DrillWe drill is widely used in construction machinery hardware, it is used in the drilling of solid material through holes or blind holes , and is able to have the hole reaming tools. However, we choose different operating environments are also different types of drill bits , drill bits used mainly twist , flat drill, center drill , deep hole drilling and core drill . Reamer and countersink drill , although not on the physical material drilling, but the habit will also drill them into a class . Here , together with Xiaobian look at different types of drill bits for different uses of it .
Twist is the most widely -processing tool . Diameter in the GUSHI concrete polishing pads range of usually 0.25 to 80 mm . It is mainly composed of a working portion and a shank portion . Working part has two spiral grooves , the shape of cannabis, hence the name. In order to reduce the wall of the guide portion and the hole drilling friction , twist from the direction of the drill tip to gradually reduce the diameter of the shank inverted cone . Twist the helix angle corner came mainly affect the size of the cutting edge , edge flap strength and chip performance , typically 25 ° ~ 32 °. Available spiral groove milling, grinding , hot rolling or hot extrusion processing methods , the cutting portion is formed by sharpening the drill tip . Vertex standard twist drill cutting part 118 , chisel edge angle is 40 ° ~ 60 °, the angle of 8 ° ~ 20 °. For structural reasons , the rake angle at the outer edge of the large decreases toward the middle , chisel at a negative rake angle ( up to about -55 °), from the squeezing action when drilling . In order to improve the cutting twist drill , according to the nature of the material to be machined and ground into the cutting portion of the repair various shapes ( such as drilling group ) . There shank twist and form two straight shank taper shank , when caught in the drill chuck machining the former , the latter is inserted in the machine spindle or tailstock taper in . General manufacturing HSS twist drill . Inserts welded carbide blade or twist the crown for machining cast GUSHI tile cutting blades iron , hardened steel and non-metallic materials , solid carbide twist drills for machining small parts and printed circuit boards and other instrumentation .
Flat diamond cutting part Spade, simple structure, low cost, easy to import coolant hole, but cutting and chip performance is poor . Flat structure with integral drilled and assembled two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores . Fabricated flat diamond blade can be changed, the cooling can be mainly used for drilling large diameter holes 25 to 500 millimeters.
Deep hole drilling process usually refers to the ratio of the aperture hole depth and hole cutter more than 6 . Commonly used gun drilling , BTA deep hole drilling, jet drilling , DF deep hole drilling. Nesting also commonly used in deep hole drilling process .
The reamer 3 to 4 teeth , better rigidity than the GUSHI cutting discs twist drill , a hole has been used to expand and improve the machining accuracy and finish .
Countersink drill has more teeth to the hole forming method will be processed into the desired shape of the end for the processing of various countersunk head screws countersunk holes , or outer end face flattened hole.
Center drill for drilling shaft center hole with a piece , which is essentially a small twist of the helix angle drill and countersink compounded , so called composite center drill.
Hollow drill drill drill pipe is hollow in the middle , the main material used for core drilling .
PCD grinding wheel
2014年3月13日星期四
Some simple introduction diamomd core drill bits for
Twist is fixed by rotating the cutting axis relative to the workpiece hole drilling tools. Its capacity and shape into a spiral flute twist named. Helical groove has two grooves, slots or more grooves 3, but the most common two grooves.
Limiting aperture diameter twist drill by GUSHI concrete saws the spiral groove to make finer core drilling, drill bit low stiffness; only two edges with guide, easily skewed axis of the hole; chisel difficult to make a centering axial resistance increases, drill easy to swing. Therefore, the drilled hole shape and position errors. Twist the flank and rake face is curved along the main cutting edge the rake angle at each point, the angle GUSHI metal grinding wheel is not the same as the front transverse edge of the corner of -55 °. Cutting conditions are poor; distribution along the cutting edge of the cutting speed is unreasonable, the maximum intensity of the lowest point of a sword cutting so badly worn. Therefore, the hole machining accuracy is low. The whole cutting edge of the drill cutting edges participants, each point on the cutting edge not equal, the chip is easy to form a spiral, chip difficult.
Therefore, chips and the hole wall GUSHI diamond discs friction extrusion often scratch the cell walls, a low surface roughness after processing.
