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铸件表面夹砂,是湿型铸造生产中普遍存在的一种缺陷。我厂从生产东方红28型拖拉机以来,在几个大铸件上(如265公斤传动机构箱,110公斤汽缸体,离合器外壳等)严重存在着夹砂问题。以1963年4~12月份的统计,传动机构箱中,因夹砂而报废的就占20%,废品相当惊人,影响生产的顺利进行。几年来,我们在解决夹砂方面走过很多弯路,曾采用各种方法,直到1964年5月试验成功活化膨润土型砂应用于生产后,才彻底地消灭了夹砂。活化膨润上型砂在我厂生产中经过半年多的考验,实践证明它是解决温型铸件表面夹砂的有效方法。
Sand casting surface, wet casting is the production of a common defect. I plant from the production of Dongfanghong 28 tractors since, in a few large castings (such as 265 kg transmission box, 110 kg cylinder block, clutch housing, etc.) serious sand problems. According to the statistics from April to December 1963, in transmission box, 20% was scrapped due to sand inclusion, and the scrap was rather alarming, which affected the smooth progress of production. Over the years, we have taken many detours in the solution to the problem of sand inclusion and used various methods until the successful activation of bentonite sand in May 1964 was applied to the production to completely eliminate sand inclusion. Activated swelling upper sand production in our plant after more than six months of test proved that it is an effective way to solve the temperature-type casting sand surface.