郑州煤矿机械厂加工薄壁类零件出现圆度超差现象,是长期遗留下来的问题。如加工的导向套(套类零件的一种,在千斤顶中起导向作用)与缸体装配时,出现导向套三点及缸体周边磨伤现象。分析原因是导向套出现正三棱变形所致,而正三棱 Zhengzhou Coal Mine Machinery Factory processing thin-walled parts appear excessive roundness phenomenon, is a long-term legacy of the problem. Such as the processing of the guide sleeve (sets of parts of a kind of play a leading role in the jack) and the cylinder assembly, the guide sleeve appears three points and the cylinder around the abrasion phenomenon. The reason for the analysis is that the guide sleeve is caused by the deformation of the regular trigonometry, and the regular trigonometry