Gear Hardening Archives - Inductoheat Inc

November 30th, 2017

Induction Heating: Everything You Wanted to Know, But Were Afraid to Ask (December 2017)

Question of the Month: What is the difference between auto-tempering and self-tempering? Answer: Sometimes the terms auto-tempering and self-tempering are incorrectly used interchangeably. Here we will explore the differences […]

December 19th, 2011

Induction Contour Hardening of Bevel, Hypoid and Pinion Gears

Article discusses unique technology that allows the replacement of carburizing with induction contour hardening for a wide range of complex-shaped components, including parts previously thought to be impossible to induction […]

May 16th, 2011

Induction Hardening of Gears pt. 2 – 2

There are three ways to quench gears in spin hardening applications (Ref. 1):• Submerge the gear in a quench tank. This technique is particularly applicable for large gears.• Quench “in […]

November 22nd, 2010

Induction Hardening of Gears pt. 1

There are four popular heating concepts used for the induction spin hardening of gears that employ encircling-type coils: the conventional single-frequency (CSFC), pulsing single-frequency (PSFC), pulsing dual-frequency (PDFC) and simultaneous […]

October 7th, 2010

Single Coil Dual Frequency: Gear Hardening pt. 4

The gear is induction preheated to a temperature determined by the process features, typically being 350 to 100°C below the critical temperature Ac1. The pre- heat temperature depends on the type […]

July 12th, 2010

Coil Failures pt. 8: Gap by Gap Gear Hardening

Gears are induction hardened by either encircling the part with a coil (so-called spin hardening) or, for larger gears, hardening them “tooth-by-tooth” or “gap-by-gap.” Article concentrates on analyzing main coil […]

May 6th, 2010

Single Coil Dual Frequency: Gear Hardening pt. 3

As a rule, when it is necessary to harden only the tooth tips, a higher frequency and high power density should be applied; to harden the tooth roots, use a […]

April 23rd, 2010

Induction Hardening: Gears & Critical Components

Gear performance characteristics (including load condition and operating environment) dictate the required surface hardness, core hardness, hardness profile, residual stress distribution, grade of steel, and the prior microstructure of the […]

February 25th, 2010

Single Coil Dual Frequency: Gear Hardening pt. 2

True contour gear hardening pattern can be obtained utilizing this technology. Single-shot hardening of several powertrain components utilizing dual frequency systems dramatically minimizes distortion of induction hardened parts and provides […]

February 22nd, 2010

Single-Coil Dual-Frequency: Hardening of Gears pt. 1

Some induction practitioners have heard about simultaneous dual frequency gear hardening. Coil current waveform comprises two appreciably different frequencies making effect of two single frequency inverters working on the same […]