NUMERICAL INVESTIGATION OF TRANSIENT THERMAL-STRESSES OF WORKPIECE INSURFACE GRINDING

Thermal stresses on a ground surface are one of the main concerns duri ng surface grinding. The purpose of this article is to investigate the three-dimensional thermal stresses induced by grinding represented by a moving triangular heat source. The solutions of transient thermal s tresses are derived by the Goodier's thermoelastic potential and Galer kin functions. The stresses are calculated numerically by the inverse Fourier transformation and integration of Simpson's 3/8 rule. Results show that the stress in the direction of the grinding depth is compres sive and larger than the tensile stress along the feed direction. The stresses near the grinding zone change drastically. The workpiece feed rate is the main factor affecting the normal stresses. Cooling is esse ntial in surface grinding, which can effectively reduce the normal str esses to zero or perhaps to negative value.