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1S47622N#55946933

Abstract:

Abstract. This paper provides an analysis of the Rigid Body Motion (RBM) in multi-stage Single Point Incremental Forming of a cylindrical cup. The RBM is studied using Digital Image Correlation to track the material in each contour of the tool, resulting in a better understanding of the RBM phenomenon than has been shown in literature. The study shows that the highest Z-translations of the midpoint of the cone take place in the last contours of each stage, where these RBM peaks also increase per stage. An interesting observation is a reverse rigid body motion, appearing in the contours close to the end of a stage, right before the sudden drop of the bottom in the last contours. This causes flattening of the bottom of the cone and results in a smaller RBM per stage for the later forming stages. Additionally, the stepover between two intermediate stages has been shown to have an important effect on the stepped features appearing in the bottom, but did not have a significant effect on the accuracy of the midpoint of the cone.