Radiator fin and its processing technology and stretching die

Abstract

The present application discloses a radiator fin and its processing technology and stretching die, which relates to the field of radiator technology, including a fin body and a tube hole punched out on the fin body, an embossed protrusion is provided at the transition connection between the proximal end of the tube hole and the fin body, a spiral protrusion is provided at the distal end of the tube hole, and an outwardly protruding indentation pattern is provided on the peripheral wall of the tube hole, and the indentation pattern extends along the axial direction of the tube hole. On the fin structure, the embossed protrusion and the spiral protrusion are provided to realize the self-locking of the fin at the stage of the sleeve, keep the fin position fixed to each other, and prevent displacement during subsequent processing and transportation; in addition, the embossed protrusion and the spiral protrusion are respectively located at the two ends of the tube hole, and the design of the protrusion structure at both ends can effectively absorb the deformation caused by internal stress, and cooperate with the indentation pattern provided in the middle of the tube hole to give the tube hole a certain elastic potential energy, which can effectively avoid deformation caused by thermal expansion and contraction, and improve the fit with the copper tube.

Description

Technical Field

[0001] The present application relates to the technical field of radiators, and in particular to a radiator fin and a processing technology and a stretching die thereof. Background Art

[0002] Finned heat sink is a common heat sink. The usual process is to first use a mold to produce the fins, and then insert a long U copper tube into the fins (refer to Figure 3 As shown in the figure), the fins are then expanded to ensure that the fins and the copper tubes are fixed, and finally a small U copper tube is welded at the end to form a closed loop space, and finally refrigerant is injected into the loop space.

[0003] In the existing process, the fins are thinned and stretched through the die, which will cause the thickness of the surrounding wall material of the tube hole to be uneven, affecting the heat conduction efficiency. Internal stress will also cause the tube hole to deform, which is not conducive to subsequent processing and use, so improvements are needed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present application provides a radiator fin and a processing technology and a stretching die thereof.

[0005] A radiator fin, comprising:

[0006] It includes a fin body and a tube hole punched out on the fin body. An embossed protrusion is arranged at the transition connection between the proximal end of the tube hole and the fin body, a spiral protrusion is arranged at the distal end of the tube hole, and an outwardly convex embossing pattern is arranged on the peripheral wall of the tube hole, and the embossing pattern extends along the axial direction of the tube hole.

[0007] In a radiator fin provided in the present application, the spiral protrusion is provided with at least two tooth-shaped protrusion structures spaced apart from each other, the middle part of the tooth-shaped protrusion structure is concave, and one side is an arc-shaped transition fillet, and the other side is a sharp corner connected to the side of the spiral protrusion.

[0008] In a radiator fin provided in the present application, tube holes of multiple layers of fin bodies are superimposed on each other and are sequentially connected through the tube holes to form a passage, thereby forming a radiator body without copper tubes.

[0009] The present application also proposes a processing technology for radiator fins, which is used to process the above-mentioned radiator fins, including the following steps: first, a tube hole is punched out on the fin body, and then a rotating and propelled punch head is used to stretch and thin the tube hole. During the thinning process, the punch head and the die are used to extrude embossed protrusions, spiral protrusions and indentation patterns.

[0010] In a processing technology for radiator fins provided in the present application, the processing steps of a radiator body without a copper tube are also included: first, the distal end of the tube hole is crimped using a mold, and the distal end of the tube hole after crimping is a shrinkage structure. When adjacent layers of fin bodies are stacked, the distal end of the tube hole of one fin body is inserted into the proximal 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 material. After the docking is completed, the embossed protrusions and spiral protrusions of adjacent tube holes are matched and clamped with each other, and finally placed in a welding furnace for welding and fixing.

[0011] The present application also proposes a radiator fin stretching die, which is used to process the radiator fin, and includes the following structure:

[0012] Upper die and lower die, wherein:

[0013] The upper die is fixedly mounted with a die sleeve, an ejector rod is slidably mounted in the inner cavity of the die sleeve, and the upper end of the ejector rod is connected with a return spring;

[0014] The lower die is equipped with a punch head and a push head, and a driving column for pushing the punch head and the push head to move up and down;

[0015] The punch head is set as an expansion plug structure. When the ejector pin is inserted into the punch head, the outer wall of the punch head expands outwards.

