Bent gluing-free fin and production process thereof

Abstract

The invention discloses a bending gluing-free fin and a production process thereof, the bending gluing-free fin at least comprises two bridge pieces which are adjacently connected, and the joint of the two bridge pieces is a bending area; a self-locking structure is arranged at the position, located on the inner side of the bending direction, of the bending area, the self-locking structure comprises a connecting piece arranged on at least one bridge piece, and the connecting piece is buckled with the adjacent bridge piece to achieve self-locking fixing of the two bridge pieces; or connecting pieces are arranged on the two adjacent bridge pieces, and the connecting pieces of the adjacent bridge pieces are buckled with each other so as to achieve self-locking and fixing of the two bridge pieces. When the shape of the bending notch is designed, the fitting degree of the coincident position of every two fins after bending is fully considered, the self-locking structure of the coincident position is designed to achieve structural self-locking after the fins are bent, the gluing process of the coincident position of the fins is omitted, and the pain points that the coincident position of the fins is prone to water accumulation and frosting, wind resistance is increased, and the heat exchange efficiency is affected are avoided.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation fin technology, specifically to a bending glue-free fin and its manufacturing process. Background Technology

[0002] Existing multi-fold heat exchangers used in air conditioners are generally composed of multiple independent sub-heat exchangers connected together. Each sub-heat exchanger is molded separately, and the end plates of multiple sub-heat exchangers are connected together with a connecting plate by screws to form a multi-fold heat exchanger. The fins of this type of heat exchanger are generally bent fins. That is, bent sections are cut into a single fin, and then bent to form the shape of a multi-fold heat exchanger. The published Chinese invention patent CN116026180A discloses this type of fin structure.

[0003] After bending, the normal process requires applying glue to the bending point to fill the gap between the two fins. However, the glue application process has a drawback: water and frost easily accumulate at the glued area, resulting in poor ventilation, increased air resistance, and reduced heat exchange efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a bending adhesive-free fin and its manufacturing process to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bending fin that does not require glue, comprising at least two adjacent bridge pieces, wherein the connection between the two bridge pieces is a bending area; The bending area is provided with a self-locking structure on the inner side of the bending direction. The self-locking structure includes a connecting piece provided on at least one bridge piece. The connecting piece is engaged with the adjacent bridge piece to achieve self-locking fixation of the two bridge pieces. Alternatively, connecting pieces can be provided on both adjacent bridge pieces, and the connecting pieces of adjacent bridge pieces can be interlocked to achieve self-locking fixation of the two bridge pieces.

[0006] Preferably, the bending area is located on the inside of the bending direction, and the outlines of the two bridge pieces are both arc-shaped structures. When the two bridge pieces are fully bent, the adjacent positions of the two bridge pieces fit together through the arc-shaped structure. The connecting piece includes an inner card and an outer card set on the arc-shaped structure of one of the bridge pieces. When the two bridge pieces are fully bent, the inner card is pressed against the front edge of the other bridge piece, and the outer card is pressed against the back edge of the other bridge piece.

[0007] Preferably, the self-locking structure is provided with louvers around its perimeter, and the louvers are arranged along the contour of the arc-shaped structure.

[0008] Preferably, the connecting piece includes a first support piece disposed on one of the bridge pieces and a second support piece disposed on the other bridge piece. When the two bridge pieces are fully bent, the first support piece and the second support piece intersect each other to form a grid structure, and the end of the first support piece is pressed against the back of the adjacent bridge piece, and the end of the second support piece is pressed against the front of the other bridge piece.

[0009] Preferably, the bending area is provided with a transition plate, which is located between two adjacent bridge pieces, and both bridge pieces can be bent around the transition plate; The connecting piece includes a first support piece disposed on one of the bridge pieces, a second support piece disposed on the other bridge piece, and a third support piece disposed on the transition plate. When the two bridge pieces are fully bent, the first support piece, the second support piece, and the third support piece interlock to form a grid structure.

[0010] Preferably, the self-locking structure is provided with rotor protrusions that rise towards the front of the bridge piece around its periphery. The rotor protrusions are provided in two sets that are staggered with each other, and each set of rotor protrusions is distributed in a ring array along the bending area.

