An Adaptive Pressbrake Control for Strain-Hardening Materials

[+] Author and Article Information
K. A. Stelson

Intelligent Machines Laboratory, Productivity Center, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Eng. Ind 108(2), 127-132 (May 01, 1986) (6 pages) doi:10.1115/1.3187047 History: Received May 16, 1985; Online July 30, 2009


An improved adaptive pressbrake control algorithm is described. The problem is to control the punch reversal position of the press so that the final unloaded angle of the bend remains unchanged in the presence of material property and thickness variations of the sheets or plates being bent. Pressbrake control algorithms that use punch force-displacement data to identify thickness and material property variations have shown promise. However, since previous controllers have been based on an elastic-plastic material model, the parts have been overbent. In this paper, a controller based on an elastic, power-law strain-hardening model is proposed. Experiments have shown that the model eliminates the tendency to overbend the parts that is present in the elastic-plastic algorithm.

Copyright © 1986 by ASME
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