Large-diameter support roller integral induction heating system and control method thereof

Abstract

The invention discloses a large-diameter support roller integral induction heating control method. Temperature measurement probes are arranged on a coil to detect the temperatures of the central portion, the upper end portion and the lower end portion of a workpiece respectively, a closed loop control unit controls a compensation unit in parallel with the end portions of the coil when the detected end portion temperatures are non-linear in order to change the current intensity of a corresponding position coil, so the heating temperature uniformity of the surface of the workpiece by the coil is guaranteed, thereby the temperature distribution of the surface of the workpiece completely satisfies technological requirements. The invention also discloses a large-diameter support roller integral induction heating system.

Description

technical field [0001] The invention relates to induction heating and quenching technology, more specifically, to an overall induction heating system for large-diameter support rollers and a control method thereof. Background technique [0002] During the rolling process, the back-up roll supports the work roll and must have good rigidity; the back-up roll has a long service life and is in rolling contact with the work roll or intermediate roll for a long time, and the roll surface is prone to wear and work hardening. The material must have high hardness, wear resistance and resistance to crack growth. In order to improve the hardness of the roller surface, it needs to be heat treated. [0003] In the final heat treatment process of large-diameter backup rolls, differential temperature quenching and induction quenching are generally used to keep the austenitized core at a certain depth on the surface of the roll body below the temperature of the transformation point, so tha...

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Problems solved by technology

[0004] Although induction heating technology has become a conventional technology for surface heat treatment of metal materials, it still has great technical difficulties in the overall induction heating of large workpieces, which are mainly reflected in: 1) radial direction, the temperature gradient that meets the process requirements It is difficult to control the distribution; 2) In the axial direction, it is difficult to control the uniformity of the temperature distribution, that is, due to the existence of the end effect, the temperature distribution at the end is nonlinear, and this nonlinear temperature distribution will lead to the final surface The hardness distribution is uneven, which affects the use effect and life of the roll; 3) Due to the large volume of the workpiece, the power and heating time required to reach the target temperature are much higher than conventional induction heating, which is very important for stable and reasonable industrial production. come at a certain risk

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