fight the U.S. and European brands of drills, contrast causative Europe, America and Japan the quality and stability of the concrete cutting drill imports, although the price is slightly expensive but good value for money for the craft members who, in the course of the actual causative drill quality problems that occur because of a handful of chances, such as the production of products require a higher import causative proposed drill, drill Europe and America high hardness and Japan softer, Europe drill rather break than bend causative of migraine-prone holes but could not help but break the higher the probability that Japan is better flexibility drill holes prone to easy to break, but missed the odd side is a small drill hole. Carbide hardness and strength, not only the ratio of cobalt and tungsten carbide and related particles are also associated with the face. Laminated substrate is not high in the case, causative drill sleeve can avoid drilling biased.
1, to choose a good brand guarantee product quality
PCB drilling with a drill ordinary carbide are used as carbide drill bits ring oxygen glass cloth complex copper plate wear on cutting surprisingly fast. Common drill shank diameter of 3.00mm and 3.175mm. Most of the manufacturers causative holds many lessons for digital control drilling machine, numerical control drilling causative is fixed shank carbide drill bit, which is characterized by semi-automatic Gaiyi drill can be implemented. Usually with WC 94 one hundred percent, one hundred percent cobalt 6. Holds many lessons, many drill manufacturers, sub-national and imported.
2, pay attention to the material of drill
PCB drilling with a drill with straight shank twist drill, twist drill set and fixed shank shank Spade (undercut) drill bit.
Optional digital control drilling drill approach:
3, to understand the drill category and characteristics.
Domestic products and foreign products dwarf slight gap between the price of course, but also slightly more expensive imports, the market also has production from Taiwan and Hong Kong, as well as part of the production in Taiwan to fight the U.S. and European brands of drills, contrast causative Europe, America and Japan the quality and stability of the concrete cutting drill imports, although the price is slightly expensive but good value for money for the craft members who, in the course of the actual causative drill quality problems that occur because of a handful of chances, such as the production of products require a higher import causative proposed drill, drill Europe and America high hardness and Japan softer, Europe drill rather break than bend causative of migraine-prone holes but could not help but break the higher the probability that Japan is better flexibility drill holes prone to easy to break, but missed the odd side is a small drill hole. Carbide hardness and strength, not only the ratio of cobalt and tungsten carbide and related particles are also associated with the face. Laminated substrate is not high in the case, causative drill sleeve can avoid drilling biased.
2013年8月11日星期日
Introduce common drill
Twist is the most widely-hole machining tool. Diameter range of usually 0.25 to 80 mm. It is mainly the working portion and the shank by the drill portion. Working part has two spiral grooves, the industrial saw blades shape of cannabis, hence the name. In order to reduce drilling holes intramural guide portion and the friction, twist drill tip to the shank from the direction of decreasing diameter inverted cone. Helix angle of twist drill cutting edge came principally affected the size of angles, edge flap strength and chip performance, typically 25 ° ~ 32 °. Available spiral groove milling, grinding, hot-rolled or hot extrusion processing methods, the drill bit tip is formed by grinding after the cutting portion. Standard twist angle of the cutting portion 118, a horizontal blade angle is 40 ° ~ 60 °, after the angle of 8 ° ~ 20 °. For structural reasons, a large rake angle in the outer edge, and gradually decreases toward the center, horizontal blade at a negative rake angle (up to about -55 °), when drilling from the compression. In order to improve the cutting performance of twist drills, according to the nature of the material to be machined part will repair ground cutting various shapes (such as drilling group). Form of shank twist drill straight shank and taper shank are two processing caught in the drill chuck the former, the latter inserted in the machine spindle or tailstock taper hole. Generally high-speed steel twist drill. Inserts welded carbide blade or twist the crown for machining cast iron, hardened steel and non-metallic materials, solid carbide twist drills for machining small parts and printed circuit boards and other instrumentation.
Flat drill
Cutting portion of the drill flat spade, simple structure, low cost, easily cutting fluid into the hole, but the cutting and chip performance is poor. Flat structure integral drill and assembly two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores. Fabricated flat diamond blade can be changed, can be cooled, mainly for the drilling diameter 25 to 500 mm large hole.
