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Machining method for magnesium alloy thin-walled pipe for degradable and absorbable support

A processing method and magnesium alloy technology, which is applied in the processing field of magnesium alloy thin-walled tubes for degradable absorbing stents, can solve the problems of difficult tube processing, low tube quality and low yield, and achieve excellent mechanical properties and smooth inner and outer surfaces , the effect of high dimensional accuracy

Active Publication Date: 2018-06-12
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a processing method for magnesium alloy thin-walled tubes for degradable absorbing stents, to solve the problems in the prior art that the processing of the tubes is difficult, the quality of the tubes and the yield are low, and the preparation method of the present invention Process can obtain high-quality, high-precision and low-cost pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A processing method for magnesium alloy thin-walled tubes for degradable absorbing stents, the process flow is: melting→casting→turning→hot extrusion→inner hole processing→hot extrusion→inner and outer surface grinding and polishing→annealing→drawing→annealing - Drawing is repeated several times → finished product. Specific steps are as follows:

[0031] Step 1: Magnesium alloy in a protective atmosphere (CO 2 +SF 6 ) obtained by smelting in a resistance furnace, take the magnesium alloy ingot prepared by smelting, heat it to 500°C in a protective atmosphere (high-purity argon) furnace and keep it warm for 60 minutes, and then use a horizontal extruder at 450°C Extrude it to a rod with a diameter of 30 mm; cut the rod into sections with a length of 250 mm, and machine an inner hole with a diameter of 5 mm on the rod to obtain a rough pipe.

[0032] In terms of mass percentage, the composition of magnesium alloy is:

[0033] Zn: 4.1; Y: 1.3; Nd: 0.9; Fe: 0.003; Ni: 0...

Embodiment 2

[0052] A processing method of a magnesium alloy thin-walled tube for a degradable absorbing stent, the specific steps are as follows:

[0053] Step 1: Magnesium alloy in a protective atmosphere (CO 2 +SF 6 ) obtained by smelting in a resistance furnace, take the magnesium alloy ingot prepared by smelting, heat it to 540°C in a protective atmosphere (high-purity argon) furnace and keep it warm for 35 minutes, and then use a horizontal extruder at 450°C Extrude it to a rod with a diameter of 30 mm; cut the rod into sections with a length of 300 mm, and machine an inner hole with a diameter of 5 mm on the rod to obtain a rough pipe.

[0054] In terms of mass percentage, the composition of magnesium alloy is:

[0055] Zn: 5.0; Y: 1.5; Nd: 1.4; Fe: 0.004; Ni: 0.003; Cu: 0.001;

[0056] Step 2: Heat the rough pipe billet to 420°C in a protective atmosphere (argon) and keep it warm for 28 minutes, extrude a pipe billet with an outer diameter of 10mm and an inner diameter of 5mm by...

Embodiment 3

[0076] A processing method for magnesium alloy thin-walled tubes for degradable absorbing stents, the process flow is: melting→casting→turning→hot extrusion→inner hole processing→hot extrusion→inner and outer surface grinding and polishing→annealing→drawing→annealing - Drawing is repeated several times → finished product. Specific steps are as follows:

[0077] Step 1: Magnesium alloy in a protective atmosphere (CO 2 +SF 6 ) obtained by smelting in a resistance furnace, take the magnesium alloy ingot prepared by smelting, heat it to 480°C in a protective atmosphere (high-purity argon) furnace and keep it for 50 minutes, and then use a horizontal extruder at 450°C Extrude it to a rod with a diameter of 30 mm; cut the rod into sections with a length of 200 mm, and machine an inner hole with a diameter of 5 mm on the rod to obtain a rough pipe.

[0078] In terms of mass percentage, the composition of magnesium alloy is:

[0079] Zn: 3.0-5.0; Y: 1.0-2.0; Nd: 0.5-1.5; Fe: ≤0.00...

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Abstract

The invention belongs to the technical field of biomaterials, and discloses a machining method for a magnesium alloy thin-walled pipe for a degradable and absorbable support. The technological processof the method comprises the steps of smelting, casting, extruding, extruding punching, boring and cleaning of the inner surface and the outer surface, annealing, drawing, repeated conduction of annealing and drawing and obtaining of finished products. In the whole repeated drawing process, the reducing deformation amount of the pipe needs to be controlled during each pass, and the matching relation between the reducing deformation amount and the wall reduction deformation amount is well adjusted at the same time. The pipe obtained through the process is high in precise, the inner surface andthe outer surface are smooth and clean, the mechanical performance is excellent, and the whole process is simple, good in controllability and high in economic benefits.

Description

technical field [0001] The invention belongs to the technical field of biomaterials, in particular to a processing method for a magnesium alloy thin-walled tube for a degradable absorbing bracket. Background technique [0002] In recent years, with the improvement of living standards, the fat content of the national diet has been increasing, which makes cardiovascular disease one of the main fatal diseases of the people in all countries. In this regard, atherosclerosis causes blood vessel narrowing or even blockage most common. According to the statistics of the World Health Organization, it is predicted that by 2020, the number of people who will be life-threatening due to cardiovascular disease in my country will reach 4 million every year, which shows how much this disease threatens people's health. The most effective treatment modality for this type of disease is percutaneous transluminal coronary angioplasty. This interventional therapy technology began in the 1970s, ...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 盛立远都贝宁赖琛奚廷斐
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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