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开发了基于有限元增量理论和BWC壳单元的型材拉弯模拟算法。本算法对型材拉弯机构中夹钳的运动进行了深入分析。采用速度约束的方法来模拟夹钳的运动轨迹,并对夹钳所在板料位置上的节点进行约束处理,保证了夹钳速度加载的正确性。以矩形截面型材拉弯零件为例,采用文献中的夹钳运动加载方案对其进行型材拉弯成形模拟。将本算法计算的结果与文献中的试验结果进行对比,可以验证本算法在型材拉弯成形模拟中的计算精度。
A profile bending simulation algorithm based on finite element incremental theory and BWC shell element was developed. The algorithm analyzes the movement of the clamp in the profile bending and bending mechanism deeply. The speed constraint method is used to simulate the movement path of the clamp, and the restraining of the nodes on the position where the clamp is located ensures the correct loading of the clamp speed. In this paper, a rectangular cross-section profile bending part is taken as an example to simulate the profile bending and bending process using the clamp loading scheme in the literature. Comparing the result calculated by this algorithm with the experimental results in the literature, we can verify the accuracy of this algorithm in the simulation of profile forming.