High surface hardening depths in large rolls and how specially adapted converter technology helps to achieve them – POSTER

Tränkner Christine - ITG Induktionsanlagen GmbH (Germany)

Surface hardening processes enable the production of workpieces with a hard and wear resistant surface and a tough core.
Induction hardening is a well-established method for this and used for a vast variety of metal parts from different industries.
Often, the treated parts are rather small with a specified surface hardening depth of a few millimetres. Special challenges arise
when dealing with exceptionally large pieces of several tons and an extended hardening depth of about an order of magnitude
higher.
Here, choosing the right frequency and – likewise – the proper converter technology is crucial.
The poster shows exemplary the inductive hardening of large rolls used in cold rolling mills. It explains how a large surface
hardening depth of several centimetres is reached, employing specially adapted converter technology.

Keywords: inductive hardening, roll hardening, large surface hardening depth, converter technology, IGBT converter