High-strength steel thermoforming gradient heating device and heating method thereof

Abstract

The invention discloses a high-strength steel thermoforming gradient heating device. The device comprises an upper die base, a lower die base, a heating plate, a plurality of movable electrodes, a plurality of fixed electrodes, a heating device and a cooling water way, wherein the a base is arranged on the lower die base, a cooling block is arranged at the upper portion of the base, the movable electrodes are fixed to the lower portion of the upper die base through a pneumatic device, the fixed electrodes are fixed to the two sides of the cooling block, the heating device is arranged at the lower portion of the upper die base and arranged between the adjacent movable electrodes, and the cooling device is arranged inside the cooling block; different regions of the heating plate can be heated under different temperatures through heat transmitted after the movable electrodes and the fixed electrodes are powered on; the heating plate can be cooled by introducing cooling water into the cooling water way. The invention discloses a heating method of the high-strength steel thermoforming gradient heating device.

Description

technical field [0001] The invention relates to the field of high-strength steel heating, in particular to a high-strength steel thermoforming gradient heating device 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 important way to achieve the goal of ...

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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 part 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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