A stamping device for processing piezoelectric ceramics with easily adjustable diameter

Abstract

This utility model discloses a stamping device for processing piezoelectric ceramics with easily adjustable diameter. It includes a support plate and a movable component between the support plate and the operating table. By controlling a first electro-hydraulic push rod to move the support plate to the left, the support plate can move the second lower die and the second upper stamping die directly below the stamping head for use. Conversely, the support plate can move the first lower die and the first upper stamping die directly below the stamping head for use. This allows operators to easily adjust and switch between two different sizes of the first and second lower dies. By controlling a second electro-hydraulic push rod to move a locking plug backward and insert it into the first locking socket, the support plate moved to the right can be locked. Similarly, when the second electro-hydraulic push rod moves the locking plug backward and inserts it into the second locking socket, the support plate moved to the left can be locked.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric ceramic blank stamping technology, specifically a stamping device for processing piezoelectric ceramics with easily adjustable diameter. Background Technology

[0002] Piezoelectric ceramics are a type of information-functional ceramic material that can convert mechanical energy and electrical energy into each other – the piezoelectric effect. In addition to piezoelectricity, piezoelectric ceramics also have dielectric properties and elasticity. In the processing of piezoelectric ceramics, a stamping device is needed to stamp the unsintered piezoelectric ceramic blank (a mixture of ceramic powder and binder) into a disc shape.

[0003] In existing piezoelectric ceramic blank stamping devices, the upper and lower molds are single, fixed-size units. This means that only one diameter piezoelectric ceramic blank can be pressed during use. When a different diameter piezoelectric ceramic blank needs to be pressed, the operator must first disassemble the original upper and lower molds and then install and fix the new molds onto the stamping device. This replacement method is time-consuming and labor-intensive, and operators cannot easily adjust and switch between two different sizes of upper and lower molds. Its practicality needs further improvement. Utility Model Content

[0004] The purpose of this invention is to provide a stamping device for processing piezoelectric ceramics with easily adjustable diameter, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A stamping device for processing piezoelectric ceramics with easily adjustable diameter includes an operating table, a support plate, a first lower die body, a hydraulic cylinder, a support frame, a stamping head, a first pressure seat, a first top plate, a first limiting post, and a first upper stamping die body. The support plate is attached to the upper surface of the operating table. The first lower die body is fixedly connected to the left side of the upper surface of the support plate. The first upper stamping die body is positioned directly above the first lower die body. A first top plate is located on the upper surface of the first upper stamping die body. A first pressure seat is fixedly connected to the middle position of the upper surface of the first top plate. The support frame is fixedly connected to the rear side of the upper surface of the operating table. A hydraulic cylinder is mounted on the front side of the upper surface of the support frame. A stamping head is mounted on the lower end of the hydraulic cylinder. A first limiting post is fixedly connected to the left side of the upper surface of the support plate. A first limiting post is fixedly connected to the right side of the upper surface of the support plate. A second lower die body is provided, and a second upper stamping die body is provided directly above the second lower die body. A second top plate is provided on the upper end face of the second upper stamping die body. A second pressure seat is fixedly connected to the middle position of the upper end face of the second top plate. A second limiting post is fixedly connected to the right side of the upper end face of the support plate. A return spring is fitted on the annular side of both the second limiting post and the first limiting post. Limiting through holes are symmetrically opened on the left and right sides inside the first and second top plates, and the limiting through holes are respectively matched with the first limiting post and the second limiting post. Anti-disengagement rings are fitted on the upper side of the annular side of both the first limiting post and the second limiting post. A moving component is provided between the support plate and the operating table, and the moving component is used to move the support plate laterally. A positioning component is provided on the side of the support plate, and the positioning component is used to position the support plate.

[0007] Preferably, the moving component includes a first electro-hydraulic push rod, a first support side plate, a limiting guide rail, and a limiting groove. The upper surface of the operating platform is fixedly connected to the limiting guide rail, and the lower surface of the support plate is provided with a limiting groove. The left side of the upper surface of the operating platform is fixedly connected to the first support side plate, and the first electro-hydraulic push rod is installed between the first support side plate and the support plate.

