CN113198955B - High-precision double-drum aluminum alloy rivet forming die - Google Patents
High-precision double-drum aluminum alloy rivet forming die Download PDFInfo
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- CN113198955B CN113198955B CN202110383957.9A CN202110383957A CN113198955B CN 113198955 B CN113198955 B CN 113198955B CN 202110383957 A CN202110383957 A CN 202110383957A CN 113198955 B CN113198955 B CN 113198955B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
- B21G3/00—Making pins, nails, or the like
- B21G3/005—Nails or pins for special purposes, e.g. curtain pins
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a high-precision double-drum aluminum alloy rivet forming die, which comprises: the mount, including movable mould, cover half, shedding mechanism and cooling mechanism in the mount, the cover half setting in the below of movable mould and the both ends of cover half respectively with the inner wall fixed connection of mount, the cover half is the V-arrangement structure of invering and the top surface both sides set up the shaping chamber that a plurality of vertically arranged respectively, the briquetting that uses with the shaping chamber cooperation is installed to the bottom surface of movable mould, shedding mechanism installs the interior bottom at the mount and is located the below of cover half. According to the invention, the air outlet nozzle and the guide pipe are used for continuously outputting the heat dissipation air and conveying the heat dissipation air into the forming cavity, the air guide cavity guides the air into the heat dissipation holes and cooperates with the heat dissipation air in the heat dissipation groove to dissipate heat of the fixed die, the air outlet nozzle is separated from the heat dissipation groove after the movable die moves upwards, the heat dissipation air blown out from the side wall of the air outlet nozzle is blown onto the pressing block to dissipate heat of the movable die of the pressing block machine, the heat dissipation quality is improved, and the service life of the die is prolonged.
Description
Technical Field
The invention relates to the technical field of rivet dies, in particular to a high-precision double-drum aluminum alloy rivet forming die.
Background
The mould is various moulds and tools for obtaining required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The processing of the appearance of an article is realized mainly through the change of the physical state of a formed material. Plain has the designation of "industrial mother".
The rivet is a nail-shaped object, and one end of the rivet is provided with a cap; in riveting, the riveted parts are connected by self-deformation or interference. Rivets are of many types and, regardless of the form, the earliest rivets were small pegs of wood or bone, and the earliest metal variants probably were the ancestors of the rivets we know today. Six wooden fan-shaped bodies of the external lines of the grooved wheel are riveted and fastened together by rivets for the times of Egyptian in bronze wares, and greeks successfully use bronze to cast a large statue and then rivet all the parts together by using the rivets, wherein the common rivets comprise a semi-circular head, a flat head, a semi-hollow rivet, a solid rivet, a countersunk head rivet, a self-plugging rivet and a hollow rivet, and the rivets are connected by utilizing self deformation.
At present, the following problems exist in the existing rivet mould: after the rivet is formed, the cooling speed of the rivet body and the die body is low, the cooling means is single, the local cooling is slow in the cooling process, the rivet forming quality and the service life of the die are influenced, and the rivet forming quality is influenced; the unloading speed is slow, and part of the rivets are still left in the forming groove after unloading. For this reason, a new scheme needs to be designed to give improvement.
Disclosure of Invention
The invention aims to provide a high-precision double-drum aluminum alloy rivet forming die, which solves the problems that the cooling speed of a rivet body and a die body is low after the rivet is formed, the cooling means is single, the local cooling is slow in the cooling process, the rivet forming quality and the service life of the die are influenced, and the rivet forming quality is influenced; the discharging speed is low, and partial rivets are still left in the forming groove after discharging, so that the practical use requirement is met.
