Heat sink structure and method for manufacturing the same

Abstract

Provided is a heat sink structure capable of greatly reducing production time and manufacturing costs by minimizing the thickness and spacing of a plurality of heat dissipation fin portions to improve heat dissipation performance, greatly reducing the weight, and manufacturing only the heat sink main body portion by casting. 【Solution means】A plurality of heat dissipation fin portions having a heat dissipation effect are fixed by laser welding to the heat dissipation surface of the heat sink main body portion of the heat sink structure.

Description

Technical Field

[0001] The present invention relates to a heat sink structure and a manufacturing method thereof (HEAT SINK STRUCTURE AND MANUFACTURING METHOD THEREOF), and more particularly, to a heat sink structure in which heat dissipation fins are joined to a heat sink body by laser welding and a manufacturing method thereof.

Background Art

[0002] Generally, a heat sink is provided in a product that requires heat dissipation so that heat can be effectively dissipated.

[0003] The heat sink is applied to various products in the electronics, machinery, and automotive industries, such as LED lighting, semiconductor manufacturing equipment, computers, medical devices, and radioactive application machines, to prevent damage caused by heat, enable stable operation, and be deformed into various forms suitable for the products.

[0004] Normally, the heat sink has a structure in which a plurality of heat dissipation fins are provided on the opposite side of the mounting surface in a heat sink body having a mounting surface on which a product that requires heat dissipation is mounted, and the heat generated in the product is quickly dissipated by heat exchange between the heat dissipation fins and air.

[0005] Korean Registered Patent Publication No. 10-0381303 (Publication date: April 26, 2003) (hereinafter referred to as "Prior Art") discloses a "porous heat sink".

[0006] The heat sink of the prior art is manufactured by extrusion or casting and has a structure in which a heat dissipation plate, which is the heat sink body, and the plurality of heat dissipation fins are integrally formed.

[0007] However, since the heat sink of the prior art is manufactured by extrusion or casting and the heat dissipation plate and the plurality of heat dissipation fins are integrally formed, it is difficult to reduce the thickness and the interval of the plurality of heat dissipation fins, and the number of the plurality of heat dissipation fins formed is small, so there are problems that the heat dissipation performance is limited and it is difficult to reduce the weight.

[0008] Further, since the heat sink of the prior art is manufactured by extrusion or casting, a mold is designed complicatedly to form the plurality of heat dissipation fins. As a result, the manufacturing cost is high, and the mold has to be manufactured separately in a form suitable for each product. Therefore, it takes a lot of time for the design and manufacture of the mold, and there is a problem that the defective rate during manufacturing is high.

Summary of the Invention

Problems to be Solved by the Invention

[0009] A technical problem of the present invention is to provide a heat sink structure and a manufacturing method thereof that can minimize the thickness and the interval of the plurality of heat dissipation fin parts and can greatly reduce the manufacturing cost by separately manufacturing the heat sink main body part and the plurality of heat dissipation fin parts and then fixing the plurality of heat dissipation fin parts to the heat sink main body part by laser welding.

[0010] The technical problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Means for Solving the Problems

[0011] In order to achieve the above problems, a heat sink structure according to the present invention includes a heat sink main body part and a plurality of heat dissipation fin parts. On one surface of the heat sink main body part, a mounting surface on which a product to be heat-dissipated is located is provided. On a surface different from the one surface of the heat sink main body part, a heat dissipation surface for releasing heat is provided. The plurality of heat dissipation fin parts are erected on the heat dissipation surface of the heat sink main body part and fixed by laser welding.

[0012] A plurality of welding joints may be formed to protrude on the heat dissipation surface of the heat sink main body. The plurality of heat dissipation fin parts can be respectively joined to the plurality of welding joints by laser welding.

[0013] Each of the plurality of welding joints may be constituted by a first heat dissipation fin support part. The first heat dissipation fin support part may be formed to protrude on the heat dissipation surface. The lower end part of each of the plurality of heat dissipation fin parts may be erected on the heat dissipation surface on one side of the first heat dissipation fin support part. The first heat dissipation fin support part can support one side of each of the plurality of heat dissipation fin parts. The space between one side of each of the plurality of heat dissipation fin parts and one side of the first heat dissipation fin support part can be fixed by laser welding.

[0014] Each of the plurality of welding joints may be constituted by a first heat dissipation fin support part and a second heat dissipation fin support part. The first heat dissipation fin support part may be formed to protrude on the heat dissipation surface. The second heat dissipation fin support part may be formed to protrude on the heat dissipation surface, separated from the first heat dissipation fin support part. The lower end part of each of the plurality of heat dissipation fin parts may be inserted between the first heat dissipation fin support part and the second heat dissipation fin support part and erected on the heat dissipation surface. The first heat dissipation fin support part can support one side of each of the plurality of heat dissipation fin parts. The second heat dissipation fin support part can support the other side of each of the plurality of heat dissipation fin parts. One of the space between one side of each of the plurality of heat dissipation fin parts and one side of the first heat dissipation fin support part and the space between the other side of each of the plurality of heat dissipation fin parts and one side of the second heat dissipation fin support part can be fixed by laser welding.

[0015] Each of the plurality of welding joints may be constituted by a support block part. The support block part may be formed to protrude on the heat dissipation surface. The lower end part of each of the plurality of heat dissipation fin parts may be erected on the support block part and fixed to the support block part by laser welding.

