Automobile rear quarter inner panel c-shaped piercing die

Abstract

The application relates to the technical field of rear quarter inner plates, and discloses a C-shaped puncture die for an automobile rear quarter inner plate, which comprises a female die, a male die, a clamping mechanism and an adjusting mechanism. Through the double fixing mode of magnetic blocks and screws between the bosses and the mounting pieces, the magnetic blocks are first adsorbed by magnetic force to realize rapid preliminary positioning, facilitate accurate butt joint of the mounting pieces and the bosses, reduce installation and debugging time, then the screws are fastened through the threaded holes to further enhance the connection strength, so that the C-shaped puncture knife cannot be loosened and shifted due to vibration and impact force in high-speed stamping and frequent puncture operations, the working stability and reliability of the mechanism are effectively improved, when the C-shaped puncture knife is worn or needs to be replaced by a knife of different specifications to adapt to new production requirements, only the screws need to be disassembled, the mounting piece and the puncture knife are removed, and replacement can be quickly completed, the whole male die or puncture mechanism does not need to be complicatedly disassembled, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of rear side panel technology, specifically a C-shaped puncture mold for automotive rear side panel. Background Technology

[0002] In the automobile manufacturing process, the stamping quality of the rear side panel has a significant impact on the safety and appearance of the entire vehicle.

[0003] However, traditional piercing mechanisms, such as circular piercing knives, suffer from uneven material flow due to the uneven distance between the cutting edge and the edge of the rectangular drawing boss when used for high-drop rectangular deep drawing. This results in excessive thinning at the rounded corners of the product and even breakage. If a non-standard C-shaped piercing mechanism could be added to the scrap area without affecting the parts, it could pierce the material during the forming process to release stress and reduce the overall fracture coefficient, thus ensuring the quality of the formed parts. At the same time, existing equipment does not have the function of disassembling the piercing knife, which greatly increases the difficulty of equipment maintenance. When the C-shaped piercing mechanism is worn, damaged, or the cutting edge is dulled, it is difficult for maintenance personnel to accurately repair or replace it because it cannot be disassembled. It also limits the equipment's adaptability to different production needs. In the process of automobile manufacturing, vehicle models are frequently updated, and the shape, size, and process requirements of the rear side panel inner panel of different models vary greatly, which greatly increases the limitations of the device. In order to solve the above problems, a C-shaped piercing mold for automobile rear side panel inner panel is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a C-shaped puncture mold for the inner rear panel of an automobile, which has advantages such as reducing the risk of breakage and facilitating disassembly, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a C-shaped piercing mold for the inner rear panel of an automobile, comprising a concave mold, a convex mold, a clamping mechanism, and an adjusting mechanism. The convex mold overlaps with the side of the concave mold, a boss is fixedly connected to the side of the convex mold, and a mounting component overlaps with the side of the boss. Several magnetic blocks are disposed inside the boss and the mounting component, and several threaded holes are opened inside the boss and the mounting component. Screws are threaded into the threaded holes. A C-shaped piercing knife is fixedly installed on the side of the mounting component, and a groove is opened on the side of the concave mold.

[0006] The above solution employs a dual fixing method of magnetic blocks and screws between the boss and the mounting component. The magnetic blocks first use magnetic force for rapid initial positioning, facilitating precise alignment between the mounting component and the boss and reducing installation and debugging time. Subsequently, the screws are tightened through threaded holes to further enhance the connection strength, ensuring that the C-type piercing blade will not loosen or shift due to vibration or impact during high-speed stamping and frequent piercing operations. This effectively improves the stability and reliability of the mechanism. When the C-type piercing blade wears out or needs to be replaced with a different specification blade to adapt to new production requirements, only the screws need to be removed. The installation parts and piercing blade can be removed for quick replacement without the need for complex disassembly of the entire punch or piercing mechanism, reducing maintenance costs and improving equipment maintainability and production efficiency. At the same time, the unique shape design of the C-type piercing blade, compared with traditional piercing blades, can better conform to the contour of the part when dealing with parts such as high drop and complex-shaped rear side panels. The blade edge makes more uniform contact with the material, effectively guiding the material flow, reducing stress concentration, and reducing problems such as material cracking and wrinkling. It is especially suitable for piercing and forming of difficult-to-machine materials such as high-strength steel, improving the product forming quality.

