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复杂汽车结构件多工位级进模具有工位多、结构复杂、工位关联性强的特点,其冲裁工位刃口线受成形工位的影响,刃口线的预测精度低。基于此,提出一种基于应变路径的精确刃口线优化方法。采用有限元逆算法对零件分步展开,获得板料的初始轮廓线;基于真实压力机参数、精细化模面和真实工艺参数,对条料进行全工序精细化数值模拟。将板料初始网格的边界节点基于B样曲线拟合,提取成形前后边界节点的应变及其路径。以设计零件的产品边界为目标,建立精确刃口线优化的目标函数,通过调整B样条曲线,对轮廓线进行迭代优化。实例表明,该优化方法可有效提高复杂多工位级进模刃口线优化的精度和效率。
The multi-station progressive die of complex automotive structural parts has the features of many stations, complicated structures and strong station correlation. The cutting edge of blanking stations is affected by forming stations, and the prediction accuracy of edge lines is low. Based on this, an accurate method of edge line optimization based on strain path is proposed. The finite element inverse algorithm was used to expand the part step by step, and the initial contour of the sheet metal was obtained. Based on the real press parameters, the fine die surface and the real process parameters, the whole process was numerically simulated. Based on the B-like curve fitting, the boundary nodes of the initial grid are extracted and the strain and its path of the boundary nodes before and after forming are extracted. With the goal of designing the product boundary of the part, an objective function of accurate edge line optimization is established. By adjusting the B-spline curve, the contour line is iteratively optimized. The example shows that the optimization method can effectively improve the accuracy and efficiency of the optimization of multi-station progressive die edge line optimization.