CN115786669A - Controlled cooling process and equipment for non-adjustable steel piston - Google Patents
Controlled cooling process and equipment for non-adjustable steel piston Download PDFInfo
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- CN115786669A CN115786669A CN202211250939.4A CN202211250939A CN115786669A CN 115786669 A CN115786669 A CN 115786669A CN 202211250939 A CN202211250939 A CN 202211250939A CN 115786669 A CN115786669 A CN 115786669A
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- 238000001816 cooling Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 title claims description 17
- 239000010959 steel Substances 0.000 title claims description 17
- 238000005242 forging Methods 0.000 claims abstract description 26
- 238000004321 preservation Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 3
- 238000001514 detection method Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention discloses a cooling control process and equipment for a non-steel-adjusting piston, and relates to the field of piston correlation, wherein a forged and formed piston is subjected to temperature detection, the piston is qualified when the temperature of the product is higher than or equal to 930 ℃, the qualified product is placed on a cooling control mechanism, and the temperature of a cooling control outlet of a piston forging is controlled to be about 700 +/-20 ℃ by adjusting the air quantity of a fan and the speed of a conveying belt.
Description
Technical Field
The invention relates to the field of pistons, in particular to a cooling control process and cooling control equipment for a non-tempered steel piston.
Background
The piston is a reciprocating element in the cylinder body of the automobile engine. The basic structure of the piston can be divided into a crown, a crown and a skirt. The piston crown is the main part that constitutes the combustion chamber and its shape is related to the selected form of the combustion chamber. The gasoline engine mostly adopts a flat-top piston, and has the advantages of small heat absorption area, and the temperature of each stage needs to be controlled in the preparation process of the piston, so that the quality of the piston is ensured.
Disclosure of Invention
The invention aims to provide a controlled cooling process and controlled cooling equipment for a non-tempered steel piston, which aim to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a controlled cooling process of an unadjusted steel piston comprises the following steps:
the method comprises the following steps: detecting the temperature of the piston formed by forging, wherein the piston is a qualified product when the temperature of the product is more than or equal to 930 ℃;
step two: placing qualified products on a cooling control mechanism, and controlling the temperature of a cooling control outlet of the piston forging to be about 700 +/-20 ℃ by adjusting the air quantity of a fan and the speed of a conveying belt;
step three: placing the piston forging in the step two in an air cooling mechanism, slowly cooling the forging, and controlling the outlet temperature of the air cooling section of the piston forging to be 650 +/-20 ℃ by adjusting the speed of a conveyor belt;
step four: placing the piston forging in the third step into a heat preservation mechanism, and keeping the temperature of the piston forging at 600 +/-10 ℃ through a heating furnace for heat preservation and cooling;
step five: and (4) enabling the piston forging to leave the heat preservation mechanism, wherein the outlet temperature of the piston forging is lower than 600 ℃.
Preferably, the processing time of the cooling control mechanism, the air cooling mechanism and the heat preservation mechanism in the second step, the third step and the fourth step is 180-300S, 120-240S and 300-600S respectively.
The utility model provides an equipment of cold technology of accuse of non-accent steel piston, includes the base, the base is "concave" style of calligraphy, and the left and right sides height is greater than its middle height, the fixed accuse cold mechanism that is equipped with in base left side upper end, the fixed heat preservation mechanism that is equipped with in base right side upper end, the fixed air cooling mechanism that is equipped with in upper end in the middle of the base, air cooling mechanism connects accuse cold mechanism with heat preservation mechanism to make the piston can be in advance handle in the accuse cold mechanism, thereby make the piston reach required hardness and required performance through accuse cold, carry out natural cooling through air cooling mechanism, make the product slowly cool down to appointed temperature, and then make it enter into in the heat preservation mechanism, the time of extension piston at appointed temperature makes the tissue of piston transform as far as possible, guarantees the metallographic structure of last piston.
