Machining method for hot stamping part based on self-resistance heating performance gradient

Abstract

The invention discloses a machining method for a hot stamping part based on the self-resistance heating performance gradient. The machining method comprises the steps that the hot stamping part is divided into a collision energy absorption area and a high-intensity area; a plate blank is cut into the corresponding shape, placed between electrodes on the two sides of a large-power power source and fastened through ejection air cylinders; the plate blank in the collision energy absorption area is subjected to short circuit operation through short circuit blocks, a low-temperature area is formed, and the corresponding high-intensity area is a high-temperature area; the high-temperature area is fully austenitized through the large-power power source, the temperature of the low-temperature area is maintained stable under the action of the short circuit blocks, and a plate blank with the temperature gradient is formed; and the ejection air cylinders release pressure finally, so that the hot stamping part with the gradient performance is obtained after stamping and quenching in a die are conducted. The machining method for the hot stamping part based on the self-resistance heating performance gradient has the advantages of being high in heating efficiency, low in energy consumption, capable of reducing blank oxidation and the like; the die design difficulty is lowered, and industrialization is easy; and the comprehensive collision performance of the hot forming part is improved on the premise that the intensity is ensured.

Description

technical field [0001] The invention relates to a processing method of a hot stamping part, in particular to a processing method of a hot stamping part based on self-resistance heating performance gradient. Background technique [0002] Due to the continuous improvement of automobile lightweight and safety performance requirements, stamping parts must not only have high strength, but also need to have high plastic deformation capacity. Therefore, the hot stamping forming technology of high-strength boron steel plate is used to obtain a strength exceeding 1500MPa High-quality stamping parts have broad application prospects in automobile parts such as the middle channel, B-pillar, and anti-collision plate. At present, in order to achieve the comprehensive performance of stamping parts, the commonly used method is to weld the stamped and formed parts of different materials, or to stamp and form auto parts with laser tailor welded blanks. [0003] For example, the method of coo...

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Problems solved by technology

[0003] For example, the method of cooling the mold in different regions is used to obtain gradient performance by controlling the cooling speed at different positions during the hot stamping and quenching process of the formed part. The structure of the mold device in this method is relatively complicated, and processes such as local heating of the mold bring a lot of energy loss

Or, put the high-strength steel slab to be formed into the heater, and heat the high-strength steel slab along the length direction. In addition to the need for a special heating device, the heat transfer between different regions of the slab is inevitable due to the long heating time. , it is difficult to achieve a large temperature gradient, which will also adversely affect the gradient performance

For another example, according to the structure of the trimming punching area and the collision energy absorption area, design the corresponding high-frequency induction heating coil, and perform local tempering on the trimming, punching area, and collision energy absorption area to achieve the effect of tempering or annealing. The temperature gradient changes. The induction heating method used in this process needs to design different heating coils according to the specific shape of the parts. The shape of the induction heating coil, the distance between the coil and the sheet, the current and the frequency are not universal, and the heating process Will lead to warping deformation of formed parts and large internal residual stress

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