Heat sink structure and manufacturing method thereof

Abstract

A heat sink structure and a manufacturing method thereof are provided in which the heat sink main body and a plurality of heat dissipation fin portions are manufactured separately, and then the plurality of heat dissipation fin portions are fixed to the heat sink main body by laser welding, and the plurality of heat dissipation fin portions are formed into thin, long plates compared to the heat sink main body, thereby ensuring a sufficient heat dissipation surface and improving heat dissipation efficiency. [Solution] The heat sink structure includes a heat sink main body having a mounting surface on one side on which the product to be dissipated is located and a heat dissipation surface on a side different from the one side for dissipating heat, and a plurality of heat dissipation fin portions that are erected on the heat dissipation surface of the heat sink main body and joined by laser welding.

Description

[Technical Field]

[0001] The present invention relates to a heat sink structure and a manufacturing method therefor, and more particularly to a heat sink structure in which heat dissipation fins are joined to a heat sink body by laser welding. [Background technology]

[0002] Generally, a heat sink is provided in a product that requires heat dissipation to enable the heat to be dissipated effectively.

[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 equipment and radioactive machinery, to prevent damage caused by heat and ensure stable operation, and is applied in various shapes according to the product.

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

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

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

[0007] However, the heat sink of the prior art is manufactured by extrusion or casting, and the heat sink plate and the plurality of heat sink fins are integrally formed. Therefore, it is difficult to reduce the thickness and spacing of the plurality of heat sink fins, and the number of the plurality of heat sink fins is small, which limits the heat dissipation performance and makes it difficult to reduce the weight.

[0008] Furthermore, since the heat sinks of the prior art are manufactured by extrusion or casting, the molds are complicatedly designed to form the plurality of heat dissipation fins, which increases manufacturing costs. In addition, since molds must be manufactured separately for each product, it takes a lot of time to design and manufacture the molds, and there are also problems with a high reject rate during manufacturing.

[0009] In particular, since the heat sink of the prior art is manufactured by extrusion or casting, the heat dissipation fins cannot be made thinner and longer than the heat sink body, resulting in a problem of reduced heat dissipation efficiency. Summary of the Invention [Problem to be solved by the invention]

[0010] The technical object of the present invention is to provide a heat sink structure and a manufacturing method thereof in which a heat sink main body and a plurality of heat dissipation fin portions are manufactured separately, and then the plurality of heat dissipation fin portions are fixed to the heat sink main body by laser welding, and the plurality of heat dissipation fin portions are formed into thin, long plates compared to the heat sink main body, thereby ensuring a sufficient heat dissipation surface and improving heat dissipation efficiency.

[0011] Another technical object of the present invention is to provide a heat sink structure and a manufacturing method thereof that can significantly reduce manufacturing costs by manufacturing the heat sink body and the heat dissipation fins separately and then fixing the heat dissipation fins to the heat sink body by laser welding, thereby minimizing the thickness and spacing of the heat dissipation fins.

[0012] The technical problems of the present invention are not limited to those 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 problem]

[0013] To achieve the above object, a heat sink structure according to the present invention comprises a heat sink body and a plurality of heat dissipation fins. One side of the heat sink body is provided with a mounting surface on which a product to be heat dissipated is positioned. Another side of the heat sink body is provided with a heat dissipation surface for dissipating heat. The plurality of heat dissipation fins are erected on the heat dissipation surface of the heat sink body and joined by laser welding.

[0014] The heat sink body may have a plurality of protruding welded joints formed on the heat dissipation surface to which the plurality of heat dissipation fins are respectively connected by laser welding.

[0015] A welding protrusion may be formed at a lower end of each of the plurality of heat dissipation fins to be laser-welded to the plurality of welding portions, and the welding protrusion may be formed to be thicker than each of the plurality of heat dissipation fins.

[0016] The plurality of welded joints may be formed in a rounded shape with recessed ends at both ends of a protruding portion of the heat sink body from the heat dissipation surface, or in a rounded shape with bulged ends at both ends of a protruding portion of the heat sink body.

[0017] Each of the plurality of welded joints may be formed as a first heat dissipation fin support. The first heat dissipation fin support may be formed to protrude from the heat dissipation surface. The welded joint protrusion may stand on the heat dissipation surface at one side of the first heat dissipation fin support. One side of the welded joint protrusion may be joined to one side of the first heat dissipation fin support by laser welding.

[0018] Each of the plurality of welded joints may include a first heat dissipating fin support and a second heat dissipating fin support. The welded joints may be inserted between the first heat dissipating fin support and the second heat dissipating fin support and stand on the heat dissipating surface. At least one side of the welded joint protrusion may be laser-welded to one side of at least one of the first heat dissipating fin support and the second heat dissipating fin support.

[0019] Each of the plurality of welded joints may be formed as a support block. The support block may be formed to protrude from the heat dissipation surface. The welded joint protrusion may be erected on the support block. At least one side of the welded joint protrusion may be laser-welded to the support block.

[0020] Each of the plurality of welded joints may include a support block portion, a first heat dissipating fin support portion, and a second heat dissipating fin support portion. The support block portion may be formed to protrude from the heat dissipating surface. The first heat dissipating fin support portion may be formed to protrude from one end of the support block portion. The second heat dissipating fin support portion may be formed to protrude from the other end of the support block portion, spaced apart from the first heat dissipating fin support portion. The welded joint protrusion may be inserted between the first heat dissipating fin support portion and the second heat dissipating fin support portion and stand on the support block portion. At least one side of the welded joint protrusion may be laser-welded to one side of at least one of the first heat dissipating fin support portion and the second heat dissipating fin support portion.

