铝合金汽车支架零件挤压铸造工艺参数优化

Parameter Optimization of Squeezing Casting Process for Aluminum Alloy Automobile Support Parts

为研究铸造过程中浇注温度及保压压力对ADC12铝合金铸件缩孔缩松及力学性能产生的影响,采用Pro CAST软件对挤压铸造充型和凝固过程进行数值模拟。采用间接挤压铸造成形某汽车发动机固定支架零件以获得较高的力学性能。通过模拟分析结合力学性能测试以及金相组织观察,确定浇注温度为680℃、保压压力为150 MPa、模具温度为250℃,且保压压力对消除铸件缩孔缩松缺陷、改善铸件显微组织、提升铸件力学性能起主导作用。

In order to investigate the effects of casting temperature and holding pressure on shrinkage and porosity and mechanical properties of ADC12 aluminum alloy castings,ProCAST software was used to simulate the filling and solidification process of squeezing casting.A fixed support part of an automobile engine was produced by indirect squeezing casting to obtain desirable mechanical properties.Through simulation analysis,mechanical properties testing and metallography observation,the satisfied process parameters were determined as follows:Casting temperature of 680℃,holding pressure of 150 MPa and mold temperature of 250℃.Moreover,the holding pressure plays a domi⁃nant role in eliminating shrinkage and porosity defects of castings,improving microstructure and enhancing the mechanical properties of castings.