The blank design and spring back control of a stamping die by using the bi-arc surface model

In this paper, a bi-arc surface model is proposed to fit the scanned point clouds of a stamped part obtained by the reverse engineering. The proposed model is capable of obtaining more uniform curvature distribution than the fitting of NURBS surface. The proposed bi-arc surface model is easier to meet and control the parameters of the face of golf head. The specifications for the horizontal and the vertical arc radii design are retrieved from the scanned data. The integration of bi-arc surface model and energy method is proposed to design a developed blank. The springbacks of the trimmed parts of the different blank and die designs have been analyzed. The maximum amounts of springback of using a regular square blank and a developed blank design are 0.6 and 0.14 mm, respectively. The further design of using drawbeads can lower the springback to the amount of 0.05 mm. The proposed bi-arc surface model can maintain the design parameters and integrate the energy method to obtain a better developed initial blank. The springback control of the developed contour blank is better than the square blank design.