[0021] One side of the first heat radiation fin support portion and one side of the welding connection protrusion may be formed in a bulging round shape.

[0022] At least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion and at least one side of the welding connection protrusion may be formed in a convex round shape.

[0023] At least one side of the welding projection may be formed in a convex round shape.

[0024] The bulging round shape may be a shape that allows the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin portions during the laser welding.

[0025] The thickness of the first heat dissipation fin support portion may be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions, and the height of the first heat dissipation fin support portion may be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

[0026] The thickness of the first heat dissipation fin support portion and the thickness of the second heat dissipation fin support portion may be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions. The height of the first heat dissipation fin support portion and the height of the second heat dissipation fin support portion may be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

[0027] The minimum thickness of the support block portion may be 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

[0028] To achieve the above object, a method for manufacturing a heat sink structure according to the present invention includes a preparation step and a laser welding step. In the preparation step, a heat sink body and a plurality of heat dissipation fins are separately manufactured. One side of the heat sink body is provided with a mounting surface on which a product to be dissipated is positioned. A heat dissipation surface for dissipating heat is provided on a side other than the one side of the heat sink body. The plurality of heat dissipation fins perform a heat dissipation function. In the laser welding step, the plurality of heat dissipation fins are fixed to the heat dissipation surface of the heat sink body at a distance from each other by laser welding.

[0029] In the preparation step, the heat sink body can be manufactured by casting, and the plurality of heat dissipation fins can be manufactured by cutting a pre-manufactured metal plate.

[0030] In the preparation step, a plurality of weld joints may be protruded from the heat dissipation surface of the heat sink body. In the preparation step, a weld joint protrusion thicker than the thickness of each of the plurality of heat dissipation fins may be formed at a lower end of each of the plurality of heat dissipation fins. In the laser welding step, the weld joint protrusion may be laser-welded to each of the plurality of weld joints.

[0031] Other specific details of the embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0032] The heat sink structure and manufacturing method of the present invention has the advantage that the heat sink main body and multiple heat dissipation fin portions are manufactured separately, and then the multiple heat dissipation fin portions are fixed to the heat sink main body by laser welding, and the multiple heat dissipation fin portions are formed into thin, long plates compared to the heat sink main body, thereby ensuring a sufficient heat dissipation surface and improving heat dissipation efficiency.

[0033] In addition, the heat sink structure and manufacturing method according to the present invention have the advantage that the heat sink body and the plurality of heat dissipation fins are manufactured separately, and then the plurality of heat dissipation fins are fixed to the heat sink body by laser welding, thereby minimizing the thickness and spacing of the plurality of heat dissipation fins and significantly reducing manufacturing costs.

[0034] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a perspective view illustrating a heat sink structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a rear perspective view of FIG. 1. [Figure 3] 3 is an exploded perspective view of FIG. 2 exploded into a heat sink main body and a plurality of heat dissipation fins. [Figure 4] FIG. 3 is a partially enlarged view of FIG. 2. [Figure 5] FIG. 3 is a partial plan view of FIGS. 1 and 2. [Figure 6] FIG. 6 is a partially enlarged view of FIG. 5. [Figure 7] FIG. 7 is an exploded view of FIG. [Figure 8] 10A and 10B illustrate a heat sink structure according to another embodiment of the present invention. [Figure 9] 10 is a photograph of a first test example in which a heat dissipation fin portion is laser welded in the manufacturing method of the heat sink structure according to the present invention. [Figure 10] 10 is a photograph of a second test example in which a heat dissipation fin portion is laser welded in the manufacturing method of the heat sink structure according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, a heat sink structure and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings.

[0037] FIG. 1 is a perspective view showing a heat sink structure according to an embodiment of the present invention, FIG. 2 is a rear perspective view of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 2 exploded into a heat sink main body and a plurality of heat dissipation fins, FIG. 4 is an enlarged view of a portion of FIG. 2, FIG. 5 is a partial plan view of FIGS. 1 and 2, FIG. 6 is an enlarged view of a portion of FIG. 5, and FIG. 7 is an exploded view of FIG. 6.

[0038] 1 to 7, a heat sink structure 1 according to an embodiment of the present invention may include a heat sink body 100 and a plurality of heat dissipation fins 200. As shown in FIG.

[0039] The heat sink structure according to an embodiment of the present invention can be manufactured by manufacturing the heat sink body 100 by casting, manufacturing a plurality of heat dissipation fins 200 separately from the heat sink body 100, and then joining the plurality of heat dissipation fins 200 to the heat sink body 100 by laser welding.

[0040] One surface of the heat sink body 100 may be provided with a mounting surface 101 on which a product to be dissipated heat is placed. Here, the product may include electronic components that generate a predetermined amount of heat when power is supplied. That is, the product may be a printed circuit board on which Rx and Tx elements responsible for outputting and transmitting signals in an antenna device are mounted, or a housing that houses the printed circuit board.

