CN114367618B - Step hexagonal flange screw forming process, device and step hexagonal flange screw - Google Patents
Step hexagonal flange screw forming process, device and step hexagonal flange screw Download PDFInfo
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- CN114367618B CN114367618B CN202210030988.0A CN202210030988A CN114367618B CN 114367618 B CN114367618 B CN 114367618B CN 202210030988 A CN202210030988 A CN 202210030988A CN 114367618 B CN114367618 B CN 114367618B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000000465 moulding Methods 0.000 claims description 32
- 238000005096 rolling process Methods 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000004381 surface treatment Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 6
- 238000007514 turning Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 14
- 239000000047 product Substances 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
-
- 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
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention provides a step hexagonal flange screw forming process, a step hexagonal flange screw forming device and a step hexagonal flange screw. The step hexagonal flange screw forming process omits a machining and turning process, effectively shortens the product period and improves the product yield.
Description
Technical Field
The invention belongs to the field of fastener forming, and particularly relates to a step hexagonal flange screw forming process and device and a step hexagonal flange screw.
Background
At present, a screw is a common fastener, and a tool for progressively fastening a machine part of the fastener is an indispensable industrial necessity in daily life by utilizing the physical and mathematical principles of inclined circular rotation and friction force of an object: very small screws for use in cameras, spectacles, watches, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; as for engineering, construction and bridge, large-sized screws and nuts are used; traffic tools, airplanes, electric cars, automobiles and the like are combined with large screws, so that the screws are seen to have important tasks in industry, and the yield and the quality of the screws are very important.
The screw for connecting the automobile electrical box at present is a stepped hexagonal flange screw, and comprises a plurality of forming rods, and annular grooves are formed on the side surfaces of the connecting parts of the two forming rods, and the process flow for producing the screw is as follows: cutting, cold heading, tail cutting, machining and turning, tooth twisting, heat treatment and electroplating. The production process flow is long, the working procedures are required to be matched for production, the probability of defective products is high, and how to shorten the production period of the screw and reduce the defective rate of the products is a problem worth discussing.
Disclosure of Invention
In view of the problems in the prior art, the main purpose of the invention is to provide a step hexagonal flange screw forming process, a device and a step hexagonal flange screw, wherein the step hexagonal flange screw forming process abandons the machining and turning process with the lowest production efficiency, and the forming of a forming rod is finished by directly clamping a die on a cold header, so that the production process flow can be effectively shortened, the cooperation production among the processes is reduced, the defective rate of products is effectively reduced, and the production efficiency is improved.
The aim of the invention is achieved by the following technical scheme:
the invention provides a step hexagonal flange screw forming process, which comprises a rod part, a hexagonal head part, a hexagonal flange table, a first forming rod, a second forming rod, a third forming rod and a fourth forming rod, wherein the hexagonal head part, the hexagonal flange table, the first forming rod, the second forming rod, the third forming rod and the fourth forming rod are sequentially arranged from one end of the rod part, and a groove is formed in the side surface of the connecting part of the first forming rod and the second forming rod, and the step comprises the following steps:
cutting the wire to form a blank;
reducing deformation is carried out on the blank to form a first preformed part, a second preformed part and a third preformed part which are connected in sequence, wherein the diameters of the first preformed part, the second preformed part and the third preformed part are sequentially reduced;
stamping the first preform portion to form a screw head blank and the first forming stem, stamping an end of the third preform portion remote from the first preform portion to form a chamfer;
forming the hexagonal head by toe angle of the screw head blank;
after the hexagonal head part is formed, a rod is bundled at one end of the third preformed part, which is far away from the hexagonal head part, so as to form the third forming rod and the fourth forming rod, and one end of the hexagonal head part, which is close to the second preformed part, is punched so as to form the hexagonal flange table;
after the hexagonal flange platform is formed, placing the second preformed part on a die to perform die assembly and pressing so as to form the groove and the second forming rod;
after the groove and the second forming rod are formed, cutting the tail of the fourth forming rod to form the end part of the fourth forming rod into a spherical surface;
threading the third forming bar after cutting the fourth forming bar to form threads on an outer surface thereof;
after the threads are formed, the stepped hex flange screw is heat treated and surface treated.
