Whole induction heating temperature control method for support rollers

Abstract

The invention relates to a whole induction heating temperature control method for support rollers. According to the method, an induction coil is divided into five sections, wherein the current strengths of the induction coil upper section, the induction coil sub-upper section, the induction coil sub-lower section and the induction coil lower section are 80-120% of the current strength of the induction coil middle section; and then the support roller is heated, wherein the support roller rotates through a support member along the axis line during the heating process and performs reciprocating movement through the support member along the axis line during the heating process, the whole heating process is divided into the stage using high-power heating to achieve the roller surface target temperature and the stage using heating with a plurality of small powers to carry out thermal insulation, the total heating time is controlled at 90-240 min, and the support roller surface axial temperature difference is controlled within + / =10 DEG C. With the method of the present invention, the temperature distribution of the work-piece can completely meet the process requirements, the ideal work-piece surface hardness layer can be obtained, and the method has characteristics of production cost reducing, significant energy saving effect, cleaning property, and environmental protection.

Description

technical field [0001] The invention relates to a temperature control method in the field of metal processing, in particular to a method for controlling the overall induction heating temperature of backup rolls on a rolling line in the field of steel processing. Background technique [0002] At present, in the rolling process of the rolling line in the field of iron and steel production, one of its key components - the back-up roll plays a role in supporting the work roll. The back-up roll must have good rigidity, and due to the long service life of the back-up roll , long-term rolling contact with the work roll or intermediate roll, the roll surface is prone to wear and work hardening, so the roll surface material of the back-up roll must have high hardness, wear resistance and crack growth resistance, especially for large steel production lines The large-diameter back-up rolls used above require good working performance, and in order to improve one of the key indicators - ...

AI Technical Summary

Problems solved by technology

[0009] 1) In the radial direction, it is difficult to control the temperature gradient distribution that meets the process requirements;

[0010] 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;

[0011] 3) Due to the large volume of large and large-diameter support rollers, the power and heating time required to reach the target temperature are much higher than conventional induction heating, which brings certain risks to stable and reasonable industrial production

[0012] Therefore, the overall induction hardening technology under the existing technology still has a lot of defects for processing large-scale large-diameter backup rolls.

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