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RESEARCH PAPERS

Force Sensors Embedded in Surfaces for Manufacturing and Other Tribological Process Monitoring

[+] Author and Article Information
H. Du, B. E. Klamecki

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455-0111

J. Manuf. Sci. Eng 121(4), 739-748 (Nov 01, 1999) (10 pages) doi:10.1115/1.2833131 History: Received November 01, 1995; Revised January 01, 1999; Online January 17, 2008

Abstract

The measurement of tooling-workpiece interface forces is needed for process design, process modeling and analysis and process monitoring for control. One approach to measuring local interface loads with minimal disturbance of the surface and process is to embed sensors in the surface below the surface region of interest. Small piezoelectric sensing elements were cast into surfaces and their ability to measure loads applied normal to the surfaces was assessed. Sensor outputs were analyzed in terms of sensor depth below the surface, distance along the surface from the load location to the sensor location and sensor to sensor spacing. A mechanical model of the sensor-surface system was developed which predicted sensor output. The use of this sensing concept and type of sensor was demonstrated in strip drawing tests. Using temperature compensated sensors, workpiece holddown force was measured in tests during which drawbead penetration was varied.

Copyright © 1999 by The American Society of Mechanical Engineers
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