[0041] Therefore, an accommodation space 105 for accommodating the product may be formed on the mounting surface 101 of the heat sink body 100. However, the accommodation space 105 does not necessarily have to be formed, and in this case, the heat sink body 100 may be formed in a plate shape, and the product may be arranged so as to be in surface contact with the mounting surface 101 of the heat sink body 100.

[0042] The other surface of the heat sink body 100 may be a heat dissipation surface 102 to which a plurality of heat dissipation fins 200 are fixed, which dissipate heat through heat exchange.

[0043] The heat dissipation surface 102 of the heat sink body 100 is shown as an example to be the surface opposite to the mounting surface 101, but may also be changed to a surface different from the mounting surface 101 depending on the product design.

[0044] The plurality of heat dissipation fins 200 can perform a heat dissipation function of dissipating heat generated in the product to the outside of the heatsink body 100. The plurality of heat dissipation fins 200 may be formed in the shape of a plate that is thinner than the heatsink body 100. The length L1 of each of the plurality of heat dissipation fins 200 may be longer than the length L2 from the mounting surface 101 to the heat dissipation surface 102 of the heatsink body 100. The plurality of heat dissipation fins 200 may have a linear panel shape as an example, but may also be manufactured in various other shapes such as a curved panel shape or a rod shape.

[0045] The heat sink body 100 and the heat dissipation fins 200 are made of, for example, aluminum or aluminum alloy material, but may also be made of various other known materials with excellent thermal conductivity for manufacturing a heat sink.

[0046] For example, the heat sink body 100 is manufactured into a pre-designed shape by casting, and the heat dissipation fin 200 is manufactured by cutting a pre-manufactured aluminum or aluminum alloy panel into a pre-designed size.

[0047] The heat dissipation surface 102 of the heat sink body 100 may have a plurality of protruding welded joints 107 to which the plurality of heat dissipation fins 200 are respectively joined by laser welding.

[0048] However, the welded joint 107 may not be formed on the heat dissipation surface 102 of the heat sink body 100. In this case, the plurality of heat dissipation fins 200 may be positioned so as to stand on the heat dissipation surface 102 of the heat sink body 100. In a state where they are placed on the heat dissipation surface 102 of the heat sink body 100, they may be fixed to the heat dissipation surface 102 of the heat sink body 100 by laser welding.

[0049] Laser welding is performed by placing the end of the heat dissipation fin portion 200 on the heat dissipation surface 102 of the heat sink main body portion 100, and irradiating a laser onto the boundary between the heat sink main body portion 100 and the heat dissipation fin portion 200, i.e., the corner of one end of the heat dissipation fin portion 200 that meets the heat dissipation surface 102, thereby fixing the heat dissipation fin portion 200 to the heat dissipation surface 102 of the heat sink main body portion 100 by laser welding.

[0050] The plurality of welded joints 107 may be formed so that the thickness L3 of the start end of the portion protruding from the heat dissipation surface 102 of the heat sink body 100 is smaller than the thickness L4 of the end in the protruding direction.

[0051] Specifically, the width of the plurality of welded joints 107 may be narrowed as they approach the end in the protruding direction from the heat dissipation surface 102 of the heat sink main body 100. This allows laser welding even at a low laser irradiation angle during laser welding, and therefore the distance between the plurality of heat dissipation fins 200 on the heat dissipation surface 102 of the heat sink main body 100 can be narrowed and a greater number of the plurality of heat dissipation fins 200 can be provided, thereby improving heat dissipation performance.

[0052] 6 and 7, the plurality of welded joints 107 may be formed in rounded shapes R1 and R2, with recessed sides at the beginning of the portion protruding from the heat dissipation surface 102 of the heat sink body 100. The plurality of welded joints 107 may also be formed in rounded shapes R3 and R4, with expanded sides at the end of the protruding portion. The radii of curvature of the rounded shapes R1 and R2 may be the same, and the radii of curvature of the rounded shapes R3 and R4 may be the same. The radii of curvature of the rounded shapes R1 and R2 may be larger than the radii of curvature of the rounded shapes R3 and R4.

[0053] A welded connection protrusion 210 may be formed at the lower end of each of the plurality of heat dissipation fin units 200, and may be laser-welded to the welded connection portion 107. The welded connection protrusion 210 may be formed to be thicker than the thickness t1 of each of the plurality of heat dissipation fin units 200. The welded connection protrusion 210 may be formed to protrude from both sides of the lower end of each of the plurality of heat dissipation fin units 200.

[0054] Meanwhile, each of the plurality of welded joints 107 may include a first heat dissipating fin support portion 110, a second heat dissipating fin support portion 120, and a support block portion 130. However, the welded joint 107 may be formed of only the first heat dissipating fin support portion 110, only the first heat dissipating fin support portion 110 and the second heat dissipating fin support portion 120, or only the support block portion 130.

[0055] When each of the plurality of welded joints 107 is formed of 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 from 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 apart from each other at both ends of the support block portion 130. That is, the first heat dissipation fin support portion 110 may be formed to protrude from one end of the support block portion 130, and the second heat dissipation fin support portion 120 may be formed to protrude apart from the first heat dissipation fin support portion 110 at the other end of the support block portion 130.

[0056] In this case, the welded connection protrusion 210 may be inserted between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 and stand on the support block part 130, and at least one side of the welded connection protrusion 210 may be laser welded to one side of at least one of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120.

