Digital Gap Monitor and Adaptive Integral Control for Auto-Jumping in EDM

[+] Author and Article Information
W. M. Wang, K. P. Rajurkar

Nontraditional Manufacturing Research Center, University of Nebraska-Lincoln, Lincoln, NE 68588

K. Akamatsu

Mitsubishi Electric Corp., Japan

J. Eng. Ind 117(2), 253-258 (May 01, 1995) (6 pages) doi:10.1115/1.2803302 History: Received February 01, 1993; Revised April 01, 1994; Online January 17, 2008


This paper reports a monitoring and adaptive integral control strategy for EDM to regulate the cycle time of the periodical retraction (jumping) of the tool electrode according to the gap condition. A digital EDM gap monitor has been developed to detect the time ratios of gap states with a resolution of 0.2 μs. The theoretical and experimental analysis of the effect of sensing parameter combinations on control aspects and performance of manual setting, integral control and adaptive integral control methods have been carried out. Experimental verification shows that the proposed system results in higher erosion rate, better machining stability, and complete avoidance of arc damage.

Copyright © 1995 by The American Society of Mechanical Engineers
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