选用4A11铝合金,利用挤压铸造技术生产汽车空调器摇盘.当浇注温度为740℃,模具预热温度280℃,施加的压力1 900 kN,即比压为139.45 MPa时,摇盘的力学性能最好.在最佳工艺参数条件下,摇盘的强度σb为310～330 MPa;维氏硬度HV0.1为100～110;延伸率能达到9%,摇盘的微观组织良好,Si颗粒分布均匀,无严重粗化现象,摇盘表面及内部无冷隔、气孔、缩孔、裂纹等缺陷.通过对拉伸断口分析,进口制件和最佳工艺下形成的制件都具有韧窝断口特征,进口制件断口韧窝较多,其相对塑性较高,最佳工艺条件下制件的韧窝较大.
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