Heating device capable of randomly adjusting heating area of high-strength steel and heating method of heating device

Abstract

The invention discloses a heating device capable of randomly adjusting a heating area of high-strength steel. The heating device comprises an upper die holder, a lower die holder, a heating plate, a plurality of movable electrodes, a plurality of upper fixed electrodes, a plurality of lower fixed electrodes, cooling water channels, and a heat conducting plate, wherein a sliding guide rail is arranged on the lower end face of the upper die holder; the upper end surface of the lower die holder is provided with a base, and cooling blocks are arranged on the base; the movable electrodes are movably mounted on the sliding guide rail through an air pressure device and can horizontally move on the sliding guide rail; the upper fixed electrodes are fixed on both sides of the guide rail; the lowerfixed electrodes are fixed on both sides of the base; the cooling water channels are arranged inside the cooling blocks; the heat conducting plate is arranged above the cooling blocks; different regions of the heating plate are heated at different temperatures by the energy transmitted after the movable electrodes and the upper fixed electrodes are electrified; the heating plate can be cooled by introducing cooling water into the cooling water channels. The invention further discloses a heating method of the heating device capable of randomly adjusting the heating area of the high-strength steel.

Description

technical field [0001] The invention relates to the field of high-strength steel heating, in particular to a heating device capable of arbitrarily adjusting the heating area of ​​high-strength steel and a heating method thereof. Background technique [0002] The automobile industry is the pillar of my country's national economy. Safety, low-carbon, and environmental protection are important topics for the development of the world's automobile industry today. Lightweight has been promoted to one of the goals of many automobile companies. How to achieve light weight while ensuring automobile Security is a major difficulty. Studies have shown that the strength of steel reaches 780MPa level, and it can have the same characteristics as aluminum-magnesium alloys with the same quality and high price. At this time, steel has obvious advantages in economy. Therefore, the development of high-strength steel plates with a level above 780MPa and excellent performance will become an impor...

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Problems solved by technology

[0003] In order to manufacture components with such properties, the traditional method is tailor-welded blank technology, which welds steel plates with different structural properties together, but the formability of this technology is limited by the weld seam, especially when welding steel plates of different thicknesses, it is difficult It greatly and greatly limits the complexity of the workpiece, and the coating on the steel surface needs to be removed for welding, so that the steel will be easily oxidized when heated; there is also a rolling plate technology, which is used in steel rolling In the process, the purpose of controlling the thickness of the plate is achieved by controlling the size of the roll, but the mold design is extremely difficult, and due to layout constraints, the utilization rate is low; the other is the post-treatment tempering process, that is, the martensitized Partial post-treatment and tempering of the parts, but this will undoubtedly increase the man-hours, and the corresponding increase in operation difficulty

The emerging method is the local cooling method, that is, cooling at different cooling rates during the austenitization of the workpiece to obtain parts with different phase compositions, such as figure 1 As shown, in the cooling process, it is necessary to accurately control the cooling rate required by different parts, and at the same time, the cooling rate is lower in the parts with higher plasticity requirements, which makes the production cycle too long, which is not in line with the high efficiency principle emphasized by modern industry

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