Liquid absorption core stamping die, stamping machining method and liquid absorption core

Abstract

The invention relates to the field of stamping dies, in particular to a wick stamping die, a stamping machining method and a wick. The die comprises a stamping and puncturing upper die core, a blowing and flattening upper die core, a stamping and puncturing lower die core and a blowing and flattening lower die core. The stamping and piercing upper die core is provided with a plurality of first stamping columns which are arranged in a matrix mode and provided with piercing ends, the stamping and piercing lower die core is provided with a plurality of first holes, and each first stamping column is used for being matched with the corresponding first hole in the die assembly process to form a first curved surface with a first piercing hole in a stamping mode on a material belt; the blowing and flattening upper mold core is provided with first blowing holes in one-to-one correspondence with the first curved surfaces, the position, directly facing each first curved surface, of the blowing and flattening lower mold core is a plane, and in the mold closing process, the blowing and flattening upper mold core blows air through the first curved surfaces of the first blowing holes, and flattens the multiple first curved surfaces after blowing and flattening the lower mold core. On the premise of improving the fluid through capacity of the liquid absorption core, it can be guaranteed that the first curved surfaces are equal in height, and the product quality is improved.

Description

Technical Field

[0001] This invention relates to the field of stamping dies, specifically to a liquid suction core stamping die and stamping method, and a liquid suction core. Background Technology

[0002] In heat dissipation devices involving two-phase flow heat transfer, such as vapor chambers or heat pipes, the working fluid absorbs heat and vaporizes in the evaporation section. The vapor then flows to the condensation section, releasing heat and liquefying. The liquid working fluid must be driven by capillary force to flow back from the condensation section to the evaporation section to maintain a continuous phase change cycle. Therefore, a microstructure (i.e., a capillary structure) that provides efficient and stable capillary driving force is the core and key to achieving efficient heat transfer in such heat dissipation devices.

[0003] Currently, the capillary structure commonly used in the industry is a porous mesh structure woven from metal wires (such as copper or stainless steel wires). This type of wire mesh structure forms interconnected pores through a weaving process, possessing certain capillary properties. However, it has inherent drawbacks such as complex manufacturing processes, low production efficiency, poor structural consistency, weak mechanical strength, and insufficient reliability in connection with the shell.

[0004] To overcome the shortcomings of the aforementioned wire mesh structure, the applicant of this patent previously proposed an improvement: using a precision stamping die, the upper die assembly having multiple micro-pillars with piercing ends, and the lower die assembly having corresponding mating holes. During die-cutting, the mating holes and the pillars work together to first stamp a flange onto the metal strip, then pressure is applied until the stamping force exceeds the material's ductility limit, thereby piercing the metal strip with the piercing ends to create tiny holes on the flange surface, and simultaneously forming an array of bulges with central piercing holes on the strip. Using a stamping die improves production efficiency, and the stamped structure aims to replace wire mesh, achieving superior processability and structural strength.

[0005] However, this stamping forming scheme faces a technical problem in practical implementation: due to the extremely small size of the pillars constituting the core of the bulge forming (diameter on the order of millimeters, or even fractions of a millimeter), the limitations of current machining precision make it difficult to ensure that the absolute dimensions of the hundreds, thousands, or even tens of thousands of densely arranged micro-pillars in the mold are uniform and that their tops are absolutely coplanar. Furthermore, minute deviations in mold assembly and subtle differences in sheet metal flow during stamping further amplify this error. This results in inconsistent actual heights of the bulges on the stamped liquid-absorbing core, exhibiting a significant random distribution and failing to achieve an ideal uniformity. This height inconsistency has serious consequences: (1) Affects assembly and finished product thickness: When assembling the capillary plate with the upper and lower housings of the heat dissipation device (such as welding or brazing), uneven bulge height will lead to uneven local contact pressure, affecting the packaging quality and making it difficult to control the overall thickness of the heat dissipation device within the design tolerance range.

