Accommodation of Springback Error in Channel Forming Using Active Binder Force Control: Numerical Simulations and Experiments

[+] Author and Article Information
M. Sunseri, J. Cao, A. P. Karafillis, M. C. Boyce

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139-4307

J. Eng. Mater. Technol 118(3), 426-435 (Jul 01, 1996) (10 pages) doi:10.1115/1.2806830 History: Received December 21, 1994; Revised September 24, 1995; Online November 27, 2007


Springback in a forming process is due to the elastic deformation of the part during unloading. This manufacturing defect can be accounted for through proper tooling design or through proper design and control of the magnitude and history of restraining force. Using finite element analyses of the process: (1) the effects of restraining force on the springback phenomena when stamping channels from aluminum sheet are investigated; (2) a strategy to control the binder force during the forming operation in order to reduce springback and simultaneously avoid tearing failure is described; and (3) a binder force control strategy which provides robustness in the presence of process parameter uncertainty is implemented. The process history and controller designed using finite element analyses is then experimentally verified: excellent agreement between simulation and experiments is obtained. A binder force history, which leads to a significant reduction in the amount of springback incurred by the formed part without reaching critical stretching conditions, was proposed. Although an optimal forming history was found, in order to ensure that part shape error remained minimized even in the event of variations in processing parameters such as friction, a closed-loop control algorithm was developed whereby the binder force is altered during the process in order to provide a robust, repeatable stretching history. Experiments were performed using a double-action servo-controlled process and were found to produce the desired results demonstrating both the accuracy of the numerical simulation and the success of the proposed active-binder force control method to obtain net shape.

Copyright © 1996 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In