Magnesium alloy construction member step temperature forming method

Abstract

The invention provides a magnesium alloy construction member step temperature forming method. The method comprises the process route, namely homogenizing, preforming, warm forming and low temperature forming and is characterized in that: 1, in the stage of homogenizing and preforming, homogenizing is carried out in a heating furnace, and upsetting and preforming are directly carried out by utilizing a blank homogenizing temperature, wherein the thermal temperature of preforming is 380 minus or plus 10 DEG C; 2, in the stage of warm forming, warm extrusion forming is carried out on the preformed upsetting blank in a mould, wherein the warm forming temperature is 340 minus or plus 10 DEG C; and 3, in the stage of low temperature reshaping, low temperature reshaping is carried out on a semi-formed blank obtained after the warm forming is finished in the mould again, wherein the low temperature reshaping temperature is 300 minus or plus 10 DEG C. By adopting the method provided by the invention, the problems that high temperature forming performance of a magnesium alloy is low and the magnesium alloy can not be formed at a low temperature are solved, coordination and uniform of forming and toughening on the magnesium are realized, and product performance is improved; and energy sources are saved, the process is simplified, and waste heat of homogenizing is utilized to directly carry out subsequent plastic deformation, thus the process is simplified, the thermal energy is effectively utilized, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy product manufacturing, and mainly aims at a processing technology proposed for the plastic forming of magnesium alloy high-performance components. Background technique [0002] Magnesium alloy has low density, and the cost of material structure can be reduced by more than 30% compared with aluminum. It is the best material for component cost reduction, automobile energy saving and emission reduction, and weapon lightweight. Due to the poor plasticity of magnesium alloy itself, the manufacturing method of its parts is greatly limited. For example, the traditional forming method is mainly based on casting, and its strength is less than 220MPa; although ordinary plastic forming can reach 350MPa, compared with high-strength aluminum alloy (550MPa), the effect of reducing the weight of components is not obvious; The manufacturing method of magnesium alloy parts has low production efficiency, h...

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Problems solved by technology

Due to the poor plasticity of magnesium alloy itself, the manufacturing method of its parts is greatly limited

For example, the traditional forming method is mainly based on casting, and its strength is less than 220MPa; although ordinary plastic forming can reach 350MPa, compared with high-strength aluminum alloy (550MPa), the effect of reducing the weight of components is not obvious; The production efficiency of magnesium alloy parts is low, the production conditions are harsh, and the requirements for raw materials are high, so that the advantages of plastic forming (high productivity, improved material strength and toughness) have not been shown; in addition, although some special methods can obtain high-strength magnesium alloys , such as rapid solidification, equal channel extrusion, etc., but the product size is limited, it is difficult to put into practical application

The current forming technology cannot give full play to the potential of magnesium alloys, and cannot meet the strength requirements of important components, which greatly limits the application of magnesium alloys

[0003] Plastic deformation can improve its performance, and its strengthening effect on magnesium alloy is 4 times that of aluminum alloy, but magnesium alloy with hexagonal crystal structure has poor plasticity, and its performance is sensitive to deformation parameters, which makes it difficult to form complex parts. Important parts have to be forged with high-purity magnesium alloy Coarse rough blanks are processed by machine, and the key technology of plastic forming has not been solved, which leads to low forging high-quality products and high manufacturing costs

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