Indication of cutting tool wear by monitoring eddy currents indu

Details Indication of cutting tool wear by monitoring eddy currents indu Indication of cutting tool wear by monitoring eddy currents indu

1989-08-28

1991-10-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

73104, 324202, 324222, 324226, 324227, 324232, 324238, G01N 2780, G01N 2790, G01R 3312

Patent

active

050599054

ABSTRACT:
A tool dullness indicator and method comprising the measurement of eddy currents at a known, controlled frequency directly in the tool by measuring the phase angle shift in a coil when a sample is put into or next to the coil. The phase angle change caused by presence of a workpiece is measured when the tool is sharp to provide a reference reading taking into account the surface hardness and other bulk properties of the workpiece, and arriving at a parameter that is dependent on eddy current changes, such as phase angle shift or other measurable changes related to eddy currents in the part, and then analyzing the workpiece, either while working, or at a set programmed check time to determine when the tool is dull as a function of the change in eddy current characteristics caused by work hardening.

REFERENCES:
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patent: 4854161 (1989-08-01), Drits
"New Tool-Wear Sensors Aid Adaptive Machining", Joseph C. Quinlan, Dec. 1987, Tooling & Production, pp. 41-43.
"Measuring Cutting Tool Wear On-Line: Some Practical Considerations", Jul. 1984, Manufacturing Engineering, pp. 55-60.

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