Manufactured Part Modeling for Characterization of Geometric Variations of Automotive Spaceframe Extrusions

[+] Author and Article Information
Yu (Michael) Wang, S. Gupta

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

F. L. Hulting, P. S. Fussell

Alcoa Technical Center, Aluminum Company of America, Pittsburgh, PA 15069

J. Manuf. Sci. Eng 120(3), 523-531 (Aug 01, 1998) (9 pages) doi:10.1115/1.2830155 History: Received November 01, 1995; Revised April 01, 1997; Online January 17, 2008


This article presents a method for characterizing geometric shape variations in manufactured automotive spaceframe extrusions using measurement data obtained by a Coordinate Measurement Machine (CMM). With a manufacturing perspective, a modeling scheme is proposed for representing the actual shape of the extrusions. Systematic deviations in the geometry of the parts from their theoretically perfect design description models are described by the critical parameters of their manufactured part models (MPMs), which are constructed by fitting CMM data through an optimization. The manufactured part model can then be interpreted in a meaningful way for improving bending process as well as quantifying the process capability. An application of the methodology is illustrated through the analysis of experimental data for rotary draw bent extrusions used in the aluminum intensive automobiles.

Copyright © 1998 by The American Society of Mechanical Engineers
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