CN108637031A - A kind of mold preparing high-performance magnesium-alloy tubing - Google Patents
A kind of mold preparing high-performance magnesium-alloy tubing Download PDFInfo
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- CN108637031A CN108637031A CN201810630370.1A CN201810630370A CN108637031A CN 108637031 A CN108637031 A CN 108637031A CN 201810630370 A CN201810630370 A CN 201810630370A CN 108637031 A CN108637031 A CN 108637031A
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- cavity plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- Extrusion Of Metal (AREA)
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Abstract
The present invention provides the mold for preparing high-performance magnesium-alloy tubing, punch is movable setting, and the barrel of punch face extrusion cylinder squeezes the magnesium alloy material in barrel after moving down；Heating device is provided on extrusion cylinder to be heated；Cavity plate is equipped with extrusion cylinder, endoporus and the barrel face of cavity plate；Extrusion cylinder, cavity plate are arranged on the pedestal with endoporus, and mandrel lower end is arranged on the supporting plate, and the endoporus of cavity plate is stretched into upper end, the inner hole with cavity plate, between the lateral surface and the internal face of cavity plate endoporus of mandrel, are formed and squeeze cavity.The present invention has been completed at the same time extruding, continuous shear stress bending, forming tubular product, 4 procedure of shaping on same mold, and technique process is less, reduces waste material, has saved the energy；Extruding and continuous confined strip shearing can introduce large strain rate, promote the generation of ultra-fine grained magnesium alloy dynamic recrystallization, can more play the plastic deformation ability of ultra-fine grained magnesium alloy material；Ultra-fine grained magnesium alloy thin-wall pipes can be produced in batches.
Description
Technical field
The present invention relates to a kind of mold of metal material processing, especially a kind of moulds preparing high-performance magnesium-alloy tubing
Tool.
Background technology
In the industrial production, tubing mainly passes through molding die extrusion forming tubing in process of manufacture；It is traditional light
Alloy plastic deformation's technique includes multiple stages such as ingot casting preparation, ingot casting processing, blank heating, pyroplastic deformation.
With regard to manufacturing ultra-fine peritectic alloy（Light-alloy）For tubing, especially thin-walled and high-precision light-alloy tubing, currently,
It is main to be molded by the way of squeezing, but in traditional extrusion process of production, generally forward extrusion, forward extrusion can be formed along tubing
The banded structure of the direction of extrusion and strong basal plane texture, seriously reduce the mechanical property of magnesium alloy, and cause mechanical property
Anisotropy, these texture are unfavorable for the secondary operation of light wall pipe（Such as internal high pressure forming, dog-ear, simmering and bending）；It is easy to cause light
Shrinkage cavity in alloy casting structure, it is loose the defects of so that the machining accuracy of tubing especially light wall pipe is deteriorated.Also, tradition is squeezed
Light-alloy tubing lateral cross section after pressure is organized as equi-axed crystal, and the longitudinal cross-section tissue after extruding becomes elongate grains, and
It is particularly evident.Simultaneously as stringent to the obdurability of thin-wall pipes, secondary forming performance and dimension precision requirement, it is necessary to use
The integrated plastic molding method of shape control is controlled, realizes that filling is complete, deform uniformly and forming process heterogeneous microstructure is drilled
The coordination of change controls, this is also the hot issue of current Plastic Forming area research.
Current magnesium industry is badly in need of the batches of high-performance magnesium-alloy new material of development, the former magnesium of advanced inexpensive low energy consumption produces
The complete set technology of technology, large-size ultra-thin and complex parts production, extruding, continuous shear stress-can be completed at the same time by being especially a lack of
Bending, forming tubular product, shaping one set of die, market and the needs of user cannot be met.
Invention content
The present invention is directed to the above-mentioned deficiency of the prior art, and the purpose of the present invention is to provide a kind of hollow magnesium alloy profiles
Molding die provides a kind of magnesium alloy pipe being completed at the same time extruding-shearing-bending-shaping composite deformation and prepares mold.
