CN108637031B - mould for preparing high-performance magnesium alloy pipe - Google Patents

mould for preparing high-performance magnesium alloy pipe Download PDF

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Publication number
CN108637031B
CN108637031B CN201810630370.1A CN201810630370A CN108637031B CN 108637031 B CN108637031 B CN 108637031B CN 201810630370 A CN201810630370 A CN 201810630370A CN 108637031 B CN108637031 B CN 108637031B
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diameter
female die
area
extrusion
mandrel
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CN108637031A (en
Inventor
胡红军
英玉磊
秦西
张丁非
欧忠文
梁鹏程
洪兴
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Chongqing University of Technology
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Chongqing University of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies

Abstract

The invention provides a die for preparing a high-performance magnesium alloy pipe, wherein a punch is movably arranged, the punch is over against a charging barrel of an extrusion barrel, and the magnesium alloy material in the charging barrel is extruded after the punch moves downwards; a heating device is arranged on the extrusion cylinder for heating; the female die is matched with the extrusion cylinder, and an inner hole of the female die is opposite to the charging barrel; the extrusion cylinder and the female die are arranged on a base with an inner hole, the lower end of the mandrel is arranged on the supporting plate, the upper end of the mandrel extends into the inner hole of the female die and is matched with the inner hole of the female die, and an extrusion cavity is formed between the outer side surface of the mandrel and the inner wall surface of the inner hole of the female die. According to the invention, 4 processes of extrusion, continuous shearing-bending, pipe forming and shaping are simultaneously completed on the same die, so that the process is less, the waste is reduced, and the energy is saved; the extrusion and continuous shearing deformation can introduce large strain rate, promote the generation of the dynamic recrystallization of the superfine crystal magnesium alloy and better exert the plastic deformation capability of the superfine crystal magnesium alloy material; can produce the superfine crystal magnesium alloy thin-wall pipe material in batch.

