Aluminium and aluminum grinding wheel grinding solutions

An aluminum alloy performance : In the non-ferrous materials used in aluminum is more common materials . It 's grinding , mechanical , physical properties of different types of steel and cast iron and other metal material, it has the following characteristics:
1, the hardness is low intensity : The maximum hardness of aluminum HB110 ~ 120, the maximum tensile  sds hammer drill bits strength is generally 20 ~ 30kg/cm2. Low hardness , scratch resistance of a material to plastic deformation or poor , the grinding surface is easily scratched and bumps .
2 , the plastic ductility large , the grinding process produces plastic adhesion , blocking wheel surface ; while a low melting point alloy (660 ~ 780 ℃), the temperature in the grinding zone , the surface of the metal melt , adhesive wheel surface , resulting in the increase of the melt adhesion of the blocking wheel .
3, the linear expansion coefficient: the grinding action of heat , the aluminum alloy is easy to cause deformation of the workpiece , thus affecting the precision grinding of the workpiece surface .
4 , the grinding efficiency is low : in order to overcome the alloy produced in grinding the workpiece thermal deformation , reducing the grinding wheel surface adhesion blocking , to ensure the surface quality , to increase the number of dressing , ordinary steel is about 3 times , thus reducing the grinding productivity.
Second, the choice of grinding wheel aluminum : Aluminum grinding process the biggest problem is the " stick" , " block "
A, aluminum ultra- fine grinding , mirror grinding : Use the "PVA" wheel, equivalent to Japan 's "UB" wheel . Can achieve the effect of the mirror . The grinding wheel is also similar in  floor polisher pads structure and ceramics ( see below ) .
B, aluminum and semi- coarse grinding :
1 , abrasives : The brittle and sharp black silicon carbide .
2 , binding agents : Use with high strength ceramic binder , and oil, acid, alkali, corrosion resistance .
3 , particle size : to meet the requirements of the case using the coarse number. Coarse : selection of 36 to 46 # ; grinding : the use of 60-80 ; coarse grit No. relatively small number of participating grinding , grinding, less heat , reducing the deformation of the workpiece and the grinding wheel clogged ;
4 , hardness: should opt for a lower hardness, the grinding wheel to maintain a good self-sharpening . Generally used in H ~ J hardness .
5, the organization : an organization should adopt a more accommodating loose debris , so that the cooling fluid into the grinding zone , enhancing the cooling effect, reducing the grinding zone temperature . Should be used in large pores wheel loose organization , with good grinding effect .
Third, the grinding fluid :
Cleaning performance in a well , good lubrication properties , the cooling performance of the grinding fluid. And grinding fluid supply to the full, to ensure a good cleaning and cooling effect. Manufacturers recommend the use of aluminum alloy special grinding mill grinding fluids, such as Castrol 's ALUSOL series. If conditions do not allow the use of diesel as a grinding fluid can , practice effect is still relatively satisfactory. However, the process of using diesel oil mist prone and volatile . In view of this : You can add a small amount of diesel oil or carbon tetrachloride.
Four , grinding techniques:
1 , the grinding process feed rate should be uniform , especially infeed .
2 , the grinding process aluminum wheel is easy to plug , passivation, so the wheel machined surface is prone to scratches and burns , it needs to be lubricated wheel surface machining : coated with lubricating fluid can be increased , oil, cream. You can use paint wheel diesel , but dirty. You can attach the candle , industrial wax , lubricants, lubricating ointment . Can reduce the congestion caused by burns , scratches and so on.
3 , wheel above the sticky aluminum scrap , you can use stone or the use of a favorable blade. Scratch the sticky crumbs.
4, the wheel must be timely  cutting discs trimming , trimming some of the rough , but it must be sharp to prevent clogging .
5 , you can use wheel cutter wheel corners down angle . To facilitate the timely discharge of aluminum scrap .