CN110369541A - Channel pressings mold and its application methods such as a kind of axial-radial alternative expression - Google Patents
Channel pressings mold and its application methods such as a kind of axial-radial alternative expression Download PDFInfo
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- CN110369541A CN110369541A CN201910717997.5A CN201910717997A CN110369541A CN 110369541 A CN110369541 A CN 110369541A CN 201910717997 A CN201910717997 A CN 201910717997A CN 110369541 A CN110369541 A CN 110369541A
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- blank
- radial compression
- sliding block
- radial
- squeezing passage
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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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
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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
Abstract
The present invention relates to channel pressings mold and its application methods such as a kind of axial-radial alternative expression, including Extruding die and radial compression sliding block, squeezing passage is provided in the Extruding die, the turning of the squeezing passage setting arc-shaped, it is provided with the extrusion head that can be moved up and down at the squeezing passage upper end opening, the cross-sectional sizes of the extrusion head and squeezing passage match；The Extruding die is also set up and squeezing passage is in the disconnected slider guide T-slot of corner; the slider guide T-slot provides guide function for radial compression sliding block; the radial compression sliding block is fixedly connected with the piston rod for stretching out Extruding die; the other end of piston rod is connected with piston-type hydraulic cylinder, and piston-type hydraulic cylinder can drive radial compression sliding block to be moved along slider guide T-slot by piston rod.The present invention has the effect of improving blank deformation degree, enhances crystal grain refinement, material is made smoothly to be extruded angled channel, reduce ram load burden, improve die life.
Description
Technical field
The present invention relates to channel pressings mold and its application methods such as a kind of axial-radial alternative expression, belong to equal channel pressings
Technical field.
Background technique
Equal channel pressings technology is also referred to as Equal-channel Angular Pressing (ECAP) technology, is a kind of to prepare micro-nano crystal block of material
NEW PLASTIC processing method, it is equal to late 1970s in the deformation texture of Study on Steel and microcosmic by scientist Segal
It is put forward for the first time when tissue.Equal channel pressings technology mainly passes through intimate pure shear effect in deformation process and carries out to the crystal grain of material
Refinement, so that material inside organization high uniformity can not only be made by significantly improving the mechanical performance of material and the physical property technology
And there is wide applicability, it is obtained in the multiple materials such as pure metal, heterogeneous alloy and metal-base composites at present
Obtained good application effect.
But when common equal channel pressings method extruding, metal material is needed in squeezing passage corner flow difficulties
Metal flow can just be promoted by increasing extruding force, to be easy to cause mold excessive in squeezing passage corner stress, be often resulted in
Die failure or service life reduction affect the development of the technique.
Summary of the invention
The object of the present invention is to provide channel pressings mold and its application methods such as a kind of axial-radial alternative expression, have and mention
High blank deformation degree enhances crystal grain refinement, material is made smoothly to be extruded angled channel, reduce ram load burden, improve mould
Has the effect in service life.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of channel pressings molds such as axial-radial alternative expression, including Extruding die and radial compression sliding block, the extruding
Squeezing passage is provided in cavity plate, the squeezing passage is arranged the turning of arc-shaped, is provided at the squeezing passage upper end opening
The cross-sectional sizes of the extrusion head that can be moved up and down, the extrusion head and squeezing passage match；The Extruding die is also set
It sets and squeezing passage is in the disconnected slider guide T-slot of corner, the slider guide T-slot provides for radial compression sliding block
Guide function, the radial compression sliding block can be movable in the slider guide T-slot of Extruding die, and the radial compression sliding block is solid
Surely it is connected with the piston rod for stretching out Extruding die, the other end of the piston rod is connected with piston-type hydraulic cylinder, piston hydraulic
Cylinder can drive radial compression sliding block to be moved along the guiding of slider guide T-slot by piston rod.