Description

Mould for preparing high-performance magnesium alloy pipe
Technical Field
the invention relates to a mould for processing a metal material, in particular to a mould for preparing a high-performance magnesium alloy pipe.
Background
In industrial production, the pipe is extruded and formed mainly by a forming die in the production and processing process; the traditional light alloy plastic deformation process comprises a plurality of stages of ingot preparation, ingot treatment, blank heating, thermoplastic deformation and the like.
For manufacturing ultra-fine grain alloy (light alloy) pipes, particularly thin-walled and high-precision light alloy pipes, at present, extrusion molding is mainly adopted, but in the traditional extrusion production process, forward extrusion is generally adopted, ribbon-shaped tissues and strong basal plane textures along the extrusion direction of the pipes can be formed by the forward extrusion, the mechanical property of the magnesium alloy is seriously reduced, anisotropy of the mechanical property is caused, and the textures are not beneficial to secondary processing (such as internal high-pressure forming, angle bending, bending and the like) of thin pipes; the defects of shrinkage cavity, looseness and the like in the light alloy casting structure are easily caused, so that the processing precision of the pipe, particularly the thin pipe, is poor. In addition, the transverse section structure of the traditional extruded light alloy pipe is equiaxial grains, and the longitudinal section structure after extrusion is changed into slender grains, and is particularly obvious. Meanwhile, due to strict requirements on the toughness, the secondary forming performance and the dimensional precision of the thin-wall pipe, a shape control and controllability integrated plastic forming method is required to be adopted, so that the complete filling, uniform deformation and coordinated control of microstructure evolution in the forming process are realized, and the method is also a hot problem in the research of the current plastic forming field.
At present, the magnesium industry urgently needs to develop a batch of new high-performance magnesium alloy materials, an advanced low-cost low-energy-consumption original magnesium production technology and a complete set of technology for producing large-size ultrathin and complex parts, particularly, a set of mould which can simultaneously complete extrusion, continuous shearing-bending, pipe forming and shaping is lacked, and the requirements of the market and users cannot be met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a forming die for a hollow magnesium alloy section, and a magnesium alloy pipe preparation die for simultaneously completing extrusion-shearing-bending-shaping composite deformation.
in order to achieve the purpose, the invention provides the following technical scheme: the mould for preparing the high-performance magnesium alloy pipe is characterized in that: the extrusion die mainly comprises a punch, an extrusion container, a female die, a base, a mandrel and a supporting plate; the punch is movably arranged, is over against the charging barrel of the extrusion barrel, moves downwards and then enters the charging barrel to extrude the magnesium alloy material in the charging barrel; a heating device is arranged on the extrusion cylinder for heating; the female die is matched with the extrusion cylinder, and an inner hole of the female die is opposite to the charging barrel; the extrusion cylinder and the female die are arranged on a base with an inner hole, the lower end of the mandrel is arranged on the supporting plate, the upper end of the mandrel extends into the inner hole of the female die and is matched with the inner hole of the female die, and an extrusion cavity is formed between the outer side surface of the mandrel and the inner wall surface of the inner hole of the female die.
Further features are: the female die is arranged in a cavity at the lower part of the extrusion container and is coated by the extrusion container.
The extrusion cylinder is provided with a plurality of heating holes, heating rods which generate heat are inserted into the heating holes, and the extrusion cylinder and the magnesium alloy material are heated.
The central line of the mandrel is superposed with the central line of the inner hole of the female die to form equally spaced extrusion cavities.
The female die is provided with a heating hole, and a heating rod which generates heat is inserted for heating.
And the heating hole on the female die corresponds to the position of part of the heating hole on the extrusion container, and the heating rod extends into the heating hole on the female die from the heating hole on the extrusion container.
The section of the inner hole of the female die is firstly a section of reducing area d1 with a reduced inner diameter from top to bottom to form a conical structure; a section of sizing area d2 is arranged below the reducing area d1, and the inner diameter of the d2 area is unchanged; corresponding to the reducing region d1 and the sizing region d2, the diameter of the mandrel 5 is unchanged, a tapered cavity with gradually reduced width is formed between the mandrel 5 and the reducing region d1, and a circular cavity with unchanged width is formed between the mandrel 5 and the sizing region d 2; a diameter-expanding shearing area d3 with gradually enlarged inner diameter is arranged below the area d2, a diameter-reducing shearing area d4 with gradually reduced inner diameter is arranged below the diameter-expanding shearing area d3, and the diameter-expanding shearing area d3 is smoothly and transitionally connected with the diameter-reducing shearing area d 4; the diameter of the mandrel 5 is correspondingly and gradually increased corresponding to the diameter-expanding shearing area d 3; corresponding to the diameter-reducing shearing area d4, the diameter of the mandrel 5 is correspondingly gradually reduced, and the width of the formed annular cavity is unchanged; below the reducing shearing area d4, there is a section of vertical reshaping area d5 with constant inner diameter, the diameter of the mandrel 5 is constant corresponding to the vertical reshaping area d5, and a circular cavity with constant width is formed.
Regarding a diameter expanding shearing region d3 and a diameter reducing shearing region d4 which are smoothly connected with each other in an inner hole of the female die as a group, and adding one group or two or more than three groups of diameter expanding shearing regions d3 and diameter reducing shearing regions d4 below a group of diameter expanding shearing regions d3 and diameter reducing shearing regions d 4; the diameter of the mandrel is correspondingly and gradually increased corresponding to the diameter expanding and shearing area d 3; the diameter of the corresponding reducing shearing area d4 is correspondingly and gradually reduced, and the width of the formed annular cavity is unchanged; two, three or more than four extrusion cavities with arc smooth turning are formed between the female die and the mandrel.
