Ultrahigh-strength steel plate local quenching and hardening forming die

Abstract

The invention discloses an ultrahigh-strength steel plate local quenching and hardening forming die. The die comprises an upper die base, a female die fixed on the upper die base, a lower die base and a male die fixed on the lower die base, and the male die and the female die are of splicing type structures, composed of heating inserts and cooling inserts and used for heating and cooling different regions of the die. A plurality of electric heating tubes are embedded into the heating inserts, and cooling water holes are arranged inside the cooling inserts and connected with a cooling water circulating system. Portioned cooling and pressure maintaining quenching of paths after ultrahigh-strength steel plate hot forming can be achieved, and further parts with customized mechanical properties are obtained. The forming die is simple and reliable in structure, deformation of the parts is small as the whole process is completed with the die closed, and the parts are excellent in size precision.

Description

Technical field: [0001] The invention relates to a locally hardened forming die for processing ultra-high-strength steel plates with customized properties. technical background: [0002] With the increasing requirements for energy saving, emission reduction and collision safety of the automobile industry in today's society, the traditional body parts with high strength and low plasticity can no longer meet the development needs of the automobile industry, and a new generation of body parts with customized performance is developed. It is becoming an urgent problem for the automotive industry to solve. Compared with traditional high-strength and low-plastic parts, body parts with customized properties can achieve optimal distribution of microstructure and mechanical properties, thereby meeting comprehensive toughness requirements. For the processing of body parts with customized properties, the current sheet metal forming technology is far from meeting its requirements. For ...

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Problems solved by technology

For the processing of body parts with customized properties, the current sheet metal forming technology is far from meeting its requirements

For the conventional cold stamping technology, although the use of laser tailor welding technology can realize the poor strength, poor thickness and poor steel splicing of parts, it has not been effective for the high forming force and springback problems caused by forming high-strength steel plates. Solve, especially when the strength exceeds 1000MPa, the conventional cold stamping process is almost impossible to form

Although the overall quenching technology for hot forming of ultra-high-strength steel plates adopted in recent years has the advantages of high forming strength, good precision and small springback after forming, but because it is almost completely martensitic, the plasticity of the parts is greatly reduced. Generally, the elongation rate is lower than 10%, which cannot effectively absorb the collision energy, and the safety improvement of the body structure is limited, and the ultra-high-strength parts increase the difficulty of subsequent edge trimming and punching processing.

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