一次,车间试验高压软管时,发现有两根软管在接头收口螺帽处漏油。拧紧后再试验仍然漏油。为了查明原因,便将螺帽剖开,发现螺帽内表面与蓝图不符,多了一个台阶。原来加工螺帽内孔时需要多次进刀,而有的进刀不到位造成台阶,或刀尖有缺口未及时发现,仍然进行加工,致使内孔出现台阶。检验人员又未对零件逐个认真进行检查,使有故障的螺帽“混进”了合格品中。 Once, the workshop test high-pressure hose, it was found that there were two hoses in the joint closure nut leakage. After tightening, the test still leaks oil. In order to find out the reason, the nut will be cut open and found that the inner surface of the nut and the blueprint does not match, one more step. The original processing nut bore requires multiple feed, and some feed is not in place to cause the stairs, or the tip of the notch was not found in time, still processed, resulting in a hole in the stage. The inspectors did not inspect the parts one by one seriously, so that the faulty nut “mixed in” qualified products.