Hot metal gas forming and quenching system and process

Abstract

The invention relates to a hot metal gas forming and quenching system. The system involves a hydraulic machine, a die assembly, a rapid heating module and a rapid cooling module, wherein the die assembly comprises a progressive die, and hot gas forming and rapid cooling of a workpiece can be achieved. The invention further provides a hot metal gas forming and quenching process. The hot metal gas forming and quenching system has the following advantages that 1, a pipe is manufactured by adopting an uncoated plate, so that the cost is lower, and the structure defects and the process risk are less than those of a pipe made of a coated and plated metal plate; 2, the progressive die is adopted, a resistance heating procedure and a hot gas forming and quenching procedure are achieved at the sametime in parallel, and progressive feeding is adopted, so that the takt is fast, and the efficiency is greatly improved; 3, the heating state of a part is protected in the whole process, oxidation isprevented, a coating is not needed, and the workpiece can be directly welded to a vehicle body without shot blasting after being formed, so that the cost is greatly saved; and 4, safety protection measures with directional damage are adopted, so that the safety is improved.

Description

technical field [0001] The invention belongs to the technical field of metal plastic processing, and in particular relates to a system and process for hot gas bulging and rapid cooling strengthening of metal pipes. Background technique [0002] The current tide in car manufacturing is undoubtedly shifting towards greater weight reduction targets, ultimately leading to more significant energy savings and emissions reductions. Lightweight is one of the important ways to realize the energy saving and emission reduction of traditional vehicles and to solve the problem of insufficient mileage of new energy vehicles. [0003] Materials such as ultra-high-strength steel, high-strength aluminum alloy, and high-strength magnesium alloy are key materials for lightweight automobile bodies. These materials have problems such as low plasticity, large rebound, and easy cracking during the forming process. Quality precision forming matters. Metal pipe hot gas bulging and quick cooling st...

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Problems solved by technology

[0004] Existing research results have shown that the HMGF&Q forming process can increase the strength of high-strength steel pipes from 800MPa to about 1500MPa. The process route is feasible and the application prospect is good. However, most of the existing technologies do not have anti-oxidation gas protection devices. The following process problems need to be further solved: ①The heating cost of the continuous furnace is high, and steel pipes with protective coatings such as aluminum-silicon coatings need to be used to make tubes. The high cost and welding inclusions affect the quality of formed products

The high energy consumption of the pipe heating and heat preservation system in the gas protection atmosphere of the continuous furnace also increases the energy consumption of the system, and the difficulty in making pipes with anti-corrosion coating boards also increases the cost; After the robot is transferred to the mold after heating, there are disadvantages of air oxidation during the transfer process and a slow production cycle; ③The safety issues of ultra-high pressure air pressure and high temperature heating equipment have not been reliably resolved; ④The hot air expansion + quenching forming station is first The method of resistance heating and then inflating forming and quenching has problems such as series connection of processes, long processing time, product surface oxidation, etc.

These problems lead to dangerous equipment systems, high energy consumption, and high costs, but also make the working environment of the workshop hotter and louder, and ultimately the technology is difficult to popularize

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