板材多道次渐进折弯成形回弹补偿的模具修正

金属板材多道次渐进折弯因回弹使成形后的工件形状与目标存在误差.文中借鉴单一道次冲压成形模具型面修正的思路，将模具型面的位移修正、平滑的位移修正以及成形传递函数法应用到多道次渐进折弯成形的模具修正，实现回弹补偿.实验结果表明，基于单一道次冲压的闭环成形传递函数法用于多道次渐进折弯模具修正可快速有效提高成形工件精度.

Die Face Correction Method for Springback Compensation of Sheet Metal Incremental Air-Bending Forming

There exist errors between the made workpieces and the CAD models owing to the springback of sheet metal incremental air bending forming. To reduce these errors, three die face correction methods for single step stamping (displacement adjustment method, DAM; smooth displacement adjustment method, SDAM; deformation transfer function method, DTFM) were applied to the multiple step incremental air bending forming. With these methods, the die surfaces of sheet metal incremental air bending forming are properly corrected to compensate for springback. It is manifested by the experimental results of workpieces formed with three different die face correction algorithms that the die face correction method of closed loop forming based on experimental iteration can effectively improve the forming accuracy of workpieces.