To achieve the above object, the present invention provides the following technical solutions：The mold of high-performance magnesium-alloy tubing is prepared, it is special
Sign is：Include mainly punch, extrusion cylinder, cavity plate, pedestal, mandrel and support plate；Punch is movable setting, and punch face is squeezed
The barrel of pressure cylinder moves down laggard feeding cylinder, squeezes the magnesium alloy material in barrel；Heating dress is provided on extrusion cylinder
It sets and is heated；Cavity plate is equipped with extrusion cylinder, endoporus and the barrel face of cavity plate；Extrusion cylinder, cavity plate are arranged with interior
On the pedestal in hole, mandrel lower end is arranged on the supporting plate, and the endoporus of cavity plate is stretched into upper end, the inner hole with cavity plate, mandrel
Between lateral surface and the internal face of cavity plate endoporus, is formed and squeeze cavity.
Further feature is：The cavity plate is arranged in the cavity of extrusion cylinder lower part, is squeezed in pressure cylinder is coated on.
It is provided with several bottoming holes on extrusion cylinder, the heating rod of fever is inserted into bottoming hole, to extrusion cylinder and magnesium
Alloy material is heated.
The center line of mandrel is overlapped with the center line of cavity plate endoporus, is formed and is squeezed cavity at equal intervals.
Bottoming hole is provided on cavity plate, the heating rod for being inserted into fever is heated.
Bottoming hole on cavity plate, corresponding with the part heating hole site on extrusion cylinder, heating rod is from the heating on extrusion cylinder
Hole is stretched into the bottoming hole on cavity plate.
The section of the endoporus of cavity plate is the undergauge area d1 that one section of internal diameter reduces first from top to bottom, forms pyramidal structure；Contracting
It is one section of sizing area d2 below diameter area d1, the internal diameter in the areas d2 is constant；Corresponding undergauge area d1 and sizing area d2, the diameter of mandrel 5 is not
Become, the diminishing conical cavity of formation width between mandrel 5 and undergauge area d1, formation width is not between mandrel 5 and sizing area d2
The annulus chamber of change；It is one below expanding shear zone d3 in the areas d2 in the following, being the expanding shear zone d3 that one section of internal diameter is gradually expanded
The section diminishing undergauge shear zone d4 of internal diameter, is connected smoothly between expanding shear zone d3 and undergauge shear zone d4；It is corresponding
Expanding shear zone d3,5 diameter of mandrel, which corresponds to, gradually to be increased；Corresponding undergauge shear zone d4,5 diameter of mandrel correspondence are gradually reduced, shape
At ring-shaped cavity width it is constant；In undergauge shear zone d4 in the following, being the constant vertical shaping region d5 of one section of internal diameter, mandrel 5 is right
Vertical shaping region d5 is answered, diameter is constant, the constant annulus chamber of formation width.
The expanding shear zone d3 being smoothly connected and undergauge shear zone d4 of the endoporus of cavity plate are considered as one group, it is expanding at one group
Below shear zone d3 and undergauge shear zone d4, increase by one group or two groups or three groups or more of expanding shear zone d3 and undergauge shearing
Area d4；Mandrel corresponds to expanding shear zone d3, and diameter, which corresponds to, gradually to be increased；Corresponding undergauge shear zone d4, diameter correspondence are gradually reduced,
The ring-shaped cavity width of formation is constant；Between cavity plate and mandrel, twice are formed, the arc of three tetra- or more Dao Huo is smoothly turned
Extruding cavity.
Mold is handled relative to existing magnesium alloy, the mold for preparing high-performance magnesium-alloy tubing of the invention has such as
Lower advantageous effect：
1, it has been completed at the same time extruding, continuous shear stress-bending, forming tubular product, 4 procedure of shaping on same mold, has compared tubing
Hot extrusion technique process is less, and reduces waste material, has saved the energy；Also, it squeezes and continuous confined strip shearing can introduce greatly
Strain rate promotes the generation of ultra-fine grained magnesium alloy dynamic recrystallization, can more play the plastic deformation ability of ultra-fine grained magnesium alloy material
Power avoids cracking under big strained condition, reduces or eliminates the hole defect of organization internal；Pass through tubing progressive forming temperature
Degree and speed, mould structure regulation and control can control the deformation extent and uniformity of tubing, to control the degree and base of crystal grain refinement
The intensity and tubing precision of plane texture can produce ultra-fine grained magnesium alloy thin-walled (1-5mm) tubing in batches；Make crystal grain thinning and at
Shape it is efficient, and have efficient, energy-efficient characteristic.