[0008] Preferably, the positioning component includes a left stop, a locking plug, a second electro-hydraulic push rod, a second support side plate, and a first locking hole. The second support side plate is fixedly connected to the front side of the upper end face of the operating platform. The second electro-hydraulic push rod is installed on the rear end face of the second support side plate. The locking plug is installed on the rear end of the second electro-hydraulic push rod. The left stop is installed on the left side of the upper end face of the operating platform. The first locking hole is opened on the left side of the front end face of the support plate.

[0009] Preferably, a second locking hole is provided on the right side of the front end face of the support plate, and both the second locking hole and the first locking hole are matched with the locking plug. The front and rear ends of the second support side plate are symmetrically and fixedly connected with a second reinforcing plate.

[0010] Preferably, the left and right ends of the first support side plate are symmetrically and fixedly connected with first reinforcing plates.

[0011] Preferably, the limiting guide rail is T-shaped, and the limiting groove matches the limiting guide rail.

[0012] Preferably, a reinforcing block is fixedly connected to the upper side of the inner wall of the support frame, and the reinforcing block is triangular in shape. The inner diameter of the first lower die is larger than the inner diameter of the second lower die. The first stamping upper die matches the first lower die, and the second stamping upper die matches the second lower die.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By controlling the first electro-hydraulic push rod to move the support plate to the left, the support plate can move the second lower die and the second upper stamping die to be used directly under the stamping head. When the first electro-hydraulic push rod is controlled to move the support plate to the right, the support plate can move the first lower die and the first upper stamping die to be used directly under the stamping head. This allows the operator to easily adjust and switch between the two different sizes of the first lower die and the first upper stamping die and the second lower die and the second upper stamping die. During this process, the limiting guide rail will limit and guide the support plate through the limiting groove to prevent the support plate from shaking or shifting during lateral movement.

[0015] 2. By installing the left stop, the leftward-moving support plate can be blocked and restricted, preventing excessive leftward movement. Similarly, the right stop can block and restrict the rightward-moving support plate, preventing excessive rightward movement. By controlling the second electro-hydraulic push rod to move the locking plug backward and insert it into the first locking socket, the rightward-moving support plate can be locked. Similarly, when the second electro-hydraulic push rod moves the locking plug backward and inserts it into the second locking socket, the leftward-moving support plate can be locked, preventing displacement of the support plate during the stamping process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a structural diagram of the moving component and the positioning component in this utility model;

[0018] Figure 3 This is a structural diagram of the support plate in this utility model;

[0019] Figure 4 This is a structural diagram of the first and second upper stamping dies in this utility model;

[0020] Figure 5 for Figure 2 A magnified view of A in the middle.

[0021] In the diagram: 1. Operating platform; 2. Moving component; 21. First electro-hydraulic push rod; 22. First support side plate; 23. First reinforcing plate; 24. Limiting guide rail; 25. Limiting groove; 3. Positioning component; 31. Left stop block; 32. Locking plug; 33. Second electro-hydraulic push rod; 34. Second support side plate; 35. Second reinforcing plate; 36. Right stop block; 37. First locking hole; 38. Second locking hole; 4. Support plate; 5. First lower mold body; 6. Second lower mold body; 7. Return spring; 8. Second limiting post; 9. Second pressure seat; 10. Second top plate; 11. Second stamping upper mold body; 12. Hydraulic cylinder; 13. Support frame; 131. Reinforcing block; 14. Stamping head; 15. First pressure seat; 16. First top plate; 17. First limiting post; 18. First stamping upper mold body; 19. Limiting through hole; 20. Anti-detachment ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5 This utility model provides a technical solution:

[0024] Example 1:

