Hot bath forming process of high-corrosion-resistance and easy-to-weld hot-pressing part

Abstract

The invention provides a hot bath forming process of a high-corrosion-resistance and easy-to-weld hot-pressing part, and relates to the field of thin plate hot stamping and sheet metal part manufacturing. The process comprises the following steps of S1, heating a plated hot-formed steel plate in a heating furnace until the plated hot-formed steel plate is in a complete austenitizing state; S2, transferring the heated plated hot-formed steel plate into a boiling water tank, immersing the plated hot-formed steel plate in boiling water, and cleaning an oxide layer; S3, forming the coating hot forming steel plate under the combined action of boiling water, an upper mold and a lower mold, carrying out pressure maintaining and quenching, obtaining a part; and S4, taking out the part to perform air blowing or drying treatment in a drying furnace, and moisture in a plating layer of the part is removed. According to the process, the plate is immersed in the boiling water, a surface oxide layer is uniformly and controllably removed by virtue of bubbles generated between the boiling water and a hot plate, the forming temperature of the plate is uniformly and accurately controlled, and meanwhile, forming and quenching are performed in the boiling water, so that the production quality of parts can be improved, the service life of a mold is prolonged, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of hot stamping of thin plates and the manufacture of sheet metal parts, in particular to a hot-bath forming process for high-corrosion-resistant and easy-to-weld hot-pressed parts. Background technique [0002] The main process in the hot stamping forming process is: blank heating - stamping forming and quenching - laser trimming, shot blasting. Hot stamping technology has been widely used due to the advantages of small forming force, small part springback and high strength after forming. Edges will corrode ahead of time, especially lower body parts such as sill beams. [0003] Due to the low melting point of the galvanized layer (the melting point of pure Zn is only about 400°C), the austenitization temperature of the base material is high (850-900°C); and in the direct thermoforming process, the lower the coating temperature, the better (650°C below), and the higher the substrate temperature, the better (above 75...

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the deficiencies in the prior art, especially the extremely thin surface oxide layer is difficult to uniform and controllable cleaning, the pre-cooling temperature is difficult to control, etc., so as to provide a hot bath forming of high corrosion resistance and easy welding hot-pressed parts Process, balance the forming temperature of the coating and the forming temperature of the substrate, immerse the sheet in boiling water, use the bubbles generated between the boiling water and the hot sheet to remove the oxide layer on the surface of the steel plate evenly and controllably, and uniformly and accurately control the forming temperature of the sheet

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