An extrusion die for aluminum alloy heat sink fins

Abstract

The present invention provides an extrusion die for aluminum alloy heat sink fins, wherein a support seat is fixedly connected to the body of an extruder; a pretreatment die is fixedly arranged at the front of the support seat, comprising a first die cavity that is axially through and whose cross section gradually decreases along the processing direction, and the front end of the first die cavity is connected to the outlet of the extruder; a forming die is fixedly arranged at the middle of the support seat, and is provided with a second die cavity connected to the rear end of the first die cavity, comprising a fin forming cavity adapted to the fin and a substrate forming cavity adapted to the substrate; a shaping die is fixedly arranged at the rear of the support seat, and is provided with a third die cavity connected to the rear end of the second die cavity, comprising a fin shaping cavity adapted to the fin and a substrate shaping cavity adapted to the substrate. The extrusion force energy consumption is reduced, and the aluminum alloy heat sink fins are supported and supported in a timely manner, and the groove and through-hole structure of the heat sink fins are processed at the same time, so as to improve the heat dissipation efficiency of the produced aluminum alloy heat sink fins.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy heat sink fin extrusion processing, and in particular provides an extrusion die for an aluminum alloy heat sink fin. Background Art

[0002] Aluminum alloy heat dissipation structures have the characteristics of good heat dissipation effect and high precision, and are widely used in the heat dissipation of electronic products. At present, aluminum alloy heat dissipation fins and substrates are extruded in an integrated manner. The substrate is thicker, and the heat dissipation fins are connected to the surface of the substrate, which is a complete thin sheet structure with a relatively thin thickness. In order to improve the heat dissipation effect of cooling air blowing to the heat dissipation fins, the industry has begun to set surface grooves on the heat dissipation fins or set through holes near the substrate.

[0003] At present, when using ordinary forming dies to extrude aluminum alloy heat sink fins, the aluminum alloy bar material directly enters the forming die that is consistent with the shape of the aluminum alloy heat sink fin. When the thickness of the forming die is large, the aluminum alloy heat sink fin stays in the forming die for a long time and can be fully extruded and extended. However, since the extrusion force increases with the thickness of the forming die, the extrusion energy consumption is increased, and the technical requirements of energy-saving production are not met. On the contrary, when the thickness of the forming die is small, the material cannot be fully extruded and extended, and it is easy to produce aluminum alloy heat sink fins with insufficient extrusion deformation, incomplete structure, and poor surface finish. The above shortcomings are more prominent for thinner heat sink fins; moreover, the extruded aluminum alloy heat sink fins directly enter the free state under high temperature and cannot be supported, and are prone to large deformation during the cooling process, which does not meet the product quality requirements.

[0004] In addition, the current extrusion technology can only produce heat sink fins with complete thin-film structures. If structures such as heat dissipation holes and heat dissipation grooves need to be processed, it is necessary to use other machining equipment. The surface grooves or middle through holes of the heat sink fins are processed by cutting and drilling on the surface of the extruded heat sink fins, which requires multiple clamping and has low production efficiency. Moreover, due to the thin thickness of the heat sink fins, the fins have poor supporting force without external support and cannot withstand the axial force of the above-mentioned cutting and drilling process, which is prone to distortion. Summary of the invention

[0005] Based on this, the present invention provides an extrusion die for aluminum alloy heat sink fins, which can fully extrude and extend the aluminum alloy bar material, and timely support the aluminum alloy heat sink fins extruded by the forming die, and process the grooves and through-hole structures of the heat sink fins under the support state, thereby improving the extrusion processing quality of the product and enabling the finished product to obtain good heat dissipation effect during use, and is particularly suitable for the extrusion processing of thinner aluminum alloy heat sink fins.