[0016] The pushing head includes an output shaft, which is fixedly connected to the punch head. A camshaft is fixedly connected to the bottom of the output shaft. A cam groove is provided on the outer circumference of the camshaft. A driving rod is sleeved on the camshaft. A ball is installed on the inner side of the driving rod and the ball is accommodated in the cam groove. A push rod is connected to the bottom of the driving rod. The push rod performs an up and down telescopic action. The driving rod is used to drive the camshaft to rotate, thereby driving the punch head to rotate.

[0017] In a radiator fin stretching die provided in the present application, the punch head includes an expansion block, an inner core and a base. The expansion block is an L-shaped structure. A radial slide groove is provided on the end face of the base. The bottom of the expansion block is slidably connected to the slide groove. The inner side wall of the expansion block is hinged to the inner core by two connecting rods arranged up and down.

[0018] In a radiator fin stretching die provided in the present application, the pushing head also includes an outer shell, the outer diameter of the outer shell is smaller than the punch head in the expanded state, a pressure wheel is connected to the outer side of the driving rod, and an axial through groove is opened on the outer shell for the pressure wheel to be exposed.

[0019] In a radiator fin stretching die provided in the present application, the output shaft of the pusher head is fixedly connected to the base plate, and the base of the punch head is fixedly connected to the base plate via surface-mounted bolts.

[0020] In a radiator fin stretching die provided in the present application, a step structure is provided at the bottom of a die sleeve, the step structure adopts a circular arc chamfer transition, a molding surface for forming an embossed protrusion is provided on the outer side of the step structure, a molding surface for cooperating with a pressing wheel to form an embossing pattern is provided along the axial direction on the inner circumferential wall of the die sleeve, and a molding surface for forming a spiral protrusion is also provided on the upper inner circumferential wall of the die sleeve.

[0021] In summary, this application mainly has the following beneficial effects:

[0022] First, on the fin structure, the embossed protrusions and the spiral protrusions are set to achieve self-locking of the fins at the stage of casing, keep the fin positions fixed to each other, and prevent displacement during subsequent processing and transportation; in addition, the embossed protrusions and the spiral protrusions are respectively located at both ends of the tube hole. The design of the protrusion structure at both ends can effectively absorb the deformation caused by internal stress, and cooperate with the indentation pattern set in the middle of the tube hole to give the tube hole a certain elastic potential energy, which can effectively avoid deformation caused by thermal expansion and contraction, and improve the fit with the copper tube;

[0023] The use of a rotating thrust punch on the die can effectively avoid the problem of uneven tube hole material during the stretching process. The active friction force is used to apply torque to the tube hole material, forcing the material to produce compression deformation in the height direction and shear deformation on the cross section during the compression and twisting process, eliminating the harmful effects of friction during extrusion forming and reducing the forming force.

[0024] In addition, only the punch structure is changed on the traditional mold, and there is no need to make major modifications to the existing mold, which saves costs, especially in progressive dies;

[0025] Finally, based on the above-designed fin structure, this application proposes a copper-free heat sink, which replaces the copper tube structure to form a loop through the superposition welding of the fin tube holes. The design of embossed protrusions, spiral protrusions and indentation patterns, as well as the self-locking characteristics, can avoid solder flow during welding, and its own structure can also ensure the stability of the fins during use. It can be better applied in some scenarios such as power supply heat sinks.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 is a schematic diagram of the fin structure of the present application;

[0029] Figure 2 yes Figure 1 An enlarged schematic diagram of the reference numeral 12;

[0030] Figure 3 It is a schematic diagram of the structure of the fin connected copper tube;

[0031] Figure 4 It is a schematic diagram of the structure of a radiator without copper tubes;

[0032] Figure 5 It is a schematic diagram of the overall structure of the stretching die of this application;

[0033] Figure 6 This Figure 5 The enlarged schematic diagram at A in the middle;

[0034] Figure 7 It is a structural schematic diagram of the punch head and the push head of the present application;

[0035] Figure 8 It is a schematic diagram of the dissected state of the propulsion head of the present application;

[0036] Fig. 9 This is a schematic diagram of the structure of the punch head of this application Figure 1 ;

[0037] Fig.10 This is a schematic diagram of the structure of the punch head of this application Figure 2 .

