Improvement of grinding fluid supply method in grinding of alumina ceramics and cemented carbides with straight cup diamond wheel

Alumina ceramics and cemented carbides are ground by diamond wheel in many cases. And a vertical spindle surface grinding machines with a rotary table are widely used for grinding of these materials. In these type of machine tools, a cup grinding wheels are usually used. Grinding fluid is supplied from the center of the main shaft and spread by a simple centrifugal force conventionally. However, a loading occurs easily in this method. Two supply methods of grinding fluid were developed in order to improve the conventional method. A plate part and a groove part were set separately in the straight cup wheel. As a result, the grinding fluid flowed strongly and the ground chips were removed out effectively. The ground surface roughness of alumina ceramics and cemented carbides in this developed methods were smaller than that of the conventional method. And the loadings were not occurred using developed method even in the case of large depth of cut. © 2020 Japan Society of Powder and Powder Metallurgy