Electric heating – Metal heating – Of cylinders
Patent
1986-05-05
1988-03-01
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1057, 219 1049R, 219 1067, 148147, 148150, 266127, 266129, H05B 640, H05B 614
Patent
active
047287616
ABSTRACT:
Method and apparatus for inductively heating and quench hardening axially spaced cams on a steel camshaft having a longitudinally extending rotational axis concentric with a plurality of axially spaced bearings, which method and apparatus utilizes an induction heating coil having an inner surface surrounding the rotational axis of the camshaft with an insulating gap and integral quench openings for directing quenching liquid inwardly from the heating coil for the workpiece, and a high frequency power supply for selectively energizing the heating coil with a power density within the heating coil of about 20KW/in.sup.2 and an auxiliary cooling assembly fixed with respect to the heating coil and including an arrangement for spraying a cooling liquid toward the camshaft. In accordance with the method and apparatus, a camshaft is indexed axially through the opening of the coil and cooling assembly to a first position with a cam within the coil, at which position the camshaft is indexed to have the lobe of the cam facing the gap in the induction heating coil and a hardening cycle is then employed including induction heating of the surface of the camshaft while the cam is stationary and then quench hardening by directing a quenching fluid through the induction heating coil toward the previously heated cam surface. After this heating cycle, the camshaft is then moved until the next cam is within the heating coil and the previously hardened cam is in the cooling assembly. Thereafter, another hardening cycle occurs. This process is repeated until all cams have been hardened.
REFERENCES:
patent: 2295777 (1942-09-01), Denneen
patent: 3622138 (1971-11-01), Kostyal
patent: 3784780 (1974-01-01), Laughlin et al.
patent: 3944446 (1976-03-01), Bober
patent: 4059795 (1977-11-01), Mordwinkin
patent: 4230987 (1980-10-01), Mordwinkin
patent: 4604510 (1986-08-01), Laughlin et al.
Lengyel, "Post Grind Hardening", SAE Technical Paper, Series No. 860231, Feb. 1986.
Johnson Robert C.
Laughlin John R.
Mucha George M.
Nelson William Z.
Leung Philip H.
Tocco, Inc.
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