Negative angle product bending die

Abstract

The utility model discloses a negative angle product bending die relates to the field of sheet material processing, it includes die holder, the die holder includes upper die holder and lower die holder, is equipped with vertical rod between upper die holder and lower die holder, and vertical rod penetrates upper die holder and is fixedly connected with lower die holder, and the lower extreme of upper die holder is equipped with the locating plate, is equipped with the punching block on the locating plate, is equipped with the locating block on lower die holder, is equipped with the locating rod on upper die holder, is equipped with the locating hole and the fixed hole corresponding with punching block on the locating block corresponding with the locating rod, is equipped with the shaping punch on upper die holder, is equipped with the shaping female die on lower die holder, and the shaping punch includes shaping plate and shaping rod, and shaping rod is located the both sides of shaping plate along the length direction, and the shaping female die includes shaping base and shaping block, and shaping block is located the both sides of shaping base along the length direction. The present application has the effect of improving device work stability.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal processing, and in particular to bending dies for negative angle products. Background Technology

[0002] Currently, in the process of sheet metal processing, it is often necessary to bend the sheet metal. Traditional equipment usually uses two or more workpieces to squeeze and bend the sheet metal to the required angle to meet the working conditions.

[0003] Related technology can be found in Chinese Patent No. CN223159875U, which discloses a sheet metal bending device, including a processing table, a fixed base mounted on the top of the processing table, an mounting base mounted on the top of the fixed base, a conversion template detachably connected to the mounting base, and a bending mechanism for bending the sheet metal mounted on the top of the fixed base. By installing a fixed base on the processing table, a mounting base on the fixed base, and a conversion template mounted on the mounting base, the conversion template is provided with a conical mold groove and a small rounded corner groove. The conical mold groove and the small rounded corner groove can be switched. When the conical mold groove is in the upper position, a pressure block with a conical bottom is mounted on the connecting base to process sheet metal with conical angles. When the small rounded corner groove is in the upper position, a pressure block with a rounded bottom is mounted on the connecting base to process sheet metal with small rounded corners, thus enabling the processing of sheet metal with different angles while reducing manufacturing costs.

[0004] Regarding the aforementioned technologies, when the device bends the sheet metal, the sheet metal has a large range of motion and a high degree of mobility, which makes it easy for the sheet metal to wobble and misalign, affecting the processing effect and hindering the improvement of the device's stability when processing the sheet metal. Utility Model Content

[0005] To improve the operational stability of the device, this application provides a negative angle product bending die.

[0006] This application provides a negative angle product bending die, adopting the following technical solution: A negative angle product bending die, including a die base, on which a shaping die and a shaping punch that open and close vertically, further comprising: The punching mechanism is located at the beginning of the die base. When the sheet metal passes through the punching mechanism, the punching mechanism punches through holes in the sheet metal. The feeding mechanism is used to convey sheet metal to the shaping die and the shaping punch. When the feeding mechanism is working, it drives the sheet metal from the punching mechanism to be conveyed between the shaping die and the shaping punch. The positioning block is located at the lower end of the mold base. The upper end of the positioning block is provided with a positioning hole corresponding to the through hole of the plate. The mold base is also provided with a positioning rod corresponding to the positioning hole. During the closing process of the shaping die and the shaping punch, the positioning rod passes through the through hole on the plate and is located in the positioning hole. The positioning rod abuts against the inner wall of the through hole of the plate. At this time, the part of the plate that needs to be bent is located between the shaping die and the shaping punch.

[0007] By adopting the above technical solution, under the support of the mold base, the feeding mechanism transports the sheet metal from the punching mechanism to between the shaping die and the shaping punch. The punching mechanism punches through holes in the sheet metal. When the sheet metal is transported to the designated position, the positioning rod passes through the positioning block and is inserted into the positioning hole. The positioning rod and the positioning block cooperate to fix and limit the sheet metal. At this time, the shaping die and the shaping punch cooperate to bend the sheet metal, which helps to improve the stability of the device when bending the sheet metal.

