Bent fin without glue and its production process

Abstract

The application discloses a bending glue-free fin and a production process thereof, and at least comprises two bridge pieces connected adjacently, and a bending area at the connection of the two bridge pieces; a self-locking structure is arranged at the inner side position of the bending area in the bending direction, the self-locking structure comprises a connecting piece arranged on at least one bridge piece, and the connecting piece and the adjacent bridge piece are mutually buckled to realize the self-locking fixation of the two bridge pieces; or, the connecting pieces are arranged on the two adjacent bridge pieces, and the connecting pieces of the adjacent bridge pieces are mutually buckled to realize the self-locking fixation of the two bridge pieces. In the design of the bending cut shape, the application fully considers the fitting degree of the two fins at the overlapping position after bending, and designs the self-locking structure at the overlapping position to realize the structure self-locking after the fin bending, cancels the glue process at the fin overlapping position, avoids the pain point that the water and frost are easily accumulated at the fin overlapping position, wind resistance is increased, and the heat exchange efficiency is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation fins, in particular to a bent glue-free fin and a production process thereof. BACKGROUND

[0002] The existing multi-fold heat exchanger used in air conditioners is generally composed of multiple independent sub-heat exchangers connected together. After each sub-heat exchanger is separately formed, the end plates of the multiple sub-heat exchangers are connected together by screws and connecting plates to form a multi-fold heat exchanger. The fins of this type of heat exchanger generally adopt bent fins. That is, a bent partition is cut on a single fin, and then the bent fins are formed into the shape of a multi-fold heat exchanger. The Chinese invention patent CN116026180A has disclosed such a fin structure.

[0003] The normal process of bending requires glue to fill the gap between the two bent fins, but the glue process has a defect that the glued part is prone to water accumulation and frost, resulting in poor air exhaust, increased air resistance, and affecting the heat exchange efficiency. SUMMARY

[0004] The purpose of the present application is to provide a bent glue-free fin and a production process thereof to solve the problems raised in the background art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a bent glue-free fin, at least including two adjacent bridge pieces, the connection part of the two bridge pieces being a bending area;

[0006] The self-locking structure is provided at the inner side of the bending direction of the bending area, and the self-locking structure includes a connecting piece provided on at least one bridge piece, the connecting piece and the adjacent bridge piece being mutually buckled to realize the self-locking fixation of the two bridge pieces.

[0007] Alternatively, the connecting piece is provided on each of the two adjacent bridge pieces, and the connecting pieces of the adjacent bridge pieces are mutually buckled to realize the self-locking fixation of the two bridge pieces.

[0008] Preferably, the bending area is located at the inner side of the bending direction, and the profiles of the two bridge pieces are arc-shaped structures, and when the two bridge pieces are fully bent, the adjacent positions of the two bridge pieces are mutually adhered through the arc-shaped structures.

[0009] The connecting piece includes an inner card and an outer card provided on the arc-shaped structure of one of the bridge pieces, and when the two bridge pieces are fully bent, the inner card is buckled at the front edge position of the other bridge piece, and the outer card is buckled at the back edge position of the other bridge piece.

[0010] Preferably, the periphery of the self-locking structure is provided with a louver, and the louver is arranged along the profile of the arc-shaped structure.

[0011] Preferably, the connecting piece comprises a first support piece arranged on one of the bridge pieces and a second support piece arranged on the other bridge piece, the first support piece and the second support piece cross each other to form a grid structure when the two bridge pieces are fully bent, and the end of the first support piece is buckled on the reverse side of the adjacent bridge piece, and the end of the second support piece is buckled on the front side of the other bridge piece.

[0012] Preferably, the bending area is provided with a transition plate located between two adjacent bridge pieces, and the two bridge pieces can be bent around the transition plate.

[0013] The connecting piece comprises a first support piece arranged on one of the bridge pieces, a second support piece arranged on the other bridge piece, and a third support piece arranged on the transition plate, the first support piece, the second support piece and the third support piece are buckled with each other to form a grid structure when the two bridge pieces are fully bent.

[0014] Preferably, the periphery of the self-locking structure is provided with rotor bumps protruding towards the front side of the bridge piece, the rotor bumps are arranged in two groups staggered with each other, and each group of rotor bumps is arranged in a ring array along the bending area.

