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A kind of optimized preparation method of lf2 aviation catheter

A catheter and aviation technology, applied in the field of aluminum alloy, can solve problems such as air leakage, surface quality scratches, etc., and achieve the effect of sufficient annealing, good quality and good ventilation

Active Publication Date: 2020-09-01
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

[0064] 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.

[0065] The cutting slope of the hollow ingot is 2mm; the wall thickness difference of the hollow ingot is 2mm; the curvature of the hollow ingot is 0.5mm; the outer diameter deviation of the hollow ingot is +1mm; The inner diameter deviation 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.

[0066] The hollow ingot is heated to 480°C in induction heating and then extruded on a 2500T extruder to obtain a catheter blank; the extrusion is non-lubricated extrusion, and the length of the perforating needle during the extrusion process is 630mm The length of the hollow ingot in...

Embodiment 2

[0083] Carrying and boring the solid ingot to obtain a hollow ingot; the composition of the solid ingot is: 0.06wt% silicon; 0.18wt% iron; 0.02wt% copper; 0.26wt% manganese; 2.29wt% magnesium ; 0.02wt% titanium; the total mass content of iron and silicon is 0.21%; the balance is aluminum.

[0084]The slope of the hollow ingot is 1.5mm; the wall thickness difference of the hollow ingot is 0.75mm; the curvature of the hollow ingot is 0.5mm; the deviation of the outer diameter 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.

[0085] The hollow ingot is heated to 450°C in induction heating and extruded on a 630T extruder to obtain a catheter blank; the extrusion is non-lubricated extrusion, and the length of the perforating needle during the extrusion process is 240mm The len...

Embodiment 3

[0102] Carrying and boring the solid ingot to obtain a hollow ingot; the composition of the solid ingot is: 0.06wt% silicon; 0.15wt% iron; 0.02wt% copper; 0.26wt% manganese; 2.49wt% magnesium ; 0.02wt% titanium; the total mass content of iron and silicon is 0.24%; the balance is aluminum.

[0103] The cutting slope of the hollow ingot is 1.7mm; the wall thickness difference of the hollow ingot is 1.8mm; 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 +1 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.

[0104] The hollow ingot was heated to 520°C by induction heating and then extruded on a 2500T extruder to obtain a catheter blank; the extrusion was non-lubricated extrusion, and the length of the perforating needle during the extrusion process was 830mm ...

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Abstract

The invention provides an optimization preparation method of an LF2 aviation guide pipe. The optimization preparation method comprises the following steps of heating, extruding, puling and correcting,etching, rolling, diameter reducing annealing, drawing, straightening, cleaning, detection and finished product annealing for a hollow ingot are carried out in sequence, so that an aluminum alloy conduit is obtained. According to the method, the cutting inclination, the wall thickness difference and the curvature degree of the hollow ingot are specifically controlled, so that the prepared conduithas good dimensional accuracy; the aluminum alloy conduit is prepared by adopting a non-lubricating extrusion process under the specific perforation needle length, and the aluminum alloy conduit withgood inner surface quality is obtained under the condition that the perforating needle is not damaged in the extrusion process; a high-temperature short-time and rapid heating cooling annealing process is adopted, so that a guide pipe with a small surface grain size is obtained, and the phenomenon that the aluminum alloy generates "orange peel" in the follow-up bending process is avoided. According to the optimization preparation method, the LF2 aviation guide pipe with good quality is prepared under the comprehensive action of various processes.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to an optimized preparation method of an LF2 aviation catheter. 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 purpose of the present invention is to provide an optimized preparation method for LF2 aviation catheters. The method provided by the invention can prepare catheters with good dimensional accuracy and internal surface quality, and no "orange peel" occurs in the bending process of the cathe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C21D9/08C22C21/06C22C21/08C22F1/047
CPCB23P15/00C21D9/08C22C21/06C22C21/08C22F1/047
Inventor 曾九生
Owner SOUTHWEST ALUMINUM GRP
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