Compared with the existing magnesium alloy processing die, the die for preparing the high-performance magnesium alloy pipe has the following beneficial effects:
1. 4 processes of extrusion, continuous shearing-bending, pipe forming and shaping are completed on the same die at the same time, compared with the pipe hot extrusion process, the process has fewer processes, the waste is reduced, and the energy is saved; in addition, large strain rate can be introduced by extrusion and continuous shear deformation, the generation of dynamic recrystallization of the superfine crystal magnesium alloy is promoted, the plastic deformation capability of the superfine crystal magnesium alloy material can be better exerted, cracks are avoided under the condition of large strain, and the defect of holes in the tissue is reduced or eliminated; the deformation degree and uniformity of the pipe can be controlled by regulating and controlling the continuous forming temperature and speed of the pipe and the structure of the die, so that the degree of grain refinement, the strength of basal plane texture and the pipe precision are controlled, and the superfine crystal magnesium alloy thin-wall (1-5mm) pipe can be produced in batches; the method has the advantages of high grain refining and forming efficiency, high efficiency and energy saving.
2. The die has simple structure and low production cost, and is matched with a vertical extruder for use; the pipe can be continuously and stably produced by extrusion molding of the die, the production process is simplified, the production period is shortened, the time for preparing and producing the superfine crystal magnesium alloy material is short, the forming speed is high, the production efficiency is greatly improved, and the automation is conveniently realized by automatic control; and the method has great potential in improving the mechanical property and the forming capability of the superfine crystal magnesium alloy, can realize the continuous production of large-size superfine crystal magnesium alloy pipes, is suitable for preparing magnesium alloy pipes with poor plasticity, and has wide application range.
3. the superfine crystal magnesium alloy pipe produced by the device has good plasticity; through optimization of process and mold structural parameters, defects such as microscopic holes in the superfine crystal magnesium alloy can be eliminated, compactness of the material is improved, dendritic crystals are crushed, fine isometric crystals are formed, and texture of a basal plane is weakened, so that forming precision and mechanical property of the pipe are ensured, microstructure texture can be regulated and controlled by adjusting shearing frequency and shearing strength, reliability and controllability of the pipe are improved, and the method can be applied to processing and forming of superfine crystal magnesium alloy pipes such as magnesium aluminum titanium and the like.
4. Compared with other methods for refining large strain grains, the method has greater practicability and can be directly installed on a large extruder for extrusion.
5. compared with the common extrusion, the method increases the shearing stage, the bending stage and the shaping stage, can improve the uniformity of metal flow, and furthest improves the smoothness of the surface of the material.
6. The preparation and production of the magnesium alloy material have short time, high forming speed, continuous production and high productivity. Wide application range and simple operation.
7. The magnesium alloy material produced by the device has good plasticity, the provided preparation process is simple, the product cost is obviously reduced, and the device has the characteristics of environmental friendliness and wide application prospect.
Drawings
FIG. 1 is a front view of a mold structure according to the present invention;
FIG. 2 is a cross-sectional view taken along line a-a of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a sectional view of the structure of the second embodiment;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 shows the longitudinal structure of the embodiment through the reduced diameter section;
FIG. 7 shows longitudinal tissue after one cut of the embodiment;
FIG. 8 shows longitudinal tissue after one cut and one bend according to an embodiment;
FIG. 9 shows the longitudinal structure of the plastic tubing of the example.
In the figure: 1-punch, 2-extrusion cylinder, 3-die, 4-base, 5-mandrel, 6-supporting plate, 7-charging barrel, 8-heating hole, 9-observation hole and 10-magnesium alloy material.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, 2 and 3, the invention provides a die for preparing a high-performance magnesium alloy pipe, which mainly comprises a punch 1, an extrusion cylinder 2, a female die 3, a base 4, a mandrel 5, a supporting plate 6 and the like, wherein the punch 1 is movably arranged and driven by an extrusion device (an extruder) to move up and down, the punch 1 is over against a charging barrel 7 of the extrusion cylinder 2, moves down and then enters the charging barrel 7 to extrude a magnesium alloy material 10 in the charging barrel 7; the extrusion cylinder 2 is provided with a heating device for heating, specifically, a plurality of heating holes 8 are arranged, heating rods which generate heat are inserted into the heating holes 8 to heat the extrusion cylinder and the magnesium alloy material 10, and the temperature and the heating uniformity which meet the process requirements are achieved; the female die 3 is matched with the extrusion cylinder 2, and an inner hole of the female die 3 is opposite to the charging barrel 7 to form a moving channel of the magnesium alloy material during extrusion; the female die 3 is specifically arranged in a cavity at the lower part of the extrusion container 2 and is coated in the extrusion container 2. The extrusion container 2, the die 3 sets up on the base 4 that has the hole, 5 lower extremes of dabber set up in backup pad 6, the hole of die 3 is stretched into to the upper end, with the hole cooperation of die 3, between the internal face of the lateral surface of dabber 5 and 3 holes of die, form the extrusion die cavity, during concrete installation, the central line of dabber 5 and the coincidence of the central line of 3 holes of die, the clearance between the internal face of the lateral surface of dabber 5 and 3 holes of die is even, form equidistant, even extrusion die cavity. As required, an observation hole 9 is further formed in the support plate 6, so that an operator can conveniently watch the condition of the internal extrusion operation. The punch 1 can have two structures, one is solid, and the magnesium alloy material arranged in the charging barrel 7 is extruded; one is hollow, the inner hole of the other is matched with the outer surface of the mandrel 5, and the mandrel 5 extends into the inner hole of the punch 1; the magnesium alloy material is sleeved on the mandrel 5, heated and extruded.
