Method of machining metallic tubes

a tube and tube body technology, applied in the direction of metal drawing, manufacturing tools, wire straightening devices, etc., can solve the problems of lowering the entire weight of the material used, spd cannot be used to process tubes, and angular pressing (ecap) is only suitable, so as to reduce the thickness of the tube, and improve the mechanical strength of the tube

Inactive Publication Date: 2009-03-05
UAN JUN YEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]An object of the present invention is to provide a method of machining a metallic tube so that the mechanical strength of the metallic tube is improved, the thickness of the metallic tube is reduced and the weight of the metallic tube is lowered.
[0017]The tube is repeatedly and alternatively drawn from the first end and the second end with the dies and the plugs, i.e. the tube is drawn in both drawing directions (an obverse drawing direction and a reverse drawing direction). Hence, the dislocations are produced in the regions neighboring the slip planes such as a first slip plane and a second slip plane that are arranged in different orientations between the grains of the tube. Lots of dislocations are produced in the tube, which enhances and improves the mechanical strength of the tube, reduces the thickness of the tube and simultaneously lowers the weight of the tube.

Problems solved by technology

Thus, using less metallic material processed by SPD can provide the same mechanical strength, which results in lowering the entire weight of the material used.
However, SPD such as equal channel angular pressing (ECAP) is only suitable for processing solid cylinders or bars.
SPD cannot be not used to process tubes.
Thus, the mechanical strength of the tube cannot be efficiently improved or enhanced.

Method used

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  • Method of machining metallic tubes
  • Method of machining metallic tubes
  • Method of machining metallic tubes

Examples

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embodiment 1

[0038]For machining a 7050 Al—Zn—Mg aluminum tube as an example, before machining the tube, the original external diameter of the tube is 31 millimeters, the original internal diameter of the tube is 25 millimeters, the thickness of the tube is 3 millimeters, and the length of the tube is 250 millimeters. A predetermined thickness of the tube is 1.5 millimeters after machining. This embodiment illustrates reducing the external diameter of the tube from 31 millimeters to 28 millimeters, while the internal diameter of the tube is still kept at 25 millimeters after machining.

[0039]The tube is annealed at 430° C. for one hour, and furnace cooled. The annealing treatment softens the tube. A portion (about 25 millimeters in length) of the tube at the first end is necked to form the first pressing portion. A soap treatment is performed to the surface of the tube, which coats a layer of solid soap material on the surface of the tube. The soap treatment may immerse the tube in sulfurized oil...

embodiment 2

[0044]For machining a 7050 Al—Zn—Mg aluminum tube as an example, before machining the tube, the original external diameter of the tube is 31 millimeters, the original internal diameter of the tube is 25 millimeters, the thickness of the tube is 3 millimeters, and the length of the tube is 250 millimeters. A predetermined thickness of the tube is 1.5 millimeters after machining. This embodiment illustrates increasing the internal diameter of the tube from 25 millimeters to 28 millimeters, while the external diameter of the tube is still kept at 31 millimeters after machining.

[0045]The tube is annealed at 430° C. for one hour, and furnace cooled. The annealing treatment softens the tube. A portion (about 25 millimeters in length) of the tube at the first end is necked to form the first pressing portion.

[0046]A soap treatment is performed to the surfaces including an exterior surface and an interior surface of the tube, which coats a layer of soap material on each surface of the tube. ...

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Abstract

A method of machining a tube includes performing an obverse drawing process to the tube, where the obverse drawing process draws the tube in an obverse drawing direction from a first end toward a second end of the tube. The tube is turned around to perform a reverse drawing process, where the reverse drawing process draws the tube in a reverse drawing direction from the second end toward the first end of the tube. The obverse and the reverse drawing processes are alternately performed until the tube is thinned to a desired thickness.

Description

RELATED APPLICATIONS[0001]The application claims priority to Taiwan Application Serial Number 96132107, filed Aug. 29, 2007, which is herein incorporated by reference.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates to method of machining tubes. More particularly, the present invention relates to a method of machining metallic tubes, which improves mechanical strength of the processed metallic tubes while the weight of the processed metallic tubes is reduced.[0004]2. Description of Related Art[0005]Metallic tubes have extensive applications in various industrial products and fields. Fabricating mechanically strong, light tubes are long-term objectives for skilled people in this art. Thus, various approaches including improved machining methods and metallic materials (such as alloy) have been continuously developed and suggested.[0006]Severe plastic deformation (SPD) is a processing method to improve the mechanical strength of metallic materials. SPD refin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B21C37/06
CPCB21C1/18B21C1/24B21C1/26B21F1/00B21C9/005B21C19/00B21C37/155B21C1/34
Inventor UAN, JUN-YENTSAI, TE-CHANG
Owner UAN JUN YEN
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