Internal Grinding of High Strength Ceramic Workpiece Materials with Diamond Grinding Wheels

Abstract

With increasing requirements for highly stressed components in respect to wear and friction behaviour, temperature stability and resistance to aggresive chemicals, ceramic materials have many advantages in comparison to metals. Beside these characteristics, high quality in dimension, shape and surface is often required. Ceramic components therefore often have to be ground or lapped. Up to now the influence of machine setting conditions and grinding wheel specifications on the grinding process has net been investigated very much. Therefore results about internal grinding of B 4 C, SiC, Al 2 O 3 , and Si 3 N 4 (hot pressed, reaction sintered) with resinoid and metal bonded and as well electroplated diamond wheels are explained. Results about G-ratios, grinding forces, workpiece roughness and shape deviations are described as function of cutting speeds, feed velocities, material removal rates and speed ratios. The dressing process of diamond wheels in combination with jet-sharpening is shown. The grinding wheel topography is described as function of sharpening period, jet pressure and abrasive flow rate.