Cascade hot stamping forming method for ultrahigh-strength steel plate

Abstract

The invention provides a cascade hot stamping forming method for an ultrahigh-strength steel plate. The cascade hot stamping forming method comprises the following steps that a base material is selected, and the size of the ultrahigh-strength steel plate is determined for blanking; stamping forming is conducted through a cold die in a normal-temperature state; the heating temperature and time areset, so that the high-strength steel plate in a furnace generates phase change; after a preformed part is taken out of the heating furnace, the preformed part is quickly transferred to a hot die and positioned; a speed curve, the quenching temperature and time are set, and stamping hardening is conducted on the preformed part; and a formed part is taken out of the hot die and sequentially subjected to air cooling, shot blasting and oil spraying surface treatment. According to the cascade hot stamping forming method, for the stamping hardening stage, pressure, quenching temperature and time parameters are set according to the performance requirements of different parts of the part, so that energy consumption in the quenching process is reduced while the material meets the performance requirements required by the part; and for the adjacent part capable of being integrally formed, the strength requirements of all the parts can be met by means of the process, and the connecting proceduressuch as welding and riveting are reduced.

Description

technical field [0001] The invention relates to the technical field of hot stamping technology, in particular to a step hot stamping forming method for ultra-high-strength steel plates. Background technique [0002] Due to its light weight and high strength, ultra-high-strength panels have become one of the important ways to reduce vehicle weight, reduce consumption and improve safety, and have been more and more widely used in automotive body structures. In practical applications, there are two types of problems. One type of problem is that the performance requirements of each part of the same part of the car are different, and the strength requirements of different parts are also inconsistent. Another type of problem is that due to inconsistent performance requirements, complex parts are split into multiple parts, which are connected and assembled through welding and riveting processes, making the parts processing process more complicated. At present, the stamping process...

AI Technical Summary

Problems solved by technology

For ultra-high-strength steel sheets (tensile strength > 1100MPa), the cold stamping process only changes the physical properties of the ultra-high-strength sheet material, but does not change its crystal phase structure, so the ultra-high-strength steel sheet cannot be accurately controlled during the cold stamping process rebound amount

The hot stamping process has the disadvantages of high energy consumption, large equipment investment and low production efficiency, but it can be adapted to produce ultra-high-strength steel plates and parts with relatively complex forming structures

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