Coextrusion processing method of magnesium alloy

Abstract

The invention discloses a coextrusion processing method of a magnesium alloy. According to the method, a coextrusion mould is adopted, wherein the coextrusion mould comprises an upper end vertical extrusion channel. The method comprises the following steps of: step one, carrying out homogenization treatment on a magnesium alloy casting blank material; step two, heating the coextrusion mould, wherein the temperature of the coextrusion mould is 10 DEG C-30 DEG C lower than that of the magnesium alloy blank material, and a lubricating agent is uniformly coated on extrusion channel of the coextrusion mould after being heated; and step three, heating the magnesium alloy blank material subjected to homogenization treatment to 250 DEG C-400 DEG C, carrying out one-way uniform speed extrusion from the upper end of the magnesium alloy blank material so as to ensure that the magnesium alloy blank material flows and is subjected to compressional deformation towards an S type channel from the vertical channel. According to the coextrusion processing method provided by the invention, the coextrusion deformation technology is adopted, thus refinement effect of magnesium alloy grains is greatly improved, the comprehensive mechanical property of a magnesium alloy material is improved, and heat treatment gate and a complicated compressional deformation working procedure in the compressional deformation process are reduced.

Description

technical field [0001] The invention relates to a composite extrusion processing method, in particular to a composite extrusion processing method of a magnesium alloy. Background technique [0002] Magnesium alloy has the characteristics of low density, the highest specific modulus and second only to titanium alloy as a metal structural material, and has the characteristics of good damping and shock absorption performance, electromagnetic shielding performance and excellent cutting performance. It is known as 21 Century's clean structural materials that can be recycled greenly and do not pollute the environment, especially to achieve lightweight components / parts, have irreplaceable advantages. With the development needs of lightweight industries such as aerospace vehicles, weapons and equipment, vehicles, and electronic products, the application prospects of magnesium alloys are very broad. [0003] Magnesium belongs to the hexagonal crystal structure, and only one group of...

AI Technical Summary

Problems solved by technology

Chinese patent No. 200710092779.4 invented a unidirectional extrusion radial flow extrusion method with variable diameter angle, extrusion temperature 200 ℃ ~ 350 ℃, extrusion speed 1.0m / min ~ 2.5m / min, extrusion ratio 20-40, using a billet with an initial grain size of 200 μm, after one extrusion, the grain is refined to about 20 μm, but in the transition area between the vertical extrusion cavity channel of the mold and the transverse variable diameter cavity channel, Deformation stress concentration leads to mold cracking, complex control, short mold life, relatively high cost, and poor surface quality of magnesium alloy, unstable performance

Therefore, there are still considerable difficulties in the promotion and application of technologies such as ECAE for the improvement of the production efficiency of magnesium alloys in modern industrial production and the continuous improvement of the performance of magnesium alloy products.

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