[0006] In order to achieve the above-mentioned purpose, the present invention provides an extrusion die for aluminum alloy heat dissipation fins, which is installed at the outlet end of an extruder, and includes a support seat, a pretreatment die, a forming die and a shaping die. The support seat is fixedly connected to the body of the extruder, and the pretreatment die is fixedly arranged at the front of the support seat, including a first die cavity that is axially penetrated and whose cross section gradually decreases along the processing direction, and the front end of the first die cavity is connected to the outlet of the extruder; the forming die is fixedly arranged in the middle of the support seat, including a second die cavity that is axially penetrated, and the front end of the second die cavity is connected to the rear end of the first die cavity, including a fin forming cavity that is adapted to the fin and a substrate forming cavity that is adapted to the substrate, and the bottom of the fin forming cavity is connected to the substrate forming cavity; the shaping die is fixedly arranged at the rear of the support seat, including a third die cavity that is axially penetrated and whose cross section is consistent along the processing direction, and the third die cavity is connected to the rear end of the second die cavity, including a fin shaping cavity that is adapted to the fin and a substrate shaping cavity that is adapted to the substrate, and the fin shaping cavity is connected to the substrate shaping cavity.

[0007] Furthermore, the front cross section of the first mold cavity is set as a round hole adapted to the bar material, the rear cross section is set as a rectangular hole adapted to the outer contour of the workpiece, and the middle part smoothly transitions from the round hole to the rectangular hole.

[0008] Furthermore, the first mold cavity is located inside the circular hole and is provided with a plurality of radial grooves arranged at intervals along the axial direction and staggered circumferentially. A scale scraper supported by a spring is slidably arranged in each of the radial grooves. The blade of each scale scraper is adapted to the circular contour of the rod material. The pretreatment mold is located between adjacent scale scrapers and is provided with a scale discharge port.

[0009] Furthermore, the cross-sectional width of each fin forming cavity of the second mold cavity gradually narrows along the processing direction, and the cross-sectional width near the rear end of each fin forming cavity is consistent with the fin width.

[0010] Furthermore, the base molding cavity of the third mold cavity is openly arranged at a side away from the fin molding cavity, and a plurality of support rollers are arranged in an array along the length direction at the bottom of the base molding cavity, and the bottom of the base entering the second mold cavity is supported by the support rollers, and each of the support rollers is provided with an axially penetrating central cooling hole, and a cooling air pipe is connected to one end of each of the central cooling holes to transport cooling air into the central cooling hole of the support roller to assist in heat dissipation of the support roller and the bottom of the base.

[0011] Furthermore, the shaping die is also provided with a transverse stamping cavity, which is arranged obliquely to the processing direction and communicates with the fin shaping cavity, and a stamping die adapted to the transverse stamping cavity is movably provided outside the shaping die.

[0012] Furthermore, the transverse stamping cavity includes a first stamping cavity arranged at the top of the forming die, and a plurality of the first stamping cavities are arranged in an array along the processing direction and pass through the top of the fin forming cavity. Each of the first stamping cavities is inclined at the same angle clockwise relative to the processing direction. A first stamping die is movably arranged outside the forming die, and the first stamping die moves along the first stamping cavity to process the groove on the top of the fin in the third die cavity.

[0013] Furthermore, the transverse stamping cavity includes a second stamping cavity arranged in the middle of the forming die, and a plurality of the second stamping cavities are arranged in an array along the processing direction and pass through the bottom of the fin forming cavity. Each of the second stamping cavities is inclined counterclockwise at the same angle relative to the processing direction. A second stamping die is movably arranged outside the forming die, and the second stamping die moves along the second stamping cavity to process the middle through hole of the fin in the third die cavity.

[0014] Furthermore, the bottom of the first stamping cavity and the top of the second stamping cavity are arranged vertically at intervals, and the forming die is located between adjacent fin forming parts and is provided with an axial cooling hole extending along the processing direction, and the axial cooling hole is arranged in the interval between the first stamping cavity and the second stamping cavity, and the cross-section of the axial cooling hole is a circular hole, and the top of the circular hole is connected to the bottom of the first stamping cavity, and the bottom is connected to the top of the second stamping cavity, and the forming die is located at the rear end of each axial cooling hole and is connected to a cooling air pipe, and the conveyed cooling air flows along the axial cooling hole for cooling and is discharged from the first stamping cavity and the second stamping cavity, so as to blow and discharge the stamping debris in the first stamping cavity and the second stamping cavity, and cool and dissipate the heat on the surface of the first stamping cavity and the second stamping cavity.

[0015] Furthermore, the transverse stamping cavity includes a plurality of third stamping cavities arranged at the bottom of the molding die and perpendicular to the processing direction. Each of the third stamping cavities is arranged in an array along the processing direction and is connected with the bottom of the substrate molding cavity. A third stamping die is movably arranged outside the molding die, and the third stamping die moves along the third stamping cavity to process the groove at the bottom of the substrate in the third die cavity.

