How to improve the abrasion resistance of brown corundum grinding wheel?
Take diamond grinding wheel as an example: in terms of composition, resin grinding wheel is generally composed of three major parts: resin, abrasive and filler.
Analysis: Insufficient holding power of resin to abrasive, causing abrasive to fall off prematurely; poor heat resistance of resin, softening or scorching occurs, causing abrasive to fall off or squeeze into the resin and cannot play the grinding role.
Suggestions: Use a resin with better heat resistance, currently there are polyimide resin powder and modified heat resistant phenolic resin are the more used resin bonding agents.
Analysis: The hardness, particle size and thermal conductivity of abrasives affect the wear resistance of grinding wheels. For example, diamond abrasives have a high thermal conductivity, and the grinding process will heat up sharply, leading to charring of the phenolic resin and loss of holding power to the abrasive grains, thus making = causing the abrasive grains to fall off quickly.
Suggestions: Select suitable abrasives, particle size, surface treatment such as plating and etching of abrasives to improve the strength of abrasives and enhance the bond between abrasives and resin. For example, the surface of the diamond is plated with nickel, copper and other metals, on the one hand, can play a role in heat storage, on the other hand, can improve the bond between the abrasive grains and resin.
Analysis: The addition of filler can play a certain role in thermal conductivity, different systems for different purposes to choose the right filler. For example, potassium cryolite can melt at more than 500 degrees to absorb a large amount of grinding heat, thus delaying the destruction of the resin binder by grinding heat and prolonging the service life of the grinding wheel.
Suggestion: Adding suitable fillers such as metal powder, chromium oxide, silicon carbide micronized powder and cryolite can effectively extend the service life of grinding wheels.