[0057] In addition, at least one side of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 and at least one side of the welded connection protrusion 210 may be formed into a convex round shape R5, R6, R7, R8. Here, the convex round shapes R5, R6, R7, R8 may be shapes that allow the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during the laser welding.

[0058] If the laser can be irradiated at an angle of less than 3° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the thickness of the laser weld may be thin and the heat dissipating fin portion 200 may not be firmly bonded to the first heat dissipating fin support portion 110. If the laser can be irradiated at an angle of more than 7° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the spacing between the plurality of heat dissipating fin portions 200 may be widened, reducing the number of the plurality of heat dissipating fin portions 200 and thereby reducing the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5, R6, R7, and R8 be shapes that allow the laser to be irradiated at an angle of 3 to 7° during the laser welding.

[0059] When each of the plurality of welded 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 from the heat dissipation surface .

[0060] In this case, the welding connection protrusion 210 may be erected on the heat dissipation surface 102 on one side of the first heat dissipation fin support part 110, and one side of the welding connection protrusion 210 may be connected to one side of the first heat dissipation fin support part 110 by laser welding.

[0061] In addition, one side of the first heat dissipation fin support part 110 and one side of the welded connection protrusion 210 may be formed with convex round shapes R5 and R7. Here, the convex round shapes R5 and R7 may be shapes that allow the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during laser welding.

[0062] If the laser can be irradiated at an angle of less than 3° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the thickness of the laser weld may be thin and the heat dissipating fin portion 200 may not be firmly bonded to the first heat dissipating fin support portion 110. If the laser can be irradiated at an angle of more than 7° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the spacing between the plurality of heat dissipating fin portions 200 may be widened, reducing the number of the plurality of heat dissipating fin portions 200 and thereby reducing the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5 and R7 be shapes that allow the laser to be irradiated at an angle of 3 to 7° during the laser welding.

[0063] When each of the multiple welded joints 107 is formed only by the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to protrude from the heat dissipation surface 102.

[0064] In this case, the welding connection protrusion 210 may be inserted between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 and stand on the heat dissipation surface 102, and at least one side of the welding connection protrusion 210 may be laser welded to one side of at least one of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120.

[0065] In addition, at least one side of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 and at least one side of the welded connection protrusion 210 may be formed into a convex round shape R5, R6, R7, R8. Here, the convex round shapes R5, R6, R7, R8 may be shapes that allow the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during the laser welding.

[0066] If the laser can be irradiated at an angle of less than 3° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the thickness of the laser weld may be thin and the heat dissipating fin portion 200 may not be firmly bonded to the first heat dissipating fin support portion 110. If the laser can be irradiated at an angle of more than 7° to each of the plurality of heat dissipating fin portions 200 during the laser welding, the spacing between the plurality of heat dissipating fin portions 200 may be widened, reducing the number of the plurality of heat dissipating fin portions 200 and thereby reducing the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5, R6, R7, and R8 be shapes that allow the laser to be irradiated at an angle of 3 to 7° during the laser welding.

[0067] When each of the plurality of welded joints 107 is formed only by the support block portion 130 , the support block portion 130 may be formed to protrude above the heat dissipation surface 102 .

[0068] In this case, the welding projection 210 may be erected on the support block 130, and at least one side of the welding projection 210 may be laser-welded to the support block 130.

[0069] In addition, at least one side of the welded joint protrusion 210 may be formed in a convex round shape R7, R8, which may allow the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin portions 200 during the laser welding.

[0070] If the laser can be irradiated at an angle of less than 3° to each of the plurality of heat dissipation fin portions 200 during the laser welding, the thickness of the laser weld may be thin and the heat dissipation fin portion 200 may not be firmly bonded to the first heat dissipation fin support portion 110. If the laser can be irradiated at an angle of more than 7° to each of the plurality of heat dissipation fin portions 200 during the laser welding, the spacing between the plurality of heat dissipation fin portions 200 may be widened, reducing the number of the plurality of heat dissipation fin portions 200 and thereby reducing the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R7 and R8 be shapes that allow the laser to be irradiated at an angle of 3 to 7° during the laser welding.

[0071] The radii of curvature of the round shapes R5 and R6 may be the same as each other, and the radii of curvature of the round shapes R7 and R8 may be the same as each other. The radii of curvature of the round shapes R5 and R6 may be the same as the radii of curvature of the round shapes R3 and R4. The radii of curvature of the round shapes R7 and R8 may be smaller than the radii of curvature of the round shapes R5 and R6.

[0072] The first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 are spaced apart by a distance equal to or slightly larger than the thickness t1 of the heat dissipation fin part 200, so that the heat dissipation fin part 200 can be inserted and fitted between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120.

[0073] The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 are spaced apart by a distance 1 to 1.2 times the thickness t1 of the heat dissipation fin portion 200, so that the heat dissipation fin portion 200 can be inserted and fitted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0074] The thickness t2 of the first heat dissipating fin support portion 110 and the thickness t3 of the second heat dissipating fin support portion 120 may be the same as or slightly larger or smaller than the thickness t1 of each of the plurality of heat dissipating fin portions 200. More specifically, the thickness t2 of the first heat dissipating fin support portion 110 and the thickness t3 of the second heat dissipating fin support portion 120 may be 0.7 to 1.1 times the thickness t1 of each of the plurality of heat dissipating fin portions 200.

