研削中の工作物の振動について

Abstract

The relation between amplitude and frequency of workpiece in external-grinding is analysed in a single degree-of-freedom system with contact and grinding stiffnesses and examined experimentally in plunge-grinding. As a result of analytical investigation it is derived that with increase in amplitude the frequency of workpiece decreases, slightly in smaller amplitude due to the property of contact stiffness, and considerably in larger amplitude due to the loss of contact between workpiece and grinding wheel for a part of the cycle of vibration of workpiece. Then, applying Laser projected to the cutting zone tangentially to workpiece and grinding wheel, the phenomenon of this loss of contact can be directly observed in considerably larger amplitude of workpiece than the depth of cut. And from the results of plunge-grinding tests it can be seen that experimental values about amplitude and frequency of workpiece are relatively close to the analytical values, especially at the smaller depth of cuts. In this report the grinding stiffness is determined from the steady normal grinding force in plunge-grinding under various depth of cuts.