[0008] Optionally, the mold base includes an upper mold base and a lower mold base, with a plurality of vertical rods provided between the upper mold base and the lower mold base. The vertical rods pass through the upper mold base vertically and are fixedly connected to the lower mold base. The upper mold base moves closer to or away from the lower mold base along the height direction of the vertical rods. A shaping punch is located at the lower end of the upper mold base, and a shaping die is detachably connected to the upper end of the lower mold base. The shaping punch moves closer to or away from the shaping die as the upper mold base moves closer to or away from the shaping die.

[0009] By adopting the above technical solution, under the support of the lower mold base, the vertical rod guides and limits the vertical displacement of the upper mold base, thereby causing the upper mold base to drive the shaping punch to move vertically. Users can replace the shaping die with different sizes, so that the shaping die and the shaping punch of different sizes can be used to bend the plate at different angles to adapt to the working conditions and improve the applicability of the device.

[0010] Optionally, the shaping punch includes a shaping plate and two shaping rods, which are located on both sides of the shaping plate along its length. The lower ends of the shaping rods protrude from the lower end of the shaping plate. The side of the shaping rod away from the shaping plate is provided as a cutting edge. The shaping die includes two shaping blocks and a shaping base. The shaping base has inclined surfaces on both sides along its length. Inclined surfaces one slope from both sides of the shaping base toward the middle of the shaping block. The lower end of the shaping base has a contact surface connected to inclined surface one. A groove for accommodating the sheet material is opened below the shaping plate, and the groove is adapted to the upper end of the shaping base. The two shaping blocks are located on both sides of the shaping base along its length and are rotatably connected to the lower die base in a vertical direction. An inclined surface two is provided on the side of the shaping block near the shaping base. The shaping block has an abutment surface corresponding to the contact surface. When the contact surface contacts the abutment surface, it pushes the shaping block to rotate, causing inclined surface two to move closer to inclined surface one. At the same time, the cutting edge cooperates with the positioning block to cut the sheet material.

[0011] By adopting the above technical solution, the shaping plate supports and fixes the shaping rod, the groove accommodates and fixes the sheet material, and when the shaping plate and the shaping base are close, the shaping rod cuts the sheet material by cooperating with the positioning block through the blade. The shaping plate performs a preliminary bending of the sheet material by cooperating with the shaping base through the groove. When the contact surface and the abutment surface come into contact, the positioning block is pushed to rotate, so that the second inclined plane moves closer to the first inclined plane. The second inclined plane and the first inclined plane cooperate to perform a secondary bending process on the sheet material, which helps to improve the bending effect of the device on the sheet material.

[0012] Optionally, the lower mold base is provided with an elastic element that faces the shaping block. In its natural state, the elastic element pushes the shaping block to rotate away from the lower mold base.

[0013] By adopting the above technical solution, the elastic element pushes the positioning block to rotate in the direction of the upward mold base, making it easier for the initially bent plate to contact the inclined surface two, so as to perform a secondary bending.

[0014] Optionally, the punching mechanism includes a positioning plate and several punching blocks. The positioning plate is fixed to the lower end of the upper die base, and the punching blocks are located at the lower end of the positioning plate. The positioning plate moves closer to or away from the positioning blocks as the upper die base moves. The positioning blocks have fixing holes that are adapted to the punching blocks. The punching blocks move closer to the positioning blocks as the upper die base moves and pass through the fixing holes and the plate in sequence.

[0015] By adopting the above technical solution, when the upper mold base moves, the positioning plate drives the punching block to approach or move away from the plate. The positioning block supports and limits the plate and guides and limits the punching block through the fixing hole, so that the punching block passes through the fixing hole to punch the plate.

[0016] Optionally, the lower mold base is provided with a connecting plate, a fixing plate and a push plate. The connecting plate is connected to one side of the shaping base along the width direction. A cylinder is installed on the connecting plate. The output end of the cylinder is fixedly connected to the fixing plate. A push plate is provided between the shaping base and the shaping plate. The push plate is sleeved on the outside of the shaping base and is slidably connected to the upper end of the shaping base. The side of the fixing plate away from the cylinder is connected to the push plate.

[0017] By adopting the above technical solution, under the support of the connecting plate, the cylinder pushes the fixed plate to slide along the connecting plate through the output end. When the shaping plate moves away from the shaping base, the fixed plate drives the push plate to slide along the upper end of the shaping base, thereby pushing out the processed sheet material.

[0018] Optionally, the cross-section of the blade portion gradually decreases from both sides of the shaping plate along its length towards the middle of the shaping plate.