2, the mould structure is simple, and production cost is low, and cooperation vertical extruder uses；It is squeezed by the mold of the application
Type tubing, can continuous-stable produced, simplify production technology, shorten the production cycle, prepare and production ultra-fine grained magnesium alloy material
Expect that the time is short, forming speed is fast, production efficiency is made to greatly improve, automation is realized convenient for automatically controlling；And it is ultra-fine improving
There are larger potentiality in terms of grained magnesium alloy mechanical property and forming ability, continuous, large-sized ultra-fine crystal magnesium may be implemented
The production of alloy pipe is suitble to prepare the poor magnesium alloy pipe of plasticity, applied widely.
3, the strong plasticity of ultra-fine grained magnesium alloy tubing of present apparatus production is good；Optimized by technique and mold structure parameter, energy
The defects of enough eliminating micro- hole in ultra-fine grained magnesium alloy, the compactness for improving material, broken dendrite are formed tiny isometric
Crystalline substance, and promote basal plane texture attenuation, to ensure the forming accuracy and mechanical property of tubing, and can be by adjusting shearing number
Regulate and control microstructure and texture with shear strength, to improve the reliability and controllability of tubing, it is super to can be applied to magnalium titanium etc.
Fine grain magnesium alloy pipe shapes.
4, compared with the method for other big strain crystal grain refinements, this method has larger practicability, can be mounted directly
It is squeezed on large-size extruder.
5, compared with common extruding, this method increases shear stage, bending stage and truing phase, can improve
The uniformity of metal flow improves the finish of material surface to the maximum extent.
6, prepare and produce that the magnesium alloy materials time is short, forming speed is fast, can be with continuous production, productivity is high.It is applicable in model
It encloses extensively, it is easy to operate.
7, the strong plasticity of magnesium alloy materials of present apparatus production is good, and the preparation process provided is simple, significantly reduces product cost
While have environmental-friendly feature, have a extensive future.
Description of the drawings
Fig. 1 is mould structure front view in the present invention；
Fig. 2 be Fig. 1 along a-a to sectional view；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is second of example structure sectional view；
Fig. 5 is the partial enlarged view of Fig. 4；
Fig. 6 is longitudinal tissue of the embodiment Jing Guo undergauge section；
Fig. 7 is longitudinal tissue of the embodiment after once shearing；
Fig. 8 is longitudinal tissue of the embodiment by primary shearing and first order buckling；
Fig. 9 is the longitudinal tissue of plastic section tubing in embodiment.
In figure：1-punch, 2-extrusion cylinders, 3-cavity plates, 4-pedestals, 5-mandrels, 6-support plates, 7-barrels, 8-
Bottoming hole, 9-peep holes, 10-magnesium alloy material.
Specific implementation mode
Below with reference to the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, 2, 3, the present invention provides a kind of molds preparing high-performance magnesium-alloy tubing, include mainly punch
1, extrusion cylinder 2, cavity plate 3, pedestal 4, mandrel 5 and support plate 6 etc., punch 1 is movable setting, in pressurizing unit（Extruder）Band
It is moved up and down under dynamic, the barrel 7 of 1 face extrusion cylinder 2 of punch moves down laggard feeding cylinder 7, to the magnesium alloy material in barrel 7
10 are squeezed；It is provided with heating device on extrusion cylinder 2 to be heated, can specifically be provided with several bottoming holes 8, add
Be inserted into the heating rod of fever in hot hole 8, extrusion cylinder and magnesium alloy material 10 heated, reach technological requirement temperature and
Homogeneous heating degree；Cavity plate 3 is equipped with extrusion cylinder 2, and endoporus and 7 face of barrel of cavity plate 3 form magnesium alloy material when squeezing
Movable passageway；Cavity plate 3 is specifically located in the cavity of 2 lower part of extrusion cylinder, is squeezed in pressure cylinder 2 is coated on.Extrusion cylinder 2, cavity plate 3 are set
It sets on the pedestal 4 with endoporus, 5 lower end of mandrel is arranged in support plate 6, and the endoporus of cavity plate 3 is stretched into upper end, with cavity plate 3
Inner hole forms between the internal face of 3 endoporus of lateral surface and cavity plate of mandrel 5 and squeezes cavity, specifically when installation, mandrel 5
Center line overlapped with the center line of 3 endoporus of cavity plate, the gap between the internal face of 3 endoporus of lateral surface and cavity plate of mandrel 5 is equal
Even, formation is equidistant, uniformly squeezes cavity.As needed, peep hole 9 is additionally provided in support plate 6, person easy to operation sees
The case where seeing Inner extrusion operation.Punch 1 can squeeze the magnesium alloy being arranged in barrel 7 there are two types of structure, one is solid
Material；One is hollow, the outer surface of endoporus and mandrel 5 coordinates, and mandrel 5 stretches into the endoporus of punch 1；Magnesium alloy material is sleeved on
On mandrel 5, heats and be extruded.
