Induction Shaft Hardening

Induction Shaft Hardening - Overview

Progressive Induction Shaft Hardening or traverse hardening is a heat treatment method which utilises the principle of induction heating to alter the surface metallurgy of a metal to provide hardened outer skin or edge. By moving the component through the induction coil progressively with a following quench ring it is possible to heat treat shafts of any length.

The controllability and precision of induction heating process make it an extremely effective processing method for hardening the outer skin of round shafts and splined components. As the heat is generated very quickly within the component itself very precise control is possible over the heated area thereby reducing distortion and allowing extremely quick efficient processing.

Induction Hardening Vertical Traverse

The principle advantages of induction edge hardening over traditional methods such as flame hardening are as follows:

All progressive shaft hardening systems feature the same principle elements as follows:

There are two principle approaches employed in shaft hardening systems:

Induction Shaft Hardening - Case Study Horizontal Traverse system

Application - Power Tool Drive Shafts.
Component Details - Various diameter and length splined shafts. 10mm to 12 mm diameter 150mm to 250mm long.
Process Requirement - Harden 1 splined area to a depth of 1mm below root.
Induction Equipment - UT 111 200 30 kW 200kHz Ultra-Tec power unit.
Feed System - IHG11/2 Twin track horizontal pin feeder with low level hopper load.


The system features a specially designed twin track roller system to provide component rotation. Positional control of the pusher mechanism is via an encoder based system with operator interface via a HMI panel.

The control system utilises a menu based system to allow variable parameters including heat on, heat off, power and traverse speed to be set and stored under part number for rapid retrieval. Built into and forming the base is the quench collection system and al necessary pumps and filters.

Input to the system was via a hopper type magazine with 30 minute capacity. The system featured PLC control with a recipe based setting system utilising a Mitsubishi HMI with error trapping on all critical parameters. Work coils and quench gallery. IWC 30 /30 split air-blast cooler.

Please browse our website for more information about Induction Hardening then contact us on 0114 272 3369 to speak to a member of our team or e-mail us on info@inductelec.co.uk.