Thermal punch forming technique and forming mold for super-strength steel

Abstract

The invention provides an ultra-high strength steel thermal punching molding process and a molding die thereof. Before the thermal punching molding of ultra-high strength steel sheet, the thermal punching molding process is used for heating parts which are in contact with the ultra-high strength steel sheet in a die and need to be punched, so as to lead the surface temperature of the parts to reach or exceed martensite temperature of the ultra-high strength steel. Then, the ultra-high strength steel sheet which is heated to be totally austenitized is put in the die to be punched and molded. When closed, the thermal punching die is cooled. The die parts which are in contact with the molded parts are utilized for quenching the molded parts. The thermal punching molding die comprises a convex die, a concave die and a control unit. An electrothermal element and a cooling water channel are arranged in the convex die and the concave die. A temperature sensor is arranged in the convex die and the concave die. A reset switch and a pressure plate are respectively arranged on lateral sides of the concave die and the convex die. The ultra-high strength steel thermal punching molding process and the molding die thereof avoid cracks on surfaces and at the inner parts of the molded parts, eliminate the part molding resilience and ensure the precision and the quality of products.

Description

technical field [0001] The invention relates to an ultra-high-strength steel hot stamping forming process and a mold, and belongs to the technical field of ultra-high-strength steel stamping forming technology. Background technique [0002] Lightweight vehicles can reduce fuel consumption and reduce engine exhaust emissions. In order to make the car still meet the crash safety performance after being lightweight, major car companies have shifted their focus to the application of new materials and new processes while optimizing the car frame and structure. Especially in terms of body structure, through the research and use of advanced high-strength steel and ultra-high-strength steel, the crash performance of the car has been improved, and the requirement of lightweight has also been realized. However, with the improvement of steel strength, the elongation and formability of the material are also greatly reduced. During the forming process, problems such as cracking, wrinkli...

AI Technical Summary

Problems solved by technology

This will cause the contact part between the sheet and the mold to drop below the Martensite point temperature (Ms point) before the hot stamping, and produce a martensitic structure, which affects the formability of the sheet, resulting in hot stamping parts Large amount of rebound after forming, even lead to cracks on the surface and inside of the formed part, affecting the forming accuracy and forming quality of hot stamping parts

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