[0016] The technical advantages of the extrusion die of the aluminum alloy heat sink fin provided by the present invention are at least reflected in:

[0017] 1. By setting a pretreatment die on the front side of the forming die, the aluminum alloy bar is first preliminarily extruded and deformed in the pretreatment die to obtain a blank consistent with the outer profile of the aluminum alloy heat sink fin, and then extruded through the forming die to obtain a finished heat sink fin. After the two steps of preliminary extrusion deformation and forming extrusion, the blank is fully extruded to obtain an aluminum alloy heat sink fin with good structural integrity, high surface finish and high dimensional accuracy, which is particularly suitable for the extrusion processing and production of thin aluminum alloy heat sink fins;

[0018] 2. By setting a shaping die at the rear side of the forming die, the aluminum alloy heat sink fins directly enter the shaping die after extrusion processing, and the fin shaping cavity of the shaping die supports the fin structure of the aluminum alloy heat sink fins, and the substrate shaping cavity supports the substrate, so as to avoid the problem that the fins are in a free state during the heat dissipation process and have large dimensional deformation due to lack of support, thereby improving the product structure quality and dimensional accuracy;

[0019] 3. After the forming die completes the processing of the aluminum alloy heat sink fins, the surface of the heat sink fins is cut and drilled in the finalizing die to form surface grooves or middle through holes. Since the finalizing die supports the aluminum alloy heat sink fins, it withstands the axial force of the above-mentioned cutting and drilling process, avoiding the distortion of the fin structure, and does not require multiple clamping, which is beneficial to improving production efficiency, so that the heat sink fins have good heat dissipation efficiency during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 3. It is a schematic diagram of the three-dimensional structure of an extrusion die of an aluminum alloy heat sink fin provided according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a disassembled state of an extrusion die of an aluminum alloy heat sink fin provided by an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of the three-dimensional structure of a pretreatment mold provided according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the three-dimensional structure of a forming mold provided according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of the three-dimensional structure of a shaping mold provided according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic diagram of the local structure of the shaping mold provided by an embodiment of the present invention after some structures are removed;

[0027] Figure 7 is a front view of a shaping die provided according to an embodiment of the present invention;

[0028] Figure 8 It is a three-dimensional structural schematic diagram of an aluminum alloy heat sink fin extruded by using the provided aluminum alloy heat sink fin extrusion die;

[0029] Fig. 9 It is a schematic diagram of the partial structure of an aluminum alloy heat sink fin extruded by using the provided aluminum alloy heat sink fin extrusion die.

[0030] Description of the accompanying drawings:

[0031] 1-Support seat;

[0032] 2-pretreatment mold, 21-first mold cavity, 22-oxidation skin scraper;

[0033] 3-forming mold, 31-second mold cavity, 311-fin forming cavity, 312-base forming cavity;

[0034] 4-forming die, 41-third die cavity, 411-fin forming cavity, 412-base forming cavity, 421-first stamping cavity, 422-first stamping die, 431-second stamping cavity, 432-second stamping die, 441-third stamping cavity, 442-third stamping die, 45-axial cooling hole, 46-support roller, 47-center cooling hole;

[0035] 5-workpiece, 51-fin, 52-base, 53-top groove, 54-middle through hole, 55-bottom groove.

[0036] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0037] At present, in the process of extruding aluminum alloy heat sink fins using ordinary forming dies, the aluminum alloy bar directly enters the forming die with the same shape as the aluminum alloy heat sink fins for a single forming, which easily leads to the problems of insufficient extrusion and extension of the material, insufficient extrusion deformation, and poor surface finish. The above shortcomings are more prominent for thinner heat sink fins, and the extruded aluminum alloy heat sink fins cannot be supported during the heat dissipation process after the extrusion process, and are prone to large deformation during the cooling process. Moreover, the extrusion process can only produce heat sink fins with a complete thin film structure. Subsequently, the surface grooves or middle through holes of the extruded heat sink fins are processed by cutting and drilling, which requires multiple clamping, has low production efficiency, and is prone to distortion and deformation.

