大型高铝锌基合金轴瓦铸造工艺优化

Processing Optimization of Large Zn Based Alloy Bearing Bush

利用华铸CAE/Inte2CAST10.0软件对大型锌基合金轴瓦铸件的温度场进行了凝固模拟,预测了缩孔、缩松倾向及出现位置,探讨金属型冷却水流速、冷却时间对凝固液相、温度梯度分布及缩孔、缩松的影响,在此基础上分析了实际铸造过程中缩孔、缩松缺陷产生的原因;并根据模拟结果对铸造工艺进行了优化。结果表明,在内腔采用水冷金属型的同时在轴瓦底部放置冷铁,从底部和内表面两个方向同时对热节进行冷却,可以达到消除轴瓦缩孔、缩松的目的。

Numerical simulation of temperature field in solidification process of large Zn based bearing bush was carried out to predict potential shrinkage porosities (holes) and its potential position in the parts and to understand effects of flow velocity of cooling water in permanent mold and cooling time on liquid phase solidification,temperature gradient distribution and shrinkage porosities (holes).Based on simulated result,origination of shrinkage porosities (holes) occurred in the practical products was described.And the processing optimization was conducted.The practical production verifies that shrinkage porosities (holes) can be eliminated by setting chill at the bottom of water cooling permanent mold casting bearing bush to cool hot spot from the bottom and inner surface simultaneously.