[0016] Each of the plurality of welded joints may be composed of a support block portion, a first heat dissipation fin support portion, and a second heat dissipation fin support portion. The support block portion may be formed to protrude on the heat dissipation surface. The first heat dissipation fin support portion may be formed to protrude at one end on the support block portion. The second heat dissipation fin support portion may be formed to protrude at the other end on the support block portion, spaced apart from the first heat dissipation fin support portion. The lower end of each of the plurality of heat dissipation fin portions may be inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and stood on the support block portion. The first heat dissipation fin support portion can support one side of each of the plurality of heat dissipation fin portions. The second heat dissipation fin support portion can support the other side of each of the plurality of heat dissipation fin portions. One of the space between one side of each of the plurality of heat dissipation fin portions and one side of the first heat dissipation fin support portion and the space between the other side of each of the plurality of heat dissipation fin portions and one side of the second heat dissipation fin support portion can be fixed by laser welding.

[0017] The thickness of the first heat dissipation fin support portion may be formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions.

[0018] The height of the first heat dissipation fin support portion may be formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

[0019] The thickness of the second heat dissipation fin support portion may be formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions.

[0020] The height of the second heat dissipation fin support portion may be formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

[0021] The thickness of the support block portion may be formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

[0022] Each of the plurality of heat dissipation fin portions may be composed of a plate support member and a heat dissipation fin member. The heat dissipation fin member may be erected and arranged at at least one of both ends of the plate support member.

[0023] The heat dissipation fin member may be composed of vertical fins. The vertical fins may be arranged perpendicular to the plate support member at at least one of both ends of the plate support member.

[0024] The heat dissipation fin member may be composed of inclined fins formed at both ends of the plate support member. The inclined fins formed at both ends of the plate support member may be inclined so that the distance between them becomes farther as they are farther from the plate support member.

[0025] The heat dissipation fin member may further be configured with vertical fins extending perpendicularly to the plate support member from the ends of the inclined fins formed at both ends of the plate support member.

[0026] In order to achieve the above problems, the manufacturing method of the heat sink structure according to the present invention is composed of a preparation step and a laser welding step. In the preparation step, the heat sink main body portion and the plurality of heat dissipation fin portions are manufactured separately. On one surface of the heat sink main body portion, a mounting surface on which a product to be heat-dissipated is located is provided. On a surface different from the one surface of the heat sink main body portion, a heat dissipation surface for releasing heat is provided. The plurality of heat dissipation fin portions have a heat dissipation effect. In the laser welding step, the plurality of heat dissipation fin portions are fixed to the heat dissipation surface of the heat sink main body portion by laser welding while being separated from each other.

[0027] In the preparation step, the heat sink main body portion can be manufactured by casting, and the plurality of heat dissipation fin portions can be manufactured by cutting a pre-manufactured metal plate.

[0028] In the preparation step, a plurality of welding joints may be formed to protrude from the heat dissipation surface of the heat sink main body. In the laser welding step, the plurality of heat dissipation fin portions can be respectively joined to the plurality of welding joints by laser welding.

[0029] In addition, specific matters of the embodiments are included in the detailed description and the drawings.

Effects of the Invention

[0030] In the present invention, after separately manufacturing the heat sink main body and the plurality of heat dissipation fin portions, the plurality of heat dissipation fin portions are fixed to the heat sink main body by laser welding, thereby minimizing the thickness and the interval of the plurality of heat dissipation fin portions, improving the heat dissipation performance, and significantly reducing the weight.

[0031] In addition, in the present invention, by manufacturing only the heat sink main body by casting, the production time required and the manufacturing cost can be significantly reduced.

[0032] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0034] The present invention can be subject to various modifications and can have various embodiments, but specific embodiments are illustrated in the drawings and described in detail.

[0035] However, this is not intended to limit the present invention to specific embodiments, and it must be understood that it includes all modifications, equivalents, or alternatives included in the spirit and technical scope of the present invention. Similar reference numerals are used for similar components when explaining each drawing.

[0036] When a component is referred to as being "connected" or "coupled" to another component, it should be understood that it may be directly connected or connected to the other component, but there may also be other components in between. In contrast, when a component is referred to as being "directly connected" or "directly coupled" to another component, it should be understood that there are no other components in between.

[0037] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "including" or "having" are intended to specify the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should be understood that the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

[0038] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. Hereinafter, the same reference numerals will be used for the same components in the drawings, and duplicate descriptions of the same components will be omitted.

[0039] FIG. 1 is a bottom perspective view showing an embodiment of a heat sink structure according to the present invention, FIG. 2 is a top perspective view showing an embodiment of a heat sink structure according to the present invention, FIG. 3 is a side view showing an embodiment of a heat sink structure according to the present invention, and FIGS. 4 and 5 are enlarged views showing a part of an embodiment of a heat sink structure according to the present invention.

[0040] More specifically, FIG. 4 is a view showing an example in which a heat dissipation fin portion 200 is coupled to a heat sink main body portion 100 before laser welding, and FIG. 5 is a view showing an example in which the heat dissipation fin portion 200 is fixed to the heat sink main body portion 100 after laser welding.

[0041] With reference to FIGS. 1 to 5, an embodiment of a heat sink structure 1 according to the present invention will be described in detail below.

[0042] An embodiment of a heat sink structure 1 according to the present invention includes a heat sink main body portion 100 provided with a mounting surface 101 on which a product to be heat-dissipated is located on one surface.

[0043] In this embodiment, an accommodation space 105 for accommodating the product can be formed on the mounting surface 101 of the heat sink main body 100. However, the heat sink main body 100 may be formed in a plate shape without the accommodation space 105 being formed.

