CN103231040A - Semisolid extrusion and thixomolding mould and method for degradable magnesium alloy micro cautery - Google Patents
Semisolid extrusion and thixomolding mould and method for degradable magnesium alloy micro cautery Download PDFInfo
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- CN103231040A CN103231040A CN2013101541255A CN201310154125A CN103231040A CN 103231040 A CN103231040 A CN 103231040A CN 2013101541255 A CN2013101541255 A CN 2013101541255A CN 201310154125 A CN201310154125 A CN 201310154125A CN 103231040 A CN103231040 A CN 103231040A
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Abstract
The invention discloses a semisolid extrusion and thixomolding mould and method for a degradable magnesium alloy micro cautery. The semisolid extrusion and thixomolding mould for the degradable magnesium alloy micro cautery is characterized in that a core bar and a core bar fixing plate are arranged between a punch and a matrix, the core bar is inserted into the core bar fixing plate, the bottom of the core bar extends into the matrix, the bottom of the punch is connected with the top of the core bar fixing plate, one side of the core bar fixing plate extends into the space of the middle portion of an extruding container, and the core bar fixing plate and the space of the middle portion of the extruding container form a ring-shaped space with a notch. The semisolid extrusion and thixomolding method for the degradable magnesium alloy micro cautery comprises firstly grinding magnesium alloy raw materials into powders, then placing the powders in the extruding container, heating the mould to enable the magnesium alloy materials to turn into semisolid blanks of solid-liquid coexistence, and pressing the punch downward on the semisolid blanks to enable the semisolid blanks to enter the matrix to being subjected to thixomolding to form the micro cautery. The magnesium alloy micro cautery formed through the semisolid extrusion and thixomolding mould and method for the degradable magnesium alloy micro cautery is accurate in structure and high in forming efficiency and can be well applied to medical permanent implantation stents.
Description
Technical field
The present invention relates to the field shaping technique of medical metal material, particularly a kind of semisolid of degradable magnesium alloy microcapillary extruding thixotroping mould and method.
Background technology
Be one of the most frequently used treatment means of vascular diseases (narrow, thrombus, patch etc.) through the conduit PCI, especially percutaneous puncture transluminal coronary angioplasty is the very effective methods for the treatment of of coronary atherosclerosis disease.The metallic support of present clinical use (316L, NiTi alloy etc.) is permanent implanted, and patient need take the anti-freezing anti-inflammatory drug for a long time; And the poor mechanical property of polymer support is easy to generate harmful materials such as heat, monomer, little molecule during degraded.Studies show that the degradable magnesium alloy support has better biocompatibility, and magnesium is human essential elements, in regular hour scope endosome, can be absorbed after the degraded, but its manufacture difficulty is big, and this material generally uses at present, and its manufacturing process and manufacturing installation also remain to be developed.Magnesium alloy bracket also can be used for other positions of human body except being applied to vascular diseases, is used for guaranteeing the unobstructed of various pipelines, as urethra, bile duct, esophagus etc., so the development magnesium alloy blood vessel rack has great importance.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the semisolid extruding thixotroping mould of the degradable magnesium alloy microcapillary that a kind of moulding process is simple, end product quality is higher is provided.
Another object of the present invention is to provide a kind of semisolid extruding thixotroping forming method of the degradable magnesium alloy microcapillary of realizing by above-mentioned mould.
Technical scheme of the present invention is: a kind of semisolid extruding thixotroping mould of degradable magnesium alloy microcapillary, comprise the punch and the die that match, die is fixed in the recipient bottom, punch is located at recipient top, also be provided with core bar and core bar fixed head between punch and the die, core bar is embedded in the core bar fixed head, the core bar bottom is stretched in the die, the punch bottom joins with core bar fixed head top, core bar fixed head one side stretches into the space at recipient middle part, and the space at core bar fixed head and recipient middle part forms notched annular space.
Described die comprises left die and right die, forms the ampuliform space between left die and the right die, and core bar stretches to the neck below in ampuliform space, leaves the gap between core bar and left die and the right die, and the width in gap is 0.1～0.5mm.The width in gap is determined by the wall thickness of required microcapillary between left side die, right die and the core bar, and in the extruding thixotroping forming process, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then begins to cool down semi-solid blank earlier.
Ampuliform space in the described die is communicated with the space at recipient middle part.
Described left die and right die top are respectively equipped with boss, and the boss top has fillet, and the boss bottom has chamfering, form the neck in ampuliform space between the boss of left die and the boss of right die.The setting of fillet can make things convenient for the gap between the more uniform inflow core bar of semi-solid blank and left die, the right die on the boss, makes the microcapillary wall thickness after the moulding even.
