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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

The present invention provides a method for machining metallic tubes to improve their mechanical strength, reduce their thickness, and lower their weight. The method involves performing an obverse drawing process to the tube, then reversing the process to perform a reverse drawing process. This process is alternated until the tube is thinned to the desired thickness. The method can also involve forming a first pressing portion at one end of the tube, inserting a plug into the tube, and drawing it out of an eye hole. The process is repeated with a second pressing portion at the other end. The method produces dislocations in the tube, which enhances its mechanical strength, reduces its thickness, and lowers its weight.

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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