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Manufacture of metal tubes

A seamless tube and tube blank technology, applied in the field of metal tubes, can solve problems such as deterioration of internal surface quality

Inactive Publication Date: 2006-12-06
敏忆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The assembly gap or spacing between the core and the tube blank may also cause deterioration of the internal surface quality

Method used

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  • Manufacture of metal tubes
  • Manufacture of metal tubes
  • Manufacture of metal tubes

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] In a preferred aspect, the present invention provides a method of making tubes of shape memory alloys, such as binary nitinol and its modified ternary and quaternary compositions, with precisely controlled outer diameter (OD) and inside diameter (ID), wall thickness, and improved OD and ID finish. The method includes:

[0019] 1. To provide an assembly comprising (a) a metal tube stock and (b) an elongated metal core surrounded by the tube stock and in wired contact with a minimum clearance, and between the core and the tube Between can advantageously use a lubricant;

[0020] 2. Elongation of the assembly by machining which can be carried out at an elevated temperature (thermal working) where the core and the blank have similar plastic flow rates until the tube blank has been converted to the desired diameter A pipe, or cold stretched from an annealed state;

[0021] 3. heat treating the elongated component while straightening the component under longitudinal stress...

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PUM

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Abstract

The manufacture of seamless tubes in which the process includes providing an assembly having a metal tube blank (1), and an elongate metal core (2) of shape memory effect material which is surrounded and contacted by the tube blank (1) with a minimal gap. The assembly is elongated by mechanical working thereof at an elevated temperature until the tube blank (1) has been converted into a tube of desired dimensions. After the elongation step, the core (2) is subjected to a treatment which results in the core being in a stretched condition throughout its length, and does not substantially stretch the tube (1). The core is removed from the tube, and subsequently subjected to drawing passes over a nondeformable mandrel thereby refining the precision of diametric and wall dimensions with improved ID and OD surface quality. There is also decoring and reinserting to improve final dimensions which results in the ability to fabricate smaller, longer tubes.

Description

technical field [0001] This invention relates generally to metal tube technology, and more particularly to the manufacture of seamless, shape memory, metal tubes, especially those using nickel titanium or titanium alloys. Background technique [0002] Most metal tubes are made by machining a tube stock on a non-deformable mandrel and / or in combination with a cold drawing process in which the tube is drawn through a die with no internal support. This discontinuous process is slow and expensive, and only limited lengths of pipe can be produced. It is also known to produce seamless pipes of uniform cross-section by machining of an assembly of a core and a tube, thus elongating the core and tube and then removing the core. The core is removed in relation to the core material, by melting the core which has a melting point lower than the melting point of the tube, by selectively dissolving the core, or according to a prior invention by mechanically stretching the core to a reduce...

Claims

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Application Information

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IPC IPC(8): B21C45/00B21C1/22B21C1/00B21C1/24B21C1/32B21C3/16B21C9/00B21C23/00B21C37/06C22C14/00C22C19/03C22F1/00C22F1/10C22F1/18
CPCB21C1/003B21C37/06B21C45/00B21C3/16B21C1/32B21C23/002Y10T29/4981B21C1/24
Inventor N·维布P·泊恩塞特吴明雄S·卡陪恩特J·佩雷茨P·埃德勒
Owner 敏忆有限公司
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