可控气压下镁合金消失模铸造工艺参数的研究

Investigating on Parameters of Mold Filling in Magnesium Alloy EPC Process Under Controlled Pressure

研究了模样密度、涂层厚度、浇注温度、真空度等工艺参数对可控气压下镁合金消失模铸造时液态金属的充填形态和充型速度的影响,以及充型速度与充型形态之间的关系。结果表明:在可控气压下镁合金消失模铸造过程中,液态镁合金呈拱形平稳向前推进,并随着泡沫模样密度的降低、涂层厚度的减小、浇注温度和真空度的提高,充型速度提高。各因素对充型速度的影响效果由大到小的顺序是:泡沫模样密度→涂层厚度→浇注温度→真空度。通过分析实验数据,建立了可控气压下镁合金消失模铸造的充型速度的非线性数学模型。

A series of experiments are made to explore the influence of processing parameter including the pattern density, coating thickness, pouring temperature and vacuum on mold filling in the magnesium alloy expendable pattern casting (EPC) under controlled pressure. The results obtained indicate that the metal fills quickly with a smoothly, slightly convex metal front profile. The metal filling velocity increases with the reduction of pattern density and coating thickness, and the increase of pouring temperature and vacuum. The pattern density is the most effective parameter to melt velocity in this process. A mathematics model has been established to illustrate the effect of processing parameters on the metal filling velocity.