Preferably, the cooling control mechanism comprises a cooling control box fixed to the upper end of the left side of the base, the cooling control box is of a hollow structure, square openings are formed in the left side and the right side of the cooling control box and communicated with the left end and the right end of the cooling control box, two identical blowers are fixedly arranged at the upper end of the inside of the cooling control box, the air quantity of each blower is adjustable, an infrared detector is fixedly arranged at the upper end of the right side of the cooling control box, a control panel is fixedly arranged at the upper end of the outer portion of the upper end of the cooling control box, and the control panel is connected with the infrared detector through an electric wire, so that the low temperature or the over temperature of a product can be monitored.
Preferably, the inner wall of the left side of the cooling control box and the outer wall of the right side of the cooling control box are respectively and fixedly provided with two same shielding blocks, a shielding shaft is arranged between the shielding blocks in a rotating mode, and a shielding plate is fixedly arranged on the shielding shaft, so that openings on the left side and the right side of the cooling control box can be shielded, and further temperature change can be reduced.
Preferably, the air cooling mechanism comprises four same support rods fixed at the upper end of the middle of the base, belt wheels are arranged between the front support rod and the rear support rod in a rotating mode, an air cooling conveying belt is connected between the belt wheels, and the speed of the air cooling conveying belt is adjustable.
Preferably, the upper ends of the two supporting rods on the left side are fixedly provided with extension plates, two extension plates are rotatably arranged between the extension plates and are provided with cooling control shafts, cooling control belt wheels are fixedly arranged on the cooling control shafts, the outside of the left side of the cooling control box is rotatably provided with the same cooling control shafts and the same cooling control belt wheels, two cooling control conveyor belts are connected and arranged between the cooling control belt wheels and penetrate through the left end and the right end of the cooling control box, and the speed of the cooling control belt wheels is adjustable.
Preferably, the heat preservation mechanism comprises a heat preservation box fixed at the upper end of the right side of the base, the heat preservation box is of a hollow structure and is also provided with a square opening, the conveyor belt penetrates through the left end and the right end, and a shielding plate is arranged at the opening to reduce the temperature change.
In conclusion, the beneficial effects of the invention are as follows:
1. according to the invention, the temperature of the piston is detected firstly, so that the qualified piston passes through the cooling control section and the air cooling section, the temperature of the passing piston can be controlled, and simultaneously, the air volume and the conveying speed of the internal fan can be adjusted, so that the forged piston is rapidly cooled to the required temperature, and the piston can reach the required hardness box performance requirement through cooling control.
2. The invention prolongs the time of the piston at the designated temperature through the heat preservation section, so that the structure of the piston is transformed as much as possible, and the metallographic structure of the final piston is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall three-dimensional structure of the equipment for the controlled cooling process of a non-tempered steel piston according to the present invention;
FIG. 2 isbase:Sub>A schematic cross-sectional view taken at A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1 according to the present invention.
The scores in the figures are as follows: 11. a base; 12. a support bar; 13. a pulley; 14. air-cooling the conveyor belt; 15. an extension plate; 16. controlling the cooling shaft; 17. a cold control belt wheel; 18. a controlled cooling conveyor belt; 19. a cooling control box; 20. a blower; 21. an infrared detector; 22. a control panel; 24. a stop block; 25. a shield shaft; 26. a shielding plate; 27. and (7) an incubator.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention will now be described in detail with reference to fig. 1-3, wherein for ease of description the orientations described hereinafter are defined as follows: the up, down, left, right, front, rear direction described below corresponds to the front, back, left, right, top, bottom direction of the view of fig. 1, fig. 1 is a front view of the apparatus of the present invention, and the direction shown in fig. 1 corresponds to the front, back, left, right, top, bottom direction of the apparatus of the present invention.