[0025] A stamping device for processing piezoelectric ceramics with easily adjustable diameter includes an operating table 1, a support plate 4, a first lower die body 5, a hydraulic cylinder 12, a support frame 13, a stamping head 14, a first pressure seat 15, a first top plate 16, a first limiting post 17, and a first upper stamping die body 18. The support legs at the bottom of the operating table 1 are fixed to a designated position on the ground by expansion bolts. The upper surface of the operating table 1 is attached to the support plate 4, and the lower surface of the support plate 4 is attached to the upper surface of the operating table 1. The support plate 4 is connected to the first lower die body 5, a second lower die body 6, the first limiting post 17, and the second limiting post. All 8 are integral structures. The support plate 4 can support the first lower mold body 5, the second lower mold body 6, the first limiting post 17 and the second limiting post 8 respectively. The first lower mold body 5 is fixedly connected to the left side of the upper end face of the support plate 4. The inner diameter of the first lower mold body 5 is larger than the inner diameter of the second lower mold body 6. The first stamping upper mold body 18 is set directly above the first lower mold body 5. The first stamping upper mold body 18 matches the first lower mold body 5. The matching first stamping upper mold body 18 and the first lower mold body 5 can press the piezoelectric ceramic blank into a large-diameter disc shape under the stamping pressure of the hydraulic cylinder 12.

[0026] A first top plate 16 is provided on the upper end face of the first stamping upper die 18. The first top plate 16, the first pressure seat 15, and the first stamping upper die 18 are all integral structures. The first top plate 16 can support the first pressure seat 15 and the first stamping upper die 18 respectively. The first pressure seat 15 is fixedly connected to the middle position of the upper end face of the first top plate 16. The first pressure seat 15 can increase the thickness and strength of the stamped area of ​​the first top plate 16, and prevent the first top plate 16 from easily deforming when subjected to the impact force of the descending stamping head 14. A support frame 13 is fixedly connected to the rear side of the upper end face of the operating table 1. The support frame 13 and the operating table 1 are connected by welding. The support frame 13 can support and fix the hydraulic cylinder 12. The hydraulic cylinder 12 is installed on the front side of the upper end of the support frame 13. The hydraulic cylinder 12 is physically connected to the external hydraulic station through a metal oil pipe or high-pressure hose to form a closed oil circuit system. This allows the operator to control the hydraulic cylinder 12 to perform up and down extension and pressing actions with the help of the external hydraulic station. Since the internal detailed structure and working principle of the hydraulic cylinder 12 are relatively mature technologies in the existing technology, they will not be described in detail here. The lower end of the hydraulic cylinder 12 is equipped with a pressing head 14. The pressing head 14 facilitates the hydraulic cylinder 12 to press the first pressure seat 15 or the second pressure seat 9 downward.

[0027] A first limiting post 17 is fixedly connected to the left side of the upper end face of the support plate 4. The first limiting post 17 can limit the first top plate 16 through the limiting through hole 19 to prevent the first top plate 16 from shifting or shaking during lifting and lowering. A second lower mold body 6 is fixedly connected to the right side of the upper end face of the support plate 4. A second stamping upper mold body 11 is set directly above the second lower mold body 6. The second stamping upper mold body 11 matches the second lower mold body 6. The matching second stamping upper mold body 11 and the second lower mold body 6 can press the piezoelectric ceramic blank into a small diameter disc shape under the stamping pressure of the hydraulic cylinder 12. A second top plate 10 is set on the upper end face of the second stamping upper mold body 11. The second top plate 10, the second pressure seat 9, and the second stamping upper mold body 11 are all integral structures. The second top plate 10 can support the second pressure seat 9 and the second stamping upper mold body 11 respectively.

[0028] A second pressure seat 9 is fixedly connected to the middle of the upper end face of the second top plate 10. The second pressure seat 9 can increase the thickness and strength of the stamped area of ​​the second top plate 10, and prevent the second top plate 10 from easily deforming when subjected to the impact force of the descending stamping head 14. A second limiting post 8 is fixedly connected to the right side of the upper end face of the support plate 4. The second limiting post 8 can limit the second top plate 10 through the limiting through hole 19, and prevent the second top plate 10 from deviating and swaying during the lifting and lowering process. The second limiting post 8 and the first limiting post 17 are both fitted with return springs 7 on their annular sides. The return springs 7 can apply upward compressive force to the first top plate 16 and the second top plate 10 respectively, so that the first top plate 16 and the second top plate 10 are not subjected to external force. The first top plate 16 and the second top plate 10 are symmetrically provided with limiting through holes 19 on the left and right sides of their interiors. These limiting through holes 19 are matched with the first limiting post 17 and the second limiting post 8, respectively. The limiting through holes 19 facilitate the insertion of the first limiting post 17 and the second limiting post 8 into the first top plate 16 and the second top plate 10 for limiting and guiding. The upper side of the annular side of the first limiting post 17 and the second limiting post 8 is fitted with an anti-slip ring 20. The anti-slip ring 20 can block and limit the first top plate 16 and the second top plate 10, preventing them from excessively moving upwards and slipping during use. High-strength bolts are installed inside the anti-slip ring 20. Figure 5 (As shown in the drawing), and high-strength bolts are fixed inside the anti-detachment retaining ring 20, which makes it easy for installers to disassemble and assemble the anti-detachment retaining ring 20.

