A self-demolding perforating mold

Abstract

This utility model relates to the field of mold technology and discloses a self-demolding flanging mold, including an upper mold and a lower mold. The lower mold has a protruding punch head, and the upper mold has a clearance hole for the punch head to extend into. It also includes a first reset component, which is disposed on the lower mold and has a mounting position for mounting parts. When the upper mold is pressed down, the first reset component is compressed by the upper mold to deform, causing the punch head to gradually exceed the mounting position. When the upper mold is raised, the first reset component gradually springs back to its initial state and uses the spring force to push the parts away from the punch head. A second reset component is disposed in the clearance hole. When the upper mold is pressed down, the end of the punch head abuts against the second reset component and drives it to elastically compress into the clearance hole. When the upper mold is raised, as the punch head exits the clearance hole, the second reset component gradually extends outward until it pushes the parts out of the clearance hole. This mold can push the parts out of the punch head and the clearance hole at the same time, which greatly reduces the demolding difficulty of the parts after flanging.

Description

Technical Field

[0001] This utility model relates to the field of hole-flipping mold technology, and in particular to a hole-flipping mold that can be demolded independently. Background Technology

[0002] Chinese patent CN212397749U discloses a structure for a high-strength steel flanging mold. This mold structure includes an upper mold and a lower mold. The upper mold has a protruding punch head, and the lower mold has a clearance hole for the punching component to enter. The outer diameter of the punch head increases gradually from top to bottom, with each level transitioned by a slope. A gap is left between the outer wall of the punch head's punching portion and the inner wall of the clearance hole. When using this mold structure to flanging a part, an initial hole smaller than the final size requirement needs to be left on the part. The part is then placed on the lower mold, aligning the initial hole with the punch head. The upper mold is then pressed down, causing the punch head to push the material near the initial hole and fold it downwards. When the largest outer diameter part of the punch head extends into the clearance hole, the diameter of the flanged hole reaches its maximum. The folded portion fills the space between the clearance hole and the punch head, forming a flange. The upper mold is then driven to rise and detach from the lower mold, allowing the part to be removed.

[0003] As described above, when the mold structure is used to turn holes in parts, the gradually increasing outer diameter of the stamping head can process the initial hole to the final size in one go, reducing processing steps and time. However, this processing method makes demolding very difficult. Since the flange near the hole is formed by the stamping head pushing and expanding outward in the initial hole state, after processing, the flange is in an interference fit with the outer wall of the stamping head and the inner wall of the clearance hole, making it difficult to remove. The mold structure described above lacks a structure that facilitates demolding of parts. Therefore, the mold has the problem of inconvenient demolding. Utility Model Content

[0004] In view of the shortcomings of existing hole-flipping molds, which lack auxiliary demolding structures and thus cause inconvenience in demolding, the purpose of this utility model is to provide a hole-flipping mold that can be demolded automatically after processing.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0006] A self-demolding flanging die includes an upper die and a lower die. A punch head is protruding from the lower die, and a clearance hole is formed on the upper die for the punch head to extend into. The die also includes a dual demolding mechanism that pushes the part away from the punch head and out of the clearance hole when the upper and lower dies separate. The dual demolding mechanism includes:

[0007] The first reset component is disposed on the lower die and has a mounting position for mounting the part. When the upper die is pressed down, the first reset component is compressed by the upper die to deform, causing the stamping head to gradually exceed the mounting position. When the upper die is raised, the first reset component gradually springs back to the initial state and uses the spring force to push the part away from the stamping head.

[0008] The second reset component is disposed in the clearance hole. When the upper die is pressed down, the end of the punch head abuts against the second reset component and drives it to elastically compress into the clearance hole. When the upper die is raised, as the punch head exits the clearance hole, the second reset component gradually extends outward until it pushes the part out of the clearance hole.

[0009] The above-mentioned solution incorporates a dual demolding mechanism at the stamping head and the clearance hole, namely a first reset component and a second reset component. The demolding operation is performed on the part from two different directions. The first reset component uses the spring force to push the part away from the stamping head, while the second reset component pushes the flange formed in the clearance hole after the part is turned out of the clearance hole, thereby effectively solving the problem of inconvenient demolding and greatly improving demolding efficiency.

[0010] Preferably, the first reset assembly includes a pad for placing parts, which is provided for upper guide lifting of the lower mold, and a first elastic member disposed between the pad and the lower mold.