[0038] To this end, the present invention provides an extrusion die for aluminum alloy heat sink fins, wherein a pretreatment die, a forming die and a shaping die are arranged on a support seat, wherein the pretreatment die performs pretreatment deformation on the aluminum alloy bar to obtain a blank having an outer profile size similar to that of the aluminum alloy heat sink fin, and then the shaping die extrudes the blank to obtain a heat sink fin forming structure, and finally heat is dissipated in a supported state in the shaping die, and heat sink grooves and heat sink holes are processed. By using this extrusion die, the aluminum alloy bar is fully extruded and extended, and the aluminum alloy heat sink fin extruded by the forming die is timely supported and supported, and the grooves and through-hole structures of the heat sink fins are processed in a supported and supported state, thereby improving the extrusion processing quality of the product, so that the finished product obtains a good heat sink effect during use, and is particularly suitable for the extrusion processing of thin aluminum alloy heat sink fins.

[0039] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, and the composition of the materials described in these embodiments are merely exemplary and not intended to be limiting.

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way serves as any limitation on the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments herein. The terms "first", "second", etc. that appear in the invention are only for the convenience of description to distinguish different components with the same name and do not indicate a sequential or primary-secondary relationship. In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. Example 1

[0041] The present invention provides an extrusion die for an aluminum alloy heat dissipating fin, which is installed at the outlet end of an extruder, and a support seat 1 is fixedly connected to the body of the extruder.

[0042] The pretreatment die 2 is fixedly arranged at the front of the support seat 1, and includes a first die cavity 21 that is axially through and has a cross section that gradually decreases along the processing direction. The front end of the first die cavity 21 is connected to the outlet of the extruder. In some implementation processes, the front end cross section of the first die cavity 21 is set as a circular hole that is adapted to the bar stock, and the rear end cross section is set as a rectangular hole that is adapted to the outer contour of the workpiece 5. The middle part smoothly transitions from the circular hole to the rectangular hole. In order to perform pretreatment processing of the heated aluminum alloy round bar to the blank that is adapted to the outer contour of the heat sink fin. Further, in order to prevent the oxide scale from being brought into the extrusion die with the bar stock, a plurality of radial slide grooves arranged along the axial interval and staggered circumferentially are arranged inside the circular hole of the first die cavity 21, and an oxide scale scraper 22 supported by a spring is slidably arranged in each of the radial slide grooves, and the blades of each of the oxide scale scrapers 22 are adapted to the circular contour of the bar stock, and the pretreatment die 2 is provided with an oxide scale discharge port between adjacent oxide scale scrapers 22.

[0043] The molding die 3 is fixedly arranged in the middle of the support seat 1, and includes a second mold cavity 31 which is axially penetrated, the front end of the second mold cavity 31 is connected to the rear end of the first mold cavity 21, and includes a fin molding cavity 311 adapted to the fin 51 and a base molding cavity 312 adapted to the base 52, and the bottom of the fin molding cavity 311 is connected to the base molding cavity 312. Preferably, the cross-sectional width of each fin molding cavity 311 of the second mold cavity 31 gradually narrows along the processing direction, and the cross-sectional area near the rear end of each fin molding cavity 311 is consistent with the width of the fin 51.

[0044] The molding die 4 is fixedly arranged at the rear of the support seat 1, and includes a third molding cavity 41 which is axially through and has a cross section consistent along the processing direction. The third molding cavity 41 is connected to the rear end of the second molding cavity 31, and includes a fin molding cavity 411 adapted to the fin 51 and a base molding cavity 412 adapted to the base 52. The fin molding cavity 411 is connected to the base molding cavity 412.

[0045] The processing process of using the extrusion die of the provided aluminum alloy heat sink fins is as follows:

[0046] The aluminum alloy bar material heated in the extruder is subjected to axial thrust, and is first preliminarily extruded and deformed in the pretreatment die 2 to obtain a blank consistent with the outer contour of the aluminum alloy heat sink fin, and then is extruded through the forming die 3 to obtain a finished heat sink fin. Then, the heat sink fin surface is cut and drilled in the shaping die 4 to form surface grooves or middle through holes. During the processing, the aluminum alloy heat sink fin is supported by the shaping die 4.

