Radiator fin and machining process and stretching die thereof

Abstract

The invention discloses a radiator fin and a machining process and a drawing die thereof, and relates to the technical field of radiators, the radiator fin comprises a fin body and a tube hole punched in the fin body, an embossed protrusion is arranged at the transition connection position of the near end of the tube hole and the fin body, and a spiral grain protrusion is arranged at the far end of the tube hole. Convex indentation lines are arranged on the peripheral wall of the pipe hole and extend in the axial direction of the pipe hole. On the fin structure, the embossing protrusions and the spiral grain protrusions are arranged, fin self-locking can be achieved in the pipe sleeving stage, mutual fixing of the positions of the fins is kept, and deviation in the subsequent machining and conveying process is prevented; besides, the embossed protrusions and the spiral grain protrusions are located at the two ends of the pipe hole respectively, deformation caused by internal stress can be effectively absorbed at the two ends through the design of the protruding structures, certain elastic potential energy is given to the pipe hole in cooperation with the indentation grains arranged in the middle of the pipe hole, deformation caused by thermal expansion and cold contraction can be effectively avoided, and the fitting degree of the pipe and the copper pipe is improved.

Description

Technical Field

[0001] This application relates to the field of radiator technology, specifically to a radiator fin, its processing technology, and a stretching die. Background Technology

[0002] Finned radiators are a common type of radiator. The typical manufacturing process involves first producing the fins using a mold, and then inserting long U-shaped copper tubes inside the fins (see [reference]). Figure 3 (As shown), then the fins are expanded to ensure the fins are fixed to the copper tubes. Finally, small U-shaped copper tubes are welded to the ends to form a closed loop space. Finally, refrigerant is injected into the loop space.

[0003] In the existing process, the thinning and stretching of fins through a mold can lead to uneven thickness of the peripheral wall material of the tube hole, which affects the heat transfer efficiency and can also cause internal stress that can deform the tube hole, which is not conducive to subsequent processing and use. Therefore, improvements are needed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a radiator fin, its processing technology, and a stretching die.

[0005] A heat sink fin includes: It includes the fin body and the tube hole stamped on the fin body. The transition connection between the near end of the tube hole and the fin body is provided with embossed protrusions, and the far end of the tube hole is provided with spiral protrusions. The peripheral wall of the tube hole is provided with outwardly protruding embossed patterns, which extend along the axial direction of the tube hole.

[0006] In a radiator fin provided in this application, the spiral protrusion is provided with at least two mutually spaced toothed protrusion structures. The toothed protrusion structure is recessed in the middle, with one side being an arc-shaped transition rounded corner and the other side being a sharp corner, which is connected to the side of the spiral protrusion.

[0007] In a radiator fin provided in this application, the tube holes of the multi-layer fin body are superimposed on each other and connected in sequence through the tube holes to form a passage, forming a radiator body without copper tubes.

[0008] This application also proposes a processing technology for heat sink fins, which includes the following steps: first, punching tube holes on the fin body, then using a rotating and advancing punch head to stretch and thin the tube holes, and during the thinning process, using the punch head and die to extrude embossed protrusions, spiral protrusions and indentation patterns.

[0009] The heat sink fin processing technology provided in this application also includes a heat sink body processing step without copper tubes: First, the far end of the tube hole is pressed with a mold, and the far end of the tube hole after pressing is a narrowed structure. When the adjacent fin bodies are stacked, the far end of the tube hole of one fin body is inserted into the near end of the tube hole of another fin body. Before this step, the position of the tube hole to be welded is pre-coated with nickel-based brazing filler. After the butt joint is completed, the embossed protrusions and spiral protrusions of the adjacent tube holes match and snap together. Finally, the tube holes are placed in a welding furnace for welding and fixing.