[0011] Preferably, the first elastic element includes a spring block that compresses downward to reduce its height when the upper mold is pressed down and returns to its initial state by its own springback capability when the upper mold is raised. The spring block is made of a material with good elastic deformation capability and good springback reset capability after deformation.

[0012] Using the above solution, the spring block in this solution is made of polyurethane. Polyurethane blocks have good elasticity and flexibility, and can provide a gentler and more uniform buffer during the reset process, which can avoid impact on parts and molds, reduce damage to parts and wear on molds, and is especially suitable for impact-sensitive parts. The shape and size of the polyurethane block can be customized according to the mold structure, and the installation is relatively convenient. It does not require complicated fixing devices and is usually fixed by adhesive bonding, which can simplify the mold structure and reduce the mold manufacturing and maintenance costs.

[0013] Preferably, the second reset component includes a top block that is movably disposed in the clearance hole and is pushed into the clearance hole by the punch head when the upper die is pressed down, and a second elastic member that drives the top block to gradually extend elastically until its end is partially exposed in the clearance hole when the punch head is withdrawn from the clearance hole.

[0014] Preferably, the upper die includes a first template and a second template that are fixedly connected to each other. The second template is located between the first template and the lower die. The clearance hole includes a blind hole section opened on the first template and a through hole section opened on the second template that is aligned with the blind hole section and has a diameter smaller than the blind hole section. The through hole section abuts against the top block to prevent it from completely disengaging from the clearance hole. A reserved space is formed between the inner wall of the through hole section and the outer wall of the stamping head for the part to fold into.

[0015] Using the above scheme, the clearance hole is divided into a blind hole section on the first template and a through hole section on the second template. This hole opening method is relatively simple and common, and the through hole section forms an effective limit with the top block, preventing the top block from completely leaving the clearance hole.

[0016] Preferably, the outer diameter of the stamping head increases gradually from top to bottom, with each stage transitioning through a conical surface.

[0017] Using the above scheme, when the above structure is used to turn holes in parts, the outer diameter of the stamping head increases step by step, which can process the initial hole to the final size in one go, reducing the processing steps and time. When combined with the demolding mechanism in this scheme, it can also greatly reduce the difficulty of demolding.

[0018] Preferably, the sizing die includes a lubrication assembly for lubricating the punch head. The lubrication assembly includes an oil reservoir on the top block, an oil outlet connecting the oil reservoir and the punch head, and an opening and closing component that is driven by the punch head to open the oil outlet when the upper die is pressed down or elastically resets and closes the oil outlet when the upper die is raised. The upper die is provided with an oil supply component that supplies lubricating oil to the oil reservoir through a connecting clearance hole.

[0019] The above-mentioned solution adds a function to the existing punching die to lubricate the punch head when the upper and lower dies are closed. This solution uses an oil supply component to continuously supply oil to the oil reservoir on the top block at a preset oil supply speed. The lifting or lowering action of the punch head causes the opening and closing component to open or close the oil outlet. This allows the lubricating oil in the oil reservoir to flow through the oil outlet at a certain point in the punching process and drip onto the punch head for immediate lubrication. This reduces the wear caused by dry friction during the punching process. After the gap between the punch head and the part is filled with lubricating oil, it is easier to demold, reducing the wear on the inner wall of the hole caused by friction between the part and the punch head during demolding.

[0020] Preferably, the opening and closing component includes a rod that is guided and telescopically disposed in the oil outlet and driven upward by the punch head, and a third elastic element that drives the rod to descend when the punch head exits the clearance hole. One end of the oil outlet that connects to the oil storage tank is formed with an inclined drainage port. The end of the rod is formed with a sealing end that can block or expose the drainage port when the rod is raised or lowered. A limiting structure is provided between the rod and the top block to limit the maximum lifting distance of the rod.

[0021] As a preferred embodiment, the limiting structure includes a pin that passes laterally through the rod, and a limiting groove is provided on the top block for the pin to abut against and drive the top block to rise synchronously after the pin rises with the rod to the maximum lifting distance.

[0022] In the previous scheme, when the upper and lower dies were closed, the punch head would first abut against the ejector block. At this time, the part of the punch head that was in contact with the part was in the process of gradually transitioning from the smallest outer diameter to the largest outer diameter, which was the hole expansion stage. Then the ejector block was pushed into the relief groove. In this scheme, the punch head would first contact the rod before pushing the ejector block. The rod would rise and open the drain port, allowing the lubricating oil to flow through the drain groove, through the oil outlet, and finally drip onto the punch head. When the rod rose to the point where the pin abutted the limiting groove, it would drive the ejector block to rise together to avoid the punch head. When the upper and lower dies separated, when the ejector block moved to abut the opening of the through hole section, as the punch head continued to withdraw from the relief hole, the rod was driven by the third elastic element to descend and block the drain port.

