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A kind of preparation method of precision thin-walled large-diameter aluminum alloy pipe

An aluminum alloy, large-diameter technology, applied in the field of metal processing, can solve problems such as large size fluctuations and poor dimensional accuracy

Active Publication Date: 2021-04-02
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is mainly to solve the current problems of poor dimensional accuracy of aluminum alloy pipes such as outer diameter, wall thickness, and straightness, and large dimensional fluctuations between batches of mass production, and to provide a precise, thin-walled, large-diameter aluminum alloy pipe. Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Specification The preparation of the 5A06 aluminum alloy tube, the specific implementation steps are as follows:

[0029] Dimensions of solid ingot: outer diameter 180mm, length 350mm, 1800 tons double-action horizontal extruder, extruded pipe billet outer diameter 65mm, wall thickness 5mm, extruded pipe wall thickness measured at 4 points along the circumference, wall The difference between the maximum and minimum thickness is less than 0.2mm.

[0030] two-roll rolling mill billet for The value of Q is 1.39; the wall thickness of the pipe is measured at 4 points along the circumference after billet opening, and the difference between the maximum value and the minimum value of the wall thickness is less than 0.1mm. two-roll rolling mill billet for The value of Q is 1.47; the wall thickness of the pipe is measured at 4 points along the circumference after blanking, and the difference between the maximum value and the minimum value of the wall thickness is less ...

Embodiment 2

[0034] Specification The preparation of the 2A12 aluminum alloy tube, the specific implementation steps are as follows:

[0035] Dimensions of solid ingot: 180mm in diameter, 350mm in length, 1800 tons of double-action horizontal extruder, extruded tube blank size 75mm in diameter, 2mm in wall thickness, the wall thickness of the extruded tube is measured at 4 points along the circumferential direction, and the wall thickness is the largest The difference between the value and the minimum value is less than 0.2mm.

[0036] The 75×2mm billet is cut into 55×1mm by a two-roll rolling mill, and the Q value is 1.86; after billeting, the wall thickness of the pipe is measured at 4 points along the circumference, and the difference between the maximum value and the minimum value of the wall thickness is less than 0.1mm. The 55×1mm billet was cut into 38×0.5mm by a two-roll rolling mill, and the Q value was 1.62; after the billet was cut, the wall thickness of the pipe was measured ...

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Abstract

The invention discloses a preparation method of a precise thin-wall large-diameter aluminum alloy pipe, and belongs to the technical field of metal processing. The method comprises the following stepsthat 1, perforation extrusion is carried out on a solid ingot, and perforation extrusion is carried out on the aluminum alloy solid ingot by adopting a positive extrusion method of a double-acting extruder so as to obtain a pipe blank; 2, multi-pass two-roller rolling on the basis of the equal-Q value is carried out, a two-roller cold rolling mill is adopted for rolling the pipe blank, and meanwhile, wall thickness correction is carried out, and the two-roller rolling deformation curve adopts an equal-Q value principle, namely, the ratio of the wall thickness reduction amount and the outer diameter reduction amount in the rolling process is a constant value; and 3, a heat treatment process is carried out, and annealing or solid solution treatment is carried out on the rolled finished product pipe. According to the preparation method, on the basis of improving the wall thickness deviation of the pipe, the straightness precision of the pipe is greatly improved; and the measures for preventing the heat treatment deformation of the pipe are adopted in the heat treatment process of a finished product, so that the deformation of the pipe in the heat treatment process is prevented from being changed into elliptic shape and bending.

Description

technical field [0001] The invention relates to a method for preparing a precision thin-walled large-diameter aluminum alloy pipe, belonging to the technical field of metal processing. [0002] technical background [0003] Precision thin-walled large-diameter aluminum alloy pipes are mainly used in aircraft hydraulic, fuel, environmental control and other systems. With the application of CNC flaring and bending equipment in the aviation system, the aluminum tubes originally produced according to the national standard have low dimensional accuracy and a large range of size fluctuations between batches, resulting in a low pass rate of the airtightness of the system after bending and flaring. There are even serious accidents such as breaking down and dripping. The current production and preparation process of large-diameter thin-walled aluminum alloy pipes for aviation is no longer suitable for the development of the current aviation industry. Contents of the invention [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06C22F1/04
Inventor 柴国强胡捷李德富
Owner 有研金属复材技术有限公司
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