[0011] Preferably, the bending area is provided with irregular cuts and bending partition cuts on the outer side of the bending direction; The bridge plate has heat insulation cuts and through holes on its surface. The heat insulation cuts are distributed horizontally at intervals, and the through holes have two different hole diameter specifications, which are respectively set on different bridge plates.

[0012] The present invention also proposes a manufacturing process, including an drawing step, for pre-packing bosses at the location of through holes; Add recessed areas to the upper die of the drawing station, reduce the area of ​​the pressure ring of the upper die of the drawing station, and add a preload spring to the lower die.

[0013] Preferably, all heat insulation cutting positions are directly formed in one workstation.

[0014] Preferably, the process also includes a bending and partitioning step and a cross-cutting step, which are integrated into one station and located after the feeding station.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention fully considers the fit of the overlapping parts of the two fins after bending when designing the bending cut shape, and designs a self-locking structure at the overlapping part to achieve self-locking of the structure after bending the fins. This eliminates the glue application process at the overlapping part of the fins and avoids the pain point that water and frost easily accumulate at the overlapping part of the fins, which increases wind resistance and affects heat exchange efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the fins of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the state after bending; Figure 4 This is a schematic diagram of the second self-locking structure proposed in this invention; Figure 5 This is a schematic diagram of the third self-locking structure proposed in this invention; Figure 6 This is a schematic diagram of the drawing station structure of the present invention; Figure 7 This is a schematic diagram of the adjustable height structure of the drawing punch in the drawing station of the present invention; Figure 8 This is a schematic diagram showing the distribution of the upper die pressing ring in a traditional drawing station; Figure 9 This is a schematic diagram showing the distribution of the upper die pressing ring in the drawing station of the present invention; Figure 10 This is a schematic diagram of a traditional heat-insulated cutting station structure; Figure 11 This is a schematic diagram of the heat-insulating cutting station structure of the present invention; Figure 12 This is a side view of the heat insulation cutting station of the present invention; Figure 13 This is a schematic diagram of the lower mold of the heat-insulating cutting station of the present invention; Figure 14 This is a schematic diagram of the bending partition + cross-cutting station structure of the present invention; Figure 15 This is a schematic diagram of the lower mold for the bending partition and cross-cutting station of the present invention; Figure 16 For the present invention Figure 14 Side view; Figure 17 This is a schematic diagram of the upper mold of the bending partition + cross-cutting station of the present invention; Figure 18 This is a schematic diagram of the workstation layout for producing fins using a progressive die in this invention. Figure 1 ; Figure 19 This is a schematic diagram of the workstation layout for producing fins using a progressive die in this invention. Figure 2 .

[0017] In the diagram, 1. First bridge piece; 2. Second bridge piece; 21. Inner card; 22. Outer card; 23. First support piece; 24. Second support piece; 25. Third support piece; 3. Third bridge piece; 4. Irregular cut; 5. Bending partition cut; 51. Transition plate; 6. Thermal insulation cut; 7. Venetian blind; 100. Upper drawing template; 101. Upper backing plate; 102. Concave template; 103. Stripper plate; 104. Pressure plate; 105. Punch fixing plate; 106. Lower drawing template; 107. Upper pressure spring; 108. Upper pressure rod; 109. Drawing punch; 110. Spring pressure block; 111. Preload spring; 112. Upper wedge block; 113. Lower wedge block; 114. Pressure ring; 115. Recess; 200. Upper longitudinal cutting template; 201. Upper longitudinal cutting pad; 202. Upper sub-template; 203. Upper longitudinal cutting pad; 204. Upper blade fixing plate; 205. Longitudinal cutting unloading plate; 206. Lower sub-template; 207. Lower longitudinal cutting template; 208. Heat-insulating upper blade; 209. Pressure strip; 210. Side pressure plate; 211. Heat-insulating lower blade; 212. Lower blade fixing plate; 213. Lower pad; 300. Striking rod; 301. Striking block; 302. Cylinder; 303. Upper cross-cut template; 304. Upper cross-cutting blade; 305. Lower cross-cutting blade; 306. Lower cross-cutting template; 307. Lower cross-cutting template; 308. Upper cross-cutting blade positioning block; 309. Upper bending partition blade; 310. Lower bending partition blade; 311. Sliding block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 A type of bendable fin that does not require glue, comprising at least two adjacent bridge fins, with the connection point between the two bridge fins being the bending area; like Figure 1 The fin proposed in this embodiment includes three bridge plates, namely the first bridge plate 1, the second bridge plate 2, and the third bridge plate 3.

