CN105436228B - Two-way continuous confined strip shearing device and method - Google Patents
Two-way continuous confined strip shearing device and method Download PDFInfo
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- CN105436228B CN105436228B CN201510924529.7A CN201510924529A CN105436228B CN 105436228 B CN105436228 B CN 105436228B CN 201510924529 A CN201510924529 A CN 201510924529A CN 105436228 B CN105436228 B CN 105436228B
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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
- B21C23/21—Presses specially adapted for extruding metal
- B21C23/217—Tube extrusion presses
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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
- B21C23/21—Presses specially adapted for extruding metal
- B21C23/212—Details
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- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a kind of two-way continuous confined strip shearing device, including axially hollow variable cross-section annular extrusion cylinder, variable cross-section core bar, upper fixed platen, lower fixed platen, upper annular extrusion drift, lower annular extrusion drift and torsional mode workbench；Wherein, the upper fixed platen of upper end connection of variable cross-section annular extrusion cylinder, the lower fixed platen of lower end connection；Set fluted on the internal face of variable cross-section annular extrusion cylinder；Variable cross-section core bar is arranged on the inner side of variable cross-section annular extrusion cylinder；Variable cross-section core bar is provided with the projection with groove match；Upper annular extrusion drift connects the upper end of variable cross-section core bar through the first through hole of upper fixed platen；Lower annular extrusion drift connects the lower end of variable cross-section core bar through the second through hole of lower fixed platen；Lower fixed platen is arranged on torsional mode workbench.Necking down area during the present invention extrudes conventional reciprocating is changed into the continuous shear stress passage seamlessly transitted, improves shearing uniformity of the tube-shaped parison in cross-sectional direction.
Description
Technical field
The present invention relates to plastic forming technology, in particular it relates to a kind of two-way continuous confined strip shearing device and method.
Background technology
Super fine crystal material is to integrate excellent intensity and the high performance material of good plasticity and toughness.And large plastometric set
Technology (SPD) has significant grain refining capability, be it is a kind of it is generally acknowledged prepare Ultra-fine Grained (grain size is 100nm-1um) and
Block nanometer (crystal grain is less than 100nm) most promising method of material.
By the literature search discovery to prior art, Publication No. CN103894436A Chinese invention patent, invention
Title：A kind of to strengthen the reciprocating extrusion device and processing method of magnesium-alloy tube, the technology is closed by the reciprocating extruding of ring-type to magnesium
Golden pipe carries out multi-pass processing, realizes the continuous modification of " magnesium-alloy tube --- magnesium alloy block --- magnesium-alloy tube ", prepares crystalline substance
Tiny, even tissue the magnesium-alloy tube of grain.But the device and processing method are in actual applications, with " pipe " " block " alternately
Conversion, constantly has the metal surface of cleaning exposed and stain surfaces convolution, causes obtained tubing to there is obvious tissue
Defect；Meanwhile, the actually tubular construction of tubing made from this method after reciprocating extrusion deformation terminates, generally requires follow-up machine and added
Work, is tubular-shaped structures by tubular construction secondary operation, therefore, and tube billet consume is serious, and production efficiency is low.
Further retrieval is found, L.S.Toth et al. exists《Scripta Materialia》, 2009,60:Sent out on 175-177
" Severe plastic deformation of metals by high-pressure tube the twisting " (height of table
Pressure-pipe type reverses large plastometric set) in a text, it is proposed that for preparing Ultra-fine Grained, the high pressure tubular of even nanocrystalline tubing reverses
Device.The device utilizes the elastic expansion that produces after plug axial compression, tube-shaped parison is tightly clipped in recipient and plug it
Between, huge hydrostatic pressure is internally formed in tubing；At the same time, recipient is reversed, occurs tube-shaped parison through-thickness
Continuous shear stress.By the device be used for prepare aluminium alloy pipe, cavity plate only circumferentially rotates 30 °, the crystal grain inside aluminium alloy pipe with
Significantly refined.But along tubing axis a certain degree of shear occurs for almost all of crystal grain, shows ellipse
Shape；Meanwhile, when aluminium alloy pipe outer radius shear strain amount reaches 14, shear strain amount is only 2 at pipe internal diameter, that is, is reversed
The shear strain of generation is extremely uneven along pipe thickness direction.In addition, although the torsional strain can infinitely increase in theory,
But the friction between tube billet and mould limits the increase of torsional strain, a series of above-mentioned shortcomings seriously constrain this method
Application in prepared by the Ultra-fine Grained tubular material of even tissue.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of two-way continuous confined strip shearing device and side
Method.
