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柴油机使用一段时间后,常出现曲轴轴颈失圆的情况,尤其连杆轴颈这种现象更为多见,给修理工作造成困难。许多机手是靠手工锉和用砂布打磨。这种方法有三大弊病:一是手锉不能保持均匀对称,即修后的轴颈还是不圆;二是砂布打磨后,表面看来很光亮,其实并不圆滑平整;三是尺寸无法掌握,因轴瓦与轴采用分级配合,锉修难以得到合适的配合尺寸,往往还须刮瓦,而刮瓦又会降低轴瓦的使用寿命。因此这样修复后的机器使用不可
After a period of diesel engine, crankshaft journal often appear out of round the situation, especially the connecting rod journal this phenomenon is more common, causing difficulties to the repair work. Many of the machines are made of hand-filled and emery cloth. This method has three major drawbacks: First, the file can not be kept evenly symmetrical, that is, after the repair of the journal or not round; second emery polished, the surface is very bright, in fact, not smooth; Third, the size can not grasp, Due to the tie bearing and shaft with grading, file repair difficult to get the appropriate size, often have to scratch the tile, and scraping the tile will reduce the service life of the bearing. Therefore, after the repair of the machine can not be used