7075铝合金流变压铸数值模拟及实验研究

发布时间：2018-05-09 06:10

  本文选题：铝合金 + 流变压铸　； 参考：《稀有金属》2017年11期

【摘要】：7075铝合金强度接近钢铁,被认为是实现以铝代钢的首选材料,在汽车轻量化中发挥的作用越来越大。但是该合金铸造过程极易产生组织与成分不均匀等缺陷,采用普通铸造方法很难成形完好的铸件。开展了7075铝合金螺旋电磁搅拌制浆及流变压铸成形工艺研究,实现短流程和低成本。采用数值模拟和试验研究相结合的方法,首先采用Magmasoft软件对7075铝合金汽车连杆铸件的充型和凝固过程进行模拟优化,在此基础上进行了流变压铸试验研究。研究结果表明现有的计算模型能够很好地反映7075合金在不同压铸参数条件下的充型和凝固过程,压射速度3 m·s-1、模具温度150℃时可以获得无缺陷的铸件;用优化后的工艺参数进行7075铝合金连杆件流变压铸和普通压铸试验结果对比分析:流变压铸件显微组织细小均匀,平均晶粒尺寸为34μm;普通压铸件显微组织粗大不均匀,平均晶粒尺寸为59μm;与普通压铸件相比,流变压铸件合金元素(Zn,Mg,Cu)的成分偏析小,布氏硬度提高HB 19。
[Abstract]:The strength of 7075 aluminum alloy is close to that of iron and steel, and it is considered to be the preferred material to realize Aluminum-substituted steel, and it plays an increasingly important role in automobile lightweight. However, it is easy to produce defects such as uneven microstructure and composition in the casting process of the alloy, so it is difficult to form the well-formed castings by ordinary casting methods. The technology of helical electromagnetic stirring pulping and rheological die casting of 7075 aluminum alloy was studied to realize short process and low cost. By using the method of numerical simulation and experimental study, the mold filling and solidification process of 7075 aluminum alloy automobile connecting rod castings were simulated and optimized by Magmasoft software, and the rheological die casting test was carried out on this basis. The results show that the existing calculation model can well reflect the filling and solidification process of 7075 alloy under different die-casting parameters. The casting without defects can be obtained at the injection rate of 3ms-1 and the temperature of the die at 150 鈩，

本文编号：1864904