运用均衡凝固理论解决机床工作台缩松缺陷

Solution to the Shrinkage Defects in Machine Tool Bed Castings Using Proportional Solidification Theory

机床工作台是厚大断面灰铁铸件，台面厚度在80～120mm之间，在生产过程中非常容易出现T型槽缩松缺陷，通过运用均衡凝固技术进行工艺改进，充分利用厚壁灰铸铁的自补缩功能，消除了铸件的缩孔和缩松缺陷。批量生产证明，铸件废品率由15％左右降为0。

In the production of heavy section （80～120 mm） machine tool bed castings made of gray shrinkage defects often appear in the ＂T＂ grove.type, Experiments were carried out to eliminate shrinkage defects using proportional solidification theory in which self-feeding of heavy section gray is fully used to feed the casting, Volume production has shown that original 15% scrap rate has been totally eliminated using the proportional solidification theory.