Deep hole drilling
Deep hole drilling is typically the machining hole depth is greater than the diameter of the bore of the tool 6. Commonly used gun drilling, BTA deep hole drilling, jet drill, DF deep hole drilling. Nesting also used in drilling deep holes.
Reamer
Reamer has three to four teeth, better rigidity than the twist, to expand the existing hole and improve the machining accuracy and finish.
Countersink
Countersinks have more teeth to the end of the hole forming method processed into the desired shape, for processing a variety of countersunk head screws countersunk holes, holes or flattened outer end face.
Center drill
Center drill for drilling holes shaft center of the diamond bandsaw blades workpiece, it is essentially a small twist by the helix angle and countersink drill composite, so called composite center drill.
Bit Structure
A drill, comprising a shank (1), a tip shank, the tip has two in a main plane (C-C) on the cutting insert (5,5 '), said cutting blade (5,5 ') having a second common plane (E-E) is oriented to the center of the short cutting edges. Said blade forms a point-like central cutting edges used to enter the workpiece, and thus the bit pair. In the arbor, the establishment of two flutes (6,6 '), the flute (6,6') extending from the tip end in the end. Any length along the surface of the arbor, the flutes are in the plane of the tube diametrically opposite positions to each other, the tube plane of the two sides of the tube with a common edge with a flat blade (F-F) to 90 ° extends in the plane of the shank has a maximum rigidity. Center cutting edge of the second plane (E-E) in alignment with the blade shank with a flat bottom or main rigidity direction (F-F) at approximately a 90 ° angle.
One kind of concrete, etc. in drilling operations, drilling state can ease the situation suddenly changed, so that drilling operations stable, even in large grain chips produced when drilling efficiency is not caused by lowering of the drill.
Configuration which substantially radial cutting edge portion having at least two main cutting edge portion, and arranged in the circumferential direction of said main cutting edge portion and between the main cutting edge portion, at least two sub cutting blade portion said main cutting edge portion includes a main cutting edge as the cutting blade, the cutting blade inner end of the main center of rotation, the outer end of the cutting edge portion in the outer periphery of the rotation locus.
A cutting edge portion of the sub cutting blade as the sub cutting blade, the sub cutting blade inner end is located off the center of rotation to the outer side of the site, the outer end is located in the rotating cutting blade portion deviated from the center of rotation locus of the outer edge position.
A drill, with a drill tip disposed on the plurality of cutting blade portion, and provided on the base end side of the cutting blade portion and the base end portion of the shank portion is formed with a shaft-shaped drill main body;
Said cutting blade portion has a flank of the cutting surface and the engagement surface protruding toward the front end edge of the cutting edge formed by said center of rotation of the cutting blade from the drill side arranged substantially radially outer side;
The rotary axis of the direction of movement and the operation of the impact operation of cutting the composite, characterized in that said cutting blade portion has at least two main cutting edge portion, and disposed in the circumferential direction of the ring saw blades main cutting edge portion and the main cutting between the blade, at least two sub cutting blade portion;
The main cutting edge portion having a cutting edge as a main cutting edge, an inner end of said main cutting edge is located in the center of rotation, the outer end of the cutting edge portion in the outer periphery of the rotation locus, the sub cutting blade portion having as its the sub cutting blade cutting edge, the secondary cutting blade inner end is located radially outwardly from the rotation center deviate from the site, the outer end portion in the rotation from the cutting edge to the center of rotation locus of the outer side of the deviated position.
PDC bits
PDC bits [1] for short. Is commonly used in the oil drilling industry as a drilling tool.
PDC continuous improvement of product performance
In the past few years, PDC cutter quality and type have undergone tremendous changes. If the teeth of the 1980s to today's teeth for comparison, the difference is quite large. Because hybrid technology and manufacturing process changes, today's cutting teeth is much better quality and performance, so that the anti-erosion and impact drill capabilities are greatly improved.
Engineers also tungsten carbide substrate and the interface between the diamond has been optimized to improve the toughness of the cutting teeth. Process innovations in the diamond layer is also used to improve the abrasion resistance and thermal stability.
In addition to material and manufacturing process developments outside, PDC products in the tooth tooth design techniques and fabric also achieved a major breakthrough. Now, PDC products have been used previously can not be applied in areas such as stiffer, stronger and changing abrasive formations. This extension to new areas, the diamond (fixed cutter) cone drill bit and the balance between a great impact.