[0044] On the other surface of the heat sink main body 100, there is a heat dissipation surface 102 where a plurality of heat dissipation fin parts 200 that dissipate heat by heat exchange are fixed.

[0045] In the heat sink main body 100, as an example, the heat dissipation surface 102 is the opposite surface of the mounting surface 101. In addition, it may be changed to a surface different from the mounting surface 101 depending on the design of the product.

[0046] As an example, the heat dissipation fin part 200 has a shape of a linear panel. In addition, it can be manufactured in various shapes such as a bent panel shape or a rod shape.

[0047] As an example, the heat sink main body 100 and the heat dissipation fin part 200 are manufactured from an aluminum material or an aluminum alloy material. In addition, they can be manufactured in various ways using known materials with excellent heat conduction for manufacturing the heat sink.

[0048] And, as an example, the heat sink main body 100 is manufactured in a form pre-designed by casting, and the heat dissipation fin part 200 is manufactured by cutting a pre-manufactured aluminum or aluminum alloy panel to a pre-designed size.

[0049] The heat dissipation fin part 200 is positioned so as to be erected and placed on the heat dissipation surface 102 of the heat sink main body 100, and is fixed on the heat dissipation surface 102 of the heat sink main body 100 by laser welding in a state of being placed on the heat dissipation surface 102 of the heat sink main body 100.

[0050] In laser welding, with the end of the heat dissipation fin portion 200 placed on the heat dissipation surface 102 of the heat sink main body portion 100, a laser is irradiated at the corner where the boundary line between the heat sink main body portion 100 and the heat dissipation fin portion 200, that is, the lower end portion of the heat dissipation fin portion 200 contacts the heat dissipation surface 102, so as to fix the heat dissipation fin portion 200 on the heat dissipation surface 102 of the heat sink main body portion 100 by welding.

[0051] The heat sink structure 1 according to the present invention is manufactured by casting the heat sink main body portion 100, manufacturing the heat dissipation fin portion 200 separately from the heat sink main body portion 100, and fixing the heat dissipation fin portion 200 to the heat sink main body portion 100 by laser welding.

[0052] On the other hand, a plurality of welding joints 107 to which a plurality of heat dissipation fin portions 200 are respectively joined by laser welding may be formed to protrude on the heat dissipation surface 102 of the heat sink main body portion 100.

[0053] Each of the plurality of welding joints 107 may be formed by a first heat dissipation fin support portion 110, a second heat dissipation fin support portion 120, and a support block portion 130.

[0054] However, each of the plurality of welding joints 107 may be formed only by the first heat dissipation fin support portion 110, may be formed only by the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, or may be formed only by the support block portion 130.

[0055] When each of the plurality of welding joints 107 is formed by a first heat dissipation fin support portion 110, a second heat dissipation fin support portion 120, and a support block portion 130, the support block portion 130 may be formed to protrude on the heat dissipation surface 102, and the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to protrude from both ends on the support block portion 130 so as to be separated from each other. That is, the first heat dissipation fin support portion 110 may be formed to protrude from one end on the support block portion 130, and the second heat dissipation fin support portion 120 may be formed to protrude from the other end on the support block portion 130 so as to be separated from the first heat dissipation fin support portion 110. In this case, the lower ends of each of the plurality of heat dissipation fin portions 200 are inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and are erected on the support block portion 130. The first heat dissipation fin support portion 110 can support one side of each of the plurality of heat dissipation fin portions 200, and the second heat dissipation fin support portion 120 can support the other side of each of the plurality of heat dissipation fin portions 200. And one of the spaces between one side of each of the plurality of heat dissipation fin portions 200 and one side of the first heat dissipation fin support portion 110 and the space between the other side of each of the plurality of heat dissipation fin portions 200 and one side of the second heat dissipation fin support portion 120 can be fixed by laser welding.

[0056] When each of the plurality of welding joints 107 is formed only by the first heat dissipation fin support portion 110, the first heat dissipation fin support portion 110 may be formed to protrude on the heat dissipation surface 102. In this case, the lower ends of each of the plurality of heat dissipation fin portions 200 are erected on the heat dissipation surface 102 on one side of the first heat dissipation fin support portion 110, and the first heat dissipation fin support portion 110 can support one side of each of the plurality of heat dissipation fin portions 200. And the space between one side of each of the plurality of heat dissipation fin portions 200 and one side of the first heat dissipation fin support portion 110 can be fixed by laser welding.

[0057] When each of the plurality of welding joints 107 is formed only by the first heat sink fin support portion 110 and the second heat sink fin support portion 120, the first heat sink fin support portion 110 and the second heat sink fin support portion 120 may be formed to protrude from each other on the heat dissipation surface 102. That is, the first heat sink fin support portion 110 may be formed to protrude on the heat dissipation surface 102, and the second heat sink fin support portion 120 may be formed to protrude from the first heat sink fin support portion 110 on the heat dissipation surface 102. In this case, the lower end portions of each of the plurality of heat sink fin portions 200 are inserted between the first heat sink fin support portion 110 and the second heat sink fin support portion 120 and erected on the heat dissipation surface 102, and the first heat sink fin support portion 110 can support one side of each of the plurality of heat sink fin portions 200, and the second heat sink fin support portion 120 can support the other side of each of the plurality of heat sink fin portions 200. And one of between one side of each of the plurality of heat sink fin portions 200 and one side of the first heat sink fin support portion 110 and between the other side of each of the plurality of heat sink fin portions 200 and one side of the second heat sink fin support portion 120 can be fixed by laser welding.

