Effect of resin grinding wheel characteristics on the performance of grinding wheel
1. Abrasive grain size: The common particle size is: 22#-80#, and the cutting efficiency is low when the particle size is fine.
2, grinding wheel hardness: common hardness: P, Q, R; N, S; generally use a harder diamond grinding wheel to reduce wheel wear. The hardness is controlled by factors such as the amount of binder, molding density, firing temperature and firing time.
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3, abrasive material: cutting abrasive wheel commonly used abrasives are brown jade (A), white corundum (wA), black corundum (BA), black silicon carbide (c), etc., the most commonly used is brown fused alumina, because brown fused alumina has high hardness It has the characteristics of high toughness, sharp particles, strong applicability and low price compared with other abrasives. Brown fused alumina is divided into primary sand and secondary sand according to its reduction during smelting, mainly in chemical composition: Al2O3 content of primary sand is ≥94.5; Al2O3 content of secondary sand is <94.5%; generally 85% Left and right, and the Fe2O3 content is 4 to 5%; therefore, the hardness of the secondary sand is lower than that of the primary sand, but the price is also low; the brown corundum is suitable for the processing of various carbon steels and general alloy steel; the white corundum is higher in hardness than the brown corundum. It has large brittleness and small grinding heat. Because of its high price, it is used for heat deformation of workpieces. It is also used as mixed abrasive for special material processing. The content of Al2O3 in black corundum is 70-85%, and the content of Fe203 is 7-9. Low hardness, poor cutting force, but the price is also cheap; black silicon carbide has high hardness and good brittleness, sharp cutting edge, good self-sharp performance, good thermal conductivity, and advantages in processing non-ferrous metals, plastics, rubber and cast iron.
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4. Bonding agent: Common resin binders are: powdered phenolic resin and liquid phenolic resin. Powdered phenolic resin has good processability, the molding density of abrasive tools is slightly smaller, the tissue number is slightly larger, and the price is higher than liquid phenolic resin; the price of liquid phenolic resin is low, but the material is easy to agglomerate and the mixed material is not easy to be uniform, which is easy to cause local abrasive parts. hard.
5. Organization: The tissue number of the diamond grinding wheel should be slightly larger to improve the cutting efficiency: too large and affect the strength. The commonly used organization number is 3-7.