The two-way continuous confined strip shearing device provided according to one aspect of the invention, including axially hollow variable cross-section annular
Recipient, variable cross-section core bar, upper fixed platen, lower fixed platen, upper annular extrusion drift, lower annular extrusion drift and torsion
Formula workbench；
Wherein, the upper end of the variable cross-section annular extrusion cylinder connects fixed platen, and lower end connects the lower fixation
Platen；
Set fluted on the internal face of the variable cross-section annular extrusion cylinder；The variable cross-section core bar is arranged on described become and cut
The inner side of face ring shape recipient；The variable cross-section core bar is provided with the projection with the groove match；
The first through hole of the upper annular extrusion drift through fixed platen connects the upper of the variable cross-section core bar
End；The lower annular extrusion drift connects the lower end of the variable cross-section core bar through the second through hole of the lower fixed platen；
The lower fixed platen is arranged on the torsional mode workbench, when torsional mode workbench driving is described lower solid
When level pressure disk, variable cross-section annular extrusion cylinder and fixed platen are with the first rotary speed movement, the variable cross-section core bar, institute
State annular extrusion drift and the lower annular extrusion drift is remained stationary as or with the second rotary speed movement, second rotating speed is small
In first rotating speed.
Preferably, the variable cross-section annular extrusion cylinder includes the first semi-circular cylinder and the second semi-circular cylinder；
Wherein, the opening of the first semi-circular cylinder and the second semi-circular cylinder is relative is close to form the change section
Face ring shape recipient；
The upper end of the first semi-circular cylinder and the second semi-circular cylinder fixes upper solid described in pin connection by one
The lower end of level pressure disk, the first semi-circular cylinder and the second semi-circular cylinder passes through lower solid described in another fixed pin connection
Level pressure disk.
Preferably, the center of the upper annular extrusion drift and the lower annular extrusion drift is in through-hole structure；It is described logical
Pore structure and the two ends equal diameters of the variable cross-section core bar.
Preferably, there are the groove of arc transition, the variable cross-section ring at the half high position of the variable cross-section annular extrusion cylinder
The roughened processing of the inner surface of shape recipient；The half high position of the variable cross-section core bar has the circular arc with the groove match
It is raised.
Preferably, on any longitudinal cross-section of the die cavity formed between the variable cross-section annular extrusion cylinder and variable cross-section core bar
For symmetrical combined channel structure；
The combined channel includes the upper linear path sequentially connected, circular arc passage, lower linear path；On described
It is to seamlessly transit between linear path and the circular arc passage and between the lower linear path and the circular arc passage.
The two-way continuous confined strip shearing method that another aspect of the invention is provided, using described two-way continuous confined strip shearing
Device, comprises the following steps：
Step S1, lower fixed platen is fixed on torsional mode workbench, and under two panels semi-circular recipient is fixed on
Annular extrusion cylinder is constituted on fixed platen；Variable cross-section core bar is inserted, tube-shaped parison is put into, upper fixed platen is passed through into variable cross-section
Core bar is fixed on annular extrusion cylinder；It is put into annular extrusion drift, it is ensured that upper annular extrusion drift is contacted with tube-shaped parison, is put
Enter lower annular extrusion drift, and lower annular extrusion drift is risen at the position that lower linear path intersects with circular arc passage；
Step S2, upper annular extrusion drift pressed so that be previously placed in tube-shaped parison in linear path and occur
Crimp, into circular arc passage；
Step S3, when tube-shaped parison head and be previously placed in lower linear path lower annular extrusion punch. contact when,
The extruding force of annular extrusion drift in increase, with annular extrusion drift at present to the reverse application back pressure of tube-shaped parison, opens and reverses
Formula workbench, makes tube-shaped parison occur extruding and torsional deflection, until tube-shaped parison leaves linear path completely, into circle
Arc passage and lower linear path, stop promoting, and complete the processing of the first passage；
Annular extrusion drift, lower annular extrusion drift on step S4, reverse drive, while reversing two-way continuous confined strip shearing
Device makes tube-shaped parison twist deformation, until tube-shaped parison leaves lower linear path completely, into circular arc passage and upper
Linear path, stops promoting, and completes the processing of the second passage.