The space at described recipient middle part comprises cylindrical space and the annular space that is connected, and cylindrical space is the punch activity space that is positioned at core bar fixed head top, and annular space is the blank flowing space that is positioned at core bar fixed head one side.
Fixedly connected with upper bolster by punch retainer in described punch top, die and recipient are fixed on the die shoe, and upper bolster flexibly connects by guide pillar and die shoe; Die is fixed in the recipient by the die lining.
Described recipient joins by recipient lining and die shoe, and recipient is fixedlyed connected with die shoe by cushion block with the recipient sleeve.
The present invention can realize may further comprise the steps a kind of semisolid extruding thixotroping forming method of degradable magnesium alloy microcapillary by above-mentioned mould:
(1) raw material magnesium alloy is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder is put into recipient, and regulate the parameter of press device;
(4) heating mould in vacuum environment or inert protective gas environment, the heating rate of mould is 10～60 ℃/min, is incubated then to the semi-solid blank of solid-liquid two-phase coexistent, the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
In the described step (5), after the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
In the described step (1), raw material magnesium alloy is the mixture with a series of different trade mark magnesium alloy materials.
Utilize the magnesium alloy microcapillary of above-mentioned mould and method moulding, its internal diameter is generally 1.5～5mm, and wall thickness is generally 0.1～0.5mm.
The present invention has following beneficial effect with respect to prior art:
Semisolid extruding thixotroping mould and the method for this degradable magnesium alloy microcapillary, it mainly is first killer---the cardiovascular and cerebrovascular disease at the dead cause of disease of the present mankind, solve and adopt medical stainless steel clinically, titanium alloy, the ubiquitous non-degradable problem of timbering materials such as cochrome, utilizing the perishable degradation characteristic of magnesium is the characteristics of indispensable trace element in the human body with it, its special-purpose mould and method is provided, utilize the plastic magnesium alloy ultra-fine thin-wall tube of this mould and method, its principle is simple, technology easily realizes, the quality of finished product is also higher, can be widely used in the use of permanent implanted support.
Each building block of the semisolid of this degradable magnesium alloy microcapillary extruding thixotroping mould all adopts hot die steel, and its thermal deformation is little, have certain red hardness.In addition, each building block is after Overheating Treatment, pass through grinding again, the working surface of vital parts such as punch, die and core bar is slightly released souls from purgatory and is reached 0.05, require the form and position tolerance of guide elements and mating parts to reach below 6 grades of the grades of tolerance (comprising 6 grades) simultaneously, its precision height, moulding magnesium alloy microcapillary more accurately.
Description of drawings
Fig. 1 is the structural representation of the semisolid extruding thixotroping mould of this degradable magnesium alloy microcapillary.
Fig. 2 is that the A of Fig. 1 is to view.
Fig. 3 is the overall structure schematic diagram after the semisolid extruding thixotroping mould of degradable magnesium alloy microcapillary is assemblied on the shaped device.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
The semisolid extruding thixotroping mould of a kind of degradable magnesium alloy microcapillary of present embodiment, as shown in Figure 3, comprise the punch 1 and the die 2 that match, die is fixed in recipient 3 bottoms, punch is located at recipient top, as shown in Figure 2, also be provided with core bar 4 and core bar fixed head 5 between punch and the die, core bar is embedded in the core bar fixed head, the core bar bottom is stretched in the die, and the punch bottom joins with core bar fixed head top, and core bar fixed head one side stretches into the space at recipient middle part, as shown in Figure 3, the space at core bar fixed head and recipient middle part forms notched annular space.
As shown in Figure 2, die comprises left die 2-1 and right die 2-2, forms the ampuliform space between left die and the right die, and core bar stretches to the neck below in ampuliform space, leaves the gap between core bar and left die and the right die, and the width in gap is 0.1～0.5mm.The width in gap is determined by the wall thickness of required microcapillary between left side die, right die and the core bar, and in the extruding thixotroping forming process, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then begins to cool down semi-solid blank earlier.
Ampuliform space in the die is communicated with the space at recipient middle part.
Left side die and right die top are respectively equipped with boss, and the boss top has fillet, and the boss bottom has chamfering, form the neck in ampuliform space between the boss of left die and the boss of right die.The setting of fillet can make things convenient for the gap between the more uniform inflow core bar of semi-solid blank and left die, the right die on the boss, makes the microcapillary wall thickness after the moulding even.