[0023] Based on the above process, it can be seen that the lubrication component of this solution can drip oil onto the stamping head at the moment when the stamping head just begins to enlarge the hole but before the material around the initial hole is completely folded upwards. At this moment, the initial hole on the part has just been lifted by the stamping head, and the area around the initial hole forms an upward curve with a certain arc. At this time, the dripping lubricating oil can flow along the gap between the stamping head and the initial hole. While wetting the stamping head, it can also flow along the arc of the upward curve around the initial hole, causing lubricating oil to accumulate in the area around the initial hole that is about to fold upwards to form a flange. This ensures that there is always sufficient lubrication between the stamping head and the area of ​​the part that will subsequently fold upwards. This reduces stamping wear and ensures smooth demolding. If lubrication is performed before hole enlargement, the part is in a flat state, and even if the lubricating oil drips between the stamping head and the initial hole, it is difficult to flow in the area around the initial hole, and the above-mentioned lubrication effect cannot be achieved.

[0024] Considering that the timed oil supply function of common oil supply devices relies on PLC program control, it is necessary to precisely control the oil supply timing during programming to match the production rhythm. However, the opening and closing of the mold and the coordination between various mold components will inevitably have certain errors. When multiple errors accumulate, they will form a significant error, ultimately causing the oil supply device to fail to accurately grasp the lubrication timing. In this solution, the lubrication component achieves the purpose of grasping the lubrication timing through mechanical coordination. Furthermore, the oil supply component provides continuous oil supply, ensuring that there is a certain amount of lubricating oil in the oil reservoir. This guarantees that the lubrication component can accurately grasp the lubrication timing, improves the lubrication effect when the stamping head is working, thereby reducing the wear of various mold components, improving the quality of parts, and reducing the difficulty of demolding.

[0025] Preferably, the inner wall of the oil outlet is provided with several drainage grooves that connect to the drainage ports at intervals around the circumference.

[0026] By adopting the above scheme, several drainage channels allow the lubricating oil to drip evenly, achieving a uniform lubrication effect.

[0027] Preferably, the top of the opening and closing component has a mating protrusion to prevent lubricant accumulation.

[0028] With the above solution, when the lubricating oil drips onto the opening and closing component, it can flow along the mating protrusion into the oil reservoir, reducing the phenomenon of lubricating oil accumulating on the top of the opening and closing component after the oil outlet is opened.

[0029] This utility model has significant technical effects due to the adoption of the above technical solutions: This solution is provided with a dual demolding mechanism at the stamping head and the clearance hole, namely a first reset component and a second reset component, which demold the part from two different directions. The first reset component uses the spring force to push the part away from the stamping head, while the second reset component pushes the flange formed in the clearance hole after the part is turned out of the clearance hole, thereby effectively solving the problem of inconvenient demolding and greatly improving demolding efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the external structure of a self-demolding perforating mold in Example 1;

[0031] Figure 2 This is a right view of a self-demolding perforated mold according to Embodiment 1;

[0032] Figure 3 yes Figure 2 A sectional view of AA in the middle;

[0033] Figure 4 yes Figure 3 A magnified view of a portion of A1;

[0034] Figure 5 yes Figure 3 A diagram showing the state changes of a self-demolding perforated mold during mold closing;

[0035] Figure 6 yes Figure 5 A magnified view of the portion related to B in the image;

[0036] Figure 7 This is a schematic diagram of the structure of a self-demolding perforating mold in Example 1 after processing and separation of the upper and lower molds;

[0037] Figure 8 This is a front view of a self-demolding perforated mold in Embodiment 2;

[0038] Figure 9 yes Figure 8 A sectional view of CC in the middle;

[0039] Figure 10 yes Figure 9 A magnified view of C1 in the image;

[0040] Figure 11 yes Figure 8 A diagram showing the state changes of a self-demolding perforated mold during mold closing;

[0041] Figure 12 yes Figure 11 A magnified view of a portion of D in the image;

[0042] Figure 13 This is a schematic diagram of the top block in Embodiment 2.