As a further description of the above technical solution, in the step of "placing the second preform portion on a mold for mold closing and pressing", the method further includes the steps of:
fixing one end of the fourth forming rod far away from the hexagonal head part on a main die;
abutting the hexagonal head portion against a die;
and the main die is clamped relative to the die along the axial direction of the stepped hexagonal flange screw so as to apply an acting force to the second preformed part to form the groove and the second forming rod.
As a further description of the above technical solution, in the step of "threading the third forming bar to form threads on its outer surface", it is specifically included to place the third forming bar on a threading machine that reciprocates relatively in a horizontal direction so that the third forming bar rotates along its own axis to form threads.
The invention also provides a device for forming the step hexagonal flange screw, which adopts the step hexagonal flange screw forming process, wherein the step hexagonal flange screw comprises a rod part, a hexagonal head part, a hexagonal flange table, a first forming rod, a second forming rod, a third forming rod and a fourth forming rod, which are sequentially arranged from one end of the rod part, and the side surface of the connecting part of the first forming rod and the second forming rod is provided with a groove, and the device comprises: the device comprises a cold header, a tail cutting machine, a thread rolling machine, a heat treatment device and a surface treatment device, wherein the cold header is used for cutting wires and forming the hexagon head part of the step hexagon flange screw, the hexagon flange table and a forming rod, the tail cutting machine is used for cutting tails, the thread rolling machine is used for rolling threads, the heat treatment device is used for carrying out heat treatment on the step hexagon flange screw after thread rolling, and the surface treatment device is used for carrying out surface treatment on the step hexagon flange screw.
As further description of the technical scheme, the cold header comprises a feeding unit, a shearing unit, a conveying unit and five dies, wherein the five dies comprise a main die and a stamping die which is arranged corresponding to the main die.
As a further description of the above technical solution, the thread rolling machine includes a first thread rolling plate and a second thread rolling plate that are disposed opposite to each other, and the first thread rolling plate and the second thread rolling plate are displaced relatively in a horizontal direction, so as to drive the stepped hexagonal flange screw to rotate around its own axis.
The invention also provides a step hexagonal flange screw, which is manufactured by adopting the step hexagonal flange screw molding process, and comprises the following steps:
the device comprises a rod part, a hexagonal head part, a hexagonal flange table, a first forming rod, a second forming rod, a third forming rod and a fourth forming rod, wherein the hexagonal head part, the hexagonal flange table, the first forming rod, the second forming rod, the third forming rod and the fourth forming rod are sequentially arranged from one end of the rod part; and grooves are formed on the side surfaces of the connecting parts of the first forming rod and the second forming rod.
As a further description of the above technical solution, the groove is annular.
As a further description of the above technical solution, the third forming rod is formed with threads.
In summary, the outstanding effects of the invention are as follows:
the step hexagonal flange screw forming process provided by the invention eliminates the machining and turning procedure with the lowest production efficiency, and the forming rod is formed by directly closing the die on the cold header, so that the production process flow is effectively shortened, the step hexagonal flange screw production efficiency is improved, the speed of 65 bolts per minute per machine can be achieved through verification, and the step hexagonal flange screw forming process is more suitable for batch production;
the step hexagonal flange screw forming process reduces the cooperation production with machining and turning procedures, and effectively reduces the defective rate of products.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of blanks required in a step hex flange screw forming process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a blank after diameter shrinkage deformation required in a step hexagonal flange screw forming process according to an embodiment of the present invention;
FIG. 3 is a schematic view of a first molded rod in a stepped hexagonal flange screw molding process according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a hexagonal head formed in the step hexagonal flange screw forming process according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a third molding rod, a fourth molding rod and a hexagonal flange table after molding in the step hexagonal flange screw molding process according to the embodiment of the present invention;
FIG. 6 is a diagram showing the mold closing during the step hexagon flange screw forming process according to the embodiment of the present invention;
fig. 7 is a diagram of a finished product after cutting tails and threads are formed in a stepped hex flange screw forming process according to an embodiment of the present invention.
