一、制订标准的必要性和可能性:汽车修理生产在我国已经有较长的历史了,但是凸轮轴作为发动机的一个重要零件,在大多数修理企业中实现较完善(即高质量)的修理,却只有十多年的时间。其主要原因是凸轮轴修理比其他零件要复杂一些,凸轮表面是一个特殊形状的曲面,要恢 I. The Necessity and Possibility of Setting Standards: Automobile repair production has a long history in our country. However, the camshaft, as an important part of the engine, achieves better (ie, higher quality) repair in most repair shops , But only ten years time. The main reason is that camshaft repair is more complex than other parts, the cam surface is a special shape of the surface to be restored