Induction Heat Treating William R. Stott, Managing Editor, Gear Technology
March /April 2011 www.geartechnology.com
This cutaway shot shows the heat treat and quenching pattern of a spur gear
induction hardened with the TSH technology (courtesy of ESR Engineering Corp.,
the North American distributor of TSH steels).
In recent years, there has been significant interest in expanding the use of induction hardening in gear manufacturing operations. One of the reasons is that induction hardening is easily incorporated into a manufacturing cell. Parts don’t have to be taken out of the production flow and sent to a separate heat treating department. Another reason is that induction hardening is often considered a “green” alternative. “Induction continues to have advantages that include precise heating of just the are requiring heat treat, thus minimizing the energy applied to the part,” says George Welch, manager of heat treat products for Ajax-Tocco Magnethermic. “In addition, induction does not consume energy when idle. Combine this with reduced energy for auxiliary equipment for quenching, etc., energy usage and costs are generally much less. Other advantages include fast processing time, fewer parts in process, cell manufacturing, less distortion and individual part traceability.”