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我们对 ZQMI-500/33管报废品作了全面调查,客观分析,抓住了质量问题的实质——“管内慢性放气”。因为我们的全部工作重点是放在解决慢性放气的问题上,所以最后整个攻关项目也就迎刃而解了,并取得了预期的效果。由于我们工艺上的不完善及生产组织不当,使之零部件去气不彻底;加上零部件周转期较长(在各工序停留时间较长),排气工艺(包括设备)保证不了对零部件的彻底除气等等,各方面的因素造成了出厂管中有很大一部分管子存在着先天性的不足:即在工作过程中管内有局部的放气源存在。开始时,可能表现得还不十分严重,所以在厂内的老练初测和复测尚能顺利的通过。但等发往用户后,又存放了一
We conducted a comprehensive investigation of ZQMI-500/33 pipe scrap, objective analysis, to grasp the essence of the quality problem - “chronic deflation in the pipe.” Because all of our work is focused on solving the problem of chronic deflation, the entire project has finally been solved and the desired effect has been achieved. Due to our imperfect process and improper production organization, the gas components are not completely degassed. In addition, due to the long turnaround time of parts and components (longer residence time in each process), the exhaust gas technology (including equipment) can not guarantee zero Parts of the complete degassing, etc., in all aspects of the factory tube has a large part of the tube there is a congenital deficiency: that is, in the work process there is a local tube deflation source exists. At the beginning, may not be very serious performance, so sophisticated in the factory first test and retest can still be successfully passed. However, after being sent to the user, another one is stored