Abstract
The present paper investigates conditions within the grinding zone itself. Also, it couples the grinding zone analysis to our earlier analysis of the inlet zone [C.C. Chang, S.H. Wang, A.Z. Szeri. On the mechanism of fluid transport across the grinding zone. ASME J. Manufactur. Sci. Eng. 118 (1996) 332–338; C.C. Chang, U.C. Chen. A predictive model of useful coolants on grinding porous media. International Conference on Precission Engineering (2nd ICMT). Singapore, 1995, pp. 367–372; C.C. Chang. The analysis of coolant flow and heat transfer in grinding. Chin. J. Mech. 12 (4) (1996) 513–524: C.C. Chang. An application of lubrication theory to predict useful flow-rate of coolants on grinding porous media, Tribol. Int. 30–38 (1997) 575–581.]. thereby creating a self-consistent model of the thermal process in grinding. Our model maintains distinct temperatures for coolant and grit. We view the grit as a porous matrix, in part saturated by coolant and in part by air; and apply volume-averaging techniques to solve the heat conduction problem in the porous media. The maximum temperature in the grinding zone, the workpiece temperature-distribution, the fraction of energy entering the workpiece, and the grinding energy flux that must be reached to burn, are calculated and are compared to experimental data for two coolant types, water and oil.
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