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

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...

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