CN212857164U - Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy - Google Patents
Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy Download PDFInfo
- Publication number
- CN212857164U CN212857164U CN202021420831.1U CN202021420831U CN212857164U CN 212857164 U CN212857164 U CN 212857164U CN 202021420831 U CN202021420831 U CN 202021420831U CN 212857164 U CN212857164 U CN 212857164U
- Authority
- CN
- China
- Prior art keywords
- extrusion
- die
- channel
- angle
- shaped right
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 113
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 25
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 23
- 238000007670 refining Methods 0.000 claims abstract description 10
- 230000007704 transition Effects 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 3
- 239000011777 magnesium Substances 0.000 claims 3
- 239000000463 material Substances 0.000 abstract description 28
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 239000013078 crystal Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Extrusion Of Metal (AREA)
Abstract
An equal channel angular extrusion die for refining magnesium alloy and aluminum alloy grains belongs to the technical field of material processing. A constant diameter angle extrusion die for magnesium alloy and aluminum alloy crystalline grain refines, including last mold squeeze tube, die holder, compression leg and fixing pin, go up mold squeeze tube and die holder and pass through fixing pin and connect, set up L shape right angle passageway in last mold squeeze tube and the die holder, the vertical passageway of L shape right angle passageway sets up in last mold squeeze tube, and the horizontal passageway of L shape right angle passageway sets up in the contact surface of last mold squeeze tube and die holder, the compression leg set up in the vertical passageway of L shape right angle passageway. The equal channel angular extrusion die for refining the magnesium alloy and the aluminum alloy grains realizes unloading of the extruded material through the disassembly of the simple extrusion die, has simple disassembly and assembly and simple and convenient operation, and enables the unloading of the excess material to be easier.
Description
Technical Field
The utility model relates to a material processing technology field, in particular to an equal channel angle extrusion die for refining magnesium alloy and aluminum alloy crystal grains.
Background
The magnesium alloy and the aluminum alloy have wider application in the field of aerospace with higher specific strength and specific stiffness, and with the development of aerospace industry, particularly supersonic and hypersonic airplanes, the requirements on the toughness of the magnesium alloy and the aluminum alloy are further improved in the design and manufacturing process, and the obtainment of ultrafine grains is an effective way for improving the material performance.
In production, the preparation process for obtaining the ultrafine grain material is difficult and the cost is high, and the problem to be solved in production is to master an effective, low-cost and simple-process method for obtaining the ultrafine grain structure. The Equal Channel Angular Pressing (ECAP) technology is an effective method for obtaining an ultrafine grain structure, and the ECAP technology refines the grain structure through violent plastic deformation at a certain temperature, improves the microstructure of the material and improves the mechanical property of the material. The magnesium alloy and the aluminum alloy are subjected to severe plastic deformation in the equal channel angular extrusion process, crystal grains are crushed, dislocation and entanglement are formed into sub-crystals in the deformation process, and the purpose of refining the crystal grains and improving the proportion of crystal boundaries is achieved at a certain temperature and in the extrusion process. Along with the improvement of the proportion of grain refining and grain boundary, the movement obstruction of dislocation is increased, and the purpose of simultaneously improving the structure strength and the plasticity is achieved.
The equal channel Extrusion (ECAP) process die has the advantages of simple structure, convenience in installation and maintenance, low cost and great application prospect. Equal channel Extrusion (ECAP) however faces a problem in that the extruded material is difficult to discharge after a 90 ° turn. In general, the remainder of the equal channel angular extrusion is extruded by the next extrusion material or other materials, so that the male die needs to be pulled out again and the extrusion material needs to be added again, the extrusion speed is reduced in the process, and the production cost is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem such as the extrusion die difficulty of unloading that exists among the prior art, the utility model provides a constant diameter angle extrusion die for magnesium alloy and aluminum alloy crystalline grain refine, its dismantlement through simple extrusion die realizes unloading the extrusion material, and the dismouting is simple, easy and simple to handle, makes unloading of clout easier.
In order to realize the purpose, the technical scheme of the utility model is that:
an equal channel angular extrusion die for refining magnesium alloy and aluminum alloy grains comprises an upper die extrusion cylinder, a lower die holder, an extrusion column and a fixing bolt;
the upper die extrusion barrel and the lower die seat are connected through a fixed bolt, L-shaped right-angle channels are arranged in the upper die extrusion barrel and the lower die seat, a vertical channel of the L-shaped right-angle channel is arranged in the upper die extrusion barrel, and a horizontal channel of the L-shaped right-angle channel is arranged on the contact surface of the upper die extrusion barrel and the lower die seat;
the extrusion column is arranged in a vertical channel of the L-shaped right-angle channel.
Further, the cross section of the L-shaped right-angle channel is of a square structure.
