触发开关是触发引信的主要部件。某触发开关装配到整机后在振动试验中出现早炸故障。通过金相检验和能谱分析等方法对触发开关的失效原因进行了分析。结果表明: 触发开关印制板镀钯层存在缺陷, 开关内存在异物导致了接触电阻异常的故障。并且通过试验确定了合理的镀金层厚度, 结合实际完善了触发开关制造工艺过程, 制定了预防触发开关失效的综合控制措施。

Trigger switch is the main part of trigger fuse. A trigger switch was assembled to the trigger fuse, which brought misacting before the normal bomb time in vibration test. The failure reason was analyzed by means of metallographic examination and energy spectrum analysis. The results showed that the main reasons were cladding material defects and unexpected existence. The reasonable thickness of gold layer and better process were promoted, and the comprehensive control measures for avoiding the trigger switch failure were given.