CN208213965U - A kind of hot extrusion molding die with equal channel angular - Google Patents
A kind of hot extrusion molding die with equal channel angular Download PDFInfo
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- CN208213965U CN208213965U CN201820775979.3U CN201820775979U CN208213965U CN 208213965 U CN208213965 U CN 208213965U CN 201820775979 U CN201820775979 U CN 201820775979U CN 208213965 U CN208213965 U CN 208213965U
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- hot extrusion
- channel angular
- equal channel
- discharge port
- molding die
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- 238000001192 hot extrusion Methods 0.000 title claims abstract description 62
- 238000000465 moulding Methods 0.000 title claims abstract description 30
- 238000001125 extrusion Methods 0.000 claims abstract description 59
- 230000006835 compression Effects 0.000 claims description 14
- 238000007906 compression Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 17
- 239000002184 metal Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 11
- 230000003340 mental effect Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a kind of hot extrusion molding die with equal channel angular, belongs to technical field of mold.Split type extrusion internal model is connected to shape forming cavity with divisible forming tool in mold, and divisible forming tool includes feeding inlet, squeezes out discharge port, equal channel angular and total discharge port；There are semidiameters with interior model cavity for divisible forming tool type chamber, and the two molds can opening and closing left and right, in extrusion process, divisible forming tool is fixed and is constrained by external mold sleeve with internal model.The mold combines variable diameter than two kinds of large plastometric set methods of hot extrusion and equal channel angular, vertical extruder can be not only efficiently solved in process of production squeezes out the limitation that distance receives press depth, and the metal squeezed out by variable diameter is plastically deformed again by equal channel angular, achieve the effect that further to refine crystal grain, the structure and performance of the mental section of acquisition will be more preferable.
Description
Technical field
The utility model relates to technical field of mold, more specifically to a kind of hot extrusion with equal channel angular
Molding die.
Background technique
The forming method that alloy squeezes out profile at present is often to pass through pressure ram for being placed in extrusion die after METAL HEATING PROCESS
Metal is squeezed into mold, the extrusion type chamber that metal is changed by sectional area is shaped to section under the influence of high pressure and temperature
The smaller bar of product or plate.But when carrying out hot extrusion molding on vertical extruder, the length of profile is squeezed out by mold
The limitation of distance between ground, and mold usually needs to raise and make lower section hanging in use, and this to produce
There is higher risk in the process, while the mechanical property of the mental section of hot extrusion in different directions can be in the presence of certain poor
It is different, therefore there is biggish rooms for improvement for hot extrusion mold at this stage.
Summary of the invention
The purpose of the utility model is to overcome mental sections in existing Vertical Heat extruding technology to form length limited system, with
And each mechanical property of profiles the problem of differing greatly, a kind of hot extrusion molding die with equal channel angular is provided.
In order to achieve the above object, the utility model is achieved by following technical proposals:
A kind of hot extrusion molding die with equal channel angular comprising external mold sleeve, split type extrusion internal model, fission
Formula molding die；The split type extrusion internal model is in hollow circuit cylinder tubular, and inside is tubular type chamber；Compression bar is squeezed out to match with gap
The tubular type that conjunction mode is set to split type extrusion internal model is intracavitary, and the two constitutes plunger pair；Divisible forming tool is by cylindrical body
Portion and protruding portion composition, the protruding portion is set on the side wall in cylindrical body portion, the split type extrusion internal model coaxial placement in
Above the cylindrical body portion and the outer diameter of the two is identical；Feeding inlet is offered at the top of the cylindrical body portion, feeding inlet bottom is just
To hot extrusion discharge port, the protruding portion side wall offers total discharge port for exporting profile, hot extrusion discharge port and total
It is connected between discharge port by the equal channel angular type chamber with corner bend；The tubular type chamber, feeding inlet, hot extrusion go out
Material mouth, equal channel angular type chamber are sequentially connected to total discharge port, constitute hot extrusion forming recess；The split type extrusion internal model
It is spliced with divisible forming tool by the two halves of mirror symmetry, enables the hot extrusion forming recess to half-open
It closes；The external mold sleeve is in hollow circuit cylinder tubular, and its bottom offers and the matched notch of the protruding portion, external mold sleeve
Be sheathed on outside split type extrusion internal model and divisible forming tool with gap fiting mode, with limit split type extrusion internal model and
The folding of divisible forming tool.