[0075] The first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 support both sides of the heat dissipation fin part 200 fixed by laser welding, thereby increasing the fixing force of the heat dissipation fin part 200, and can also melt during laser welding to act as a filler material.

[0076] One side of either the first heat dissipating fin support 110 or the second heat dissipating fin support 120 melts during laser welding to act as a filler material. In this case, if the thickness t2 of the first heat dissipating fin support 110 and the thickness t3 of the second heat dissipating fin support 120 are greater than 1.1 times the thickness t1 of each of the plurality of heat dissipating fin sections 200, they will not function as a filler material during laser welding. If the thickness t2 of the first heat dissipating fin support 110 and the thickness t3 of the second heat dissipating fin support 120 are less than 0.7 times the thickness t1 of each of the plurality of heat dissipating fin sections 200, there will be a problem of insufficient rigidity to support the heat dissipating fin sections 200, i.e., rigidity on the side opposite the welded portion. Therefore, it is preferable that the thickness t2 of the first heat dissipating fin support 110 and the thickness t3 of the second heat dissipating fin support 120 be 0.7 to 1.1 times the thickness t1 of each of the plurality of heat dissipating fin sections 200.

[0077] Furthermore, the height h of first heat dissipation fin support portion 110 and the height h of second heat dissipation fin support portion 120 may be formed to be one to two times the thickness t1 of each of the plurality of heat dissipation fin portions 200.

[0078] 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 t1 of each of the plurality of heat dissipating fin portions 200, the rigidity to support both sides of each of the plurality of heat dissipating fin portions 200 may be insufficient, and 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 more than twice the thickness t1 of each of the plurality of heat dissipating fin portions 200, this may result in a decrease in the heat dissipation effect. Therefore, it is preferable that 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 be formed to be 1 to 2 times the thickness t1 of each of the plurality of heat dissipating fin portions 200.

[0079] The support block 130 may be formed to protrude from the heat dissipation surface 102 of the heat sink body 100. The support block 130 may connect the lower ends of the first and second heat dissipation fin support parts 110 and 120 to the heat dissipation surface 102 of the heat sink body 100. The first and second heat dissipation fin support parts 110 and 120 may be formed to protrude from end parts of the support block 130.

[0080] The minimum thickness of the support block portion 130 is formed to be 2.4 to 3.3 times the thickness t1 of each of the multiple heat dissipation fin portions 200, which is a thickness that allows the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 to be stably formed at the end portion on the support block portion 130 and does not affect the spacing between the multiple heat dissipation fin portions 200.

[0081] That is, if the minimum thickness t4 of the support block 130 is less than 2.4 times the thickness t1 of each of the plurality of heat dissipation fin sections 200, the thickness t2 of the first heat dissipation fin support section 110 and the thickness t3 of the second heat dissipation fin support section 120 cannot be sufficiently formed, and if the thickness t4 of the support block 130 is more than 3.3 times the thickness t1 of each of the plurality of heat dissipation fin sections 200, the number of the plurality of heat dissipation fin sections 200 provided on the heat sink main body 100 may be too small, resulting in reduced heat dissipation performance. Therefore, it is preferable that the thickness t4 of the support block 130 be 2.4 to 3.3 times the thickness t1 of each of the plurality of heat dissipation fin sections 200.

[0082] The support block portion 130 positions the heat dissipation fin portion 200 at a distance on the heat dissipation surface 102 of the heat sink body portion 100, and positions the laser welding portion at a pre-designed height or higher on the heat dissipation surface 102 of the heat sink body portion 100, thereby preventing the mounting surface 101 of the heat sink body portion 100 from warping due to heat after laser welding.

[0083] During laser welding, either the first heat dissipation fin support part 110 or the second heat dissipation fin support part 120 acts as a filler material that melts together with the heat dissipation fin part 200, and after laser welding, the heat dissipation fin part 200 can be fixed between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 by laser welding.

[0084] After the heat dissipation fin section 200 is inserted between the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120, laser welding is performed on one side of either the first heat dissipation fin support section 110 or the second heat dissipation fin support section 120, so that the heat dissipation fin section 200 can be firmly fixed between the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120.

[0085] 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, increasing the rigidity in all directions on both sides and allowing it to be firmly fixed on the heat dissipation surface 102 of the heat sink main body portion 100.

[0086] FIG. 8 is a diagram showing a heat sink structure according to another embodiment of the present invention.

[0087] 8, in a heat sink structure according to another embodiment of the present invention, welded connection protrusions 210 formed at the lower end of each of the plurality of heat dissipating fin units 200 may protrude to one side from the lower end of each of the plurality of heat dissipating fin units 200. In this embodiment, the welded connection protrusions 210 may protrude to one side from the lower end of each of the plurality of heat dissipating fin units 200 and be bent, so that the overall shape formed by the heat dissipating fin units 200 and the welded connection protrusions 210 may be L-shaped.

[0088] Furthermore, in a heat sink structure according to another embodiment of the present invention, the heights of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be different from each other. That is, the height of the first heat dissipation fin support portion 110 may be higher than the height of the second heat dissipation fin support portion 120, and the height of the second heat dissipation fin support portion 120 may be shorter than the height of the first heat dissipation fin support portion 110.

