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从实用角度论述了铁型覆砂铸造球铁件的气缩孔、夹渣、砂眼三种缺陷的外貌特征、形成机理及其防止措施。
From the practical point of view, the appearance characteristics, formation mechanism and prevention measures of the three kinds of defects of iron sand mold cast iron ductile iron were studied.