用MAGMA模拟软件辅助球墨铸铁轮毂工艺设计

MAGMA Simulation Software Assisted Process Design of Nodular Iron Wheel

介绍了球墨铸铁轮毂的原生产工艺,X射线探伤检验和机械加工后发现表面有缩松缺陷。用MAGMA数值模拟软件对原生产工艺的凝固过程进行模拟分析,根据模拟分析结果,提出了改进方案:将冒口直径由75 mm增加至100 mm,同时在轮毂铸件被补缩部分两侧各增加厚度为5 mm的补贴,延长冒口的补缩时间,保证轮毂铸件被补缩部分与冒口之间的补缩通道畅通。生产结果显示:改进后的工艺达到了消除球墨铸铁轮毂铸件缩松缺陷的目的,虽然工艺出品率由74%左右降低至55%左右,但能够满足供给客户高质量产品的要求。

The original production technology of nodular iron hub was introduced. X-ray flaw detection and machining showed that the surface had shrinkage defect. MAGMA numerical simulation software was used to simulate the solidification process of the original production process. According to the results of simulation analysis,the improved scheme was proposed：increase the riser diameter from 75 mm to 100 mm,and increase the thickness by 5 mm on both sides of the feeding part of the wheel hub casting,prolong the feeding time of the riser to ensure that the feeding channel between the feeder and the riser was clear. The results showed that the improved technology achieves the purpose of eliminating the shrinkage defects of nodular cast iron wheel hub castings. Although the production rate was reduced from about 74% to about 55%,it could meet the requirements of supplying high quality products to customers.