[0020] The bending area is located on the outside of the bending direction and has an irregular cut 4 and a bending partition cut 5. The bridge plate surface has heat insulation slits and through holes. The heat insulation slits are horizontally spaced, and the through holes have two different diameter specifications, each located on a different bridge plate. (Refer to...) Figure 1 The through hole a has a diameter of 5.2 mm and is distributed on the first bridge plate 1 and the second bridge plate 2. The through hole b has a diameter of 7.3 mm and is distributed on the third bridge plate. Different through holes correspond to the installation of different heat pipes. There are also heat insulation cuts 6 distributed along the length of the bridge plate.

[0021] The bending area is provided with a self-locking structure on the inner side of the bending direction. The self-locking structure includes a connecting piece provided on at least one bridge piece. The connecting piece is engaged with the adjacent bridge piece to achieve self-locking fixation of the two bridge pieces. Reference Figure 2 As shown, the bending area is located on the inside of the bending direction. The outlines of the two bridge pieces are both arc-shaped structures. When the two bridge pieces are fully bent, the adjacent positions of the two bridge pieces fit together through the arc-shaped structure. The connecting piece includes an inner card 21 and an outer card 22 disposed on the arc-shaped structure of one of the bridge pieces. When the two bridge pieces are fully bent, the inner card 21 is pressed against the front edge of the other bridge piece, and the outer card 22 is pressed against the back edge of the other bridge piece.

[0022] The inner card 21 and outer card 22 are positioned on the contour edge of the arc-shaped structure, ensuring that the contact area with the bridge plate is increased while minimizing the width. This minimizes the overlapping area in the width direction, preventing localized widening from causing greater heat transfer issues. Additionally, it ensures connection stability to a certain extent, preventing detachment during use and potential noise generation.

[0023] from Figure 2 As can be seen above, the inner card 21 and the outer card 22 are not integral; that is, they are disconnected in the middle. This improves the stability of the connection between the two structures. If they were made as a single unit, gaps would appear during use due to springback force, resulting in frictional noise. In the production process, the inner card 21 can be bent slightly towards the front side, and the outer card 22 can be bent slightly towards the back side to facilitate proper clamping. After bending, the inner card 21, the outer card 22, and the bridge plate form a mutually supporting structure on both sides, relying on the elasticity of the metal itself to achieve a stable connection.

[0024] use Figure 2 While the structure offers higher connection stability, overlapping areas still exist. The design of the inner and outer cards within the arc-shaped contour minimizes this overlap. If the overlap is too wide, a small gap will form between adjacent fins, leading to a "thermal short circuit" problem. This is especially problematic at the fin root, where the bending area significantly reduces heat dissipation. Therefore, this embodiment also includes louvers 7 around the bending area, arranged along the contour of the arc-shaped structure. The purpose of the louvers 7 is to further weaken the structure of the bending area, improve heat dissipation, and optimize the heat flow path.

[0025] Alternatively, connecting pieces can be provided on both adjacent bridge pieces, and the connecting pieces of adjacent bridge pieces can be interlocked to achieve self-locking fixation of the two bridge pieces.

[0026] like Figure 4The connecting piece includes a first support piece 23 disposed on one of the bridge pieces and a second support piece 24 disposed on the other bridge piece. When the two bridge pieces are fully bent, the first support piece 23 and the second support piece 24 intersect each other to form a grid structure, with the end of the first support piece 23 pressing against the back of the adjacent bridge piece and the end of the second support piece 24 pressing against the front of the other bridge piece. This design achieves stability through the interlocking support pieces, while the grid structure formed between the support pieces and the bridge pieces, similar to a window structure, mitigates the structural thickening caused by the overlap between the support pieces and the bridge piece supports.