[0006] (2) Risk of heat dissipation failure: Inconsistent bump height means that the cross-sectional dimensions of the fluid channels inside the capillary structure are uneven, which may hinder the uniform distribution and smooth return of the liquid working fluid. In some areas, excessively low bumps may lead to insufficient capillary force, and the returned liquid cannot be effectively supplied to the evaporation section, thus causing the area to dry out; while excessively high bumps may be over-crushed during encapsulation, damaging the capillary structure. All of these will seriously weaken or even interrupt the two-phase flow circulation, ultimately leading to a decrease in the performance of the heat dissipation device or complete failure.

[0007] Therefore, how to ensure the consistency of the height of the numerous protrusions on the surface of corrugated curved panels (liquid absorbers) while achieving high efficiency and low cost in mass production has become a key technical problem that needs to be solved to improve the reliability of this type of capillary structure and promote its widespread application in high-performance heat dissipation devices. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a liquid suction core stamping die that can ensure that multiple first curved surfaces are at the same height while improving the fluid penetration capacity of the liquid suction core, thereby improving the product quality of the heat dissipation device to which the liquid suction core is applied.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a liquid-absorbing core stamping die, comprising an upper template assembly and a lower template assembly, further comprising a stamping and piercing upper die core disposed on the upper template assembly and an air-blowing and flattening upper die core, and a stamping and piercing lower die core disposed on the lower template assembly and an air-blowing and flattening lower die core; wherein, The upper die core for stamping and piercing is provided with a plurality of first stamping pillars with piercing ends arranged in a matrix. The lower die core for stamping and piercing is provided with a first hole corresponding to each of the first stamping pillars. Each first stamping pillar is used to cooperate with the corresponding first hole during the die closing process to stamp a first curved surface with a first piercing hole on the strip. The upper mold core for blowing and flattening is provided with a first air blowing hole that corresponds one-to-one with the first curved surface. The lower mold core for blowing and flattening is in a plane position facing each first curved surface. During the mold closing process, the upper mold core for blowing and flattening first blows air to the corresponding first curved surface through its first air blowing hole, and then the lower mold core for blowing and flattening flattens multiple first curved surfaces.

[0010] Furthermore, after the upper and lower mold components are closed in place, a preset interval is reserved between the air-blowing and flattening of the upper mold core and the air-blowing and flattening of the lower mold core.

[0011] Furthermore, the upper air cavity is provided inside the blow-flattening mold core, and each first blow-out hole is connected to the upper air cavity.

[0012] Furthermore, the diameter of the first air inlet is smaller than the opening diameter of the first curved surface.

[0013] Furthermore, the lower die core for stamping and piercing is provided with a plurality of second stamping pillars with piercing ends arranged in a matrix. The second stamping pillars are staggered with the first holes. The upper die core for stamping and piercing is provided with second holes that correspond one-to-one with the second stamping pillars. Each second stamping pillar is used to cooperate with the corresponding second hole during the die closing process to stamp a second curved surface with a second piercing hole on the strip. The lower mold core for blowing and flattening is provided with a second air blowing hole that corresponds one-to-one with the second curved surface. The upper mold core for blowing and flattening is in a plane position facing each of the second curved surfaces. During the mold closing process, the lower mold core for blowing and flattening first blows air onto the second curved surfaces through its second air blowing hole, and then the upper mold core for blowing and flattening flattens multiple second curved surfaces.

[0014] Furthermore, the lower mold core of the blow-blowing and flattening device is provided with a lower air cavity, and each second blow-blowing hole is connected to the lower air cavity.

[0015] This invention also relates to a stamping method based on a liquid-absorbing core stamping die, the method comprising: During mold closing process: As the upper die core moves down with the upper template assembly, each first stamping post mates with the corresponding first hole to stamp a downward-curved first surface on the strip and uses its piercing end to pierce the center of the first curved surface to form a first piercing hole. The upper mold core is blown and flattened as the upper template assembly moves downward. Each first air blowing hole blows air into the corresponding first curved surface, causing the waste material at the first puncture hole to turn outward. Then, the lower mold core is blown and flattened to flatten the multiple first curved surfaces that contact it.

