Manufacturing method of cobalt/iron composite tube for coronary stent and auxiliary equipment

A technology of composite pipe material and manufacturing method, which is applied in the direction of metal rolling, etc., can solve the problems of stenosis and large size of lesion blood vessels, and achieve the effect of simple process, excellent mechanical properties, and smooth inner and outer surfaces

Active Publication Date: 2013-09-11
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of ultra-thin thin-walled cobalt/iron composite tubing for coronary stent processing method and corresponding auxiliary equipment, to solve the problem that the size of the existing stent tubin

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  • Manufacturing method of cobalt/iron composite tube for coronary stent and auxiliary equipment

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Embodiment

[0035] The processing method of the cobalt / iron composite pipe used in the bracket of the present invention, its technological process is: smelting → forging → hot rolling → hot rolling piercing → internal and external surface boring, washing and grinding → pipe blank assembly → initial cold rolling and compounding → annealing → cold rolling / drawing Pulling→annealing-cold rolling / drawing is repeated many times→finished product. Specific steps are as follows:

[0036]Step 1: Cobalt-based alloy and pure iron are obtained by smelting in a vacuum induction furnace. Take the cobalt-based alloy ingot and pure iron ingot prepared by smelting, heat them in a protective atmosphere (argon) furnace to 1200°C, and then heat them at 1180°C Next, use a fast forging machine to forge it to a bar with a diameter of 40mm. In the present invention, by weight percentage, the purity of pure iron is 99.99%, and the cobalt-based alloy composition is: C: 0.10; Cr: 20.0; Ni: 10.0; W: 15.0; Mn: 1.5; ...

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Abstract

The invention relates to a processing method of a novel cobalt/iron composite tube for a coronary stent and auxiliary equipment. The problem that the existing stent is thick in tube wall and capable of easily causing repeat narrow of focus blood vessel is solved. The process flow comprises the following steps of: smelting, forging, hot rolling, hot rolling piercing, boring and polishing inner surface and outer surface, assembling tube blank, primarily cold rolling and compounding, annealing, cold rolling/drawing, annealing, repeatedly cold rolling/drawing, and obtaining the finished product. In the repeated cold rolling process, the composite tube deformation is controlled at each time, and meanwhile, the matching relation of the reducing deformation and wall-reducing deformation is adjusted so that the stress of the composite interface is less than 0.2 Sigmab cobalt (breaking strength) to prevent the composite interface from cracking. The rough blank of the tube is obtained at high temperature, the cobalt/iron composite tube is obtained by rolling at room temperature, and the common tube rolling process is used for processing; the composite tube is high in size precision, excellent in dynamic performance, simple in process, good in controllability, and high in economic benefit.

Description

technical field [0001] The invention relates to a forming process of an ultra-fine thin-walled composite pipe used in the field of interventional therapy, in particular to a processing method for a thin-walled cobalt / iron composite pipe used in a novel coronary stent. It also relates to an auxiliary device dedicated to the method. 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 nation. 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 whose lives are in danger due to cardiovascular diseases in my country will reach 4 million each year, which shows how much this disease poses a threat to people's health. The most effective treatment modality for this ty...

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Application Information

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IPC IPC(8): B21C37/06B21B17/00
Inventor 盛立远奚廷斐张志雄赖琛
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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