Further, the vertical channel of the L-shaped right-angle channel is positioned in the center of the upper die extrusion container.
Furthermore, the horizontal channel of the L-shaped right-angle channel comprises a first rectangular groove arranged on the lower surface of the upper die extrusion cylinder and a second rectangular groove arranged on the upper surface of the lower die base, and the first rectangular groove and the second rectangular groove are identical in structure and are symmetrically arranged.
Furthermore, the joint of the vertical channel and the rectangular groove II adopts circular arc transition.
Further, the extrusion post includes integrated into one piece's boss, changeover portion and pressure head, the boss is cake column structure for be connected with the extruder, the pressure head is square column structure, is used for the extrusion material.
Furthermore, a raised head is arranged at the lower part of the upper die extrusion cylinder, two support lugs corresponding to the raised head are arranged at the upper part of the lower die holder, and through holes for fixing a bolt to pass through are correspondingly formed in the raised head and the support lugs.
The utility model has the advantages that:
(1) the extrusion die of the utility model has simple and separable structure, easy unloading after extrusion, very convenient die disassembly, convenient lubrication and fault treatment of the extrusion channel, convenient maintenance and prolonged service life;
(2) the cross section of the extrusion hole, namely the L-shaped right-angle channel, is square, so that the refining efficiency of crystal grains is increased compared with the existing circular hole, the utilization rate of an extrusion material is improved, and the material is more favorable for the next step of research and the increase of local deformation after extrusion;
(3) the utility model discloses a high strength cyclic loading equal channel angular extrusion mould, realized the problem of unloading after the equal channel angular extrusion, can cyclic loading, through heating better control test temperature, reinforcing material refine degree and even degree, carry out the preparation of material better;
(4) the extrusion die of the utility model obtains superfine crystal grains through violent plastic deformation at a certain temperature, and improves the toughness of the material.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
FIG. 1 is a schematic structural diagram of an isometric extrusion die for grain refinement of magnesium alloy and aluminum alloy according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an upper die container according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a lower die holder according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fixing bolt according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an extrusion column provided in an embodiment of the present invention.
Reference numerals in the drawings of the specification include:
1-an upper die extrusion cylinder, 2-a lower die holder, 3-an extrusion column, 4-a fixing bolt, 5-a vertical channel, 6-a horizontal channel, 7-a boss, 8-a transition section, 9-a pressure head, 10-a through hole, 11-a rectangular groove I, 12-a rectangular groove II, 13-a raised head and 14-a support lug.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "a" and "an" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In order to solve the problems in the prior art, as shown in fig. 1 to 6, the utility model provides an equal channel angular extrusion die for refining magnesium alloy and aluminum alloy grains, which comprises an upper die extrusion cylinder 1, a lower die holder 2, an extrusion column 3 and a fixing bolt 4;
the upper die extrusion cylinder 1 and the lower die holder 2 are connected through a fixing bolt 4, L-shaped right-angle channels are arranged in the upper die extrusion cylinder 1 and the lower die holder 2, a vertical channel 5 of the L-shaped right-angle channel is arranged in the upper die extrusion cylinder 1, and a horizontal channel 6 of the L-shaped right-angle channel is arranged on the contact surface of the upper die extrusion cylinder 1 and the lower die holder 2;
the extrusion column 3 is arranged in a vertical channel 5 of the L-shaped right-angle channel.
The utility model discloses a mould adopts the H13 steel to make, for heatable 90 equal channel angle extrusion die, it adopts the whole compound die design of upper and lower two parts, the first half mainly plays the extrusion, the latter half plays the effect of supporting with production equal channel angle, and extrusion die is whole on spatial position about L shape right angle passageway place plane symmetry, when carrying out the cyclic loading test, die holder 2 is fixed, extrusion post 3 carries out violent plastic deformation through last mold extrusion barrel 1 direction to the test piece and realizes the equal channel angle extrusion. In operation, the ram 9 of the squeeze column 3 is inserted into the vertical channel 5 of the L-shaped right-angle channel.