[0010] This application also proposes a stretching die for radiator fins, used to process the aforementioned radiator fins, comprising the following structure: Upper mold and lower mold, wherein: The upper mold is fixedly installed with a concave mold sleeve, and a push rod is slidably installed in the inner cavity of the concave mold sleeve. The upper end of the push rod is connected to a return spring. The lower die is equipped with a punch head and a push head, as well as a drive column for pushing the punch head and the push head to move up and down; The punch head is configured with an expanding plug structure. When the ejector pin is inserted into the punch head, the outer wall of the punch head expands outward. The push head includes an output shaft, which is fixedly connected to the punch head. A cam shaft is fixedly connected to the bottom of the output shaft. A cam groove is opened on the outer circumferential surface of the cam shaft. A drive rod is sleeved on the cam shaft. A ball is installed on the inner side of the drive rod and is housed in the cam groove. A push rod is connected to the bottom of the drive rod. The push rod performs up and down extension and retraction movements. The drive rod drives the cam shaft to rotate, thereby driving the punch head to rotate.

[0011] In the stretching die for radiator fins provided in this application, the punch head includes an expansion block, an inner core, and a base. The expansion block has an L-shaped structure, and a radial groove is opened on the end face of the base. The bottom of the expansion block is slidably connected to the groove, and the inner sidewall of the expansion block is hinged to the inner core by two vertically arranged connecting rods.

[0012] In the stretching die for radiator fins provided in this application, the push head also includes a housing, the outer diameter of which is smaller than that of the punch head in the expanded state, a pressure roller is connected to the outside of the drive rod, and an axial through groove is provided on the housing to expose the pressure roller.

[0013] In the stretching die for radiator fins provided in this application, the output shaft of the push head is fixedly connected to a base plate, and the base of the punch head is fixedly connected to the base plate by surface-mounted bolts.

[0014] In a stretching die for radiator fins provided in this application, the bottom of the die sleeve is provided with a stepped structure, the stepped structure is transitioned by a rounded chamfer, the outer side of the stepped structure is provided with a forming surface for forming embossed protrusions, the inner peripheral wall of the die sleeve is provided with a forming surface along the axial direction to cooperate with the pressure roller to form an indentation pattern, and the upper inner peripheral wall of the die sleeve is also provided with a forming surface for forming a spiral protrusion.

[0015] In summary, this application has the following main beneficial effects: Firstly, the embossed and spiral raised features on the fin structure enable fin self-locking during the sleeve stage, maintaining the fin positions and preventing displacement during subsequent processing and conveying. Secondly, the embossed and spiral raised features are located at both ends of the tube hole. The raised structure at both ends effectively absorbs deformation caused by internal stress. In addition, the embossed texture in the middle of the tube hole imparts a certain elastic potential energy to the tube hole, effectively preventing deformation caused by thermal expansion and contraction and improving the fit with the copper tube. The use of a rotating and advancing punch on the mold can effectively avoid the problem of uneven material in the tube during the stretching process. By applying torque to the tube material through active friction, the material is forced to undergo compression deformation in the height direction and shear deformation in the cross section during the pressing and twisting process, thus eliminating the harmful effects of friction in extrusion forming and reducing forming force. In addition, only the punch structure is modified in traditional molds, without the need for major modifications to the existing molds, which saves costs, especially in progressive dies; Finally, based on the finned structure designed above, this application proposes a copper-tube-free heat sink. It replaces the copper tube structure with overlapping welded fin holes to form a circuit. Through the design of embossed raised edges, spiral raised edges, and indented patterns, as well as its self-locking characteristics, it avoids solder flow problems during welding, and its own structure ensures the stability of the fins during use. This design allows for better application in scenarios such as power supply heat sinks.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the fin structure of this application; Figure 2 yes Figure 1 Enlarged schematic diagram of figure 12 in the attached figure; Figure 3 This is a schematic diagram of the structure of fins connected to copper tubes; Figure 4 This is a schematic diagram of a heat sink without copper pipes; Figure 5 This is a schematic diagram of the overall structure of the stretching die of this application; Figure 6 This Figure 5 Enlarged view of point A in the middle; Figure 7 This is a structural schematic diagram of the punch head and the push head of this application; Figure 8 This is a cross-sectional view of the propulsion head of this application; Figure 9 This is a schematic diagram of the punch head structure of this application. Figure 1 ; Figure 10 This is a schematic diagram of the punch head structure of this application. Figure 2 .

