Surface Grinding Characteristics of Si<sub>3</sub>N<sub>4</sub> Ceramics under High-Speed and Speed-Stroke Grinding Conditions

Abstract

Si3N4 ceramic specimens were ground under different conditions with high-speed (wheel speed: 55m/s) and speed-stroke (table speed: 45-90m/min). The grindability was evaluated by grinding force, specific grinding energy and grinding ratio in comparison with conventional surface grinding. The strength degradation and surface roughness of ground workpieces were examined. The main results are summarized as follows. (1) This grinding conditions showed lower normal grinding force and specific grinding energy in a higher stock removal rate. And, the strength degradation and the surface roughness were not changed significantly even by increasing stock removal rate. (2) The lower normal grinding force and specific grinding energy were caused by a lower mean value of the maximum grain depth of cut. (3) This grinding conditions showed lower specific grinding energy in increasing stock removal and higher grinding ratio.