[0007] Furthermore, the clamping mechanism includes four electric push rods fixedly installed on the side of the die, and one end of each of the two sets of electric push rods is fixedly connected to a clamping plate, and the surface of each of the two clamping plates is provided with a rubber pad.

[0008] The above solution, by setting up a clamping mechanism, enables the electric push rod to drive the clamping plate to clamp the material. The rubber pad increases friction and avoids damaging the material surface, ensuring that the material is fixed in position during the puncture process and preventing puncture deviation due to material slippage, thus providing a guarantee for high-quality puncture operations.

[0009] Furthermore, the adjustment mechanism includes four slide rods fixedly connected to the side of the die, the punch slidably connected to the surface of the slide rods, a support frame fixedly connected to the surface of the two sets of slide rods, a hydraulic cylinder fixedly installed on the side of the support frame, a hydraulic rod fixedly installed inside the hydraulic cylinder, and one end of the hydraulic rod fixedly connected to the side of the punch.

[0010] The above solution, through the setting of an adjustment mechanism, enables the hydraulic cylinder and hydraulic rod to cooperate with the slide rod, thereby realizing the left and right movement of the punch. By controlling the hydraulic cylinder to drive the hydraulic rod, the punch stroke and piercing force can be precisely adjusted to adapt to the piercing requirements of materials with different thicknesses and hardnesses. There is no need to change the equipment hardware; the operation mode can be switched simply by adjusting the parameters, which significantly enhances the versatility and flexibility of the mechanism.

[0011] Furthermore, both sides of the die are fixedly connected to support plates, and bolts are threaded into the interior of both support plates.

[0012] With the above scheme, the support plate is installed on both sides of the die by a fixed connection, providing a solid support foundation for the entire piercing mechanism. The threaded bolts further connect the support plate to the working platform or other fixed parts. This rigid connection method can effectively disperse the impact force and vibration generated during the piercing operation.

[0013] Furthermore, the side of the die has two cavities, and L-shaped plates are overlapped inside the two cavities. Waste boxes are fixedly connected to the bottom of the two L-shaped plates, and through holes are opened on the top of the two L-shaped plates.

[0014] With the above solution, the cavity opened on the side of the die, together with the L-shaped plate and the waste box, forms an integrated waste collection system. During the puncture operation, the waste generated can fall directly into the waste box without the need for an additional waste conveying device, effectively preventing waste from scattering everywhere and maintaining the cleanliness of the work area.

[0015] Furthermore, two baffles are fixedly installed on the side of the die by studs.

[0016] The above solution, with its baffle, facilitates subsequent maintenance of the components within the cavity.

[0017] Furthermore, springs are fixedly connected to the top of the inner cavity of each of the two cavities, horizontal plates are fixedly connected to the surface of each of the two springs, and limit posts are fixedly connected to the bottom of each of the two horizontal plates. The limit posts are inserted into the through holes, and fixing blocks are fixedly connected to the sides of each of the two horizontal plates.

[0018] Through the above scheme, the cooperation between the spring and the limiting post realizes the automatic limiting function of the waste residue box. When the L-shaped plate drives the waste residue box into the cavity, the limiting post automatically inserts into the through hole at the top of the L-shaped plate under the action of the spring force, forming a mechanical lock and firmly fixing the waste residue box in the working position. This limiting structure can ensure that the waste residue box will not shift or fall off, effectively prevent waste from spilling, ensure the stability and reliability of the waste collection process, and avoid affecting the production order and equipment safety due to the loosening of the waste residue box.

[0019] Furthermore, a silicone pad is provided at the bottom of both support plates.

