Controllable gas-assisted light alloy metal plate cold mold hot forming method

Abstract

The invention relates to a controllable gas-assisted light alloy metal plate cold mold hot forming method. An adopted forming die comprises a female die, a male die and a blank pressing flange. The forming method comprises the steps of design and manufacturing of the forming die, light alloy solution treatment, light alloy cold die hot forming and light alloy part die assembly quenching. Aiming at the characteristics of heat exchange and non-uniform temperature field between a cold mold hot forming die and a plate blank, a cooling gas path is constructed on the forming die, and a controllable gas assisting manner is utilized, so that 1) in the forming process, the temperature field of the plate blank is regulated and controlled, the reasonable distribution of flow stress is realized, and the flow of a material is further controlled; and 2) in the die quenching process, the local cooling speed of a deformed part is regulated and controlled, controllable and adjustable gradient cooling is achieved, and then the structure and mechanical properties of the part are guaranteed. An advanced die manufacturing method is provided for hot forming of light alloy complex integral parts, and the problems of cracking and uneven performance and wall thickness distribution existing in hot forming of light alloy are solved.

Description

technical field [0001] The invention relates to the technical field of cold mold thermoforming, in particular to a controllable gas-assisted cold mold thermoforming method for light alloy sheet metal. Background technique [0002] High-performance light alloys (high-strength aluminum alloys, titanium alloys) are important main materials for aerospace, automobiles, and high-speed rail. Complex light alloy sheet metal integral parts are ideal structures for carrying equipment to achieve lightweight and high reliability. However, light alloys have poor plasticity at room temperature, low ductility, severe springback after forming, and it is difficult to form complex shapes. If the method of block forming and re-welding is adopted, there are long welds and cross welds, which seriously restrict the reliability of the parts. At the same time, the shape distortion caused by welding stress cannot guarantee the overall accuracy of the parts; multi-pass forming and re-welding, The p...

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