Grinding temperature in high speed deep grinding of engineering ceramics

Abstract

The paper presents an investigation of the thermal behaviour of high speed deep grinding (HSDG) for engineering ceramics, yttria partially stabilised zirconium (PSZ) and Al2O3, using the grindable thermocouple technique. Effects of the grinding conditions, including wheel velocity, feed rate and depth of cut, on the temperature were investigated. It was found that the grinding temperature measured under different grinding conditions varied from 100°C to 300°C when the wheel velocity was smaller than 160 m/s. The temperature could rise to about 800°C at the wheel velocity of 160 m/s. The enhanced resistance of the air barrier formed around the wheel periphery at the higher velocity to the coolant supply was mainly responsible for the temperature rise. When the grinding forces and temperatures are considered comprehensively, high wheel speed and large depth of cut are preferable for the wet HSDG of engineering ceramics under low workpiece feed rate.