Initially, PDC drill bit can only be used for soft shale formations, the reason is hard mezzanine will damage the drill bit. However, due to the emergence of new technologies and changes in the structure, the current PDC drill bit for drilling hard interlayer has been able to and a long section of the hard rock formations. PDC bits are increasingly being used by people, especially with the continuous improvement of quality PDC teeth, in which case more and more prominent.
Since teeth bit design and improvement, PDC drill bit orientability also will increase, which further weakened the past in motor drilling cone bit advantage. Currently, PDC drill every day in many applications where the drilling supplant cone drill bit market.
Commonly used mechanical drills, twist drills with straight shank (ordinary type), you can drill: 45 # steel, stainless steel, diamond hardness using the weak point of the material. Alloy drill, you can drill Cr12 steel, the use of diamond hardness strong material. Use drill expertise can allow himself to lower profits.
PCB Drill Type
PCB drill drill drill control Type: PCB drilling with a drill with straight shank twist drill, fixed and fixed shank twist drill shank Spade (undercut) drill bit. Straight shank twist drill mostly for single head machines, PCB drilling relatively simple or single panel, now in a large circuit board manufacturing plant has been rarely seen in its drilling depth of up to 10 times the diameter of the drill. Laminated on the substrate is not high, the use of drill bit holder to avoid bias.
At present, most manufacturers use CNC drilling machine, CNC drilling using a carbide shank drill set, which is characterized to achieve automatic replacement drill. High positioning accuracy without the use of drill sets. Large helix angle, chip speed, suitable for high-speed cutting. In the range of the flute length, diameter of the drill is an inverted cone, when drilling with the hole wall friction is small, high quality drilling. Common drill shank diameter of 3.00mm and 3.175mm.
Drill material
PCB drilling with carbide drill bit is generally used as the epoxy glass cloth complex copper plate on the tool wear particularly fast. The so-called carbide drill gold is tungsten carbide powder as matrix, cobalt powder as a binder by pressurized sintering. Generally contain 94% tungsten carbide, 6% cobalt. Because of its high hardness, very wearable, a certain strength, suitable for high-speed cutting. But the toughness is poor, very brittle, in order to improve the performance of cemented carbide, and some use carbide substrate in a chemical vapor deposition on a 5-7 micron layer of special hard titanium carbide (TIC) or titanium nitride (TIN), to has a higher hardness. Some use ion implantation technology, titanium, nitrogen, and carbon injection the matrix certain depth, not only improves the hardness and strength and regrinding the drill can move into when they injected ingredients. There is a physical method to generate the bit at the top of a layer of diamond film, which greatly improves the hardness and wear resistance of the drill. Carbide hardness and strength, not only the ratio of cobalt and tungsten carbide, but also with the powder particles about. Carbide drill ultra fine particles, and its average grain size of tungsten carbide with 1 micron or less. This bit is not only high hardness and compressive strength and flexural strength are improved. To save costs Many drill shank welded structure, the original as a whole are carbide drill, drill shank back now made of stainless, but significantly reduced the cost of the material due to different concentricity less than its dynamic rigid whole alloy drill, particularly in the small diameter side.
The use of drill
1, the drill should be packed in special packing boxes, to avoid vibrations collide.
2, when used, from packing boxes should immediately remove the drill bit attached to the spindle collet header or automatic replacement drill tool library. Spent immediately put back packing boxes.
3, use the drill diameter measurement tool microscope and other non-contact measurement equipment, to avoid the cutting edge in contact with the mechanical gauge was bruised.
4, some CNC drilling machine CNC drilling using some positioning ring retaining ring is not used, such as the use of its positioning ring installation depth positioning must be accurate, as it does not use retaining ring fitted to the drill spindle elongation to adjust consistent, multi-spindle drilling machine to pay attention to this point, to make each spindle drilling depth to be consistent. If not possible to make drill drill drill through the surface or not caused by circuit board scrap.
5, using 40 times the usual three-dimensional microscopy drill blade wear.
6, the spindle and to always check the concentricity of the collet and the collet chuck clamping force, will result in poor concentricity of small diameter drill bit off and pore size, etc., the clamping force will cause the actual speed is not good Set speed does not match between the chuck and the drill bit slipping.
