Edge temperature control method and control device in steel plate induction heating process

Abstract

The invention discloses a method for controlling the edge temperature of a steel plate during induction heating. First, the steel plate (2) enters the induction heating furnace (3), the induction heating system starts to heat, and the infrared temperature measurement device installed on the upper sensor (8) The device (6) detects the temperature of the center and edge of the steel plate, and sends the measurement result to the intelligent processing unit; secondly, the intelligent processing unit calculates the temperature difference between the edge and the center of the steel plate in real time, and if the temperature difference exceeds the set value, calculates the edge compensation. The heating power or cooling intensity required for heat or cooling adjustment is sent to the PLC control system; third, the PLC control system issues instructions to the edge temperature adjustment system (5); fourth, the edge temperature adjustment system starts heating or cooling adjustment , until the temperature difference between the edge and the center of the steel plate is less than the set value, when the steel plate reaches the target temperature, the steel plate leaves the induction heating furnace. The invention detects and adjusts the edge temperature of the steel plate in real time to ensure that the edge temperature is basically consistent with the center temperature of the steel plate.

Description

technical field [0001] The invention relates to an on-line induction heating control technology for steel plates, in particular to a method and a control device for edge temperature control in the induction heating process of steel plates, which are suitable for the thermomechanical control technology of medium-thick steel plates. Background technique [0002] With the advancement of science and technology, the scope of material application continues to expand, and people's requirements for material performance are becoming more and more stringent. Thermomechanical control process (TMCP) has an important impact on the performance of materials, and can realize the production of steel plates with special properties, such as those with excellent welding performance. High-strength steel, steel for high-rise buildings, and steel for large ships can greatly improve the quality of thick plates, and have a particularly significant impact on the performance of thick plates. At presen...

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Problems solved by technology

[0003] In the online moving induction heating of the steel plate, due to the end effect of induction heating, there is often a certain temperature difference between the edge and the middle. If the temperature difference is too large, the structure of the steel plate will be uneven, and it will even cause deformation of the steel plate and deteriorate the mechanical properties of the steel plate, which is not conducive to Improvement of product quality

Through literature research and patent retrieval, Chinese patent CN201210044530.7 proposes a method for edge temperature control in the hot strip rolling process, which mainly adjusts the edge temperature of the strip by adjusting the heating power of the inductor. This method can only be used for heating, but There is no cooling function, and the temperature adjustment function cannot be realized when the edge temperature is too high; Chinese patent CN200510112077.9 proposes a method for controlling the temperature of the rough-rolled plate in the hot-rolling process. This method is used for temperature prediction and has no edge temperature adjustment function; Japanese patents JP2004074277A, JP2002226912A and JP2003082412A proposed that in the production of steel plate TMCP, the method of induction heating is used to heat the steel plate, but it lacks the control of the edge temperature method

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