A kind of preparation method and device of coated steel plate, hot stamping method

Abstract

The invention discloses a preparation method and device of a coated steel plate, and a hot stamping method. The preparation method of the coated steel plate includes: blanking the bare steel plate to be processed according to requirements; and using high-temperature anti-oxidation materials to thermally spray both sides of the bare steel plate after the blanking is completed to form a coated steel plate. The hot stamping method includes: blanking the bare steel plate to be processed according to forming requirements; performing surface treatment on the bare steel plate after blanking to form a coated steel plate; heating the coated steel plate after the surface treatment is completed; The finished coated steel sheet is stamped. In the present invention, between the two steps of blanking and heating the bare steel plate, surface treatment steps such as double-sided thermal spraying of the bare steel plate with high-temperature anti-oxidation materials are added, so as to form a coated steel plate, which can avoid the need for a coated steel plate. Oxidation reaction occurs when heated, which has beneficial effects such as improving product quality and saving production resources.

Description

technical field [0001] The invention relates to the technical field of thermoforming, in particular to a preparation method and device of a coated steel plate, and a hot stamping method. Background technique [0002] At present, in the high-temperature hot forming process, it is necessary to heat the steel plate to a temperature above austenitization (usually around 900° C.) and then form it in a corresponding mold. However, the high-temperature forming process generally tends to produce oxides on the surface of the steel plate. These oxides affect the mechanical properties and surface treatment properties of the steel plate and need to be removed in subsequent processes. [0003] In order to solve the oxidation of the steel plate during the high-temperature forming process and improve the corrosion resistance of the steel plate, the coating process is more and more used in the steel plate for hot forming. At present, the steel plate with Al-Si coating on the surface produc...

AI Technical Summary

Problems solved by technology

Moreover, in the process of actually heating the traditional steel plate with Al-Si coating to 930 degrees, the Al in the Al-Si coating often melts and causes the furnace roll to stick. On the one hand, it causes nodules on the surface of the furnace roll, which is extremely Greatly reduces the service life of the furnace roll; on the other hand, the Al-Si coating and the furnace roll are stuck together, causing the blank to deviate during the movement, and then the positioning is wrong when it is sent into the mold. bad mold

[0005] Secondly, the existing steel plate with Al-Si coating sometimes needs laser tailor welding before thermoforming, in order to avoid the welding seam being located on the coating surface and affecting the strength of the weld seam, or the Al-Si coating being dissolved into the weld seam Affect the strength of the weld, thereby affecting the quality of thermoformed products. It is necessary to remove the Al-Si coating and then perform laser welding on the steel plate. This process will increase the production hours and costs.

[0006] Furthermore, the existing steel plate with Al-Si coating sometimes needs to go through a rolling process to form a variable-section steel plate before hot forming, that is, different regions on the steel plate have different thicknesses. When the steel plate is rolled, the reduction rate in different regions is different, so the deformation degree of the Al-Si coating is different, that is, after rolling, the Al-Si coating in different regions on the steel plate, especially the reduction rate increases, If the reduction rate is less than 30%, the transition layer in the Al-Si coating will be severely cracked, which will affect the corrosion resistance and oxidation resistance.

[0007] Thirdly, because the steel plate with Al-Si coating produced by the hot-dip plating process is generally a coil when it leaves the factory, it is necessary to punch and blank the sheet in actual thermoforming production, and the surface of the scrap after stamping and blanking also has Coating, generally coated waste is difficult to recycle