Processing method of nickel-titanium memorial alloy tube with thin diameter and thick wall

A nickel-titanium memory alloy and processing method technology, applied in the field of material processing, can solve the problems of small inner diameter of pipe joints, preparation of thick-walled and thin-diameter nickel-titanium memory alloy tube billets, thick walls, etc., and achieve good memory recovery performance Effect

Active Publication Date: 2013-06-19
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nickel-titanium memory alloy pipe joints for small-diameter pipeline connections with an outer diameter of less than 4mm are also widely used in engineering applications. Thick-walled and thin-diameter nickel-titanium memory alloy tube blanks are currently mostly prepared by machining from rods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Firstly, a nickel-titanium memory alloy tube blank with an outer diameter of 16mm and an inner diameter of 8mm is produced by machining;

[0019] 2. The nickel-titanium memory alloy tube billet is processed to an outer diameter of 10 mm and an inner diameter of 5.5 mm through multi-pass rolling of a three-roll cold rolling mill. The rolling process parameters are: the processing rate of each pass is 10-15%, and every 2 passes Intermediate annealing at 600 degrees for one hour;

[0020] 3. Heat the nickel-titanium memory alloy cold-rolled pipe at 800 degrees for half an hour, and then carry out hot swaging with a pass processing amount of 10-15%, swaging to an inner diameter of 2mm, and an outer diameter of 7.5mm at this time;

[0021] 4. The nickel-titanium memory alloy pipe obtained by rotary forging is cold-drawn through four passes of 7.3mm, 7.0mm, 6.8mm and 6.55mm, and the deformation of each pass is 6%, 10%, 7%, and 5% respectively; Obtain a nickel-titanium mem...

Embodiment 2

[0024] 1. Firstly, the nickel-titanium memory alloy tube blank with an outer diameter of 30mm and an inner diameter of 15mm is obtained by extrusion;

[0025] 2. The nickel-titanium memory alloy tube billet is processed to an outer diameter of 14 mm and an inner diameter of 7 mm through multi-pass rolling of a three-roll cold rolling mill. The rolling process parameters are: the processing rate of each pass is 20-25%, and each 2 passes is 600 One hour intermediate annealing;

[0026] 3. Heat the nickel-titanium memory alloy cold-rolled pipe at 800 degrees for half an hour, and then perform hot swaging with a pass deformation of 25-30%, swaging to an inner diameter of 3.0mm, and an outer diameter of 10mm at this time;

[0027] 4. The nickel-titanium memory alloy pipe obtained by swaging is cold-drawn through three passes of 9.65mm, 9.3mm, and 9.1mm, and the deformations of the passes are: 8%, 8%, and 5% respectively; the inner diameter is 3mm, and the outer diameter is 3mm. Ni...

Embodiment 3

[0030] 1. Firstly, a nickel-titanium memory alloy tube blank with an outer diameter of 16mm and an inner diameter of 8mm is produced by machining;

[0031] 2. The nickel-titanium memory alloy tube billet is processed to an outer diameter of 9mm and an inner diameter of 4.5mm through multi-pass rolling of a three-roll cold rolling mill. The rolling process parameters are: the processing rate of each pass is 10-13%, and every 2 passes Intermediate annealing at 600 degrees for one hour;

[0032] 3. Heat the nickel-titanium memory alloy cold-rolled pipe at 800 degrees for half an hour, and then carry out hot swaging with a pass deformation of 8%, until the inner diameter is 3.1mm, and the outer diameter is 6mm at this time;

[0033] 4. The nickel-titanium memory alloy pipe obtained by rotary forging is cold-drawn through four passes of 5.7mm, 5.4mm, 5.2mm, and 5.05mm, and the deformations of each pass are: 13%, 14%, 11%, and 11%. ;A nickel-titanium memory alloy pipe with an inner...

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Abstract

The invention discloses a processing method of a nickel-titanium memorial alloy tube with a thin diameter and a thick wall and belongs to the field of material processing. The processing method of the nickel-titanium memorial alloy tube with thin diameter and thick wall includes: manufacturing a nickel-titanium memorial alloy tube blank according to actual use requirements and adopting a method of three-roller cold rolling to roll the inner diameter into 3 to 8 millimeters according to a gate working rate of 10% to 25%; and then enabling the inner diameter to nearly reach a final size by conducting rotary swaging, wherein rotary swaging is conducted at a working rate of not more than 30% of gate deformation; processing the outer diameter into a needed size on the premise of guaranteeing that the inner diameter reaches an appropriate size by drawing, wherein the gate deformation is 5% to 15%; and finally obtaining a finished product of the tube with the thick wall and the thin diameter by correcting and cylindrical grinding. According to the processing method of the nickel-titanium memorial alloy tube with thin diameter and thick wall, the nickel-titanium memorial alloy tube with the thin diameter of lower than 3 millimeters and the thick wall of 1millimeter to 3 millimeters can be manufactured. The nickel-titanium memorial alloy tube with the thin diameter and the thick wall has the advantages of possessing an appropriate organization and an axial structure and being particularly suitable for preparing the nickel-titanium memorial alloy thin diameter tube connector with high recoverability.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to the processing and preparation of nickel-titanium memory alloy thin-diameter thick-walled tubes. Background technique [0002] With the wide application of nickel-titanium memory alloy in engineering applications, the preparation and processing of nickel-titanium memory alloy materials has gradually become one of the bottlenecks restricting its engineering application. Among them, the more typical is the nitinol memory alloy pipe connection application pipe joint, engineering application needs, the pipe joint needs to have a certain wall thickness, and the final machining allowance also needs to be considered, so the nitinol memory alloy pipe used for the pipe joint is usually It has the characteristics of tube wall thickness. At present, nickel-titanium memory alloy pipe joints for small-diameter pipeline connections with an outer diameter of less than 4mm are als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D8/10C22F1/10
Inventor 尹向前米绪军李艳锋高宝东解浩峰
Owner GRIMAT ENG INST CO LTD
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