平面研削における形状精度に関する研究 プランジ研削における形状の創成過程

Abstract

The present paper deals the profile of a ground surface under successive plunge grinding considering the thermal stress, the attraction force of a magnetic chuck, the variation of a depth of cut due to the thermal deformation and the shape of preground surface, both theoretically and experimentally. The process of forming the profile of a ground surface in a series of plunge grinding is estimated by an approximate analysis taking the above-mentioned factors into consideration and is also precisely analyzed by a finite element method. The consequences are compared with the measured profiles of ground surfaces. The main results are as follows : (1) The straightness of a ground surface is gradually improved by decreasing the wheel depth setting with the number of grinding passes and, moreover, is efficiently improved by setting the wheel depth of cut at the bottom of preground surface. (2) Around the workpiece corners, the residual stock removal is increased by the local thermal bending deformation. (3) A change of the workpiece shape with the number of grinding passes roughly agrees with the approximately analyzed results.