Application of CVD diamond powder for grinding steel materials

This paper describes the application of CVD diamond powder, that is produced from the roll milling of diamond films synthesized by the arc discharge plasma jet CVD method, to the grinding of steel materials. CBN powder instead of diamond powder is generally used for grinding steel materials. The reason is that at high temperatures at the grinding point the wear of the cutting point of diamond powder occurs by heat chemical reactions. But CVD diamond powder has a remarkable characteristic in which new cutting edges are easily produced during its grinding process because CVD diamond powder has grain boundaries and defects in the crystal. Metal bonded and resinoid bonded grinding wheels are prepared using CVD diamond powder. In case of the grinding of SKD11 the powder wears a lot, and the grinding power is very unstable. In case of the grinding of FC20 with a resinoid bonded wheel, the powder fractures in a limited amount, and the grinding power is stable. Therefore, the CVD diamond powder can be used for grinding steel materials like FC20.