Referring to fig. 1-3, an embodiment of the present invention is shown: a controlled cooling process and equipment for non-tempered steel piston includes the following steps:
the method comprises the following steps: detecting the temperature of the forged and formed piston, wherein the piston is a qualified product when the temperature of the product is more than or equal to 930 ℃;
step two: placing qualified products on a cooling control mechanism, and controlling the temperature of a cooling control outlet of the piston forging to be about 700 +/-20 ℃ by adjusting the air quantity of a fan and the speed of a conveying belt;
step three: placing the piston forging in the step two in an air cooling mechanism, slowly cooling the forging, and controlling the outlet temperature of the air cooling section of the piston forging to be 650 +/-20 ℃ by adjusting the speed of a conveyor belt;
step four: placing the piston forging in the third step into a heat preservation mechanism, and keeping the temperature of the piston forging at 600 +/-10 ℃ through a heating furnace for heat preservation and cooling;
step five: and (4) enabling the piston forging to leave the heat preservation mechanism, wherein the outlet temperature of the piston forging is lower than 600 ℃.
In addition, in one embodiment, the processing time of the cooling control mechanism, the air cooling mechanism and the heat preservation mechanism in the second step, the third step and the fourth step is respectively 180-300S, 120-240S and 300-600S.
The utility model provides a cold technology of accuse of non-accent steel piston and equipment thereof, includes base 11, base 11 is "concave" style of calligraphy, and the left and right sides height is greater than its intermediate height, the fixed cold mechanism that is equipped with of base 11 left side upper end, the fixed heat preservation mechanism that is equipped with in base 11 right side upper end, the fixed air cooling mechanism that is equipped with in base 11 middle upper end, air cooling mechanism connects accuse cold mechanism with heat preservation mechanism to make the piston can be earlier in handle in the accuse cold mechanism, thereby make the piston reach required hardness and required performance through accuse cold, carry out natural cooling through air cooling mechanism, make the product slowly cool down to appointed temperature, and then make it enter into in the heat preservation mechanism, the extension piston is at the time of appointed temperature, makes the tissue of piston convert as far as possible, guarantees the metallographic structure of last piston.
In addition, in an embodiment, the cooling control mechanism comprises a cooling control box 19 fixed at the upper end of the left side of the base 11, the cooling control box 19 is of a hollow structure, square openings are formed in the left side and the right side of the cooling control box 19 so as to communicate the left end and the right end of the cooling control box 19, two identical blowers 20 are fixedly arranged at the upper end in the cooling control box 19, the air quantity of the blowers 20 is adjustable, an infrared detector 21 is fixedly arranged at the upper end of the right side of the cooling control box 19, a control panel 22 is fixedly arranged at the upper end of the outer part of the upper end of the cooling control box 19, and the control panel 22 is connected with the infrared detector 21 through an electric wire, so that the low temperature or the over-temperature of a product can be monitored.
In addition, in an embodiment, two same shielding blocks 24 are fixedly arranged on the inner wall of the left side of the cooling control box 19 and the outer wall of the right side of the cooling control box 19 respectively, a shielding shaft 25 is arranged between the two shielding blocks 24 in a rotating manner, and a shielding plate 26 is fixedly arranged on the shielding shaft 25, so that openings on the left side and the right side of the cooling control box 19 can be shielded, and further temperature change can be reduced.
In addition, in one embodiment, the air cooling mechanism comprises four same support rods 12 fixed at the upper middle end of the base 11, belt wheels 13 are rotatably arranged between the front support rod 12 and the rear support rod 12, an air cooling conveyor belt 14 is connected between the belt wheels 13, and the speed of the air cooling conveyor belt 14 is adjustable.
In addition, in an embodiment, extension plates 15 are fixedly arranged at the upper ends of two support rods 12 on the left side, a cooling control shaft 16 is rotatably arranged between the two extension plates 15, a cooling control belt pulley 17 is fixedly arranged on the cooling control shaft 16, the same cooling control shaft 16 and the same cooling control belt pulley 17 are rotatably arranged outside the left side of a cooling control box 19, a cooling control conveyor belt 18 is connected between the two cooling control belt pulleys 17, the cooling control conveyor belt 18 penetrates through the left end and the right end of the cooling control box 19, and the speed of the cooling control belt pulley 17 is adjustable.
