Method for machining high-strength steel hot stamping formed parts

Abstract

The invention discloses a method for machining high-strength steel hot stamping formed parts. The main principle of the machining method is that partial tempering or annealing processing is carried out on the hot stamping formed parts with the uniform performance, gradient changes of the tempering or annealing temperature are achieved through heat conduction of a board, gradient changes of the performance are achieved, and the partial trimming and hole punching performance and the impact performance of the parts are improved on the premise that the high strength is kept on other portions. The method includes the implementation steps of according to three-dimensional structures of a trimming and hole punching region and an impact energy absorption region, designing corresponding high-frequency induction heating coils, partially tempering or annealing the trimming and hole punching region and the impact energy absorption region to enable the trimming and hole punching region and the impact energy absorption region to be at certain temperature, achieving the gradient changes of the tempering or annealing temperature, carrying out air cooling on the partially-tempered or partially-annealed parts to enable the partially-tempered or partially-annealed parts to be at certain temperature, and finally and rapidly moving the air-cooled hot stamping formed parts to a trimming and hole punching mold to carry out mold trimming and hole punching.

Description

technical field [0001] The invention belongs to the field of processing high-strength steel hot stamping formed parts, and more specifically relates to a method for realizing the processing of the part trimming and punching and the collision energy-absorbing area. Background technique [0002] High-strength steel hot-formed parts can reach a high strength of 1500-1700MPa, but its ductility will decrease with the increase of strength, and some parts of the passenger car body need to have a certain strength and plasticity to absorb energy to improve Crashworthiness. For example, the B-pillar of the car body needs sufficient strength for the upper part and the middle part so that the car can ensure the integrity of the car body when it is under impact, and prevent collisions and intrusions from causing occupant damage. In addition to the need for a certain strength, the lower part needs better strength Ductility to absorb impact energy. [0003] In the existing high-strength ...

AI Technical Summary

Problems solved by technology

Due to the high strength (1500-1700MPa) of hot stamping parts of high-strength steel plates, conventional punching and trimming technology is difficult to achieve, and only laser cutting technology can be used

Although the processing cost has decreased with the maturity of laser cutting equipment and technology, it is still difficult to achieve beat synchronization with the existing thermoforming process, so multiple sets of 3D laser cutting equipment are needed to achieve synchronization with the thermoforming production line

The low production efficiency and high investment cost of hot forming parts such as trimming and punching are urgent problems to be solved

On the whole, the existing high-strength steel processing methods mainly have the following technical problems: 1) Due to the high strength of hot-formed parts (1500-1700MPa), the trimming and punching needs to use three-dimensional laser cutting technology, and the production efficiency is low ;2) Using different mold temperatures to control the cooling of the sheet metal to obtain performance gradients, the process control is difficult, and the performance of the transition zone is unstable

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