[0020] Through the above solution, the silicone pad has good elasticity and flexibility, and can effectively absorb the vibration generated when the puncture mechanism is working.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects: This C-shaped piercing die for the inner rear panel of an automobile utilizes a dual fixing method of magnetic blocks and screws between the boss and the mounting part. The magnetic blocks first use magnetic force to achieve rapid initial positioning, facilitating precise alignment between the mounting part and the boss and reducing installation and debugging time. Subsequently, the threaded holes and screws further enhance the connection strength, ensuring that the C-shaped piercing blade will not loosen or shift due to vibration or impact during high-speed stamping and frequent piercing operations. This effectively improves the stability and reliability of the mechanism. When the C-shaped piercing blade wears out or needs to be replaced with a different specification blade to adapt to new production requirements, only... Simply remove the screws and take off the mounting parts and piercing blade for quick replacement. This eliminates the need for complex disassembly of the entire punch or piercing mechanism, reducing maintenance costs and improving equipment maintainability and production efficiency. Furthermore, the unique shape design of the C-type piercing blade, compared to traditional piercing blades, allows for a closer fit to the contours of parts with high drops and complex shapes, such as rear side panels. This results in more uniform contact between the blade and the material, effectively guiding material flow, reducing stress concentration, and minimizing problems like material cracking and wrinkling. It is particularly suitable for piercing and forming difficult-to-machine materials such as high-strength steel, improving product forming quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 This is an exploded view of the die and punch in this application. Figure 3 This is a side exploded view of the die and punch in this application; Figure 4 This is an exploded side view of the boss and mounting component in this application. Figure 5 This is a side view of the adjustment mechanism in this application; Figure 6 This is an exploded view of the die and waste box in this application.

[0023] In the picture: 1. Die; 2. Punch; 3. Clamping mechanism; 301. Electric push rod; 302. Clamping plate; 303. Rubber pad; 4. Adjustment mechanism; 401. Slide rod; 402. Support frame; 403. Hydraulic cylinder; 404. Hydraulic rod; 5. Support plate; 6. Bolt; 7. L-shaped plate; 8. Waste box; 9. Baffle; 10. Boss; 11. Mounting part; 12. Groove; 13. Magnetic block; 14. Threaded hole; 15. Screw; 16. C-shaped piercing knife; 17. Through hole; 18. Cavity; 19. Spring; 20. Horizontal plate; 21. Limiting post; 22. Fixing block; 23. Silicone pad. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment of a C-shaped piercing mold for a car rear side panel includes a concave mold 1, a convex mold 2, a clamping mechanism 3, and an adjusting mechanism 4. The convex mold 2 overlaps with the side of the concave mold 1. A boss 10 is fixedly connected to the side of the convex mold 2. A mounting part 11 overlaps with the side of the boss 10. Several magnetic blocks 13 are disposed inside the boss 10 and the mounting part 11. Several threaded holes 14 are opened inside the boss 10 and the mounting part 11. Screws 15 are threaded into the threaded holes 14. A C-shaped piercing knife 16 is fixedly installed on the side of the mounting part 11. A groove 12 is opened on the side of the concave mold 1. The boss 10 and the mounting part 11 are fixedly connected by a dual fixing method using magnetic blocks 13 and screws 15. The magnetic blocks 13 first use magnetic attraction to achieve rapid initial positioning, facilitating precise docking of the mounting part 11 and the boss 10, reducing installation and debugging time. Then, they are tightened through the threaded holes 14 and screws 15, further... The C-type piercing knife 16 is designed to enhance connection strength, ensuring that it will not loosen or shift due to vibration or impact during high-speed stamping and frequent piercing operations. This effectively improves the stability and reliability of the mechanism. When the C-type piercing knife 16 wears out or needs to be replaced with a different specification of knife to meet new production requirements, the replacement can be completed quickly by simply removing the screw 15, taking off the mounting part 11 and the piercing knife. There is no need to disassemble the entire punch 2 or piercing mechanism in a complicated manner, reducing maintenance costs and improving equipment maintainability and production efficiency. At the same time, the unique shape design of the C-type piercing knife 16, compared with traditional piercing knives, can better fit the contour of the part when dealing with parts such as high-drop and complex-shaped rear side inner plates. The contact between the cutting edge and the material is more uniform, effectively guiding the material flow, reducing stress concentration, and reducing problems such as material cracking and wrinkling. It is especially suitable for piercing and forming of difficult-to-machine materials such as high-strength steel, improving the product forming quality.

