用普通砂箱手工造型时,上下砂箱扣箱必须靠箱壁上的标记来对准。这样扣箱时很麻烦,同时还不容易对得很准。自从1956年学习了苏联基洛夫工厂使用砂型稳钉的经验后,不但简化了扣箱工序,而且提高了铸件质量。 With ordinary sand box hand modeling, the upper and lower flask deduction box must be marked on the box to align. This cumbersome cumbersome box at the same time is not easy to be very accurate. Since 1956 I learned the experience of using sand-type studs in the Kirov factory in the Soviet Union, which not only simplified the process of deduction but also improved the quality of castings.