in order to achieve uniform temperature and improve heating efficiency, the female die 3 is also provided with a heating hole, and a heating rod for heating needs to be inserted; the specific structure is that the heating holes on the female die 3 correspond to the positions of all or part of the heating holes 8 on the extrusion container 2, and the heating rod can stretch into the heating holes on the female die 3 from the heating holes 8 on the extrusion container 2 and heat simultaneously.
The female die 3 is movably arranged, the female die 3 and the mandrel 5 are replaced according to different extrusion processes, extrusion cavities with various sections are formed, and the requirements of different extrusion processes are met.
As shown in fig. 3, the present invention provides a specific female die 3 and a mandrel 5, forming a specific extrusion cavity: the section of the inner hole of the female die 3 is provided with a reducing area d1 with gradually reduced inner diameter from top to bottom to form a conical structure; a section of sizing area d2 is arranged below the reducing area d1, and the inner diameter of the d2 area is unchanged; corresponding to the reducing region d1 and the sizing region d2, the diameter of the mandrel 5 is unchanged, a tapered cavity with gradually reduced width is formed between the mandrel 5 and the reducing region d1, and a circular cavity with unchanged width is formed between the mandrel 5 and the sizing region d 2; a diameter-expanding shearing area d3 with gradually enlarged inner diameter is arranged below the d2 area, a diameter-reducing shearing area d4 with gradually reduced inner diameter is arranged below the diameter-expanding shearing area d3, and the diameter-expanding shearing area d3 and the diameter-reducing shearing area d4 are in smooth transition connection to form a C-shaped smooth connection structure; the diameter of the mandrel 5 corresponds to the diameter-expanding shearing region d3 and is correspondingly gradually increased, the diameter of the mandrel 5 corresponds to the diameter-reducing shearing region d4 and is correspondingly gradually reduced, and the mandrel 5 corresponds to the outer side surfaces of the diameter-expanding shearing region d3 and the diameter-reducing shearing region d4 to form a C-shaped smooth connecting structure; the width of an annular cavity formed between the mandrel 5 and the diameter-expanding shearing region d3 and the diameter-reducing shearing region d4 is basically constant, the tubular product is subjected to primary shearing treatment between the mandrel 5 and the diameter-expanding shearing region d3, and the tubular product is subjected to secondary shearing and bending treatment between the mandrel 5 and the diameter-reducing shearing region d 4; a section of vertical shaping area d5 with constant inner diameter is arranged below the reducing shearing area d4, the diameter of the mandrel 5 is constant corresponding to the vertical shaping area d5, and a circular ring cavity with constant width is formed; the region performs a shaping process on the pipe after the treatment. The invention completes 4 processes of extrusion, continuous shearing-bending, pipe forming and shaping on the same die, the magnesium alloy blank passes through a reducing section, a sizing section, a shearing section, a bending section and a shaping section in sequence in the forming process, the crystal grains are refined by utilizing the high extrusion ratio of extrusion deformation in a three-dimensional unequal value compression stress state, the large strain in the magnesium alloy material is caused by the large plastic deformation generated by shearing at the equal-interval channel corners, the crystal grains are refined again to improve the uniformity of the structure, and the flow speed of the magnesium alloy is adjusted by utilizing the extrusion deformation and the bending deformation to promote the uniformity and improve the surface quality of the deformed material.
The extrusion cavity formed between the outer side surface of the mandrel 5 and the inner wall surface of the inner hole of the female die 3 has the same width from top to bottom, and an equal-interval and equal-width extrusion channel is formed.
As shown in fig. 4 and 5, in another embodiment of the present invention, the cross section of the inner bore of the female die 3, the reduced diameter region d1, the sizing region d2, the diameter-expanding shearing region d3 and the reduced diameter shearing region d4 are substantially the same as those of the previous embodiment, and the shape of the outer side surface of the mandrel 5 is also substantially the same; in the improvement of this embodiment, one or two or more groups of diameter-expanding shearing zones d3 and diameter-reducing shearing zones d4 are added below one group of diameter-expanding shearing zones d3 and diameter-reducing shearing zones d4 of the female die 3 (i.e., the diameter-expanding shearing zones d3 and the diameter-reducing shearing zones d4 which are smoothly connected are regarded as one group); the diameter of the mandrel 5 corresponds to the diameter expanding and shearing area d3 of the female die 3, and the diameter of the mandrel is gradually increased correspondingly; the diameter of the corresponding reducing shearing area d4 is correspondingly and gradually reduced, and the width of the formed annular cavity is unchanged; two, three or four or more arc-shaped smoothly-turning extrusion cavities are formed between the female die 3 and the mandrel 5, and the magnesium alloy is subjected to multi-pass continuous shearing-bending treatment, so that the crystal grain structure of the magnesium alloy is further improved, and the mechanical property of the magnesium alloy is improved.
The magnesium alloy material 10 is heated in a charging barrel 7 of an extrusion barrel 2, after the required temperature is reached, the extrusion machine is started to drive a punch 1 to downwards enter the charging barrel 7, the magnesium alloy material 10 is extruded, the magnesium alloy material 10 sequentially passes through a reducing section, a sizing section, a shearing section, a bending section and a shaping section, and finally the pipe is obtained through molding.
Selecting a proper extrusion ratio (the extrusion ratio of the embodiment is 9.33), wherein the size outer diameter of the AZ31 magnesium alloy casting blank is phi 39.8mm, the inner diameter is 20.4 phi mm, the extrusion temperature is 380 ℃, the extrusion speed is 23mm/s, the extrusion cylinder and the die are heated to 380 ℃, and a graphite lubricant is adopted. Microstructure observation of the extruded magnesium alloy shows that the microstructure of the blank from the diameter reduction section to extrusion forming is obviously different in each stage, and the change trend is obvious as shown in figures 6-9. The structure of the pipe is mainly equiaxed grains which are uniformly and circularly distributed, and is shown in the figure; the large plastic deformation generated by shearing of equal channel corners leads to large strain in the magnesium alloy material, so that grains are refined again, the uniformity of the structure is improved, and the related performance is improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.

