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A method of processing cobalt-base alloy superfine thin-walled tubes for stents

A technology of cobalt-based alloys and processing methods, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of low pipe yield and difficult pipe processing, achieve excellent mechanical properties, ensure critical deformation, Economical effect

Active Publication Date: 2012-02-29
JIANGSU FENGYUAN MEDICAL DEVICES CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of processing method for cobalt-based alloy ultra-thin thin-walled tubing for coronary stents, to solve the problems in the prior art that the processing of the tubing is relatively difficult, and the yield of the tubing is low. The preparation process can obtain high-quality, high-precision and low-cost pipes

Method used

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Embodiment

[0023] The processing method of the cobalt-based alloy ultra-fine thin-walled tube for the bracket of the present invention, its technological process is: smeltingforging → hot rolling → hot rolling piercing → internal and external surface boring and grinding cleaning → annealing → cold rolling / drawing → annealing-cold rolling / drawing is repeated several times→finished product. Specific steps are as follows:

[0024] Step 1: The cobalt-based alloy is obtained by smelting in a vacuum induction furnace. Take the cobalt-based alloy ingot prepared by smelting, heat it to 1200°C in a protective atmosphere (argon) furnace, and then use a fast forging machine at 1180°C. Forged to a bar with a diameter of 50mm.

[0025] In this embodiment, by weight percentage, the cobalt-based alloy composition is:

[0026] C: 0.10; Cr: 20.0; Ni: 10.0; W: 15.0; Mn: 1.5; Fe: 1.0; Si: 0.20; P: 0.025;

[0027] Step 2: Reheat the hot-forged alloy bar to 1130° C. in a protective atmosphere (argon),...

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Abstract

The invention relates to a forming technology of superfine thin walled tubular products for vessel stents in the field of treatment, specifically to a method of processing cobalt-base alloy superfine thin walled tubes for novel coronary artery stents. The method solves the problems of great difficulty in tubular product processing and low yield of tubular products in a conventional technology. The method for forming finished products comprises the successive technological processes of smelting, forging, hot rolling, hot rolling punching, honing and cleaning of inner surfaces and outer surfaces, annealing, cold rolling / drawing, annealing, and repeated cold rolling / drawing. During overall process of the repeated cold rolling, diameter reducing deformation of the tubular products should be controlled in each pass, and match relationship between the diameter reducing deformation and wall reducing deformation should be well adjusted for guaranteeing that load carrying capability of inner walls does not exceed sigma b (breaking strength) and thus for preventing horizontal microscopic breakage. With rough blanks of the tubular products being acquired in high temperature conditions and the cobalt-base alloy tubular products being acquired through rolling at a room temperature, the processing method guarantees high dimensional precision, bright and clean inner and outer surfaces and excellent mechanical property of the tubular products; and is easy to realize and has high controllability and high economic benefit.

Description

technical field [0001] The invention relates to a forming process of an ultra-fine thin-walled pipe material for a blood vessel stent used in the field of interventional therapy, in particular to a processing method for a cobalt-based alloy ultra-fine thin-walled pipe used for a novel coronary stent. 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 per...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21B3/00B21B37/78
Inventor 盛立远奚廷斐杨柯张志雄张炳春赖琛刘勇杨慧宾
Owner JIANGSU FENGYUAN MEDICAL DEVICES CO LTD
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