Induction Edge Hardening

Induction Hardening - Overview

Induction edge 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.

The controllability and precision of induction heating process make it an extremely effective processing method for hardening the edge of many. 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:

There are two principle approaches employed in edge hardening systems:

All edge hardening systems feature the same principle elements as follows:

Induction Edge Hardening - Case Study Traverse System

Application - Lawn Mower Bottom Blade.
Component Details - 3mm thick 300mm to 450mm in length.
Process Requirement - Harden one edge to a depth of 10mm in 30 seconds.
Induction Equipment - UT 111 200 12 Kw 200KHz Ultra-Tec power unit.
Feed System - IHG 11 HLMBH 22 Horizontal traversing conveyor complete with 30 minute capacity auto load magazine.

The system features a specially designed and tooled conveyor with a variable speed drive. Built into and forming the base is the quench collection system and al necessary pumps and filters.

Input to the system was via a stripper 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 12 /12 split air-blast cooler.

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