[0026] Please see Figure 2 and Figure 5The clamping mechanism 3 includes four electric push rods 301 fixedly installed on the side of the die 1. One end of each set of electric push rods 301 is fixedly connected to a clamping plate 302. Rubber pads 303 are provided on the surfaces of both clamping plates 302. By setting the clamping mechanism 3, the electric push rods 301 can drive the clamping plates 302 to clamp the material. The rubber pads 303 increase friction and prevent damage to the material surface, ensuring the material remains in a fixed position during puncture and preventing puncture deviation due to material slippage. This provides a guarantee for high-quality puncture operations. The adjusting mechanism 4 includes four sliding rods 401 fixedly connected to the side of the die 1. The punch 2 is slidably connected to the surface of the sliding rods 401. Two sets of sliding rods... A support frame 402 is fixedly connected to the surface of 401. A hydraulic cylinder 403 is fixedly installed on the side of the support frame 402. A hydraulic rod 404 is fixedly installed inside the hydraulic cylinder 403. One end of the hydraulic rod 404 is fixedly connected to the side of the punch 2. By setting an adjustment mechanism 4, the hydraulic cylinder 403 and the hydraulic rod 404 can cooperate with the slide rod 401 to realize the left and right movement of the punch 2. By controlling the hydraulic cylinder 403 to drive the hydraulic rod 404, the stroke and piercing force of the punch 2 can be precisely adjusted to adapt to the piercing requirements of materials with different thicknesses and hardnesses. There is no need to change the equipment hardware. The operation mode can be switched by simply adjusting the parameters, which significantly enhances the versatility and flexibility of the mechanism.

[0027] Please see Figure 1 Both sides of the die 1 are fixedly connected to support plates 5, and bolts 6 are threaded inside the two support plates 5. The support plates 5 are installed on both sides of the die 1 by a fixed connection, providing a solid support foundation for the entire piercing mechanism. The threaded bolts 6 further connect the support plates 5 to the working platform or other fixed parts. This rigid connection method can effectively disperse the impact force and vibration generated during the piercing operation. Two cavities 18 are opened on the side of the die 1. L-shaped plates 7 are overlapped inside the two cavities 18. Waste boxes 8 are fixedly connected to the bottom of the two L-shaped plates 7. Through holes 17 are opened on the top of the two L-shaped plates 7. The cavities 18 opened on the side of the die 1, the L-shaped plates 7, and the waste boxes 8 form an integrated waste collection system. During the piercing operation, the waste generated can fall directly into the waste box 8 without the need for an additional waste conveying device, effectively preventing waste from scattering everywhere and maintaining the cleanliness of the working area.

[0028] Please see Figure 1 and Figure 6Two baffles 9 are fixedly installed on the side of the die 1 by studs. The baffles 9 facilitate subsequent maintenance of the components inside the cavity 18. Springs 19 are fixedly connected to the top of the two cavities 18. Horizontal plates 20 are fixedly connected to the surface of the two springs 19. Limiting posts 21 are fixedly connected to the bottom of the two horizontal plates 20. The limiting posts 21 are inserted into the through hole 17. Fixing blocks 22 are fixedly connected to the sides of the two horizontal plates 20. The cooperation between the springs 19 and the limiting posts 21 realizes the automatic limiting function of the waste box 8. When L When the mold plate drives the waste slag box 8 into the cavity 18, the limiting post 21 automatically inserts into the through hole 17 at the top of the L-shaped plate 7 under the elastic force of the spring 19, forming a mechanical lock and firmly fixing the waste slag box 8 in the working position. This limiting structure can ensure that the waste slag box 8 will not shift or fall off, effectively preventing waste from spilling, ensuring the waste collection process is stable and reliable, and avoiding the impact on production order and equipment safety due to the loosening of the waste slag box 8. The bottom of both support plates 5 is equipped with silicone pads 23. The silicone pads 23 have good elasticity and flexibility and can effectively absorb the vibration generated when the puncture mechanism is working.

