Apparatus and method for case hardening steel tools by applicati

Details Apparatus and method for case hardening steel tools by applicati Apparatus and method for case hardening steel tools by applicati

1976-02-25

1978-08-22

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

148147, 219 1077, 219 1043, 219 1057, H05B 504

Patent

active

041091272

ABSTRACT:
A high frequency oscillator is pulsed on and off to create at least a first and second pulse to be applied by inductive heating to a steel tool which has not previously been heat treated. The pulse width, amplitude and interval between pulses are adjusted for a given alloy and then kept constant during the production run. A Hartley oscillator with a frequency above 10 MHz is utilized and the pulses have pulse widths of less than 100 milliseconds.

REFERENCES:
patent: 2371459 (1945-03-01), Mittelman
patent: 2400472 (1946-05-01), Strickland
patent: 2935433 (1960-05-01), Pribyl
patent: 3178324 (1965-04-01), Grange et al.
patent: 3240639 (1966-03-01), Lihl
patent: 3332036 (1967-07-01), Kappenhagen et al.
patent: 3748425 (1973-07-01), Potter
patent: 3763343 (1973-10-01), Rocklin
patent: 3806690 (1974-04-01), Frungel
Tudbury, "Basics of Induction Heating", 1960, vol. I, pp. I-66, I-68, vol. II, pp. II-74.

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