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对54Si Cr6卷簧后做疲劳性能检测时发现弹簧未达标准便疲劳断裂,对疲劳断裂弹簧和缠簧原料进行综合分析,结果表明:弹簧疲劳失效的主要原因是原料表面存在严重不均匀脱碳,且混晶加速了54Si Cr6弹簧疲劳失效。在生产过程中应严格控制钢坯加热和退火温度及其均匀性,杜绝光亮材表面存在脱碳;为防止混晶,应杜绝采用小减面率拉拔+磨光工艺生产,恢复剥皮生产工艺,杜绝钢坯高温、长时间加热,合理控制终轧温度。
The fatigue test of 54Si Cr6 coil spring shows that the spring fails to reach the standard and then breaks the fatigue. The fatigue fracture spring and the raw material of the wound spring are analyzed comprehensively. The results show that the main cause of spring fatigue failure is the serious nonuniform decarburization , And mixed crystal accelerated 54Si Cr6 spring fatigue failure. In the production process should be strictly controlled billet heating and annealing temperature and its uniformity, to prevent decoloration of bright surface materials exist; in order to prevent mixed crystal, should be eliminated by the use of a small reduction rate drawing + polishing process production, recovery stripping production process, Prevent the billet temperature, prolonged heating, reasonable control of the finishing temperature.