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为解决镁合金超薄外壳件压铸成形性差的难题,通过正交试验研究了浇注温度、模具温度和压射速度对铸件力学性能的影响。结果表明,当浇注温度为700℃、模具温度为210℃、压射速度为5m/s时,铸件的力学性能最佳。采用SEM对拉伸试样断口进行分析,发现铸件内部疏松、缩孔的数目随浇注温度升高而减少,在浇注温度为700℃时,抗拉强度和屈服强度分别达到242.6 MPa和220.6 MPa。
In order to solve the problem of poor formability of magnesium alloy ultrathin shell parts, the effects of pouring temperature, mold temperature and casting speed on the mechanical properties of the castings were studied by orthogonal experiments. The results show that when the pouring temperature is 700 ℃, the mold temperature is 210 ℃ and the shot velocity is 5m / s, the mechanical properties of the castings are best. SEM was used to analyze the fracture of the tensile specimen. It was found that the internal porosity and the number of shrinkage cavity decreased with the increase of pouring temperature. The tensile strength and yield strength reached 242.6 MPa and 220.6 MPa respectively at pouring temperature of 700 ℃.