轴类零件最后精加工的质量,与中心孔的正确与否有极密切的关系。我们在提高中心孔加工质量方面作过不少试验研究,曾用生铁顶尖加金刚砂光研,也曾把硬质合金刀片镶在顶尖上进行高速研磨,结果光洁度都达不到 8,给修整中心孔整形误差带来困难,对于较大型的中心孔(如 d=8～12毫米的 The quality of the final finishing of shaft parts is very closely related to the correctness of the center hole. We have done a lot of experimental research on improving the quality of hole machining in the center. We used the top of pig iron and carborundum to grind it. We also grind carbide inserts at the top for high speed grinding. As a result, the finish is less than 8, Hole shaping errors cause difficulties for larger center holes (eg d = 8-12 mm