[0019] By adopting the above technical solution, when the shaping plate approaches the shaping base, it drives the blade to approach the plate, so that the lower end face of the blade contacts the plate first and cuts the plate, which helps to improve the bending effect of the device.

[0020] Optionally, an upper mold pad is provided between the upper mold base and the shaping die, and the shaping die is fixedly connected to the upper mold pad. A lower mold pad is provided between the lower mold base and the shaping punch, and the shaping punch is fixedly connected to the lower mold pad.

[0021] By adopting the above technical solution, the upper mold base supports and fixes the shaping plate through the upper mold pad, and the lower mold base supports and fixes the shaping base through the lower mold pad, which helps to improve the stability of the device operation.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Under the support of the mold base, the feeding mechanism transports the sheet metal from the punching mechanism to between the shaping die and the shaping punch. The punching mechanism punches through holes in the sheet metal. When the sheet metal is transported to the designated position, the positioning rod passes through the positioning block and is inserted into the positioning hole. The positioning rod and the positioning block cooperate to fix and limit the sheet metal. At this time, the shaping die and the shaping punch cooperate to bend the sheet metal, which helps to improve the stability of the device when bending the sheet metal. 2. Under the support of the lower mold base, the vertical rod guides and limits the vertical displacement of the upper mold base, thereby causing the upper mold base to drive the shaping punch to move vertically. Users can replace the shaping die with different sizes, so that the shaping die can be used with the shaping punch of different sizes to bend the plate at different angles to adapt to the working conditions and improve the applicability of the device. 3. The shaping plate supports and fixes the shaping rod, and the groove accommodates and fixes the sheet material. When the shaping plate and the shaping base are close, the shaping rod cuts the sheet material by cooperating with the positioning block through the blade. The shaping plate performs a preliminary bending of the sheet material by cooperating with the shaping base through the groove. When the contact surface and the abutment surface come into contact, the positioning block is pushed to rotate, so that the second inclined plane moves closer to the first inclined plane. The second inclined plane and the first inclined plane cooperate to perform a secondary bending process on the sheet material, which helps to improve the bending effect of the device on the sheet material. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a bending die for products with negative angles.

[0024] Figure 2 This is a schematic diagram designed to highlight the location of the guide groove.

[0025] Figure 3 This is a diagram designed to highlight the position of the blade.

[0026] Figure 4 This is a schematic diagram designed to highlight the structure of the shaping die and the shaping punch.

[0027] Figure 5 This is a cross-sectional schematic diagram of a bending die for products with negative angles.

[0028] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle.

[0029] Figure 7 This is a schematic diagram designed to highlight the location of the cylinder.

[0030] Explanation of reference numerals in the attached drawings: 1. Mold base; 11. Upper mold base; 111. Upper mold pad; 12. Lower mold base; 121. Lower mold pad; 13. Vertical rod; 2. Shaping punch; 21. Shaping plate; 22. Shaping rod; 23. Groove; 221. Blade; 3. Shaping die; 31. Shaping base; 311. Inclined surface one; 312. Contact surface; 32. Shaping block; 321. Inclined surface two; 322. Abutment surface; 4. Elastic element; 5. Positioning plate; 51. Punching block; 6. Positioning block; 61. Positioning rod; 62. Fixing hole; 63. Positioning hole; 64. Guide groove; 7. Connecting plate; 71. Cylinder; 72. Fixing plate; 73. Push plate; 8. Support plate; 81. Roller; 9. Through hole. Detailed Implementation

[0031] The present application will be further described in detail below with reference to all the accompanying drawings.

[0032] This application discloses a negative angle product bending die. Example

[0033] Reference Figure 1 A negative angle product bending die includes a die base 1, which includes an upper die base 11 and a lower die base 12. The upper die base 11 and the lower die base 12 are parallel to each other, and a vertical rod 13 is provided between the upper die base 11 and the lower die base 12. The vertical rod 13 passes through the upper die base 11 and is fixedly connected to the lower die base 12. The upper die base 11 is connected to an external stamping device (not shown in the figure), such as a hydraulic cylinder. When the stamping device is working, it drives the upper die base 11 to move back and forth vertically. Under the drive of the stamping device, the upper die base 11 moves closer to or away from the lower die base 12 along the vertical rod 13. The vertical rod 13 limits and guides the upper die base 11.