[0015] Preferably, the bending area located on the outer side of the bending direction is provided with a special-shaped cutout and a bending partition cutout.

[0016] The surface of the bridge piece is provided with a heat insulation cutout and a through hole, the heat insulation cutouts are horizontally and interval distributed, and the through holes have two different aperture specifications and are arranged on different bridge pieces.

[0017] The application also proposes a production method process, comprising a stretching step for pre-packaging a boss at the position of the through hole;

[0018] A pit is added to the upper die of the stretching station, the area of the edge ring of the upper die of the stretching station is reduced, and a pre-pressing spring is added to the lower die.

[0019] Preferably, all the heat insulation cutouts are directly formed in one station.

[0020] Preferably, the application further comprises a bending partition step and a cross-cutting step, the bending partition step and the cross-cutting step are integrated in one station, and the station is arranged after the feeding station.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] In the design of the bending cutout shape, the application fully considers the fit degree of the overlapping positions of the two wings after bending, and designs a self-locking structure at the overlapping position to realize the self-locking of the structure after the wings are bent, cancels the gluing process at the overlapping position of the wings, and avoids the pain point that water and frost are easily accumulated at the overlapping position of the wings, causing increased wind resistance and affecting the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The overall structure of the fin of the present application is shown in the figure;

[0024] Figure 2 The overall structure of the fin of the present application is shown in the figure; Figure 1 The enlarged view of A in the figure;

[0025] Figure 3 The overall structure of the fin of the present application is shown in the figure;

[0026] Figure 4 The second self-locking structure of the present application is shown in the figure;

[0027] Figure 5 The third self-locking structure of the present application is shown in the figure;

[0028] Figure 6 The drawing position structure of the present application is shown in the figure;

[0029] Figure 7 The drawing position structure of the present application is shown in the figure;

[0030] Figure 8 The drawing position structure of the present application is shown in the figure;

[0031] Figure 9 The drawing position structure of the present application is shown in the figure;

[0032] Figure 10 The traditional heat insulation cutting position structure is shown in the figure;

[0033] Figure 11 The heat insulation cutting position structure of the present application is shown in the figure;

[0034] Figure 12 The heat insulation cutting position structure of the present application is shown in the figure;

[0035] Figure 13 The heat insulation cutting position structure of the present application is shown in the figure;

[0036] Figure 14 The bending and cutting position structure of the present application is shown in the figure;

[0037] Figure 15 The bending and cutting position structure of the present application is shown in the figure;

[0038] Figure 16 The bending and cutting position structure of the present application is shown in the figure; Figure 14 The bending and cutting position structure of the present application is shown in the figure;

[0039] Figure 17 The bending and cutting position structure of the present application is shown in the figure;

[0040] Figure 18The work station layout diagram for producing the fin by using the progressive die of the present application Figure 1 ;

[0041] Figure 19 The work station layout diagram for producing the fin by using the progressive die of the present application Figure 2 .

[0042] In the figure, 1, first bridge; 2 second bridge; 21, inner card; 22. outer card 23, first support piece; 24, second support piece; 25, third support piece; 3, third bridge; 4, special-shaped cutout; 5, bending partition cutout; 51, transition plate; 6, heat insulation cutout; 7, louver;

[0043] 100, drawing upper die plate; 101, upper backing plate; 102, concave die plate; 103, stripper plate; 104, pressing plate; 105, protruding die fixing plate; 106, drawing lower die plate; 107, upper pressing spring; 108, upper pressing rod; 109, drawing protruding die; 110, spring pressing block; 111, pre-pressing spring; 112, upper wedge block; 113, lower wedge block; 114, edge ring; 115, concave pit;

[0044] 200, longitudinal cutting upper die plate; 201 longitudinal cutting upper backing plate; 202, upper sub-die plate; 203, longitudinal cutting upper backing plate; 204, upper knife fixing plate; 205, longitudinal cutting stripper plate; 206, lower sub-die plate; 207, longitudinal cutting lower die plate; 208, heat insulation cutting upper knife; 209, material pressing strip; 210, side pressing plate; 211, heat insulation cutting lower knife; 212, lower knife fixing plate; 213, lower backing plate;

[0045] 300, rod hitting; 301, hitting block; 302, air cylinder; 303, transverse cutting upper sub-die plate; 304, transverse cutting upper knife; 305, transverse cutting lower knife; 306, transverse cutting lower sub-die plate; 307, transverse cutting lower die plate; 308, transverse cutting upper knife positioning block; 309, bending partition upper knife; 310, bending partition lower knife; 311, sliding block. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0047] Please refer to Figure 1 A bending glue-free fin, which comprises two adjacent connected bridge pieces, and the connection of the two bridge pieces is a bending area.