In order to achieve the purpose, the invention provides the following technical scheme: a high accuracy double drum aluminum alloy rivet forming die includes: the fixed frame comprises a movable die, a fixed die, an unloading mechanism and a cooling mechanism, the fixed die is arranged below the movable die, two ends of the fixed die are fixedly connected with the inner wall of the fixed frame respectively, the fixed die is of an inverted V-shaped structure, two sides of the top surface of the fixed die are provided with a plurality of forming cavities which are longitudinally distributed respectively, the bottom surface of the movable die is provided with a pressing block which is matched with the forming cavities for use, the unloading mechanism is arranged at the inner bottom of the fixed frame and is positioned below the fixed die, the top of the fixed frame is provided with a pneumatic cylinder, and the output end of the pneumatic cylinder is connected with the movable die;
the cooling mechanism comprises a first air pump, a second air pump, an air guide cavity, a first heat dissipation hole, a second heat dissipation hole, a heat dissipation groove and an air outlet nozzle, wherein the air guide cavity, the first heat dissipation hole, the second heat dissipation hole and the air outlet nozzle are arranged inside the fixed die, the first air pump is arranged in the middle of the top surface of the fixed frame, the output end of the first air pump is connected with the air outlet nozzle through a flexible hose, the second air pump is arranged in the middle of the inner bottom surface of the fixed frame, the output end of the second air pump is connected with two guide pipes, and the tail ends of the guide pipes are communicated with the air guide cavity respectively.
As a preferred embodiment of the invention, two sides of the surface of the fixed die are also longitudinally provided with movable holes, the air guide cavity is positioned between the movable holes and the forming cavity, the air guide cavity is in a semi-cylindrical structure, the arc-shaped surface is provided with a plurality of first heat dissipation holes, the upper ends of the first heat dissipation holes extend to the top surface of the fixed die and form an opening, and the first heat dissipation holes are obliquely arranged and form an included angle of 60 degrees with the top surface of the fixed die.
As a preferred embodiment of the invention, the heat dissipation groove is formed in the middle of the top surface of the fixed die and vertically extends downwards to the central position of the fixed die, the heat dissipation groove is columnar and is arranged in a straight line with the forming cavities on two sides, a plurality of second heat dissipation holes are respectively formed in two side walls of the heat dissipation groove, the second heat dissipation holes are inclined and are horizontal to the top surface of the fixed die, and the plurality of second heat dissipation holes are longitudinally arranged and the tail ends of the second heat dissipation holes are respectively communicated with the forming cavities.
As a preferred embodiment of the present invention, the air outlet nozzle is of a cylindrical structure, the surface of the air outlet nozzle is uniformly provided with a plurality of air holes distributed annularly, and the middle of the bottom surface of the air outlet nozzle is further provided with an air outlet hole.
As a preferred embodiment of the invention, the discharging mechanism comprises a push plate, a connecting rod, a top rod and a second spring, the push plate is of an inverted V-shaped structure, the unfolding angle of the push plate is the same as that of the fixed die, the connecting rod is vertically arranged on two sides of the top surface of the push plate and located below the movable hole, the upper end of the connecting rod extends into the movable hole and is connected with a metal plate, the top rod is arranged on two sides of the top surface of the push plate and located below the forming cavity, and the upper end of the top rod extends to the bottom surface of the forming cavity.
As a preferred embodiment of the invention, two sides of the movable mold are respectively provided with a buffer mechanism, the buffer mechanism comprises a limiting plate, a connecting rod, a magnetic plate and a first spring, the surface of the movable mold is provided with a buffer hole, the buffer hole is arranged corresponding to the movable hole, the connecting rod is movably connected in the movable hole, two ends of the connecting rod respectively extend out of the movable hole, the upper end of the connecting rod is connected with the limiting plate, the lower end of the connecting rod is connected with the magnetic plate, and the spring is sleeved on the connecting rod, and two ends of the spring are respectively connected with the bottom surface of the limiting plate and the top surface of the movable mold.
