Abstract: 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. 

Key words: sheet metal incremental air-bending forming, springback compensation, die face correction, closed-loop forming