The innovation of technical solution of the present invention is, comprising the following steps:
S1, blank one is placed in squeezing passage, then controls extrusion head and compress axially blank one, blank one is squeezing
It is deformed in pressure passageway, blank front end is extruded into squeezing passage corner；
S2, adjustment extrusion head return to initial position, then start piston-type hydraulic cylinder and drive radial compression sliding block to base
Material one implements radial compression, and blank one is radial to deform, and radial dimension reduces；
After S3, piston-type hydraulic cylinder driving radial compression sliding block return to initial position, it is put into blank two, therewith extrusion head
It is compressed axially again, simultaneously compressive deformation occurs for two blanks, and the middle position of blank one is extruded into squeezing passage and turns
At angle；
S4, adjustment extrusion head returns to initial position again, then starts piston-type hydraulic cylinder and drives radial compression sliding block
Radial compression is implemented to blank one and blank two, blank one and two radial direction of blank deform, and radial dimension reduces；
S5, make again piston-type hydraulic cylinder driving radial compression sliding block return to initial position, therewith extrusion head again into
Simultaneously compressive deformation occurs for row axial compression, two blanks, and the terminal position of blank one is extruded into squeezing passage corner；
S6, adjustment extrusion head returns to initial position again, then starts piston-type hydraulic cylinder and drives radial compression sliding block
Radial compression is implemented to blank one and blank two, blank one and two radial direction of blank deform, and radial dimension reduces；
S7, so that piston-type hydraulic cylinder driving radial compression sliding block is returned to initial position again, be put into blank three, squeeze therewith
Pressure head is compressed axially again, and compressive deformation occurs simultaneously for three blanks, and blank one is smoothly squeezed out squeezing passage turning, base
Expect that two front ends enter squeezing passage turning, so far completes a circulation；
S8, it is put into the 4th block of blank, repeats step S1 to step S7.
The innovation of technical solution of the present invention is: the operating distance of the single radial compression of the radial compression sliding block
S is determined that numerical value is calculated by the following formula by material yield strength:
In formula, the operating distance S unit of single radial compression is mm；σsFor the yield strength of material；D is that squeezing passage is straight
Diameter.
By adopting the above-described technical solution, the technical effect that the present invention obtains has:
The present invention provides channel pressings mold and its application methods such as a kind of axial-radial alternative expression, passes through extrusion head axis
To movement and piston-type hydraulic cylinder drive radial compression sliding block along slider guide T-slot radial motion alternately so that base
Material is subjected to multiple radial compression deformation while generating acutely shear-deformable, improves the deformation extent of blank, enhances it
Grain refining effect.The more appearance that blank can be made to flow in squeezing passage corner by the effect of radial compression sliding block simultaneously
Easily, the load burden for reducing pressure head, can be improved die life, have important practical usage and application value.
The present invention by Extruding die setting and squeezing passage in the disconnected slider guide T-slot of corner, sliding block
Guiding T-slot can provide guide function for radial compression sliding block, make radial compression sliding block can be in the slider guide T of Extruding die
It is movable in type groove, while radial compression sliding block is fixedly connected with the piston rod for stretching out Extruding die, the other end connection of piston rod
Have a piston-type hydraulic cylinder, piston-type hydraulic cylinder can be driven by piston rod radial compression sliding block along slider guide T-slot into
Row movement.To realize that material squeezes out channel under conditions of axially and radially alternative expression squeezes.
Detailed description of the invention
Fig. 1 is overall structure initial position schematic diagram of the present invention；
Fig. 2 is the deformed operating position schematic diagram of radial compression sliding block radial compression of the present invention；
Fig. 3 is inventive die entirety axonometric drawing；
Fig. 4 is the axonometric drawing of radial compression sliding block of the present invention；
Fig. 5 is inventive die radial compression sliding block top view.
Wherein, 1, piston-type hydraulic cylinder, 2, piston rod, 3, radial compression sliding block, 4, extrusion head, 5, blank one, 6, base
Expect two, 7, Extruding die, 8, squeezing passage, 9, slider guide T-slot.
Specific embodiment
By the technology contents of the detailed present invention, structure feature, reach purpose and efficacy, below with reference to Figure of description
It is described in detail.
The present invention provides a kind of axially and radially channel pressings mold such as alternative expression, as shown in Figs. 1-5 comprising piston type
Hydraulic cylinder 1, radial compression sliding block 3, axial compression pressure head 4, blank 1, blank 26, Extruding die 7, squeezes and leads to piston rod 2
Road 8, slider guide T-slot 9.Radial compression sliding block 3 is fixedly connected with piston-type hydraulic cylinder 1 using piston rod 2, mold to be extruded
After the completion of connection, it can start the equal channel pressings to blank.
Squeezing passage 8, the horizontal segment and vertical section of squeezing passage 8, and horizontal segment and vertical have been opened in Extruding die 7
Section is connected using fillet.The extrusion head 4 that can be moved up and down is installed at the upper end opening of squeezing passage 8, extrusion head 4
Cross sectional shape is " T " font, the lower partial cross section width size of the extrusion head 4 and width of squeezing passage 8 is equal in magnitude or phase
Within poor 4mm.
