One-piece finned heat sink formed by bending and manufacturing method

Abstract

This invention aims to reduce manufacturing costs by proposing a heat sink for electronic devices and a manufacturing method thereof. The outer edge ribs (1) and the base plate (2) of the heat sink are integral structures made of the same metal plate, and a bending and erecting structure is adopted between the outer edge ribs (1) and the base plate (2); the outer edge ribs (1) have radial folds (13), forming a distance t between two adjacent outer edge ribs. The manufacturing method of this invention is characterized by the fact that the bending and erecting station of the outer edge ribs (1) is located after the cutting station of the radial cutting edge (12) of the outer edge ribs (1).

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation technology for electronic devices, and specifically relates to a heat sink made of metal plates through cutting and bending, and its manufacturing method. Technical Background

[0002] Electronic devices (such as integrated circuit chips, LED light sources, and power switching transistors (SCRs, transistors, IGBTs, etc.) generate heat during operation, which is typically dissipated using heat sinks to reduce temperature and ensure normal operation. The technology disclosed in Chinese invention patent application (application number: 2014100666506) uses a metal sheet through a stretching process to create a housing. Ventilation windows (louvered or staggered) are opened on the side walls of the housing, forming a heat sink for the LED light source, thus saving material costs. However, the stretching process for the housing involves multiple forming stations, resulting in high processing costs and mold costs. The ventilation windows on the side walls also lead to complex mold structures, high costs, and low processing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a heat sink with a simpler mold structure, fewer molding stations, and lower manufacturing cost, as well as a method for manufacturing the same.

[0004] The heat sink technology of this invention for electronic devices comprises: an outer edge rib and a base plate, wherein the outer edge rib and the base plate are an integral structure made of the same metal plate; the outer edge rib is located on the outer edge of the base plate, and heat from the electronic device is transferred to the outer edge rib through the base plate. The invention features: a bent and erected structure is adopted between the outer edge rib and the base plate; the outer edge rib has radially folded edges with radial lines, and when the outer edge rib is bent and erected, a gap is formed between two adjacent outer edge ribs. The heat sink of this invention is particularly suitable for natural convection heat dissipation.

[0005] The bending and erecting structure described in this invention is defined as follows: after the radial edge (i.e., side edge) and top edge of the outer edge rib are cut open, it is bent and erected, and the top plates of the two adjacent outer edge ribs are cut apart.

[0006] The method for manufacturing a heat sink for electronic devices according to the present invention is characterized in that: the bending and erecting forming station of the outer edge ribs is located after the cutting station of the radial slitting edge of the outer edge ribs. The bending station of the radial folding edge should also be located before the bending and erecting forming station of the outer edge ribs, but is not limited thereto. Attached Figure Description

[0007] The embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0008] Figure 1This is a schematic diagram showing the characteristics of the heat sink sheet before the ribs of the present invention are bent and erected.

[0009] Figure 2 yes Figure 1 A schematic diagram showing the characteristics of the outer edge ribs before they are bent and erected after radial folding and forming.

[0010] Figure 3 yes Figure 2 A magnified schematic diagram of the local feature profile at point AA.

[0011] Figure 4 yes Figure 1 as well as Figure 2 The diagram shows a characteristic feature of the heat sink of the present invention, formed by bending and erecting the outer edge ribs of the sheet material.

[0012] Figure 5 yes Figure 4 The diagram shows a cross-sectional feature of an axis.

[0013] Figure 6 This is a schematic diagram showing the characteristics of the heat sink sheet before the outer edge ribs of the present invention are bent and erected.

[0014] Figure 7 yes Figure 6 The diagram shows a characteristic feature of the heat sink of the present invention, formed by bending and erecting the outer edge ribs of the sheet material.

[0015] Figure 8 yes Figure 7 The diagram shows a cross-sectional feature of an axis.

[0016] Figure 9 This is a schematic diagram showing the characteristics of the heat sink sheet before the outer edge ribs of the present invention are bent and erected.

[0017] Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the heat sink of the present invention after the outer edge ribs are bent and erected, with an annular fastener 3 added.

[0018] Figure 10-1 yes Figure 10 A magnified view of part A in the middle.

[0019] Figure 11 This is a schematic diagram of the axial cross-sectional features of the heat sink of the present invention.

[0020] Figure 11-1 yes Figure 11 A magnified view of part B in the middle.

[0021] Figure 12This is a schematic diagram illustrating the features of the heat sink of this invention.

[0022] Figure 13 yes Figure 12 The diagram shows a schematic cross-sectional feature of the heat sink axis of the present invention.

