镁合金石膏型熔模真空浇注压力凝固成形的研究

Study on Plaster Mould Investment Casting of Magnesium Alloy to Casting in Vacuum and to Solidify with Pressure

实验研究了镁合金石膏型熔模真空浇注压力凝固过程,分析了真空度、浇注温度对镁合金流动性的影响以及凝固压力、操作时间与镁合金拉伸性能的关系。结果表明,高真空度下提高浇注温度,既可解决镁合金氧化问题,又可使镁合金液在石膏型中获得很好的充型。凝固压力越高,操作时间愈短,得到的铸件组织越致密,镁合金铸件拉伸性能愈高。

By means of experiments, this research studies the solidifying process of type melt model of magnesium alloy to casting in vacuum and to solidify with pressure which includes the effect that the vacuum degree, the casting stage and the pouring temperature has on the fluiding of magnesium alloy and the relation among solidifying pressure, solidifying stage, manipulation time and tensile performance of magnesium alloy. The research indicates that if the temperature becomes higher in the condition of high vacuum, it can not only solve the problem of magnesium oxidation, but also the magnesium liquid has a better form in the gypsum type. The higher the solidifying pressure is, the shorter the time for manipulation are, the compacter organize become and the higher the tensile performance of castings are.