Preferably, the external mold sleeve height be equal to it is split type extrusion internal model and divisible forming tool height it
With top is concordant with split type extrusion internal model top, and bottom is concordant with divisible forming tool bottom；External mold sleeve bottom
Notch is stuck in the protruding portion upper surface.
Preferably, the hot extrusion discharge port, equal channel angular type chamber and total discharge port three cross sectional shape and
Size is consistent, so that squeezing out metal surrounding uniform force, facilitates lasting discharging.
Preferably, the hot extrusion in the tubular type chamber of the split type extrusion internal model and divisible forming tool discharges
The ratio between cross-sectional area of mouth is 4~400:1, and actual angle can be chosen as needed.
Preferably, the corner bend angle in the equal channel angular type chamber is 90 °~150 °, actual angle can root
According to being chosen.
Preferably, the cross-sectional shape of the hot extrusion discharge port, equal channel angular type chamber and total discharge port is circle
Shape, rectangular or polygon can make profile of different shapes also according to product needs.
Preferably, cylindrical body portion and protruding portion are integrally formed, in the divisible forming tool in order to process.
Preferably, protruding portion is in arched door shape in the divisible forming tool.
Preferably, the feeding inlet is in inverted round table shape, internal diameter is gradually reduced from top to bottom, so that metal is formed in
It is extruded together herein.
Preferably, the extrusion compression bar connects with the pressure head of hydraulic press, metal mold is pushed using the pressure of hydraulic press
The extrusion molding of material.
Compared with prior art, the utility model have the following advantages that with the utility model has the advantages that
1, by the way that hot extrusion to be connected to equal channel angular type chamber, extrusion type material production process is carried out on vertical extruder
In, so that the extrusion angle for squeezing out mental section along vertical direction originally is changed, it is long that section bar extrusion can be effectively avoided
Degree is limited by distance between mold and ground, plays the role of reducing number of operations, this outer mold is also born than original
Bigger inlet amount, to increase the extrusion length of profile；
2, when the mental section of hot extrusion directly passes through equal channel angular type chamber, secondary operation can be carried out, makes to refine crystal grain
Shape and be distributed it is more uniform, avoid recrystal grain after profile hot extrusion grow up with different directions mechanical property exist it is poor
Different problem.
3, during carrying out direct/indirect thermal extrusion molding for alloy crumble or particle, the metal mold of hot extrusion
Material directly passes through equal channel angular type chamber and carries out secondary operation, can also play the role of soldering again, promotes aluminium skimmings or particle
Between interface metallurgical bonding, the extruded product for avoiding such raw material from occur in profile production process due to interface cohesion not
Generation that is good and leading to unqualified profile.
Detailed description of the invention
Fig. 1 is the cross-sectional view after the utility model integrally assembles.
Fig. 2 is that the utility model integrally assembles the perspective view after (no compression bar).
Fig. 3 is that the utility model integrally assembles the top view after (no compression bar).
Description of symbols: external mold sleeve 1, divisible forming tool 3, interior model cavity 4, always goes out split type extrusion internal model 2
Material mouth 5, feeding inlet 7, squeezes out compression bar 8, squeezes out discharge port 9 equal channel angular type chamber 6.
Specific embodiment
The present invention is further illustrated below according to attached drawing, embodiment and comparative example.
