在磨削精密轴类或絲杆时,工件的圆度与同心振摆在很大程度上取决于中心孔的精度,要求中心孔的光洁度在▽▽▽▽10以上,与磨床顶尖的接触面大于80%。一般方法系在车床上用铸铁顶尖研磨,但由于车床本身精度较低,铸铁顶尖的角度不能做到与磨床顶尖一致,因此中心孔的接触不太理想。如工件精度要求很高,圆度在1微米以下,则必须在车床研中心孔后再进行一次手工精研修正,使工件中心孔与磨床顶尖 In the grinding precision shaft or screw, the workpiece roundness and concentricity depends largely on the accuracy of the center hole, the center hole required finish ▽ ▽ ▽ ▽ 10, and the top of the grinding machine contact surface More than 80%. The general method of grinding in the lathe with a cast iron top, but due to the low accuracy of the lathe itself, the top angle of the cast iron can not be consistent with the top of the grinder, the center hole contact is not ideal. Such as high precision workpieces, roundness of less than 1 micron, you must center the hole in the lathe after a manual correction, so that the workpiece center hole and grinder top