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Magnesium alloy microcapillary and preparation method thereof

A magnesium alloy and microtube technology, which is applied in medical science, surgery, etc., can solve the problems of immature plastic processing technology of magnesium alloy, inability to produce metal processing methods, small size of magnesium alloy microtube, etc., and achieve good surface quality and low cost. The effect of low and excellent mechanical properties

Inactive Publication Date: 2018-01-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the processing of magnesium alloy pipes, especially the processing of microtubes.
Magnesium alloys have a close-packed hexagonal structure, and there are few slip systems at room temperature, resulting in poor plasticity and difficult deformation processing. The plastic processing technology of magnesium alloys is not yet mature.
Magnesium alloy microtubes are relatively small in size, difficult to form, and cannot be produced by common metal processing methods

Method used

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  • Magnesium alloy microcapillary and preparation method thereof
  • Magnesium alloy microcapillary and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This implementation case is a method for preparing a magnesium alloy microtube, the method comprising the following steps:

[0025] (1) Apply lubricant to the inner wall of the extrusion cylinder, the extrusion die and the surface of the extrusion punch, put it in a resistance furnace and heat it to 400°C, put in Mg-4.15Zn-0.27Mn-0.21Ca magnesium alloy for extrusion The billet is kept warm for 5 minutes; the extrusion cylinder, extrusion die, and extrusion billet are taken out from the resistance furnace, installed, and extruded when the temperature drops to 360°C. The extrusion speed is 3mm / s, and the outer diameter is 8mm. , a tube blank with an inner diameter of 6mm;

[0026] (2) In a box-type furnace, under the condition of 250° C., the magnesium alloy tube blank is subjected to stress relief annealing for 30 minutes;

[0027] (3) The annealed tube blank is subjected to multi-pass air drawing, the drawing deformation of each pass is 1% to 28%, the drawing speed is ...

Embodiment 2

[0031] This implementation case is a method for preparing a magnesium alloy microtube, the method comprising the following steps:

[0032] (1) Apply lubricant to the inner wall of the extrusion cylinder, the extrusion die and the surface of the extrusion punch, put it in a resistance furnace and heat it to 400°C, put in Mg-3.95Zn-0.30Mn-0.18Ca magnesium alloy for extrusion The billet is kept warm for 5 minutes; the extrusion cylinder, extrusion die, and extrusion billet are taken out from the resistance furnace, installed, and extruded when the temperature drops to 380°C. The extrusion speed is 3mm / s, and the outer diameter is 8mm. , a tube blank with an inner diameter of 6mm;

[0033] (2) In a box furnace, under the condition of 300°C, the magnesium alloy tube blank is subjected to stress relief annealing for 30 minutes;

[0034] (3) The annealed tube blank is subjected to multi-pass air drawing, the drawing deformation of each pass is 1% to 28%, the drawing speed is 5 to 8m...

Embodiment 3

[0038] This implementation case is a method for preparing a magnesium alloy microtube, the method comprising the following steps:

[0039] (1) Apply lubricant to the inner wall of the extrusion cylinder, the extrusion die and the surface of the extrusion punch, put it in a resistance furnace and heat it to 400°C, put in Mg-4.04Zn-0.18Mn-0.18Ca magnesium alloy for extrusion The billet is kept warm for 5 minutes; the extrusion cylinder, extrusion die, and extrusion billet are taken out from the resistance furnace, installed, and extruded when the temperature drops to 360°C. The extrusion speed is 3mm / s, and the outer diameter is 8mm. , a tube blank with an inner diameter of 6mm;

[0040] (2) In a box-type furnace, under the condition of 250° C., the magnesium alloy tube blank is subjected to stress relief annealing for 30 minutes;

[0041] (3) The annealed tube blank is subjected to multi-pass air drawing, the drawing deformation of each pass is 1% to 28%, the drawing speed is ...

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Abstract

The invention discloses a magnesium alloy microcapillary and a preparation method thereof and belongs to the field of metal material precision machining. The method comprises the following steps that(1) a magnesium alloy blank is extruded to obtain a seamless extruded pipe blank; (2) the obtained seamless extruded pipe blank is subjected to stress relief annealing; and (3) the annealed seamless extruded pipe blank is subjected to multiple passes of drawing and intermediate annealing, and the magnesium alloy microcapillary is obtained. The magnesium alloy microcapillary prepared through the preparation method provided by the invention is good in surface quality, precise in size, uniform in wall thickness and excellent in mechanical property; the machining method is simple in process, low in cost, high in machining efficiency, and capable of performing large-scale production; and the magnesium alloy microcapillary can be used as a structural component to be applied to the fields of automobiles and electronics, and can also be used as a medical implant used for preparing an intravascular stent.

Description

technical field [0001] The invention belongs to the field of precision machining of metal materials, in particular to a magnesium alloy microtube and a preparation method thereof. Background technique [0002] Magnesium resources are abundant on the earth, and the content of magnesium in the earth's crust is 2.77%, second only to aluminum and iron. In recent years, with the continuous increase of magnesium production, people's research on magnesium alloys has become more and more in-depth. A series of breakthroughs have been made in the preparation and processing of magnesium alloys, which has continuously improved its performance and greatly expanded the application of magnesium alloys. . Magnesium alloys are the lightest metal materials currently in use. It has low density, high specific strength and specific stiffness, excellent damping performance, electrical and thermal conductivity and electromagnetic shielding performance. In addition, magnesium is an important ele...

Claims

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Application Information

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IPC IPC(8): B21C37/06A61L31/02A61L31/14
Inventor 杜文博付军健刘轲王朝辉李淑波杜宪
Owner BEIJING UNIV OF TECH
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