A kind of preparation method of aluminum alloy conduit with high inner surface quality

A technology of aluminum alloy and inner surface, applied in the field of aluminum alloy, can solve the problems of air leakage and excessive grain size, and achieve the effect of improving dimensional accuracy and reducing wall thickness difference

Active Publication Date: 2020-02-14
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, dents), orange peel in bending test (grain size is too large) and leakage in flaring airtightness test. Qi and other issues

Method used

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  • A kind of preparation method of aluminum alloy conduit with high inner surface quality
  • A kind of preparation method of aluminum alloy conduit with high inner surface quality

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 1.6mm; the wall thickness difference of the hollow ingot is 1.7mm; 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] After the hollow ingot was heated at 480°C, it was extruded on a 2500T extruder to obtain a catheter blank; the extrusion was non-lubricated extrusion, and the length of the perforating needle in the extrusion process was 730mm; the extrusion T...

Embodiment 2

[0071] 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.

Embodiment 3

[0073] The aluminum alloy conduit was prepared according to the method of Example 1; the difference from Example 1 was that the heating temperature was 430°C

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Abstract

The invention provides a preparation method of an aluminum alloy guide pipe with high inner surface quality. The preparation method comprises the following steps: heating, no-lubrication extrusion, drawing and correction, erosion washing, rolling, reducing annealing, drawing and straightening are performed on a hollow ingot in sequence to obtain the aluminum alloy guide pipe; in the extruding process, the length of the hollow ingot is not more than 350 mm; and in the extruding process, the length of a puncture needle is 200-850 mm. Under the specific length of the puncture needle, the no-lubrication extrusion process is adopted to prepare the aluminum alloy guide pipe; and the method obtains the aluminum alloy guide pipe with high inner surface quality under the condition of guaranteeing no damage of the puncture needle in the extruding process.

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 high inner surface quality. 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, indentations), orange peel in bending test (grain size is too large) and leakage in flaring airtightness test. gas etc. [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 a high-quality inner surface, and the method provided by the present invention can prepare an aluminum alloy conduit with a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 曾九生
Owner SOUTHWEST ALUMINUM GRP
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