[0034] Reference Figure 1 The upper mold base 11 is provided with a feeding structure on the side where the sheet material is fed. The feeding mechanism includes a support plate 8 and multiple rollers 81. The rollers 81 are rotatably connected to the side of the support plate 8 near the upper mold base 11. A motor is installed on the side of the support plate 8 away from the rollers 81. The rollers 81 are fixedly connected to the output end of the motor. The sheet material is located between the rollers 81 and in contact with the rollers 81. The multiple rollers 81 rotate in coordination to transport the sheet material between the upper mold base 11 and the lower mold base 12.

[0035] Reference Figure 2 and Figure 3 Lower mold base 12 (reference) Figure 1The upper end is provided with a positioning block 6, and the positioning block 6 has a guide groove 64 for accommodating the plate in the transverse direction. The upper mold base 11 (reference) Figure 1 ) and lower mold base 12 (reference) Figure 1 A punching mechanism is provided between the upper die base 11 and the lower end of the upper die base 11. The punching mechanism includes a positioning plate 5 and multiple punching blocks 51. The positioning plate 5 is fixedly installed on the lower end of the upper die base 11, and the punching blocks 51 are fixedly installed on the positioning plate 5 away from the upper die base 11 (see reference). Figure 1 On one side of the plate, the positioning block 6 has a fixing hole 62 that matches the punching fastener, and the fixing hole 62 is directly opposite the plate. Upper die holder 11 (reference) Figure 1 When it moves downward, it drives the positioning plate 5 to move downward. The positioning plate 5 drives the stamping block to move closer to the positioning block 6 and the plate, so that the stamping block passes through the fixing hole 62 to stamp the plate and form a through hole 9.

[0036] Reference Figure 4 and Figure 5 An upper mold base 11 has an upper mold pad 111 fixedly installed at its lower end. A positioning rod 61 is fixedly installed on the side of the upper mold pad 111 near the positioning plate 5. A positioning hole 63 adapted to the positioning rod 61 is opened on the positioning block 6. The positioning hole 63 is directly opposite the plate. When the upper mold base 11 moves downward, it drives the upper mold pad 111 to move downward. The upper mold pad 111 drives the positioning rod 61 to move downward, so that the positioning rod 61 is inserted into the positioning hole 63 and the through hole 9 in sequence, and is aligned with the positioning hole 63 and the through hole 9 (see reference). Figure 3 The inner wall is fitted together, and the positioning rod 61 cooperates with the positioning block 6 to achieve the positioning of the plate.

[0037] Reference Figure 3 and Figure 4 Upper mold pad 111 (reference) Figure 1 A shaping punch 2 is fixedly installed on the side opposite to the upper mold base 11. The shaping punch 2 includes a shaping plate 21 and a shaping rod 22. The shaping plate 21 has vertical mounting grooves on both sides along its length. The shaping rod 22 is located in the mounting groove and fits against the inner wall of the mounting groove. The shaping plate 21 supports and fixes the shaping rod 22 through the mounting grooves. The side of the shaping rod 22 closest to the positioning plate 5 is provided as a cutting edge 221. The cutting edge 221 protrudes from the lower end of the shaping plate 21, and the cross-section of the cutting edge 221 gradually decreases from both sides of the shaping plate 21 towards the middle of the shaping plate 21.

[0038] refer to Figure 1 and Figure 5A lower mold base 12 has a lower mold pad 121 installed on its upper end, and a shaping die 3 is installed on the upper end of the lower mold pad 121. The lower mold base 12 supports the shaping die 3 through the lower mold pad 121, which helps to improve the stability of the device. The shaping die 3 includes a shaping base 31 and two shaping blocks 32. The shaping blocks 32 are distributed on both sides of the shaping base 31 along its length. Each shaping block 32 is rotatably connected to a vertical plate, which is fixedly connected to the lower mold base 12. The lower mold pad 121 supports the shaping blocks 32 through the vertical plates. The lower mold pad 121 has an elastic element 4 inside that faces the vertical plate. The elastic element 4 can be a spring. In its initial state, the spring pushes the shaping block 32 to rotate away from the lower mold base 12.