As a preferred embodiment of the invention, two buffer blocks are mounted on the inner wall of the movable hole, the buffer blocks are in an annular structure and made of rubber materials, the cross section of each buffer block is in an isosceles trapezoid structure, and the protruding end of the inner wall of each buffer block is attached to the surface of the connecting rod.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, a heat dissipation air source is provided by two air pumps, heat dissipation air is continuously output by the air outlet nozzle and the guide pipe, the air outlet nozzle is embedded into the heat dissipation groove and conveys the heat dissipation air to the heat dissipation groove after the movable die moves downwards, the heat dissipation groove is communicated with the heat dissipation holes and conveys the heat dissipation air to the molding cavity to dissipate heat of the molding cavity and the rivets molded in the molding cavity, meanwhile, the guide pipe outputs the heat dissipation air to the air guide cavity, the air guide cavity guides the air into the heat dissipation holes and cooperates with the heat dissipation air in the heat dissipation groove to dissipate heat of the fixed die, the air outlet nozzle is separated from the heat dissipation groove after the movable die moves upwards, the heat dissipation air blown out from the side wall of the air outlet nozzle is blown onto the pressing block to dissipate heat of the movable die of the pressing block machine, the heat dissipation quality is increased, and the service life of the die is prolonged.
(2) The movable mould moves down the back and drives buffer gear, buffer gear lower extreme magnetic sheet removes in the movable hole and adsorbs with the metal sheet, thereby the movable mould shifts up and stimulates the metal sheet and drives the push pedal after the rivet shaping, it is ejecting to come the rivet after the shaping through the ejector pin after moving on the push pedal, play automatic discharge's effect, when unloading, the air that blows off that goes out the air cock shifts up flows to both sides along cover half top surface slope, certain promotion effect has been played the rivet, and when the rivet moved to air guide chamber top, the air that blows off through a louvre has played the helping hand effect to the rivet, accelerate the rivet to both sides translation rate, the radiating effect has played many times to the rivet simultaneously.
Drawings
FIG. 1 is a structural diagram of a high-precision double-drum aluminum alloy rivet forming die according to the invention;
FIG. 2 is a block diagram of the moving mold of the present invention;
FIG. 3 is a structural view of the stationary mold according to the present invention;
fig. 4 is a structural view of the discharging mechanism of the present invention.
In the figure, 1, a fixing frame; 2. moving the mold; 3. fixing a mold; 4. a pneumatic cylinder; 5. a first air pump; 6. a discharge mechanism; 7. a second air pump; 8. a conduit; 9. a limiting plate; 10. an air outlet nozzle; 11. pressing into blocks; 12. air holes; 13. a first spring; 14. a buffer hole; 15. a connecting rod; 16. a buffer block; 17. a magnetic plate; 18. a first heat dissipation hole; 19. a second heat dissipation hole; 20. a heat sink; 21. a molding cavity; 22. a gas-conducting cavity; 23. a movable hole; 24. a metal plate; 25. a second spring; 26. pushing the plate; 27. a top rod; 28. a connecting rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a high accuracy double drum aluminum alloy rivet forming die includes: the rivet forming machine comprises a fixed frame 1, wherein the fixed frame 1 comprises a movable die 2, a fixed die 3, a discharging mechanism 6 and a cooling mechanism, the fixed die 3 is arranged below the movable die 2, two ends of the fixed die 3 are fixedly connected with the inner wall of the fixed frame 1 respectively, the fixed die 3 is of an inverted V-shaped structure, two sides of the top surface of the fixed die 3 are provided with a plurality of forming cavities 21 which are longitudinally distributed respectively, the bottom surface of the movable die 2 is provided with a pressing block 11 which is matched with the forming cavities 21 for use, rivet raw materials in the forming cavities 21 are formed through the pressing block 11 after the movable die 2 moves downwards, the discharging mechanism 6 is arranged at the inner bottom of the fixed frame 1 and is positioned below the fixed die 3, the top of the fixed frame 1 is provided with a pneumatic cylinder 4, the output end of the pneumatic cylinder 4 is connected with the movable die 2, and the pneumatic pump provides thrust for the movable die 2;
the cooling mechanism includes air pump one 5, two 7 air pumps and set up in the inside air guide chamber 22 of cover half 3, louvre one 18, louvre two 19, radiating groove 20 and install the play air cock 10 at 2 bottom surface middle parts of movable mould, air pump one 5 is installed and is adopted flexible hose and go out the air cock 10 to be connected at the top surface middle part of mount 1 and output, air pump two 7 are installed and are connected with two pipes 8 on the interior bottom surface middle part of mount 1 and the output, the end of pipe 8 communicates with air guide chamber 22 respectively, come movable mould 2 through the cooling mechanism, cover half 3 and the rivet after the shaping dispels the heat.