[0089] The welding protrusion 210 can be inserted between the first heat dissipating fin support part 110 and the second heat dissipating fin support part 120, and one side of the welding protrusion 210 can be laser-welded to one side of the second heat dissipating fin support part 120. One side of the lower end of the heat dissipating fin part 200, which is located opposite to the welding protrusion 210, can be supported by one side of the first heat dissipating fin support part 110.

[0090] The second heat dissipation fin support 120 formed at any one of the welded joints 107 may be integrally formed with the first heat dissipation fin support 110 formed at the welded joint 107 adjacent to the one of the welded joints 107. However, the second heat dissipation fin support 120 formed at any one of the welded joints 107 may be formed spaced apart from the first heat dissipation fin support 110 formed at the adjacent welded joint 107.

[0091] Meanwhile, the manufacturing method of the heat sink structure 1 according to the present invention may include a preparation step and a laser welding step.

[0092] In the preparation step, the heat sink body 100 and the plurality of heat dissipation fins 200 can be manufactured separately.

[0093] The laser welding step may be performed after the preparation step. In the laser welding step, the plurality of heat dissipation fins 200 may be fixed to the heat dissipation surface 102 of the heat sink body 100 by laser welding while being spaced apart from each other.

[0094] In the preparation step, the heat sink body 100 may be manufactured by casting, and the plurality of heat dissipation fins 200 may be manufactured by cutting a pre-manufactured metal plate. Here, the pre-manufactured metal plate may be an aluminum plate or an aluminum alloy plate.

[0095] In the laser welding step, the plurality of heat dissipation fin sections 200 are each erected and the lower end of each of the plurality of heat dissipation fin sections 200 is placed on the heat dissipation surface 102, and a laser is then irradiated at an angle between one side of each of the plurality of heat dissipation fin sections 200 and the heat dissipation surface 102, thereby fixing the heat dissipation fin sections 200 to the heat dissipation surface 102 by laser welding.

[0096] In the preparation step, a plurality of weld joints 107 may be formed on the heat dissipation surface 102 of the heat sink body 100, and a weld joint protrusion 210 may be formed on the lower end of each of the plurality of heat dissipation fins 200. In the laser welding step, the weld joint protrusions 210 may be laser-welded to the plurality of weld joints 107, respectively.

[0097] Specifically, in the preparation step, the heat sink body 100 may be manufactured by casting, and the first heat dissipation fin support part 110 may be formed to protrude from the heat dissipation surface 102 of the heat sink body 100. In this case, in the laser welding step, the welded connection protrusion 210 may be erected on the heat dissipation surface 102 at one side of the first heat dissipation fin support part 110, and one side of the welded connection protrusion 210 may be connected to one side of the first heat dissipation fin support part 110 by laser welding.

[0098] Alternatively, in the preparation step, the heat sink body 100 may be manufactured by casting, and the first and second heat dissipation fin support parts 110 and 120 may be formed to protrude apart from each other on the heat dissipation surface 102 of the heat sink body 100. In this case, in the laser welding step, the welded connection protrusion 210 may be inserted between the first and second heat dissipation fin support parts 110 and 120 and erected on the heat dissipation surface 102, and at least one side of the welded connection protrusion 210 may be laser welded to one side of at least one of the first and second heat dissipation fin support parts 110 and 120.

[0099] Alternatively, in the preparation step, the heat sink body 100 may be manufactured by casting, and the support block 130 may be formed to protrude from the heat dissipation surface 102 of the heat sink body 100. In this case, in the laser welding step, the welding protrusion 210 may be erected on the support block 130, and at least one side of the welding protrusion 210 may be laser-welded to the support block 130.

[0100] Alternatively, in the preparation step, the heat sink body 100 may be manufactured by casting, and the support block 130 may be formed to protrude from the heat dissipation surface 102 of the heat sink body 100. The first heat dissipation fin support 110 may be formed to protrude from one end of the support block 130, and the second heat dissipation fin support 120 may be formed to protrude from the other end of the support block 130, spaced apart from the first heat dissipation fin support 110. In this case, in the laser welding step, the weld connection protrusion 210 may be inserted between the first heat dissipation fin support 110 and the second heat dissipation fin support 120 and stand on the support block 130. At least one side of the weld connection protrusion 210 may be laser-welded to one side of at least one of the first heat dissipation fin support 110 and the second heat dissipation fin support 120.

[0101] Meanwhile, the welded joint protrusion 210 does not necessarily have to be formed on the lower end of each of the plurality of heat dissipation fin units 200. That is, the welded joint protrusion 210 does not necessarily have to be formed on the lower end of each of the plurality of heat dissipation fin units 200, and in this case, the lower end of each of the plurality of heat dissipation fin units 200 may be directly laser welded onto the heat dissipation surface 102 or directly laser welded to the weld joint 107.

[0102] For example, the preparation step may include manufacturing the heat sink body 100 by casting and manufacturing the first and second heat dissipation fin support parts 110 and 120 by protruding them from the heat dissipation surface 102, and the laser welding step may include a heat dissipation fin assembly step of inserting the lower end of the heat dissipation fin part 200 between the first and second heat dissipation fin support parts 110 and 120, and the laser welding step may include a heat dissipation fin welding step of laser welding the lower end of the heat dissipation fin part 200 by irradiating a laser from one side of either the first or second heat dissipation fin support part 110 or 120 after the heat dissipation fin assembly step.