[0023] Figure 13-1 yes Figure 13 A magnified view of a portion of C.

[0024] Figure 14 This is a schematic diagram of the axial cross-sectional features of the heat sink of the present invention.

[0025] Figure 14-1 yes Figure 14 A magnified view of a portion of D.

[0026] Figure 15 This is a schematic diagram of the axial cross-sectional features of the heat sink of the present invention.

[0027] Figure 15-1 yes Figure 15 A magnified view of a portion of E.

[0028] Figure 16-18 These are schematic diagrams showing the axial cross-sectional features of the heat sink of the present invention in three different ways.

[0029] Figure 19 This is a schematic diagram illustrating the features of the heat sink of this invention.

[0030] Figure 19-1 yes Figure 19 A magnified schematic diagram of the local feature profile at point BB.

[0031] Figure 20 and Figure 21 These are schematic diagrams illustrating the features of two types of heat sinks according to the present invention.

[0032] In the diagram: 1. Outer edge rib, 11. Radial fold line, 12. Radial slit edge, 13. Radial fold edge, 14. Outer rib root fold line, 15. Outer rib root bend, 16. Buckle hole, 17. Notch, 18. Buckle, 19. Step structure, 120. Fastener, 122. Buckle, 122. Buckle hole, 130. Upper folded ear, 2. Base plate, 21. Inner hole, 3. Ring fastener, 31. Buckle, 32. Folded ear, 33. Buckle hole, 34. Flanged edge, 4. Top cover, 41. Flanged edge, 5. Inner edge rib, 51. Inner rib slit line, 52. Inner rib root fold line, 6. Screw. Detailed Implementation Plan

[0033] Figure 1-5 The heat sink of the present invention shown has outer edge ribs 1 located at the outer edge of the base plate 2. Figure 1This is a schematic diagram showing the characteristics of the heat sink sheet when it is unfolded, before the outer edge rib 1 is bent and erected, and the radial fold 13 is not bent and formed. The outer edge rib 1 and the base plate 2 are the same metal plate. Figure 1 As shown, the radial cutting edges 12 of two adjacent outer edge ribs are separated (i.e., not on the same cutting line), and the top sheet metal of the two adjacent outer edge ribs is cut apart. Figure 1 It also shows the radial fold line 11 (i.e., the fold line at the bend of the radial fold edge 13, shown by the dashed line in the figure) and the radial cutting edge 12, which is in the radial direction. The radial fold edge 13, after being bent and formed, is also in the radial direction (e.g., Figure 2 (As shown). Figure 2 The radial fold 13 shown is bent vertically, but it does not necessarily have to be designed to be bent vertically.

[0034] Figure 2 The diagram shows a radial fold 13 extending toward the fold line 14 near the outer rib root, where the fold line 14 represents the fold line at the bend of the outer rib root 15. Figure 5 The dashed lines represent the outer edge rib 1 before it is bent and erected, and the arrows represent the bending and erection process of the outer edge rib 1. Figure 5 The figure shown is vertically erected, but it does not necessarily have to be vertically erected. After the outer edge ribs are bent and erected, because the outer edge ribs 1 adopt a radial folded edge 13 structure, there is a gap between adjacent outer edge ribs 1. Figure 4 In this context, t represents the distance between the bends of the radial folds 13 of two adjacent outer edge ribs 1. Figure 4 and Figure 5 The radial fold 13 is shown to be radially inward.

[0035] Depend on Figure 1-5 The manufacturing process of the heat sink of the present invention is as follows: the bending and erecting station of the outer edge rib 1 is located after the cutting station of the radial cutting edge 12 of the outer edge rib 1 and the bending station of the radial folding edge 13. That is, after the radial cutting edge 12 of the outer edge rib 1 is cut and the radial folding edge 13 is bent and formed, the outer edge rib 1 is bent and erected again.

[0036] The tops of the two outer edge ribs of the present invention are cut apart, and the upper part of the outer edge rib 1 should be provided with a mechanism for interconnecting ribs so that the top size of the outer edge rib 1 is limited and not easily deformed (mainly in the radial direction).

[0037] Figure 6-8 The heat sink of the present invention shown is... Figure 1-5 The differences shown are: Figure 6-8 The radial cutting edges (12) of the two adjacent outer edge ribs shown adopt the same cutting edge structure; the radial fold 13 is radially outward.

