优化生产工艺解决台车体冷裂缺陷

Optimizing Production Process to Resolve Cold Cracking Issues in Railcar Bodies

某钢厂200m^(2)烧结生产线台车体生产中出现冷裂问题,裂纹主要出现在车体竖梁、轴孔和加强筋板交汇处。分析其原因为,铸件凝固过程中液态停留时间较长,导致球化效果衰退,抗拉强度和延展性显著降低,当车体内部应力超过抗拉强度且延展性较低时从而引发冷裂。针对该问题提出改进措施,包括降低浇注温度、使用高效球化剂,以及优化工艺浇注系统,这些措施均有效减小了内部应力,去除了冷裂缺陷,提高了台车体的质量。通过这些改进措施,成功完成了后续200件台车体的生产,不再出现冷裂缺陷,并取得了明显的生产效益。本研究的案例研究为类似问题的解决提供了有益的经验和启示。

The problem of cold cracking occurred in the production of 200 m^(2) sintering production line of a steel plant.The cracks mainly appeared at the intersection of vertical beam,shaft hole and reinforced plate of the car body.The reason is that the liquid residence time in the solidification process of the casting is long,resulting in the decline of spheroidization effect,and the tensile strength and ductility are significantly reduced.When the internal stress of the car body exceeds the tensile strength and the ductility is low,cold cracking is caused.To solve this problem,the improvement measures are put forward,including reducing the pouring temperature,using high efficiency nodule agent,and optimizing the process pouring system.All these measures effectively reduce the internal stress,remove the cold crack defect,and improve the quality of the car body.Through these improvement measures,200 car body has been successfully piouduced,and cold crack defect,has been removed and obvious production benefits have been achieved.