[0016] This invention also relates to another stamping method based on a liquid-absorbing core stamping die, the method comprising: During mold closing process: As the upper die core moves downward with the upper template assembly, each first stamping post mates with the corresponding first hole to stamp a downward-curved first surface on the strip and punctures the center of the first surface with its puncturing end to form a first puncture hole; at the same time, each second stamping post mates with the corresponding second hole to stamp a upward-curved second surface on the strip and punctures the center of the second surface with its puncturing end to form a second puncture hole. The upper mold core is flattened by air blowing as it moves down with the upper template assembly. Each first air blowing hole blows air onto the corresponding first curved surface, causing the waste material at the first puncture hole to turn outward. Each second air blowing hole blows air onto the corresponding second curved surface, causing the waste material at the second puncture hole to turn outward. Then, the lower mold core is flattened by air blowing onto its multiple first curved surfaces, and the upper mold core is flattened by air blowing onto its multiple second curved surfaces.

[0017] Furthermore, the first air inlet blows air onto the corresponding first curved surface and the second air inlet blows air onto the corresponding second curved surface, in a time-sharing manner.

[0018] The present invention also relates to a liquid-absorbing core, which is manufactured by stamping using the aforementioned stamping method.

[0019] After adopting the above technical solution, when the strip passes through the stamping and piercing station, the first stamping post of the upper stamping and piercing die core and the first hole of the lower stamping and piercing die core cooperate to first stamp a flange on the strip. Then, pressure is continued to be applied, so that the stamping force applied to the strip exceeds the ductility limit of the strip material. This allows the strip to be pierced by the piercing end, obtaining a tiny hole on the flange surface, thus obtaining a first curved surface with the first piercing hole. By forming the first piercing hole by piercing, the generated fine waste does not detach from the strip, but remains attached to the edge of the first piercing hole, often clustered in the center. Furthermore, during the process of the first stamping post detaching from the strip, it may carry the waste material into the hole. After passing through the air blowing and flattening station, air is blown from each first air blowing hole onto the first curved surface. The airflow causes the waste material at the first puncture hole to turn outward and diverge in the circumferential direction before being flattened. This not only solves the problem of uneven heights of multiple first curved surfaces formed by the stamping and puncturing station affecting assembly and finished product thickness, as well as the risk of heat sweeping failure, but also solves the problem of blockage caused by the accumulation of fine waste material at the edge of the first puncture hole. This ensures the flow capacity of the working fluid, improves the quality of the stamped liquid-absorbing core, facilitates the assembly of the heat dissipation device used in the liquid-absorbing core, ensures that the overall thickness of the heat dissipation device is controlled within the design tolerance range, and improves the capillary transport efficiency and overall heat dissipation performance of the heat dissipation device used in the liquid-absorbing core, meeting the requirements of two-phase cycle stability for high-power heat dissipation scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a liquid suction core stamping die; Figure 2 for Figure 1 A cross-sectional view of the liquid suction core stamping die; Figure 3 for Figure 1 A schematic diagram of the upper die assembly of the liquid suction core stamping die; Figure 4 for Figure 1 A schematic diagram of the lower die assembly of the liquid suction core stamping die; Figure 5 To utilize Figure 1 A diagram showing the state changes of the liquid-absorbing core stamped by the mold in the diagram; Figure 6 A cross-sectional view of another type of liquid-absorbing core stamping die; Figure 7 for Figure 6 A schematic diagram of the upper die assembly of the liquid suction core stamping die; Figure 8 for Figure 6 A schematic diagram of the lower die assembly of the liquid suction core stamping die; Figure 9 For based on Figure 6 A diagram showing the state changes of the liquid-absorbing core stamped by the mold in the diagram; Figure 10 For based on Figure 6 3D scan of the suction core stamped by the suction core stamping die in the middle; In the diagram, 1 is the upper template assembly; 2 is the lower template assembly; 3 is the stamping piercing of the upper mold core; 31 is the first stamping pillar; 32 is the second hole; 4 is the air blowing flattening of the upper mold core; 41 is the first air blowing hole; 42 is the upper air cavity; 5 is the stamping piercing of the lower mold core; 51 is the first hole; 52 is the second stamping pillar; 6 is the air blowing flattening of the lower mold core; 61 is the second air blowing hole; 62 is the lower air cavity; 10. Material strip; 20. First curved surface; 201. First puncture hole; 30. Second curved surface; 301. Second puncture hole. Detailed Implementation