Limiting aperture diameter twist drill by GUSHI concrete saws the spiral groove to make finer core drilling, drill bit low stiffness; only two edges with guide, easily skewed axis of the hole; chisel difficult to make a centering axial resistance increases, drill easy to swing. Therefore, the drilled hole shape and position errors. Twist the flank and rake face is curved along the main cutting edge the rake angle at each point, the angle GUSHI metal grinding wheel is not the same as the front transverse edge of the corner of -55 °. Cutting conditions are poor; distribution along the cutting edge of the cutting speed is unreasonable, the maximum intensity of the lowest point of a sword cutting so badly worn. Therefore, the hole machining accuracy is low. The whole cutting edge of the drill cutting edges participants, each point on the cutting edge not equal, the chip is easy to form a spiral, chip difficult.
Therefore, chips and the hole wall GUSHI diamond discs friction extrusion often scratch the cell walls, a low surface roughness after processing.
2014年3月11日星期二
Some factors drill bits working conditions
PDC drill extremely harsh working conditions , not only in the work under enormous pressure , but also to withstand the impact of alternating composite role of various forces cause friction in the cutting process is intense, as the matrix PDC drill not only to strong mechanical GUSHI carbide saw blades properties, but also by a good thermal shock resistance and corrosion resistance. Pants body material, precision machining, heat treatment , welding , etc. after grinding becomes very important , which requires pants body material to high quality carbon steel, processed into pants body to make the appropriate heat treatment, ie after quenching low-temperature tempering , the hardness of the surface after the heat-treated pants between 40 ~ 42HRC, tempered martensite .
Separating the main reason underpinning the diamond layer and WC diamond coating layer is less mature and stable technology , poor adhesion of the diamond and the substrate , resulting in premature lapse diamond film was peeled from the WC denture base layer , greatly reducing the life of GUSHI circular blades the drill bit and cutting . Process measures progress / Substrate Adhesion : purification surface roughening treatment to remove the carbide tool during the manufacturing process inevitably remain in the substrate surface contaminants, adsorption , oxides , to alter the surface of the substrate microstructure ; addition to the lower surface of the adhesion strength of WC particles , to increase the contact area of the reaction gas sources and the substrate , the substrate surface to increase the surface energy , the progress of the diamond substrate on heterogeneous nucleation density , thereby enhancing the film / substrate adhesion. Commonly used methods are: chemical cleaning , mechanical mosaic powder , liquid ultrasonic treatment. PDC thermal residual stress is the main cause of its non- normal failure , reduce internal thermal GUSHI carbide drill bits residual stresses PDC PDC is progressive performance most effective way , through the use of non-planar gradient transition connection technology and technology that can increase the PCD layer and hard carbide and the contact area of the stress relaxation due to the physical performance parameters of the difference in thermal expansion coefficients of the two materials , the elastic modulus of the resulting concentrate . Only take the form of specific structures and transitional justice to be graded in order to effectively reduce the thermal residual stress PDC , its ability to impact fracture gaining the upper hand , the progress of its yield and lifetime. The internal stress of the diamond powder and titanium powder sintered layer , the DLC film , a tungsten / diamond gradient composition layer method , the film is preferably eliminated due to lattice mismatch with the base plate , the difference in coefficient of thermal expansion caused by : applying an intermediate layer .
Separating the main reason underpinning the diamond layer and WC diamond coating layer is less mature and stable technology , poor adhesion of the diamond and the substrate , resulting in premature lapse diamond film was peeled from the WC denture base layer , greatly reducing the life of GUSHI circular blades the drill bit and cutting . Process measures progress / Substrate Adhesion : purification surface roughening treatment to remove the carbide tool during the manufacturing process inevitably remain in the substrate surface contaminants, adsorption , oxides , to alter the surface of the substrate microstructure ; addition to the lower surface of the adhesion strength of WC particles , to increase the contact area of the reaction gas sources and the substrate , the substrate surface to increase the surface energy , the progress of the diamond substrate on heterogeneous nucleation density , thereby enhancing the film / substrate adhesion. Commonly used methods are: chemical cleaning , mechanical mosaic powder , liquid ultrasonic treatment. PDC thermal residual stress is the main cause of its non- normal failure , reduce internal thermal GUSHI carbide drill bits residual stresses PDC PDC is progressive performance most effective way , through the use of non-planar gradient transition connection technology and technology that can increase the PCD layer and hard carbide and the contact area of the stress relaxation due to the physical performance parameters of the difference in thermal expansion coefficients of the two materials , the elastic modulus of the resulting concentrate . Only take the form of specific structures and transitional justice to be graded in order to effectively reduce the thermal residual stress PDC , its ability to impact fracture gaining the upper hand , the progress of its yield and lifetime. The internal stress of the diamond powder and titanium powder sintered layer , the DLC film , a tungsten / diamond gradient composition layer method , the film is preferably eliminated due to lattice mismatch with the base plate , the difference in coefficient of thermal expansion caused by : applying an intermediate layer .