[0058] When each of the plurality of welding joints 107 is formed only by the support block portion 130, the support block portion 130 may be formed to protrude on the heat dissipation surface 102. In this case, the lower end portions of each of the plurality of heat sink fin portions 200 may be erected on the support block portion 130. And the lower end portions of each of the plurality of heat sink fin portions 200 can be fixed to the support block portion 130 by laser welding.

[0059] When each of the plurality of welding joints 107 includes the support block portion 130, the support block portion 130 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body portion 100.

[0060] When each of the plurality of welding joints 107 does not include the support block portion 130, the first heat sink fin support portion 110 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body portion 100, or the first heat sink fin support portion 110 and the second heat sink fin support portion 120 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body portion 100.

[0061] When each of the plurality of welded joints 107 includes a first heat dissipation fin support portion 110 and a second heat dissipation fin support portion 120, one end portion of each of the plurality of heat dissipation fin portions 200 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0062] Between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, there is a thickness t of the heat dissipation fin portion 200 1 which is the same as or slightly larger with a small interval, and the heat dissipation fin portion 200 is sandwiched and inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0063] Between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, there is a thickness t of the heat dissipation fin portion 200 1 Taking as an example, they are separated at an interval of 1 to 1.2 times the thickness t, and the heat dissipation fin portion 200 is sandwiched and inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0064] And, the thickness t of the first heat dissipation fin support portion 110 2 and the thickness t of the second heat dissipation fin support portion 120 3 are the same as, slightly larger than, or smaller than the thickness t of each of the plurality of heat dissipation fin portions 200 1 Taking as an example. More specifically, the thickness t of the first heat dissipation fin support portion 110 2 and the thickness t of the second heat dissipation fin support portion 120 3 are formed to be 0.7 to 1.1 times the thickness t of the heat dissipation fin portion 200 1 Taking as an example.

[0065] The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 support both sides of the heat dissipation fin portion 200 fixed by laser welding to play a role in increasing the fixing force of the heat dissipation fin portion 200, and can also melt during laser welding to serve as a filler material.

[0066] Either one of the first heat dissipating fin support portion 110 and the second heat dissipating fin support portion 120 is melted during laser welding to serve as a filler material. In this case, the thickness t 2 and the thickness t of the second heat dissipation fin support portion 120 3 The thickness t of each of the plurality of heat dissipation fin portions 200 is 1 If the thickness is more than 1.1 times larger than the thickness t 2 and the thickness t of the second heat dissipation fin support portion 120 3 The thickness t of each of the plurality of heat dissipation fin portions 200 is 1 If the thickness t of the first heat dissipation fin support portion 110 is less than 0.7 times the thickness t of the first heat dissipation fin support portion 110, the rigidity of the first heat dissipation fin support portion 110 may be insufficient. 2 and the thickness t of the second heat dissipation fin support portion 120 3 is the thickness t of each of the plurality of heat dissipation fin portions 200 1 It is more preferable that the ratio is 0.7 to 1.1.

[0067] The height h of the first heat dissipating fin support portion 110 and the height h of the second heat dissipating fin support portion 120 are each set equal to the thickness t 1 The thickness may be 1 to 2 times that of the above.

[0068] The height h of the first heat dissipating fin support portion 110 and the height h of the second heat dissipating fin support portion 120 are set to be equal to or larger than the thickness t 1 If the height h of the first heat dissipating fin support portion 110 and the height h of the second heat dissipating fin support portion 120 are smaller than the thickness t of each of the plurality of heat dissipating fin portions 200, the rigidity of supporting both sides of the heat dissipating fin portion 200 may be insufficient. 1 If the height h of the first heat dissipation fin support portion 110 and the height h of the second heat dissipation fin support portion 120 are more than twice the thickness t of each of the plurality of heat dissipation fin portions 200, the heat dissipation effect may be reduced. 1 It is more preferable that the thickness is 1 to 2 times.

[0069] The thickness t of the support block portion 130 4 is formed to be 2.4 to 3.3 times the thickness t of the heat dissipation fin portion 200, which is a thickness that enables the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 to be stably formed on the end portion side and does not affect the interval of the heat dissipation fin portions 200. 1 That is, when the thickness t of the support block portion 130 is more than 3.3 times the thickness t of each of the plurality of heat dissipation fin portions 200, the number of heat dissipation fin portions 200 provided on the heat sink main body portion 100 is small and the heat dissipation performance deteriorates. When the thickness t of the support block portion 130 is less than 2.4 times the thickness t of each of the plurality of heat dissipation fin portions 200, there is a problem that the thicknesses of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 cannot be sufficiently formed. Therefore, it is preferable that the thickness t of the support block portion 130 is formed to be 2.4 to 3.3 times the thickness t of each of the plurality of heat dissipation fin portions 200.

[0070] That is, the thickness t of the support block portion 130 4 is such that when it is more than 3.3 times the thickness t of each of the plurality of heat dissipation fin portions 200 1 the number of heat dissipation fin portions 200 provided on the heat sink main body portion 100 is small and the heat dissipation performance deteriorates. When the thickness t of the support block portion 130 4 is less than 2.4 times the thickness t of each of the plurality of heat dissipation fin portions 200 1 there is a problem that the thicknesses of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 cannot be sufficiently formed. Therefore, it is preferable that the thickness t of the support block portion 130 4 is formed to be 2.4 to 3.3 times the thickness t of each of the plurality of heat dissipation fin portions 200 1 That is, the thickness t of the support block portion 130 is formed to be 2.4 to 3.3 times the thickness t of each of the plurality of heat dissipation fin portions 200.

