Design of a Vernier Punch and Die Set for Single-Minute Bending Set-Ups

[+] Author and Article Information
R. H. Sturges

Department of Mechanical Engineering and the Robotics Institute Carnegie Mellon University

J. Mech. Des 117(3), 396-401 (Sep 01, 1995) (6 pages) doi:10.1115/1.2826692 History: Received October 01, 1993; Revised December 01, 1994; Online December 11, 2007


An opportunity is found to reduce set-up time in sheet metal panel bending tasks by deliberately leaving gaps between a segmented punch to allow passage of a bent flange or to adjust the distance between articulated die sections for re-entrant bends. The effects of this practice on part appearance and dimension is addressed to assure part quality. Unconstrained bending in the gap area is modelled, and the gap/thickness ratio is found to be an indicator of part geometry and subjective quality. A zero set-up punch and die set is described for 4-bend parts.

Copyright © 1995 by The American Society of Mechanical Engineers
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