[0027] like Figure 5 As shown, a transition plate 51 is provided in the bending area. The transition plate 51 is located between two adjacent bridge pieces, and both bridge pieces can be bent around the transition plate 51. The connecting piece includes a first support piece 23 disposed on one of the bridge pieces, a second support piece 24 disposed on the other bridge piece, and a third support piece 25 disposed on the transition plate 51. When the two bridge pieces are fully bent, the first support piece 23, the second support piece 24, and the third support piece 25 interlock to form a grid structure. Specifically, the first support piece 23 interlocks on top of the second support piece 24, the second support piece 24 interlocks on the third support piece 25, and the third support piece 25 interlocks on the first support piece 23.

[0028] This design and Figure 4 The structural difference lies in the elimination of the overlap between the support plate and the bridge plate body. The connection is completed by forming an inter-support structure through three support plates, while the grid structure weakens the overlap between the support plates.

[0029] Figure 4 and Figure 5 The structure of this type of structure differs significantly from planar structures in terms of heat transfer because the overlapping areas form a weakened mesh structure, and these overlapping areas are differentiated, with each part having a relatively small area. However, due to the sheet-like support structure, vibrations may occur under high wind speeds, resulting in noise. Therefore, in... Figure 4 and Figure 5 In terms of design, this embodiment has rotor protrusions 71 raised towards the front of the bridge piece around it. The rotor protrusions 71 are arranged in two sets that are interlaced with each other, and each set of rotor protrusions 71 is distributed in a ring array along the bending area.

[0030] Reference Figure 4 and Figure 5 As shown, the rotor protrusion 71 is similar to a swirl-cutting structure. When the wind flow passes through this area, it will be guided into an external swirling flow, which will not directly impact the support plate. In addition, it can accelerate the flow field here to improve heat dissipation in the overlapping area.

[0031] The rotor protrusion 71 can be manufactured by stamping.

[0032] This embodiment also makes the following improvements to the fin manufacturing process: Reference Figure 18 as well as Figure 19 As shown, this embodiment uses a progressive die to produce the fin. The overall process includes a multi-step drawing station, a punching and one-time flanging station, a thinning station, a bridge plate + louver / rotor protrusion station, a heat insulation cutting station, an irregular shape cutting station, a guiding station, a feeding station, and a bending partition + cross-cutting station.

[0033] Compared to traditional production processes, this embodiment has made improvements in the following three areas.

[0034] Because the fins in this embodiment have two aperture sizes, φ7.3mm and φ5.2mm, and the spacing between the apertures differs for each size—smaller for φ5.2mm and larger for φ7.3mm—the φ7.3mm apertures are more prone to entanglement wrinkles. A normal solution would be to use pre-packing bosses, but since this fin is a flat sheet forming a bridge-like structure, adding pre-packing bosses before forming the bridge would affect the fin's aesthetics. Therefore, this embodiment employs a 0.3mm deep anti-entanglement wrinkle recess in the upper die to reduce the effective area of ​​the drawing and packing pressure ring. Simultaneously, a pre-compression spring force is added to the lower die. These measures effectively solve the entanglement wrinkle problem. Furthermore, the difference in aperture size leads to a difference in the starting height. Therefore, the height of the φ7.3mm drawing punch is designed to be adjustable to adapt to the drawing height of both aperture sizes.

[0035] For specific mold structure reference Figures 6-9 As shown. It includes an upper template 100, an upper pad 101 installed at the bottom of the upper template 100, a concave template 102, a discharge plate 103 and a pressure plate 104 installed at the bottom of the upper pad 101, and an upper pressure spring 107 and an upper pressure rod 108 installed on the upper template 100.

[0036] It also includes a lower drawing template 106, on which a punch fixing plate 105 and a drawing punch 109 are mounted. Two preload springs 111 are also mounted on the lower drawing template 106, and spring pressure blocks 110 are connected to the top of the preload springs 111.

[0037] Reference Figure 8 as well as Figure 9 As shown, the traditional structure of the pressure ring 114 is as follows Figure 8 As shown, the dimensions are too large; the horizontal and vertical dimensions are approximately 14mm, and the diagonal dimensions are approximately 4.4mm. (Refer to...) Figure 9As shown, in this embodiment, a recess 115 is added at the original position of the pressure ring 114. This can be seen as partially hollowing out the pressure ring 114 upwards, reducing the area of ​​the pressure ring pressing the material, thereby improving the problem of pulling and wrinkling. In addition, the preload spring 111 is used to provide preload force for pressing the material and prevent the sheet material from shifting.