2014年3月2日星期日
diamond core drills line describes the role of the saw blade
Saw blade about the role of the first line is used to cut a sheet of solid material circular tool collectively. Blade can be divided into: diamond saw blade for stone cutting; materials for metal cutting HSS film (not inlaid carbide tip); for wood, furniture, plywood, aluminum, aluminum , radiators, plastics, steel and other cutting carbide saw blades. Carbide alloy GUSHI stone drill bits containing carbide saw blade type, a plurality of parameters of material, diameter, number of teeth, thickness, profile, angle, pore size of the matrix, which determine the processing capacity and the cutting blade. When you select the type of cutting blade according to the material, thickness, cutting speed, cutting direction, feeding speed, road width requires the correct selection of the saw blade. (A) the choice of carbide species commonly used types of tungsten carbide cobalt (Code YG), tungsten, titanium category (Code YT). Select ⒈ (two) 65Mn spring steel substrate elasticity and plastic, the material economy, good hardenability heat treatment, the heating temperature is low, deformation can be used for less demanding requirements of the cutting blade. ⒉ carbon tool steel carbon high thermal conductivity, but by 200 ℃ -250 ℃ temperature sharp decline in its hardness and wear resistance, heat treatment deformation, poor hardenability, tempering a long time easy to crack. Materials such GUSHI cutting disc for drill as tool manufacturing economy T8A, T10A, T12A and so on. ⒊ alloy tool steels compared with carbon tool steel, heat resistance, wear resistance, good processing performance, heat distortion temperature of 300 ℃ -400 ℃ suitable for the manufacture of high-grade alloy saw blade. Permeability, hardness and rigidity ⒋ speed tool steel with good quenching, less heat distortion, is ultra-high strength steel, suitable for the manufacture of high-grade thermoplastic stable thin saw blade. (C) the choice of diameter and thickness of the blade diameter sawing equipment used for sawing and related artifacts. Blade diameter is small, the cutting speed is relatively low; blade diameter saw blade and cutting equipment requirements will be higher, while cutting efficiency is high. The outer diameter of the circular saw blade different machine models choose to use according to the diameter of the blade matches. (D) Select the number of teeth of the serrated teeth, the teeth more generally, the more the cutting edge per unit time, the better the cutting performance, but required more and more carbide cutting teeth number, the price of the blade high, but the jagged too close, the teeth of the chip becomes smaller, easy to cause the blade fever; another jagged too, when the feed rate mismatch, it rarely cut per tooth, will exacerbate friction with the workpiece edge , affect the life of the blade. Typically tooth pitch 15-25mm, should be selected based on a reasonable number of teeth sawing material. (E) the choice of the thickness of the blade thickness theoretically we hope blade thinner the better, is actually a kerf consumption. Materials and manufacturing processes alloy saw blade matrix determines the thickness of the blade, the thickness is too thin, easy to shake when the blade work, the impact of cutting effect. To consider when GUSHI abrasive grinding wheels selecting blade thickness from work and the stability of the blade sawing materials. Some special-purpose material thickness are also specific requirements, equipment requirements should be based on use, such as slotting saw blades, saw blades crossed. (F) the choice of common tooth tooth tooth left and right (alternating teeth), flat teeth, flat teeth ladder (low gear), inverted trapezoidal tooth (inverted conical teeth), dovetail teeth (tooth hump), and does not common industrial grade three left-right, left right left right flat teeth and so on. ⒈ the most widely used around the teeth, fast cutting, grinding is relatively simple. For open crosscut saw all kinds of materials and soft and hard wood profiles and MDF, plywood, particle board, etc. Equipped with anti-rebound force protection around the tooth tooth tooth is dovetail for longitudinal cutting of all kinds have burl panels; around tooth saw blade with a negative rake angle due to the sharp serrated, good cutting quality, typically used for stickers panel sawing.
订阅：
博文 (Atom)