[0029] A movable component 2 is provided between the support plate 4 and the operating table 1. The movable component 2 is used to move the support plate 4 laterally so that the operator can adjust the position of the first lower mold body 5 and the second lower mold body 6 laterally as needed, thereby adjusting the diameter of the piezoelectric ceramic blank. A positioning component 3 is provided on the side of the support plate 4. The positioning component 3 is used to position the support plate 4 to prevent the support plate 4 from shifting or shaking during use. A reinforcing block 131 is fixedly connected to the upper side of the inner wall of the support frame 13. The reinforcing block 131 is triangular in shape. The triangular reinforcing block 131 can further enhance the strength of the corner of the upper side of the inner wall of the support frame 13, preventing the support frame 13 from easily deforming or shaking during use.

[0030] The moving component 2 includes a first electro-hydraulic push rod 21, a first support side plate 22, a limiting guide rail 24, and a limiting groove 25. The limiting guide rail 24 is fixedly connected to the upper surface of the operating table 1. The limiting guide rail 24 is connected to the operating table 1 by welding. The limiting guide rail 24 is T-shaped. The lower surface of the support plate 4 has a limiting groove 25. The limiting groove 25 matches the limiting guide rail 24. The matching limiting groove 25 and the T-shaped limiting guide rail 24 can limit the support plate 4, preventing the support plate 4 from shifting or shaking during lateral movement. The first support side plate 22 is fixedly connected to the left side of the upper surface of the operating table 1. The first support side plate 22 is connected to the operating table 1 by welding. The first support side plate 22 can support the first electro-hydraulic push rod 21. The first electro-hydraulic push rod 21 is installed between the first support side plate 22 and the support plate 4. The first electro-hydraulic push rod 21 is electrically connected to the surrounding external control cabinet through wires (not shown in the figure). When working, the first electro-hydraulic push rod 21 can drive the support plate 4 to move laterally left and right. The left and right ends of the first support side plate 22 are symmetrically fixedly connected with the first reinforcing plate 23. The first reinforcing plate 23 can further improve the connection stability between the first support side plate 22 and the operating table 1.

[0031] Example 2:

[0032] Based on Embodiment 1, in this embodiment, by installing the left stop 31, the left-moving support plate 4 can be blocked and restricted, preventing the support plate 4 from moving excessively to the left. Similarly, the right stop 36 can be installed to block and restrict the right-moving support plate 4, preventing the support plate 4 from moving excessively to the right. By controlling the second electro-hydraulic push rod 33 to drive the locking plug 32 to move backward and insert it into the first locking socket, the right-moving support plate 4 can be locked. When the second electro-hydraulic push rod 33 drives the locking plug 32 to move backward and insert it into the second locking socket, the left-moving support plate 4 can be locked, preventing the support plate 4 from shifting during the stamping process of this device.

[0033] The positioning component 3 includes a left stop 31, a locking plug 32, a second electro-hydraulic push rod 33, a second support side plate 34, and a first locking hole 37. The second support side plate 34 is fixedly connected to the front side of the upper end of the operating table 1. The second support side plate 34 is connected to the operating table 1 by welding. The second support side plate 34 can support the second electro-hydraulic push rod 33. The second electro-hydraulic push rod 33 is installed on the rear end face of the second support side plate 34. The second electro-hydraulic push rod 33 is electrically connected to the surrounding external control cabinet through a wire (not shown in the figure). When working, the second electro-hydraulic push rod 33 can drive the locking plug 32 to move longitudinally back and forth.