In order to which temperature is uniform and improves the efficiency of heating surface, it is also equipped with bottoming hole on cavity plate 3, it is also desirable to be inserted into adding for fever
Hot pin is heated；Concrete structure is 8 position pair of all or part of bottoming hole on the bottoming hole on cavity plate 3, with extrusion cylinder 2
It answers, heating rod can be stretched into from the bottoming hole 8 on extrusion cylinder 2 in the bottoming hole on cavity plate 3, be heated simultaneously.
Cavity plate 3 is movable setting, according to different extrusion process, replaces cavity plate 3 and mandrel 5, forms squeezing for multiple section
Die mould chamber meets the needs of different extrusion process.
As shown in figure 3, a kind of specific cavity plate 3 of present invention offer and mandrel 5, one kind of formation is specific to squeeze cavity：
The section of the endoporus of cavity plate 3 is from top to bottom the diminishing undergauge area d1 of one section of internal diameter, forms pyramidal structure；Undergauge area d1
Here is one section of sizing area d2, and the internal diameter in the areas d2 is constant；Corresponding undergauge area d1 and sizing area d2, the diameter of mandrel 5 is constant, mandrel
The diminishing conical cavity of formation width between 5 and undergauge area d1, the constant annulus of formation width between mandrel 5 and sizing area d2
Chamber；In the areas d2 in the following, being the expanding shear zone d3 that one section of internal diameter is gradually expanded, be one section of internal diameter below expanding shear zone d3 by
Tapered small undergauge shear zone d4, is connected smoothly between expanding shear zone d3 and undergauge shear zone d4, forms " C " word
Shape is smoothly connected structure；Mandrel 5 corresponds to expanding shear zone d3, and diameter, which corresponds to, gradually to be increased, and mandrel 5 corresponds to undergauge shear zone
D4, diameter correspondence are gradually reduced, and mandrel 5 corresponds to the lateral surface of expanding shear zone d3 and undergauge shear zone d4, is formed one " C "
Font is smoothly connected structure；Between mandrel 5 and expanding shear zone d3 and undergauge shear zone d4, the ring-shaped cavity width of formation is basic
It is invariable, between mandrel 5 and expanding shear zone d3, a shear treatment formed to tubing, mandrel 5 and undergauge shear zone d4 it
Between, second of shearing and bending process are formed to tubing；In undergauge shear zone d4 in the following, being constant vertical whole of one section of internal diameter
Shape area d5, mandrel 5 correspond to vertical shaping region d5, and diameter is constant, the constant annulus chamber of formation width；The region is to aforementioned processing
Tubing afterwards carries out Shape correction.The present invention be completed at the same time on same mold extruding, continuous shear stress-bending, forming tubular product,
4 procedure of shaping passes through undergauge section, sizing section, shearind section, bending section and shaping in magnesium alloy blank forming process successively
Section, using the high extrusion ratio crystal grain thinning of crimp under three-dimensional non-equivalence compressing stress state, utilizes equidistant channel corner
The large plastometric set that generates of shearing lead to the big strain inside magnesium alloy materials, to which crystal grain thinning again improves the equal of tissue
Even property, the flowing velocity that magnesium alloy is adjusted using crimp and flexural deformation promote surface matter that is uniform, improving deformable material
Amount.
The extruding cavity formed between the internal face of 3 endoporus of lateral surface and cavity plate of mandrel 5 of the present invention, width from top to bottom
Degree is most preferably to maintain equal, equidistant, the wide squeezing passage of formation.
