Abstract: In view of the fracture of the suspension spiral spring occurred in the truck production process, through the establishment of the fault tree to identify the risk event and the item-by-item analysis of the identification bottom event, it is determined that the technological process is not perfect and the production process does not meet the process requirements. The overwear phenomenon occurs in the end face grinding, and the rectification measures are adopted to reduce the end face cutting amount of the spiral spring, increase the tempering process and refine the grinding process parameters. The fatigue test of the improved product is carried out, the problem of end face fracture of the spiral spring is solved, and the performance and service life of the spiral spring are improved.

Key words: Fracture of spisral spring; Martensite; Tempering treatment

摘要： 针对卡车生产过程中发生的悬架螺旋弹簧断裂问题，通过建立故障树识别风险事件， 对识别底事件逐项分析，确认工艺流程不完善及生产过程不符合工艺要求。在端面磨平时出 现过磨现象，采用减少螺旋弹簧端面切割量、增加回火工序、细化磨削工艺参数的整改措施， 对改进后的产品开展了疲劳试验等验证，解决了螺旋弹簧端面断裂问题，提高了螺旋弹簧的 性能和使用寿命。

关键词: 螺旋弹簧断裂；马氏体；回火处理