[0034] The second electro-hydraulic push rod 33 has a locking plug 32 installed at its rear end. The locking plug 32 can lock the support plate 4, which has moved to the left or right position, through the first locking hole 37 or the second locking hole 38. A left stop block 31 is installed on the left side of the upper surface of the operating table 1. The left stop block 31 is a detachable structure and can block and limit the leftward movement of the support plate 4 to prevent it from moving too far to the left. A first locking hole 37 is opened on the left side of the front surface of the support plate 4. The first locking hole 37 facilitates the locking plug 32 to lock the support plate 4, which has moved to the right position. A second locking hole 38 is provided on the right side of the front end face 4. Both the second locking hole 38 and the first locking hole 37 are matched with the locking plug 32. The second locking hole 38 facilitates the locking plug 32 to lock the support plate 4 which has been moved to the left. The front and rear ends of the second support side plate 34 are symmetrically and fixedly connected with a second reinforcing plate 35. The second reinforcing plate 35 can further improve the connection stability between the second support side plate 34 and the operating table 1. An extension plate is provided on the right side of the annular side of the locking head. A reinforcing rod is provided on the front end face of the extension plate. The reinforcing rod is inserted into the interior of the second support side plate 34. Figure 1 and Figure 2 (All have been drawn in the middle) The extension plate, reinforcing rod and locking head are all integrated structures. The extension plate and reinforcing rod can further improve the stability of the locking head and prevent the locking head from shaking or loosening during use.

[0035] Working principle: In the processing of piezoelectric ceramics, this device is used to press and shape unsintered piezoelectric ceramic blanks (a mixture of ceramic powder and binder). (Refer to...) Figure 1 The workers first pour the prepared piezoelectric ceramic blank into the first lower mold body 5. Then, the hydraulic cylinder 12 controls the punch head 14 to descend, so that the punch head 14 drives the first upper stamping mold body 18 to descend through the first pressure seat 15 and the first top plate 16 to press the piezoelectric ceramic blank in the first lower mold body 5 into shape. After pressing, the hydraulic cylinder 12 drives the punch head 14 to move up to the initial position. During this process, the return spring 7 will apply an upward squeezing force to the first top plate 16, so that the first top plate 16 drives the first upper stamping mold body 18 to move up to the initial position together, so that the workers can use an external suction cup tool to take out the piezoelectric ceramic blank pressed into a disc shape from the first lower mold body 5.

