Performance of Sheet Metal In a Bending Die.
Authors: Y E Ling, Associate Professor H P Lee, Dr B T Cheok.
For queries, please contact H P Lee
Department of Mechanical & Production Engineering, National University of Singapore
9 Engineering Drive 1, Singapore 117576. Fax (65) 7791459 / Email :

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The performance of sheet-metal in a bending die is dependent on many die configuration parameters. Currently, these parameters are assigned by the die designer based on heuristics and past experience. To achieve the bend specifications required, a vast amount of time and resources are expended at the "debugging" stage where the physical die is tested, and modifications to the die configuration are made physically in an iterative manner until the desired results are achieved. This debugging stage is getting more costly and time consuming as part tolerance gets tighter. This project is a systematic study of how changes in die configuration parameters affect the performance of sheet-metal in a bending die. It involves the study and understanding of the mechanics involved in the bending of sheet-metal, modeling and simulating the behavior of the sheet-metal in a CAE software. There will be comparative study between CAE results and actual shop-floor results to help validate the CAE model. The project should help to provide a better understanding of how sheet-metal behaves in a bending die. These findings can be very useful to the precision engineering trade. This project involves the study of a 90-degree L-bend with a step in the die, with interest in springback, bend allowance, pressure pad force and residual stress in the workpiece.

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(c) Copyright 2001 Professor F. R. Hall - University of Wolverhampton.