Hot stamping method of galvanized steel sheet

Abstract

The invention provides a hot stamping forming method and device for a galvanized steel sheet. The galvanized steel sheet comprises a steel sheet body and a galvanized layer. Before galvanized steel sheet hot stamping forming, a heat absorption layer is sprayed on the surface of the galvanized steel sheet, and the galvanized layer is evenly coated with the heat absorption layer. The method comprises the following main steps of (1) steel coil uncoiling, (2) sheet blank blanking, (3) heat absorption layer coating, (4) heating stamping and (5) pressure maintaining quenching. The invention further provides the hot stamping forming device for the galvanized steel sheet. The device of the hot stamping forming method for the galvanized steel sheet comprises an uncoiling device body, a stamping device body, a coating device body and a hot stamping forming device body. The technical problem that in original galvanized steel sheet hot stamping forming, liquid metal brittle fracture is caused due to the fact that melted Zn contained in a plating layer intrudes into a bottom layer steel sheet body during heating treatment of the steel plate before hot pressing is solved, so that the steel plate is completely quenched and hardened, the mechanical strength of a product is optimum, and collecting and cooling recovery are conducted through pumping component heat adsorption materials.

Description

technical field [0001] The invention relates to the technical field of hot stamping, in particular to a hot stamping method for galvanized steel sheets. Background technique [0002] The hot stamping process (hot stamping) was first developed by a Swedish company and applied for a patent (GB1490535, 19771102), which is used to manufacture saw blades and lawn mower blades. However, in view of the light weight, safety and impact resistance of automobiles, the demand for high-strength automobile structural steel plates has become increasingly apparent. In 1984, SAAB Automobile Company introduced hardened boron steel parts into automobile manufacturing for the first time (Saab9000), becoming the first The company introduced the hot stamping technology into the automotive field, which has sparked another research upsurge in hot stamping technology. [0003] The hot stamping forming process refers to: first heating the material (ultra-high strength / high strength steel) to a speci...

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Problems solved by technology

[0010] The invention provides a hot stamping forming method of galvanized steel sheet, which effectively solves the liquid metal brittleness caused by molten Zn contained in the coating intruding into the underlying steel sheet during the heat treatment of the steel sheet before hot pressing in the existing hot stamping of galvanized steel sheet The technical problem of fracture, and make the steel plate completely quench hardened, so that the mechanical strength of the product can be optimized

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