[0047] Through the extrusion die of the aluminum alloy heat sink fin, the aluminum alloy bar material is fully extruded after two steps of preliminary extrusion deformation and forming extrusion processing. After the extrusion processing, the aluminum alloy heat sink fin directly enters the shaping die 3. The fin shaping cavity 411 of the shaping die 3 supports the fin structure of the aluminum alloy heat sink fin, and the base shaping cavity 412 supports the base 52, so as to avoid the problem of large-size deformation of the fin 51. Example 2

[0048] On the basis of the first embodiment, the shaping mold is further optimized. Specifically, the base shaping cavity 412 of the third mold cavity 41 is openly arranged at a side away from the fin shaping cavity 411. A plurality of support rollers 46 are arranged in an array along the length direction at the bottom of the base shaping cavity 412. The bottom of the base 52 entering the second mold cavity 31 is supported by the support rollers 46. Each of the support rollers 46 is provided with an axially penetrating central cooling hole 47. A cooling air pipe is connected to one end of each of the central cooling holes 47 to transport cooling air into the central cooling hole 47 of the support roller 46 to assist in heat dissipation of the support roller 46 and the bottom of the base 52. It should be noted that the cooling air pipe is connected to one end of the roller shaft of the support roller through a sliding joint to accommodate the rotation of the support roller.

[0049] During the implementation process, the aluminum alloy fins located in the molding cavity can be ejected by the aluminum alloy heat sink fins produced subsequently, or a drive motor can be connected to the end of the support roller to rotate the support roller through the drive motor, and the aluminum alloy heat sink fins in the molding cavity can be moved outward by friction.

[0050] Based on this embodiment, after the extruded aluminum alloy heat sink fins enter the forming die 4, the bottom of the base 52 is supported by the support roller 46. As the aluminum alloy heat sink fins move in the die under the static friction between the inner wall of the die, there is rolling friction between the support roller 46 and the base 52 of the aluminum alloy heat sink, which reduces the resistance of the forward movement process and thus reduces energy consumption.

[0051] At the same time, the bottom of the third mold cavity 41 is open, and the base of the aluminum alloy heat dissipating fin is in the third mold cavity 41. The bottom is directly in contact with the air, which can improve the heat dissipation efficiency. Since the base thickness of the fin is large and the stored heat is large, the bottom of the base is exposed to the air and the heat is dissipated quickly, while the fin is located in the fin molding cavity and the heat is dissipated slowly, thereby achieving balanced heat dissipation between the two and preventing lateral bending problems caused by uneven heat dissipation. Example 3

[0052] On the basis of Embodiment 1 and Embodiment 2, further, the molding die 4 is also provided with a transverse stamping cavity, which is arranged obliquely to the processing direction and is connected with the fin molding cavity 411, and a stamping die adapted to the transverse stamping cavity is movably provided outside the molding die 4.

[0053] In some implementations, the transverse stamping cavity includes a first stamping cavity 421 disposed at the top of the molding die 4, and a plurality of the first stamping cavities 421 are arranged in an array along the processing direction and pass through the top of the fin molding cavity 411, and each of the first stamping cavities 421 is inclined at the same angle clockwise relative to the processing direction. A first stamping die 422 is movably disposed outside the molding die 3, and the first stamping die 422 moves along the first stamping cavity 421 to process the top groove 53 of the fin 51 in the third mold cavity 41.

[0054] In some implementations, the transverse stamping cavity includes a second stamping cavity 431 disposed in the middle of the molding die 4, and a plurality of the second stamping cavities 431 are arranged in an array along the processing direction and pass through the bottom of the fin molding cavity 411, and each of the second stamping cavities 431 is inclined counterclockwise at the same angle relative to the processing direction. A second stamping die 432 is movably disposed outside the molding die 3, and the second stamping die 432 moves along the second stamping cavity 431 to process the middle through hole 54 of the fin 51 in the third mold cavity 41.

[0055] In some implementation processes, the transverse stamping cavity includes a plurality of third stamping cavities 441 arranged at the bottom of the molding die 4 and perpendicular to the processing direction. Each of the third stamping cavities 441 is arranged in an array along the processing direction and is connected with the bottom of the substrate molding cavity 412. A third stamping die 442 is movably arranged outside the molding die 4. The third stamping die 442 moves along the third stamping cavity 441 to process the bottom groove 55 of the substrate 52 in the third mold cavity 41.

