一、研究变形的必要性近几年来的修理实践发现,许多总成,尽管把各组成零件磨损了的部位加以修复,恢复了原来的尺寸、形状和配合,但组装后却不能达到预期的效果,常常是达不到对总成的技术要求。投入使用之后,寿命往往缩短一半左右。例如,某工程机械修理厂修理的变速箱,把全部齿轮变成新件之后仍有不正常响声,把全部轴和轴承也都换成新件之后,响声仍不消失。最后,只好让它带着响声出厂了。经进一 First, the need to study the deformation of the repair practice in recent years found that many assembly, although the parts of the various parts of the wear to be repaired, restore the original size, shape and fit, but the assembly can not achieve the desired effect It is often not up to the technical requirements for the assembly. After being put into use, the life span is often reduced by about half. For example, the gearbox repaired by a construction machinery repair shop still has abnormal noise after turning all the gears into new ones. After all the shafts and bearings are replaced with new ones, the noise still does not disappear. In the end, it had to leave the factory with a sound. Jingyi