Preferably, also comprise the following steps：
- repeat step S2~step S3, realizes the two-way continuous confined strip shearing of multi-pass.
Preferably, in step S3 or step S4, also comprise the following steps：
When tube-shaped parison is moved with the up or down row of upper annular extrusion drift and lower annular extrusion drift, circle is continued through
The die cavity of arc, occurs continuous shear stress along its cross-sectional direction；
The variable cross-section annular extrusion cylinder handled through surface roughening drives tubular in twist motion under frictional force effect
The external diameter of blank carries out circumferential movement with the first rotating speed, and the internal diameter of tube-shaped parison is contacted with variable cross-section core bar, is not occurred or is sent out
The circumferential movement of raw second rotating speed so that along pipe thickness direction continuous shear stress occurs for tube-shaped parison；
Second rotating speed is less than first rotating speed.
Preferably, when tubing to be processed is not suitable for or can not carry out normal temperature processing, tube-shaped parison and two-way continuous shear stress
Deformation device can carry out In Situ Heating by heating mantle.
Preferably, the pressure for acting on the upstream or downstream of variable cross-section core bar is：40t~1000t, extrusion speed is
0.1mm/s~10mm/s；
The pressure of the back pressure is：400MPa~10GPa；
The circumferential spinning rate of the torsional mode workbench is 0.1rpm~10rpm, and the windup-degree scope of application is 30 °
~360 °.
The described two-way continuous confined strip shearing device that another aspect of the present invention is provided is between simple metal, alloy, metal
Compound, composite, the Ultra-fine Grained tubular material of macromolecular material or semi-conducting material prepare in purposes.
Compared with prior art, the present invention has following beneficial effect：
1st, the necking down area during the present invention extrudes conventional reciprocating is changed into the continuous shear stress passage seamlessly transitted, improves pipe
Shearing uniformity of the shape blank in cross-sectional direction；
2nd, the reciprocating extrusion that uses of the present invention causes tube-shaped parison multipass circular arc-shaped corner passage, effective refinement matrix
Crystal grain, while reducing the size dispersity of matrix grain, improves structural homogenity；
3rd, the present invention make it that tube-shaped parison occurs continuously to cut along pipe thickness direction by the axial torsion of annular extrusion cylinder
Cut, further increase the degree of crystal grain refinement.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the semi-section structural representation of two-way continuous confined strip shearing mould in the present invention；
Fig. 2 is the circular arc passage die cavity schematic diagram of recipient and core bar formation；
In figure：
1st, upper annular extrusion drift；
2nd, upper fixed platen；
3rd, variable cross-section annular extrusion cylinder；
4th, fixing nut；
5th, lower fixed platen；
6th, torsional mode workbench；
7th, variable cross-section core bar；
8th, steady pin；
9th, tube-shaped parison；
10th, die cavity；
11st, standing screw；
12nd, pad；
13rd, lower annular extrusion drift.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
In the present embodiment, the two-way continuous confined strip shearing device that the present invention is provided, including axially hollow variable cross-section ring
Shape recipient 3, variable cross-section core bar 7, upper fixed platen 2, lower fixed platen 5, upper annular extrusion drift 1, lower annular extrusion drift
13 and torsional mode workbench 6；
Wherein, the upper end of the variable cross-section annular extrusion cylinder 3 connects fixed platen 2, and lower end connection is described lower solid
Level pressure disk 5；Set fluted on the internal face of the variable cross-section annular extrusion cylinder 3；The variable cross-section core bar 7 is arranged on the change
The inner side of cross sectional annular recipient 3；The variable cross-section core bar 7 is provided with the projection with the groove match；
The first through hole of the upper annular extrusion drift 1 through fixed platen 2 connects the variable cross-section core bar 7
Upper end；The lower annular extrusion drift 13 is connected under the variable cross-section core bar 7 through the second through hole of the lower fixed platen 5
End；
The lower fixed platen 5 is arranged on the torsional mode workbench 6, when the torsional mode workbench 6 drive it is described
When lower fixed platen 5, variable cross-section annular extrusion cylinder 3 and fixed platen 2 are with the first rotary speed movement, the variable cross-section
Core bar 7, the upper annular extrusion drift 1 and the lower annular extrusion drift 13 are remained stationary as or with the second rotary speed movement, institute
The second rotating speed is stated less than first rotating speed.