As shown in fig. 1 to 3, the cross section of the L-shaped right-angle channel is a square structure, the vertical channel 5 of the L-shaped right-angle channel is located in the center of the upper die container 1, the horizontal channel 6 of the L-shaped right-angle channel comprises a first rectangular groove 11 arranged on the lower surface of the upper die container 1 and a second rectangular groove 12 arranged on the upper surface of the lower die holder 2, and the first rectangular groove 11 and the second rectangular groove 12 are identical in structure and are symmetrically arranged. In the embodiment, the L-shaped right-angle channel adopts a square hole with the side length of the cross section multiplied by the side length of 12 multiplied by 12mm, so that the grain refining efficiency is increased, and the utilization rate of an extrusion material is improved; the cross sections of the first rectangular groove 11 and the second rectangular groove 12 are both rectangles with the side length multiplied by the side length of 6 multiplied by 12mm, the first rectangular groove 11 and the second rectangular groove 12 jointly form a horizontal channel 6 of an L-shaped right-angle channel, and the cross section of the horizontal channel 6 is of a square structure with the side length multiplied by the side length of 12 multiplied by 12 mm; and, the junction of the vertical passageway 5 of L shape right angle passageway and the two 12 rectangular channels of the horizontal passageway 6 of L shape right angle passageway adopts the circular arc transition, and the corner parameter is more important parameter of equal channel angle extrusion die, if extrude the too big plastic deformation volume that can not realize of corner, if the corner undersize can cause the deformation violent, the material contains too big defect, and the parameter sets for the corner according to material deformability, temperature isoparametric to be 90, and the setting of inside and outside corner is also more important parameter, the utility model discloses a mode that R ═ 6mm circular arc transition obtains comparatively suitable corner.
As shown in fig. 3 to 5, a boss 13 is provided at a lower portion of the upper die container 1, two support lugs 14 corresponding to the boss 13 are provided at an upper portion of the lower die base 2, and the boss 13 and the support lugs 14 are correspondingly provided with through holes 10 for passing the fixing pins 4. In the embodiment, the upper die extrusion cylinder 1 and the lower die holder 2 are both of cylindrical structures, a raised head 13 is processed at the lower part of the upper die extrusion cylinder 1, a support lug 14 is processed at the upper part of the lower die holder 2, the support lug 14 of the lower die holder 2 is matched with the raised head 13 of the upper die extrusion cylinder 1 and is connected through a fixed bolt 4, and the heights of the raised head 13 and the support lug 14 are both 28 mm; the through holes 10 are provided in two and are connected by two fixing pins 4.
As shown in fig. 6, the extrusion column 3 includes a boss 7, a transition section 8 and a ram 9, which are integrally formed, the boss 7 is of a round cake structure and is used for connecting with an extruder, and the ram 9 is of a square column structure and is used for extruding materials. In this embodiment, the extrusion column 3 is integrally manufactured, and the fit clearance between the pressure head 9 of the extrusion column 3 and the L-shaped right-angle channel of the upper die extrusion cylinder 1 is 0.1 mm.
The utility model relates to a constant diameter angle extrusion die's that is used for magnesium alloy and aluminum alloy crystalline grain to refine working process as follows:
(1) lubricating an upper die extrusion cylinder 1, a lower die holder 2 and an extrusion column 3 by using graphite;
(2) the whole die is arranged on a working platform of an extruder, wherein an extrusion column 3 is arranged on an extrusion plate on the extruder and is fixed, and a lower die holder 2 is fixed on a lower working platform of the extruder;
(3) adding a processed 11.5 multiplied by 140mm magnesium alloy extrusion sample into a die, and adjusting the extrusion state;
(4) installing a small-sized resistance heating furnace outside an extrusion die, deforming hexagonal metal magnesium alloy and the like with poor deformation capability in a hot extrusion mode, heating the die and an extrusion material to a set temperature before extrusion, preserving heat, and performing slow extrusion after temperature equalization to obtain the magnesium alloy material with constant-diameter deformation;
(5) starting an extruder to determine the extrusion stroke and the downward pressing speed according to the length of the extrusion column 3, starting the extruder to extrude, lifting the extrusion column 3 after extrusion, and preparing a second test piece for extrusion;
(6) and after the last test piece is extruded, the extrusion column 3 is disassembled, the fixing bolt 4 between the upper die extrusion cylinder 1 and the lower die holder 2 is disassembled, the upper die extrusion cylinder 1 and the lower die holder 2 are separated, and the extruded material is taken out.
The utility model discloses an adjustable temperature extrusion technique selects suitable temperature according to the difference of material and plastic deformation ability and can satisfy the extrusion of the equal channel angle of the close-packed hexagonal structure of hardness higher, the plasticity is lower and alloy, and of course, extrusion die is also applicable to the aluminum alloy to make extrusion column 3 pulled out smoothly through the lubrication to the mould part and extrusion column 3's boss 7.
The utility model discloses when using, will keep appropriate clearance between last mould recipient 1 and the compression leg 3 in the extrusion process, the pressure head 9 of compression leg 3 and the L of last mould recipient 1 shape right angle passageway fit clearance be 0.1mm, both prevent to go up the upwards returning charge of mould recipient 1 along extrusion process in the extrusion process, also prevent to go up the condition that the locking can not move back the mould appearing between mould recipient 1 and the compression leg 3, and, select to press the single face clearance between material and the L shape right angle passageway to be 0.1-0.15mm according to selected material and extrusion material nature.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. An equal channel angular extrusion die for refining magnesium alloy and aluminum alloy grains is characterized by comprising an upper die extrusion cylinder, a lower die seat, an extrusion column and a fixing bolt;
the upper die extrusion barrel and the lower die seat are connected through a fixed bolt, L-shaped right-angle channels are arranged in the upper die extrusion barrel and the lower die seat, a vertical channel of the L-shaped right-angle channel is arranged in the upper die extrusion barrel, and a horizontal channel of the L-shaped right-angle channel is arranged on the contact surface of the upper die extrusion barrel and the lower die seat;
the extrusion column is arranged in a vertical channel of the L-shaped right-angle channel.
