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Fast 7075 aluminium alloy shape extruding process

An aluminum alloy profile and extrusion method technology, which is applied in the field of non-ferrous metal processing, can solve the problems of uneven deformation structure, low extrusion speed, and increase in profile temperature, and achieves prevention of periodic extrusion cracks, uniform cooling, and prevention of fracture. or the effect of fuse

Active Publication Date: 2006-08-02
GUANGDONG XINGFA ALUMINUM
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] Due to the performance of the 7075 aluminum alloy itself, under conventional extrusion conditions, the excessive extrusion speed makes the temperature of the profile rise rapidly, and it is easy to produce extrusion defects such as periodic extrusion cracks and uneven deformation structures on the surface of the profile. The allowable extrusion speed is very low, generally in the range of 0.5 to 2 m / min, such a low extrusion speed seriously restricts the improvement of the production efficiency of 7075 aluminum alloy profiles
Therefore, so far, there is no rapid extrusion method for 7075 aluminum alloy profiles.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] 7075 aluminum alloy profiles rapid extrusion method, the steps of the method are as follows:

[0024] 1. First design the cross-sectional view of the 7075 aluminum alloy profile product, then design and manufacture the extrusion die 5 and the extrusion die pad 6, etc. according to the profile cross-sectional view, and reserve a place to install the cooling medium intake pipe, and select a 2200-ton extrusion machine; The ratio is 26;

[0025] 2. The section shape of the profile is circular with a diameter of 32mm. There are 4 intake pipes for cooling, one of which is used to cool the extrusion die; the other three are used to cool the extruded profile at the exit of the die, and the three are symmetrically distributed at 120° to each other, such as figure 2 shown;

[0026] 3. According to the composition requirements of 7075 aluminum alloy, melt and cast 7075 aluminum alloy cast rod 4 with a diameter 1-2 mm smaller than that of extrusion cylinder 1, perform homogeniza...

Embodiment 2

[0032] Except that the cooling medium used in cooling the extrusion die and extrusion profile in step 5 is changed to "the medium for cooling the extrusion die is bottled liquid nitrogen, and the medium for cooling the extrusion profile is bottled nitrogen" and the section of the profile can be respectively Change to one of square, rectangle or other geometric shapes, the rest are the same as the steps of embodiment 1.

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Abstract

The present invention discloses the fast extrusion process of type-7075 aluminum alloy shape suitable for use in different extruders of different sizes to produce aluminum alloy shape with homogeneous cooling and no extruded crack in high extrusion speed. The present invention features the hot extrusion process of producing type-7075 aluminum alloy shape in circular, rectangular or other cross section shape, and the cooling of extruding mold and extruded shape in the mold outlet with gaseous or liquid nitrogen to realize fast extrusion. During the extrusion, the flow rate of gaseous or liquid nitrogen is controlled with valve to 1-30 L / min, the nitrogen pipes are in the number and distribution determined by different cross section shape of the extruded shape, and extrusion speed is 4-12 m / min.

Description

technical field [0001] The invention relates to a nonferrous metal processing method, more specifically to a rapid extrusion method for 7075 aluminum alloy profiles. Background technique [0002] Due to the performance of the 7075 aluminum alloy itself, under conventional extrusion conditions, the excessive extrusion speed makes the temperature of the profile rise rapidly, and it is easy to produce extrusion defects such as periodic extrusion cracks and uneven deformation structures on the surface of the profile. The allowable extrusion speed is very low, generally in the range of 0.5 to 2 m / min. Such a low extrusion speed seriously restricts the improvement of the production efficiency of 7075 aluminum alloy profiles. Therefore, so far, there is no rapid extrusion method for 7075 aluminum alloy profiles. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a rapid extru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/14B21C29/00
Inventor 吴锡坤陈文泗
Owner GUANGDONG XINGFA ALUMINUM
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