The variable cross-section annular extrusion cylinder 3 includes the first semi-circular cylinder and the second semi-circular cylinder；Wherein, described first
The opening of semi-circular cylinder and the second semi-circular cylinder is relative to be close to form the variable cross-section annular extrusion cylinder 3；
The upper end of the first semi-circular cylinder and the second semi-circular cylinder connects described solid by a steady pin 8
The lower end of level pressure disk 2, the first semi-circular cylinder and the second semi-circular cylinder by another steady pin 8 connect it is described under
Fixed platen 5.
The center of the upper annular extrusion drift 1 and the lower annular extrusion drift is in through-hole structure；The through-hole structure
With the two ends equal diameters of the variable cross-section core bar 7.There is arc transition at the half high position of the variable cross-section annular extrusion cylinder 3
Groove, the roughened processing of inner surface of the variable cross-section annular extrusion cylinder 3；The half high position of the variable cross-section core bar 7 have with
The circular arc of the groove match is raised.
The die cavity 10 formed between the variable cross-section annular extrusion cylinder 3 and variable cross-section core bar 7 is on its any longitudinal cross-section
For symmetrical combined channel structure；The combined channel include sequentially connect upper linear path, circular arc passage,
Lower linear path；The upper linear path and the circular arc passage and the lower linear path and the circular arc passage
Between to seamlessly transit.
The two-way continuous confined strip shearing method based on the two-way continuous confined strip shearing device that the present invention is provided, including such as
Lower step：
Lower fixed platen 5 is fixed on torsional mode workbench 6 first, and two panels semi-circular recipient is fixed on lower solid
Annular extrusion cylinder 3 of the internal diameter for 50mm is constituted on level pressure disk 5；Insert variable cross-section core bar 7, the specific size of the variable cross-section core bar
For：End diameter 30mm, a diameter of 50mm in variable cross-section maximum cross-section；It is put into aluminium alloy pipe blank 9, the specific geometry of the blank
Size is：External diameter 50mm, wall thickness 10mm, length 120mm；Upper fixed platen 2 is fixed on annular extrusion through variable cross-section core bar
On cylinder 3；It is put into annular extrusion drift 1, it is ensured that upper annular extrusion drift 1 is contacted with blank 8, is put into lower annular extrusion drift
13, and risen at the position that the linear of die cavity 10 intersects with circular arc passage；Apply 100t pressures to upper annular extrusion drift 1
Power, brings it about 3mm/s downward movement, while extruding is previously placed in the blank 9 in linear path, it is logical into circular arc
Road.When being contacted on the head of blank 9 with the lower annular extrusion drift 13 being previously placed in lower linear path, annular pressure head in increase
Pressure applies 600MPa back pressures with annular extrusion drift at present to 300t to blank 9, opens torsional mode workbench 6 and occurs 1r/
Min is circumferentially reversed, and is made tube-shaped parison 9 while occurring extruding and torsional deflection, until blank leaves linear path completely, is entered
Enter circular arc and lower linear path, stop promoting, complete the processing of the first passage.Annular extrusion drift, lower annular in reverse drive
Drift is extruded, while torsion module makes tube-shaped parison 9 twist deformation, up to blank leaves lower linear path completely, is entered
Enter circular arc and upper linear path, stop promoting, complete the processing of the second passage；Repeat the above steps, realize multi-pass torsional mode
Reciprocating extrusion is deformed.After process finishing, fixed platen 2 in annular extrusion drift, lower annular extrusion drift, opening, tears open in taking-up
Annular extrusion cylinder 3 is unloaded, tube billet 9 and variable cross-section core bar 7, thorough cleaning mould, while coating die care agent is taken out.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substance of the present invention.
