A stepwise hot stamping forming method for ultra-high-strength steel plates

Abstract

The invention provides a stepwise hot stamping forming method of an ultra-high-strength steel plate. It includes the following steps: select the base material, determine the size of the ultra-high-strength steel plate for blanking; press and form the cold mold at room temperature; set the heating temperature and time to make the phase change of the high-strength steel plate in the furnace; place the preformed part After being taken out from the heating furnace, it is quickly transferred to the hot mold for positioning; the speed curve, quenching temperature and time are set, and the pre-formed parts are stamped and hardened; the formed parts are taken out from the hot mold for air cooling, shot blasting and spraying in sequence. Oil surface treatment. According to the stamping hardening stage, the present invention sets pressure, quenching temperature and time parameters according to the performance requirements of different components, so that the material can meet the performance requirements required by the components while reducing energy consumption in the quenching process. For adjacent parts that can be integrally formed, this process can be used to meet the strength requirements of each part and reduce welding and riveting and other connection processes.

Description

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

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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