Claims (4)

1. A mould for preparing high-performance magnesium alloy pipes is characterized in that: mainly comprises a punch (1), an extrusion container (2), a female die (3), a base (4), a mandrel (5) and a support plate (6); the punch (1) is movably arranged, the punch (1) is over against a charging barrel (7) of the extrusion barrel (2), moves downwards and then enters the charging barrel (7) to extrude a magnesium alloy material (10) in the charging barrel (7); a heating device is arranged on the extrusion cylinder (2) for heating; the female die (3) is matched with the extrusion cylinder (2), and an inner hole of the female die (3) is opposite to the charging barrel (7); the extrusion container (2) and the female die (3) are arranged on a base (4) with an inner hole, the lower end of the mandrel (5) is arranged on the supporting plate (6), the upper end of the mandrel extends into the inner hole of the female die (3) and is matched with the inner hole of the female die (3), and an extrusion cavity is formed between the outer side surface of the mandrel (5) and the inner wall surface of the inner hole of the female die (3);
The female die (3) is arranged in a cavity at the lower part of the extrusion container (2) and is coated in the extrusion container (2);
a plurality of heating holes (8) are formed in the extrusion container (2), heating rods which generate heat are inserted into the heating holes (8), and the extrusion container and the magnesium alloy material (10) are heated;
The central line of the mandrel (5) is superposed with the central line of the inner hole of the female die (3) to form equally spaced extrusion cavities;
the section of the inner hole of the female die (3) is firstly a section of reducing area d1 with gradually reduced inner diameter from top to bottom to form a conical structure; a section of sizing area d2 is arranged below the reducing area d1, and the inner diameter of the d2 area is unchanged; corresponding to the reducing area d1 and the sizing area d2, the diameter of the mandrel (5) is unchanged, a tapered cavity with gradually reduced width is formed between the mandrel (5) and the reducing area d1, and an annular cavity with unchanged width is formed between the mandrel (5) and the sizing area d 2; a diameter-expanding shearing area d3 with gradually enlarged inner diameter is arranged below the area d2, a diameter-reducing shearing area d4 with gradually reduced inner diameter is arranged below the diameter-expanding shearing area d3, and the diameter-expanding shearing area d3 is smoothly and transitionally connected with the diameter-reducing shearing area d 4; the diameter of the mandrel (5) is correspondingly and gradually increased corresponding to the diameter-expanding shearing area d 3; corresponding to the diameter-reducing shearing area d4, the diameter of the mandrel (5) is correspondingly and gradually reduced, and the width of the formed annular cavity is unchanged; below the reducing shearing area d4, a section of vertical reshaping area d5 with constant inner diameter is arranged, and the diameter of the mandrel (5) is constant and corresponds to the vertical reshaping area d5 to form a circular ring cavity with constant width.
2. The die for preparing the high-performance magnesium alloy pipe according to claim 1, wherein: regarding a diameter-expanding shearing region d3 and a diameter-reducing shearing region d4 which are smoothly connected with each other in the inner hole of the female die (3) as a group, and adding one group or two or more groups of diameter-expanding shearing regions d3 and diameter-reducing shearing regions d4 below a group of diameter-expanding shearing regions d3 and diameter-reducing shearing regions d 4; the diameter of the mandrel (5) is correspondingly and gradually increased corresponding to the diameter-expanding shearing area d 3; the diameter of the corresponding reducing shearing area d4 is correspondingly and gradually reduced, and the width of the formed annular cavity is unchanged; two, three or more than four arc-shaped smoothly-turning extrusion cavities are formed between the female die (3) and the mandrel (5).
3. The die for preparing the high-performance magnesium alloy pipe according to claim 1 or 2, wherein: the female die (3) is provided with a heating hole, and a heating rod which generates heat is inserted for heating.
4. The mold for preparing the high-performance magnesium alloy pipe according to claim 3, wherein: the heating holes on the female die (3) correspond to the positions of partial heating holes (8) on the extrusion container (2), and the heating rods extend into the heating holes on the female die (3) from the heating holes (8) on the extrusion container (2).
CN201810630370.1A 2018-06-19 2018-06-19 mould for preparing high-performance magnesium alloy pipe Active CN108637031B (en)