In addition, in an embodiment, the heat insulation mechanism comprises a heat insulation box 27 fixed at the upper end of the right side of the base 11, the heat insulation box 27 is of a hollow structure and is also provided with a square opening, the conveyor belt penetrates through the left end and the right end, and a shielding plate 26 is arranged at the opening to reduce the temperature change.
When embodied in practice
When the piston is cooled in a controlled manner, firstly, the temperature of the forged and formed piston is detected, the piston is qualified when the temperature of the product is not less than 930 ℃, the qualified product is placed in a cooling control box 19, a cooling control shaft 16 is started, so that a cooling control belt wheel 17 rotates, the piston on the cooling control belt wheel 17 moves, at the moment, the control panel 22 is controlled, so that a blower 20 is started, so that air is blown to the piston, the temperature is reduced, meanwhile, an infrared detector 21 can monitor the temperature of the piston, so that the piston reaches the specified temperature, meanwhile, the piston contacts a shielding plate 26, so that the shielding plate 26 can rotate, so that the piston can penetrate through the cooling control box 19, and at the moment, the piston falls onto an air cooling conveyor belt 14, so that the piston reaches the specified temperature, can enter the cooling control belt wheel 17, the temperature of the piston is preserved, the time of the piston at the specified temperature is prolonged, the structure of the piston is transformed as much as possible, and the structure of the final piston is ensured.
The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.
Claims (8)
1. A controlled cooling process of a non-tempered steel piston is characterized in that: the method comprises the following steps:
the method comprises the following steps: detecting the temperature of the forged and formed piston, wherein the piston is a qualified product when the temperature of the product is more than or equal to 930 ℃;
step two: placing qualified products on a cooling control mechanism, and controlling the temperature of a cooling control outlet of the piston forging to be about 700 +/-20 ℃ by adjusting the air quantity of a fan and the speed of a conveying belt;
step three: placing the piston forging in the step two in an air cooling mechanism, slowly cooling the forging, and controlling the outlet temperature of the air cooling section of the piston forging to be 650 +/-20 ℃ by adjusting the speed of a conveyor belt;
step four: placing the piston forging in the third step in a heat preservation mechanism, and keeping the temperature of the piston forging at 600 +/-10 ℃ through a heating furnace for heat preservation and cooling;
step five: and (4) enabling the piston forging to leave the heat preservation mechanism, wherein the outlet temperature of the piston forging is lower than 600 ℃.
2. A process for controlled cooling of a non-tempered steel piston as claimed in claim 1 wherein: in the second step, the machining time of the cooling control mechanism is 180-300S, in the third step, the machining time of the air cooling mechanism is 120-240S, and in the fourth step, the machining time of the heat preservation mechanism is 300-600S.
3. An apparatus for the controlled cooling process of a non-tempered steel piston as recited in any of claims 1-2 wherein: including base (11), base (11) are "concave" style of calligraphy, and the left and right sides height is greater than its middle height, base (11) left side upper end is fixed to be equipped with accuse cold mechanism, base (11) right side upper end is fixed to be equipped with heat preservation mechanism, the fixed air cooling mechanism that is equipped with in upper end in the middle of base (11), air cooling mechanism connects accuse cold mechanism with heat preservation mechanism.
4. The apparatus for controlled cooling of a non-tempered steel piston as recited in claim 3 wherein: the cold mechanism of accuse is including fixing accuse cold box (19) of base (11) left side upper end, accuse cold box (19) are hollow structure, accuse cold box (19) left and right sides has square opening, the fixed hair-dryer (20) that are equipped with two the same in accuse cold box (19) upper end, hair-dryer (20) amount of wind is adjustable, accuse cold box (19) right side upper end is fixed and is equipped with infrared detector (21), fixed control panel (22) that are equipped with in accuse cold box (19) upper end outside upper end, control panel (22) with pass through connection of electric lines between infrared detector (21).
5. The apparatus for the controlled cooling process of an unconditioned steel piston according to claim 4, wherein: accuse cold box (19) left side inner wall with it shelters from piece (24) to be fixed two the same respectively on accuse cold box (19) right side outer wall, two it is equipped with between piece (24) to shelter from to rotate and shelters from axle (25), shelter from axle (25) and go up fixed shielding plate (26) that is equipped with.
