A kind of short process preparation method of magnesium or magnesium alloy capillary

A magnesium alloy and capillary technology, which is applied in the field of metal material processing, can solve the problems that limit the rapid development and popularization of medical magnesium or magnesium alloy capillary, the poor uniformity of capillary performance, and the poor uniformity of ingot composition, so as to prevent metal shavings and other Foreign matter adheres to the surface of the pipe, saves the intermediate annealing process, and ensures the quality of the inner surface

Active Publication Date: 2015-11-18
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above capillary production methods have the advantages of relatively mature production technology and relatively stable product quality, but the process is complicated, the process is long, the energy consumption is large, the production efficiency is low, and the production cost is high; the composition uniformity of the ingot is poor, and the capillary prepared by the same ingot The performance uniformity is poor; the surface of the material is easy to oxidize during and after processing, and the surface quality is poor; the material waste is serious and the yield is low; the unevenness of the metal flow during multiple empty drawing is likely to cause cracks on the inner surface of the capillary. Wrinkles and uneven wall thickness, which affect the surface quality of magnesium or magnesium alloy capillaries
The above problems have greatly limited the rapid development and application of medical magnesium or magnesium alloy capillaries.

Method used

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preparation example Construction

[0015] The short process preparation method of magnesium or magnesium alloy capillary described in the present invention comprises the following steps:

[0016] A. Melt magnesium or magnesium alloy at 700-850°C, and use the down-draw method to prepare a blank with an outer diameter of 5.0-10.0mm and a wall thickness of 1.0-2.0mm on a continuous directional solidification equipment at a casting speed of 30-50mm / min. Magnesium or magnesium alloy pipes with bright inner and outer surfaces, continuous columnar grain structure, and excellent cold workability.

[0017] B. Without any surface treatment, the magnesium or magnesium alloy pipe is directly drawn for multiple passes. During the drawing process, no intermediate annealing or only a small amount of low-temperature annealing is required, and the drawing process is first carried out 1 to 15 times. The cored drawing is followed by 1 to 15 times of empty drawing. The processing rate of the drawing passes of the cored drawing and...

Embodiment 1

[0019] Embodiment 1: the preparation method of the pure magnesium capillary that size is f3.0 * 0.5mm

[0020] Magnesium with a purity of 99.99% is melted at 850°C, and the pure magnesium alloy with f10.0×2.0mm bright internal and external surfaces and continuous columnar crystal structure is prepared by the down-draw method on continuous directional solidification equipment at a casting speed of 30mm / min. Magnesium tubing: the small-diameter thin-walled pure magnesium tubing with a bright surface is directly drawn with a core head, and drawn into a tube of f4.0×0.35mm after 10 passes, and then drawn into a f3.0×0.5 through 3 passes mm of pure magnesium capillary. Wherein, the elongation coefficient of the drawing pass is between 1.2 and 1.5, and the lubricant is vegetable oil.

Embodiment 2

[0021] Embodiment 2: the preparation method of the pure magnesium capillary that size is f2.0 * 0.35mm

[0022] Magnesium with a purity of 99.99% is melted at 750°C, and pure magnesium with f7.5×1.0mm bright inner and outer surfaces and continuous columnar crystal structure is prepared by the down-draw method at a casting speed of 40mm / min on continuous directional solidification equipment Pipe material: The small-diameter thin-walled pure magnesium pipe with bright surface is directly drawn with a core head, and drawn into a pipe of f4.0×0.35mm after 10 passes, and then drawn into a f2.0×0.35mm pipe after 3 passes of empty drawing pure magnesium capillary. Wherein, the elongation coefficient of the drawing pass is between 1.2 and 1.5, and the lubricant is vegetable oil.

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Abstract

The invention discloses a short-process preparation method of a magnesium or magnesium alloy capillary. The method comprises the steps that: a small-diameter thin-walled magnesium or magnesium alloy tube with smooth inner and outer surfaces, continuous columnar grain structure, and excellent cold-processing performance is prepared with a continuous directional solidification technology; under a condition with no surface treatment, the magnesium or magnesium alloy tube is directly subjected to a subsequent drawing process, wherein no intermediate annealing or a small volume of intermediate annealing is needed during the drawing process, such that the magnesium or magnesium alloy capillary is prepared with a short process and with high efficiency. According to the invention, the small-diameter thin-walled magnesium or magnesium alloy tube prepared with the continuous directional solidification technology is directly subjected to the drawing process, such that the magnesium or magnesium alloy capillary is prepared; and no intermediate annealing or a small volume of intermediate annealing is needed during the drawing process. Therefore, the method provided by the invention has the advantages of short process flow, high production efficiency, and low cost. During the capillary drawing process, no process such as cutting, machining, and pickling is needed, such that capillary processing efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a short-flow preparation method of a magnesium or magnesium alloy capillary. Background technique [0002] Intravascular stents are one of the most effective methods for treating cardiovascular diseases and are widely used in human medicine and other fields. The metal capillary is the main component of the metal vascular stent and the key to determine the quality of the metal vascular stent. At present, the metal intravascular stent materials used mainly include metal capillaries such as stainless steel, cobalt alloy, and titanium alloy, but these metal capillaries exist permanently in the body, have certain thrombogenicity, still have high restenosis, and can cause damage to the blood vessel wall. Weakness and other problems greatly limit its application, thus forcing people to look for new alternative metal capillary materials. Studies have found that compar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C1/22
Inventor 甘春雷郑开宏戚文军
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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