[0038] Figure 9-10 The heat sink of the present invention shown is... Figure 6-8The differences shown are: (1) The base plate 2 is provided with an inner hole 21 and an inner edge rib 5 is provided; (2) The upper part of the outer edge rib 1 is provided with a mechanism of interconnecting ribs.

[0039] Figure 9-10 As shown, the material of the inner edge rib 5 is taken from the sheet metal of the inner hole 21 of the base plate 5, that is, the inner edge rib 5 and the base plate 2 are an integral structure made of the same metal sheet; the inner edge rib 5 is located on the inner edge of the base plate 2, and the inner edge rib 5 and the base plate 2 adopt a bent and erected structure, and the inner edge ribs adopt a structure in which one side is staggered inward and the other side is staggered outward (as shown by the inner rib root fold line 52 in the figure).

[0040] Figure 9-10 The mechanism of the interconnecting ribs on the upper part of the outer edge rib 1 shown adopts a ring fastener 3. The ring fastener 3 has a buckle 31, and the outer edge rib 1 has a buckle hole 16 corresponding to the buckle 31. The buckle 31 is fastened into the buckle hole 16. The buckle 31 shown in the figure adopts a hook structure. The buckle 31 can also be designed as a structure without a hook.

[0041] Figure 11 The heat sink of the present invention shown is... Figure 10 The differences shown are: there is a buckle 18 on the outer edge rib 1, which is punched out from the sheet material of the outer edge rib 1. That is, the buckle 18 and the outer edge rib 1 are made of the same metal sheet and are an integral structure. The buckle 18 fastens the ring fastener 3.

[0042] Figure 12-13 The heat sink of the present invention shown is... Figure 6-8 The differences shown are: (1) Two radial flanges 13 on the outer edge rib 1, one facing inward and the other facing outward; (2) A mechanism of interconnecting ribs is provided on the upper part of the outer edge rib 1.

[0043] Figure 12-13 As shown, the interconnecting mechanism of the upper part of the outer edge rib 1 uses a ring fastener 3. The outer edge rib 1 (in the figure, the radial fold 13) has a recessed notch 17 that matches the ring fastener 3. The figure shows the ring fastener 3 being inserted into the recessed notch 17. The recessed notch 17 should be designed in a hook shape (as shown in the figure).

[0044] Figure 14 The heat sink of the present invention shown has an interconnecting rib mechanism on the upper part of the outer edge rib 1 using a ring fastener 3. A stepped structure 19 is used on the outer edge rib 1 (on the radial fold 13 in the figure) to match the ring fastener 3, restricting the upward movement of the ring fastener 3. The stepped structure 17 should be designed as a hook shape (as shown in the figure).

[0045] The outer edge rib 1 adopts a stepped structure, and the matching annular fastener 3 should be provided with no less than two screw holes or bolt holes. These screw holes or bolt holes can be matched with the component set on the top of the heat sink to fix the component, and at the same time, the top of the outer edge rib is also stabilized. Figure 13 The heat sink of the present invention shown may also have at least two screw holes or bolt holes on the annular fastener 3.

[0046] Figure 15 The heat sink of the present invention shown has an interconnection mechanism for the upper part of the outer edge rib 1. The annular fastener 3 is an annular cover set on the top of the outer edge rib 1 with a fastening hole 33. The outer edge rib 1 has a fastener 18. The fastening hole 33 on the annular fastener 3 matches the fastener 18. As shown in the figure, the fastener 18 is inserted into the fastening hole 33 and then bent into a hook shape.

[0047] Figure 16-18 The heat sink of the present invention shown has an upper fold 130 on the upper part of the outer edge rib 1. The upper fold 130 has a buckle hole 16. The material of the upper fold 130 is the same as that of the outer edge rib 1. That is, the upper fold 130 and the outer edge rib 1 are made of the same metal plate and are an integral structure.

[0048] Figure 16 The mechanism of the interconnecting ribs on the upper part of the outer edge rib 1 shown is similar to... Figure 15 Similar to, but different in that: the ring fastener 3 has a buckle 31 that matches the buckle hole 16. The buckle 31 shown in the figure adopts a hook-type buckle structure, but the buckle 31 can also be designed as a structure without a hook.

[0049] Figure 17 and Figure 18 The heat sink of the present invention shown has a top cover 4 and screws 6. The buckle hole 16 on the upper folding lug 130 matches the screw 6 to form a screw hole. Of course, it can also be made using Figure 16 The connection structure shown (hook and hole structure) uses screw connections, which is not suitable for each outer edge rib to have a screw. To achieve a mechanism that connects the interconnecting ribs on the upper part of the outer edge rib 1 using a limited number of screws, the upper cover 4 should have a structure that limits the outer edge ribs, for example... Figure 18 The flange in the middle is 41. Figure 17 The outer edge rib 1 is inclined inward and bent upright.