Claims (10)
1. a kind of two-way continuous confined strip shearing device, it is characterised in that including axially hollow variable cross-section annular extrusion cylinder, become and cut
Face core bar, upper fixed platen, lower fixed platen, upper annular extrusion drift, lower annular extrusion drift and torsional mode workbench；
Wherein, the upper end of the variable cross-section annular extrusion cylinder connects fixed platen, and lower end connects the lower fixed platen；
Set fluted on the internal face of the variable cross-section annular extrusion cylinder；The variable cross-section core bar is arranged on the variable cross-section ring
The inner side of shape recipient；The variable cross-section core bar is provided with the projection with the groove match；
The first through hole of the upper annular extrusion drift through fixed platen connects the upper end of the variable cross-section core bar；Institute
State the lower end that lower annular extrusion drift connects the variable cross-section core bar through the second through hole of the lower fixed platen；
The lower fixed platen is arranged on the torsional mode workbench, when the torsional mode workbench driving lower fixed pressure
Disk, the variable cross-section annular extrusion cylinder and fixed platen with the first rotary speed movement when, the variable cross-section core bar, it is described on
Annular extrusion drift and the lower annular extrusion drift are remained stationary as or with the second rotary speed movement, and second rotating speed is less than institute
State the first rotating speed.
2. two-way continuous confined strip shearing device according to claim 1, it is characterised in that the variable cross-section annular extrusion cylinder
Including the first semi-circular cylinder and the second semi-circular cylinder；
Wherein, the opening of the first semi-circular cylinder and the second semi-circular cylinder is relative is close to form the variable cross-section ring
Shape recipient；
The fixed pressure of pin connection is fixed in the upper end of the first semi-circular cylinder and the second semi-circular cylinder by one
The lower end of disk, the first semi-circular cylinder and the second semi-circular cylinder passes through lower fixed pressure described in another fixed pin connection
Disk.
3. two-way continuous confined strip shearing device according to claim 1, it is characterised in that the upper annular extrusion drift and
The center of the lower annular extrusion drift is in through-hole structure；The two ends diameter phase of the through-hole structure and the variable cross-section core bar
Deng.
4. two-way continuous confined strip shearing device according to claim 1, it is characterised in that the variable cross-section annular extrusion cylinder
Half high position at have the groove of arc transition, the roughened processing of inner surface of the variable cross-section annular extrusion cylinder；It is described to become
The half high position of section core bar has the circular arc projection with the groove match.
5. two-way continuous confined strip shearing device according to claim 1, it is characterised in that the variable cross-section annular extrusion cylinder
It is symmetrical combined channel structure on any longitudinal cross-section of the die cavity formed between variable cross-section core bar；
The combined channel includes the upper linear path sequentially connected, circular arc passage, lower linear path；The upper straight line
It is to seamlessly transit between shape passage and the circular arc passage and between the lower linear path and the circular arc passage.
6. a kind of two-way continuous confined strip shearing method, it is characterised in that using the two-way company described in any one of claim 1 to 5
Continuous detrusion device, comprises the following steps：
Step S1, lower fixed platen is fixed on torsional mode workbench, and two panels semi-circular recipient is fixed on lower fixation
Annular extrusion cylinder is constituted on platen；Variable cross-section core bar is inserted, tube-shaped parison is put into, upper fixed platen is passed through into variable cross-section core bar
It is fixed on annular extrusion cylinder；It is put into annular extrusion drift, it is ensured that upper annular extrusion drift is contacted with tube-shaped parison, is put into down
Annular extrusion drift, and lower annular extrusion drift is risen at the position that lower linear path intersects with circular arc passage；
Step S2, to upper annular extrusion drift press so that the tube-shaped parison being previously placed in linear path is extruded
Deformation, into circular arc passage；
Step S3, when tube-shaped parison head and be previously placed in lower linear path lower annular extrusion punch. contact when, increase
The extruding force of upper annular extrusion drift, with annular extrusion drift at present to the reverse application back pressure of tube-shaped parison, opens torsional mode work
Make platform, tube-shaped parison is occurred extruding and torsional deflection, until tube-shaped parison leaves linear path completely, it is logical into circular arc
Road and lower linear path, stop promoting, and complete the processing of the first passage；
Annular extrusion drift, lower annular extrusion drift on step S4, reverse drive, while reversing two-way continuous confined strip shearing device
Tube-shaped parison is set to twist deformation, until tube-shaped parison leaves lower linear path completely, into circular arc passage and upper straight line
Shape passage, stops promoting, and completes the processing of the second passage.
