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Manufacturing method of aluminum alloy conduit having good bending property

A bending performance and aluminum alloy technology, applied in the field of aluminum alloy, can solve problems such as air leakage, surface quality scratches, etc., and achieve the effect of improving dimensional accuracy and reducing wall thickness difference

Active Publication Date: 2018-04-20
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problems existing in LF2 alloy thin-walled tubes mainly include dimensional accuracy, surface quality (surface scratches, scratches, indentations, indentations), orange peel in bending test and air leakage in flaring airtight test, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Carrying and boring the solid ingot to obtain a hollow ingot; the composition of the solid ingot is: 0.06wt% silicon; 0.16wt% iron; 0.02wt% copper; 0.31wt% manganese; 2.48wt% magnesium 0.01wt% of titanium; 0.22% of the total mass content of iron and silicon; the balance is aluminum.

[0061] The cutting slope of the hollow ingot is 1.5mm; the wall thickness difference of the hollow ingot is 1.6mm; the curvature of the hollow ingot is 0.5mm; the outer diameter deviation of the hollow ingot is -1mm; the hollow ingot The inner diameter deviation of the ingot is +0.5 mm; the length deviation of the hollow ingot is +6 mm; the outer surface roughness of the hollow ingot is ≤ Ra12.5, and the inner surface roughness is ≤ Ra6.3.

[0062] The hollow ingot was extruded on a 2500T extruder after being heated at 480°C to obtain a catheter blank; the extrusion was non-lubricated extrusion, and the length of the perforating needle in the extrusion process was 830 mm; the extrusion Th...

Embodiment 2

[0077] The aluminum alloy conduit is prepared according to the method of Example 1; the difference from Example 1 is that it is extruded on a 600T extruder, and the length of the piercing needle is 240mm; the length of the hollow ingot during the extrusion process is 200mm, and the hollow The ingot had an inner diameter of 25 mm, an outer diameter of 31 mm, and a thickness of 3 mm.

[0078] It is carried out in a 1.5T annealing furnace, the temperature of the empty furnace is set at 485-495 ° C, and the temperature is kept for 15 minutes after reaching the temperature; after the oven is finished, the furnace is charged quickly; after the charge is completed, the furnace door is closed immediately, and the furnace temperature is set to 435 ~ 445°C, keep warm for 25 minutes after reaching the temperature, and the whole process from closing the furnace door to the end of the heat preservation should not exceed 65 minutes. After the heat preservation is over, take it out of the ov...

Embodiment 3

[0081]The aluminum alloy conduit was prepared according to the method of Example 1; the difference from Example 1 is that it was carried out in a 1.5T annealing furnace, the temperature of the empty furnace was fixed at 490-500 ° C, and the temperature was kept for 30 minutes after reaching the temperature; after the oven was finished, the furnace was heated rapidly Loading: Close the furnace door immediately after charging, change the furnace temperature to 440-450°C, keep warm for 30 minutes after reaching the temperature, and the whole process from closing the furnace door to the end of the heat preservation does not exceed 65 minutes. After the heat preservation is over, take it out of the oven quickly, and turn on the fan to cool it down quickly.

[0082] According to the method described in the above technical solution, the tensile strength and surface grain size of the aluminum alloy conduit prepared in Example 3 of the present invention were tested. The test results sho...

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Abstract

The invention provides a manufacturing method of an aluminum alloy conduit having a good bending property. The manufacturing method comprises the steps of sequentially performing heating, extrusion, withdrawal straightening, corrosive washing, rolling, diameter-reducing annealing, drawing, washing, detection and finished product annealing on a hollow ingot to obtain the aluminum alloy conduit, wherein the finished product annealing method comprises the following steps: (1) fixing the temperature of an empty furnace to be 480 to 500 DEG C, maintaining the temperature after the furnace reaches apreset temperature, and baking; (2) after the baking is ended, quickly performing hot-furnace charging to finish charging of the furnace; (3) after charging of the furnace is ended, setting the furnace temperature to be 430 to 450 DEG C, maintaining the temperature and performing annealing treatment; and (4) quickly discharging a product from the furnace after the annealing treatment is ended, and performing air cooling, wherein the time starting from the end point of charging to discharging is shorter than or equal to 65 min. By adopting high-temperature and short-time quick heating, coolingand annealing processes, the manufacturing method provided by the invention can effectively refine grains; the annealing process can be used for obtaining a conduit with a relatively small surface grain size; and the phenomenon of 'Orange Peel', generated in a subsequent bending process, of the aluminum alloy can be prevented.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing an aluminum alloy conduit with good bending performance. Background technique [0002] LF2 alloy thin-walled tubes are widely used in oil conduits of aviation aircraft. At present, the problems existing in LF2 alloy thin-walled tubes mainly include dimensional accuracy, surface quality (surface scratches, scratches, indentations, dents), orange peel in bending test and air leakage in flaring airtight test. [0003] Therefore, there is an urgent need to improve the production process of LF2 catheters to improve their quality. Contents of the invention [0004] In view of this, the object of the present invention is to provide a method for preparing an aluminum alloy conduit with good bending performance. The aluminum alloy conduit prepared by the method provided by the present invention has no "orange peel" during the bending process. [0005] Th...

Claims

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Application Information

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IPC IPC(8): C22F1/047C22C21/06C22C21/08B23P15/00C21D9/08
CPCB23P15/00C21D9/08C22C21/06C22C21/08C22F1/047
Inventor 曾九生
Owner SOUTHWEST ALUMINUM GRP
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