[0043] The parts referred to by the numbers in the above attached figures are as follows: 1. Part; 2. Upper die; 201. First template; 202. Second template; 3. Lower die; 4. Punch head; 5. Clearance hole; 501. Blind hole section; 502. Through hole section; 6. Pad plate; 7. First elastic element; 8. Top block; 9. Second elastic element; 10. Oil reservoir; 11. Oil outlet; 12. Drainage port; 13. Rod body; 1301. Sealing end; 1302. Pin; 14. Limiting groove; 15. Third elastic element; 16. Drainage groove; 17. Oil injection hole. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0045] Example 1

[0046] A self-demolding perforating mold, according to Figure 1 , 7 As shown, it includes an upper die 2 and a lower die 3. The lower die 3 is provided with a punch head 4. According to Figure 4 As shown, the outer diameter of the stamping head 4 increases gradually from top to bottom, with each level transitioning through a conical surface. The upper die 2 has a clearance hole 5 for the stamping head 4 to extend into. This is the prior art, and will not be described in detail in this embodiment.

[0047] The improvement in this embodiment is that a first reset component is provided on the lower mold 3, according to... Figure 1 , 3As shown in Figure 5, the first reset assembly includes a pad 6 for placing part 1. The pad 6 is guided and lifted on the lower mold 3. A first elastic element 7 is provided between the pad 6 and the lower mold 3. The first elastic element 7 includes a spring block with good elastic deformation capability and good springback reset capability after deformation. In this embodiment, the spring block is made of polyurethane. When the upper mold 2 is pressed down, the spring block is pressed against the upper mold 2 and compressed downward to reduce its height. At this time, the spring block is in a flattened state and the outer wall expands in all directions. When the upper mold 2 rises, the spring block resets to its initial state by its own springback capability. Figure 3 , 5 As shown, in this embodiment, both sides of part 1 need to be perforated. A punch head 4 is provided on each side of the pad 6, and a spring block is also distributed on each side of the pad 6. After the punch head 4 passes through the spring block and the pad 6, its top slightly extends beyond the pad 6. When part 1 is placed on the pad 6, the initial hole is aligned with the two punch heads 4 to complete the calibration. In this embodiment, the spring block is fixed to the lower die 3 and the pad 6 by adhesive.

[0048] A second reset component is provided inside the clearance hole 5, according to Figure 3 , 5 As shown, the second reset component includes a top block 8 movably disposed within the clearance hole 5. When the upper die 2 is pressed down, the top block 8 is pushed into the clearance hole 5 by the punch head 4. A second elastic element 9 is disposed within the clearance hole 5. In this embodiment, the second elastic element 9 is a spring disposed between the bottom of the clearance hole 5 and the top block 8. When the punch head 4 exits the clearance hole 5, the second elastic element 9 drives the top block 8 to gradually extend elastically until its end partially protrudes from the clearance hole 5. Figure 5 , 6 As shown, in this embodiment, the upper mold 2 includes a first template 201 and a second template 202 that are fixedly connected to each other. The second template 202 is located between the first template 201 and the lower mold 3. The clearance hole 5 includes a blind hole section 501 opened on the first template 201 and a through hole section 502 opened on the second template 202 that is aligned with the blind hole section 501 and has a diameter smaller than the blind hole section 501. The through hole section 502 abuts against the top block 8 to restrict it from completely disengaging from the clearance hole 5. A reserved space is formed between the inner wall of the through hole section 502 and the outer wall of the stamping head 4 for the part 1 to fold into.

[0049] Based on the above structure, it can be seen that the self-demolding flipping mold in this embodiment is provided with a first reset component and a second reset component at the punch head 4 and the clearance hole 5. The two reset components perform demolding operations on the part 1 from two different directions. The first reset component uses the spring force to push the part 1 away from the punch head 4, while the second reset component pushes the flange formed in the clearance hole 5 after the part 1 is flipped out of the clearance hole 5, thereby effectively solving the problem of inconvenient demolding and greatly improving demolding efficiency.