[0056] With the support of the fin molding cavity on the fin and the support of the base molding cavity on the base, the first stamping die 422 moves along the first stamping cavity 421 to process the top groove 53 of the fin 51, and moves along the second stamping cavity 431 through the second stamping die 432 to process the middle through hole 54 of the fin 51. The third stamping die 442 moves along the third stamping cavity 441 to process the bottom groove 55 of the base 52. The molding die withstands the axial force of the cutting and drilling process to avoid distortion of the fin structure. It is particularly suitable for the extrusion processing and production of thinner aluminum alloy heat sink fins. The entire production process does not require multiple clamping, which is beneficial to improving production efficiency, and the heat sink fins have good heat dissipation efficiency during use. Example 4

[0057] On the basis of the third embodiment, the structure of the forming mold is optimized. Specifically, the bottom of the first stamping cavity 421 and the top of the second stamping cavity 431 are arranged vertically at intervals, and the forming mold 4 is located between the forming parts of adjacent fins 51 and is provided with an axial cooling hole 45 extending along the processing direction. The axial cooling hole 45 is arranged in the interval between the first stamping cavity 421 and the second stamping cavity 431. The cross-section of the axial cooling hole 45 is a circular hole, and the top of the circular hole is connected to the bottom of the first stamping cavity 421, and the bottom is connected to the top of the second stamping cavity 431. Based on this embodiment, the axial cooling hole 45 is arranged between the adjacent fin forming cavities, and each of the first stamping cavity 421 and the second stamping cavity 431 is connected to the axial cooling hole 45.

[0058] The shaping die 4 is connected to a cooling air pipe at the rear end of each axial cooling hole 45, and the conveyed cooling air flows along the axial cooling hole 45 for cooling and is discharged from the first stamping cavity 421 and the second stamping cavity 431, so as to blow and discharge the stamping debris in the first stamping cavity 421 and the second stamping cavity 431, and cool and dissipate the surface of the first stamping cavity 421 and the second stamping cavity 431, thereby improving the cooling and dissipation efficiency of the fins, the first stamping cavity 421, and the second stamping cavity 431, and realizing rapid heat dissipation at the stamping processing point, and by blowing the first stamping cavity and the second stamping cavity with cooling air, the debris generated by the processing of the heat dissipation grooves and the heat dissipation through holes is quickly blown away, thereby preventing the processing debris from adhering to the surface of the fin processing point and scratching the surface of the aluminum alloy heat dissipation fin when moving outward, thereby improving the surface quality of the aluminum alloy heat dissipation fin.

