Development of a Magnetostrictive Torque Sensor for Milling Process Monitoring

[+] Author and Article Information
Hiro Ohzeki, Akihiro Mashine

Mitsubishi Materials Corporation, Intelligent Machine System Development Center, 1-297, Kitabukuro-cho, Omiya-shi, Saitama 330-8508, Japan

Hideki Aoyama, Ichiro Inasaki

Keio University, 3-14-1, Hiyoshi Kohoku-ku, Yokohama-shi 223-8522 Japan

J. Manuf. Sci. Eng 121(4), 615-622 (Nov 01, 1999) (8 pages) doi:10.1115/1.2833078 History: Received December 01, 1996; Revised January 01, 1999; Online January 17, 2008


This paper deals with a sensor system based on the magnetostrictive effect which is installed in a tool holder for sensing cutting torque in order to monitor the milling process. Changes in the magnetic permeability of ferromagnetic alloy layers formed onto a rotating shaft due to torque are detected by coils as changes in impedance without contacting the rotating shaft. By mounting the magnetostrictive sensor on a tool holder, it has become possible to detect cutting torque as close to the cutting point as possible. The accuracy of the proposed sensor system is confirmed through static and dynamic evaluation tests. In order to investigate the relationship between tool failure and cutting torque, cutting tests were performed. As the results, the possibility of estimating flank wear and tool fracture from cutting torque detected by the proposed sensor system is recognized.

Copyright © 1999 by The American Society of Mechanical Engineers
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