大型薄壁复杂铝合金油底壳低压铸造过程数值模拟研究

Numerical Simulation Research of Casting Process for Large-scale Complex Thin-wall Aluminum Alloy Case

利用CASTsoft软件对大型薄壁复杂铝合金油底壳低压铸造充型和凝固过程进行数值模拟。模拟结果表明,由于壁厚不均匀且多处壁厚较大,在凝固过程中,油底壳壁厚较大且凝固较晚的部位产生了缩孔缩松等铸造缺陷。在改进方案中,采用增加冒口补贴和内浇道补缩通道来强化铸件缺陷部位的补缩,并在铸件相应位置配合使用冷铁。再次模拟结果表明,改进后的方案合理可行,获得了无铸造缺陷高质量的铸件。

The filling and solidification process of large-scale complex thin-wall aluminum alloy case casting in low-pressure casting process were simulated using CASTsoft software. The simulation results indicate that casting defects such as shrinkage cavity and shrinkage porosity appeared during solidification, in the alloy case where the wall is thickness and solidification is late because of the alloy case has many thickness and uneven wall. In the modified craft process, riser subsidies and feeding channel gate was increased to strengthen the feeding of the casting defect parts, cold iron was also added to the casting at the right place. The modified process was re-simulated, simulation results show that the improved process is feasible, high quality casting with no casting defects was acquired.