自1968年以来,我厂用流态砂造型,生产了各种机床零件上万件,总重量近万吨,铸件内外废品总和都是5%左右,七年多的生产实践充分证明用流态砂造型,是一种多、快、好、省的方法。现仅就我厂生产实践的体会,谈谈流态砂造型常见的铸造缺陷及其防止措施。 1.缩孔:又称缩沉、缩空等。缩孔大部分产生在铸件顶面、冒口根部、铸件的厚大部位。缩孔的形状不大规则,孔内粗糙并有树枝状结晶组织。缩 Since 1968, our factory has used fluid sand molding to produce thousands of machine tool parts with a total weight of nearly ten thousand tons. The sum of the scrap inside and outside the casting is about 5%. The production practice of more than seven years fully proves that the use of fluid Sand modeling, is a multi-fast, good, provincial method. Now only my experience in production practice plant, talk about the flow of sand molding common casting defects and prevention measures. Shrinkage: also known as shrinkage, shortening and so on. Shrink most of the castings produced in the top, riser root, thick castings. Shrinkage is not the shape of the rules, the hole rough and dendritic crystalline structure. Shrink