过去我們在磨削和精車套筒类工件时,孔較大的就用彈簧夾头,孔較小的就用圓柱形心軸。这样加工,由于产生的摆差較大,对于內外圓同心度要求較高的工件,就很难保証質量,所以退修率很大。后来經苏联專家建議,改用了錐形心軸,就克服了这些毛病,保証了工件的同心度,并降低了工具 In the past when we were grinding and finishing the sleeve type of workpiece, the hole is larger collet chuck, the smaller the hole with a cylindrical mandrel. This processing, due to the larger swing, the internal and external circular concentricity demanding workpieces, it is difficult to ensure the quality, so a large rate of retreat. Later, the Soviet Union experts suggested that the use of tapered mandrel to overcome these problems, to ensure the concentricity of the workpiece, and reduce the tools