Embodiment 1
As shown in Figure 1, be a kind of hot extrusion molding die with equal channel angular, including external mold sleeve 1, it is split type squeeze
Internal model 2, divisible forming tool 3 out.Split type extrusion internal model 2 is in hollow circuit cylinder tubular, and inside is tubular type chamber.Squeeze out compression bar
8 with gap fiting mode be set to it is split type squeeze out internal model 2 tubular type it is intracavitary, the two constitute plunger pair.Squeeze out compression bar 8 and liquid
The pressure head of press connects, and is pressed down against under the action of pressure head, provides the power of material extrusion.Divisible forming tool 3 is by justifying
Trunk portion and protruding portion composition, protruding portion are in arched door shape, are made of, are close to the semicylinder of top and the cuboid of lower section
In on the side wall in cylindrical body portion, cylindrical body portion and protruding portion are integrally formed.Split type 2 coaxial placement of extrusion internal model is in cylindrical body portion
Top, split type extrusion internal model 2 are identical as the outer diameter in cylindrical body portion.Feeding inlet 7, feeding inlet 7 are offered at the top of cylindrical body portion
In inverted round table shape, internal diameter is gradually reduced from top to bottom.7 bottom face hot extrusion discharge port 9 of feeding inlet.Protruding portion side wall opens up
There is total discharge port 5 for output type material, passes through 6 phase of equal channel angular type chamber between hot extrusion discharge port 9 and total discharge port 5
Even.The L-shaped three stage structure of equal channel angular type chamber 6 is followed successively by vertical section section, corner bend section and traversing section, vertical
Section connection hot extrusion discharge port 9, traversing section connect total discharge port 5.In the present embodiment, hot extrusion discharge port 9, equal channel angular
Type chamber 6 and total discharge port 5 can be integrally formed.The section of hot extrusion discharge port 9, equal channel angular type chamber 6 and 5 three of total discharge port
Shape and size are consistent, so that squeezing out metal surrounding uniform force, facilitate lasting discharging.Hot extrusion discharge port section
Model cavity sectional area ratio, corner bend angle are all in accordance with product needs and metal flow difficulty or ease situation in long-pending and split type extrusion
Different sizes is taken, in general hot extrusion discharge port sectional area gets over model cavity sectional area ratio in split type extrusion
Greatly, corner bend angle should also be as bigger.In the present embodiment, the split type tubular type chamber and split type shaping mould for squeezing out internal model 2
The ratio between cross-sectional area of hot extrusion discharge port 9 in tool 3 is 16:1, and the corner bend angle in equal channel angular type chamber 6 is 90.
Tubular type chamber, feeding inlet 7, hot extrusion discharge port 9, equal channel angular type chamber 6 are sequentially connected to total discharge port 5, structure
At hot extrusion forming recess, mental section is squeezed into feeding inlet 7 under the pressure for squeezing out compression bar 8 from tubular type chamber, is then led to
After crossing hot extrusion discharge port 9, it is diverted into equal channel angular type chamber 6 while carries out secondary operation in steering procedure, finally
It is exported from total discharge port 5.Hot extrusion discharge port 9,6 and of equal channel angular type chamber in the present embodiment, in divisible forming tool 3
The cross-sectional shape of total discharge port 5 is circle, and the product of formation is pole.
Above-mentioned hot extrusion molding die can form metal and carry out hot extrusion molding, and carry out on vertical extruder
It squeezes out in profile production process, the extrusion angle for squeezing out mental section along vertical direction originally is made to change, it can be effective
Ground avoids section bar extrusion length by the limitation of distance between mold and ground.But in use, due to various chamber itself
With certain receiving volume, therefore at the end of extrusion process, still there is part profile that can retain in cavity.Therefore, originally
Hot extrusion molding die is designed as opening and closing type, specific structure in invention are as follows:
As shown in Figures 2 and 3, split type extrusion internal model 2 and divisible forming tool 3 are both designed as by symmetrical two halfbodies
It is spliced, two halfbodies of each mold are to pass through the vertical guide of central axes as center face mirror symmetry.Split type extrusion
Formation tubular type chamber after two halfbodies splicing of internal model 2, two halfbodies splicing of divisible forming tool 3 and formation feeding inlet 7,
Hot extrusion discharge port 9, equal channel angular type chamber 6 and total discharge port 5, thus entire hot extrusion forming recess can be to half-open
It closes, internal forming metal is removed.The manufacturing method of halfbody carries out cutting processing after being integrally formed split mold again
It forms, can also manufacture respectively.Due to only being spliced between halfbody, restraining force is not present, it is therefore desirable to outer die casing cylinder 1
It is sheathed on periphery, realizes radial constraint.External mold sleeve 1 is in hollow circuit cylinder tubular, and external mold sleeve is sheathed on gap fiting mode
Outside split type extrusion internal model 2 and divisible forming tool 3, to limit split type extrusion internal model 2 and divisible forming tool 3
Folding.And 1 bottom of external mold sleeve offers and the matched arched door v notch v of protruding portion.1 height of external mold sleeve is equal to split type squeeze
The sum of internal model 2 and the height of divisible forming tool 3 out, when it, which is in, is arranged state, top and split type extrusion internal model 2
Top is concordant, and bottom is concordant with 3 bottom of divisible forming tool, and the notch of 1 bottom of external mold sleeve is just stuck in table on protruding portion
Face.Under the rigid constraint of outer die casing cylinder 1, can have between split type extrusion internal model 2 and the halfbody of divisible forming tool 3
Radial restraining force is reliably completed extrusion molding process without separating；It again can be by removing after completing extrusion process
External mold sleeve 1 opens entire hot extrusion forming recess.
