This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Generate Tooling Mesh by FEM Virtual Forming Model for Springback Compensation in Die Surface Design of Sheet Metal Stamping
Annotation ability available
Sector:
Language:
English
Abstract
An iterative FEM algorithm has been recently developed to compensate for springback in die surface design of sheet metal stamping. In each iteration of this algorithm, a new set of tooling mesh needs to be generated based on the part geometry after the so called “spring-forward” deformation. This geometry is represented by finite element mesh of the blank. Without CAD files, regular mesh generators can not handle the task. This paper presents a technique to generate such tooling mesh by means of a finite element calculation. After the spring-forward simulation, a virtual forming model is constructed. The virtual die and virtual punch are made from the part mesh with material changed from deformable to rigid. The virtual workpiece is generated by copying the die mesh and changing rigid material to deformable. The virtual workpiece is placed in between the virtual punch and the virtual die and then a FEM calculation is conducted to press the virtual workpiece into the shape of the virtual die. The needed new tooling mesh can then be easily obtained from the deformed virtual workpiece. The new tooling mesh generated by this technique has the same configuration as the original tooling mesh and preserves geometric features of the part design, so that the CAD engineers who receive the modified die surface geometry in the form of FEM mesh can work on the files with ease.
Authors
Topic
Citation
Wu, L., "Generate Tooling Mesh by FEM Virtual Forming Model for Springback Compensation in Die Surface Design of Sheet Metal Stamping," SAE Technical Paper 960592, 1996, https://doi.org/10.4271/960592.Also In
References
- Wu, L. “Application of Dynamic Relaxation Method to the Prediction of Springback & Residual Stress in Sheet Metal Forming,” Computer Applications in Shaping & Forming of Materials, Proc. of a Symposium by the Shaping and Forming Committee, Annual Meeting of TMS Denver, Colorado 23 40 Feb. 21-25 1993
- Wu, L. “Springback and Residual Stress Analysis for Sheet Metal Forming Processes by Dynamic Relaxation in Conjunction with Finite Element Method,” Proc. of 4th ICTP Beijing, China 1840 1845 Sept. 5-9 1993
- Du, C. Zhang, L. Wang, N. M. “Springback Prediction in Sheet Forming Simulation,” SAE International Congress & Exposition Detroit, Michigan 113 123 Feb. 28 Mar. 3 1994
- Joannic, D. Gelin, J.C. “Accurate simulation of springback in 3D sheet metal forming processes,” Proc. of NUMIFORM'95 Ithaca, New York 729 734 June 18-22 1995
- Karafillis, A.P. Boyce, M.C. “Tooling and binder design for 3-D sheet metal forming processes using springback calculations,” Proc. of NUMIFORM'95 Ithaca, New York 581 586 June 18-22 1995
- Wu, L. Du, C. Zhang, L. “Iterative FEM Die Surface Design to Compensate for Springback in Sheetmetal Stampings,” Proc. of NUMIFORM'95 637 642 Ithaca, New York June 18 - 21 1995