A356铝合金挤压铸造过程数值模拟与试验验证

Numerical Simulation and Experiment Validation of Squeeze Casting of A356 Aluminum Alloy Components

借助ProCAST软件,对A356铝合金构件挤压铸造过程进行了数值模拟研究。结果表明,凝固从铝熔体与模具的接触面开始,拐角区中心处最后凝固。随浇注温度和模具温度升高,凝固时间增加,但比压的增加导致凝固时间缩短。拐角区等效应力最大,中心区等效应力最小。随浇注温度和模具温度升高,最大等效应力下降。最优工艺参数:浇注温度为680~720℃,模具温度为200~300℃,比压大于200MPa。成形试验表明,在优化工艺参数下,成形件充型完整,表面品质高,组织致密,无铸造缺陷。

Numerical simulation of squeeze casting A356 aluminum alloy component was performed by the ProCAST software.The results show that solidification of component started from the contact surface between aluminum melt and die.The final solidification location is located at the center of corner of wheel model.Solidification time is increased with an increase of pouring temperature and die temperature,however it is decreased with an increase of specific pressure.Maximum effective stress occurrs in the corner of component,while the central region has the minimum effective stress.With the increase of pouring temperature or die temperature,maximum effective stress is decreased.The optimized process parameters were presented such as pouring temperature of 680~720℃,die temperature of 200~300℃and specific pressure of more than 200 MPa by numerical simulation.The results of the validation experiment show that A356 aluminum alloy components with desirable surface quality,complete filling and absence of defects can be produced successfully via squeeze casting under the optimized process parameters.