[0038] Reference numerals:

[0039] 1. Fin body; 10. Tube hole; 11. Indentation pattern; 12. Spiral pattern protrusion; 121. Tooth-shaped protrusion structure; 1211. Arc transition fillet; 1212. Sharp corner; 13. Embossed protrusion;

[0040] 100, punch head; 101, expansion block; 102, connecting rod; 103, inner core; 104, base; 105, slide groove; 106, bolt;

[0041] 200, push head; 201, ball; 202, drive rod; 203, pressure wheel; 204, output shaft; 205, base plate; 206, cam groove; 207, housing; 208, cam shaft; 209, push rod;

[0042] 300, ejector rod;

[0043] 400, die sleeve; 401, step structure. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] It should be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0047] It should be understood that, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same items or similar items with substantially the same functions and effects. For example, the first groove and the second groove are only used to distinguish different grooves, and their order is not limited. Those skilled in the art can understand that the words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not necessarily limit them to be different.

[0048] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] This embodiment provides a heat sink fin, a processing technology thereof, and a drawing die.

[0050] Radiator fin structure reference Figure 1 As shown, it includes a fin body 1 and a tube hole 10 punched out 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, and an outwardly convex embossing pattern 11 is provided on the peripheral wall of the tube hole 10, and the embossing pattern 11 extends along the axial direction of the tube hole 10.

[0051] Continue to refer to Figure 2As shown, the spiral protrusion 12 is provided with at least two tooth-shaped protrusion structures 121 spaced apart from each other, the middle part of the tooth-shaped protrusion structure 121 is concave, and one side is an arc-shaped transition fillet 1211, and the other side is a sharp corner 1212, which is connected to the side of the spiral protrusion 12. This structural design can make the tooth-shaped protrusion structure more supportive. In practical applications, the sharp corner 1212 is also designed as an arc chamfer, but the chamfer radius is smaller than 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 and is at the end of the material flow during the die stretching process. First, the material flow speed is accelerated through the small-angle sharp corner 1212, and the material stretched in the front section is quickly raised and pushed out, thereby improving the plasticity of the tail material. Then, the material is decelerated and pushed upward through the large-angle arc-shaped transition fillet 1211, increasing the material strain, so that the stretching and thinning forming effect at the end of the tube hole 10 is better. The middle depression between the two chamfers can provide support and make the protrusion itself have a certain elastic support.

[0052] The shape of the embossed protrusion 13 can be designed to match the spiral protrusion 12, or a semicircular 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.

[0053] The embossing pattern 11 is in a V-shaped structure as a whole, which generates a certain elastic potential energy in the circumferential direction of the tube hole 10, and is used to control the deformation caused by the internal stress of the lateral part of the tube hole 10 after processing.

[0054] The embossed protrusions 13 and the spiral protrusions 12 are respectively located at the proximal end and the distal end of the tube hole 10 , and the embossed pattern 11 in the middle, so as to improve the elasticity of the tube hole 10 structure.

[0055] Reference Figure 3 As shown, during the processing of the traditional radiator, after the fin body 1 is completed, the copper tube is inserted into the tube hole 10, and then the tube is expanded by a tube expander, so that the copper tube and the fin tube hole 10 are fixedly fitted. The above structural design has two effects in this process. First, before the tube is expanded, the upper and lower layers of the fins can achieve self-locking by relying on 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 turn the hole. After turning the hole, the embossed protrusions 13 and the spiral protrusions 12 of the upper and lower layers are exactly opposite to each other, so as to achieve overlapping self-locking. Second, in the process of expanding the tube, the above design gives the tube hole 10 better elastic properties, which can adaptively adjust the fit with the copper tube. Finally, during the normal use of the radiator, the better elastic properties enable the fin body 1 to still fit with the copper tube when it is subjected to thermal expansion and contraction, thereby reducing the generation of noise.