[0039] refer to Figure 3 and Figure 4 The shaping base 31 has inclined surfaces 311 on both sides along its length, which slope towards the middle. The lower end of the shaping base 31 has a contact surface 312 connected to the inclined surfaces 311. The shaping block 32, near the shaping base 31, has an inclined surface 321 corresponding to the inclined surfaces 311 and an abutment surface 322 corresponding to the contact surface 312. The shaping plate 21 has grooves 23 along its length for accommodating the plate material, which guide and limit the plate material.

[0040] refer to Figure 3 and Figure 4 Upper mold base 11 (reference) Figure 1 When the mold moves closer to the lower mold base 12, it drives the shaping plate 21 to move closer to the shaping base 31. The blade 221 cooperates with the positioning block 6 to cut the plate. The upper end of the shaping base cooperates with the shaping block 32 to perform initial bending of the plate, so that the angle between the second inclined surface 321 and the abutment surface 322 is directly opposite to the plate. When the contact surface 312 contacts the abutment surface 322, it pushes the shaping block 32 to rotate closer to the shaping base, so that the second inclined surface 321 moves closer to the first inclined surface 311 and fits, realizing the secondary bending of the plate, which is beneficial to improving the bending effect of the plate.

[0041] Reference Figure 4 Bolts are installed between the shaping base 31 and the lower mold base 12. The shaping base 31 is detachably connected to the lower mold base 12 by bolts, which allows users to bend the sheet metal at different angles by replacing the shaping base 31, thus improving the applicability of the device.

[0042] Reference Figure 7The upper end of the lower mold pad 121 is provided with a connecting plate 7 parallel to the lower mold pad 121. A cylinder 71 is installed on the connecting plate 7. A fixing plate 72 is fixedly connected to the output end of the cylinder 71. A push plate 73 is fixedly connected to the side of the fixing plate 72 away from the cylinder 71. The push plate 73 is located between the shaping plate 21 and the shaping base 31 and is slidably connected to the upper end of the shaping base 31. After the sheet material is processed, the cylinder 71 drives the fixing plate 72 to move closer to the shaping base 31. The fixing plate 72 drives the push plate 73 to slide along the shaping base 31, pushing the processed sheet material out of the shaping base 31 for easy collection by the user and improving the ease of operation of the device.

[0043] The implementation principle of the negative angle product bending die in this application embodiment is as follows: Under the drive of external stamping equipment, the upper die base 11 moves closer to the lower die base 12 along the height direction of the vertical rod 13. The upper die base 11 drives the positioning plate 5 to move closer to the positioning block 6. The positioning plate 5 drives the stamping block to stamp through holes 9 in the sheet metal. At the same time, the upper die base 11 drives the positioning rod 61 to be inserted into the positioning hole 63 and the through hole 9, thereby fixing the sheet metal. The upper die base 11 drives the shaping plate 21 to move closer to the shaping base 31 through the upper die pad 111. The cutting edge 221 contacts the positioning block 6 and cooperates with the positioning block 6 to cut the sheet metal. The shaping plate 21 and the shaping base 31 cooperate with the sheet metal to bend. At this time, the positioning block 6 and the positioning rod 61 cooperate to limit and fix the sheet metal, reduce the probability of the sheet metal shaking, and enable the device to perform precise bending of the sheet metal, which is beneficial to improving the stability of the device during operation.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A negative angle product bending die, comprising a die base (1), wherein the die base (1) is provided with a shaping die (3) and a shaping punch (2) that open and close vertically, characterized in that: Also includes: The punching mechanism is located at the beginning of the mold base (1). When the plate passes through the punching mechanism, the punching mechanism punches through holes (9) in the plate. The feeding mechanism is used to feed the sheet metal to the shaping die (3) and the shaping punch (2). When the feeding mechanism is working, it drives the sheet metal to be fed between the shaping die (3) and the shaping punch (2) from the punching mechanism. The positioning block (6) is located at the lower end of the mold base (1). The upper end of the positioning block (6) is provided with a positioning hole (63) corresponding to the through hole of the plate. The mold base (1) is also provided with a positioning rod (61) corresponding to the positioning hole (63). During the closing process of the shaping die (3) and the shaping punch (2), the positioning rod (61) passes through the through hole (9) on the plate and is located in the positioning hole (63). The positioning rod (61) abuts against the inner wall of the through hole (9) of the plate. At this time, the part of the plate that needs to be bent is between the shaping die (3) and the shaping punch (2).