[0071] The support block portion 130 positions the heat dissipation fin portions 200 separately on the heat dissipation surface 102 of the heat sink main body portion 100, and positions the laser welding site at a height equal to or higher than a pre-designed height on the heat dissipation surface 102 of the heat sink main body portion 100, so that after laser welding, the phenomenon that the mounting surface 101 of the heat sink main body portion 100 warps due to heat can be prevented.

[0072] During laser welding, either one of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 serves as a filler material that melts together with the heat dissipation fin portion 200. After laser welding, the heat dissipation fin portion 200 is fixed between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 by laser welding.

[0073] After the heat dissipation fin portion 200 is inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, laser welding is performed on either one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and it is firmly fixed between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0074] After laser welding, the heat dissipation fin portion 200 is supported by the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and the rigidity in both side surface directions is increased, so that it can be firmly fixed on the heat dissipation surface 102 of the heat sink main body portion 100.

[0075] FIG. 6 is a diagram showing an enlarged view of a part in another embodiment of the heat sink structure according to the present invention.

[0076] Referring to FIG. 6, the heat sink structure 1 according to the present invention can include a first heat dissipation fin support portion 110 that protrudes on the heat dissipation surface of the heat sink main body portion 100 and supports one side of the heat dissipation fin portion 200.

[0077] As an example, the thickness of the first heat dissipation fin support portion 110 is the same as the thickness of the heat dissipation fin portion 200 or has a smaller thickness. More specifically, as an example, the thickness of the first heat dissipation fin support portion 110 is formed to be 0.7 to 1.1 times the thickness of the heat dissipation fin portion 200.

[0078] During laser welding, the laser is irradiated in an inclined direction between the first heat dissipation fin support portion 110 and the heat dissipation fin portion 200.

[0079] And the first heat dissipation fin support portion 110 supports one side of the heat dissipation fin portion 200 fixed by laser welding, plays a role in increasing the fixing force of the heat dissipation fin portion 200, and can be melted during laser welding to play a role as a filler material.

[0080] The first heat dissipation fin support portion 110 melts during laser welding and serves as a filler material. In this case, if the thickness of the first heat dissipation fin support portion 110 exceeds 1.1 times the thickness of each of the plurality of heat dissipation fin portions 200, it is difficult to serve as a filler material during laser welding. If the thickness of the first heat dissipation fin support portion 110 is less than 0.7 times the thickness of each of the plurality of heat dissipation fin portions 200, there is a problem that the rigidity for supporting the heat dissipation fin portion 200, that is, the rigidity against the opposite side of the welding portion is insufficient. Therefore, the thickness t of the first heat dissipation fin support portion 110 2 is preferably formed to be 0.7 to 1.1 times the thickness t of each of the plurality of heat dissipation fin portions 200. 1

[0081] Also, the height of the first heat dissipation fin support portion 110 may be formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions 200.

[0082] If the height of the first heat dissipation fin support portion 110 is less than the thickness of each of the plurality of heat dissipation fin portions 200, the rigidity for supporting both side surfaces of the heat dissipation fin portion 200 may be insufficient. If the height of the first heat dissipation fin support portion 110 is more than 2 times the thickness of each of the plurality of heat dissipation fin portions 200, it may be a factor in reducing the heat dissipation effect. Therefore, the height h of the first heat dissipation fin support portion 110 is preferably formed to be 1 to 2 times the thickness t of each of the plurality of heat dissipation fin portions 200. 1

[0083] FIGS. 7 to 10 are diagrams illustrating other shapes of the heat dissipation fin portion 200 in the heat sink structure according to the present invention.

[0084] More specifically, FIG. 7(a) is a diagram illustrating a heat dissipation fin portion 200 manufactured in the shape of the alphabet "U", and FIG. 7(b) is a perspective view showing a heat sink structure in which the alphabet "U"-shaped heat dissipation fin portion shown in FIG. 7(a) is fixed to the heat sink main body portion 100 by laser welding.

[0085] ​​Further, Fig. 8(a) is a diagram illustrating a heat radiation fin portion 200 manufactured in the shape of the alphabet "V", and Fig. 8(b) is a perspective view showing a heat sink structure in which the alphabet "V"-shaped heat radiation fin portion 200 shown in Fig. 8(a) is fixed to the heat sink main body portion 100 by laser welding.

[0086] Furthermore, Fig. 9(a) is a diagram illustrating a heat radiation fin portion 200 manufactured in a composite form of the alphabet "V" shape and the alphabet "U" shape, and Fig. 9(b) is a perspective view showing a heat sink structure in which the heat radiation fin portion 200 in the composite form of the alphabet "V" shape and the alphabet "U" shape shown in Fig. 9(a) is fixed to the heat sink main body portion 100 by laser welding.

[0087] Also, Fig. 10(a) is a diagram illustrating a heat radiation fin portion 200 manufactured in the shape of the alphabet "L", and Fig. 10(b) is a perspective view showing a heat sink structure in which the alphabet "L"-shaped heat radiation fin portion 200 shown in Fig. 10(a) is fixed to the heat sink main body portion 100 by laser welding.

[0088] Referring to Figs. 7 to 9, the heat radiation fin portion 200 can include a plate support member 210 and heat radiation fin members 220 standing on both end sides of the plate support member 210.

[0089] Also, referring to Fig. 10, the heat radiation fin portion 200 can include a plate support member 210 and a heat radiation fin member 220 arranged to stand on either one of both ends of the plate support member 210.

[0090] That is, the heat radiation fin member 220 may be arranged to stand on at least one of both ends of the plate support member 210.

