C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
327/21
C21D 9/30 (2006.01) C21D 1/10 (2006.01)
Patent
CA 1047122
METHOD OF INDUCTIVELY HEATING AND QUENCH HARDENING CAMSHAFTS Abstract of the Disclosure A method of inductively heating and quench hardening an elongated camshaft is disclosed; and wherein the camshaft has an elongated body portion, with a plurality of axially spaced bearing surfaces on the body portion, and axially spaced cam surfaces on the body portion. This method comprises the steps of 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 the bearing surfaces for rotation about a quench axis corresponding to the camshaft central axis; restraining the 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.
241810
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