The mold use process is as follows: it is split type squeeze out internal model 2 tubular type chamber and 3 type of divisible forming tool it is intracavitary
Wall coats release agent before the use, convenient for the extrusion and demoulding of mental section, by split type extrusion internal model 2 upper, split type
Positional relationship of the molding die 3 under is placed, and after the outer surface alignment of two molds, external mold sleeve 1 is squeezed from split type
It is inserted in above internal model 2 out, the arch notch and the arched protrusions on divisible forming tool 3 of alignment engaging external mold sleeve 1 make
Split type extrusion internal model 2 and divisible forming tool 3 are completely nested in external mold sleeve 1.It is slightly below cylindrical body portion at the top of protruding portion
Top so that have at the top of cylindrical body portion one section by external mold sleeve 1 entirely around.
After metal scraps are put into split type 2 type chamber of extrusion internal model, mold and extrusion compression bar 8 are put into resistance furnace together
It is heated, and after the heat preservation that assigned temperature carries out a period of time, is placed on vertical hydraulic press lower work platform；In extrusion
Installation squeezes out compression bar 8 (as shown in Figure 1) in the tubular type chamber of internal model 2.After hydraulic press is started to work, pressure head acts on extrusion pressure
On bar 8, and compression bar is pressed down against.Metal enters extrusion discharge port 9 after flowing into feeding inlet 7 under the action of extrusion head, then
Forming process is completed via flowing out after equal channel angular type chamber 6 from total discharge port 5, profile transverse movement after molding, molding length
Degree not will receive the limitation of mold and ground distance.And in the bend by squeezing out internal model 2, since this part is with curved
Degree, therefore secondary operation can be carried out to profile, shape and the distribution for refining crystal grain are more uniform, can also play soldering again
Effect.
After extrusion process, due to the effect of extrusion pressure, overall co-ordination mode becomes being interference fitted mold at this time, can
Support tube is placed below mold, support tube is hollow structure, and interior chamber size is greater than 3 outside of divisible forming tool and is less than outer
The outer diameter of die sleeve cylinder 1.Notch is opened up in the protruding portion position of divisible forming tool 3 at the top of support tube, so that support tube
External mold sleeve 1 can be supported, and divisible forming tool 3 can not then be supported power.Continued by hydraulic press to extrusion compression bar 8
Apply pressure, so that it may squeeze out split type extrusion internal model 2 and divisible forming tool 3.
The divisible forming tool 3 is opened, remaining forming metal can be removed.
The mold combines variable diameter than two kinds of large plastometric set methods of hot extrusion and equal channel angular, in process of production not
Vertical extruder can only be efficiently solved and squeeze out the limitation that distance receives press depth, and the metal squeezed out by variable diameter
It is plastically deformed again by equal channel angular, achievees the effect that further to refine crystal grain, the knot of the mental section of acquisition
Structure and performance will be more preferable.The mold is applicable to various metals and its particle or crumble.
Embodiment 2
The present embodiment difference from Example 1 is only that: the split type tubular type chamber for squeezing out internal model 2 and split type molding
The ratio between cross-sectional area of hot extrusion discharge port 9 in mold 3 is 40:1, and the corner bend angle in equal channel angular type chamber 6 is
150°.The type chamber of divisible forming tool be it is rectangular, the product of formation is square rod.Other structures are the same as embodiment 1.
Embodiment 3
The present embodiment difference from Example 1 is only that the split type tubular type chamber for squeezing out internal model 2 and split type molding
The ratio between cross-sectional area of hot extrusion discharge port 9 in mold 3 is 25:1, and the corner bend angle in equal channel angular type chamber 6 is
120°.The type chamber of divisible forming tool is regular hexagon, and the product of formation is hexagonal rod.Other structures are the same as embodiment 1.
Above-described embodiment is the preferable embodiment of the utility model, does not limit the protection scope of the utility model,
The change, modification, substitution, combination and simplification of his any pair of the utility model, without departing from the spirit of the utility model
Essence and principle should be equivalent substitute mode, be included within the protection scope of the utility model.