[0029] This embodiment of a C-shaped piercing mold for a car rear side panel utilizes a dual fixing method between the boss 10 and the mounting part 11: a magnetic block 13 and a screw 15. The magnetic block 13 first uses magnetic attraction for rapid initial positioning, facilitating precise alignment between the mounting part 11 and the boss 10 and reducing installation and debugging time. Subsequently, it is tightened with the screw 15 through the threaded hole 14, further enhancing the connection strength. This ensures that the C-shaped piercing blade 16 will not loosen or shift due to vibration or impact during high-speed stamping and frequent piercing operations, effectively improving the stability and reliability of the mechanism. When the C-shaped piercing blade 16 wears out or needs to be replaced with a different specification blade, it can be easily replaced. When new production needs arise, replacement can be quickly completed simply by removing screw 15, mounting part 11, and piercing knife. This eliminates the need for complex disassembly of the entire punch 2 or piercing mechanism, reducing maintenance costs and improving equipment maintainability and production efficiency. Meanwhile, the unique shape design of the C-type piercing knife 16, compared to traditional piercing knives, allows it to better conform to the contour of parts such as high-drop, complex-shaped rear side inner plates. The blade edge makes more uniform contact with the material, effectively guiding material flow, reducing stress concentration, and minimizing problems such as material cracking and wrinkling. It is especially suitable for piercing and forming of difficult-to-machine materials such as high-strength steel, improving product forming quality.

[0030] The working principle of the above embodiment is as follows: First, the support plate 5 is fixed to the working platform by bolts 6, providing a stable support foundation for the entire puncture mechanism. The silicone pad 23 at the bottom of the support plate 5 uses its own elasticity and flexibility to absorb the vibration during the operation of the equipment and reduce the transmission of vibration to the platform. Then, the material to be processed, the inner rear panel, is placed on the working surface of the die 1. The control system starts the clamping mechanism 3, and the four electric push rods 301 extend synchronously, driving the connected clamping plate 302 to move towards the material. The clamping plate 302 with rubber pads 303 on its surface is in close contact with the material surface. The rubber pads 303 increase the friction and provide a stable clamping force without damaging the material surface, ensuring that the material remains in a fixed position during the subsequent puncture process and avoiding deviation of the puncture position due to material slippage. Then, based on the material's thickness, hardness, and other characteristics, the operator sets the parameters of the adjustment mechanism 4 through the control system. The hydraulic cylinder 403 starts working, and the hydraulic oil pushes the hydraulic rod 404 to extend and retract, causing the punch 2 connected to the hydraulic rod 404 to slide up and down on the surface of the slide rod 401. The slide rod 401 provides guidance for the movement of the punch 2, ensuring its movement trajectory is accurate. By controlling the extension and retraction length and thrust of the hydraulic rod 404, the stroke and piercing force of the punch 2 can be precisely adjusted, so that the C-type piercing knife 16 can adapt to the piercing requirements of different materials. After the material is fixed and the parameters are adjusted, the upper die (including the punch 2 and the C-shaped piercing knife 16) moves to the left under the drive of the press. The punch 2 and the die 1 gradually approach each other. The C-shaped piercing knife 16 moves to the left with the punch 2. Since the boss 10 and the mounting part 11 are double fixed by the magnetic block 13 and the screw 15, the C-shaped piercing knife 16 is firmly installed and will not be displaced due to movement. The unique shape of the C-shaped piercing knife 16 allows its cutting edge to closely fit the contour of the rear side inner panel with the same height difference and complex shape. During the piercing process, the cutting edge contacts the material evenly, guides the material flow, disperses stress, and reduces the risk of material breakage and wrinkling. When the punch 2 moves to the set position to the left, the C-shaped piercing knife 16 is completely inserted into the groove 12 of the die 1, completing the piercing action on the material and accurately forming the required hole or cut. During the puncture operation, the waste material generated falls directly into the waste box 8 connected to the L-shaped plate 7 below the side cavity 18 of the die 1. When the L-shaped plate 7 is inserted into the cavity 18, the spring 19 at the top of the cavity 18 pushes the horizontal plate 20 and the limiting post 21 downward. The limiting post 21 automatically inserts into the top through hole 17 of the L-shaped plate 7, forming a mechanical lock to firmly fix the waste box 8 and prevent it from shifting or falling off during the operation. After the waste box 8 is full, the operator pulls the fixing block 22 on the side of the horizontal plate 20 to overcome the elastic force of the spring 19 and lift the horizontal plate 20, so that the limiting post 21 disengages from the through hole 17. The L-shaped plate 7 and the waste box 8 can then be easily pulled out for waste cleaning. After a period of use, when the C-type piercing knife 16 wears out, or when it is necessary to replace it with a different specification knife due to the production of new products, simply unscrew the screw 15 between the boss 10 and the mounting part 11, and take advantage of the weak adsorption force of the magnetic block 13 to easily remove the mounting part 11 and the piercing knife for replacement.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A C-shaped puncture mold for the inner panel of a car rear side panel, comprising a concave mold (1), a convex mold (2), a clamping mechanism (3), and an adjusting mechanism (4), characterized in that: The side of the concave mold (1) is connected to the convex mold (2), the side of the convex mold (2) is fixedly connected to the boss (10), the side of the boss (10) is connected to the mounting part (11), the inside of the boss (10) and the mounting part (11) is provided with a number of magnetic blocks (13), the inside of the boss (10) and the mounting part (11) is provided with a number of threaded holes (14), the inside of the threaded holes (14) is connected to screws (15), the side of the mounting part (11) is fixedly installed with a C-shaped piercing knife (16), and the side of the concave mold (1) is provided with a groove (12).