[0019] Reference numerals: 1. Fin body; 10. Tube hole; 11. Indentation pattern; 12. Spiral raised pattern; 121. Toothed raised structure; 1211. Arc-shaped transition rounded corner; 1212. Sharp corner; 13. Indentation raised pattern; 100. Punch head; 101. Expansion block; 102. Connecting rod; 103. Inner core; 104. Base; 105. Slide groove; 106. Bolt; 200. Push head; 201. Ball bearing; 202. Drive rod; 203. Pressure roller; 204. Output shaft; 205. Base plate; 206. Cam groove; 207. Housing; 208. Camshaft; 209. Push rod; 300, push rod; 400. Cavity sleeve; 401. Step structure. DETAILED DESCRIPTION

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should be understood that, in order to clearly describe the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. For example, the first groove and the second groove are only used to distinguish different grooves and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0024] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0025] This embodiment proposes a radiator fin, its processing technology, and a stretching die.

[0026] Heat sink fin structure reference Figure 1 As shown, it includes a fin body 1 and a tube hole 10 stamped on the fin body 1. An embossed protrusion 13 is provided at the transition connection between the proximal end of the tube hole 10 and the fin body 1. A spiral protrusion 12 is provided at the distal end of the tube hole 10. An outwardly protruding indentation pattern 11 is provided on the peripheral wall of the tube hole 10. The indentation pattern 11 extends along the axial direction of the tube hole 10.

[0027] Continue to refer to Figure 2 As shown, the spiral protrusion 12 has at least two mutually spaced toothed protrusion structures 121. The toothed protrusion structure 121 has a concave center, with one side being an arc-shaped transition fillet 1211 and the other side being a sharp corner 1212, which connects to the side of the spiral protrusion 12. This structural design improves the support of the toothed protrusion structure. In practical applications, the sharp corner 1212 is also a rounded chamfer design, but the chamfer radius is smaller than that of the arc-shaped transition fillet 1211. It is worth mentioning that the spiral protrusion 12 is located at the end of the tube hole 10. During the die stretching process, it is at the very end of the material flow. First, the small-angle sharp corner 1212 accelerates the material flow speed, quickly pushing the stretched material at the front to rise and improve the plasticity of the tail material. Then, the large-angle arc-shaped transition fillet 1211 decelerates and pushes the material upward, increasing the material strain and resulting in a better stretching and thinning forming effect at the end of the tube hole 10. The central indentation between the two chamfers provides support and gives the protrusion itself a certain degree of elastic support.

[0028] The shape of the embossed protrusion 13 can be designed to match the spiral protrusion 12, or a semi-circular protrusion structure can be used. Because the embossed protrusion 13 is located at the starting point of the stretching of the tube hole 10, the stress change after stretching is relatively small.

[0029] The indentation pattern 11 has an overall V-shaped structure. This structure generates a certain elastic potential energy in the circumference of the tube hole 10, which is used to control the deformation caused by the internal stress on the circumference of the tube hole 10 after processing.

[0030] The embossed protrusions 13 and the spiral protrusions 12 are located at the proximal and distal ends of the tube hole 10, respectively, and the embossed texture 11 is located in the middle position, which improves the elasticity of the tube hole 10 structure.

[0031] Reference Figure 3 As shown, in the traditional radiator manufacturing process, after the fin body 1 is completed, a copper tube is inserted into the tube hole 10, and then a tube expander is used to expand the tube, so that the copper tube and the fin tube hole 10 are fixedly attached. The above structural design has two effects in this process. First, before tube expansion, the upper and lower fins can achieve self-locking by means of the embossed protrusions 13 and the spiral protrusions 12. Referring to the figure, after the tube hole 10 of the fin body 1 is stretched and thinned, it is necessary to flip the hole. After the hole is flipped, the embossed protrusions 13 and the spiral protrusions 12 of the upper and lower layers are exactly aligned, achieving overlapping self-locking. Second, during the tube expansion process, the above design gives the tube hole 10 better elasticity, which can adaptively adjust the fit with the copper tube. Finally, during normal use of the radiator, the better elasticity allows the fin body 1 to still fit with the copper tube when subjected to thermal expansion and contraction, reducing noise generation.

[0032] The processing technology of the fin body 1, especially the stretching process, is as follows: First, a tube hole is punched out on the fin body 1. Then, a rotating and advancing punch head is used to stretch and thin the tube hole 10. During the thinning process, the punch head and the die head are used to extrude the embossed protrusions 13, the spiral protrusions 12 and the indentation patterns 11.