Reference numerals illustrate:
1-blank; 2-a first preform; 3-a second preform; 4-a third preform; 51-first forming bar; 52-hex head; 53-hexagonal flange table; 54-a third forming bar; 55-fourth forming bar; 56-grooves; 57-second forming bar.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "middle", "lower", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 7, the present application provides a step hexagonal flange screw forming process, which includes a stem portion and a hexagonal head portion 52, a hexagonal flange table 53, a first forming rod 51, a second forming rod 57, a third forming rod 54, and a fourth forming rod 55 sequentially disposed from one end of the stem portion. A groove 56 is formed in a side surface of a connecting portion between the first molding rod 51 and the second molding rod 57, and any two adjacent ones of the first molding rod 51, the second molding rod 57, the third molding rod 54, and the fourth molding rod 55 have different radii.
First, referring specifically to fig. 1, a feeding unit feeds a wire into a cutting unit, which cuts the wire to form a blank 1.
Next, referring specifically to fig. 2, the blank 1 is subjected to reducing deformation by a die to form a first preform 2, a second preform 3 and a third preform 4 which are sequentially connected, the first preform 2, the second preform 3 and the third preform 4 being defined from left to right in this order, and the diameters thereof being sequentially smaller.
Next, referring specifically to fig. 3, the first preform portion 2 is punched by a die to form a screw head blank and the first forming rod 51, and the end of the third preform portion 4 remote from the first preform portion 2 is punched to form a chamfer;
next, referring specifically to fig. 4, the screw head blank is subjected to toe angles to form the hexagonal head 52;
next, referring specifically to fig. 5, after the hexagonal head 52 is formed, the end of the third preform 4, which is far from the hexagonal head 52, is tied to form the third forming rod 54 and the fourth forming rod 55, and the end of the hexagonal head 52, which is near the second preform 3, is punched to form the hexagonal flange 53.
Next, referring specifically to fig. 6, after the hexagonal flange 53 is formed, the second preform 3 is placed on a mold to perform mold clamping, which specifically includes fixing an end of the fourth molding rod 55 away from the hexagonal head 52 to a main mold, at this time, the hexagonal head 52 is abutted against a die, and the main mold is clamped against the die along the axial direction of the stepped hexagonal flange screw to apply a force to the second preform 3 to form the groove 56 and the second molding rod 57, wherein the groove 56 is annular.
Then, referring specifically to fig. 7, after the groove 56 and the second molding rod 57 are formed, the fourth molding rod 55 is cut to form a spherical end, and the third molding rod 54 is placed on a thread rolling machine. The screw is started up and relatively reciprocated in the horizontal direction so that the third molding rod 54 rotates along its own axis to form a screw thread on its outer surface. Finally, the stepped hexagonal flange screw formed with the threads is subjected to heat treatment and surface treatment, wherein the surface treatment comprises the procedures of coating, packaging and the like, so that a final product is formed.
The application also provides a device for step hexagonal flange screw shaping, adopts step hexagonal flange screw shaping technology as described above, step hexagonal flange screw includes pole portion and from hexagonal head portion 52, hexagonal flange platform 53, first shaping pole 51, second shaping pole 57, third shaping pole 54 and fourth shaping pole 55 that set gradually of one end of pole portion, first shaping pole 51 with the side of the connecting portion of second shaping pole 57 is formed with recess 56. The device for forming the step hexagonal flange screw comprises a hexagon head 52 for cutting wires and forming the step hexagonal flange screw, a hexagon flange table 53, a cold header for forming a rod, a tail cutting machine for cutting tails, a thread rolling machine for rolling threads, heat treatment equipment for heat treatment of the step hexagonal flange screw after thread rolling, and surface treatment equipment for surface treatment of the step hexagonal flange screw. The cold header is used for forming the shape and the size requirements of the step hexagonal flange screw before cutting, namely forming the hexagonal head 52, the hexagonal flange table 53 and the forming rod. The type of the cold header is CBP-105S. The cold header is 5 moulds and 5 punches, and the production speed is 65 per minute. The tail cutting machine is used for cutting the tail of the fourth forming rod 55 so that the end part of the tail cutting machine is spherical. The thread rolling machine is used for forming the thread of the third forming rod 54, and the model is common in the market. The heat treatment equipment is used for carrying out heat treatment on the stepped hexagonal flange screw after the screw threads are formed. The surface treatment equipment comprises procedures of coating, packaging and the like for the stepped hexagonal flange screw.