The space at recipient middle part comprises cylindrical space and the annular space that is connected, and cylindrical space is the punch activity space that is positioned at core bar fixed head top, and annular space is the blank flowing space that is positioned at core bar fixed head one side.
As shown in Figure 3, fixedly connected with upper bolster 7 by punch retainer 6 in punch 1 top, and die 2 and recipient 3 are fixed on the die shoe 8, and upper bolster flexibly connects by guide pillar 9 and die shoe; Die is fixed in the recipient by die lining (see figure 2).
Embodiment 2
It is that 1.5mm, thickness are the degradable magnesium alloy microcapillary of 0.1mm that present embodiment prepares internal diameter by embodiment 1 described mould, and its forming method may further comprise the steps:
(1) magnesium alloy materials of ZK60 (40%)+WE43(60%) is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder being put into recipient, and regulate the parameter of press device, is 80～100KN as pressure, and speed is automatic, and temperature is 580～650 ℃;
(4) heating mould in vacuum hotpressing stove, the heating rate of mould is 30～60 ℃/min, and heating 6min is incubated 25～40min then, this moment, magnesium alloy materials was the semi-solid blank of solid-liquid two-phase coexistent, and the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
After the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
It is that 2.0mm, thickness are the degradable magnesium alloy microcapillary of 0.1mm that present embodiment prepares internal diameter by embodiment 1 described mould, and its forming method may further comprise the steps:
(1) magnesium alloy materials of MB1 (40%)+MB15(60%) is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder being put into recipient, and regulate the parameter of press device, is 100～120KN as pressure, and speed is automatic, 500～550 ℃ of temperature;
(4) heating mould in vacuum hotpressing stove, the heating rate of mould is 20～50 ℃/min, heating 8min, insulation 15～30min, this moment, magnesium alloy materials was the semi-solid blank of solid-liquid two-phase coexistent, and the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
After the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
It is that 3.0mm, thickness are the degradable magnesium alloy microcapillary of 0.1mm that present embodiment prepares internal diameter by embodiment 1 described mould, and its forming method may further comprise the steps:
(1) magnesium alloy materials of AZ31 (40%)+AZ91(60%) is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder being put into recipient, and regulate the parameter of press device, is that 70～95KN, speed are automatic as pressure, and temperature is 450～550 ℃;
(4) heating mould in vacuum hotpressing stove, the heating rate of mould is 10～30 ℃/min, heating 15～20min, insulation 25～40min, this moment, magnesium alloy materials was the semi-solid blank of solid-liquid two-phase coexistent, and the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
After the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
It is that 4.0mm, thickness are the degradable magnesium alloy microcapillary of 0.1mm that present embodiment prepares internal diameter by embodiment 1 described mould, and its forming method may further comprise the steps:
(1) magnesium alloy materials of AZ80A (40%)+WE43(60%) is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder being put into recipient, and regulate the parameter of press device, is 120～150KN as pressure, and speed is automatic, and temperature is 600～650 ℃;
(4) heating mould in vacuum hotpressing stove, the heating rate of mould is 30～50 ℃/min, heating 13～15min, insulation 25～50min, this moment, magnesium alloy materials was the semi-solid blank of solid-liquid two-phase coexistent, and the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
After the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
Embodiment 6
It is that 5.0mm, thickness are the degradable magnesium alloy microcapillary of 0.1mm that present embodiment prepares internal diameter by embodiment 1 described mould, and its forming method may further comprise the steps:
(1) magnesium alloy materials of ZK60 (30%)+WE43(50%)+MB1 (20%) is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder being put into recipient, and regulate the parameter of press device, is 150～200KN as pressure, and speed is automatic, and temperature is 500～580 ℃;
(4) heating mould in vacuum hotpressing stove, the heating rate of mould is 30～60 ℃/min, heating 10～12min, insulation 25～40min, this moment, magnesium alloy materials was the semi-solid blank of solid-liquid two-phase coexistent, and the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary; Punch is active in the cylindrical space in the recipient, and the extruding semi-solid blank makes it enter annular space, enters die again; After semi-solid blank entered die, in the neck moulding in ampuliform space, the bottom that falls into the ampuliform space then began to cool down earlier.
After the microcapillary moulding, place alkaline solution to soak microcapillary, carry out anti-oxidation processing.
After machining, the side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head in the mould are positioned at recipient are cleared up, so that microcapillary moulding is next time used.
As mentioned above, just can realize the present invention preferably, above-described embodiment is preferred embodiment of the present invention only, is not to limit practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.