2. The isodiametric extrusion die for grain refinement of magnesium and aluminum alloys according to claim 1, wherein the L-shaped right-angled channel cross-section is of a square configuration.
3. The isodiametric extrusion die for grain refinement of magnesium and aluminum alloys according to claim 1, wherein the vertical passage of the L-shaped right angle passage is located at the center of the upper die container.
4. The equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy according to claim 1, wherein the horizontal channel of the L-shaped right-angle channel comprises a first rectangular groove arranged on the lower surface of the upper die extrusion cylinder and a second rectangular groove arranged on the upper surface of the lower die holder, and the first rectangular groove and the second rectangular groove have the same structure and are symmetrically arranged.
5. The constant diameter angular extrusion die for grain refinement of magnesium alloys and aluminum alloys according to claim 4, wherein the junction of said vertical channel and said second rectangular slot is in circular arc transition.
6. The isodiametric extrusion die for grain refinement of magnesium and aluminum alloys as set forth in claim 1, wherein said extrusion column comprises a boss, a transition section and a ram integrally formed, said boss being of a round cake-like structure and said ram being of a square cylindrical structure.
7. The equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy as claimed in claim 1, wherein a raised head is provided at the lower part of the upper die container, two support lugs corresponding to the raised head are provided at the upper part of the lower die base, and through holes for passing a fixing pin are correspondingly provided at the raised head and the support lugs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021420831.1U CN212857164U (en) | 2020-07-17 | 2020-07-17 | Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021420831.1U CN212857164U (en) | 2020-07-17 | 2020-07-17 | Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212857164U true CN212857164U (en) | 2021-04-02 |
Family
ID=75215351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021420831.1U Expired - Fee Related CN212857164U (en) | 2020-07-17 | 2020-07-17 | Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212857164U (en) |
-
2020
- 2020-07-17 CN CN202021420831.1U patent/CN212857164U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110586681B (en) | Extrusion forming die for cabin component | |
| CN100503066C (en) | Magnesium alloy extrusion deforming processing method and extrusion mould | |
| CN104588428A (en) | Circular channel and corner based extruding and moulding mold and circular channel and corner based extruding and moulding method of magnesium alloy cup-shaped component | |
| CN101157099A (en) | Processing method of magnesium alloy compressional deformation and mold | |
| CN106140847B (en) | A kind of magnesium alloy compressional deformation processing unit (plant) and processing method | |
| CN1864881A (en) | Integral extrusion forming method for asymmetrical assembly parts and apparatus thereof | |
| CN109622648B (en) | Asymmetric continuous large-deformation extrusion forming method for magnesium alloy | |
| CN212857164U (en) | Equal channel angular extrusion die for grain refinement of magnesium alloy and aluminum alloy | |
| CN113560362B (en) | High-performance magnesium alloy variable-section extrusion-torsion composite processing device and preparation process thereof | |
| CN107974652B (en) | A kind of extrusion shearing mold and manufacturing process for realizing magnesium alloy grains | |
| CN112453090B (en) | Real-time online heating constant-temperature equal-channel angular extrusion device and method | |
| CN106939383A (en) | One kind deformation beryllium alumin(i)um alloy plate plasticising extrusion molding preparation method | |
| CN109604365B (en) | Asymmetric continuous large-deformation extrusion processing die for magnesium alloy | |
| CN213944359U (en) | Extrusion equipment for aluminum automobile core piece | |
| CN210359051U (en) | Tool for improving density of molybdenum tube target | |
| CN114368182A (en) | Graphite vacuum double-sided floating press forming system | |
| CN210334252U (en) | Mould workstation with feeding mechanism | |
| CN112756412B (en) | Processing die, processing device and processing technology for continuously producing wide magnesium plate | |
| CN118268564A (en) | Compression molding equipment for tungsten steel production and processing | |
| CN101683708A (en) | Method for manufacturing threaded products with special shaped surfaces | |
| CN214349106U (en) | Compression mould of tape measure gasket | |
| CN112974770B (en) | High-strength aluminum alloy and extrusion casting preparation method | |
| CN216828445U (en) | Screw blind hole structure prepared by sheet material forming and production mold thereof | |
| CN218342920U (en) | Graphite alkene copper composite powder material forming device | |
| CN213559736U (en) | Metal material forming die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210402 |