Caterpillar Inc.

Fredric A Woldow

Peter William Anderton

Gary D Keil

Dennis C Pond

Timothy G Van Den Avond

A method of hardening a work piece having (i) an outer surface, (ii) an inner surface which defines a passageway extending through the work piece, and (iii) an end. The method includes the steps of (A) advancing the work piece through a first induction coil such that a first hardened area is formed on the work piece, (B) advancing a second induction coil into the passageway of the work piece such that a second hardened area is formed on the work piece, and (C) positioning a third induction coil adjacent to the end of the work piece such that a third hardened area is formed on the work piece. The positioning the third induction coil step is performed after (i) the advancing the work piece through the first induction coil step and (ii) the advancing a second induction coil into the passageway step.

Method of hardening a bushing of a track chain

The present automated system for carburizing a component decreases the energy used to manufacture the component. The operations of heating the component in a first heating apparatus, forging the component in a forge and transferring the hot forged component directly to a second heating apparatus having a controlled atmosphere, increasing the temperature of the component, absorbing carbon within the component to a predetermined surface carbon content and depth and directly transferring the component to a quenching chamber and quenching the component defining a heat treated component.

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Morton, IL, United States of America

Fredric A Woldow