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Given the inconsistent heights of the various protrusions (curved surfaces) in the stamping dies mentioned in the background art, the inventors attempted to improve the uniformity of protrusion height by adding a flattening process to the die. Specifically, after stamping to form an array of protrusions with puncture holes, the product is flattened as a whole in a subsequent station using upper and lower flat plates. However, the fine waste generated at the edges of the puncture holes tends to accumulate in the center, and during the process of the column detaching from the material strip, it may carry the waste into the hole, exacerbating the risk of blockage. When flattening with flat plates is used in the subsequent process, the accumulated waste is squeezed and bent towards the inside of the puncture hole, resulting in a significant reduction or even complete closure of the effective flow area of ​​the puncture opening. This directly weakens the penetration capacity of the working fluid, hinders the timely return of liquid to the evaporation section, severely reduces the transport efficiency of the capillary structure and the overall heat dissipation performance, and fails to meet the requirements of two-phase circulation stability in high-power heat dissipation scenarios.

[0023] Based on this, the following specific embodiments are improved to obtain the solution.

[0024] Example 1: As Figures 1 to 5 As shown, a liquid-absorbing core stamping die includes an upper template assembly 1 and a lower template assembly 2, and further includes a stamping piercing upper die core 3 and an air-blowing flattening upper die core 4 disposed on the upper template assembly 1, and a stamping piercing lower die core 5 and an air-blowing flattening lower die core 6 disposed on the lower template assembly 2; wherein, The upper die core 3 for stamping and piercing is provided with a plurality of first stamping pillars 31 with piercing ends arranged in a matrix. The lower die core 5 for stamping and piercing is provided with a first hole 51 corresponding to the first stamping pillars 31. Each first stamping pillar 31 is used to cooperate with the corresponding first hole 51 during the mold closing process to stamp a first curved surface 20 with a first piercing hole 201 on the strip 10; the piercing end is conical. The upper mold core 4 is provided with a first air blowing hole 41 that corresponds one-to-one with the first curved surface 20. The lower mold core 6 is flat in the position of each first curved surface 20. During the mold closing process, the upper mold core 4 first blows air to the corresponding first curved surface 20 through its first air blowing hole 41, and then the lower mold core 6 flattens multiple first curved surfaces 20.

[0025] The entire liquid-absorbing core stamping die has two stations along the 10-meter feed direction of the strip: a stamping and piercing station and an air-blowing and flattening station. For example... Figure 5 As shown, the stamping process method based on the liquid-absorbing core stamping die in this embodiment includes: With a 10-feed strip, during each mold closing process: At the stamping and piercing station, the stamping and piercing upper die core 3 moves down with the upper template assembly 1. Each first stamping column 31 cooperates with the corresponding first hole 51 to stamp a downward curved surface 20 on the strip 10, and uses its piercing end to pierce the center of the first curved surface 20 to form a first piercing hole 201. At the air blowing and flattening station, the upper mold core 4 moves down with the upper template assembly 1, and each first air blowing hole 41 blows air into the corresponding first curved surface 20, causing the waste material at the first puncture hole 201 to turn outward. Then the lower mold core 6 blows air and flattens the multiple first curved surfaces 20 that are in contact with it.

[0026] It is important to note that Figure 5 The diagrams shown are only intended to vividly illustrate the various processes involved in stamping the liquid-absorbing core onto the strip 10. The dimensional relationships between the aperture, height, and thickness of the first curved surface 20, as well as the liquid-absorbing core, do not represent the actual situation of the liquid-absorbing core.

