Grinding performance in crankshaft pin journal path-controlled grinding of 40Cr using CBN wheel

Abstract

In path-controlled grinding, unlike the cylindrical plunge grinding, the contour of the pin journal is achieved with the coupling actions both of the eccentric rotation of the pin and the grinding wheel linear movement. Since the circumferential feed rate varies periodically in path controlled grinding of crankshaft pin, the tangential and normal grinding force keep unsteady during the whole process. Therefore, it is necessary to acquire thorough understanding on the grinding characteristic in terms of grinding force, grinding force ratio, and specific grinding energy during path-controlled grinding. The rotational measurement method was used for achieving the grinding force information during grinding. A series of experiments were performed to investigate the machinability in crankshaft pin journal path-controlled grinding of 40Cr using vitrified bonded cubic boron nitride (CBN) abrasive. The effects of grinding parameters on grinding force are illustrated. Experimental results show that the grinding force ratio rises with increasing workpiece peripheral speed. The specific grinding energy is found to decline with increasing material removal rate. It is beneficial that the undeformed chip thickness should be designed largely for reducing the energy consumption.