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一、前言当圆柱工件用顶尖支撑进行机械加工时,顶尖与工件中心孔的接触表面作为旋转轨道,同时也承受工件的重量和切削力。在理想条件下,接触表面是由同轴的且几何形状正确的圆锥顶尖和中心孔构成的。而实际上达到这样理想的状况十分困难,因为机械加工的顶尖和中心孔或多或少具有几何形状误差。此外它们也难以精确对中,因为两个中心孔之间偏差以及
I. INTRODUCTION When the cylindrical workpiece is machined with the top support, the contact surface between the top and the workpiece center hole serves as a rotating orbit, and at the same time, it also receives the weight and cutting force of the workpiece. Under ideal conditions, the contact surface is made up of concentric and geometrically correct conical tips and center holes. In practice it is very difficult to achieve such an ideal situation because the machining center and center holes have more or less a geometric error. In addition, they are difficult to center precisely because of deviations between the two center holes and