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一、问题的提出 我厂自八二年以来,每年都有几十万件用于水表的罩子、螺母、接管等的铅黄铜铸件生产任务,年铸件毛坯总量200吨以上。八三年八月采用中频感应炉熔炼后,铜铸件的质量波动很大,特别是G2“螺母外六方面经初冲后,各面不同程度出现针眼状气孔缺陷,严重时成批报废。虽放宽检验标准,八四年度废品率仍达60～75％。为此,我们决定对针孔缺陷严重的G2”螺母进行专题试验。现在,已使针孔缺陷得到控制,保证了生产任务的完成。
First, the issue put forward I plant since 1982, every year hundreds of thousands of pieces for the water meter cover, nuts, brass plumbing and other lead casting production tasks, the total castings in excess of 200 tons. In August 1983, the quality of copper castings fluctuated greatly after the induction furnace was melted. After the initial punching of the G2 “nut, the pinhole-like stomatal defects appeared on different sides and were rejected in serious cases. Although the inspection standards were relaxed, the scrap rate still reached 60-75% in FY04. To this end, we decided to conduct a special test on the G2 ”nuts with severe pinhole defects. Pin holes have now been brought under control, ensuring the completion of production tasks.