In a further improvement, as shown in fig. 2-3: the surface both sides of cover half 3 have still vertically seted up the activity hole 23, air guide cavity 22 is located between activity hole 23 and the shaping chamber 21, a plurality of louvres 18 have been seted up on air guide cavity 22 is the semi-cylindrical structure and the arcwall face, the upper end of louvre 18 extends to the top surface of cover half 3 and forms the opening, louvre 18 is the slope setting and is 60 degrees contained angles with the top surface of cover half 3, the inside air that blows off of louvre 18 plays the radiating effect to the rivet, still have the effect of promotion helping hand to the rivet in the while. The heat dissipation groove 20 is opened up in the top surface middle part of cover half 3 and vertical downwardly extending to the central individual position of cover half 3, the heat dissipation groove 20 is the column and is the in-line with the shaping chamber 21 of both sides and arranges, a plurality of louvre two 19 have been seted up on the both sides wall of heat dissipation groove 20 respectively, louvre two 19 are the slope form and with 3 top surface levels of cover half, a plurality of louvre two 19 vertically arrange and the end communicates with shaping chamber 21 respectively, air entering louvre two 19 in the heat dissipation groove 20 comes to cool down shaping chamber 21 and rivet. The air outlet 10 is of a cylindrical structure, the surface of the air outlet 10 is uniformly provided with a plurality of air holes 12 which are distributed in an annular mode, the air outlet 12 is further formed in the middle of the bottom surface of the air outlet 10, air is blown into the heat dissipation groove 20 after the air outlet 10 is contacted with the heat dissipation groove 20, and the air is blown to the periphery after the air outlet 10 is separated from the heat dissipation groove 20 to cool the surrounding environment and the movable mold 2.
Further improved, as shown in fig. 4: the discharging mechanism 6 comprises a push plate 26, a connecting rod 28, a top rod 27 and a second spring 25, the push plate 26 is an inverted V-shaped structure, the unfolding angle of the push plate 26 is the same as that of the fixed die 3, the connecting rod 28 is vertically arranged on two sides of the top surface of the push plate 26 and located below the movable hole 23, the upper end of the connecting rod 28 extends into the movable hole 23 and is connected with a metal plate 24, the top rod 27 is arranged on two sides of the top surface of the push plate 26 and located below the forming cavity 21, the upper end of the top rod 27 extends to the bottom surface of the forming cavity 21, the discharging mechanism 6 is driven by a buffer mechanism to move upwards, and rivets in the forming cavity 21 are pushed out through the top rod 27.
Further improved, as shown in fig. 2: the both sides of movable mould 2 are provided with buffer gear respectively, buffer gear includes limiting plate 9, connecting rod 15, a magnetic sheet 17 and spring 13, buffer hole 14 and the corresponding setting of activity hole 23 have been seted up on the surface of movable mould 2, connecting rod 15 swing joint is in activity hole 23 and both ends extend to activity hole 23 respectively outward, connecting rod 15's upper end is connected with limiting plate 9, the lower extreme is connected with magnetic sheet 17, a spring 13 cup joints on connecting rod 15 and both ends are connected with limiting plate 9 bottom surface and movable mould 2 top surface respectively, magnetic sheet 17 has certain impact force after 24 contacts with metal sheet, play the buffering effect through a spring 13 and buffer block 16.
Specifically, install two buffer blocks 16 on the activity hole 23 inner wall, buffer block 16 is the loop configuration and adopts rubber materials to make, and buffer block 16's cross-section is the laminating of the surface of isosceles trapezoid structure and the protruding end of inner wall and connecting rod 15, and buffer block 16 plays the effect of buffering to connecting rod 15 after contacting with connecting rod 15.
