BLANK SHAPE PREDICTION BASED ON FLATTENING APPROACH OF 3D COMPLEX SURFACES PRODUCED BY DIGITIZED DIES

Abstract

AbstractOne of the most important and well-known problems in sheet metal based industries is the blankdesign of complex 3D curved surfaces. Blank design determines both shape and size of the incipientblank. This paper introduces an inverse method for converting the given 3D curved surface of theproduct to its planar shape. The develped planar shape is based on changing the position of controlpoints that determines the shape of the curved surface. The material is assumed to obey pure sheardeformation mechanism to simplify the processing and to estimate the direction of motion of thesecontrol points. The devised method is a multi-step scheme to come up with the deformation steps ofsuch surfaces. The blank thickness distribution was nominated as a process parameter toqualitatively judge the performance of the presented method using FEM technique. The resultsshow that the presented method is a very subtle way in predicting the blank shape so that thethickness is evenly distributed across the predicted blank compared with conventional methods.The results also show that the presented method is a detour to simulate the deformation steps.