2. The negative angle product bending die according to claim 1, characterized in that: The mold base (1) includes an upper mold base (11) and a lower mold base (12). A plurality of vertical rods (13) are provided between the upper mold base (11) and the lower mold base (12). The vertical rods (13) pass through the upper mold base (11) vertically and are fixedly connected to the lower mold base (12). The upper mold base (11) moves closer to or further away from the lower mold base (12) along the height direction of the vertical rods (13). The shaping punch (2) is located at the lower end of the upper mold base (11). The shaping die (3) is detachably connected to the upper end of the lower mold base (12). The shaping punch (2) moves closer to or further away from the shaping die (3) along with the upper mold base (11).

3. The negative angle product bending die according to claim 1, characterized in that: The shaping punch (2) includes a shaping plate (21) and two shaping rods (22). The two shaping rods (22) are located on both sides of the shaping plate (21) along its length. The lower end of the shaping rod (22) protrudes from the lower end of the shaping plate (21). The side of the shaping rod (22) away from the shaping plate (21) is provided as a cutting edge (221). The shaping die (3) includes two shaping blocks (32) and a shaping base (31). The shaping base (31) has inclined surfaces (311) on both sides along its length. The inclined surfaces (311) slope from both sides of the shaping base (31) toward the middle of the shaping blocks (32). The lower end of the shaping base (31) has a contact surface (312) that connects with the inclined surfaces (311). The template (21) has a groove (23) for accommodating the plate, and the groove (23) is adapted to the upper end of the shaping base (31). Two shaping blocks (32) are located on both sides of the shaping base (31) along the length direction and are vertically connected to the lower mold base (12). The shaping block (32) has a second inclined surface (321) on the side close to the shaping base (31). The shaping block (32) has an abutting surface (322) corresponding to the contact surface (312). When the contact surface (312) contacts the abutting surface (322), the shaping block (32) is pushed to rotate, so that the second inclined surface (321) moves closer to the first inclined surface (311). At the same time, the blade (221) cooperates with the positioning block (6) to cut the plate.

4. The negative angle product bending die according to claim 3, characterized in that: The lower mold base (12) is provided with an elastic element (4) that is directly opposite to the shaping block (32). In its natural state, the elastic element (4) pushes the shaping block (32) to rotate away from the lower mold base (12).

5. The negative angle product bending die according to claim 2, characterized in that: The punching mechanism includes a positioning plate (5) and several punching blocks (51). The positioning plate (5) is fixed at the lower end of the upper mold base (11), and the punching blocks (51) are located at the lower end of the positioning plate (5). The positioning plate (5) moves closer to or further away from the positioning block (6) along with the upper mold base (11). The positioning block (6) has a fixing hole (62) that matches the punching block (51). The punching block (51) moves closer to the positioning block (6) along with the upper mold base (11) and passes through the fixing hole (62) and the plate in sequence.

6. The negative angle product bending die according to claim 2, characterized in that: The lower mold base (12) is provided with a connecting plate (7), a fixing plate (72) and a push plate (73). The connecting plate (7) is connected to one side of the shaping base (31) along the width direction. A cylinder (71) is installed on the connecting plate (7). The output end of the cylinder (71) is fixedly connected to the fixing plate (72). A push plate (73) is provided between the shaping base (31) and the shaping plate (21). The push plate (73) is sleeved on the outside of the shaping base (31) and slidably connected to the upper end of the shaping base (31). The side of the fixing plate (72) away from the cylinder (71) is connected to the push plate (73).

7. The negative angle product bending die according to claim 3, characterized in that: The cross-section of the blade (221) gradually decreases from both sides of the shaping plate (21) along the length direction towards the middle part of the shaping plate (21).

8. The negative angle product bending die according to claim 2, characterized in that: An upper mold pad (111) is provided between the upper mold base (11) and the shaping die (3), and the shaping die (3) is fixedly connected to the upper mold pad (111). A lower mold pad (121) is provided between the lower mold base (12) and the shaping punch (2), and the shaping punch (2) is fixedly connected to the lower mold pad (121).

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