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RESEARCH PAPERS

Real-time Compensation for Time-variant Volumetric Errors on a Machining Center

[+] Author and Article Information
J. S. Chen, J. X. Yuan, J. Ni, S. M. Wu

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Eng. Ind 115(4), 472-479 (Nov 01, 1993) (8 pages) doi:10.1115/1.2901792 History: Received February 01, 1991; Revised December 01, 1992; Online April 08, 2008

Abstract

An error compensation system has been developed to enhance the time-variant volumetric accuracy of a 3-axis machining center by correcting the existing machine errors through sensing, metrology, and computer control techniques. A general methodology has been developed to synthesize both the geometric and thermal errors of machines into a time-variant volumetric error model. Instead of the well-known 21 geometric error components, 32 machine linkage errors are formulated as a 4D error field including the space domain and the time domain. Different types of models are proposed for different kinds of thermal error components. A compensation controller based on an IBM/PC has been linked with a CNC controller to compensate for machine errors in real time. This scheme has been implemented on a horizontal machining center and has been shown, using metrology instruments, to improve the machine accuracy by an order of magnitude. A cut workpiece inspected using a coordinate measuring machine (CMM) has also shown that dimension errors have been reduced from 92.4 μm to 18.9 μm in a dimension of 404 × 310 mm2 and the depth difference of milled surfaces has been reduced from 196 μm to 8 μm.

Copyright © 1993 by The American Society of Mechanical Engineers
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