Specifically, in this embodiment, the cold header (not labeled in the drawing) includes a feeding unit, a cutting unit, a conveying unit, and five dies, where the five dies include a main die and a die set corresponding to the main die, and are matched to complete the primary forming of the product, that is, to meet the shape and size requirements of the product before cutting the tail.
Specifically, in this embodiment, the thread rolling machine (not shown) includes a first thread rolling plate and a second thread rolling plate that are disposed opposite to each other, and the first thread rolling plate and the second thread rolling plate are displaced relatively in a horizontal direction, so that the stepped hexagonal flange screw is driven to rotate about its own axis, so that the outer surface of the third forming rod 54 is threaded.
Referring to fig. 7, the present application further provides a stepped hexagonal flange screw, which is manufactured by adopting the stepped hexagonal flange screw forming process as described above, and includes: a rod portion, and a hexagonal head portion 52, a hexagonal flange table 53, a first molding rod 51, a second molding rod 57, a third molding rod 54, and a fourth molding rod 55, which are sequentially provided from one end of the rod portion; the side surface of the connecting portion of the first and second molding bars 51 and 57 is formed with a groove 56, and the outer surface of the third molding bar 54 is formed with threads. Wherein the diameter of the first forming rod 51 is 6.7mm, and the length is 5mm; the second molding rod 57 has a diameter of 6.7mm and a length of 2.0mm; the third molding rod 54 has a diameter of 5.25mm and a length of 12mm; the fourth forming rod 55 has a diameter of 4.0mm and a length of 5.5mm. The second forming rod 57 is less in material consumption, less in material consumption and strict in rod portion, and the groove 56 formed on the side face of the connecting part of the first forming rod 51 and the second forming rod 57 is annular, so that the connecting part of the first forming rod 51 and the second forming rod 57 is rod-shaped, has the diameter of 6.0mm and the length of 12mm, and abandons the traditional machining forming process during processing, adopts cold heading die assembly for forming, saves raw materials, reduces the cooperation production among working procedures, effectively reduces the defective rate of products, and is suitable for mass production.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any changes, equivalents, modifications and improvements may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. A step hexagonal flange screw forming process, the step hexagonal flange screw includes a shank portion and a hexagonal head portion (52), a hexagonal flange table (53), a first forming rod (51), a second forming rod (57), a third forming rod (54) and a fourth forming rod (55) which are sequentially arranged from one end of the shank portion, a groove (56) is formed on a side surface of a connecting portion of the first forming rod (51) and the second forming rod (57), the step hexagonal flange screw forming process is characterized by comprising the following steps:
cutting the wire to form a blank (1);
reducing deformation is carried out on the blank (1) to form a first preformed part (2), a second preformed part (3) and a third preformed part (4) which are connected in sequence, wherein the diameters of the first preformed part (2), the second preformed part (3) and the third preformed part (4) are sequentially reduced;
stamping the first preform portion (2) to form a screw head blank and the first forming stem (51), stamping an end of the third preform portion (4) remote from the first preform portion (2) to form a chamfer;
-toe the screw head blank to form the hexagonal head (52);
after forming the hexagonal head (52), binding one end of the third preformed part (4) far away from the hexagonal head (52) to form the third forming rod (54) and a fourth forming rod (55), and stamping one end of the hexagonal head (52) near the second preformed part (3) to form the hexagonal flange table (53);
after the hexagonal flange table (53) is formed, placing the second preformed part (3) on a die for die assembly and pressing so as to form the groove (56) and the second forming rod (57);
after the grooves (56) and the second forming rods (57) are formed, the fourth forming rods (55) are cut off, and the end parts of the fourth forming rods form spherical surfaces;
-threading the third forming bar (54) after cutting the fourth forming bar (55) to form threads on its outer surface;
after the threads are formed, the stepped hex flange screw is heat treated and surface treated.
