在我厂近年来的产品设计中，有些零件采用ＺＬ１１１合金砂铸，其形状复杂，壁厚相差较大，或是厚大平板类铸件。每年的梅雨季节也正是大批量生产的时候，铸件加工后有气孔、缩孔、针孔等缺陷，相当一部分零件因此而报废。如图１所示便为一个典型的例子。该零件的图１铸件... In our factory in recent years, product design, some parts using ZL111 alloy sand casting, the shape of complex, large wall thickness difference, or thick flat castings. The annual rainy season is also the time of mass production, casting porosity, shrinkage, pinhole defects, a considerable part of the parts so scrapped. As shown in Figure 1 is a typical example. The parts of Figure 1 casting ...