As shown in Figure 4,5, extruding cavity of the invention, another specific embodiment structure, the endoporus of cavity plate 3 are cut
Face, undergauge area d1, sizing area d2, expanding shear zone d3, undergauge shear zone d4 are essentially identical with the structure of preceding embodiment,
The lateral surface shape of mandrel 5 is also essentially identical；The improvement of the present embodiment is one group of expanding shear zone d3 and undergauge in cavity plate 3
Below the d4 of shear zone（The expanding shear zone d3 and undergauge shear zone d4 that will be smoothly connected are considered as one group）, increase by one group or two
The expanding shear zone d3 and undergauge shear zone d4 of group or three groups or more；Mandrel 5 corresponds to the expanding shear zone d3 of cavity plate 3, diameter pair
Should gradually it increase；Corresponding undergauge shear zone d4, diameter correspondence are gradually reduced, and the ring-shaped cavity width of formation is constant；Cavity plate 3 and core
Between axis 5, twice are formed, the extruding cavity that the arc of three tetra- or more Dao Huo is smoothly turned, company of the magnesium alloy through multi-pass
Continuous shearing-bending process, further improves its grain structure, improves its mechanical performance.
Magnesium alloy material 10 is heated in the barrel 7 of extrusion cylinder 2, after the temperature for reaching requirement, is opened extruder and is driven punching
First 1 is downwardly into barrel 7, extrusion magnesium alloy material 10, and magnesium alloy material 10 passes through undergauge section, sizing section, shearind section, bending section successively
And plastic section, final molding obtain tubing.
Select suitable extrusion ratio（The extrusion ratio of the present embodiment is 9.33）, the diameter of AZ31 magnesium alloy strands is Ф
39.8mm, internal diameter are 20.4 Ф mm, and the temperature of extruding is 380 DEG C, and extrusion speed 23mm/s, extrusion cylinder and mold are heated to
380 DEG C, using graphitic lubricant.Microstructure observation discovery carried out to magnesium alloy after extruding, blank is from undergauge section to being extruded into
Shape, there are notable differences for each stage tissue, and as Figure 6-9, variation tendency is apparent.Tubing tissue is mainly the circle that is evenly distributed
Whole equi-axed crystal, as shown in the figure；The large plastometric set that the shearing of equal channel angular generates causes big inside magnesium alloy materials
Strain improves correlated performance to which crystal grain thinning improves the uniformity of tissue again.
Finally, it should be noted that technical side the above examples are only used to illustrate the technical scheme of the present invention and are not limiting
Case, although applicant describes the invention in detail with reference to preferred embodiment, those skilled in the art should manage
Solution, those are modified or replaced equivalently technical scheme of the present invention, without departing from the objective and range of the technical program,
It is intended to be within the scope of the claims of the invention.
Claims (8)
1. a kind of mold preparing high-performance magnesium-alloy tubing, it is characterised in that：It include mainly punch（1）, extrusion cylinder（2）, it is recessed
Mould（3）, pedestal（4）, mandrel（5）And support plate（6）；Punch（1）It is movable setting, punch（1）Face extrusion cylinder（2）Material
Cylinder（7）, move down laggard feeding cylinder（7）, to barrel（7）Interior magnesium alloy material（10）It is squeezed；Extrusion cylinder（2）Upper setting
There is heating device to be heated；Cavity plate（3）With extrusion cylinder（2）It is equipped with, cavity plate（3）Endoporus and barrel（7）Face；It squeezes
Cylinder（2）, cavity plate（3）It is arranged in the pedestal with endoporus（4）On, mandrel（5）Lower end is arranged in support plate（6）On, upper end is stretched into
Cavity plate（3）Endoporus, with cavity plate（3）Inner hole, mandrel（5）Lateral surface and cavity plate（3）Between the internal face of endoporus, shape
At extruding cavity.
2. the mold according to claim 1 for preparing high-performance magnesium-alloy tubing, it is characterised in that：The cavity plate（3）If
It sets in extrusion cylinder（2）In the cavity of lower part, it is squeezed pressure cylinder（2）In being coated on.
3. the mold according to claim 1 for preparing high-performance magnesium-alloy tubing, it is characterised in that：Extrusion cylinder（2）On set
It is equipped with several bottoming holes（8）, in bottoming hole（8）The interior heating rod for being inserted into fever, to extrusion cylinder and magnesium alloy material（10）Into
Row heating.
4. according to any mold for preparing high-performance magnesium-alloy tubing of claim 1-3, it is characterised in that：Mandrel（5）
Center line and cavity plate（3）The center line of endoporus overlaps, and is formed and squeezes cavity at equal intervals.