Extruding die 7 is also set up with squeezing passage 7 in the disconnected slider guide T-slot 9 of corner, slider guide T-type
Slot 9 is that radial compression sliding block 3 provides guide function, while radial compression sliding block 4 can be along the slider guide T-slot 9 of Extruding die 7
Interior activity；Radial compression sliding block 4 is fixedly connected with the piston rod 2 for stretching out Extruding die 7, and the other end of piston rod 2 is connected with work
Plunger type hydraulic cylinder 1, piston-type hydraulic cylinder 1 can drive radial compression sliding block 3 along slider guide T-slot 9 by piston rod 2
Guiding is moved.
Radial compression sliding block 3 forms the squeezing passage 8 of complete closure with Extruding die 7, and radial compression sliding block 3 is logical along squeezing
The fillet in road 8 moves radially, and carries out radial compression to blank.
Specifically, the present invention provides a kind of axially and radially channel pressings technique such as alternative expression, comprising the following steps:
S1, blank one is placed in squeezing passage 8, then controls extrusion head 4 and compresses axially blank 1, blank 1
It is deformed in squeezing passage 8, one 5 front end of blank is extruded into squeezing passage corner；
S2, adjustment extrusion head 4 return to initial position, then start piston-type hydraulic cylinder 1 and drive radial compression sliding block 3 right
Blank 1 implements radial compression, and blank 1 is radial to deform, and radial dimension reduces；
After S3, piston-type hydraulic cylinder 1 drive radial compression sliding block 3 to return to initial position, it is put into blank 26, is squeezed therewith
Pressure head 4 is compressed axially again, and simultaneously compressive deformation occurs for two blanks, and the middle position of blank 1 is extruded into extruding
Channel corner；
S4, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and blank 1, blank 26 are radial to deform, and radial dimension reduces；
S5, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, extrusion head 4 is again therewith
It is compressed axially, simultaneously compressive deformation occurs for two blanks, and the terminal position of blank 1 is extruded into squeezing passage turning
Place；
S6, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and blank one 5,26 is radial to deform, and radial dimension reduces；
S7, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, be put into blank three, squeeze therewith
Pressure pressure head 4 is compressed axially again, and compressive deformation occurs simultaneously for three blanks, and blank 1 is smoothly squeezed out squeezing passage and turned
Angle, 26 front end of blank enter squeezing passage turning, so far complete a circulation.
S8, it is put into the 4th block of blank, repeats step S1 to step S7.
Here is specific embodiment:
Embodiment 1
To diameter 25mm, the cylindrical fine aluminium blank of high 35mm should use 6 width D of small size extrusion die squeezing passage
For 25mm, in 200 DEG C of temperature 3 inferior channel pressings severe deformations of progress, concrete operations are as follows:
S1, fine aluminium blank 1 is placed into squeezing passage 8, then controls extrusion head 4 and squeezes fine aluminium blank 1, it is pure
Aluminium blank 1 is deformed in squeezing passage 8, and one 5 front end of fine aluminium blank is extruded into 6 corner of squeezing passage；
S2, adjustment extrusion head 4 return to initial position, then start piston-type hydraulic cylinder 1 and radial compression sliding block 3 is driven to squeeze
Fine aluminium blank 1 is pressed, fine aluminium blank 1 deforms again, and radial dimension reduces；The moving distance of radial compression sliding block 3 by
Material yield strength determines that numerical value is calculated by formula, operating distance formula are as follows:
The formula scope of application is yield strength σsMaterial between 20MPa-400MPa.
For commercial-purity aluminium, yield strength σsFor 30~50MPa, material yield strength σ hereinsAbout 40MPa, by σs
=40MPa and D=25mm substitutes into formula and calculates, and radial compression sliding block moving distance S is 1.813mm；
After S3, piston-type hydraulic cylinder 1 drive radial compression sliding block 3 to return to initial position, it is put into fine aluminium blank 26, therewith
Extrusion head 4 is compressed axially again, and simultaneously compressive deformation occurs for two blanks, and the middle position of fine aluminium blank 1 is squeezed
It is depressed into 6 corner of squeezing passage；
S4, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and blank 1, blank 26 are radial to deform, and radial dimension reduces；
S5, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, extrusion head 4 is again therewith
It is compressed axially, simultaneously compressive deformation occurs for two blanks, and the terminal position of fine aluminium blank 1 is extruded into squeezing passage and turns
At angle；
S6, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and fine aluminium blank 1, blank 26 are radial to deform, and radial dimension subtracts
It is small；
S7, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, be put into fine aluminium blank three, with
Extrusion head 4 compressed axially again, compressive deformation occurs simultaneously for three blanks, and fine aluminium blank 1 is squeezed by smooth squeeze out
8 turning of pressure passageway, 26 front end of blank enter squeezing passage turning, so far complete a circulation.
