Heating medium immersion heating hydraulic forming method and device for magnesium alloy sheet

Abstract

The invention belongs to the technical field of magnesium alloy sheet forming, and particularly relates to a heating medium immersion heating hydraulic forming method and device for a magnesium alloysheet. The device mainly comprises an edge pressing ring, a female die body, a high-temperature hydraulic pump, a heat preservation box and a pressure relief valve, the edge pressing ring and the female die body are fixed together through a hydraulic device body to form a die, edge pressing force is applied to a blank in the die through the die, the magnesium alloy sheet blank and the die are bothimmersed in hot oil, a loading cavity is formed between the blank and the edge pressing ring after the blank is combined with the die and the edge pressing ring, a back pressure cavity is formed between the blank and the female die body, the loading cavity is a closed cavity and is filled with the high-pressure hot oil, and the high-pressure hot oil acts on the blank, so that the blank is plastically deformed and makes contact with the female die body so as to form a part with the same shape as the female die body. According to the method, the hot oil is adopted as a force transferring mediumto replace a rigid male die body to transfer the load, and therefore the cost of the die can be lowered, the production preparation period can be shortened, the quality of the formed part can be wellimproved, and the defects can be reduced.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy thin plate forming, and in particular relates to a magnesium alloy thin plate heat medium immersion heating hydraulic forming method and device. Background technique [0002] The stamping process can produce various workpieces with complex shapes, and its performance is better than that of casting workpieces, which can avoid the occurrence of casting defects such as porosity and pores, and make magnesium alloy materials have higher strength, better ductility, and more diversification. Therefore, wrought magnesium alloy is expected to become a new high-performance structural material in this century. At present, the research on the magnesium alloy stamping process has achieved preliminary results, and in the stamping process, the deep drawing process is more typical and widely used. Therefore, the research on the deep drawing forming process of magnesium alloy has become one of the main pr...

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Problems solved by technology

Although the forming limit of the magnesium alloy sheet can be improved, the temperature of the magnesium alloy sheet is not uniform. In addition, during the forming process, the magnesium alloy sheet is exposed to the air, and the surface of the magnesium alloy sheet will be oxidized, and the forming The parts obtained by the process are prone to cracking

Mechanical-hydraulic thermoforming is to place the electric tube heating element in the mold, and then heat the mold and the liquid medium. The forming limit of the final formed part can be improved compared with mechanical thermoforming, but in the forming During the process, the temperature unevenness and oxidation of the magnesium alloy sheet still exist

Electric assisted cylindrical hot forming, which uses the heat generated when the current passes through the magnesium alloy plate to heat the magnesium alloy plate, but in the forming process, only the current is allowed to pass through the flange of the deformed workpiece and the part that is in contact with the rounded corner of the mold area, causing the temperature of the magnesium alloy sheet to be uneven

[0005] In recent years, some scholars have proposed a high-energy rate pulsating impact hydroforming equipment (patent number 201621045741.2, authorized announcement number CN206169020U), which combines the advantages of high-speed impact forming and pulsating hydroforming, and completes the parts through multiple impact Incremental forming, which is essentially cold forming, has a limited degree of improvement in the forming limit of the blank, and the device is more complicated and the cost is higher

The cost of the forming device involved in the previous research is high, the temperature of the magnesium alloy sheet is not uniform, and it is not mentioned that the temperature of the magnesium alloy sheet can be made uniform by immersing the forming mold in the heat medium, and the temperature of the magnesium alloy sheet is fully utilized. Oil to implement the process of forming control on the billet

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