How to Improve Mechanical Strength of Diamond Grinding Wheels

In order to improve heat resistance and mechanical strength of phenolic resin bond in diamond grinding wheels, people achieve the purpose by adding all kinds of padding in the process of the preparation of resin abrasives.

For instance, adding copper powder can improve the heat resistance of resin; Adding some materials such as zinc oxide, chromium oxide, etc. can improve the mechanical strength of resin; Adding the flaky graphite, molybdenum disulfide and other soft materials, can improve the grinding performances of resin bond abrasives products.

But the most effective method for improving the performance of phenolic resin is to add organic material modifier. It may be because organic matter is matching with phenolic resin in the physical structure and surface properties, etc, compared to inorganic chemicals.

Polyimide resin is one of the best heat resistance resins, and using polyimide resin as the bond for preparation of diamond grinding wheel first appeared in the United States, and then has spread throughout the world, whose biggest characteristic is that grinding wheel has good thermal stability, and can be used under 250 ℃for a long time. Its durability is higher than phenolic resin bonded grinding wheel, and often used in hard abrasive grinding wheel load grinding.

Epoxy resin has good resistance to water and strong cohesive force, but its heat resistance is low, and in the process of preparing abrasives products, it is usually mixed with phenolic resin and polyimide resin. On the basis of not reducing materials’ heat resistance, it can improve the bond strength of resin bond. Urethane resin also has low heat resistance, but its abrasives products have high strength, generally applicable to light grinding.