[0056] The processing technology of the fin body 1, especially the stretching technology, is as follows: first, a tube hole is punched out on the fin body 1, and then a rotating punch head is used to stretch and thin the tube hole 10. During the thinning process, the punch head and the die are used to extrude the embossed protrusion 13, the spiral protrusion 12 and the indentation pattern 11.

[0057] It is worth noting that the fin structure designed above has advantages in addition to being applied to traditional radiators with copper tubes. This embodiment also designs a new radiator structure based on the fin structure above. Figure 4 As shown, the tube holes 10 of the multiple layers of fin bodies 1 are superimposed on each other, and the tube holes 10 are connected in sequence to form a passage, forming a heat sink body without copper tubes. Specifically, the processing steps are: first, 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 shrinking structure. When the adjacent layers of fin bodies 1 are superimposed, 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. Figure 4 As shown, after the edge pressing, the far end of the tube hole 10 forms an inward folding structure, the spiral protrusion 12 is arranged at the bending part of the inward folding structure, and the embossed protrusion 13 is arranged at the corner of the bottom end of the tube hole 10, and the two are fitted and self-locked when welding.

[0058] 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 adjacent tube holes 10 are matched and clamped with each other, and finally put into a welding furnace for welding and fixing.

[0059] The embossed protrusions 13 and the spiral protrusions 12 can be pre-positioned before welding. Solder loss is avoided during the welding process. The designed embossing pattern 11 can avoid deformation of the tube hole and maintain the normal circulation of the internal refrigerant. In actual application, it is only necessary to adjust the material thickness at the tube hole. Moreover, the tube hole of this embodiment adopts a rotary punch, and the thinning and stretching is achieved by rotary advancement. The inner wall surface has traces similar to the internal threaded copper tube, which can increase the heat exchange area.

[0060] Finally, this embodiment also proposes a fin stretching die for performing a stretching and thinning operation on the fin tube holes.

[0061] Specific structure reference Figure 5-Figure 10 As shown:

[0062] Upper die and lower die, wherein:

[0063] The upper die is fixedly mounted with a die sleeve 400, and 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;

[0064] The lower die is equipped with a punch head 100 and a push head 200, and a driving column for pushing the punch head 100 and the push head 200 to move up and down;

[0065] The punch head 100 is configured as an expansion plug structure. When the ejector rod 300 is inserted into the punch head 100, the outer wall of the punch head 100 expands outwards; Fig. 9 as well as Fig.10 As shown, the punch head 100 includes a plurality of expansion blocks 101, and the plurality of expansion blocks 101 form a cylindrical structure, an inner core 103 and a base 104. The expansion block 101 is an L-shaped structure, and a radial slide groove 105 is provided on the end face 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 through two upper and lower connecting rods 102. In practical applications, a set of mechanisms for resetting the expansion block 101 can be designed by springs, such as installing a cylindrical spring in the slide groove 105 to push the expansion block 101 to contract, or installing a torsion spring on the connecting shaft of the connecting rod 102 to achieve the same effect. It is worth mentioning that the force provided by the spring reset expansion block 101 is smaller than the force provided by the reset spring connected to the push rod 300, so as to ensure that the push rod 300 can lift the expansion block 101 to expand. In addition, the lower end of the top rod 300 is set to a rotating structure, or a ball is directly connected to the bottom of the top rod 300 for rotation. When the top rod 300 pushes the inner core 103, the ball can rotate together to avoid motion interference.

[0066] The pushing 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 provided on the outer peripheral surface of the cam shaft 208. The cam shaft 208 is sleeved with a driving rod 202. 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 up and down telescopic action. The driving rod 202 is used to drive the cam shaft 208 to rotate, thereby driving the punch head 100 to rotate.

[0067] Reference Figure 7 as well as Figure 8 As shown, the pushing head 200 also includes a shell 207, the outer diameter of the shell 207 is smaller than the male die head 100 in the expanded state, the outer side of the driving rod 202 is connected to a pressure wheel 203, and an axial through groove is opened on the shell 207 to expose the pressure wheel 203.

[0068] 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 via surface-mounted bolts 106 .