[0091] When each of the plurality of welded joints 107 includes a support block portion 130, the plate support member 210 may be placed on the support block portion 130. And when each of the plurality of welded joints 107 does not include a support block portion 130, the plate support member 210 may be placed on the heat dissipation surface 102 of the heat sink main body portion 100.

[0092] Specifically described, as shown in FIG. 7, the heat dissipation fin member 220 may include vertical fins 221 that are arranged perpendicular to the plate support member 210 at both ends of the plate support member 210, or as shown in FIG. 8, may include inclined fins 222 that are formed at both ends of the plate support member 210 and are inclined such that the distance between them increases as the distance from the plate support member 210 increases.

[0093] Also, as shown in FIG. 9, the heat dissipation fin member 220 may include inclined fins 222 that are formed at both ends of the plate support member 210 and are inclined such that the distance between them increases as the distance from the plate support member 210 increases, and vertical fins 221 that extend perpendicular to the plate support member 210 from the ends of each of the inclined fins 222.

[0094] Furthermore, as shown in FIG. 10, the heat dissipation fin member 220 may include vertical fins 221 that are arranged perpendicular to the plate support member 210 at either one of the two ends of the plate support member 210.

[0095] That is, as shown in FIGS. 7 and 10, the heat dissipation fin member 220 may include vertical fins 221 that are arranged perpendicular to the plate support member 210 at at least one of the two ends of the plate support member 210.

[0096] In addition, the heat dissipation fin member 220 may be manufactured in various known shapes according to the heat dissipation design structure for dissipating heat from the product to be heat-dissipated.

[0097] On the one hand, an embodiment of the method for manufacturing a heat sink according to the present invention includes a preparation step of separately manufacturing a heat sink main body 100 and a plurality of heat dissipation fin parts 200 having a heat dissipation function, and after the preparation step, a laser welding step of fixing the plurality of heat dissipation fin parts 200 to the heat dissipation surface 102 of the heat sink main body 100 by laser welding while being separated from each other.

[0098] As an example, the preparation step manufactures the heat sink main body 100 by casting, and the plurality of heat dissipation fin parts 200 are manufactured by cutting a pre-manufactured metal plate, that is, for example, an aluminum plate or an aluminum alloy plate.

[0099] As an example, in the laser welding step, with the heat dissipation fin part 200 standing and the lower end side placed on the heat dissipation surface 102, a laser is irradiated obliquely between one side surface of the heat dissipation fin part 200 and the heat dissipation surface 102 to fix the heat dissipation fin part 200 to the heat dissipation surface 102 by laser welding.

[0100] Also, in the preparation step, a plurality of welding joints 107 may be formed to protrude from the heat dissipation surface 102 of the heat sink main body 100, and in the laser welding step, the plurality of heat dissipation fin parts 200 may be respectively joined to the plurality of welding joints 107 by laser welding as another example.

[0101] Specifically, in the preparation step, the heat sink main body 100 may be manufactured by casting, and a first heat dissipation fin support part 110 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100. In this case, in the laser welding step, the lower end part of each of the plurality of heat dissipation fin parts is stood on the heat dissipation surface on one side of the first heat dissipation fin support part, the first heat dissipation fin support part supports one side of each of the plurality of heat dissipation fin parts, and the space between one side of each of the plurality of heat dissipation fin parts and one side of the first heat dissipation fin support part can be fixed by laser welding.

[0102] Alternatively, in the preparation step, the heat sink main body 100 may be manufactured by casting, and the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to project from each other on the heat dissipation surface 102 of the heat sink main body 100. In this case, in the laser welding step, the lower end portions of the plurality of heat dissipation fin portions are inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and are erected on the heat dissipation surface. The first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions, and the second heat dissipation fin support portion supports the other side of each of the plurality of heat dissipation fin portions. One of the spaces between one side of each of the plurality of heat dissipation fin portions and one side of the first heat dissipation fin support portion and the spaces between the other side of each of the plurality of heat dissipation fin portions and one side of the second heat dissipation fin support portion can be fixed by laser welding.

[0103] Alternatively, in the preparation step, the heat sink main body 100 may be manufactured by casting, and the support block portion 130 may be formed to project on the heat dissipation surface 102 of the heat sink main body 100. In this case, in the laser welding step, the lower end portions of the plurality of heat dissipation fin portions are erected on the support block portion and can be fixed to the support block portion by laser welding.

[0104] Alternatively, in the preparation step, the heat sink main body 100 may be manufactured by casting, and the support block portion 130 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100. The first heat dissipation fin support portion 110 may be formed to protrude at one end on the support block portion 130, or the second heat dissipation fin support portions 120 may be formed to protrude at both ends on the support block portion 130 so as to be spaced apart from the first heat dissipation fin support portion 110. In this case, in the laser welding step, the lower ends of the plurality of heat dissipation fin portions are inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and are erected on the support block portion. The first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions, and the second heat dissipation fin support portion supports the other side of each of the plurality of heat dissipation fin portions. One of the space between one side of each of the plurality of heat dissipation fin portions and one side of the first heat dissipation fin support portion and the space between the other side of each of the plurality of heat dissipation fin portions and one side of the second heat dissipation fin support portion can be fixed by laser welding.

[0105] As an example, the preparation step manufactures the heat sink main body 100 by casting, and manufactures the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 on the heat dissipation surface so that the heat dissipation fin portion 200 can be inserted therebetween. The laser welding step includes a heat dissipation fin assembly step of inserting the heat dissipation fin portion 200 between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and after the heat dissipation fin assembly step, a heat dissipation fin welding step of irradiating a laser on either one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 to laser-weld the heat dissipation fin portion 200.

