Springback Analysis and Control in Small Radius Air Bending

[+] Author and Article Information
K. L. Elkins

Roadway Information Technology, Inc., Akron, OH 44309-3518

R. H. Sturges

Dept. of Mechanical Engineering, Dept. of Industrial & Systems Engineering, Virginia Tech, Blacksburg, VA 24061-0238

J. Manuf. Sci. Eng 121(4), 679-688 (Nov 01, 1999) (10 pages) doi:10.1115/1.2833103 History: Received December 01, 1997; Revised September 01, 1998; Online January 17, 2008


A critical factor for quality small lot sheet metal production is the control of flange angles. For small radius pressbrake bending operations, i.e., punch radius less than sheet thickness, control of angle requires extensive setup time, making small batch runs inefficient. This paper demonstrates the use of relatively simple measurements of material properties to provide the information necessary to estimate and control springback with accuracy approaching 1/4 degree. The control method combines the generality of a modelbased approach with accurate on-line loaded angle measurement. An analytic bending model is developed which provides insights into the material and geometric variables that affect springback. Estimates are made of the relative sensitivity of springback to changes in these variables. In addition, a set of variable ratios are determined which are linearly related to springback and thus serve as the input data for a linear regression model of springback based on experimental results.

Copyright © 1999 by The American Society of Mechanical Engineers
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