2. The C-shaped puncture mold for the inner rear panel of an automobile as described in claim 1, characterized in that: The clamping mechanism (3) includes four electric push rods (301) fixedly installed on the side of the die (1). One end of each set of electric push rods (301) is fixedly connected to a clamping plate (302), and the surfaces of the two clamping plates (302) are provided with rubber pads (303).

3. The C-shaped puncture mold for the inner panel of a car rear side panel according to claim 1, characterized in that: The adjustment mechanism (4) includes four slide rods (401) fixedly connected to the side of the die (1). The punch (2) is slidably connected to the surface of the slide rods (401). Support frames (402) are fixedly connected to the surfaces of the two sets of slide rods (401). Hydraulic cylinders (403) are fixedly installed on the side of the support frames (402). Hydraulic rods (404) are fixedly installed inside the hydraulic cylinders (403). One end of the hydraulic rods (404) is fixedly connected to the side of the punch (2).

4. The C-shaped puncture mold for the inner rear panel of an automobile as described in claim 1, characterized in that: Both sides of the die (1) are fixedly connected to support plates (5), and the interiors of the two support plates (5) are threaded with bolts (6).

5. The C-shaped puncture mold for the inner rear panel of an automobile according to claim 1, characterized in that: The side of the die (1) has two cavities (18), and L-shaped plates (7) are connected inside the two cavities (18). Waste slag boxes (8) are fixedly connected to the bottom of the two L-shaped plates (7), and through holes (17) are opened on the top of the two L-shaped plates (7).

6. The C-shaped puncture mold for the inner rear panel of an automobile according to claim 1, characterized in that: Two baffles (9) are fixedly installed on the side of the die (1) by studs.

7. A C-shaped puncture mold for the inner rear panel of an automobile according to claim 5, characterized in that: Springs (19) are fixedly connected to the top of the two cavities (18), and horizontal plates (20) are fixedly connected to the surfaces of the two springs (19). Limiting posts (21) are fixedly connected to the bottom of the two horizontal plates (20). The limiting posts (21) are inserted into the through hole (17). Fixing blocks (22) are fixedly connected to the sides of the two horizontal plates (20).

8. A C-shaped puncture mold for the inner rear panel of an automobile according to claim 4, characterized in that: Both of the support plates (5) have silicone pads (23) at their bottoms.

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