6. The apparatus for controlled cooling of a non-tempered steel piston as recited in claim 3 wherein: the air cooling mechanism comprises four same supporting rods (12) fixed to the upper end of the middle of the base (11), belt wheels (13) are arranged between the supporting rods (12) in a rotating mode, air cooling conveying belts (14) are connected between the belt wheels (13), and the speed of the air cooling conveying belts (14) is adjustable.
7. The apparatus for controlled cooling of a non-tempered steel piston as recited in claim 6 wherein: two on the left side bracing piece (12) upper end is fixed and is equipped with extension plate (15), two it is equipped with accuse cold axle (16) to rotate between extension plate (15), the fixed accuse cold band pulley (17) that is equipped with on accuse cold axle (16), accuse cold box (19) left side outside is rotated and is equipped with same accuse cold axle (16) and accuse cold band pulley (17), two it is equipped with accuse cold conveyer belt (18) to connect between accuse cold band pulley (17), accuse cold conveyer belt (18) are passed both ends about accuse cold box (19), just accuse cold band pulley (17) speed is adjustable.
8. The apparatus for controlled cooling of a non-tempered steel piston as recited in claim 3 wherein: the heat preservation mechanism comprises a heat preservation box (27) fixed to the upper end of the right side of the base (11), the heat preservation box (27) is of a hollow structure and is also provided with a square opening, the conveyor belt penetrates through the left end and the right end, and a shielding plate (26) is arranged at the opening.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250939.4A CN115786669A (en) | 2022-10-12 | 2022-10-12 | Controlled cooling process and equipment for non-adjustable steel piston |
| PCT/CN2022/129142 WO2024077679A1 (en) | 2022-10-12 | 2022-11-02 | Controlled cooling process for piston made of non-quenched and tempered steel, and device for controlled cooling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250939.4A CN115786669A (en) | 2022-10-12 | 2022-10-12 | Controlled cooling process and equipment for non-adjustable steel piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115786669A true CN115786669A (en) | 2023-03-14 |
Family
ID=85432918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211250939.4A Pending CN115786669A (en) | 2022-10-12 | 2022-10-12 | Controlled cooling process and equipment for non-adjustable steel piston |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115786669A (en) |
| WO (1) | WO2024077679A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276010A (en) * | 1991-03-01 | 1992-10-01 | Toyota Motor Corp | Method for conditioning forging |
| KR19980072267A (en) * | 1997-03-03 | 1998-11-05 | 토니헬샴 | Heating and cooling methods of non-alloyed steel and apparatus |
| JP3764273B2 (en) * | 1998-06-04 | 2006-04-05 | Ｊｆｅ条鋼株式会社 | Manufacturing method of hot forged steel part excellent in machinability, its part, hot rolled steel material used therefor, and manufacturing method of steel material |
| CN102397965B (en) * | 2010-09-17 | 2014-11-19 | 机械科学研究总院先进制造技术研究中心 | Microalloy non-quenched and tempered steel forging and cooling control technology and automatic production line |
| CN111496174A (en) * | 2020-05-22 | 2020-08-07 | 安徽安簧机械股份有限公司 | Cooling control system and cooling method suitable for non-quenched and tempered steel piston after forging |
| CN112296247B (en) * | 2020-10-10 | 2022-05-06 | 中国重汽集团济南动力有限公司 | Cooling process for manufacturing expansion-breaking connecting rod blank by using 38MnVS6 medium carbon non-quenched and tempered steel |
| CN114273601A (en) * | 2021-11-10 | 2022-04-05 | 浙江跃进机械有限公司 | Cold section control system |
-
2022
- 2022-10-12 CN CN202211250939.4A patent/CN115786669A/en active Pending
- 2022-11-02 WO PCT/CN2022/129142 patent/WO2024077679A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024077679A1 (en) | 2024-04-18 |
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