Ordinary grinding wheel selection
(1) Abrasive selection The choice of abrasive depends mainly on the workpiece material and the heat treatment method.
a. When grinding a material with high tensile strength, use a high toughness abrasive.
b. When grinding materials with low hardness and high elongation, use brittle abrasives.
c. When grinding a material with high hardness, use a higher hardness abrasive.
d. Select an abrasive that is not susceptible to chemical reaction by the material being processed.
flap disc manufacturer,flap wheel factory,zirconia aberasive belt,grinding disc
The most commonly used abrasives are brown corundum (A) and white corundum (WA), followed by black silicon carbide (C) and green silicon carbide (GC). The rest are also commonly used in chrome corundum (PA), single crystal corundum (SA). , microcrystalline corundum (MA), zirconium corundum (ZA).
Brown corundum grinding wheel: brown corundum has high hardness and high toughness. It is suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable cast iron, hard bronze, etc. This kind of abrasive has good grinding performance and wide adaptability. It is often used to cut a large amount of coarse grinding, which is cheap and can be widely used.
White corundum grinding wheel: The hardness of white corundum is slightly higher than that of brown corundum, and the toughness is lower than that of brown corundum. When grinding, the abrasive grains are easily broken. Therefore, the grinding heat is small, and it is suitable for manufacturing fine-hardened steel and high carbon steel. High-speed steel and grinding wheels for grinding thin-walled parts are more expensive than brown fused alumina.
Black silicon carbide grinding wheel: Black silicon carbide is brittle and sharp, and its hardness is higher than that of white corundum. It is suitable for grinding materials with low mechanical strength, such as cast iron, brass, aluminum and refractory materials.
Green silicon carbide grinding wheel: Green silicon carbide has higher hardness and brittleness than black silicon carbide, sharp abrasive grain and good thermal conductivity. It is suitable for grinding hard and brittle materials such as hard alloy, optical glass and ceramics.
Chrome corundum grinding wheel: suitable for grinding tools, measuring tools, instruments, threads and other workpieces with high surface quality requirements.
Single crystal corundum grinding wheel: suitable for grinding stainless steel, high vanadium high speed steel and other materials with high toughness, high hardness and easily deformed burns.
Microcrystalline corundum grinding wheel: suitable for grinding stainless steel, bearing steel and special ductile iron, etc., used for forming grinding, cutting grinding, mirror grinding.
Zirconium corundum grinding wheel: suitable for grinding Austrian stainless steel, titanium alloy, heat resistant alloy, especially suitable for heavy-duty grinding.
flap disc manufacturer,flap wheel factory,zirconia aberasive belt,grinding disc
(2) The choice of particle size depends mainly on the surface roughness and grinding efficiency of the workpiece being ground.
Particle size refers to the particle size of the abrasive and its size is indicated by the particle size number. When grinding with coarse-grained grinding wheels, the production efficiency is high, but the surface of the ground workpiece is rough; when grinding with a fine-grained grinding wheel, the surface roughness of the ground workpiece is better, and the productivity is lower. Under the premise of meeting the roughness requirements, coarse-grained grinding wheels should be used as much as possible to ensure high grinding efficiency. Generally, a coarse-grained grinding wheel is used for rough grinding, and a fine-grained grinding wheel is used for fine grinding.
When the contact area between the grinding wheel and the workpiece is large, a grinding wheel with a coarser grain size is used. For example, grinding the same plane, the grinding of the end face of the grinding wheel is thicker than the grinding of the periphery of the grinding wheel.
(3) The choice of hardness depends mainly on the workpiece material being ground, the grinding efficiency and the quality of the machined surface.
Hardness refers to the difficulty of the abrasive wheel falling off under the action of external force. In order to meet the requirements of different workpiece material grinding, the grinding wheel is divided into different hardness grades.
The grinding wheel is selected too hard, the blunt abrasive grains are not easy to fall off, the grinding wheel is easy to block, the grinding heat is increased, the workpiece is easy to burn, the grinding efficiency is low, and the surface quality of the workpiece is affected; the grinding wheel is selected too soft, and the grinding grain is also off when it is sharp. Increases the wear of the grinding wheel, easily loses the correct geometry and affects the accuracy of the workpiece. Therefore, the choice of the hardness of the grinding wheel should be appropriate. It should also be considered according to the contact area of the grinding wheel and the workpiece, the shape of the workpiece, the way of grinding, the cooling method, the type of bonding agent of the grinding wheel and other factors.
flap disc manufacturer,flap wheel factory,zirconia aberasive belt,grinding disc
The following grinding wheel hardness selection principles are for reference:
a. When grinding soft materials, choose a harder grinding wheel. When grinding hard materials, choose a soft grinding wheel.
b. When grinding soft and tough non-ferrous metals, the hardness should be selected to be softer;
c. Grinding materials with poor thermal conductivity should be selected as softer grinding wheels;
d. When the end face grinding is more than the circumferential grinding, the hardness of the grinding wheel should be softer;
e. Under the same grinding conditions, the hardness of the resin bond grinding wheel is 1~2 lower than that of the ceramic bond grinding wheel;
f. When the grinding wheel rotates at a high speed, the hardness of the grinding wheel can be softly 1~2 small;
g. Grinding with coolant is 1~2 less than the hardness of the grinding wheel when dry grinding.
Wechat Service