[0069] A step structure 401 is provided at the bottom of the die sleeve 400, and the step structure 401 adopts an arc chamfer transition. A molding surface for forming an embossed protrusion 13 is provided on the outer side of the step structure 401. The inner circumferential wall of the die sleeve 400 is axially provided with a molding surface for cooperating with the pressing wheel 203 to form an embossing pattern 11. The upper inner circumferential wall of the die sleeve 400 is also provided with a molding surface for forming a spiral protrusion 12.

[0070] The mold processing process is as follows:

[0071] The fin body 1 is pushed to the stretching station, and the position of the tube hole 10 is at the bottom of the female die sleeve 400. The upper die moves downward, and during this process, the driving column drives the push head 200 and the punch head 100 to move upward into the tube hole, and the tube hole 10 also gradually enters the female die sleeve 400. When the punch head 100 contacts and presses the push rod 300, the expansion block 101 slowly expands in the tube hole 10. At this time, the driving push rod 209 moves upward, and under the action of the driving rod 202 and the cam shaft 208, the punch head 100 rotates. As the expansion block 101 is unfolded, the tube hole 10 is radially expanded to fit the die sleeve 400, and the punch head 100 continues to move upward during rotation, stretching and thinning the tube hole 10. Under the action of the forming surface of the die sleeve 400, the spiral protrusion 12 (the spiral protrusion 12 is formed by the punch head rotating and pushing the stretching to match the forming surface) and the embossed protrusion 13 (the embossed protrusion 13 is formed by the lower die structure extruding the bottom of the tube hole to match the forming surface). In this process, the punch head 100 pushes and stretches at the front end, and the pressing wheel 203 installed in the shell 207 also enters the tube hole to process the tube hole to form the embossed pattern 11. When the upper and lower molds are closed and the punch head 100 reaches the highest point, the driving column drives the punch head 100 to move downward. At this time, the driving rod 202 also moves downward, driving the punch head 100 to rotate in the opposite direction, thereby shaping the inner wall of the tube hole 10 and finally withdrawing from the tube hole 10. When the push rod 300 is separated from the inner core 103, the expansion block 101 automatically shrinks.

[0072] In this process, since the die sleeve 400 is provided with a molding surface with a travel spiral protrusion 12, when the punch head 100 is pushed there, the outer wall of the tube hole 10 contacts the protrusion of the molding surface. Under the action of the rotating torque of the punch head, the material of the tube hole 10 presents different flow speeds, which can effectively increase the strain (the punch head 100 rotates and pushes forward, and the material is extruded and flows in a spiral shape. One side must contact the molding surface first, so as to achieve the speed difference). Through the protrusion of the molding surface and the action of the rotating torque, the material is extruded into protrusions at the same time, which can achieve the effect of equalizing the material, and it is compensated at the protrusion to avoid the adverse effect of uneven thickness at the end. If there is no molding surface at the end, it is directly rotated to the bottom, which is easy to cause uneven thickness at the end. The concave and convex molding surface will have a deceleration effect on the material that is spirally pushed forward at the front end, avoiding the front end material from being pushed too fast and forming uneven thickness at the end.

[0073] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A processing technology for radiator fins, characterized in that: Used for processing radiator fins, comprising the following steps: first punching out a tube hole on a fin body (1), then using a rotating and advancing 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 indented pattern (11); The process also includes the following steps for processing a heat sink body without a copper tube: first, 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 a 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; The heat sink fin comprises a fin body (1) and a tube hole (10) punched out 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 convex embossing pattern (11) is provided on the peripheral wall of the tube hole (10); the embossing pattern (11) extends along the axial direction of the tube hole (10); the spiral protrusion (12) is provided with at least two tooth-shaped protrusion structures (121) spaced apart from each other; the middle part of the tooth-shaped protrusion structure (121) is concave, and 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); the tube holes (10) of the multiple layers of the fin body (1) are superimposed on each other and are sequentially connected through the tube holes (10) to form a passage, thereby forming a heat sink body without a copper tube.

2. A radiator fin drawing die, characterized in that: For processing the radiator fin manufactured by the processing technology of claim 1, comprising the following structure: An upper die and a 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.

3. A radiator fin drawing die according to claim 2, 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).

4. The drawing die for heat sink fins according to claim 3, 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).

5. The drawing die for heat sink fins according to claim 3, 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).

6. The drawing die for heat sink fins according to claim 4, 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).

Images