[0036] When the piezoelectric ceramic blank needs to be pressed into a small-diameter disc shape using the second lower mold body 6, the operator first controls the second electro-hydraulic push rod 33 to move the locking plug 32 forward and separate it from the first locking hole 37. Then, the operator controls the first electro-hydraulic push rod 21 to move the support plate 4 to the left. The support plate 4 will then move the second lower mold body 6 and the second upper stamping mold body 11 to be directly below the stamping head 14 for use, so that the operator can easily adjust the pressing diameter of the device. During this process, the left stop block 31 will block and limit the leftward movement of the support plate 4 to prevent it from moving too far to the left. When the support plate 4 moves to the left and contacts the left stop block 31, the operator then controls the second electro-hydraulic push rod 33 to move the locking plug 32 backward and insert it into the second locking hole 38 (see reference). Figure 2 The locking plug 32 locks the support plate 4 through the second locking hole 38 to prevent the support plate 4 from shifting laterally again. The limiting guide rail 24 and the limiting groove 25 limit and guide the support plate 4 to prevent it from shaking or shifting during use, thus ensuring the stability of the support plate 4. Then, the operator pours the prepared piezoelectric ceramic blank into the second lower mold body 6. Then, the hydraulic cylinder 12 drives the stamping head 14 to descend, which allows the second stamping upper mold body 11 to descend and press the piezoelectric ceramic blank in the second lower mold body 6 into a small diameter disc-shaped structure.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stamping device for processing piezoelectric ceramics with easily adjustable diameter, comprising an operating table (1), a support plate (4), a first lower die body (5), a hydraulic cylinder (12), a support frame (13), a stamping head (14), a first pressure seat (15), a first top plate (16), a first limiting post (17), and a first upper stamping die body (18), characterized in that: The upper surface of the operating table (1) is attached to a support plate (4). A first lower mold body (5) is fixedly connected to the left side of the upper surface of the support plate (4). A first stamping upper mold body (18) is set directly above the first lower mold body (5). A first top plate (16) is set on the upper surface of the first stamping upper mold body (18). A first pressure seat (15) is fixedly connected to the middle position of the upper surface of the first top plate (16). A support frame (13) is fixedly connected to the rear side of the upper surface of the operating table (1). A hydraulic cylinder (12) is installed on the front side of the upper surface of the support frame (13). A stamping head (14) is installed at the lower end of the hydraulic cylinder (12). A first limiting post (17) is fixedly connected to the left side of the upper surface of the support plate (4). The support plate (4) is fixedly connected to the right side of the upper end face of the second lower mold body (6). The second stamping upper mold body (11) is set directly above the second lower mold body (6). The upper end face of the second stamping upper mold body (11) is provided with a second top plate (10). The middle position of the upper end face of the second top plate (10) is fixedly connected with a second pressure seat (9). The right side of the upper end face of the support plate (4) is fixedly connected with a second limiting post (8). The annular side of the second limiting post (8) and the first limiting post (17) are both fitted with a reset spring (7). The left and right sides of the first top plate (16) and the second top plate (10) are symmetrically opened with limiting through holes (19). The limiting through holes (19) are matched with the first limiting post (17) and the second limiting post (8) respectively. The upper side of the annular side of the first limiting post (17) and the second limiting post (8) is fitted with an anti-disengagement ring (20). A moving component (2) is provided between the support plate (4) and the operating table (1), and the moving component (2) is used to move the support plate (4) laterally. A positioning component (3) is provided on the side of the support plate (4), and the positioning component (3) is used to position the support plate (4).

2. The stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 1, characterized in that: The moving component (2) includes a first electro-hydraulic push rod (21), a first support side plate (22), a limiting guide rail (24), and a limiting groove (25). The upper end face of the operating table (1) is fixedly connected to the limiting guide rail (24), and the lower end face of the support plate (4) is provided with a limiting groove (25). The left side of the upper end face of the operating table (1) is fixedly connected to the first support side plate (22), and the first electro-hydraulic push rod (21) is installed between the first support side plate (22) and the support plate (4).

3. The stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 1, characterized in that: The positioning component (3) includes a left stop (31), a locking plug (32), a second electro-hydraulic push rod (33), a second support side plate (34), and a first locking hole (37). The second support side plate (34) is fixedly connected to the front side of the upper end face of the operating table (1). The second electro-hydraulic push rod (33) is installed on the rear end face of the second support side plate (34). The locking plug (32) is installed on the rear end of the second electro-hydraulic push rod (33). The left stop (31) is installed on the left side of the upper end face of the operating table (1). The first locking hole (37) is opened on the left side of the front end face of the support plate (4).

4. A stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 3, characterized in that: The support plate (4) has a second locking hole (38) on the right side of its front end face. The second locking hole (38) and the first locking hole (37) are both matched with the locking plug (32). The second support side plate (34) has a second reinforcing plate (35) symmetrically fixedly connected to its front and rear ends.

5. A stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 2, characterized in that: The first supporting side plate (22) has a first reinforcing plate (23) symmetrically fixedly connected to its left and right ends.

6. A stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 2, characterized in that: The limiting guide rail (24) is T-shaped, and the limiting groove (25) matches the limiting guide rail (24).

7. A stamping device for processing piezoelectric ceramics with easily adjustable diameter according to claim 1, characterized in that: A reinforcing block (131) is fixedly connected to the upper side of the inner wall of the support frame (13), and the reinforcing block (131) is triangular in shape. The inner diameter of the first lower die (5) is larger than the inner diameter of the second lower die (6). The first stamping upper die (18) matches the first lower die (5), and the second stamping upper die (11) matches the second lower die (6).

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