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A preparation method of high-precision small-diameter thin-walled flarable bendable aluminum alloy pipe

A small-diameter, high-precision technology, applied in the field of metal processing, can solve the problems of cracking, easy generation of wrinkles, coarse grains, etc., and achieve the effect of grain refinement, improvement of processing efficiency, and fine circumferential and axial grains.

Active Publication Date: 2022-02-08
有研金属复材技术有限公司
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is mainly to solve the problems of the current aviation small-diameter aluminum alloy finished pipes, which have coarse grains and are prone to wrinkles and cracks in the subsequent bending and flaring process, and provide a high-precision small-diameter pipe with fine structure and excellent formability. Pipe preparation and processing method

Method used

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Examples

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Effect test

preparation example Construction

[0021] The preparation method of the high-precision small-diameter thin-walled flarable aluminum alloy pipe of the present invention comprises the following steps:

[0022] (1) Cut the extruded tube blank of a specific length; the wall thickness of the extruded tube blank is 3-5mm; the outer diameter is controlled at 30-60mm; ensure that the inner surface finish of the tube blank reaches Ra3.2 or above;

[0023] (2) The tube blank obtained in step (1) is rolled and opened by a two-roll cold rolling mill, and the deformation of each pass is 50% to 80%; the wall thickness is controlled at 1.5 to 2.3 mm, and the outer diameter is controlled at 15 to 10 mm. 28mm; rolling speed 30-70 times / min, each feed 1-4mm;

[0024] (3) Anneal the tube blank obtained in step (2) to eliminate work hardening, the annealing temperature is 350°C-450°C, and the holding time is 0.5-2h;

[0025] (4) The tube blank obtained in step (3) is subjected to three-wheel powerful spinning deformation for one ...

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Abstract

The invention relates to a preparation method of a high-precision small-diameter thin-walled flarable bendable aluminum alloy pipe, which belongs to the technical field of metal processing. The method includes: (1) cutting a certain length of aluminum alloy extruded tube blank; (2) carrying out one-time two-roll rolling blanking of the tube blank in step (1); (3) rolling the tube blank obtained in step (2) Perform stress relief annealing to eliminate work hardening; (4) carry out three-wheel powerful spinning deformation on the tube blank obtained in step (3), and cut off the spinning pressure; (5) perform small deformation on the tube blank obtained in step (4) Measuring and reducing the diameter; (6) heat-treating the pipe obtained in step (5) to obtain a finished pipe. The axial and circumferential structure of the finished pipe of the present invention is refined, the mechanical properties are excellent, and the excellent flaring and bending forming performance of the finished product is guaranteed; the billet is opened by using two rollers with a large reduction to reduce the diameter to ensure sufficient deformation of the billet and fine grains At the same time, the processing efficiency of the pipe is improved, so that the pipe prepared by the invention is more economical.

Description

technical field [0001] The invention relates to a preparation method of a high-precision small-diameter thin-walled flarable bendable aluminum alloy pipe, which belongs to the technical field of metal processing. Background technique [0002] Small-diameter thin-walled aluminum alloy pipes are mainly used in aircraft environmental control, hydraulic, fuel and other systems. Small-diameter thin-walled aluminum alloy pipes are usually produced by perforated extrusion + multi-pass drawing. Due to the small amount of thinning in the drawing pass, multiple annealing is required during the drawing process, and the grains are difficult to break during the forming process. , The finished pipe has a thick structure, and is prone to defects such as wrinkles after bending and flaring. The airtightness of the system is low, and even serious accidents such as breakdown and leakage occur. Contents of the invention [0003] The purpose of the present invention is mainly to solve the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06C21D9/08C22F1/04
CPCB21C37/06C21D9/08C22F1/04Y02P10/20
Inventor 柴国强李德富胡捷
Owner 有研金属复材技术有限公司
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