[0050] Example 2

[0051] Based on Embodiment 1, this embodiment further defines a self-demolding flanging die, which includes a lubrication assembly for lubricating the punch head 4. Figure 10 The lubrication assembly shown includes an oil reservoir 10 on the top block 8, an oil outlet 11 connecting the oil reservoir 10 and the stamping head 4, and an opening / closing component inside the top block 8 for opening or closing the oil outlet 11. Figure 10 , 12 As shown, the opening and closing component includes a rod 13 that is guided and telescopically arranged inside the oil outlet 11. One end of the oil outlet 11, which is connected to the oil storage tank 10, forms an inclined drain port 12. The end of the rod 13 forms a sealing end 1301 that can block or expose the drain port 12 when the rod 13 rises or falls. A pin 1302 is transversely inserted at the end of the rod 13 away from the sealing end 1301. A limiting groove 14 is provided on the top block 8 for the pin 1302 to abut against. When the upper die 2 is pressed down, the rod 13 is driven upward by the punch head 4. When the pin 1302 rises with the rod 13 to the maximum lifting distance, the pin 1302 abuts against the limiting groove 14 and drives the top block 8 to rise synchronously. The descent of the rod 13 is controlled by the third elastic element 15, according to Figure 12 As shown, in this embodiment, the oil outlet 11 is a stepped hole, with the smaller diameter step engaging with the rod 13. The third elastic element 15 is a spring sleeved on the rod 13 and located between the stepped surface of the oil outlet 11 and the pin 1302. The elastic force of the second elastic element 9 is much greater than that of the third elastic element 15. When the upper die 2 rises, the punch head 4 exits the clearance hole 5. At this time, the rod 13 is driven by the third elastic element 15 to descend and block the drain port 12. Figure 13 As shown, the inner wall of the oil outlet 11 is provided with several drainage grooves 16 spaced apart in the circumferential direction. In this embodiment, the drainage grooves 16 are distributed on the smaller diameter section of the oil outlet 11, one end of which is connected to the drainage port 12 and the other end is connected to the stepped surface. Since the smaller diameter section of the oil outlet 11 is guided and matched with the rod 13, when the rod 13 is lifted upward, the lubricating oil can rely on the drainage grooves 16 to accelerate downward flow, thereby speeding up the response speed of instant lubrication.

[0052] The upper mold 2 is provided with an oil supply component (not shown in the figure) that feeds lubricating oil into the oil storage tank 10 through a connecting clearance hole 5. In this embodiment, the oil supply component adopts a needle valve type oil cup with specifications of JB / T 7940.6-1995. The first template 201 is provided with an oil injection hole 17 that communicates with the blind hole section 501. The output end of the needle valve type oil cup can be connected to the oil injection hole 17 through a pipeline. When using the needle valve type oil cup, the oil output speed of the oil cup can be adjusted according to the lubricating oil demand of the stamping head 4 and the part 1, which is very convenient. Although the oil output mode of the needle valve type oil cup is continuous oil output, the oil storage tank 10 on the top block 8 in this embodiment has a certain oil storage capacity, which complements the needle valve type oil cup.

[0053] Based on the above structure, refer to Figures 8-13 It can be seen that the self-demolding flipping mold in this embodiment adds a lubrication function on the basis of embodiment 1. It can drip oil onto the punch head at the moment when the punch head just starts to expand the hole but has not yet completely flipped the material around the initial hole upward. At this moment, the initial hole on the part has just been lifted by the punch head, and the area around the initial hole forms an upward trend with a certain arc. At this time, the dripping lubricating oil can flow along the gap between the punch head and the initial hole. While wetting the punch head, it can flow along the arc of the upward area around the initial hole, so that the area around the initial hole that is about to be flipped upward to form a flange will accumulate lubricating oil. This can ensure that there is always sufficient lubrication between the punch head and the area of ​​the part that will be flipped upward later. It can reduce the wear caused by dry friction during the punching process of the punch head. Moreover, after the gap between the punch head and the part is filled with lubricating oil, it is easier to demold. It can also reduce the wear of the inner wall of the hole caused by the friction between the part and the punch head during the demolding process.