[0038] Additionally, regarding the adjustable height structure of the drawing punch, please refer to... Figure 7 As shown, it includes an adjusting screw 116 disposed on the lower template 106. The adjusting screw 116 is arranged horizontally, and one end of the adjusting screw 116 is connected to a lower wedge block 113. The upper part of the lower wedge block 113 is slidably connected to an upper wedge block 112 through an inclined surface. The upper part of the upper wedge block 112 is connected to a punch fixing plate 105. By feeding the adjusting screw 116, the lower wedge block 113 is pushed to slide, thereby using the inclined surface to drive the upper wedge block 112 to rise and fall, so as to achieve height adjustment.

[0039] The second improvement is that because the heat insulation cuts of the fins are densely distributed and the spacing is narrow, if designed according to the original longitudinal cutting structure, a staggered multi-station design is required to achieve this, which will lengthen the total length of the mold, affect the overall stability of the mold operation, and also increase the equipment cost. By using the innovative heat insulation cutting structure, all heat insulation cuts can be formed in one station, which shortens the total length of the mold and reduces the equipment cost.

[0040] Reference Figure 10 As shown, Figure 10 This is a traditional longitudinal cutting mechanism. As one of the longitudinal cutting units, it is staggered at multiple stations and completes all longitudinal cutting processes through multiple longitudinal cuts.

[0041] The structure of this embodiment is referenced. Figures 11-13 As shown, first look Figure 13 , Figure 13 As can be seen above, the longitudinal cutting station of this application integrates all the heat insulation cutting into one station, which can achieve one-time cutting.

[0042] The specific structure includes a longitudinal cutting upper template 200, a longitudinal cutting upper pad 201, an upper sub-template 202, and a longitudinal cutting upper pad 203, on which an upper blade fixing plate 204 is installed. It also includes a heat-insulating upper blade 208, which is directly embedded in the upper sub-template 202 by vertical bolts, and the blade head position is fixed by the upper blade fixing plate 204.

[0043] The lower mold includes a longitudinal cutting lower template 207, a lower sub-template 206, a longitudinal cutting unloading plate 205, a lower shim 213, and a lower blade fixing plate 212. It also includes a heat-insulating cutting blade 211, which is also directly embedded in the lower sub-template 206 by vertical bolts, and its position is fixed by the lower blade fixing plate 212.

[0044] In addition, the lower mold also includes a pressure bar 209 and a side pressure plate 210.

[0045] The upper and lower blade mounting structure in this embodiment also differs from the traditional structure. (Refer to...) Figure 10 As shown in the figure, in the traditional structure, both the upper blade 21 and the lower blade 22 are installed using upper and lower blade holders. As can be seen from the figure, the upper and lower blade holders are fixed to the upper and lower dies by lateral bolts. This structure results in excessive lateral space occupation, making it impossible to complete all heat-insulating cuts in one station as proposed in this embodiment. However, this application uses vertical bolts to directly embed the blades into the upper and lower dies, occupying virtually no space on the sides. Therefore, all longitudinal cutting blades can be integrated in one station.

[0046] Finally, in this embodiment, the fin distribution has two bending partitions. If the bending partitions are formed before the feeding station, it will reduce the strength of the fins and lead to unstable feeding. At the same time, adding a forming station will increase the total length of the mold, increasing equipment costs. Therefore, in this embodiment, the bending partitions and cross-cutting are formed as one piece, with the cross-cutting station after the feeding station. The bending partitions are formed after the feeding station, avoiding the problem of unstable feeding. At the same time, the number of forming stations is reduced, the total length of the mold is effectively controlled, the stability of mold operation is improved, and equipment costs are reduced.

[0047] For specific mold structure reference Figures 14 to 17 As shown. The upper mold includes a striking rod 300, a sliding block 311, a striking block 301, and a cylinder 302. In the conventional structure, the striking rod 300, striking block 301, sliding block 311, and cylinder 302 are designed for idle steps. In this embodiment, since the two steps are set at one station in continuous processing, idle steps are not required. However, idle steps are needed in the first processing step, so this structure is retained. Its function and principle are the same as the conventional structure, so they will not be described in detail.

