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A metal fine-grained material extrusion method, extrusion die and application

An extrusion die and fine-grain technology, which is applied in the field of plastic processing, can solve the problems of accelerated die wear, ineffective improvement of mechanical properties, and coarse internal grains, so as to improve the degree of cumulative deformation, enhance research and production value, and realize The effect of large plastic deformation

Active Publication Date: 2017-05-03
淄博德源金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not suitable to use a particularly large extrusion ratio (more than 100) when using the traditional one-shot extrusion method, because as the extrusion ratio increases, the required extrusion force also increases, the wear of the mold is accelerated, and it is easy to damage
In the case of relatively small extrusion, the extrusion process cannot significantly refine the grains, and the effect of improving the mechanical properties is not obvious
[0003] At present, the processing cost of aluminum alloy extrusion ranges from about 1000 / ton to 2000 / ton. The production efficiency of one extrusion is high, and repeated extrusion will significantly increase the production cost, which is many times the cost of a single extrusion. Proportional to the number of presses
In addition, a single extrusion will cause the material to have uneven structure, fine grains on the surface of the profile, and relatively coarse internal grains (micron scale)

Method used

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  • A metal fine-grained material extrusion method, extrusion die and application
  • A metal fine-grained material extrusion method, extrusion die and application
  • A metal fine-grained material extrusion method, extrusion die and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a metal fine-grained material by extrusion, comprising the steps of:

[0037] 1) Hot extruding the 6082 aluminum alloy into an intermediate billet with a section of 1 / 4 of the original billet;

[0038] 2) Then cut the intermediate blank into 4 sections of equal length;

[0039] 3) Heat the 4-stage intermediate blank to 450°C for 0.5 hours;

[0040] 4) Combining cylindrical new blanks into hot extrusion processing, extruding a new intermediate blank with a section of 1 / 4 of the original blank;

[0041] 5) repeat the above process (process 2)-process 4)) 2 times;

[0042] 6) Combined into a cylindrical new billet for hot extrusion processing, and process it into the target product.

[0043] In this example, the extrusion speed is 5m / min, and the extrusion ratio of the final product is 20.

[0044] Carry out experiments with n being 5, 6, and 8 in the same way, such as Figure 1-3 shown.

Embodiment 2

[0046] The difference between this embodiment and Embodiment 1 is that the material used in this embodiment is AZ31 magnesium alloy; the intermediate blank is the original regular polygonal blank section 1 / n (n is the number of regular polygons), and the number of repeated extrusions is 2 times ; The intermediate heating temperature is 400°C, the holding time is 1 hour; the extrusion speed is 2m / min, and the extrusion ratio of the final product is 15.

[0047] Regular polygons are regular quadrilaterals, regular pentagons, regular hexagons and regular octagons, such as Figure 4-5 As shown, regular polygons can also be transformed into other regular polygons.

Embodiment 3

[0049] The difference between this embodiment and Embodiment 1 is that the material used in this embodiment is ZAT10 zinc alloy; the intermediate blank is 1 / n (n is a multiple of 2) of the original circular blank section, and the number of repeated extrusions is 3 times; The extrusion temperature is 300° C., the extrusion speed is 6 m / min, and the extrusion ratio of the final product is 60.

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PUM

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Abstract

The invention discloses a metal fine grain material extruding method, an extruding mold and an application. The metal fine grain material extruding method comprises the following steps: (1) carrying out hot extrusion on a metal blank until the metal blank is changed into intermediate blanks of which the cross sections are 1 / n of the cross section of the original blank, wherein n is an integer greater than 2; and (2) after n sections of the intermediate blanks with the equal lengths are combined into a new blank, repeating the process of the step (1), and obtaining the targeted metal fine grain blank after repeating for set times, wherein the shape of the cross section of the metal blank is suitable so that the metal blank can be divided equally. By the method, the metal blank is subjected to extrusion machining repeatedly, extruded bars with fan-shaped cross sections or triangular cross sections are combined into a round bar or a regularly polygonal bar for extrusion, on one hand, fine grains can be refined further remarkably, on the other hand, fine grains at different positions such as the surface and the inside of the extruded bar can be even further through extrusion, and the sizes of the grains of the surface and the inside of the bar are the same. Accumulated deformation degree of the material is improved, and the grains can be refined effectively, so that the mechanical property of a finally extruded product is improved.

Description

technical field [0001] The invention belongs to the field of plastic processing, and in particular relates to an extrusion method for metal fine-grained materials, an extrusion die and its application. Background technique [0002] During the extrusion process, the material is subjected to three-dimensional compressive stress, which can significantly improve the plasticity. Extruded metal ingots are divided into: fine-grain equiaxed zone, columnar crystal zone and coarse equiaxed zone from the outside to the inside. Therefore, when the traditional extrusion process is used, affected by the initial structure, the thickness of the extruded profile is not uniform, and the mechanical properties not tall. The extrusion ratio refers to the ratio of the cross-sectional area of ​​the extrusion cylinder to the total cross-sectional area of ​​the extruded product, also known as the extrusion coefficient. The extrusion ratio is a parameter used to indicate the amount of metal deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00
CPCC22F1/00
Inventor 刘运腾林涛周吉学王金伟庄海华
Owner 淄博德源金属材料有限公司