[0054] Considering that the process of lubricating oil flowing from the oil reservoir to the stamping head takes a certain amount of time, the mold closing action is divided into two steps in this embodiment. When the mold closes to the point where the stamping head drives the area around the initial hole to tilt upwards, it will pause for 2 to 4 seconds. In actual operation, the pause time needs to be adjusted according to the viscosity and flow rate of the lubricating oil. After the pause, the mold closes again to complete the remaining hole turning process.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-demolding perforating mold, comprising an upper mold (2) and a lower mold (3), wherein a punch head (4) is protruding from the lower mold (3), and an clearance hole (5) is formed on the upper mold (2) for the punch head (4) to extend into, characterized in that: It also includes a dual ejection mechanism that pushes the part (1) away from the stamping head (4) and ejects it from the clearance hole (5) when the upper die (2) and lower die (3) separate. The dual ejection mechanism includes: The first reset component is set on the lower die (3) and has a mounting position for the part (1) to be installed. When the upper die (2) is pressed down, the first reset component is compressed by the upper die (2) to deform and the stamping head (4) gradually exceeds the mounting position. When the upper die (2) is raised, the first reset component gradually springs back to the initial state and uses the spring force to push the part (1) away from the stamping head (4). The second reset component is located in the clearance hole (5). When the upper die (2) is pressed down, the end of the punch head (4) abuts against the second reset component and drives it to elastically compress into the clearance hole (5). When the upper die (2) rises, as the punch head (4) exits the clearance hole (5), the second reset component gradually extends outward until the part (1) is pushed out of the clearance hole (5).

2. The self-demolding perforating mold according to claim 1, characterized in that: The first reset assembly includes a pad (6) for placing part (1) which is guided and lifted on the lower mold (3), and a first elastic element (7) disposed between the pad (6) and the lower mold (3).

3. The self-demolding perforating mold according to claim 2, characterized in that: The first elastic element (7) includes a spring block that compresses downward to reduce the height when the upper mold (2) is pressed down and returns to the initial state by its own springback capability when the upper mold (2) is raised. The spring block is made of a material with good elastic deformation capability and good springback reset capability after deformation.

4. The self-demolding perforating mold according to claim 1, characterized in that: The second reset component includes a top block (8) that is movably disposed in the clearance hole (5) and is pushed into the clearance hole (5) by the punch head (4) when the upper die (2) is pressed down, and a second elastic element (9) that drives the top block (8) to gradually extend elastically until the end of the clearance hole (5) is partially exposed when the punch head (4) is withdrawn from the clearance hole (5).

5. A self-demolding perforating mold according to claim 4, characterized in that: The upper mold (2) includes a first template (201) and a second template (202) that are fixedly connected to each other. The second template (202) is located between the first template (201) and the lower mold (3). The clearance hole (5) includes a blind hole section (501) opened on the first template (201) and a through hole section (502) opened on the second template (202) that is aligned with the blind hole section (501) and has a diameter smaller than the blind hole section (501). The through hole section (502) abuts against the top block (8) to restrict it from completely disengaging from the clearance hole (5). A reserved space is formed between the inner wall of the through hole section (502) and the outer wall of the stamping head (4) for the part (1) to be folded into.

6. The self-demolding perforating mold according to claim 1, characterized in that: The outer diameter of the stamping head (4) increases gradually from top to bottom, with each level transitioning through a conical surface.

7. A self-demolding perforating mold according to claim 4, characterized in that: The swivel die includes a lubrication assembly for lubricating the punch head (4). The lubrication assembly includes an oil reservoir (10) provided on the top block (8), an oil outlet (11) connecting the oil reservoir (10) and the punch head (4), and an opening and closing component that opens the oil outlet (11) when the upper die (2) is pressed down and is driven by the punch head (4) or elastically resets and closes the oil outlet (11) when the upper die (2) is raised. The upper die (2) is provided with an oil supply component that supplies lubricating oil to the oil reservoir (10) through a connecting clearance hole (5).

8. A self-demolding perforating mold according to claim 7, characterized in that: The opening and closing components include a rod (13) that is guided and telescopically disposed in the oil outlet (11) and driven upward by the punch head (4), and a third elastic element (15) that drives the rod (13) to descend when the punch head (4) exits the clearance hole (5). One end of the oil outlet (11) that connects to the oil storage tank (10) is provided with an inclined drain port (12). The end of the rod (13) is provided with a sealing end (1301) that can block or expose the drain port (12) when the rod (13) rises or falls. A limiting structure is provided between the rod (13) and the top block (8) to limit the maximum lifting distance of the rod (13).

9. A self-demolding perforating mold according to claim 8, characterized in that: The limiting structure includes a pin (1302) that passes laterally through the rod (13), and a limiting groove (14) on the top block (8) that allows the pin (1302) to abut against and drive the top block (8) to rise synchronously after the pin (1302) rises with the rod (13) to the maximum lifting distance.

10. A self-demolding perforating mold according to claim 8, characterized in that: The inner wall of the oil outlet (11) is provided with several drainage grooves (16) that connect to the drainage ports (12) at intervals around the periphery.

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