[0048] It also includes a cross-cutting upper template 303, a cross-cutting upper blade 304, and a bending partition upper blade 309. The cross-cutting upper blade 304 is installed via a cross-cutting upper blade positioning block 308. The bending partition upper blade 309 is installed via a fixing block.

[0049] The lower mold includes a cross-cutting lower template 307, a cross-cutting lower sub-template 306, a cross-cutting lower blade 305, and a bending and partitioning lower blade 310.

[0050] Combination Figure 14 as well as Figure 17 As shown, two sets of cutting tools are arranged in the same upper and lower molds to achieve one-step forming of two cuts.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of bending fin that requires no glue application, characterized in that: It includes at least two adjacent bridge plates, with the connection point between the two bridge plates being a bending zone; The bending area is provided with a self-locking structure on the inner side of the bending direction. The self-locking structure includes a connecting piece provided on at least one bridge piece. The connecting piece is engaged with the adjacent bridge piece to achieve self-locking fixation of the two bridge pieces. Alternatively, connecting pieces can be provided on both adjacent bridge pieces, and the connecting pieces of adjacent bridge pieces can be interlocked to achieve self-locking fixation of the two bridge pieces.

2. The bending-resistant fin without adhesive as described in claim 1, characterized in that: The bending area is located on the inside of the bending direction. The outlines of the two bridge pieces are both arc-shaped structures. When the two bridge pieces are fully bent, the adjacent positions of the two bridge pieces fit together through the arc-shaped structure. The connecting piece includes an inner card (21) and an outer card (22) set on the arc-shaped structure of one of the bridge pieces. When the two bridge pieces are fully bent, the inner card (21) is pressed against the front edge of the other bridge piece, and the outer card (22) is pressed against the back edge of the other bridge piece.

3. The bending-resistant, glue-free fin according to claim 2, characterized in that: The self-locking structure is surrounded by louvers (7), which are arranged along the outline of the arc-shaped structure.

4. The bending-resistant, glue-free fin according to claim 1, characterized in that: The connecting piece includes a first support piece (23) disposed on one of the bridge pieces and a second support piece (24) disposed on the other bridge piece. When the two bridge pieces are fully bent, the first support piece (23) and the second support piece (24) intersect each other to form a grid structure, and the end of the first support piece (23) is pressed against the back of the adjacent bridge piece, and the end of the second support piece (24) is pressed against the front of the other bridge piece.

5. A bending fin without adhesive as described in claim 1, characterized in that: A transition plate (51) is provided in the bending area. The transition plate (51) is located between two adjacent bridge pieces, and both bridge pieces can be bent around the transition plate (51). The connecting piece includes a first support piece (23) disposed on one of the bridge pieces, a second support piece (24) disposed on the other bridge piece, and a third support piece (25) disposed on the transition plate (51). When the two bridge pieces are fully bent, the first support piece (23), the second support piece (24), and the third support piece (25) interlock to form a grid structure.

6. A bending fin without adhesive as described in claim 4 or 5, characterized in that: The self-locking structure is provided with rotor protrusions (71) that rise towards the front of the bridge piece. The rotor protrusions (71) are arranged in two sets that are staggered with each other. Each set of rotor protrusions (71) is distributed in a ring array along the bending area.

7. A bending fin without adhesive as described in claim 1, characterized in that: The bending area is located on the outside of the bending direction and has an irregular cut (4) and a bending partition cut (5). The bridge plate has heat insulation cuts and through holes on its surface. The heat insulation cuts are distributed horizontally at intervals, and the through holes have two different hole diameter specifications, which are respectively set on different bridge plates.

8. A manufacturing process for producing a bending, glue-free fin as described in any one of claims 1-7, characterized in that: Includes an extension step for pre-packing bosses at the location of through holes; Add recessed areas to the upper die of the drawing station, reduce the area of ​​the pressure ring of the upper die of the drawing station, and add a preload spring to the lower die.

9. A production process according to claim 8, characterized in that: All heat insulation cutting points are directly formed in one workstation.

10. A production process according to claim 9, characterized in that: It also includes a bending partition step and a cross-cutting step, which are integrated into one station and set after the feeding station.

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