When the rivet forming machine is used, a heat dissipation air source is provided through the two air pumps, heat dissipation air is continuously output through the air outlet nozzle 10 and the guide pipe 8, after the moving die 2 moves downwards, the air outlet nozzle 10 is embedded into the heat dissipation groove 20 and conveys the heat dissipation air to the heat dissipation groove 20, the heat dissipation groove 20 is communicated with heat dissipation holes and conveys the heat dissipation air to the forming cavity 21, heat dissipation is performed on the forming cavity 21 and rivets formed in the forming cavity 21, meanwhile, the guide pipe 8 outputs the heat dissipation air to the air guide cavity 22, the air guide cavity 22 guides the air into the heat dissipation holes and is matched with the heat dissipation air in the heat dissipation groove 20 to dissipate heat of the fixed die 3, after the moving die 2 moves upwards, the air outlet nozzle 10 is separated from the heat dissipation groove 20, the heat dissipation air blown from the side wall of the air outlet nozzle 10 is blown onto the pressing block 11 to dissipate heat of the moving die 2 of the pressing block 11, the heat dissipation quality is improved, and the service life of the die is prolonged; the movable mould 2 moves down and then drives the buffer gear, the magnetic plate 17 at the lower end of the buffer gear moves to the movable hole 23 and adsorbs the metal plate 24, the movable mould 2 moves up and pulls the metal plate 24 after the rivet is formed so as to drive the push plate 26, the formed rivet is ejected out through the ejector rod 27 after the push plate 26 moves up, the automatic discharging effect is achieved, when discharging is achieved, air blown out by the air outlet nozzle 10 moves up and flows to two sides along the slope of the top surface of the fixed mould 3, a certain pushing effect is achieved on the rivet, when the rivet moves to the position above the air guide cavity 22, the air blown out through the heat dissipation hole 18 plays a power assisting role on the rivet, the moving speed of the rivet to two sides is accelerated, and meanwhile, the effect of multiple heat dissipation is achieved on the rivet.
Finally, it should be noted that: 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 changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A high accuracy two drum aluminum alloy rivet forming die includes: mount (1), its characterized in that: the automatic feeding device is characterized in that the fixed frame (1) comprises a movable die (2), a fixed die (3), an unloading mechanism (6) and a cooling mechanism, the fixed die (3) is arranged below the movable die (2), two ends of the fixed die (3) are fixedly connected with the inner wall of the fixed frame (1) respectively, the fixed die (3) is of an inverted V-shaped structure, a plurality of forming cavities (21) which are longitudinally distributed are formed in two sides of the top surface of the fixed die (3), a pressing block (11) matched with the forming cavities (21) for use is installed on the bottom surface of the movable die (2), the unloading mechanism (6) is installed at the inner bottom of the fixed frame (1) and located below the fixed die (3), a pneumatic cylinder (4) is installed at the top of the fixed frame (1), and the output end of the pneumatic cylinder (4) is connected with the movable die (2);
the cooling mechanism comprises a first air pump (5), a second air pump (7), an air guide cavity (22), a first heat dissipation hole (18), a second heat dissipation hole (19), a heat dissipation groove (20) and an air outlet nozzle (10) which is arranged in the middle of the bottom surface of the fixed die (3), the first air pump (5) is arranged in the middle of the top surface of the fixed die (1), the output end of the first air pump is connected with the air outlet nozzle (10) through a flexible hose, the second air pump (7) is arranged in the middle of the inner bottom surface of the fixed die (1), the output end of the second air pump is connected with two guide pipes (8), and the tail ends of the guide pipes (8) are respectively communicated with the air guide cavity (22);
both sides of the surface of the fixed die (3) are also longitudinally provided with movable holes (23), the air guide cavity (22) is positioned between the movable holes (23) and the forming cavity (21), the air guide cavity (22) is of a semi-cylindrical structure, a plurality of first heat dissipation holes (18) are formed in the arc-shaped surface, the upper ends of the first heat dissipation holes (18) extend to the top surface of the fixed die (3) to form an opening, and the first heat dissipation holes (18) are obliquely arranged and form an included angle of 60 degrees with the top surface of the fixed die (3);
the heat dissipation structure is characterized in that the heat dissipation groove (20) is arranged in the middle of the top surface of the fixed die (3) and vertically extends downwards to the center of the fixed die (3), the heat dissipation groove (20) is columnar, a plurality of heat dissipation holes two (19) are formed in two side walls of the heat dissipation groove (20) respectively, the heat dissipation holes two (19) are inclined and horizontal to the top surface of the fixed die (3), and the heat dissipation holes two (19) are longitudinally arranged and the tail ends of the heat dissipation holes two (19) are communicated with the forming cavity (21) respectively.
