关键词: 螺旋弹簧断裂；马氏体；回火处理

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