This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A New Multi-point Active Drawbead Forming Die: Model Development for Process Optimization
Annotation ability available
Sector:
Language:
English
Abstract
A new press/die system for restraining force control has been developed in order to facilitate an increased level of process control in sheet metal forming. The press features a built-in system for controlling drawbead penetration in real time. The die has local force transducers built into the draw radius of the lower tooling. These sensors are designed to give process information useful for the drawbead control.
This paper focuses on developing models of the drawbead actuators and the die shoulder sensors. The actuator model is useful for developing optimal control methods. The sensor characterization is necessary in order to develop a relationship between the raw sensor outputs and a definitive process characteristic such as drawbead restraining force (DBRF).
Closed loop control of local specific punch force is demonstrated using the die shoulder sensor and a PID controller developed off-line with the actuator model.
Authors
Citation
Bohn, M., Jurthe, S., and Weinmann, K., "A New Multi-point Active Drawbead Forming Die: Model Development for Process Optimization," SAE Technical Paper 980076, 1998, https://doi.org/10.4271/980076.Also In
References
- Harsch, E. Neumann, C.-P. Hindersmann, M. 1996 Umformtechnik - Vorsprung durch Innovation th 1996 115 144
- Hardt, D. E. Boyce, M. C. Fenn, R. C. Sim, H. B. “Enhanced sheet Forming Using Real-time Control of Blankholder Force” Int. Conference on Sheet Metal Birmingham, U.K. April 7-9 1992
- Siegert, K. CNC Hydraulic Multipoint Blankholder System for Sheet Metal Forming Presses CIRP Annals 42 1 1993 319 322
- Wang, Y.-W. Saeedy, S. A. Majlessi, S. A. Beard, J. E. Strain Path Effects on the Modified FLD Caused by Variable Blank Holder Force SAE Paper No. 950695 Detroit, Michigan 1995 35 44
- Siegert, K. Ziegler, M. Pulsating Blankholder Force SAE Paper No. 970987 Detroit, Michigan 1997 249 259
- Cao, J. Boyce, M. C. Draw Bead Penetration as a Control Element of Material Flow SAE Paper No. 930517 Detroit, Michigan 1993 145 153
- Michler, J. R. Weinmann, K. J. Kashani, A. R. Majlessi, S. A. A Strip-drawing Simulator with Computer-controlled Drawbead Penetration and Blankholder Pressure J. Mater. Process. Technol 43 1994 177 194
- Michler, J. R. Bohn, M. L. Kashani, A. R. Weinmann, K. J. Feedback Control of the Sheet Metal Forming Process Using Drawbead Penetration as the Control Variable Trans. NAMRI/SME XXIII 1995 71 76
- Bohn, M.L. Michler, J. R. Weinmann, K. J. A New Concept for a Hydro-Mechanical Press Conversion for Sheet Metal Forming Research Paper MF96-126, NAMRC XXIV Ann Arbor, Michigan 1996 95 99
- Kernosky, S. K. Weinmann, K. J. A Sensing System for Real Time Control of the Sheet Metal Drawing Process Trans. of the NAMRI/SME XXV 1997 37 41
- Michler, J. R. The Drawbead as a Control Element in Sheet Metal Forming Michigan Technological University 1994 74 75
- Kernosky, S. K. Transducers for Die Shoulder Friction Studies and Real Time Control of the Drawing Process Michigan Technological University 1996 176 185