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文章对HXN5型机车活塞销开裂原因进行了分析。分析表明,由于该活塞销在渗碳后淬火冷却介质选择不当,在活塞销内孔表面形成微裂纹,该微裂纹在活塞销使用过程中扩展,造成活塞销开裂。
The article analyzes the reason of cracking of piston pin of HXN5 locomotive. The analysis shows that due to improper selection of the quench cooling medium of the piston pin after carburizing, micro-cracks are formed on the inner surface of the piston pin bore, which microcracks expand during use of the piston pin, causing the piston pin to crack.