通过工艺设计优化降低4A缸体废品率

Reduce the Scrap Rate of 4A Cylinder by Process Design

针对4A缸体在生产中出现的砂眼、黏砂、漏水等问题,通过优化工艺设计,采用精益生产理念,将原工艺的上下箱颠倒,对砂芯易黏砂部位剥离出来,选用粒度140/70的覆膜砂,并浸涂专用的防黏砂涂料。结果表明,黏砂问题彻底解决,废品率从24.60%下降至6.28%。

In view of the sand inclusion, burn-in sand defect, block leaking and other defects in the production of 4 A cylinder block, casting process design of 4 A cylinder block was optimized. The upper and bottom molds in the original design were reversed, the sand core easy to cause burn-on was separated and made specially using 140/70 mesh coated sand and dipped by resistant burn-in and burn-on coating. lean production was applied in the production. The results showed that sand burn-in and burn-on defects were completely eliminated, and the casting rejection rate decreased from24.6% to 6.28%.