[0027] Specifically, when the strip 10 passes through the stamping and piercing station, a flange is first formed on the strip 10 by the cooperation of the first stamping post 31 and the first hole 51. Then, pressure is continued to be applied so that the stamping pressure applied to the strip 10 exceeds the material's ductility limit, thereby piercing the strip 10 with the piercing end to obtain a tiny hole on the flange surface, thus obtaining the first curved surface 20 with the first piercing hole 201. The formation of the first piercing hole 201 by piercing does not cause the generated fine waste to detach from the strip and remain connected to the edge of the first piercing hole 201. However, the fine waste at the edge of the first piercing hole 201 tends to be centrally concentrated, and during the process of the first stamping post 31 detaching from the strip 10, it may carry the waste into the hole, increasing the risk of blockage. Therefore, an air blowing and flattening station is added. After passing through the air blowing and flattening station, each first air blowing hole 41 blows air onto the first curved surface 20. The airflow causes the waste material at the first puncture hole 201 to turn outward and diverge in the circumferential direction before being flattened. This not only solves the problem of the multiple first curved surfaces 20 formed by the stamping and puncturing station affecting the assembly and finished product thickness due to their different heights, as well as the risk of heat sweep failure, but also solves the problem of the risk of blockage caused by the accumulation of fine waste material at the edge of the first puncture hole 201. This ensures the flow capacity of the working fluid, improves the quality of the stamped liquid suction core, facilitates the assembly of the heat dissipation device used in the liquid suction core, ensures that the overall thickness of the heat dissipation device is controlled within the design tolerance range, and improves the capillary transport efficiency and overall heat dissipation performance of the heat dissipation device used in the liquid suction core, meeting the requirements of two-phase cycle stability for high-power heat dissipation scenarios.

[0028] The upper template assembly 1 includes, from top to bottom, an upper mold base, an upper backing plate, a clamping plate, a stop plate, and an upper stripper plate. The upper template assembly 1, together with the stamping and piercing upper mold core 3 and the air-blowing and flattening upper mold core 4, constitutes the upper mold assembly. The lower template assembly 2 includes, from bottom to top, a lower mold base, a lower backing plate, a lower template, and a lower stripper plate. The lower template assembly 2, together with the stamping and piercing lower mold core 5 and the air-blowing and flattening lower mold core 6, constitutes the lower mold assembly.

[0029] In addition, in this embodiment, since the first stamping post 31 is on top and the first hole 51 is on the bottom, the first curved surface 20 is bent downwards. It can also be adjusted so that the first stamping post 31 is on the bottom and the first hole 51 is on top, and the upper mold core 5 and the lower mold core 6 are also adjusted accordingly, so that the first curved surface 20 bends upwards.

[0030] In this embodiment, as Figure 2 As shown, after the upper mold plate component 1 and the lower mold plate component 2 are closed in place, a preset interval is reserved between the upper mold core 4 and the lower mold core 6, which are flattened by air blowing.

[0031] This avoids over-pressure deformation or even damage to the first curved surface 20 formed by stamping on the strip 10 due to the flattening process. The spacing is determined by the thickness of the liquid-absorbing core being stamped.

[0032] In this embodiment, as Figure 2 As shown, the upper air cavity 42 is provided inside the air-blowing and flattening mold core 4, and each first air-blowing hole 41 is connected to the upper air cavity 42. The air-blowing and flattening mold core 4 may include, but is not limited to, a main body and an air vent plate. The main body has a recessed portion, and the air vent plate is mounted on the main body, sealing the recessed portion to form the upper air cavity 42. The first air-blowing holes 41 are located on the air vent plate. An external air source is connected to the upper air cavity 42 through an air duct provided on the main body. The air duct may include a vertical channel facing the center of the recessed portion and a horizontal channel connecting to the vertical channel; the external air source is connected to the horizontal channel. The air vent plate and the main body can be sealed with a sealing ring or with sealant.

[0033] In this embodiment, preferably, the diameter of the first air hole 41 is smaller than the opening diameter of the first curved surface 20. This allows the airflow to be concentrated, better blowing out the fine waste material at the edge of the first puncture hole 201, and making the fine waste material at the edge of the first puncture hole 201 more diffuse in the circumferential direction.

[0034] In this embodiment, preferably, the surface roughness Ra of the upper stamping die 3 and the lower stamping die 5 is 0.2-0.3. This is mainly because if the surfaces of the upper stamping die 3 and the lower stamping die 5 are too slippery, the strip 10 may slide relative to the die under the stamping force during the stamping process, making it impossible to form the first puncture hole 21; if the surfaces of the upper stamping die 3 and the lower stamping die 5 are too rough, it will lead to failure to demold. A surface roughness Ra of 0.2-0.3 is a suitable value, which can ensure that the entire die can stably and reliably stamp out the liquid suction core.

