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为揭示桥形件成形时的塑性流动规律,利用三维有限元模拟软件对不同高宽比条件下的成形过程进行了仿真模拟和对比分析,并确定了初步的挤压成形工艺方案。研究结果表明:在该锻件的变形过程中,当凸模压下量S分别为10.71、21.41和28.90 mm时,S=21.41 mm时的等效应变分布、等效应力分布皆较为均匀,此时,窄桥宽度W=20 mm、高宽比H/W=3.15的桥形件的等效应变差值最小,等效应力最大值最低。应用本文模拟和试验的成形工艺参数和方案,可一次成形得到尺寸和性能皆符合产品要求的桥形锻件。
In order to reveal the law of plastic flow during the formation of bridge parts, the forming process under different aspect ratios was simulated, compared and analyzed by using the 3D finite element simulation software, and the initial extrusion process scheme was confirmed. The results show that the equivalent strain distribution and the equivalent stress distribution are both uniform at the S = 21.41 mm when the reduction of the punch S is 10.71, 21.41 and 28.90 mm, respectively. In this case, The narrow bridge width W = 20 mm, the aspect ratio H / W = 3.15 bridge the equivalent strain difference minimum, the minimum equivalent stress minimum. Application of this article simulation and test the forming process parameters and programs, can be a shape and size to meet the performance requirements of the bridge forgings.