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Method for processing and preparing medical small-diameter thin-wall cobalt-chromium pipe

A technology of cobalt chromium and pipes, which is applied in the field of processing and preparation of medical thin-diameter and thin-walled cobalt chromium pipes. It can solve the problems of severe work hardening, difficult processing, and reprocessing of inner and outer surfaces in difficult processing methods, so as to achieve uniform structure and improve the surface. Quality, the effect of reducing work hardening phenomenon

Active Publication Date: 2019-12-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cobalt-chromium material belongs to high-temperature alloy, which is difficult to process and has serious work hardening. Generally, it is processed by combining cold and hot processing. However, vascular stents have higher requirements on the surface quality of the inner and outer circles of the pipe and the uniformity of wall thickness. , the high-temperature environment has a serious impact on the quality of the inner and outer surfaces of the pipe, and the pipe is a thin-diameter thin-walled pipe, so it is difficult to reprocess the inner and outer surfaces by other processing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] Step 1. Prepare a cylindrical cobalt-chromium alloy ingot with a diameter of 70 mm by vacuum induction melting method, and then carry out billet forging at a temperature of 1200° C. to obtain a cobalt-chromium alloy rod with a diameter of 30 mm;

[0028] Step 2, cutting the cobalt-chromium alloy bar material obtained in step 1 to a length of 300mm, then turning the outer circle to a diameter of 28mm, and then using a 20mm drill to drill the inner hole to obtain a cobalt-chromium alloy tube blank;

[0029] Step 3. Use an internal grinder to grind the inner circle of the cobalt-chromium alloy tube blank obtained in step 2 to 28mm×4mm (outer diameter×wall thickness), and then perform multi-pass cold swaging at a feed rate of 5mm / s ; The material of the core rod used in the multi-pass cold swaging is quenched W6Mo5Cr4V2 high-speed steel;

[0030]The specific process of the multi-pass cold swaging is: (1) processing the...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. Prepare a cylindrical cobalt-chromium alloy ingot with a diameter of 100 mm by vacuum induction melting, and then carry out billet forging at a temperature of 1050° C. to obtain a cobalt-chromium alloy rod with a diameter of 20 mm;

[0036] Step 2, cutting the cobalt-chromium alloy bar material obtained in step 1 to a length of 400mm, then turning the outer circle to a diameter of 18mm, and then using a 14mm drill to drill the inner hole to obtain a cobalt-chromium alloy tube blank;

[0037] Step 3. Use an internal grinder to grind the inner circle of the cobalt-chromium alloy tube blank obtained in step 2 to 18mm×2mm (outer diameter×wall thickness), and then perform multi-pass cold swaging at a feed rate of 8mm / s ;

[0038] The specific process of the multi-pass cold swaging is: (1) processing the cobalt-chromium alloy tube blank with a size of 18mm×2mm (outer diameter×wall thickness) to 16.5mm×1.75mm (out...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] Step 1. Prepare a cylindrical cobalt-chromium alloy ingot with a diameter of 60 mm by vacuum induction melting method, and then carry out billet forging at a temperature of 1000° C. to obtain a cobalt-chromium alloy rod with a diameter of 26 mm;

[0044] Step 2, cutting the cobalt-chromium alloy bar material obtained in step 1 to a length of 500mm, then turning the outer circle to a diameter of 22mm, and then using a 17mm drill to drill the inner hole to obtain a cobalt-chromium alloy tube blank;

[0045] Step 3. Use an internal grinder to grind the inner circle of the cobalt-chromium alloy tube blank obtained in step 2 to 24mm×3.5mm (outer diameter×wall thickness), and then perform multi-pass cold spinning at a feed rate of 4mm / s forging;

[0046] The specific process of the multi-pass cold swaging is: (1) processing the cobalt-chromium alloy tube blank with a size of 24mm×3.5mm (outer diameter×wall thickness) to ...

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Abstract

The invention discloses a method for processing and preparing a medical small-diameter thin-wall cobalt-chromium pipe. The method comprises the following steps: 1, preparing a cobalt-chromium alloy ingot by adopting a vacuum induction melting method, and carrying out cogging and forging so as to obtain a cobalt-chromium ingot bar; 2, after cutting off the cobalt-chromium alloy bar according to a fixed length, carrying out excircle turning and drill hole machining in sequence so as to obtain a cobalt-chromium pipe blank; 3, carrying out incircle grinding on the cobalt-chromium pipe blank, and then carrying out multi-pass cold rotary forging; and 4, carrying out multi-pass drawing on the cobalt-chromium pipe blank subjected to multi-pass cold rotary forging, so as to obtain the cobalt-chromium pipe. According to the method disclosed by the invention, the conventional rolling process is replaced by cold rotary forging, so that the processing plasticity of the cobalt-chromium alloy pipe blank can be improved, the processing hardening phenomenon can be reduced, and the processing and forming can be facilitated; then, the quantity of annealing passes during processing can be reduced andthe processing efficiency can be improved; meanwhile, the surface quality of the cobalt-chromium pipe can be improved, and then the size of the cobalt-chromium pipe can be further reduced; and accordingly, the small-diameter thin-wall cobalt-chromium pipe for medical purposes can be acquired.

Description

technical field [0001] The invention belongs to the technical field of processing and preparing medical metal pipes, and in particular relates to a method for processing and preparing medical thin-diameter and thin-walled cobalt-chromium pipes. Background technique [0002] Vascular stents are widely used medical devices in the treatment of cardiovascular diseases. With the improvement of people's living standards in our country and the intensification of the aging trend of the population, the rise of cardiovascular diseases in my country has been rapid and tends to be younger in recent years. According to the forecast of the World Health Organization, by 2020, the number of critically ill patients due to cardiovascular diseases in my country will reach 4 million. [0003] At present, the materials for vascular stents mainly include 316L medical stainless steel, cobalt-chromium alloy, titanium alloy, iron alloy, magnesium alloy and zinc alloy. Among them, iron alloy, magne...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 荆磊余森张亚峰刘汉源程军张静
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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