Thermal and transformation stresses that develop from heat generated during grinding can easily damage the surface of the part being ground. These stresses can be minimized by: Using grinding fluids that act as both lubricants and coolants to dissipate heat and avoid stress development; Using less rapid metal-removal rates; and Grinding with a wheel of proper grit size that is not glazed or loaded with grit. Grinding often has been described as a high-speed milling operation with the grinding-wheel grains compared to the sharp edges of a cutting tool. These grains have irregular shapes, and their sharp cutting edges and the down-feed wheel pressures work in combination to generate high temperatures at the point of contact on the surface of the steel. Even though much of the heat produced is carried away by the steel being removed and absorbed by the grinding wheel itself, tremendous heat is still infused into the part being ground.
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