[0033] It is worth mentioning that, in addition to its advantages in traditional radiators with copper tubes, the fin structure described above also provides a new radiator structure based on this fin structure, as described in this embodiment. Figure 4 As shown, the tube holes 10 of the multi-layered finned bodies 1 are stacked on top of each other, and are connected sequentially through the tube holes 10 to form a passage, thus forming a heat sink body without copper tubes. Specifically, the processing steps are as follows: First, the distal end of the tube hole 10 is pressed using a mold, resulting in a narrowed distal end. When adjacent layers of finned bodies 1 are stacked, the distal end of the tube hole 10 of one finned body 1 is inserted into the proximal end of the tube hole 10 of another finned body 1. (Refer to...) Figure 4As shown, after the edge is pressed, the far end of the tube hole 10 forms an inward fold structure. The spiral protrusion 12 is set at the bend of the inward fold structure, and the embossed protrusion 13 is set at the corner of the bottom end of the tube hole 10. The two fit together and lock themselves during welding.

[0034] Before this step, nickel-based brazing filler is applied to the area of ​​the tube hole to be welded. After the butt joint is completed, the embossed protrusions 13 and spiral protrusions 12 of the adjacent tube holes 10 are matched and snapped together, and finally placed in the welding furnace for welding and fixing.

[0035] The embossed protrusions 13 and the spiral protrusions 12 can be pre-positioned before welding, preventing solder loss during the welding process. The designed embossed texture 11 can prevent tube hole deformation and maintain normal internal refrigerant flow. In practical applications, only the material thickness at the tube hole needs to be adjusted. Moreover, in this embodiment, the tube hole is thinned and stretched by rotating a punch, and its inner wall surface has marks similar to those of an internally threaded copper tube, which can increase the heat exchange area.

[0036] Finally, this embodiment also proposes a fin stretching die for stretching and thinning fin tube holes.

[0037] For specific structure reference Figures 5-10 As shown: Upper mold and lower mold, wherein: The upper mold is fixedly installed with a cavity sleeve 400, and a push rod 300 is slidably installed in the inner cavity of the cavity sleeve 400. The upper end of the push rod 300 is connected to a return spring. The lower die is equipped with a punch head 100 and a push head 200, as well as a drive column for pushing the punch head 100 and the push head 200 to move up and down; The punch head 100 is configured with an expanding plug structure. When the ejector pin 300 is inserted into the punch head 100, the outer wall of the punch head 100 expands outward. (Refer to...) Figure 9 as well as Figure 10As shown, the punch head 100 includes several expansion blocks 101, which together form a cylindrical structure, an inner core 103, and a base 104. Each expansion block 101 has an L-shaped structure. A radial groove 105 is formed on the end face of the base 104. The bottom of each expansion block 101 is slidably connected to the groove 105. The inner wall of each expansion block 101 is hinged to the inner core 103 via two vertically arranged connecting rods 102. In practical applications, a mechanism can be designed to reset the expansion blocks 101 using springs. For example, a cylindrical spring can be installed in the groove 105 to push the expansion blocks 101 to contract, or a torsion spring can be installed on the connecting shaft of the connecting rods 102 to achieve the same effect. It is worth noting that the force provided by the spring-reset expansion block 101 is less than the force provided by the reset spring connected to the push rod 300, ensuring that the push rod 300 can lift and expand the expansion blocks 101. In addition, the lower end of the push rod 300 is configured as a rotating structure, or a ball is directly connected to the bottom of the push rod 300 so that the ball can rotate together when the push rod 300 pushes the inner core 103, thus avoiding motion interference.

[0038] The push head 200 includes an output shaft 204, which is fixedly connected to the punch head 100. A cam shaft 208 is fixedly connected to the bottom of the output shaft 204. A cam groove 206 is formed on the outer peripheral surface of the cam shaft 208. A drive rod 202 is sleeved on the cam shaft 208. A ball bearing 201 is installed on the inner side of the drive rod 202 and is housed in the cam groove 206. A push rod 209 is connected to the bottom of the drive rod 202. The push rod 209 performs up and down extension and retraction movements. The drive rod 202 drives the cam shaft 208 to rotate, thereby driving the punch head 100 to rotate.