[0035] Example 2: Figures 6 to 10 As shown, in this embodiment, based on the first embodiment, the lower die core 5 for stamping and piercing is provided with a plurality of second stamping columns 52 with piercing ends arranged in a matrix. The second stamping columns 52 are staggered with the first holes 51. The upper die core 3 for stamping and piercing is provided with second holes 32 corresponding to the second stamping columns 52. Each second stamping column 52 is used to cooperate with the corresponding second hole 32 during the mold closing process to stamp a second curved surface 30 with a second piercing hole 301 on the strip 10. The lower mold core 6, which is used for blowing and flattening, is provided with a second air hole 61 that corresponds one-to-one with the second curved surface 30. The upper mold core 4, which is used for blowing and flattening, is located on a plane opposite each second curved surface 30. During the mold closing process, the lower mold core 6 first blows air onto the second curved surface 30 through its second air hole 61, and then flattens multiple second curved surfaces 30 after blowing and flattening the upper mold core 4.

[0036] In this embodiment, as Figure 6 As shown, a lower air cavity 62 is provided inside the blown-flattened lower mold core 6, and each second blow hole 61 is connected to the lower air cavity 62. The lower air cavity 62 can be formed in the same way as the upper air cavity 42.

[0037] like Figure 9 As shown, the stamping process method based on the liquid-absorbing core stamping die in this embodiment includes: With a 10-feed strip, during each mold closing process: At the stamping and piercing station, the upper stamping and piercing die core 3 moves downward with the upper template assembly 1. Each first stamping post 31 cooperates with the corresponding first hole 51 to stamp a downwardly curved first surface 20 on the strip 10, and uses its piercing end to pierce the center of the first curved surface 20 to form a first piercing hole 201. At the same time, each second stamping post 52 cooperates with the corresponding second hole 32 to stamp a upwardly curved second surface 30 on the strip 10, and uses its piercing end to pierce the center of the second curved surface 30 to form a second piercing hole 301. At the air blowing and flattening station, the upper mold core 4 moves down with the upper template assembly 1. Each first air blowing hole 41 blows air into the corresponding first curved surface 20, causing the waste material at the first puncture hole 201 to turn outward. Each second air blowing hole 61 blows air into the corresponding second curved surface 30, causing the waste material at the second puncture hole 301 to turn outward. Then, the lower mold core 6 flattens the multiple first curved surfaces 20 that it contacts, and the upper mold core 4 flattens the multiple second curved surfaces 30 that it contacts.

[0038] It is important to note that Figure 9 The diagrams shown are only intended to vividly illustrate the various process states of stamping the liquid-absorbing core onto the strip 10. The dimensional relationships between the aperture, height, and thickness of the first curved surface 20 and the second curved surface 30, as well as the liquid-absorbing core, do not represent the actual situation of the liquid-absorbing core.

[0039] Specifically, the liquid-absorbing core processed by the die stamping in this embodiment has both a first curved surface matrix and a second curved surface matrix. When applied to a heat dissipation device for two-phase flow heat exchange, the first puncture hole 201 on the first curved surface 20 and the second puncture hole 301 on the second curved surface 30 are closer to the liquid phase region, allowing the liquid phase to pass through, and the other is closer to the gas phase region, allowing the gas phase to pass through. Therefore, the liquid-absorbing core processed by the die stamping in this embodiment can isolate the flow of the liquid phase and the gas phase, reduce the "gas-liquid coupling resistance", and further improve the heat dissipation performance of the heat dissipation device for two-phase flow heat exchange in which the liquid-absorbing core is applied.

[0040] In this embodiment, a plurality of first stamping pillars 31 form a first stamping pillar matrix, and a plurality of second holes 32 form a second hole matrix. The rows of the first stamping pillar matrix and the second hole matrix are alternately arranged, and preferably, the columns are also alternately arranged. Similarly, a plurality of second stamping pillars 52 form a second stamping pillar matrix, and a plurality of first holes 51 form a first hole matrix. The rows of the second stamping pillar matrix and the first hole matrix are alternately arranged, and the columns are also alternately arranged.

