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Hot processing method for medical cobalt-based alloy small and tiny tubular products

A cobalt-based alloy and thermal processing technology, which is applied in the direction of metal processing equipment, can solve the problems of difficult processing and high strength of cobalt-based alloys, and achieve the effects of high geometric dimension accuracy, good surface quality, and improved mechanical properties

Active Publication Date: 2020-02-04
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts a composite process of hot swaging combined with warm drawing, and by reasonably controlling the deformation and temperature parameters of each pass, a cobalt-based alloy micro-pipe with good surface quality, high geometric dimension accuracy, and excellent mechanical properties is obtained, which effectively solves the problem. Cobalt-based alloys have high strength and are difficult to process. The prepared cobalt-based alloy small micro-tubes have an outer diameter of 1mm to 3.0mm and a wall thickness of 0.1mm to 0.3mm, which is suitable for medical stent materials

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, tube blank preparation: the cobalt-based alloy tube blank with the nominal composition of Co-35Ni-20Cr-10Mo (MP35N) and the size of 25mm×3.0mm (outer diameter×wall thickness) prepared by mechanical drilling method is placed in In the tubular annealing furnace, heat preservation at 1250° C. for 45 minutes for solution treatment and quick cooling with argon filling; the length of the mechanically drilled tube used in the mechanical drilling method is 800 mm, and the spindle speed of the gun drill used is 2000 n / min, the feed amount is 58mm / min, and the cooling pressure is 45kg / cm 2 ;

[0028]Step 2. Hot swaging: adjust the coil width of the induction coil heating device to 150mm, and the heating temperature is 600°C. To heat the solution-treated MP35N cobalt-based alloy tube blank in step 1, use 2mm / s MP35N cobalt-based alloy Tube billet feeding speed is carried out hot swaging, obtains MP35N cobalt-based a...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] Step 1, tube blank preparation: Cobalt-based alloy with a nominal composition of Co-20Cr-15Ni-15Fe-7Mo-2Mn (Elgiloy) and a size of 20mm×1.5mm (outer diameter×wall thickness) prepared by mechanical drilling method The tube billet is placed in a tubular annealing furnace and kept at 1150°C for 30 minutes for solid solution treatment and filled with argon for quick cooling; the length of the mechanically drilled tube used in the mechanical drilling method is 600 mm, and the gun drill used The spindle speed is 2650n / min, the feed rate is 38mm / min, and the cooling pressure is 31kg / cm 2 ;

[0035] Step 2. Hot swaging: adjust the coil width of the induction coil heating device to 120mm, and the heating temperature is 490°C. To heat the solid solution treated Elgiloy cobalt-based alloy tube blank in step 1, use 5mm / s Elgiloy cobalt-based alloy Tube blank feed rate is carried out hot swaging, obtains Elgiloy cobalt-based a...

Embodiment 3

[0040] This embodiment includes the following steps:

[0041] Step 1. Tube blank preparation: the nominal composition prepared by mechanical drilling method is Co-20Ni-20Cr-5Fe-3.5Mo-3.5W-2Ti (Syncoben), and the size is 15mm×1.0mm (outer diameter×wall thickness) The cobalt-based alloy tube billet is placed in a tubular annealing furnace and held at 1050°C for 15 minutes for solution treatment and rapid water cooling; the length of the mechanically drilled tube used in the mechanical drilling method is 400 mm, and the gun used The spindle speed of the drill is 3000n / min, the feed rate is 24mm / min, and the cooling pressure is 25kg / cm 2 ;

[0042] Step 2, hot swaging: adjust the coil width of the induction coil heating device to 50mm, and the heating temperature is 400°C, and heat the Syncoben cobalt-based alloy tube blank that has been solution-treated in step 1, using 10mm / s Syncoben cobalt-based alloy Tube billet feeding speed is carried out hot swaging, obtains Syncoben cob...

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Abstract

The invention discloses a hot processing method for medical cobalt-based alloy small and tiny tubular products. The method includes the steps that firstly, cobalt-based alloy pipe blanks are subjectedto solution treatment and cooled; secondly, the cobalt-based alloy pipe blanks subjected to solution treatment are subjected to hot rotary swaging after being heated; thirdly, warm drawing and straightening are conducted on cobalt-based alloy tubular product intermediate products; and fourthly, the straightened cobalt-based alloy tubular product intermediate products are strengthened and subjected to oil removal and acid pickling after being cooled, and the cobalt-based alloy small and tiny tubular products are obtained. According to the hot processing method, the hot rotary swaging and warmdrawing combined composite process is adopted; and by reasonably controlling the deformation amount and temperature parameters of each pass, the cobalt-based alloy small and tiny tubular products goodin surface quality, high in geometric size precision and excellent in mechanical property are obtained, the problems that the cobalt-based alloy strength is high and processing is difficult are effectively solved, and the manufactured cobalt-based alloy small and tiny tubular products are suitable for medical stent materials.

Description

technical field [0001] The invention belongs to the technical field of processing cobalt-based alloy materials, and in particular relates to a thermal processing method for medical cobalt-based alloy small and micro pipes. Background technique [0002] Since the advent of intravascular stent implantation, the research and development of various new high-quality stents and their preparation technology has become the direction of scientific and technological workers. At present, the mature and widely accepted materials for making stents in the world are mainly medical stainless steel, titanium-nickel (Ti-Ni) shape memory alloy, Co-Cr alloy, etc. Compared with other material stents, Co-Cr alloy stents have higher strength. The stent prepared by laser cutting on the Co-Cr alloy can reduce the width of the strut and the volume of the whole stent without reducing the radial support strength and ray visibility (the diameter is reduced by about 30%, and the thinnest connecting rib ...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21J5/00B21C1/22C22F1/10
CPCB21C1/22B21C37/06B21J5/002C22F1/10
Inventor 刘汉源余森张亚峰荆磊程军何卫敏
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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