A quenching method for aerodynamic thermoforming of complex components of ultra-high-strength steel

Abstract

The invention discloses a pneumatic hot forming-atomization quenching method and device for an ultrahigh-strength steel complex component, and belongs to the technical fields of advanced metal manufacturing and plastic forming. The method comprises the steps that firstly, a punched plate is heated until austenization is complete; secondly, the punched plate is placed in a pneumatic forming device,a mold is closed, the plate and a female mold body are completely attached by gradually increasing the air pressure, and pressure maintaining is conducted for a period of time; thirdly, high-pressureatomized gas flowing at a high speed is formed in stamping equipment by atomizing supercooled liquid drops with circulating protection gas in a matched mode through a gas circulating control system,quick and uniform quenching is conducted on the ultrahigh-strength steel plate, and the complete Martensite structure is obtained; and lastly, cutting operation, punching operation and the like are conducted. According to the method, the non-uniform quenching phenomenon generated in the ultrahigh-strength steel cooling process can be effectively solved, the service life of the mold can be prolonged, the processes can be reduced, and the product surface quality can be improved; the forming efficiency of ultrahigh-strength steel can be improved, the cost can be reduced, and the high engineeringapplication value is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a rapid mixing atomization gas quenching forming method for ultra-high-strength steel plates. Background technique [0002] Technological innovation in the automobile manufacturing industry is of great significance to promote my country's economic development and industrial modernization. Among them, strengthening the passive safety of automobiles through the improvement of the structural strength of key safety components is the core element of the development of the automobile manufacturing industry. At the same time, the development of automobile lightweight technology is an important theme in the current automobile manufacturing industry and an important way to solve the global energy crisis and environmental problems. "National Medium and Long-Term Science and Technology Development Plan (2006-2020)" and "Made in China 2025" clearly set the research...

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Problems solved by technology

[0005] However, the traditional hot stamping technology has the following defects: (1) Including the patent mentioned above, the stamping process is carried out through the direct contact of the concave-convex die combination die with the plate, the thermal shock damage to the die is large, the die life is short, and the cost is high ; (2) A hot forming method for components with complex shapes of martensitic steel plates (CN201611217511.4) can realize the forming of stamped negative angle components, but the cooling pipeline design cost is high by using the traditional in-mold cooling method, and the high pressure cavity The low thermal conductivity of the gas in the quenching process will easily cause uneven heating of the surface to cause cracking; (3) the traditional rigid contact stamping dies involved in the current patent (CN201610778308.8, CN200810249740.3, CN201110109510.9, CN201410529046. 2, etc.), the thickness direction is uneven, the cooling system needs to be set according to different mold shapes, and the design cost of the cooling system is high and the technology is difficult

Not only that, the surface quality of hot stamping products is poor after quenching, and there is also surface oxidation, which requires subsequent shot peening operations to remove the surface oxide layer and surface relief, resulting in redundant operations

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