2. The high-precision double-drum aluminum alloy rivet forming die as recited in claim 1, wherein: the air outlet nozzle (10) is of a cylindrical structure, a plurality of air holes (12) distributed annularly are uniformly formed in the surface of the air outlet nozzle, and an air outlet hole is formed in the middle of the bottom surface of the air outlet nozzle (10).
3. The high-precision double-drum aluminum alloy rivet forming die as claimed in claim 1, wherein: discharge mechanism (6) are including push pedal (26), connecting rod (28), ejector pin (27) and spring two (25), push pedal (26) are the V-arrangement structure of invering and expand the angle the same with cover half (3), connecting rod (28) are vertical to be installed in the top surface both sides of push pedal (26) and are located the below in activity hole (23), and the upper end of connecting rod (28) extends to in activity hole (23) and is connected with metal sheet (24), ejector pin (27) are installed in the top surface both sides of push pedal (26) and are located the below in shaping chamber (21), and the upper end of ejector pin (27) extends to shaping chamber (21) bottom surface.
4. The high-precision double-drum aluminum alloy rivet forming die as recited in claim 1, wherein: the both sides of movable mould (2) are provided with buffer gear respectively, buffer gear includes limiting plate (9), connecting rod (15), magnetic sheet (17) and spring (13), buffer hole (14) and buffer hole (14) are seted up on the surface of movable mould (2) and are corresponded the setting with activity hole (23), connecting rod (15) swing joint is in activity hole (23) and both ends extend to activity hole (23) respectively outward, and the upper end and limiting plate (9) of connecting rod (15) are connected, the lower extreme is connected with magnetic sheet (17), spring (13) cup joint on connecting rod (15) and both ends are connected with limiting plate (9) bottom surface and movable mould (2) top surface respectively.
5. The high-precision double-drum aluminum alloy rivet forming die as claimed in claim 4, wherein: install two buffer blocks (16) on activity hole (23) inner wall, buffer block (16) are the loop configuration and adopt rubber materials to make, and the cross-section of buffer block (16) is the surface laminating of isosceles trapezoid structure and inner wall protruding end and connecting rod (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383957.9A CN113198955B (en) | 2021-04-09 | 2021-04-09 | High-precision double-drum aluminum alloy rivet forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383957.9A CN113198955B (en) | 2021-04-09 | 2021-04-09 | High-precision double-drum aluminum alloy rivet forming die |
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| CN113198955A CN113198955A (en) | 2021-08-03 |
| CN113198955B true CN113198955B (en) | 2022-11-04 |
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| CN111069484A (en) * | 2019-12-10 | 2020-04-28 | 萍乡市鸿安五金制品有限公司 | Strip nail blanking device |
| CN210547460U (en) * | 2019-08-27 | 2020-05-19 | 广州奥太制冷设备有限公司 | Reposition of redundant personnel head stamping die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008049381A (en) * | 2006-08-28 | 2008-03-06 | Nissan Motor Co Ltd | Mold clamping device for die set |
| KR20120039901A (en) * | 2010-10-18 | 2012-04-26 | 현대자동차주식회사 | Forming apparatus of part |
| CN103357764A (en) * | 2013-07-24 | 2013-10-23 | 陈扬 | Cooling-gas direct cooling process and device based on hot forming mould of boron steel plate |
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| CN113198955A (en) | 2021-08-03 |
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