Claims (10)
1. the semisolid of degradable magnesium alloy microcapillary is pushed the thixotroping mould, comprise the punch and the die that match, it is characterized in that, die is fixed in the recipient bottom, punch is located at recipient top, also be provided with core bar and core bar fixed head between punch and the die, core bar is embedded in the core bar fixed head, the core bar bottom is stretched in the die, the punch bottom joins with core bar fixed head top, core bar fixed head one side stretches into the space at recipient middle part, and the space at core bar fixed head and recipient middle part forms notched annular space.
2. push the thixotroping mould according to the semisolid of the described degradable magnesium alloy microcapillary of claim 1, it is characterized in that, described die comprises left die and right die, form the ampuliform space between left side die and the right die, core bar stretches to the neck below in ampuliform space, leave the gap between core bar and left die and the right die, the width in gap is 0.1～0.5mm.
3. according to the semisolid extruding thixotroping mould of the described degradable magnesium alloy microcapillary of claim 2, it is characterized in that the ampuliform space in the described die is communicated with the space at recipient middle part.
4. push the thixotroping mould according to the semisolid of the described degradable magnesium alloy microcapillary of claim 2, it is characterized in that, described left die and right die top are respectively equipped with boss, the boss top has fillet, the boss bottom has chamfering, forms the neck in ampuliform space between the boss of left die and the boss of right die.
5. push the thixotroping mould according to the semisolid of the described degradable magnesium alloy microcapillary of claim 1; it is characterized in that; the space at described recipient middle part comprises cylindrical space and the annular space that is connected; cylindrical space is the punch activity space that is positioned at core bar fixed head top, and annular space is the blank flowing space that is positioned at core bar fixed head one side.
6. push the thixotroping mould according to the semisolid of the described degradable magnesium alloy microcapillary of claim 1, it is characterized in that, fixedly connected with upper bolster by punch retainer in described punch top, die and recipient are fixed on the die shoe, and upper bolster flexibly connects by guide pillar and die shoe; Die is fixed in the recipient by the die lining.
7. according to the semisolid extruding thixotroping mould of the described degradable magnesium alloy microcapillary of claim 6, it is characterized in that described recipient joins by recipient lining and die shoe, recipient is fixedlyed connected with die shoe by cushion block with the recipient sleeve.
8. realize a kind of semisolid extruding thixotroping forming method of degradable magnesium alloy microcapillary according to the described mould of claim 1～7, it is characterized in that, may further comprise the steps:
(1) raw material magnesium alloy is made powder by ball milling, powder size is 0.01～0.1mm, adds the argon gas as inert protective gas in mechanical milling process, prevents the powder oxidation;
(2) will evenly be coated on side and the core bar outer surface that recipient inner surface, die inner surface, punch outer surface, core bar fixed head are positioned at recipient as the graphite of lubricant;
(3) powder is put into recipient, and regulate the parameter of press device;
(4) heating mould in vacuum environment or inert protective gas environment, the heating rate of mould is 10～60 ℃/min, is incubated then to the semi-solid blank of solid-liquid two-phase coexistent, the shared percentage by volume of liquid is 40～60% in the semi-solid blank;
(5) punch descends in recipient, acts on the semi-solid blank with the extrusion speed of 5～60mm/min, and semi-solid blank enters in the die from the annular space of recipient bottom, and thixotroping is shaped to microcapillary.
9. the semisolid of described degraded magnesium alloy microcapillary is pushed the thixotroping forming method according to Claim 8, it is characterized in that, in the described step (5), after the microcapillary moulding, places alkaline solution to soak microcapillary, carries out anti-oxidation processing.
10. the semisolid of described degraded magnesium alloy microcapillary is pushed the thixotroping forming method according to Claim 8, it is characterized in that in the described step (1), raw material magnesium alloy is the mixture with a series of different trade mark magnesium alloy materials.
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| CN201310154125.5A CN103231040B (en) | 2013-04-27 | 2013-04-27 | The micro cautery of degradable magnesium alloy microcapillary and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114951658A (en) * | 2022-06-16 | 2022-08-30 | 浙江勇腾科技有限公司 | Powder metallurgy ball-type bearing extrusion forming die |
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| US3159482A (en) * | 1960-03-11 | 1964-12-01 | Eudier Michel | Method of manufacturing a sintered metal tube |
| CN101396724A (en) * | 2007-09-27 | 2009-04-01 | 北京有色金属研究总院 | Semi-solid shaping die and use method thereof |
| CN101549361A (en) * | 2009-05-08 | 2009-10-07 | 重庆大学 | Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold |
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| CN103231040B (en) | 2015-09-09 |
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