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轴类工件的最后精加工,一般都要求表面光泽度达到▽▽▽7以上,并且外圆对轴线的振摆偏差要求也很严格。要保证这类工件的质量,就必须要有良好的顶尖孔。如果顶尖孔的锥度不准确,光泽度达不到▽▽▽9以上;特别是工件在淬火后顶尖孔会变形,如果不娇正,工件的质量就很难保证。因此,需要精加工的轴类工件,顶尖孔应该过研磨。我厂以前研磨顶尖孔,是在车床上用生铁车成的顶尖来进行,效率又低,
The final finishing of shaft type workpieces, generally require the surface gloss to reach ▽ ▽ ▽ 7 or more, and the requirements of the outer circle on the axis of the swing is also very strict. To ensure the quality of this type of work, it must have a good top hole. If the top hole taper inaccuracy, gloss less than ▽ ▽ ▽ 9 or more; especially the workpiece after quenching the top hole will be deformed, if not Johnson, the quality of the workpiece is difficult to guarantee. Therefore, the need to finish the axis of the workpiece, the top hole should be over grinding. I used to drill the top hole in the factory, is the top of the lathe made of cast iron into the low efficiency,