[0048] As Figure 1The 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.

[0049] The bending area is located on the outside of the bending direction and has an irregular cut 4 and a bending partition cut 5.

[0050] 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 2 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.

[0051] There are also heat insulation cuts 6 distributed along the length of the bridge plate.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The structure of the present embodiment is adopted Figure 4 The connection stability is higher, but there is still an overlapping area. The width of the overlapping area can be avoided as much as possible through the design of the arc-shaped profile of the inner and outer cards. If the width of the overlapping area is too wide, a local small spacing area will be formed between the adjacent fins, and the "thermal short circuit" problem will occur. Especially when the bending area is located at the root of the fin, the heat dissipation effect will be obviously reduced. Therefore, the present embodiment further provides a louver 7 around the bending area, and the louver 7 is arranged along the profile of the arc-shaped structure. The purpose of the louver 7 is to further weaken the structure of the bending area, improve the heat dissipation effect, and optimize the heat flow path.

[0058] Alternatively, the connecting piece is arranged on each of the two adjacent bridge pieces, and the connecting pieces of the adjacent bridge pieces are buckled to each other to realize self-locking fixation of the two bridge pieces.

[0059] As shown in Figure 5 The connecting piece includes a first support piece 23 arranged on one of the bridge pieces and a second support piece 24 arranged on the other bridge piece. When the two bridge pieces are fully bent, the first support piece 23 and the second support piece 24 cross each other to form a grid structure, and the end of the first support piece 23 is buckled on the reverse side of the adjacent bridge piece, and the end of the second support piece 24 is buckled on the front side of the other bridge piece. The design at this position is to stabilize the connection through the cross mutual support of the support pieces, and a grid structure is formed between the support pieces and the bridge pieces, that is, a structure similar to a window, to weaken the thickened structure caused by the overlapping of the support pieces and the bridge pieces.

[0060] As shown in Figure 4 The bending area is provided with a transition plate 51, and the transition plate 51 is located between the two adjacent bridge pieces, and the two bridge pieces can be bent around the transition plate 51.

[0061] The connecting piece includes a first support piece 23 arranged on one of the bridge pieces, a second support piece 24 arranged on the other bridge piece, and a third support piece 25 arranged 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 are buckled to each other to form a grid structure. Specifically, the first support piece 23 is buckled above the second support piece 24, the second support piece 24 is buckled on the third support piece 25, and the third support piece 25 is buckled on the first support piece 23.

[0062] The difference between this design and the structure of Figure 4 The overlapping of the support piece and the bridge piece body is cancelled, the mutual support structure is formed by the three support pieces to complete the connection, and the grid structure is formed to weaken the overlapping between the support pieces.

[0063] Figure 5 and Figure 4The 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 5 and Figure 4 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.

[0064] Reference Figure 5 and Figure 18 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.

[0065] The rotor protrusion 71 can be manufactured by stamping.

[0066] This embodiment also makes the following improvements to the fin manufacturing process:

[0067] Reference Figure 19 as well as Figures 6-9 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.

[0068] Compared to traditional production processes, this embodiment has made improvements in the following three areas.

[0069] 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.

[0070] For specific mold structure referenceFigure 8 As shown in the figure. Including the extension of the upper die plate 100, the bottom of the extension of the upper die plate 100 is installed with the upper pad plate 101, the bottom of the upper pad plate 101 is installed with the concave die plate 102, the stripper plate 103 and the pressing plate 104, the extension of the upper die plate 100 is also installed with the upper pressing spring 107 and the upper pressing rod 108.

