Electrotechnical Problems during Induction Hardening of Large Products

Abstract

Modern installations of induction heat treatment of large rolls of rolling mills are considered. The equipment and technology of induction heat treatment of mill rolls should be designed so as to guarantee heat-treatment quality. The main electrotechnical problems arising when designing induction heat treatment equipment for large rolls of rolling mills are formulated. The power supply circuits of the installation for hardening of the rolls were selected and justified, and the main problems arising when developing inductors are set out. The choice of operating current frequency is considered. A new structure of inductors for hardening of large rolls is proposed. Computer models for calculating the electromagnetic and temperature fields upon heat treatment of rolls are developed. A universal method of digital design of induction heat treatment installations is considered. The energy characteristics of inductors for hardening of the rolls of rolling mills are analyzed. The developed digital twin of inductors makes it possible to significantly shorten the experimental investigations of induction hardening of the rolls and the conditions of startup works and use digital control systems to achieve the highest quality of heat treatment of the rolls.