[0103] More specifically, the heat dissipation fin welding step involves irradiating a laser at an angle to one of the area between the first heat dissipation fin support part 110 and the lower end of the heat dissipation fin part 200 and the area between the second heat dissipation fin support part 120 and the lower end of the heat dissipation fin part 200, or irradiating a laser at an angle to the area between the first heat dissipation fin support part 110 and the lower end of the heat dissipation fin part 200 and the area between the second heat dissipation fin support part 120 and the lower end of the heat dissipation fin part 200 simultaneously, thereby fixing the lower end of the heat dissipation fin part 200 by laser welding.

[0104] Figure 9 is a photograph of a first test example in which a heat dissipation fin portion 200 was laser welded in the manufacturing method of the heat sink structure 1 according to the present invention. In the first test example, a straight-shaped heat dissipation fin portion 200 having a thickness of 1 mm was placed upright on the heat dissipation surface 102 of a heat sink main body portion 100 having a thickness of 2 mm, and fillet welding was carried out.

[0105] Table 1 below shows examples of laser welding conditions in the first test example, in which laser welding was carried out with the minimum heat input (output) set.

[0106] [Table 1]

[0107] FIG. 9(a) is a photograph showing an enlarged view of the welded portion, and FIG. 9(b) is a photograph showing the bottom surface of the heat sink body 100 after welding.

[0108] Referring to (a) of Figure 9, when the lower end of the 1 mm thick, straight-shaped heat dissipation fin portion 200 is placed directly on the heat dissipation surface 102 of the heat sink main body portion 100 and one side of the heat dissipation fin portion 200 is fixed by laser welding, it can be seen that the rigidity of the laser-welded welded portion is ensured, but the rigidity of the heat dissipation fin portion 200 on the opposite side of the welded portion is difficult to ensure.

[0109] In this case, the heat dissipation fin portion 200 may be damaged during use due to insufficient fixing force against the force generated from the welded portion side to the opposite side of the welded portion. To prevent this, it is necessary to perform laser welding on both sides of the heat dissipation fin portion 200, which is a hassle.

[0110] Furthermore, referring to (b) of Figure 9, when the lower end of the 1 mm thick, straight-shaped heat dissipation fin portion 200 is placed directly on the heat dissipation surface 102 of the heat sink main body 100 and one side of the heat dissipation fin portion 200 is laser welded, even when the minimum heat input (output) is set and laser welding is performed, it can be confirmed that warpage deformation occurs within the dotted line area indicated by drawing symbol A on the mounting surface 101, which is the bottom surface of the heat sink main body 100.

[0111] Figure 10 is a photograph of a second test example in which the heat dissipation fin section 200 was laser welded in the heat sink manufacturing method according to the present invention. In the second test example, the support block section 130 protrudes 2 mm above the heat dissipation surface of the heat sink main body section 100, and the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120, each 1 mm thick, protrude above the support block section 130. The lower end of the 1 mm thick, straight-shaped heat dissipation fin section 200 was inserted between the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120, and a laser was irradiated at an angle between the second heat dissipation fin support section 120 and the heat dissipation fin section 200 to perform fillet welding.

[0112] Table 2 below shows examples of laser welding conditions in the second test example, in which laser welding was carried out with a larger heat input (output) than in the first test example.

[0113] [Table 2]

[0114] FIG. 10(a) is a photograph showing an enlarged view of the welded portion, and FIG. 10(b) is a photograph showing the bottom surface of the heat sink body 100 after welding.

[0115] 10(a), it can be seen that the first heat dissipation fin support part 110 supports the side of the heat dissipation fin part 200 that is not laser welded, thereby reinforcing the rigidity of the side opposite to the laser welded portion, and that the second heat dissipation fin support part 120 melts a portion of its upper side during laser welding to act as a filler material and further increase the rigidity of the laser welded portion. Also, it can be seen in FIG. 10(b), it can be seen that no warpage occurs in the mounting surface 101, which is the bottom surface of the heat sink body 100.

[0116] As described above, in the heat sink structure 1 and its manufacturing method according to an embodiment of the present invention, the heat sink main body 100 and the plurality of heat dissipation fin portions 200 are manufactured separately, and then the plurality of heat dissipation fin portions 200 are fixed to the heat sink main body 100 by laser welding, and the plurality of heat dissipation fin portions 200 are formed into thin, long plates compared to the heat sink main body 100, thereby ensuring a sufficient heat dissipation surface and improving heat dissipation efficiency.

[0117] In addition, the heat sink structure 1 and its manufacturing method according to an embodiment of the present invention manufacture the heat sink body 100 and the plurality of heat dissipation fins 200 separately, and then fix the plurality of heat dissipation fins 200 to the heat sink body 100 by laser welding, thereby minimizing the thickness and spacing of the plurality of heat dissipation fins 200 and significantly reducing manufacturing costs.

[0118] Those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not limiting. The scope of the present invention is defined by the claims that follow rather than the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be construed as being within the scope of the present invention. [Industrial Applicability]

[0119] The present invention provides a heat sink structure and a method for manufacturing the same, in which a heat sink main body and multiple heat dissipation fin portions are manufactured separately, and then the multiple heat dissipation fin portions are fixed to the heat sink main body by laser welding, and the multiple heat dissipation fin portions are formed into thin, long plates compared to the heat sink main body, thereby ensuring a sufficient heat dissipation surface and improving heat dissipation efficiency. [Explanation of symbols]

[0120] 100: heat sink main body, 101: mounting surface 102: heat dissipation surface, 105: accommodation space 107: Welded joint, 110: First heat dissipation fin support 120: second heat dissipation fin support portion, 130: support block portion 200: heat dissipation fin portion, 210: welding joint protrusion

Claims

1. a heat sink body having a mounting surface on one side on which a product to be dissipated is positioned and a heat dissipation surface on a side different from the mounting surface for dissipating heat; a plurality of heat dissipation fin portions that are erected on the heat dissipation surface of the heat sink main body and joined by laser welding.