[0039] Reference Figure 7 as well as Figure 8 As shown, the push head 200 also includes a housing 207. The outer diameter of the housing 207 is smaller than that of the punch head 100 in the expanded state. A pressure roller 203 is connected to the outer side of the drive rod 202. An axial through groove is provided on the housing 207 to expose the pressure roller 203.

[0040] In addition, the output shaft 204 of the push head 200 is fixedly connected to the base plate 205, and the base 104 of the punch head 100 is fixedly connected to the base plate 205 by surface-mounted bolts 106.

[0041] The bottom of the die sleeve 400 is provided with a stepped structure 401, which is transitioned by a rounded chamfer. The outer side of the stepped structure 401 is provided with a forming surface for forming embossed protrusions 13. The inner peripheral wall of the die sleeve 400 is provided with a forming surface along the axial direction to cooperate with the pressure roller 203 to form an indentation pattern 11. The upper inner peripheral wall of the die sleeve 400 is also provided with a forming surface for forming a spiral protrusion 12.

[0042] The mold processing procedure is as follows: The fin body 1 is pushed to the stretching station, with the tube hole 10 positioned at the bottom of the die sleeve 400. The upper die moves downwards, and during this process, the drive column drives the push head 200 and the punch head 100 to move upwards and enter the tube hole. At this time, the tube hole 10 also gradually enters the die sleeve 400. When the punch head 100 contacts and presses against the push rod 300, the expansion block 101 slowly unfolds in the tube hole 10. At this time, the drive push rod 209 moves upwards, and under the action of the drive rod 202 and the cam shaft 208, the punch head 100 rotates. As the expansion block 101 unfolds, the tube hole 10 expands radially and fits against the die sleeve 400. The punch head 100 continues to rotate upwards, stretching and thinning the tube hole 10. Under the action of the die sleeve 400's forming surface, a spiral protrusion 12 (formed by the punch head rotating, pushing, stretching, and fitting the forming surface) and an embossed protrusion 13 (formed by the lower die structure pressing the bottom of the tube hole against the forming surface) are created. During this process, the punch head 100 pushes and stretches at the front end, and the pressure roller 203 installed inside the housing 207 also enters the tube hole, processing it to form an indentation pattern 11. When the upper and lower dies are closed and the punch head 100 reaches its highest point, the drive column drives the punch head 100 to move downward. At this time, the drive rod 202 also moves downward, causing the punch head 100 to rotate in the opposite direction. Here, the inner wall of the tube hole 10 is shaped, and finally it exits the tube hole 10. After the ejector rod 300 separates from the inner core 103, the expansion block 101 automatically contracts.

[0043] During this process, because the die sleeve 400 is provided with a forming surface of spiral protrusions 12, when the punch head 100 pushes to this point, the outer wall of the tube hole 10 contacts the protrusions of the forming surface. Under the action of the rotational torque of the punch head, the material in the tube hole 10 exhibits different flow velocities, which can effectively increase the strain (the punch head 100 rotates and pushes forward, and the material flows in a spiral extrusion manner, so one side will definitely contact the forming surface first, thereby achieving a speed difference). Through the protrusions of the forming surface and the action of rotational torque, the material is simultaneously extruded into protrusions, which can achieve the effect of uniform material distribution and compensation at the protrusions, avoiding the undesirable effect of uneven thickness at the ends. If there is no forming surface at the end, and the material is directly rotated to the end, uneven thickness is likely to occur at the end. However, the concave and convex forming surfaces will slow down the material spirally pushed at the front end, preventing the material at the front end from being pushed too fast and forming uneven thickness at the end.

[0044] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A radiator fin, characterized in that: The invention comprises a fin body (1) and a tube hole (10) punched out on the fin body (1), wherein an embossed protrusion (13) is provided at a transitional connection between the proximal end of the tube hole (10) and the fin body (1), a spiral protrusion (12) is provided at the distal end of the tube hole (10), and an outwardly convex embossed pattern (11) is provided on a peripheral wall of the tube hole (10), and the embossed pattern (11) extends along the axial direction of the tube hole (10).

2. A radiator fin according to claim 1, characterized in that: The spiral protrusion (12) is provided with at least two tooth-shaped protrusion structures (121) spaced apart from each other, the middle of the tooth-shaped protrusion structure (121) is concave, one side is an arc-shaped transition fillet (1211), and the other side is a sharp corner (1212) connected to the side of the spiral protrusion (12).