2. A stepped hexagonal flange screw forming process according to claim 1, characterized in that in the step of placing the second preform portion (3) on a mold for clamping and press-fitting, further comprising the steps of:
-fixing the end of the fourth forming rod (55) remote from the hexagonal head (52) on a main die;
abutting the hexagonal head portion (52) against a die;
the main die is clamped relative to the die along the axial direction of the stepped hexagonal flange screw so as to apply a force to the second preformed part (3) to form the groove (56) and the second forming rod (57).
3. A stepped hexagonal flange screw forming process according to claim 1, characterized in that in step "threading the third forming bar (54) to form threads on its outer surface", it specifically comprises placing the third forming bar (54) on a threading machine that reciprocates relatively in a horizontal direction so that the third forming bar (54) rotates along its own axis to form threads.
4. A device for step hexagon flange screw forming using the step hexagon flange screw forming process according to claim 1, the step hexagon flange screw including a shank portion and a hexagon head portion (52), a hexagon flange table (53), a first forming rod (51), a second forming rod (57), a third forming rod (54), and a fourth forming rod (55) which are sequentially provided from one end of the shank portion, a groove (56) being formed in a side surface of a connection portion of the first forming rod (51) and the second forming rod (57), characterized by comprising: the device comprises a hexagon head (52) for cutting wires and forming the step hexagon flange screw, a hexagon flange table (53) and a cold header for forming a rod, a tail cutting machine for cutting tails, a thread rolling machine for rolling threads, heat treatment equipment for heat treatment of the step hexagon flange screw after thread rolling, and surface treatment equipment for surface treatment of the step hexagon flange screw.
5. The apparatus for forming stepped hexagonal flange screw according to claim 4, wherein the cold header comprises a feeding unit, a shearing unit, a conveying unit, and five dies each comprising a main die and a die provided corresponding to the main die.
6. The apparatus for forming a stepped hexagon flange screw according to claim 4, wherein the thread rolling machine comprises a first thread rolling plate and a second thread rolling plate which are disposed opposite to each other, and the first thread rolling plate and the second thread rolling plate are displaced relatively in a horizontal direction so as to rotate the stepped hexagon flange screw about its own axis.
7. A stepped hexagonal flange screw formed by the stepped hexagonal flange screw forming process according to claim 1, comprising:
a rod part, and a hexagonal head part (52), a hexagonal flange table (53), a first molding rod (51), a second molding rod (57), a third molding rod (54) and a fourth molding rod (55) which are sequentially arranged from one end of the rod part; a groove (56) is formed in the side surface of the connecting portion between the first molding rod (51) and the second molding rod (57).
8. The stepped hex flange screw of claim 7, wherein said recess (56) is annular.
9. The stepped hex flange screw of claim 7, wherein said third forming shank (54) is threaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030988.0A CN114367618B (en) | 2022-01-12 | 2022-01-12 | Step hexagonal flange screw forming process, device and step hexagonal flange screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030988.0A CN114367618B (en) | 2022-01-12 | 2022-01-12 | Step hexagonal flange screw forming process, device and step hexagonal flange screw |
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| Publication Number | Publication Date |
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| CN114367618A CN114367618A (en) | 2022-04-19 |
| CN114367618B true CN114367618B (en) | 2024-01-30 |
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| CN202210030988.0A Active CN114367618B (en) | 2022-01-12 | 2022-01-12 | Step hexagonal flange screw forming process, device and step hexagonal flange screw |
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| CN (1) | CN114367618B (en) |
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| Publication number | Publication date |
|---|---|
| CN114367618A (en) | 2022-04-19 |
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