7, fixed shank drill head clamping collet drill shank length of 4 to 5 times the diameter to clamp securely.
8, should always check the spindle presser foot. Presser foot contact surface perpendicular to the spindle is horizontal and not shaking, to prevent drilling off the drill and produce partial holes.
9, drilling better than vacuuming, vacuum air temperature can be reduced drill, colleagues away dust reduce friction generates heat.
10, the substrate stack comprises upper and lower plate to drill a hole workbench trough positioning system to locate a prison, lie flat. Use adhesive tape to prevent the drill bit to be on the tape so that a drill swarf adhesion, causing difficulties and chip off the diamond.
11, ordering manufacturers drill, the factory inspection when sampling the compliance of its 4%. And 100% of 10 to 15 times with a microscopic examination of the gaps, scratches and cracks.
12, drill timely re-grinding, increase the use and re-drill grinding times, extending bit life, reduce production costs and expenses. Microscope usually measured length of the two main cutting edges, the wear depth should be less than 0.2mm. Regrinding when rubbed 0.25mm. Plain shank drill can be reground three times, shovel-shaped head (undercut) of the drill can be reground two times. Excessive turning grinding quality and accuracy of its drilling will decline, will cause the finished circuit board scrap. Excessive turning mill backfired.
13, when the wear due to abrasion and diameter reduction of 2% compared to the original, then the bit scrapped.
14 bit parameter settings in general, manufacturers have to provide a drill bit plant production speed and lower speed parameter table, the parameter is a reference only, the actual craft workers through actual use but also draw a line with The actual speed and the speed of the drill parameters are usually the reference parameter actual parameters are different but the difference is not too much.
The concept of drill
Bit is used to drill out the solid material through holes or blind holes, and is able to have a hole reaming tools. Twist drills are commonly used, flat drill, center drill, deep hole drilling and core drill. Reamers and countersinks although not drill holes in solid material, but will also be used to drill them into a class.
Flat drill
Cutting portion of the drill flat spade, simple structure, low cost, easily cutting fluid into the hole, but the cutting and chip performance is poor. Flat structure integral drill and assembly two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores. Fabricated flat diamond blade can be changed, can be cooled, mainly for the drilling diameter 25 to 500 mm large hole.
Deep hole drilling
Deep hole drilling is typically the machining hole depth is greater than the diameter of the bore of the tool 6. Commonly used gun drilling, BTA deep hole drilling, jet drill, DF deep hole drilling. Nesting also used in drilling deep holes.
Reamer
Reamer has three to four teeth, better rigidity than the twist, to expand the existing hole and improve the machining accuracy and finish.
Countersink
Countersinks have more teeth to the end of the hole forming method processed into the desired shape, for processing a variety of countersunk head screws countersunk holes, holes or flattened outer end face.
Center drill
Center drill for drilling holes shaft center of the diamond bandsaw blades workpiece, it is essentially a small twist by the helix angle and countersink drill composite, so called composite center drill.
Bit Structure
A drill, comprising a shank (1), a tip shank, the tip has two in a main plane (C-C) on the cutting insert (5,5 '), said cutting blade (5,5 ') having a second common plane (E-E) is oriented to the center of the short cutting edges. Said blade forms a point-like central cutting edges used to enter the workpiece, and thus the bit pair. In the arbor, the establishment of two flutes (6,6 '), the flute (6,6') extending from the tip end in the end. Any length along the surface of the arbor, the flutes are in the plane of the tube diametrically opposite positions to each other, the tube plane of the two sides of the tube with a common edge with a flat blade (F-F) to 90 ° extends in the plane of the shank has a maximum rigidity. Center cutting edge of the second plane (E-E) in alignment with the blade shank with a flat bottom or main rigidity direction (F-F) at approximately a 90 ° angle.
One kind of concrete, etc. in drilling operations, drilling state can ease the situation suddenly changed, so that drilling operations stable, even in large grain chips produced when drilling efficiency is not caused by lowering of the drill.
Configuration which substantially radial cutting edge portion having at least two main cutting edge portion, and arranged in the circumferential direction of said main cutting edge portion and between the main cutting edge portion, at least two sub cutting blade portion said main cutting edge portion includes a main cutting edge as the cutting blade, the cutting blade inner end of the main center of rotation, the outer end of the cutting edge portion in the outer periphery of the rotation locus.
