Method of inductively heating and quench hardening camshafts

Details Method of inductively heating and quench hardening camshafts Method of inductively heating and quench hardening camshafts

1975-05-22

1976-03-16

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148146, 148150, 148153, C21D 930

Patent

active

039444465

ABSTRACT:
A method of inductively heating and quench hardening an elongated camshaft having a central axis, an elongated body portion, at least three axially spaced bearing surfaces on the body portion, and axially spaced cam surfaces on the body portion and encircling the axis, this method comprises: providing a generally cylindrical multi-turn inductor having an elongated workpiece receiving opening extending in a given direction, rotatably mounting the camshaft in the workpiece receiving passage, rotating the workpiece about its given axis, energizing the inductor with a high frequency alternating current, continuing the energizing and rotating step until the surfaces are inductively heated to a quench hardening temperature, removing the workpiece from the workpiece receiving opening, clamping the workpiece on at least three of the bearing surfaces for rotation about a quench axis corresponding to the camshaft central axis, restraining at least three clamped bearing surfaces from transverse movement, and then quenching the clamped and restrained camshaft with a quenching liquid while the camshaft is being rotated to prevent undue distortion and cracking of the camshaft.

REFERENCES:
patent: 3662995 (1972-05-01), Armstrong

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