[0106] More specifically, in the heat dissipation fin welding step, the laser is irradiated obliquely between the first heat dissipation fin support portion 110 and the heat dissipation fin portion 200, or between the second heat dissipation fin support portion 120 and the heat dissipation fin portion 200, or the laser is simultaneously irradiated between the first heat dissipation fin support portion 110 and the heat dissipation fin portion 200 and between the second heat dissipation fin support portion 120 and the heat dissipation fin portion 200 to fix the heat dissipation fin portion 200 by laser welding.

[0107] FIG. 11 is a photograph of a first test example in which the heat dissipation fin portion 200 in the method for manufacturing a heat sink according to the present invention is laser welded. In the first test example, a linear heat dissipation fin portion 200 having a thickness of 1T (mm) is erected on the heat dissipation surface 102 of the heat sink main body portion 100 having a thickness of 2T (mm), and fillet welding is advanced.

[0108] Table 1 below illustrates the laser welding conditions in the first test example, and is an example in which laser welding is advanced by setting the minimum heat input (output).

[0109]

Table 1

[0110] (a) of FIG. 11 is a photograph of the welded portion enlarged, and (b) of FIG. 11 is a photograph of the bottom surface of the heat sink main body portion 100 after welding.

[0111] Referring to FIG. 11(a), when one side of the heat dissipation fin portion 200 is fixed by laser welding with the lower end portion of the linear heat dissipation fin portion 200 having a thickness of 1T (mm) directly placed on the heat dissipation surface 102 of the heat sink main body portion 100, the rigidity of the welded portion by laser welding is ensured, but it can be confirmed that the rigidity of the heat dissipation fin portion 200 on the opposite side of the welded portion is difficult to ensure.

[0112] In this case, the heat dissipation fin portion 200 has insufficient fixing force against the force generated from the welded portion side toward the opposite side of the welded portion, and there is a risk of breakage during use. To prevent this, there is a nuisance that both sides of the heat dissipation fin portion 200 must be laser welded.

[0113] Further, referring to Fig. 11(b), when laser welding one side of the linear heat dissipation fin portion 200 with a thickness of 1T (mm) while directly placing the lower end portion of the linear heat dissipation fin portion 200 on the heat dissipation surface 102 of the heat sink main body portion 100, it can be confirmed that warping deformation has occurred within the dotted line portion indicated by reference symbol A on the mounting surface 101 which is the bottom surface of the heat sink main body portion 100 even when laser welding is advanced by setting the minimum heat input (output).

[0114] Fig. 12 is a photograph of a second test example in which the heat dissipation fin portion 200 in the method for manufacturing a heat sink according to the present invention is laser welded. In the second test example, the support block portion 130 protrudes on the heat dissipation surface of the heat sink main body portion 100 with a thickness of 2T (mm), the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 with a thickness of 1T (mm) protrude on the support block portion 130, the lower end portion of the linear heat dissipation fin portion 200 with a thickness of 1T (mm) is inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and laser is irradiated obliquely between the second heat dissipation fin support portion 120 and the heat dissipation fin portion 200 to advance fillet welding.

[0115] Table 2 below exemplifies the laser welding conditions in the second test example, which is an example in which laser welding is advanced by setting a heat input (output) larger than that in the first test example.

[0116]

Table 2

[0117] Fig. 12(a) is a magnified photograph of the welding portion, and Fig. 12(b) is a photograph of the bottom surface of the heat sink main body portion 100 after welding.

[0118] Referring to FIG. 12(a), the first heat sink fin support portion 110 supports one side that is not laser welded in the heat sink fin portion 200 to reinforce the rigidity on the opposite side of the laser welding site. It can be confirmed that the second heat sink fin support portion 120 melts a part on the upper side during laser welding to serve as a filler material and at the same time further increases the rigidity of the laser welding site. Also, referring to FIG. 12(b), it can be confirmed that no warping deformation occurs on the mounting surface 101 which is the bottom surface of the heat sink main body portion 100.

[0119] As described above, in the present invention, after separately manufacturing the heat sink main body portion 100 and the plurality of heat sink fin portions 200, the plurality of heat sink fin portions 200 are fixed to the heat sink main body portion 100 by laser welding, thereby minimizing the thickness and interval of the plurality of heat sink fin portions to improve the heat dissipation performance and greatly reduce the weight. Also, in the present invention, by manufacturing only the heat sink main body portion 100 by casting, the production time required and the manufacturing cost can be greatly reduced.

[0120] Those having ordinary knowledge in the technical field to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing its technical idea and essential features. Therefore, it must be understood that the embodiments described above are illustrative in every respect and not restrictive. The scope of the present invention is indicated by the claims described later rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention.

Industrial Applicability

[0121] The present invention provides a heat sink structure and a manufacturing method thereof, which can minimize the thickness and interval of a plurality of heat sink fin portions and greatly reduce the manufacturing cost by separately manufacturing a heat sink main body portion and the plurality of heat sink fin portions and then fixing the plurality of heat sink fin portions to the heat sink main body portion by laser welding.

Explanation of Reference Numerals

[0122] 1: Heat sink structure, 100: Heat sink main body 101: Mounting surface, 102: Heat dissipation surface 107: Weld joint, 110: First heat dissipation fin support part 120: Second heat dissipation fin support part, 130: Support block part 200: Heat dissipation fin part, 210: Plate support member 220: Heat dissipation fin member, 221: Vertical fin 222: Inclined fin

Claims

1. A heat sink body portion provided with a mounting surface on one side where a product to be heat-dissipated is located, and a heat dissipation surface for dissipating heat on a surface different from the one surface; A heat sink structure including a plurality of heat dissipation fin portions that are erected on the heat dissipation surface of the heat sink body portion and fixed by laser welding.