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

3. The heat sink structure according to claim 2 , wherein a welding protrusion is formed at a lower end of each of the plurality of heat dissipation fin portions, the welding protrusion being laser-welded to each of the plurality of welding joint portions and having a thickness greater than that of each of the plurality of heat dissipation fin portions.

4. The heat sink structure of claim 2, wherein the plurality of welded joints are formed in a concave rounded shape on both sides of the starting end of the portion protruding from the heat dissipation surface of the heat sink main body, and in a bulged rounded shape on both sides of the end of the protruding direction.

5. Each of the plurality of welded joints includes a first heat dissipation fin support portion protruding from the heat dissipation surface, 4. The heat sink structure of claim 3, wherein the welding connection protrusion is erected on the heat dissipation surface at one side of the first heat dissipation fin support portion, and one side of the welding connection protrusion is laser welded to one side of the first heat dissipation fin support portion.

6. Each of the plurality of welded joints includes a first heat dissipation fin support portion and a second heat dissipation fin support portion that are protruded from the heat dissipation surface, 4. The heat sink structure of claim 3, wherein the welding connection protrusion is inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and stands on the heat dissipation surface, and at least one side of the welding connection protrusion is laser welded to one side of at least one of the first heat dissipation fin support portion and the second heat dissipation fin support portion.

7. Each of the plurality of welded joints includes a support block portion formed to protrude from the heat dissipation surface, The heat sink structure according to claim 3 , wherein the welding projection is erected on the support block portion, and at least one side of the welding projection is laser-welded to the support block portion.

8. Each of the plurality of welded joints is a support block portion formed to protrude from the heat dissipation surface; a first heat radiation fin support portion formed to protrude from one end of the support block portion; a second heat radiation fin support portion formed at another end of the support block portion and spaced apart from the first heat radiation fin support portion, 4. The heat sink structure of claim 3, wherein the welding connection protrusion is inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and stands on the support block portion, and at least one side of the welding connection protrusion is laser welded to one side of at least one of the first heat dissipation fin support portion and the second heat dissipation fin support portion.

9. The heat sink structure according to claim 5 , wherein one side of the first heat dissipation fin support portion and one side of the welding connection protrusion are formed in a convex round shape.

10. The heat sink structure of claim 6 , wherein at least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion and at least one side of the welding projection are formed in a convex round shape.

11. The heat sink structure according to claim 7 , wherein at least one side of the welding projection is formed in a convex round shape.

12. The heat sink structure of claim 8 , wherein at least one side of the first heat dissipation fin support and the second heat dissipation fin support and at least one side of the welding projection are formed in a convex round shape.

13. The heat sink structure according to any one of claims 9 to 12, wherein the bulging round shape is a shape that allows the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin portions during the laser welding.

14. a thickness of the first heat dissipation fin support portion is formed to be 0.7 to 1.1 times a thickness of each of the plurality of heat dissipation fin portions; 6. The heat sink structure according to claim 5, wherein the height of the first heat dissipation fin support portion is formed to be one to two times the thickness of each of the plurality of heat dissipation fin portions.

15. a thickness of the first heat dissipation fin support portion and a thickness of the second heat dissipation fin support portion are formed to be 0.7 to 1.1 times a thickness of each of the plurality of heat dissipation fin portions; 7. The heat sink structure according to claim 6, wherein the height of the first heat dissipation fin support portion and the height of the second heat dissipation fin support portion are formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

16. 8. The heat sink structure according to claim 7, wherein the minimum thickness of the support block portion is 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

17. a thickness of the first heat dissipation fin support portion and a thickness of the second heat dissipation fin support portion are formed to be 0.7 to 1.1 times a thickness of each of the plurality of heat dissipation fin portions; a height of the first heat dissipation fin support portion and a height of the second heat dissipation fin support portion are formed to be 1 to 2 times a thickness of each of the plurality of heat dissipation fin portions; 9. The heat sink structure according to claim 8, wherein the minimum thickness of the support block portion is 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

18. a preparation step of separately manufacturing a heat sink body having a mounting surface on one side on which a product to be dissipated is positioned and a heat dissipation surface on a side different from the mounting surface for dissipating heat, and a plurality of heat dissipation fins for dissipating heat; and a laser welding step of fixing the plurality of heat dissipation fin portions to the heat dissipation surface of the heat sink body portion by laser welding while spaced apart from each other.

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

20. In the preparation step, a plurality of welded joints are protrusively formed on the heat dissipation surface of the heat sink body, and a welded joint protrusion having a thickness greater than that of each of the plurality of heat dissipation fins is formed at a lower end of each of the plurality of heat dissipation fins. The method for manufacturing a heat sink structure according to claim 18 , wherein in the laser welding step, the welded joint projections are joined to the plurality of welded joint portions by laser welding.

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