S8, it is put into the 4th block of blank, repeats step S1 to step S7.Embodiment 2
To diameter 200mm, 304 steel blank of cylinder of high 350mm should use small size extrusion die squeezing passage 6 wide
Degree D is 200mm, and in 200 DEG C of temperature 3 inferior channel pressings severe deformations of progress, concrete operations are as follows:
S1,304 steel blanks 1 are placed into squeezing passage 8, then control extrusion head 4 and squeezes 304 steel blanks 1,
304 steel blanks 1 are deformed in squeezing passage 8, and 304 steel blank, one 5 front end is extruded into 8 corner of squeezing passage；
S2, adjustment extrusion head 4 return to initial position, then start piston-type hydraulic cylinder 1 and radial compression sliding block 3 is driven to squeeze
304 steel blank, one 5,304 steel blank 1 is pressed to deform again, radial dimension reduces；The moving distance of radial compression sliding block 3
It is determined by material yield strength, numerical value is calculated by formula, operating distance formula are as follows:
The formula scope of application is yield strength σsMaterial between 20MPa-400MPa.
For 304 steel, yield strength σsFor 200MPa, by σs=200MPa and D=200mm substitutes into formula and calculates, radial
Extruding sliding block moving distance S is 14.368mm；
After S3, piston-type hydraulic cylinder 1 drive radial compression sliding block 3 to return to initial position, 304 steel blanks 26 are put into, therewith
Extrusion head 4 is compressed axially again, and simultaneously compressive deformation occurs for two blanks, and the middle position of 304 steel blanks 1 is squeezed
It is depressed into 8 corner of squeezing passage；
S4, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and blank 1, blank 26 are radial to deform, and radial dimension reduces；
S5, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, extrusion head 4 is again therewith
It is compressed axially, simultaneously compressive deformation occurs for two blanks, and the terminal position of 304 steel blanks 1 is extruded into squeezing passage 8
Corner；
S6, adjustment extrusion head 4 returns to initial position again, then starts piston-type hydraulic cylinder 1 and drives radial compression sliding
Block 3 implements radial compression to blank 1, blank 26, and 304 steel blanks 1, blank 26 are radial to deform, and radial dimension subtracts
It is small；
S7, make piston-type hydraulic cylinder 1 that radial compression sliding block 3 be driven to return to initial position again, be put into 304 steel blanks three,
Extrusion head 4 is compressed axially again therewith, and simultaneously compressive deformation occurs for three blanks, and 304 steel blanks 1 are smoothly squeezed out
8 turning of squeezing passage, 26 front end of blank enter 8 turning of squeezing passage, so far complete a circulation.
S8, it is put into the 4th block of blank, repeats step S1 to step S7.
The present invention provides channel pressings mold and its application methods such as a kind of axial-radial alternative expression, passes through extrusion head axis
To movement and piston-type hydraulic cylinder drive radial compression sliding block along slider guide T-slot radial motion alternately so that base
Material is subjected to multiple radial compression deformation while generating acutely shear-deformable, improves the deformation extent of blank, enhances it
Grain refining effect.The more appearance that blank can be made to flow in squeezing passage corner by the effect of radial compression sliding block simultaneously
Easily, the load burden for reducing pressure head, can be improved die life, have important practical usage and application value.
The example of present embodiment is preferred embodiments of the invention, not limits protection model of the invention according to this
Enclose, therefore: the equivalence changes that all structures under this invention, shape, principle etc. are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (3)
1. channel pressings molds such as a kind of axial-radial alternative expressions, it is characterised in that: sliding including Extruding die (7) and radial compression
Block (3) is provided with squeezing passage (8) in the Extruding die (7), the turning of squeezing passage (8) the setting arc-shaped, described to squeeze
It is provided with the extrusion head (4) that can be moved up and down at pressure passageway (8) upper end opening, the extrusion head (4) and squeezing passage (8)
Cross-sectional sizes match；The Extruding die (7) also sets up with squeezing passage (7) in the disconnected slider guide T of corner
Type groove (9), the slider guide T-slot (9) are that radial compression sliding block (3) provide guide function, the radial compression sliding block (3)
Can be movable in the slider guide T-slot (9) of Extruding die (7), the radial compression sliding block (3) is fixedly connected with stretching and squeezes
The other end of the piston rod (2) of cavity plate (7), the piston rod (2) is connected with piston-type hydraulic cylinder (1), the piston hydraulic
Cylinder (1) can drive radial compression sliding block (3) to be moved along the guiding of slider guide T-slot (9) by piston rod (2).
