机床X轴上导轨铸造工艺的改进

Casting Method Improvement of X-Axis Upper Guiding Rail of Machine Tool

简要介绍了机床导轨铸件的结构、技术要求及原铸造工艺,为解决铸件工艺出品率低、砂铁比高的问题,进行了工艺改进,并利用数值模拟软件对新工艺的充型和凝固过程进行模拟分析。最优工艺方案为:无箱造型,开放式浇注系统,横浇道为变截面,采取立浇方法;浇注速度控制在0.9 m/s左右。生产结果显示,夹渣、气孔、缩松等铸造缺陷得以消除,铸件合格率达到98%以上。

The configuration of the machine tool guiding rail,its technical requirements and original casting method were briefly introduced.In order to solve the problem that casting process yield rate was low,sand/metal ratio was high,the casting method improvement was carried out and the numeral simulation software was used to simulate and analyze the mold filling process and solidifying process.The optimized casting method was： adopting flaskless molding,non-pressured gating system and ranner bar with changing sections;adopting vertical pouring,the pouring rate was kept as about 0.9 m/s.The production result showed that the casting defects such as slag inclusion,blowhole,shrinkage cavity and so on were eliminated and the qualified rate of casting reached 98% and higher.