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Method for preparing magnesium alloy section bar by continuous corner shearing and squeezing shaping and mold

A magnesium alloy and corner technology, applied in metal extrusion dies, metal extrusion control equipment, metal extrusion, etc., can solve the problems that the degree of refinement cannot reach 1/2, the production efficiency is reduced, and the product quality is reduced. , to achieve the effect of improving smoothness, less slippage and improving uniformity

Inactive Publication Date: 2009-04-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties of the magnesium alloy can be improved through discontinuous multi-pass extrusion deformation by using this kind of die, the degree of refinement of the magnesium alloy grain size cannot reach 1 / 2 after each extrusion pass. The magnesium alloy billet with a grain size of 210 μm is extruded and deformed by ECAE technology, and the grain size of the magnesium alloy can only reach below 10 μm after eight discontinuous extrusions. To a small extent, but because of the multi-pass extrusion process, its production efficiency is reduced; and because the extrusion speed of ECAE technology is 0.6-1.2m / min, the extrusion time of each pass is relatively long, and the same As a result, its production efficiency is reduced. If the extrusion speed of unidirectional extrusion is to be increased, the product quality will be reduced.
Therefore, under the situation that industrialized production needs to improve production efficiency, existing unidirectional extrusion die obviously has deficiencies.

Method used

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  • Method for preparing magnesium alloy section bar by continuous corner shearing and squeezing shaping and mold
  • Method for preparing magnesium alloy section bar by continuous corner shearing and squeezing shaping and mold
  • Method for preparing magnesium alloy section bar by continuous corner shearing and squeezing shaping and mold

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Set the extrusion ratio to 9, take a magnesium alloy billet of grade AZ31 with a diameter of Ф90mm, and homogenize the billet. The condition is to heat the billet to 400°C for 10 hours. At this time, the grain diameter of the billet is about 50 microns. Under the condition that the extrusion temperature is 300 degrees Celsius, the extrusion speed is 3 m / min, the extrusion cylinder and the die are heated to 275 degrees Celsius, and graphite is used as a lubricant, the magnesium alloy billet is extruded according to the above method. The length h of the working belt of the extrusion channel is 3mm; the two corners of the channel γ 1 , γ 2 Both are 90°, the diameter d of the bar in the extrusion stage 2 It is Ф40mm. The finished diameter d3 (finished product) of the extruded bar after shaping is Ф30mm. The microstructure observation of the extruded magnesium alloy shows that the grains are evenly distributed, fine and round equiaxed grains, with an average size of about ...

Embodiment 2

[0043] Set the extrusion ratio to 25, take a magnesium alloy casting slab with the brand name AZ31 and a diameter of Ф80mm, the state of the slab is extruded, and homogenize the slab. The condition is to heat the slab to 400°C for 12 hours. When the blank grain diameter is about 20 microns. The extrusion temperature is 300°C, the extrusion speed is 3m / min, the extrusion barrel and die are heated to 275°C, graphite is used as lubricant, and the magnesium alloy billet is extruded according to the above method, the length of the working zone of the extrusion channel is h 3mm; the two corners of the channel γ 1 , γ 2 Both are 120°, the diameter d of the bar in the extrusion stage 2 It is Ф20mm. Then carry out homogenization treatment at 400 degrees Celsius for 10 hours, and the finished diameter of the extruded rod after shaping is d 3 (Finished product) is Ф16mm. The microstructure observation of the magnesium alloy after extrusion reveals that the grains are uniformly distr...

Embodiment 3

[0045] Set the extrusion ratio to 4, take a magnesium alloy billet of the brand AZ 31 and a diameter of Ф6mm, the state of the AZ31 billet is extruded, and homogenize the billet. The condition is to heat the billet to 380°C for 12 hours. At this time, the grain diameter of the billet is about 35 microns, see the attached figure 2 . The extrusion temperature is 325°C, the extrusion speed is 3m / min, the extrusion cylinder and the mold are heated to 300°C, graphite is used as a lubricant, and the magnesium alloy billet is extruded according to the above method. The length h of the working belt of the extrusion channel is 2mm; the two corners of the channel γ 1 , γ 2 Both are 90°, the diameter d2 of the bar in the extrusion stage is Ф6mm, and the finished diameter d3 (finished product) of the extruded bar after shaping is Ф3mm, see image 3 and Figure 4 . The microstructure observation of the magnesium alloy after extrusion reveals that the grains are uniformly distributed ...

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Abstract

The invention relates to a method for preparing a magnesium alloy section through continuous angle rotation shearing, extrusion and shaping and a mould. The method comprises the following steps: (1) a magnesium alloy blank material is subjected to homogenization treatment; (2) a mould of an extrusion mould with a plurality of angle rotation and molding is preheated; and the inside of a mould passage is evenly coated with lube; (3) an extrusion cylinder is heated to a temperature of between 175 and 325 DEG C; and (4) the homogenized blank material is heated to a temperature of between 200 and 350 DEG C; the extrusion ratio of the extrusion mould is between 4 and 100; and the magnesium alloy blank material is subjected to unidirectional extrusion at an extrusion speed of between 3 and 6 m / min so that the magnesium alloy blank material is subjected to compression and extrusion with high extrusion ratio and equal passage extrusion with a plurality of angle rotation. The magnesium alloy material prepared through the method has an ultrafine crystal grain structure, has the advantages of substantially improving the plasticity, low temperature superplasticity and high strain speed of the magnesium alloy material and has high yield stress.

Description

technical field [0001] The invention relates to the field of extrusion deformation preparation of high-performance magnesium alloys, in particular to a method and mold for preparing magnesium alloy profiles by continuous angular shear extrusion shaping. Background technique [0002] Grain refinement and texture control are one of the effective ways to improve and enhance the performance of magnesium alloy materials. Using the traditional forging, extrusion, rolling and subsequent recrystallization annealing process, although the grain size can reach below 10 μm and form deformation texture and / or recrystallization texture, it is still difficult to meet the requirements for high-performance materials. Require. Materials prepared by large plastic deformation technology usually have an ultra-fine grain structure, and UFG materials with a grain size of less than 1 μm can be obtained and special texture components are formed, so they have excellent mechanical properties and perf...

Claims

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Application Information

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IPC IPC(8): B21C23/02B21C25/02B21C29/00B21C31/00B21C23/01B21C23/32
Inventor 张丁非胡红军刘杰慧
Owner CHONGQING UNIV
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