Induction heating method and device suitable for steel plates with arbitrary warpage

Abstract

The invention discloses an induction heating method suitable for steel plates with any warping degree. Firstly, a steel plate (2) is moved to an inlet of inductors (8) of an induction heating furnace through a roller bed system (1), displacement sensors (5) located on the upper portion of the front end of each upper inductor (3) are used for detecting the distance between the surface of the steel plate and the sensors and sending a measurement result to an intelligent processing unit; secondly, the intelligent processing unit works out the warping degree of the steel plate and an upper inductor position adjusting mode and sends the warping degree of the steel plate and the upper inductor position adjusting mode to a PLC control system; thirdly, the PLC control system sends adjustment commands to an upper inductor position adjusting system (4), so that the distance between the steel plate and the upper inductors is kept relatively constant; and fourthly, when the steel plate enters the inductors, infrared temperature measuring units (6) mounted at the inlet ends of the upper inductors are used for detecting the temperature of the steel plate, power needed for heating the steel plate to a target temperature is worked out, and an inductor heating system is started to heat the steel plate, so that when the steel plate leaves the induction heating furnace, the temperature of the steel plate reaches the target temperature.

Description

technical field [0001] The invention relates to an online induction heating control technology for steel plates, in particular to an induction heating method and device with the function of self-adaptive adjustment of spacing, which is suitable for the thermomechanical control process 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 present, the...

AI Technical Summary

Problems solved by technology

In China, thick plates are mainly produced using the traditional TMCP technology. The steel plate is heated by a medium furnace or a resistance furnace, and then tempered. The heating rate is slow and the heating efficiency is not high. It is difficult to fully meet the current performance requirements for materials.

First of all, for online induction heating of thick plates, it is required to heat the steel plate to the target temperature in a very short time, and then carry out air cooling. When the moving speed of the steel plate is fast, the power required is relatively large; Irregular deformation, warping, etc. occur. When the deformation and warping are too large, collisions will occur when entering the furnace. When the steel plate and the induction furnace are moving in the furnace, the steel plate will be stuck, which will not only damage the induction furnace, but also cause equipment performance damage. Unstable, and steel plate jamming will affect the rhythm of the entire production line, which is not conducive to the scheduling of production organization, and is also not conducive to online fault handling. This puts forward higher requirements for the structural design of the induction furnace; The temperature uniformity of the cross-section has high requirements, and the temperature control is difficult. However, there are not yet mature technologies and equipment in China that can be used and used for reference.

[0004] Through literature and patent retrieval, only Japanese JFE has this technology. 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. However, the induction heating equipment is a spiral coil. When the steel plate warps When the curvature is large, the induction heating equipment cannot handle it, and it cannot pass through the production line. It needs to pass through other equipment and transfer the steel plate, which is not conducive to the matching of the rhythm of the production line and seriously affects the production efficiency.

In the Chinese patent CN200810196998, the method of induction heating is used to supplement the heat of the steel plate, and its coil structure is also a spiral coil, which cannot quickly process abnormally warped steel plates

[0005] In addition, for relatively thin steel plates (thickness not exceeding 20mm), online heating cannot be realized if the warpage or deformation is too large, and the steel plate needs to be processed off-line quickly, and the subsequent management and processing costs of the steel plate need to be increased. It will cause the reduction of production efficiency and the increase of product cost, which is not conducive to the continuous production of the production line.

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