Claims (10)
1. a kind of hot extrusion molding die with equal channel angular, which is characterized in that including external mold sleeve (1), it is split type squeeze
Internal model (2), divisible forming tool (3) out；The split type extrusion internal model (2) is in hollow circuit cylinder tubular, and inside is tubular
Type chamber；It is intracavitary to squeeze out the tubular type that compression bar (8) are set to split type extrusion internal model (2) with gap fiting mode, the two composition column
Plug is secondary；Divisible forming tool (3) is made of cylindrical body portion and protruding portion, and the protruding portion is set to the side wall in cylindrical body portion
On, it is described that split type extrusion internal model (2) coaxial placement is above the cylindrical body portion and the outer diameter of the two is identical；The cylindrical body
It is offered at the top of portion feeding inlet (7), feeding inlet (7) bottom face hot extrusion discharge port (9), the protruding portion side wall opens up
There is total discharge port (5) for output type material, by with corner bend between hot extrusion discharge port (9) and total discharge port (5)
Equal channel angular type chamber (6) be connected；The tubular type chamber, feeding inlet (7), hot extrusion discharge port (9), equal channel angular type
Chamber (6) is sequentially connected to total discharge port (5), constitutes hot extrusion forming recess；The split type extrusion internal model (2) and split type
Molding die (3) is spliced by the two halves of mirror symmetry, enables the hot extrusion forming recess to Semi-folding；It is described
External mold sleeve (1) be in hollow circuit cylinder tubular, and its bottom offer with the matched notch of the protruding portion, external mold sleeve with
Gap fit system is sheathed on split type extrusion internal model (2) and divisible forming tool (3) is external, to limit split type extrusion internal model
(2) and the folding of divisible forming tool (3).
2. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the outer die casing
Cylinder (1) is highly equal to split type the sum of the height for squeezing out internal model (2) and divisible forming tool (3), and top is squeezed with split type
Concordant at the top of internal model (2) out, bottom is concordant with divisible forming tool (3) bottom；The notch of external mold sleeve (1) bottom is stuck in institute
State protruding portion upper surface.
3. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the hot extrusion
The section shape and size of discharge port (9), equal channel angular type chamber (6) and total discharge port (5) three is consistent.
4. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that described is split type
The ratio between tubular type chamber and the cross-sectional area of hot extrusion discharge port (9) in divisible forming tool (3) for squeezing out internal model (2) are 4
~400:1.
5. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the described equal channels
Corner bend angle in corner type chamber (6) is 90 °~150 °.
6. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the hot extrusion
The cross-sectional shape of discharge port (9), equal channel angular type chamber (6) and total discharge port (5) is round, rectangular or polygon.
7. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that described is split type
In molding die (3), cylindrical body portion and protruding portion are integrally formed.
8. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that described is split type
In molding die (3), protruding portion is in arched door shape.
9. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the feeding inlet
It (7) is in inverted round table shape, internal diameter is gradually reduced from top to bottom.
10. as described in claim 1 with the hot extrusion molding die of equal channel angular, which is characterized in that the extrusion
Compression bar (8) connects with the pressure head of hydraulic press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820775979.3U CN208213965U (en) | 2018-05-23 | 2018-05-23 | A kind of hot extrusion molding die with equal channel angular |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820775979.3U CN208213965U (en) | 2018-05-23 | 2018-05-23 | A kind of hot extrusion molding die with equal channel angular |
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| Publication Number | Publication Date |
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| CN208213965U true CN208213965U (en) | 2018-12-11 |
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| CN201820775979.3U Expired - Fee Related CN208213965U (en) | 2018-05-23 | 2018-05-23 | A kind of hot extrusion molding die with equal channel angular |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076337A (en) * | 2019-06-12 | 2019-08-02 | 齐齐哈尔翔科新材料有限公司 | A kind of multidirectional twin-stage restrained deformation device of aluminum matrix composite and its application method |
| CN113828777A (en) * | 2021-10-28 | 2021-12-24 | 四川科匠轻金属材料科技有限公司 | Device and process for preparing high-strength alloy by metal powder semi-continuous extrusion |
-
2018
- 2018-05-23 CN CN201820775979.3U patent/CN208213965U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076337A (en) * | 2019-06-12 | 2019-08-02 | 齐齐哈尔翔科新材料有限公司 | A kind of multidirectional twin-stage restrained deformation device of aluminum matrix composite and its application method |
| CN113828777A (en) * | 2021-10-28 | 2021-12-24 | 四川科匠轻金属材料科技有限公司 | Device and process for preparing high-strength alloy by metal powder semi-continuous extrusion |
| CN113828777B (en) * | 2021-10-28 | 2023-07-21 | 四川科匠轻金属材料科技有限公司 | Device and process for preparing high-strength alloy by semi-continuous extrusion of metal powder |
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Granted publication date: 20181211 |