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Publication number Priority date Publication date Assignee Title
CN109702026A (en) * 2018-12-25 2019-05-03 太原理工大学 A kind of the reciprocating extrusion device and processing method of high-performance magnesium-alloy tubing
CN109702028A (en) * 2018-12-25 2019-05-03 太原理工大学 A kind of extruding method of high-performance magnesium-alloy tubing
CN109702025A (en) * 2018-12-25 2019-05-03 太原理工大学 A kind of reciprocating extrusion processing method of high-performance superfine grained magnesium alloy tubing
CN110743929B (en) * 2019-10-25 2021-04-02 中北大学 Extrusion forming method for magnesium alloy ring piece
CN110743927A (en) * 2019-10-25 2020-02-04 中北大学 Magnesium alloy ring piece extrusion forming die
CN110814077B (en) * 2019-11-25 2020-11-24 重庆理工大学 Quick-change forming die for preparing large-caliber magnesium alloy pipe

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JP4696980B2 (en) * 2006-03-13 2011-06-08 トヨタ自動車株式会社 Hollow material manufacturing apparatus and hollow material manufacturing method
CN100469472C (en) * 2007-03-16 2009-03-18 清华大学 Semi-solid multi-blank extruding process and apparatus for forming double-layer composite pipe
CN101549361B (en) * 2009-05-08 2010-09-29 重庆大学 Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold
CN103240292A (en) * 2013-04-12 2013-08-14 河南理工大学 Production method and device for magnesium alloy thin-wall pipe
CN105880310B (en) * 2016-06-29 2017-07-28 重庆理工大学 A kind of mould and forming method of the hollow magnesium alloy profiles of Ultra-fine Grained
CN106955902B (en) * 2017-05-25 2018-09-14 天津工业大学 Shaping dies and its manufacturing process are squeezed in a kind of rotation of tubing
CN107081343B (en) * 2017-06-20 2019-03-15 重庆理工大学 A kind of continuous plastic processing molding die of magnesium alloy profiles and forming method
CN107685084A (en) * 2017-08-17 2018-02-13 西京学院 A kind of tubing screw extrusion shaping dies and its application method

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