3. A radiator fin according to claim 2, characterized in that: The tube holes (10) of the multi-layer fin bodies (1) are superimposed on each other and are sequentially connected through the tube holes (10) to form a passage, thereby forming a radiator body without copper tubes.

4. A processing technology for radiator fins, characterized in that: A method for processing a radiator fin according to any one of claims 1 to 3, comprising the following steps: first, punching out a tube hole on a fin body (1), then using a rotating punch head to stretch and thin the tube hole (10), and in the thinning process, using the punch head and the die to extrude an embossed protrusion (13), a spiral protrusion (12) and an indentation pattern (11).

5. A radiator fin processing technology according to claim 4, characterized in that: The invention also includes the steps of processing a heat sink body without copper tubes: firstly, the distal end of the tube hole (10) is pressed by a mold, and the distal end of the tube hole (10) after pressing is a shrinkage structure. When adjacent layers of fin bodies (1) are stacked, the distal end of the tube hole (10) of one fin body (1) is inserted into the proximal end of the tube hole (10) of another fin body (1). Before this step, the position of the tube hole to be welded is pre-coated with nickel-based brazing material. After the butt joint is completed, the embossed protrusions (13) and the spiral protrusions (12) of the adjacent tube holes (10) are matched and clamped with each other, and finally placed in a welding furnace for welding and fixing.

6. A radiator fin drawing die, characterized in that: Used for processing the radiator fin according to any one of claims 1 to 3, comprising the following structure: Upper die and lower die, wherein: The upper die is fixedly mounted with a die sleeve (400), a push rod (300) is slidably mounted in the inner cavity of the die sleeve (400), and the upper end of the push rod (300) is connected to a return spring; The lower die is equipped with a punch head (100) and a push head (200), as well as a driving column for pushing the punch head (100) and the push head (200) to move up and down; The punch head (100) is configured as an expansion plug structure, and when the ejector rod (300) is inserted into the punch head (100), the outer wall of the punch head (100) expands outwards; The push head (200) comprises an output shaft (204), the output shaft (204) is fixedly connected to the punch head (100), a cam shaft (208) is fixedly connected to the bottom of the output shaft (204), a cam groove (206) is provided on the outer peripheral surface of the cam shaft (208), a driving rod (202) is sleeved on the cam shaft (208), a ball (201) is installed on the inner side of the driving rod (202), the ball (201) is accommodated in the cam groove (206), a push rod (209) is connected to the bottom of the driving rod (202), the push rod (209) performs an upward and downward telescopic action, and the driving rod (202) is used to drive the cam shaft (208) to rotate, thereby driving the punch head (100) to rotate.

7. A radiator fin drawing die according to claim 6, characterized in that: The male die head (100) comprises an expansion block (101), an inner core (103) and a base (104); the expansion block (101) is an L-shaped structure; a radial slide groove (105) is provided on the end surface of the base (104); the bottom of the expansion block (101) is slidably connected to the slide groove (105); and the inner side wall of the expansion block (101) is hinged to the inner core (103) via two upper and lower connecting rods (102).

8. The stretching die for heat sink fins according to claim 7, characterized in that: The pushing head (200) further comprises a shell (207), the outer diameter of the shell (207) being smaller than the male die head (100) in the expanded state, the outer side of the driving rod (202) being connected to a pressing wheel (203), and an axial through groove being provided on the shell (207) for exposing the pressing wheel (203).

9. The drawing die for heat sink fins according to claim 7, characterized in that: The output shaft (204) of the thrust head (200) is fixedly connected to a base plate (205), and the base (104) of the punch head (100) is fixedly connected to the base plate (205) via surface-mounted bolts (106).

10. The drawing die for heat sink fins according to claim 8, characterized in that: The bottom of the die sleeve (400) is provided with a step structure (401), the step structure (401) adopts a circular arc chamfer transition, the outer side of the step structure (401) is provided with a molding surface for forming an embossed protrusion (13), the inner peripheral wall of the die sleeve (400) is provided with a molding surface along the axial direction for cooperating with the pressing wheel (203) to form an embossed pattern (11), and the upper inner peripheral wall of the die sleeve (400) is also provided with a molding surface for forming a spiral pattern protrusion (12).

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