[0071] Also includes the extension of the lower die plate 106, the extension of the lower die plate 106 is installed with the convex die fixed plate 105 and the extension of the convex die 109. The extension of the lower die plate 106 is also installed with two pre-pressing springs 111, and the top of the pre-pressing spring 111 is connected with the spring pressing block 110.

[0072] Referring to Figure 9 And Figure 8 As shown in the figure, the traditional structure of the blank holder 114 is as shown in the figure Figure 9 The size is too large, the longitudinal and transverse size is about 14mm, and the oblique size is about 4.4. Referring to Figure 7 As shown in the figure, in this embodiment, a pit 115 is added at the position of the original blank holder 114, which can be regarded as partially hollowing out the blank holder 114 upward to reduce the area of the blank holder to improve the problem of pulling wrinkles. In addition, the pre-pressing spring 111 is used to provide pre-tightening force to avoid displacement of the plate.

[0073] In addition, referring to Figure 10 As shown in the figure, it includes an adjusting screw 116 arranged on the extension of the lower die plate 106, the adjusting screw 116 is arranged transversely, one end of the adjusting screw 116 is connected with the lower wedge block 113, the upper part of the lower wedge block 113 is connected with the upper wedge block 112 through the inclined surface sliding connection, and the upper part of the upper wedge block 112 is connected with the convex die fixed plate 105. The lower wedge block 113 is pushed to slide by the feeding of the adjusting screw 116, so as to drive the upper wedge block 112 to rise and fall by the inclined surface, so as to realize the height adjustment.

[0074] The second improvement: because the fin heat insulation cut distribution is dense and the spacing is narrow, if designed according to the original longitudinal cutting structure, it needs to be designed with multiple positions to realize it, so that the total length of the mold will be lengthened, which affects the stability of the overall operation of the mold, and also increases the equipment cost; use the innovative heat insulation cutting structure to realize all the heat insulation cutting in one station, the total length of the mold is shortened, and the equipment cost is reduced.

[0075] Referring to Figure 10 As shown in the figure, Figures 11-13 It is a traditional longitudinal cutting mechanism, which is one of the longitudinal cutting units, staggered with multiple stations, and multiple longitudinal cutting is completed to complete all the longitudinal cutting processes.

[0076] The structure of this embodiment is shown in the figure Figure 13 As shown in the figure, first look at Figure 13 , Figure 10As can be seen, the longitudinal cutting station of the present application integrates all the heat insulation cutting in one station, which can be cut out at one time.

[0077] The specific structure includes a longitudinal cutting upper die plate 200, a longitudinal cutting upper gasket 201, an upper sub-die plate 202, and a longitudinal cutting upper gasket 203, and the upper knife fixing plate 204 is installed on the longitudinal cutting upper gasket 203. It also includes a heat insulation cutting upper knife 208, which is directly embedded and installed in the upper sub-die plate 202 through vertical bolts, and the position of the knife head is fixed by the upper knife fixing plate 204.

[0078] The lower die includes a longitudinal cutting lower die plate 207, a lower sub-die plate 206, a longitudinal cutting unloading plate 205, a lower gasket 213, and a lower knife fixing plate 212. It also includes a heat insulation cutting lower knife 211, which is also directly embedded and installed in the lower sub-die plate 206 through vertical bolts, and the position is fixed by the lower knife fixing plate 212.

[0079] In addition, the lower die also includes a pressing strip 209 and a side pressing plate 210.

[0080] The upper and lower knife mounting structure of the present embodiment is also different from the traditional structure. Referring to Figures 14 to 17 As shown in the figure, the upper knife 21 and the lower knife 22 in the traditional structure are installed in the form of upper and lower knife seats. As can be seen from the figure, the upper and lower knife seats are fixed on the upper and lower dies through lateral bolts. This structure will cause the lateral space to be too large. It is impossible to realize all the heat insulation cutting in one station as proposed in the present embodiment. The present application uses vertical bolts to directly embed the knife in the upper and lower dies, and the side basically does not occupy space, so all the longitudinal cutting knives can be integrated in one station.

