球形铸件由于热节圆直径大,在砂型铸造生产中,常常出现缩孔、缩松、缩陷等缺陷,影响铸件质量。我厂通过采用在铸型型腔中交叉插数根铁钉或细圆条的方法,取得了较好的效果,成品率由62％上升到98％。如某一φ120mm球形铸件,操作时,我们在上下型腔中均匀分布地插置了6～10根4～5in的铁钉或插入6根左右φ(4-6)×(95～115)mm的圆铁条。(铁钉或圆条的插入数量和具体尺寸,可根据铸 Due to the large diameter of the hot pitch circle, spherical castings often have defects such as shrinkage cavity, shrinkage and shrinkage in the production of sand casting, affecting the quality of castings. I plant through the use of the mold cavity in the cross-cut insert a few nails or thin round of the method and achieved good results, the yield increased from 62% to 98%. Such as a φ120mm ball casting, operation, we are evenly distributed in the upper and lower cavity inserted 6 to 10 4 ~ 5in iron nails or insert about 6 φ (4-6) × (95 ~ 115) mm Round iron bars. (The number of nails or bars inserted and the specific size, according to cast