[0041] The die core of the stamping and puncturing station has numerous holes and pillars. This ensures that the first stamping pillars 31 and the second holes 32 are arranged sufficiently closely, and that adjacent first stamping pillars 31 and second holes 32 are kept at a relatively large distance, reducing the machining difficulty of the die core. The die core can be made of tungsten steel, 51 steel, powder steel, etc. Furthermore, this ensures that the first curved surface 20 and the second curved surface 30 of the liquid-absorbing core are arranged sufficiently closely, and that adjacent first curved surfaces 20 and second curved surfaces 30 are kept at a relatively large distance, preventing tearing at the interface during stamping. Additionally, the first air-blowing hole 41 on the upper air-blowing and flattening die core 4 and the second air-blowing hole 61 on the lower air-blowing and flattening die core 6 of the air-blowing and flattening station are spatially staggered as much as possible to avoid interference between upper and lower airflow.

[0042] In this embodiment, the upper and lower airflows are spatially staggered to avoid mutual interference. To better avoid mutual interference between the upper and lower airflows, preferably, the first air blowing hole 41 blows air to the first curved surface 20 and the second air blowing hole 61 blows air to the second curved surface 30, which are carried out in stages.

[0043] Example 3: A liquid-absorbing core, which is manufactured by stamping based on the mold in Example 1. This liquid-absorbing core includes a plate (made by stamping and cutting strip 10) and a plurality of downwardly curved first surfaces 20 formed by stamping on the plate, which are arranged in a matrix and have first puncture holes 201 respectively. The lower ends of each first curved surface 20 are flush with each other and the waste generated by forming the first puncture holes 201 is turned outward.

[0044] The thickness of the strip 10 is relatively thin, ranging from millimeters to sub-millimeters. The material of the strip 10 can be stainless steel foil, copper foil, aluminum foil, etc. The diameter at the maximum outer diameter of the first curved surface 20 and the distance between adjacent first curved surfaces 20 can both be on the order of millimeters or sub-millimeters. The diameter of the first piercing hole 201 is very small.

[0045] Example 4: Figure 10As shown, a liquid-absorbing core is manufactured by die stamping based on the mold in Embodiment 2. This liquid-absorbing core includes a plate (made by stamping and cutting strip 10) and a plurality of downwardly curved first surfaces 20 formed by stamping on the plate, each having a first puncture hole 201, and a plurality of upwardly curved second surfaces 30 formed by stamping on the plate, each having a second puncture hole 301. The lower ends of each first surface 20 are flush with each other, and the upper ends of each second surface 30 are flush with each other. The waste generated by forming the first puncture hole 201 and the waste generated by forming the second puncture hole 301 are both turned outward.

[0046] The diameter of the second curved surface 30 at its maximum outer shape and the distance between adjacent first curved surfaces 20 can be the same as or different from the first curved surface 20. The shape and size of the second puncture hole 301 can be the same as or different from the first puncture hole 201.

[0047] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A liquid-absorbing core stamping die, comprising an upper template assembly (1) and a lower template assembly (2), characterized in that, It also includes a stamping piercing upper die core (3) and an air-blowing flattening upper die core (4) configured on the upper template assembly (1), and a stamping piercing lower die core (5) and an air-blowing flattening lower die core (6) configured on the lower template assembly (2); wherein, The upper stamping piercing die (3) is provided with a plurality of first stamping pillars (31) with piercing ends arranged in a matrix. The lower stamping piercing die (5) is provided with a first hole (51) corresponding to the first stamping pillar (31). Each first stamping pillar (31) is used to cooperate with the corresponding first hole (51) to stamp on the strip (10) during the mold closing process to form a first curved surface (20) with a first piercing hole (201). The upper mold core (4) is provided with a first air hole (41) corresponding to the first curved surface (20). The lower mold core (6) is in a plane position facing each first curved surface (20). During the mold closing process, the upper mold core (4) first blows air to the corresponding first curved surface (20) through its first air hole (41), and then the lower mold core (6) flattens multiple first curved surfaces (20).

