Study of 3D grinding temperature field based on finite difference method: considering machining parameters and energy partition

Abstract

Grinding temperature is an important parameter in affecting the quality of grinding. The higher grinding temperature would cause thermal damage to workpiece. But in the actual grinding processing, it is difficult to measure the grinding temperature in real time. This paper presents the finite difference method to calculate the grinding temperature. When calculating the grinding temperature, an important physical quantity cannot be avoided; it is the energy partition and it is the fraction of the grinding energy transported as heat to the workpiece at the grinding zone. At present, there are a lot of calculation models for the energy distribution, but no one is very exact, and most models are exclusive for alumina grinding wheel grinding. Based on measuring the grinding force and temperature, the heat flux toward the workpiece can be back-calculated by finite difference method that compared the difference between the thermal model and experimental results; thus, the energy partition can be obtained. The results show that it provides a 3D graphic image of the whole temperature field by using the fused deposition modeling (FDM). And the influences of feed rate on grinding temperature and of energy partition are significant compared with the grinding speed and depth of cut. The improvement of feed rate can effectively reduce the grinding temperature, but energy partition has a significant rise. After repeated research, an approximate value of energy partition was obtained by using vitrified bond cubic boron nitride (CBN) wheel grinding titanium alloy material TC4, and it was about 5 % under dry grinding.