Method of monitoring induction heating cycle

Details Method of monitoring induction heating cycle Method of monitoring induction heating cycle

1988-12-14

1990-01-30

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1077, 219 1057, 324233, 266 80, H05B 606

Patent

active

048975184

ABSTRACT:
A method of monitoring a heating cycle of an induction heating system wherein an inductor encircles a metal workpiece and an alternating current is applied through the inductor from a power supply during the heating cycle. This method comprising the steps of generating an analog signal representative of the voltage across the inductor, as the voltage varies during the heating cycle by changes in the electromagnetic characteristics of the workpiece as the workpiece is being heated; digitizing the voltage representative analog signal; creating a trace of the digitized voltage representative analog signal, with the trace being indicative of the electromagnetic characteristic of the workpiece as sensed by the inductor voltage during the heating cycle; and, comparing the created trace with a preselected pattern. This method can be performed with the workpiece moving through the inductor during said heating cycle and when the heating cycle includes a number of sub-cycles when the power supply is energizing the inductor separated by periods when the power supply is not energizing the inductor.

REFERENCES:
patent: 3743808 (1973-07-01), Kasper
patent: 3888405 (1975-06-01), Jones et al.
patent: 4059795 (1977-11-01), Mordwinkin
patent: 4230987 (1980-10-01), Mordwinkin
patent: 4317980 (1982-03-01), Goodrich et al.
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patent: 4570230 (1986-02-01), Wilson et al.
patent: 4618125 (1986-10-01), Balzer
patent: 4651283 (1987-03-01), Sciaky et al.
patent: 4683361 (1987-07-01), Driggers
patent: 4816633 (1989-03-01), Mucha et al.
Mordwinkin et al., "New Induction QC Method Uses Eddy Current Principle", Heat Treating, Nov. 1986.

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