7. two-way continuous confined strip shearing method according to claim 6, it is characterised in that also comprise the following steps：
- repeat step S2~step S3, realizes the two-way continuous confined strip shearing of multi-pass.
8. two-way continuous confined strip shearing method according to claim 6, it is characterised in that in step S3 or step S4,
Also comprise the following steps：
When tube-shaped parison is moved with the up or down row of upper annular extrusion drift and lower annular extrusion drift, circular arc is continued through
Die cavity, along its cross-sectional direction occur continuous shear stress；
The variable cross-section annular extrusion cylinder handled through surface roughening drives tube-shaped parison in twist motion under frictional force effect
External diameter circumferential movement is carried out with the first rotating speed, and the internal diameter of tube-shaped parison is contacted with variable cross-section core bar, does not occur or occur the
The circumferential movement of two rotating speeds so that along pipe thickness direction continuous shear stress occurs for tube-shaped parison；
Second rotating speed is less than first rotating speed.
9. two-way continuous confined strip shearing method according to claim 6, it is characterised in that be not suitable for when tubing to be processed or
When can not carry out normal temperature processing, tube-shaped parison and two-way continuous confined strip shearing device can carry out In Situ Heating by heating mantle.
10. the two-way continuous confined strip shearing device described in a kind of any one of claim 1 to 5 is changed between simple metal, alloy, metal
Compound, composite, the Ultra-fine Grained tubular material of macromolecular material or semi-conducting material prepare in purposes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510924529.7A CN105436228B (en) | 2015-12-11 | 2015-12-11 | Two-way continuous confined strip shearing device and method |
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| CN201510924529.7A CN105436228B (en) | 2015-12-11 | 2015-12-11 | Two-way continuous confined strip shearing device and method |
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| CN105436228B true CN105436228B (en) | 2017-07-11 |
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| CN108169036B (en) * | 2017-11-27 | 2020-12-08 | 西北工业大学 | Mechanical type sheet metal bidirectional shearing device |
| CN109127754B (en) * | 2018-08-29 | 2020-08-18 | 重庆大学 | Preparation method of superfine crystal magnesium alloy extruded bar |
| CN109365560A (en) * | 2018-11-14 | 2019-02-22 | 江苏科技大学 | A kind of rotation backward extrusion apparatus and method preparing Ultra-fine Grained cup shell |
| CN111889528B (en) * | 2019-05-05 | 2021-06-29 | 上海交通大学 | Secondary torsion extrusion device and method for variable cross-section cavity of refined crystal grains |
| CN110153211B (en) * | 2019-05-28 | 2020-10-27 | 西北工业大学 | Preparation device and forming method of ultrafine-grained and nanocrystalline blank |
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| JP4788874B2 (en) * | 2005-04-14 | 2011-10-05 | 独立行政法人物質・材料研究機構 | Strong processing method for metal materials and molds used for strong processing method |
| TWI353275B (en) * | 2008-12-03 | 2011-12-01 | Metal Ind Res & Dev Ct | Apparatus for forming spiral extrusion |
| CN101966536B (en) * | 2010-09-22 | 2012-08-22 | 上海交通大学 | Torsion type reciprocating extrusion device and process method thereof |
| CN104307908B (en) * | 2014-10-09 | 2016-04-27 | 太原理工大学 | A kind of method waiting channel formation mould and shaping pipe thereof of thick-wall tube |
| CN104475475B (en) * | 2014-11-28 | 2016-03-23 | 太原理工大学 | One turns round crowded shaping dies and manufacturing process |
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