A cutting edge portion of the sub cutting blade as the sub cutting blade, the sub cutting blade inner end is located off the center of rotation to the outer side of the site, the outer end is located in the rotating cutting blade portion deviated from the center of rotation locus of the outer edge position.
A drill, with a drill tip disposed on the plurality of cutting blade portion, and provided on the base end side of the cutting blade portion and the base end portion of the shank portion is formed with a shaft-shaped drill main body;
Said cutting blade portion has a flank of the cutting surface and the engagement surface protruding toward the front end edge of the cutting edge formed by said center of rotation of the cutting blade from the drill side arranged substantially radially outer side;
The rotary axis of the direction of movement and the operation of the impact operation of cutting the composite, characterized in that said cutting blade portion has at least two main cutting edge portion, and disposed in the circumferential direction of the ring saw blades main cutting edge portion and the main cutting between the blade, at least two sub cutting blade portion;
The main cutting edge portion having a cutting edge as a main cutting edge, an inner end of said main cutting edge is located in the center of rotation, the outer end of the cutting edge portion in the outer periphery of the rotation locus, the sub cutting blade portion having as its the sub cutting blade cutting edge, the secondary cutting blade inner end is located radially outwardly from the rotation center deviate from the site, the outer end portion in the rotation from the cutting edge to the center of rotation locus of the outer side of the deviated position.
PDC bits
PDC bits [1] for short. Is commonly used in the oil drilling industry as a drilling tool.
PDC continuous improvement of product performance
In the past few years, PDC cutter quality and type have undergone tremendous changes. If the teeth of the 1980s to today's teeth for comparison, the difference is quite large. Because hybrid technology and manufacturing process changes, today's cutting teeth is much better quality and performance, so that the anti-erosion and impact drill capabilities are greatly improved.
Engineers also tungsten carbide substrate and the interface between the diamond has been optimized to improve the toughness of the cutting teeth. Process innovations in the diamond layer is also used to improve the abrasion resistance and thermal stability.
In addition to material and manufacturing process developments outside, PDC products in the tooth tooth design techniques and fabric also achieved a major breakthrough. Now, PDC products have been used previously can not be applied in areas such as stiffer, stronger and changing abrasive formations. This extension to new areas, the diamond (fixed cutter) cone drill bit and the balance between a great impact.
Initially, PDC drill bit can only be used for soft shale formations, the reason is hard mezzanine will damage the drill bit. However, due to the emergence of new technologies and changes in the structure, the current PDC drill bit for drilling hard interlayer has been able to and a long section of the hard rock formations. PDC bits are increasingly being used by people, especially with the continuous improvement of quality PDC teeth, in which case more and more prominent.
Since teeth bit design and improvement, PDC drill bit orientability also will increase, which further weakened the past in motor drilling cone bit advantage. Currently, PDC drill every day in many applications where the drilling supplant cone drill bit market.
Commonly used mechanical drills, twist drills with straight shank (ordinary type), you can drill: 45 # steel, stainless steel, diamond hardness using the weak point of the material. Alloy drill, you can drill Cr12 steel, the use of diamond hardness strong material. Use drill expertise can allow himself to lower profits.
PCB Drill Type
PCB drill drill drill control Type: PCB drilling with a drill with straight shank twist drill, fixed and fixed shank twist drill shank Spade (undercut) drill bit. Straight shank twist drill mostly for single head machines, PCB drilling relatively simple or single panel, now in a large circuit board manufacturing plant has been rarely seen in its drilling depth of up to 10 times the diameter of the drill. Laminated on the substrate is not high, the use of drill bit holder to avoid bias.
At present, most manufacturers use CNC drilling machine, CNC drilling using a carbide shank drill set, which is characterized to achieve automatic replacement drill. High positioning accuracy without the use of drill sets. Large helix angle, chip speed, suitable for high-speed cutting. In the range of the flute length, diameter of the drill is an inverted cone, when drilling with the hole wall friction is small, high quality drilling. Common drill shank diameter of 3.00mm and 3.175mm.
