模拟技术在激冷铸铁凸轮轴铸造工艺优化中的应用

针对凸轮轴铸造过程中出现的缩孔缺陷,根据铸造工艺理论,结合计算机辅助设计并利用View Cast软件对原始工艺进行模拟,发现缺陷主要由于金属液在型腔中的流动速度太大,容易形成卷气。为了使型腔自下而上逐级顺序进行充型,将原来的封闭式浇注系统变成开放式浇注系统,即在浇口处形成一个阻流截面以减小金属液在型腔中的流动速度。模拟结果显示,该工艺能有效消除缩孔且对模具的修改量少,已经在实际中应用,并实现了批量化生产。

Application of Simulation on Process Optimization of Chill Cast Iron Camshaft

Considering the shrinkage void of chill cast iron camshaft in casting process,the original technology is calculated by View Cast combined with the CAD(computer aided design) based on theory of casting technique.The results show that the main reason of defects is the high velocity.In order to fill two shafts one by one,the original technology positive-pressure gating system is changed into unchoked running system which filling in the order of down mould first and upper mould second.A choked flow section is f...