Tocco, Inc.

Other

Michael R Hammond

Robert V Vickers

Donald E Novorsky

An induction heating system and method of using the same are described. The system includes a locator system that eccentrically positions the central axis of the internal central void of the work piece with respect to the central axis of the locator system. The locator system also includes a rotation system that allows the work piece to be eccentrically rotated during the heat-treating process. In this manner, the lobe and heel portions of a cammed surface are substantially equidistant from the internal surfaces of an inductor so as to ensure substantially uniform heating of the external surfaces of the work piece.

Induction heating system having eccentric locator

A method and apparatus for shaping, in a planar direction, an elongatd generally flat surface formed in a steel workpiece and having a geometric continuous configuration, such as the outer facing surface of a cam on a camshaft for an internal combustion engine, which involve providing an inductor having a generally continuous heating surface matching the cam surface and generally parallel with the cam surface, forming at least one elongated uniformly cross-section groove in the inductor heating section and extending in a preselected linear location with respect to the heating surface and coterminous with the inductor heating surface, positioning the camshaft with the cam surface facing the parallel matching heating surface of the inductor with an air gap between the parallel matching surfaces so that the groove in the inductor surface faces a preselected band of the cam surface, such as the middle portion of the cam surface, energizing the inductor with a current having a frequency of less than about 25 KHz for a time less than about 3.0 seconds with a power density of about 20-70 KW/in.sup.2, at the cam surface, whereby the steel surface is heated to a temperature above the hardening temperature of the cam surface, with the higher power density at the outer edges of the cam surface, and immediately quench hardening the cam surface with a liquid quenching substance whereby the flatness of the cam surface is controlled by the position of the elongated groove. An equivalent result can be accomplished by other arrangements for changing the heating effect and particular band around the cam surface preparatory to immediate quench hardening.

Method and apparatus for shaping the surfaces of cams on a camshaft

An induction heating apparatus for inductively heating the valve seats of a family of engine component designs includes a plurality of rotatably mounted inductors which are selectively indexed and cycled in accordance with the component design presented at the heat treating station.

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Clawson, MI, United States of America

Michael R Hammond