Intelligent Real-Time Predictive Diagnostics for Cutting Tools and Supervisory Control of Machining Operations

[+] Author and Article Information
K. Ramamurthi

Process Design and Control, Semiconductor Process and Design Center (SPDC), MS 944, POB 655012, Texas Instruments Inc., Dallas, TX 75265

C. L. Hough

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843

J. Eng. Ind 115(3), 268-277 (Aug 01, 1993) (10 pages) doi:10.1115/1.2901660 History: Received April 01, 1992; Revised August 01, 1992; Online April 08, 2008


Machining economics may be improved by automating the replacement of cutting tools. In-process diagnosis of the cutting tool using multiple sensors is essential for such automation. In this study, an intelligent real-time diagnostic system is developed and applied towards that objective. A generalized Machining Influence Diagram (MID) is formulated for modeling different modes of failure in conventional metal cutting processes. A faster algorithm for this model is developed to solve the diagnostic problem in real-time applications. A formal methodology is outlined to tune the knowledge base during training with a reduction in training time. Finally, the system is implemented on a drilling machine and evaluated on-line. The on-line response is well within the desired response time of actual production lines. The instance and the accuracy of diagnosis are quite promising. In cases where drill wear is not diagnosed in a timely manner, the system predicts wear induced failure and vice versa. By diagnosing at least one of the two failure modes, the system is able to prevent any abrupt failure of the drill during machining.

Copyright © 1993 by The American Society of Mechanical Engineers
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