我厂自1962年接受试制国家急需的船用离心泵任务,这些产品中90％以上是有色合金的复杂铸件,我厂广大职工遵照毛主席关于“独立自主,自力更生”的方针,群策群力解决了锡青铜的铸造关键。几年来,在解决锡青铜铸件质量问题上,我们经历了一段曲折的道路。最初所做的铸件,除缩孔、缩裂等铸造表面缺陷外,切除冒口后,断面上有很多红色、棕色、灰色的夹杂物,经机加工后,小孔密布,一试水压,到处都漏,造成成批报废,严重影响任务完成。有的铸件浇注后冒口表面不但不 Since 1962, our factory has been entrusted with the task of trial manufacture of marine centrifugal pumps urgently needed by the country. Over 90% of these products are complex castings of non-ferrous alloy. According to Chairman Mao’s principle of “independence and self-reliance” by Chairman Mao, our factory solves the problem of tin bronze Casting key. In the past few years, we have gone through a tortuous path to solving the problem of the quality of tin bronze castings. The initial castings, in addition to shrinkage, shrinkage and other casting surface defects, after removal of the riser, the section has a lot of red, brown, gray inclusions, after machining, holes covered, a test pressure, Leakage everywhere, resulting in batches of scrapped, seriously affecting the task is completed. Some castings after pouring surface not only not