[0081] Finally, the fin distribution of the present embodiment has two bending partitions. If the bending partition is formed before the feeding station, it will reduce the strength of the fin and cause unstable feeding. At the same time, increasing the forming station will cause the total length of the mold to be lengthened, increasing the equipment cost. Therefore, the bending partition and the cross-cutting are integrally formed in the present embodiment, the cross-cutting station is after the feeding station, and the bending partition is formed after the feeding station, which avoids the problem of unstable feeding. At the same time, the forming station is reduced, the total length of the mold is effectively controlled, the stability of the mold operation is improved, and the equipment cost is reduced.

[0082] The specific mold structure is shown in Figure 14 The upper die includes a punch 300, a sliding block 311, a striking block 301, and a cylinder 302. The punch 300, the striking block 301, the sliding block 311, and the cylinder 302 in the traditional structure are designed for empty steps. In the continuous processing of the present embodiment, two steps are arranged in one station, so there is no need for empty steps, but empty steps are needed in the first processing, so the structure is retained. Its function and principle are the same as the traditional structure, so it will not be described again.

[0083] 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.

[0084] 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.

[0085] Combination Figure 17 as well as ​ As shown, two sets of cutting tools are arranged in the same upper and lower molds to achieve one-step forming of two cuts.

[0086] 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: At least two adjacent connected bridges, the connection of the two bridges is a bending area; A self-locking structure is arranged at the inner side of the bending area, the self-locking structure includes a connecting piece arranged on at least one bridge, the connecting piece and the adjacent bridge are buckled to each other to realize the self-locking of the two bridges; The bending area is located at the inner side of the bending direction, and the profiles of the two bridges are arc structures, when the two bridges are fully bent, the adjacent positions of the two bridges are matched with each other through the arc structures; The connecting piece includes an inner card (21) and an outer card (22) arranged on the arc structure of one of the bridges, when the two bridges are fully bent, the inner card (21) is buckled on the front edge position of the other bridge, and the outer card (22) is buckled on the back edge position of the other bridge; Alternatively, the connecting piece is arranged on each of the two adjacent bridges, and the connecting pieces of the adjacent bridges are buckled to each other to realize the self-locking of the two bridges; The connecting piece includes a first supporting piece (23) arranged on one of the bridges and a second supporting piece (24) arranged on the other bridge, when the two bridges are fully bent, the first supporting piece (23) and the second supporting piece (24) are crossed with each other to form a grid structure, and the end of the first supporting piece (23) is buckled on the back of the adjacent bridge, and the end of the second supporting piece (24) is buckled on the front of the other bridge; Alternatively, the bending area is provided with a transition plate (51), the transition plate (51) is located between the two adjacent bridges, and the two bridges can be bent around the transition plate (51); The connecting piece includes a first supporting piece (23) arranged on one of the bridges, a second supporting piece (24) arranged on the other bridge, and a third supporting piece (25) arranged on the transition plate (51), when the two bridges are fully bent, the first supporting piece (23), the second supporting piece (24) and the third supporting piece (25) are buckled to each other to form a grid structure.

2. The bent fin of claim 1, wherein: The periphery of the self-locking structure is provided with a louver (7) arranged along the profile of the arc structure.

3. The bending glue-free fin according to claim 1, characterized in that: The periphery of the self-locking structure is provided with a rotor bump (71) protruding towards the front of the bridge, the rotor bump (71) is provided with two groups of interlaced rotor bumps (71), and each group of rotor bumps (71) is arranged in a ring shape along the bending area.

4. The bending glue-free fin according to claim 1, characterized in that: The outer side of the bending area is provided with a special-shaped cutout (4) and a bending partition cutout (5); The surface of the bridge is provided with a heat insulation cutout and a through hole, the heat insulation cutout is horizontally and spacedly distributed, and the through hole has two different aperture specifications and is arranged on different bridges.

5. A production process for producing the bent and glue-free fin according to any one of claims 1 to 4, characterized in that: It includes an extension step for pre-packaging a boss at the position of the through hole; A pit is added to the upper die of the extension station to reduce the area of the edge ring of the upper die of the extension station, and a pre-pressing spring is added to the lower die.

6. A production process according to claim 5, characterized in that: All the heat insulation cutouts are directly formed in one station.

7. A production process according to claim 6, characterized in that: It also includes a bending partitioning step and a cross-cutting step, the bending partitioning step and the cross-cutting step are integrated in one station, and the station is arranged after the feeding station.

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