2. The heat sink structure according to claim 1, wherein a plurality of welding joints to which the plurality of heat dissipation fin portions are respectively joined by laser welding are formed to protrude on the heat dissipation surface of the heat sink body portion.

3. Each of the plurality of welding joints includes a first heat dissipation fin support portion protruding on the heat dissipation surface; The lower end portion of each of the plurality of heat dissipation fin portions is erected on the heat dissipation surface on one side of the first heat dissipation fin support portion, and the first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions; The heat sink structure according to claim 2, wherein between one side of each of the plurality of heat dissipation fin portions and one side of the first heat dissipation fin support portion is fixed by laser welding.

4. Each of the plurality of welding joints, includes a first heat dissipation fin support portion protruding on the heat dissipation surface; and a second heat dissipation fin support portion protruding on the heat dissipation surface and spaced apart from the first heat dissipation fin support portion; The lower end portion of each of the plurality of heat dissipation fin portions is inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and erected on the heat dissipation surface, the first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions, the second heat dissipation fin support portion supports the other side of each of the plurality of heat dissipation fin portions; The heat sink structure according to claim 2, wherein one of between one side of each of the plurality of heat dissipation fin portions and one side of the first heat dissipation fin support portion and between the other side of each of the plurality of heat dissipation fin portions and one side of the second heat dissipation fin support portion is fixed by laser welding.

5. Each of the plurality of welding joints includes a support block portion protruding on the heat dissipation surface; The heat sink structure according to claim 2, wherein the lower end portion of each of the plurality of heat dissipation fin portions is erected on the support block portion and fixed to the support block portion by laser welding.

6. Each of the plurality of welding joints, includes a support block portion protruding on the heat dissipation surface; and a first heat dissipation fin support portion protruding at one end on the support block portion; a second heat sink fin support portion that is formed to protrude separately from the first heat sink fin support portion at the other end on the support block portion; lower ends of the plurality of heat sink fin portions are inserted between the first heat sink fin support portion and the second heat sink fin support portion and are erected on the support block portion, the first heat sink fin support portion supports one side of each of the plurality of heat sink fin portions, and the second heat sink fin support portion supports the other side of each of the plurality of heat sink fin portions; One of between one side of each of the plurality of heat sink fin portions and one side of the first heat sink fin support portion and between the other side of each of the plurality of heat sink fin portions and one side of the second heat sink fin support portion is fixed by laser welding. The heat sink structure according to claim 2. **Claim 7** The heat sink structure according to claim 3, wherein the thickness of the first heat sink fin support portion is formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat sink fin portions. **Claim 8** The heat sink structure according to claim 7, wherein the height of the first heat sink fin support portion is formed to be 1 to 2 times the thickness of each of the plurality of heat sink fin portions. **Claim 9** The heat sink structure according to claim 4, wherein the thickness of the first heat sink fin support portion and the thickness of the second heat sink fin support portion are formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat sink fin portions. **Claim 10** The heat sink structure according to claim 9, wherein the height of the first heat sink fin support portion and the height of the second heat sink fin support portion are formed to be 1 to 2 times the thickness of each of the plurality of heat sink fin portions. **Claim 11** The heat sink structure according to claim 5, wherein the thickness of the support block portion is formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat sink fin portions. **Claim 12** The thickness of the first heat sink fin support portion and the thickness of the second heat sink fin support portion are formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat sink fin portions, The heat sink structure according to claim 6, wherein the thickness of the support block portion is formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat sink fin portions. **Claim 13** The heat sink structure according to claim 12, wherein the height of the first heat sink fin support portion and the height of the second heat sink fin support portion are formed to be 1 to 2 times the thickness of each of the plurality of heat sink fin portions. **Claim 14** Each of the plurality of heat sink fin portions a plate support member; The heat sink structure according to claim 1, comprising a heat radiation fin member erected and disposed at at least one of both ends of the plate support member.

15. The heat radiation fin member The heat sink structure according to claim 14, comprising vertical fins disposed perpendicular to the plate support member at at least one of both ends of the plate support member.

16. The heat radiation fin member The heat sink structure according to claim 14, comprising inclined fins formed at both ends of the plate support member and inclined so that the distance between them becomes farther as they are farther from the plate support member.

17. The heat radiation fin member The heat sink structure according to claim 16, further comprising vertical fins extending perpendicularly to the plate support member from each end of the inclined fins.

18. A preparation step of separately manufacturing a heat sink main body portion provided with a mounting surface on which a product to be heat-radiated is located on one surface and a heat radiation surface for releasing heat on a surface different from the one surface, and a plurality of heat radiation fin portions having a heat radiation effect; A method of manufacturing a heat sink structure, comprising a laser welding step of fixing the plurality of heat radiation fin portions to the heat radiation surface of the heat sink main body portion separately from each other by laser welding.

19. In the preparation step, the heat sink main body portion is manufactured by casting, the plurality of heat radiation fin portions are manufactured by cutting a pre-manufactured metal plate. The method of manufacturing a heat sink structure according to claim 18.

20. In the preparation step, a plurality of welding joints are formed to protrude on the heat radiation surface of the heat sink main body portion, In the laser welding step, the plurality of heat radiation fin portions are respectively joined to the plurality of welding joints by laser welding. The method of manufacturing a heat sink structure according to claim 18.

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