Selection of grinding wheels for double disc grinding machines
Double disc grinding machine is a kind of high-precision grinding equipment, which is widely used in automobile, electronics and precision machinery, etc. The selection of grinding wheels is crucial to its processing efficiency and quality. A suitable grinding wheel not only improves machining accuracy, but also extends the service life of the equipment and the grinding wheel. When selecting grinding wheels, various factors such as material, grain size, hardness and bonding agent need to be considered.
First. Selection of grinding wheel material
The material of the grinding wheel directly affects its hardness, wear resistance and grinding performance. The following are common grinding wheel materials:
Ceramic grinding wheel: high hardness, good wear resistance, suitable for steel and cast iron grinding processing. It is widely used for all kinds of hard metal materials and has good heat resistance and long service life.
Diamond Grinding Wheel: Extremely high hardness, mainly used for grinding hard materials such as hard alloy, ceramics, glass, etc., which can provide ultra-high precision and surface finish. However, diamond grinding wheels are not suitable for processing steel and iron because diamond reacts chemically with ferrous metals at high temperatures.
CBN Grinding Wheel (Cubic Boron Nitride): The hardness is second only to diamond, but the chemical stability is better, especially suitable for grinding iron and steel materials.CBN grinding wheels are suitable for machining high speed steel and tool steel, with high efficiency and durability.
Second. Selection of grinding wheel grain size
The grain size of the grinding wheel determines the machining accuracy and grinding efficiency of the workpiece surface.
Coarse grain grinding wheel (low mesh size): suitable for rough grinding, can quickly remove material, high efficiency, but the surface roughness is poor, suitable for the initial processing that requires a large amount of material removal.
Medium and fine grit grinding wheels: for semi-finish and finish grinding, which ensures processing efficiency and provides good surface quality, suitable for most grinding tasks.
Fine-grained grinding wheels (high mesh): suitable for ultra-precision machining, providing an extremely high surface finish, but with weak material removal, mostly used in the final finishing step.
Third. Selection of grinding wheel hardness
The hardness of the grinding wheel reflects the ease of abrasive removal and is suitable for materials of different hardness:
Soft grinding wheels: Suitable for processing hard materials (e.g. steel), capable of keeping the grinding surface sharp by shedding abrasive quickly, ensuring efficient grinding.
Hard grinding wheels: suitable for processing soft materials, slower abrasive removal, can extend the life of the grinding wheel.
Fourth. Selection of the bond
Bonds are used to bind abrasive particles together. Different types of bond affect the strength, heat resistance and grinding performance of the grinding wheel.
Ceramic bond: High temperature resistant, suitable for long time high load work, usually used for high precision machining.
Resin bond: good flexibility, suitable for fine grinding and workpieces with high surface finish requirements, but with poor heat resistance.
Metal bond: high strength, good abrasion resistance, suitable for grinding of high hardness materials, but more heat in the grinding process, requiring a good cooling system to match.
Conclusion
The selection of grinding wheels for double disc grinding machines requires comprehensive consideration of the processing materials, grinding process and equipment performance. By reasonably selecting the material, grain size, hardness and bond of the grinding wheel, the productivity can be improved and the frequency of wheel replacement can be reduced while ensuring the processing quality, thus realizing precise and efficient processing.
