有些零件如传动齿轮,经长期运行而齿面加工刀痕依然保持原始状态,这是由于齿轮运转过程中表面形成油膜的缘故,可见零件表面形成油膜的性能(即润滑性能),也是标志加工表面质量的一项重要内容。在同样工作条件下表面光洁度愈高,愈易形成油膜,但除此以外,表面形貌对油膜的形成具有重大作用。 Some parts such as transmission gears, long-term operation of the tooth surface machining cut remains the original state, which is due to the formation of oil film surface during the operation of the gear, showing the formation of oil film parts surface performance (ie, lubrication), but also mark the processing surface An important part of quality. In the same working conditions, the higher the surface finish, the easier the formation of oil film, but otherwise, the surface morphology of the formation of oil film has a major role.