[0050] Figure 19The heat sink of the present invention, as shown, employs a mechanism for interconnecting the upper ribs of the outer edge rib 1. The radial flange 13 on the upper part of the outer edge rib 1 has fasteners 120 extending towards the adjacent outer edge rib, and directly engaging with the adjacent outer edge rib. As shown in the figure, the fastener 120 has a fastening hole 122, and the radial flange 13 on the upper part of the adjacent outer edge rib has a fastener 121. The fastener 121 is inserted into the fastening hole 122. As shown in the figure, the fastener 121 is inserted into the fastening hole 122 and then bent into a hook shape.

[0051] Figure 20 The heat sink of the present invention shown has two radial folds 13 of the outer edge rib 1 in a V shape. Figure 21 The heat sink of the present invention shown has an outer edge rib 1 with only a single-sided radial fold 13.

[0052] Figure 1-21 The heat sinks shown in this invention are all circular structures. However, the heat sinks of this invention are not limited to circular shapes; they can also be elliptical, triangular, quadrilateral, or other polygonal shapes.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat sink for an electronic device, comprising an outer edge rib (1) and a base plate (2), wherein the outer edge rib (1) and the base plate (2) are integral structures made of the same metal plate, and the outer edge rib (1) is located at the outer edge of the base plate (2), characterized in that: The outer edge rib (1) and the base plate (2) adopt a bent and erected structure; the outer edge rib (1) has a radial fold (13), and near the outer rib root fold line (14), the radial fold line (11) bends toward the radial cutting edge (12).

2. The heat sink according to claim 1, characterized in that: The radial cutting edges (12) of two adjacent outer edge ribs adopt the same cutting line structure.

3. The heat sink according to claim 1, characterized in that: The radial fold (13) adopts an outward folding structure.

4. The heat sink according to claim 1, characterized in that: The radial fold line (11) of the radial fold (13) extends to the root of the outer edge rib (1).

5. The heat sink according to claim 1, characterized in that: The inner edge rib (5) is provided. The inner edge rib (5) and the base plate (2) are an integral structure made of the same metal plate. The inner edge rib (5) is located on the inner edge of the base plate (2). The inner edge rib (5) and the base plate (2) adopt a bent and erected structure.

6. The heat sink according to claim 1, 2, 3, 4, or 5, characterized in that: The upper part of the outer edge rib (1) is provided with a mechanism for interconnecting ribs.

7. The heat sink according to claim 6, characterized in that: The interconnecting rib mechanism employs a ring-shaped fastener (3). The outer edge rib (1) has a buckle (18), which is an integral structure made of the same metal plate as the outer edge rib (1). Alternatively, the ring fastener (3) has a buckle (31), and the outer edge rib (1) has a buckle hole (16) corresponding to the buckle (31). Alternatively, the outer edge rib (1) may have a stepped structure (19) that restricts the upward movement of the ring fastener (3), or the outer edge rib (1) may have a recessed notch (17) that matches the ring fastener (3).

8. The heat sink according to claim 6, characterized in that: The interconnecting rib mechanism employs a method in which the radial fold (13) on the upper part of the outer edge rib (1) has a fastener (120) extending to the adjacent outer edge rib, and has a fastening structure directly connected to the adjacent outer edge rib.

9. The heat sink according to claim 1, 2, 3, 4, or 5, characterized in that: The upper part of the outer edge rib (1) has an upper folding lug (130), and the upper folding lug (130) has a buckle hole (16). The upper folding lug (130) and the outer edge rib (1) are made of the same metal plate in an integrated structure.

10. A method for manufacturing a heat sink for an electronic device, the heat sink comprising an outer edge rib (1) and a base plate (2), the outer edge rib (1) and the base plate (2) being an integral structure made of the same metal plate, the outer edge rib (1) being located on the outer edge of the base plate (2), the outer edge rib (1) and the base plate (2) being formed by bending and erection, the outer edge rib (1) having a radial folded edge (13), near the fold line (14) of the outer rib root, the radial fold line (11) bending towards the radial cutting edge (12), after the outer edge rib (1) is bent and erected, a gap is formed between two adjacent outer edge ribs, characterized in that: The bending and erecting station of the outer edge rib (1) is located after the cutting station of the radial cutting edge (12) of the outer edge rib (1).

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