2. a kind of application method of the channel pressings molds such as axial-radial alternative expression, which comprises the following steps:
S1, blank one is placed in squeezing passage (8), then controls extrusion head (4) axial compression blank one (5), blank
One (5) are deformed in squeezing passage (8), and blank one (5) front end is extruded into squeezing passage (8) corner；
S2, adjustment extrusion head (4) return to initial position, then start piston-type hydraulic cylinder (1) and drive radial compression sliding block (3)
Radial compression is implemented to blank one (5), blank one (5) radially deforms, and radial dimension reduces；
After S3, piston-type hydraulic cylinder (1) driving radial compression sliding block (3) return to initial position, it is put into blank two (6), is squeezed therewith
Pressure pressure head (4) is compressed axially again, blank one (5) and blank two (6) while compressive deformation occurs, in blank one (5)
Between position be extruded into squeezing passage (8) corner；
S4, adjustment extrusion head (8) returns to initial position again, then starts piston-type hydraulic cylinder (1) and drives radial compression sliding
Block (3) implements radial compression to blank one (5) and blank two (6), and blank one (5) and blank two (6) radially deform, radial
Size reduces；
S5, piston-type hydraulic cylinder (1) driving radial compression sliding block (3) is made to return to initial position again, extrusion head (4) is again therewith
Secondary to be compressed axially, simultaneously compressive deformation occurs for blank one (5) and blank two (6), and the terminal position of blank one (5) is extruded
To squeezing passage (8) corner；
S6, adjustment extrusion head (4) returns to initial position again, then starts piston-type hydraulic cylinder (1) and drives radial compression sliding
Block (3) implements radial compression to blank one (5) and blank two (6), and blank one (5) and blank two (6) radially deform, radial
Size reduces；
S7, so that piston-type hydraulic cylinder (1) driving radial compression sliding block (3) is returned to initial position again, be put into blank three, squeeze therewith
Pressure pressure head (4) is compressed axially again, and compressive deformation occurs simultaneously for three blanks, and blank one (5) is squeezed logical by smooth extrusion
Road (8) turning, blank two (6) front end enter squeezing passage (8) turning, so far complete a circulation；
S8, it is put into the 4th block of blank, repeats step S1 to step S7.
3. a kind of application method of the channel pressings molds such as axial-radial alternative expression according to claim 2, feature exist
Determined in: the operating distance S of radial compression sliding block (3) the single radial compression by material yield strength, numerical value by with
Lower formula calculates:
In formula, operating distance S unit is mm；σsFor the yield strength of material；D is squeezing passage diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910717997.5A CN110369541B (en) | 2019-08-05 | 2019-08-05 | Axial and radial alternating equal-channel extrusion die and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910717997.5A CN110369541B (en) | 2019-08-05 | 2019-08-05 | Axial and radial alternating equal-channel extrusion die and using method thereof |
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| Publication Number | Publication Date |
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| CN110369541A true CN110369541A (en) | 2019-10-25 |
| CN110369541B CN110369541B (en) | 2020-06-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001001042A (en) * | 1999-06-16 | 2001-01-09 | Akamatsu Forsys Kk | Die for micro-crystallizing grain size |
| CN1718810A (en) * | 2005-07-13 | 2006-01-11 | 哈尔滨工业大学 | Method and device for preparing magnesium alloy semi solid state blank |
| US20090243164A1 (en) * | 2008-04-01 | 2009-10-01 | Los Alamos National Security, Llc | Preparation of a dense, polycrystalline ceramic structure |
| CN101954389B (en) * | 2010-09-16 | 2012-08-29 | 浙江天兴管业有限公司 | Metal elbow cold extrusion molding device |
| CN104438415A (en) * | 2014-11-24 | 2015-03-25 | 徐州工程学院 | Multi-directional composite multi-channel screw extrusion die for metal blank |
-
2019
- 2019-08-05 CN CN201910717997.5A patent/CN110369541B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001001042A (en) * | 1999-06-16 | 2001-01-09 | Akamatsu Forsys Kk | Die for micro-crystallizing grain size |
| CN1718810A (en) * | 2005-07-13 | 2006-01-11 | 哈尔滨工业大学 | Method and device for preparing magnesium alloy semi solid state blank |
| US20090243164A1 (en) * | 2008-04-01 | 2009-10-01 | Los Alamos National Security, Llc | Preparation of a dense, polycrystalline ceramic structure |
| CN101954389B (en) * | 2010-09-16 | 2012-08-29 | 浙江天兴管业有限公司 | Metal elbow cold extrusion molding device |
| CN104438415A (en) * | 2014-11-24 | 2015-03-25 | 徐州工程学院 | Multi-directional composite multi-channel screw extrusion die for metal blank |
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| Publication number | Publication date |
|---|---|
| CN110369541B (en) | 2020-06-23 |
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