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根据钢轨矫直断裂的形貌、夹杂物和微观组织的分析以及翻钢机实际工作状态,确定钢轨发生矫直断裂过程为:由于翻钢机上夹持辊打开滞后且较慢,钢轨轨头踏面与翻钢机上夹持辊之间产生了滑动摩擦,造成钢轨踏面局部产生了冷变形组织,严重部位产生高温并快速冷却,形成冷形变硬化组织,在后续矫直过程产生裂纹,并造成钢轨断裂。通过清理翻钢机设备状态,优化翻钢工艺,消除了由该原因造成的钢轨矫直断裂现象。
According to the morphology of rail straightening rupture, the analysis of inclusions and microstructure as well as the actual working state of the steeping machine, the straightening rupture process of the rail is determined as follows: due to the hysteresis of the holding roller on the steerer and its slowness, the rail head tread And the tipping machine roll friction generated between the friction, resulting in the rail tread locally produced cold deformation of the organization, severe parts of the high temperature and rapid cooling, the formation of cold deformed hardened tissue, the subsequent straightening process to produce cracks and cause rail rupture . By clearing the condition of the turning machine and optimizing the turning technology, the rail straightening and rupture caused by this reason is eliminated.