2. The liquid-absorbing core stamping die according to claim 1, characterized in that, After the upper template component (1) and the lower template component (2) are closed in place, a preset interval is reserved between the air-blowing and flattening upper mold core (4) and the air-blowing and flattening lower mold core (6).

3. The liquid-absorbing core stamping die according to claim 1, characterized in that, The upper air chamber (4) of the blow-flattening mold core (4) is provided with an upper air chamber (42), and each first blow-out hole (41) is connected to the upper air chamber (42).

4. The liquid-absorbing core stamping die according to claim 1, characterized in that, The diameter of the first air hole (41) is smaller than the opening diameter of the first curved surface (20).

5. The liquid-absorbing core stamping die according to claim 1, characterized in that, The lower die core (5) for stamping and piercing is provided with a plurality of second stamping columns (52) with piercing ends arranged in a matrix. The second stamping columns (52) are staggered with the first holes (51). The upper die core (3) for stamping and piercing is provided with second holes (32) corresponding to the second stamping columns (52). Each second stamping column (52) is used to cooperate with the corresponding second hole (32) to stamp on the strip (10) during the mold closing process to form a second curved surface (30) with a second piercing hole (301). The blow-flattening lower mold core (6) is provided with a second blow-hole (61) corresponding to the second curved surface (30) one by one. The blow-flattening upper mold core (4) is in a plane position facing each second curved surface (30). During the mold closing process, the blow-flattening lower mold core (6) first blows air to the second curved surface (30) through its second blow-hole (61), and then the blow-flattening upper mold core (4) flattens multiple second curved surfaces (30).

6. The liquid-absorbing core stamping die according to claim 5, characterized in that, The lower air cavity (6) of the blow-flattening mold core (6) is provided with a lower air cavity (62), and each second blow-out hole (61) is connected to the lower air cavity (62).

7. A stamping method based on the liquid-absorbing core stamping die according to any one of claims 1-4, characterized in that, The methods include: During mold closing process: The stamping piercing upper die core (3) moves down with the upper template assembly (1), and each first stamping column (31) cooperates with the corresponding first hole (51) to stamp a downward curved first surface (20) on the strip (10), and uses its piercing end to pierce the center of the first curved surface (20) to form a first piercing hole (201). The upper mold core (4) is blown and flattened as the upper template assembly (1) moves down. Each first air blowing hole (41) blows air into the corresponding first curved surface (20), causing the waste material at the first puncture hole (201) to turn outward. Then the lower mold core (6) is blown and flattened to flatten the multiple first curved surfaces (20) that are in contact with it.

8. A stamping method based on the liquid-absorbing core stamping die according to claim 5 or 6, characterized in that, During mold closing process: As the upper die core (3) moves downward with the upper template assembly (1), each first stamping post (31) engages with the corresponding first hole (51) to stamp a downward curved first surface (20) on the strip (10), and uses its piercing end to pierce the center of the first curved surface (20) to form a first piercing hole (201); at the same time, each second stamping post (52) engages with the corresponding second hole (32) to stamp a upward curved second surface (30) on the strip (10), and uses its piercing end to pierce the center of the second curved surface (30) to form a second piercing hole (301). The upper mold core (4) is blown and flattened as the upper template assembly (1) moves down. Each first air blowing hole (41) blows air onto the corresponding first curved surface (20), causing the waste material at the first puncture hole (201) to turn outward. Each second air blowing hole (61) blows air onto the corresponding second curved surface (30), causing the waste material at the second puncture hole (301) to turn outward. Then, the lower mold core (6) is blown and flattened to flatten the multiple first curved surfaces (20) that contact it, and the upper mold core (4) is blown and flattened to flatten the multiple second curved surfaces (30) that contact it.

9. The stamping method according to claim 8, characterized in that, The first air hole (41) blows air to the corresponding first curved surface (20) and the second air hole (61) blows air to the corresponding second curved surface (30) in a time-separated manner.

10. A liquid-absorbing core, characterized in that, It is stamped using the stamping process described in any one of claims 7-9.

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