Drill material
PCB drilling with carbide drill bit is generally used as the epoxy glass cloth complex copper plate on the tool wear particularly fast. The so-called carbide drill gold is tungsten carbide powder as matrix, cobalt powder as a binder by pressurized sintering. Generally contain 94% tungsten carbide, 6% cobalt. Because of its high hardness, very wearable, a certain strength, suitable for high-speed cutting. But the toughness is poor, very brittle, in order to improve the performance of cemented carbide, and some use carbide substrate in a chemical vapor deposition on a 5-7 micron layer of special hard titanium carbide (TIC) or titanium nitride (TIN), to has a higher hardness. Some use ion implantation technology, titanium, nitrogen, and carbon injection the matrix certain depth, not only improves the hardness and strength and regrinding the drill can move into when they injected ingredients. There is a physical method to generate the bit at the top of a layer of diamond film, which greatly improves the hardness and wear resistance of the drill. Carbide hardness and strength, not only the ratio of cobalt and tungsten carbide, but also with the powder particles about. Carbide drill ultra fine particles, and its average grain size of tungsten carbide with 1 micron or less. This bit is not only high hardness and compressive strength and flexural strength are improved. To save costs Many drill shank welded structure, the original as a whole are carbide drill, drill shank back now made of stainless, but significantly reduced the cost of the material due to different concentricity less than its dynamic rigid whole alloy drill, particularly in the small diameter side.
The use of drill
1, the drill should be packed in special packing boxes, to avoid vibrations collide.
2, when used, from packing boxes should immediately remove the drill bit attached to the spindle collet header or automatic replacement drill tool library. Spent immediately put back packing boxes.
3, use the drill diameter measurement tool microscope and other non-contact measurement equipment, to avoid the cutting edge in contact with the mechanical gauge was bruised.
4, some CNC drilling machine CNC drilling using some positioning ring retaining ring is not used, such as the use of its positioning ring installation depth positioning must be accurate, as it does not use retaining ring fitted to the drill spindle elongation to adjust consistent, multi-spindle drilling machine to pay attention to this point, to make each spindle drilling depth to be consistent. If not possible to make drill drill drill through the surface or not caused by circuit board scrap.
5, using 40 times the usual three-dimensional microscopy drill blade wear.
6, the spindle and to always check the concentricity of the collet and the collet chuck clamping force, will result in poor concentricity of small diameter drill bit off and pore size, etc., the clamping force will cause the actual speed is not good Set speed does not match between the chuck and the drill bit slipping.
7, fixed shank drill head clamping collet drill shank length of 4 to 5 times the diameter to clamp securely.
8, should always check the spindle presser foot. Presser foot contact surface perpendicular to the spindle is horizontal and not shaking, to prevent drilling off the drill and produce partial holes.
9, drilling better than vacuuming, vacuum air temperature can be reduced drill, colleagues away dust reduce friction generates heat.
10, the substrate stack comprises upper and lower plate to drill a hole workbench trough positioning system to locate a prison, lie flat. Use adhesive tape to prevent the drill bit to be on the tape so that a drill swarf adhesion, causing difficulties and chip off the diamond.
11, ordering manufacturers drill, the factory inspection when sampling the compliance of its 4%. And 100% of 10 to 15 times with a microscopic examination of the gaps, scratches and cracks.
12, drill timely re-grinding, increase the use and re-drill grinding times, extending bit life, reduce production costs and expenses. Microscope usually measured length of the two main cutting edges, the wear depth should be less than 0.2mm. Regrinding when rubbed 0.25mm. Plain shank drill can be reground three times, shovel-shaped head (undercut) of the drill can be reground two times. Excessive turning grinding quality and accuracy of its drilling will decline, will cause the finished circuit board scrap. Excessive turning mill backfired.
13, when the wear due to abrasion and diameter reduction of 2% compared to the original, then the bit scrapped.
14 bit parameter settings in general, manufacturers have to provide a drill bit plant production speed and lower speed parameter table, the parameter is a reference only, the actual craft workers through actual use but also draw a line with The actual speed and the speed of the drill parameters are usually the reference parameter actual parameters are different but the difference is not too much.
The concept of drill
Bit is used to drill out the solid material through holes or blind holes, and is able to have a hole reaming tools. Twist drills are commonly used, flat drill, center drill, deep hole drilling and core drill. Reamers and countersinks although not drill holes in solid material, but will also be used to drill them into a class.
2013年8月7日星期三
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