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我们车间最近做一批拖拉机小零件,其中某些零件有细长的坭心(如图),开始做时全部报废,原因是坭心太小,气体很难排出,当铁水浇进后就往外打呛,因此浇一个
Recently, a small batch of tractor parts were made in our workshop. Some of the parts were slender, as shown in the picture. They were scrapped at the beginning because the heart was too small and the gas was hard to be discharged. Choke, so pour one