5. according to any mold for preparing high-performance magnesium-alloy tubing of claim 1-3, it is characterised in that：In cavity plate
（3）On be provided with bottoming hole, the heating rod for being inserted into fever is heated.
6. the mold according to claim 5 for preparing high-performance magnesium-alloy tubing, it is characterised in that：Cavity plate（3）On plus
Hot hole, with extrusion cylinder（2）On part bottoming hole（8）Position corresponds to, and heating rod is from extrusion cylinder（2）On bottoming hole（8）It stretches into
Cavity plate（3）On bottoming hole in.
7. the mold according to claim 4 for preparing high-performance magnesium-alloy tubing, it is characterised in that：Cavity plate（3）Endoporus
Section, from top to bottom first be the diminishing undergauge area d1 of one section of internal diameter, formed pyramidal structure；It is one below undergauge area d1
Section sizing area d2, the internal diameter in the areas d2 are constant；Corresponding undergauge area d1 and sizing area d2, mandrel（5）Diameter it is constant, mandrel（5）With
The diminishing conical cavity of formation width, mandrel between undergauge area d1（5）The constant annulus of formation width between the d2 of sizing area
Chamber；In the areas d2 in the following, being the expanding shear zone d3 that one section of internal diameter is gradually expanded, be one section of internal diameter below expanding shear zone d3 by
Tapered small undergauge shear zone d4, is connected smoothly between expanding shear zone d3 and undergauge shear zone d4；Corresponding expanding shearing
Area d3, mandrel（5）Diameter, which corresponds to, gradually to be increased；Corresponding undergauge shear zone d4, mandrel（5）Diameter correspondence is gradually reduced, formation
Ring-shaped cavity width is constant；In undergauge shear zone d4 in the following, being the constant vertical shaping region d5 of one section of internal diameter, mandrel（5）It is corresponding
Vertical shaping region d5, diameter is constant, the constant annulus chamber of formation width.
8. the mold according to claim 7 for preparing high-performance magnesium-alloy tubing, it is characterised in that：By cavity plate（3）It is interior
The expanding shear zone d3 being smoothly connected and undergauge shear zone d4 in hole are considered as one group, are sheared in one group of expanding shear zone d3 and undergauge
Below area d4, increase by one group or two groups or three groups or more of expanding shear zone d3 and undergauge shear zone d4；Mandrel（5）It is corresponding to expand
Diameter shear zone d3, diameter, which corresponds to, gradually to be increased；Corresponding undergauge shear zone d4, diameter correspondence are gradually reduced, the ring-shaped cavity of formation
Width is constant；Cavity plate（3）With mandrel（5）Between, form twice, the extrusion pressing type that the arc of three tetra- or more Dao Huo is smoothly turned
Chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810630370.1A CN108637031B (en) | 2018-06-19 | 2018-06-19 | mould for preparing high-performance magnesium alloy pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810630370.1A CN108637031B (en) | 2018-06-19 | 2018-06-19 | mould for preparing high-performance magnesium alloy pipe |
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| Publication Number | Publication Date |
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| CN108637031A true CN108637031A (en) | 2018-10-12 |
| CN108637031B CN108637031B (en) | 2019-12-06 |
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| CN201810630370.1A Active CN108637031B (en) | 2018-06-19 | 2018-06-19 | mould for preparing high-performance magnesium alloy pipe |
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| 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 |
| 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 |
| CN110743929A (en) * | 2019-10-25 | 2020-02-04 | 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 |
| CN110814077A (en) * | 2019-11-25 | 2020-02-21 | 重庆理工大学 | Quick-change forming die for preparing large-caliber magnesium alloy pipe |
| CN111889533A (en) * | 2020-07-24 | 2020-11-06 | 中北大学 | High-performance aluminum-magnesium alloy pipe expanding rotary extrusion forming die |
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| CN113941613A (en) * | 2021-09-30 | 2022-01-18 | 哈尔滨工业大学（威海） | Spiral extrusion device and extrusion process for magnesium and magnesium alloy seamless pipes |
| CN116020894A (en) * | 2023-03-29 | 2023-04-28 | 太原科技大学 | Equal-channel double-corner variable-diameter extrusion forming die and process for annular cylindrical part |
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