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采用刚塑性有限元法对2017铝合金等通道转角挤压(ECAP)进行热力耦合的数值模拟,分析了模具外角(0~50°)对ECAP过程中载荷、工件中等效应变及其均匀性和工件温度的影响。研究结果表明:随着模具外角增大,载荷峰值和等效应变迅速下降,然后下降幅度越来越小,降至30°左右均趋于稳定;而等效应变的均匀性则随着模具外角增大先提高后略有降低,在模具外角为20°时应变均匀性最好。随着模具外角增大,工件整体温度一直下降,降幅越来越小。
The rigid-plastic finite element method (FEM) was used to simulate the thermo-mechanical coupling of channel aluminum alloy (ECAP) such as 2017 aluminum alloy. The effects of external angle (0 ~ 50 °) on ECAP loading, workpiece equivalent strain and uniformity Effect of workpiece temperature. The results show that with the increase of the external angle of the die, the peak load and equivalent strain drop rapidly, and then decrease more and more slowly, and then decrease to about 30 °. Both of them tend to be stable. However, Increased slightly increased first increased slightly lower, the best uniformity of strain in the mold angle of 20 °. With the mold outside the angle increases, the overall temperature of the workpiece has been declining, the decline is getting smaller and smaller.