[0059] Based on the above embodiments, an extrusion die for aluminum alloy heat sink fins is provided, the aluminum alloy bar material is fully extruded and extended, and the aluminum alloy heat sink fins extruded by the forming die are timely supported and supported, and the groove and through-hole structure of the heat sink fins are processed under the supported state to improve the extrusion processing quality of the product. The die is particularly suitable for the extrusion processing of thin aluminum alloy heat sink fins. The finished product has the characteristics of good structural integrity, high surface finish, high dimensional accuracy, etc., and the finished product obtains a good heat dissipation effect during use.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extrusion die for aluminum alloy heat sink fins, installed at the outlet end of an extruder, characterized in that: include: A support seat (1) is fixedly connected to a body of the extruder; a pre-processing die (2) is fixedly arranged in front of the support seat (1), and comprises a first die cavity (21) which is axially through and has a cross section that gradually decreases along a processing direction, wherein a front end of the first die cavity (21) is connected to an outlet of the extruder; The molding die (3) is fixedly arranged in the middle of the support seat (1), and comprises a second molding cavity (31) which is axially penetrated, the front end of the second molding cavity (31) is connected to the rear end of the first molding cavity (21), and comprises a fin molding cavity (311) adapted to the fin (51) and a base molding cavity (312) adapted to the base (52), the bottom of the fin molding cavity (311) is connected to the base molding cavity (312); and The shaping die (4) is fixedly arranged at the rear of the support seat (1), and comprises a third die cavity (41) which is axially penetrated and has a cross section consistent with the processing direction. The third die cavity (41) is connected to the rear end of the second die cavity (31), and comprises a fin shaping cavity (411) adapted to the fin (51) and a base shaping cavity (412) adapted to the base (52). The fin shaping cavity (411) is communicated with the base shaping cavity (412). The shaping die (4) is also provided with a transverse stamping cavity, which is arranged obliquely to the processing direction and is communicated with the fin shaping cavity (411). A stamping die adapted to the transverse stamping cavity is movably arranged outside the shaping die (4); The base molding cavity (412) of the third mold cavity (41) is openly arranged at a side away from the fin molding cavity (411), and a plurality of support rollers (46) are arranged in an array along the length direction at the bottom of the base molding cavity (412); the bottom of the base (52) entering the second mold cavity (31) is supported by the support rollers (46), and each of the support rollers (46) is provided with an axially penetrating central cooling hole (47); a cooling air pipe is connected to one end of each of the central cooling holes (47) to transport cooling air into the central cooling hole (47) of the support roller (46) to assist in heat dissipation of the support roller (46) and the bottom of the base (52); The transverse punching cavity comprises a first punching cavity (421) arranged at the top of the shaping die (4); a plurality of the first punching cavities (421) are arranged in an array along the processing direction and are connected along the top of the fin shaping cavity (411); each of the first punching cavities (421) is inclined clockwise at the same angle relative to the processing direction; a first punching die (422) is movably arranged outside the shaping die (3); the first punching die (422) moves along the first punching cavity (421) to process the top groove (53) of the fin (51) in the third die cavity (41); The transverse punching cavity comprises a second punching cavity (431) arranged in the middle of the shaping die (4); a plurality of the second punching cavities (431) are arranged in an array along the processing direction and are connected along the bottom of the fin shaping cavity (411); each of the second punching cavities (431) is tilted counterclockwise at the same angle relative to the processing direction; a second punching die (432) is movably arranged outside the forming die (3); the second punching die (432) moves along the second punching cavity (431) to process the middle through hole (54) of the fin (51) in the third die cavity (41); The bottom of the first stamping cavity (421) and the top of the second stamping cavity (431) are arranged vertically spaced apart, and the shaping die (4) is provided with an axial cooling hole (45) extending along the processing direction between the shaping portions of adjacent fins (51), and the axial cooling hole (45) is arranged in the space between the first stamping cavity (421) and the second stamping cavity (431), and the cross section of the axial cooling hole (45) is a circular hole, and the top of the circular hole is connected to the bottom of the first stamping cavity (421). , the bottom is connected to the top of the second stamping cavity (431), the shaping die (4) is connected to a cooling air pipe at the rear end of each axial cooling hole (45), the conveyed cooling air flows along the axial cooling hole (45) for cooling and is discharged from the first stamping cavity (421) and the second stamping cavity (431), the stamping debris in the first stamping cavity (421) and the second stamping cavity (431) are purged and discharged, and the surfaces of the first stamping cavity (421) and the second stamping cavity (431) are cooled and dissipated; The transverse punching cavity comprises a plurality of third punching cavities (441) arranged at the bottom of the shaping die (4) and perpendicular to the processing direction. The third punching cavities (441) are arranged in an array along the processing direction and are connected to the bottom of the substrate shaping cavity (412). A third punching die (442) is movably arranged outside the shaping die (4). The third punching die (442) moves along the third punching cavity (441) to process the bottom groove (55) of the substrate (52) in the third die cavity (41).

2. The extrusion die of the aluminum alloy heat sink fin according to claim 1, characterized in that: The front cross section of the first mold cavity (21) is configured as a round hole adapted to the bar material, the rear cross section is configured as a rectangular hole adapted to the outer contour, and the middle portion smoothly transitions from the round hole to the rectangular hole.

3. The extrusion die of the aluminum alloy heat sink fin according to claim 2, characterized in that: The first mold cavity (21) is provided with a plurality of radial grooves arranged at intervals along the axial direction and staggered in the circumferential direction inside the circular hole, and a scale scraper (22) supported by a spring is slidably arranged in each of the radial grooves, and the blade of each scale scraper (22) is adapted to the circular contour of the bar material, and the pretreatment mold (2) is provided with a scale discharge port between adjacent scale scrapers (22).

4. The extrusion die of the aluminum alloy heat sink fin according to claim 1, characterized in that: The cross-sectional width of each fin forming cavity (311) of the second mold cavity (31) gradually narrows along the processing direction, and the cross-sectional width near the rear end of each fin forming cavity (311) is consistent with the width of the fin (51).

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