电加热成型梯形弹簧是一个重要零件,要求具有较全面、较优良的性能,除必须进行严格的热处理外还需经喷砂、磷化处理,成品检验时均测负载和24小时静压试验。由于该弹簧在使用过程中所受应力较大,在装配时或在短时间使用后就有发生断裂的现象。为此,我们对梯形弹簧的断裂原因进行了分析。断裂情况与断口宏观检查观察了一些断裂的梯形弹簧,它们的断裂情况大致相似。我们选择了四种较典型的断口,由图1～4可以看出弹簧断口大致都呈45度断裂,显然它是属于正 Electric heating forming trapezoidal spring is an important part, requires a more comprehensive, more excellent performance, in addition to the need for strict heat treatment in addition to sandblasting, phosphating, finished product testing load and 24 hours hydrostatic pressure test. As the spring in the process of using the stress, in the assembly or after a short period of time there is the phenomenon of fracture. For this reason, we analyze the reason of the fracture of the trapezoidal spring. Fracture and Fracture Macroscopical Inspection Several fractured trapezoidal springs were observed and their fracture behavior was approximately similar. We chose four more typical fracture, can be seen from Figure 1 ~ 4 Spring fracture roughly 45 degree fracture, it is clear that it belongs to the positive