Sensing and heating method of high-magnetic induction oriented silicon steel

Abstract

The invention discloses a sensing and heating method of high-magnetic induction oriented silicon steel, which belongs to the technical field of the heating of roll steel. The sensing and heating method comprises following steps that a high-magnetic induction oriented silicon steel plate blank is placed into a sensing and heating furnace to be controlled and heated in stages, basic voltage is set by an inverter on a starting heating stage, constant-voltage rapid heating is conducted, then a variation relation between the temperature of the plate blank and the voltage of the inverter is established, a temperature increase curve of the plate blank is set, closed-loop temperature increase is conducted by a temperature closed-loop controller according to the temperature increase curve, finally the closed-loop soaking control is conducted by adopting a variable-voltage temperature closed-loop controller, and the maximal soaking time is not greater than 30min. The stable and precise control of the temperature is fed back by a radiation high-temperature gauge through a temperature filter control technology in the heating process of the plate blank. Due to the adoption of the sensing and heating method, the problem that the control precision is not high under the temperature open-loop control mode and the control disturbance problem caused by the abnormal fluctuation of the temperature of the high temperature gauge occurred in the heating process can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of rolling steel heating, and relates to an induction heating method for high magnetic induction oriented silicon steel. Background technique [0002] In order to improve the production efficiency of high magnetic induction grain-oriented silicon steel and maintain the stability of mass production, many steel mills have been devoting themselves to the development and research of low temperature heating-high temperature rolling rolling route in the hot rolling process. Among them, the induction heating technology of the electromagnetic induction furnace is the most superior. The electromagnetic induction heating furnace is based on the principle of electromagnetic induction. The intermediate slab with a temperature above 1000°C placed horizontally on the roller table is turned over and moved horizontally on the roller table through the slab turning and conveying device, and then vertically loaded into the indu...

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Problems solved by technology

[0003] At present, most of the electromagnetic induction heating furnace equipment used in industrial production in the world is provided by Japanese complete sets. The control technology of the slab in the induction heating process mostly adopts the constant voltage temperature open-loop control method, and the temperature rise curve control is single, which cannot be carried out. Flexible adjustment; during the heating process, the working state of the pyrometer feedback value used for temperature detection is unstable, and there are abnormal disturbances; the accuracy of the slab temperature control is not high, and there is a trend of temperature oscillation in the soaking section, and the deviation from the target temperature is within 5°C-10 Between ℃

The above control defects are not conducive to the adjustment and optimization of grain-oriented silicon steel process parameters. After the slab is heated, the performance stability of the finished product is not high, the temperature technical requirements after rough rolling cannot be guaranteed, and the material preparation requirements of the downstream cold rolling process cannot be met in batches.

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