汽车镁合金发动机支架压铸工艺的优化设计

Optimization of die-casting process design for automotive magnesium alloy engine support brackets

结合实际生产,针对某款车型的镁合金发动机支架的压铸成型工艺,采用数值模拟方法,设计并优化了其浇注系统及压铸工艺参数,进行了压铸试验和组织性能评估。正交模拟试验得到最佳工艺参数:浇注温度为690℃、模具温度为220℃、压射速度4.8 m/s。X光探伤和力学性能检测表明,在此工艺参数下,成型性良好,铸件组织致密,抗拉强度为254.44 MPa、屈服强度为232.71 MPa、伸长率为7.33%;硬度为77.07 HBS;底座最大压缩变形量为0.08 mm。检测结果均满足性能要求。

Combined with practical production a die-casting process for producing magnesium alloy engine support brackets of a model of automobiles was designed. The gating system and process parameters were optimized by means of numerical simulation. Verification by experiments and evaluation of cast product microstructure and properties were also performed. Through carrying out orthogonal simulation experiments optimum process parameters were obtained as: pouring temperature 690 ℃ mold temperature 220 ℃ and injection speed 4.8 m/s. Results of X-ray defect detection and mechanical property test indicated that under the condition of the optimized process parameters castings with excellent formability and dense microstructure were obtained whose tensile strength yield strength elongation and hardness were 254.44 MPa 232.71 MPa 7.33% and 77.07 HBS respectively. The maximum compressible reduction amount of the bracket base was 0.08 mm and all the test results met the specification requirements.