Heat sink structure and method for manufacturing the same

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 thereof, and more particularly, to a heat sink structure in which heat radiation fins are joined to a heat sink body by laser welding.

Background Art

[0002] Generally, a heat sink is provided in a product that requires heat dissipation to effectively dissipate heat.

[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 and enable stable operation, and is deformed into various forms suitable for the products and applied.

[0004] Usually, the heat sink has a structure in which a plurality of heat radiation fins erected on the opposite side of the mounting surface are provided 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 radiation fins and air.

[0005] Korean Registered Patent Publication No. 10-0381303 (announcement date: April 26, 2003) (hereinafter referred to as "the 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 radiation plate, which is the heat sink body, and the plurality of heat radiation fins are integrally formed.

[0007] However, conventional heat sinks are manufactured by extrusion or casting, and the heat sink plate and the plurality of heat sink fins are integrally formed. As a result, it is difficult to reduce the thickness and spacing of the plurality of heat sink fins, and the number of heat sink fins is reduced, which limits the heat dissipation performance and makes it difficult to reduce the weight.

[0008] Furthermore, since the conventional heat sinks are manufactured by extrusion or casting, the molds required to form the multiple heat dissipation fins are complexly designed, resulting in high manufacturing costs. Additionally, separate molds must be manufactured to suit the specific form of each product, which leads to significant time spent on mold design and manufacturing, and a high defect rate during manufacturing.

[0009] In particular, since the conventional heat sinks are manufactured by extrusion or casting, the heat dissipation fins cannot be made thinner and longer than the heat sink body, which has resulted in a decrease in heat dissipation efficiency. [Overview of the project] [Problems that the invention aims to solve]

[0010] The technical problem of the present invention is to provide a heat sink structure and a method for manufacturing the same, in which the heat sink body and a 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 forming the plurality of heat dissipation fins into a thin and long plate shape compared to the heat sink body, and thereby improving heat dissipation efficiency by securing a sufficient heat dissipation surface.

[0011] Another technical problem of the present invention is to provide a heat sink structure and a method for manufacturing the same, in which the heat sink body and heat dissipation fins are manufactured separately, and then the heat dissipation fins are fixed to the heat sink body by laser welding, thereby minimizing the thickness and spacing of the heat dissipation fins and significantly reducing manufacturing costs.

[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 objectives, the heat sink structure according to the present invention comprises a heat sink body and a plurality of heat dissipation fins. One surface of the heat sink body is provided as a mounting surface on which the product to be subjected to heat dissipation is positioned. Another surface of the heat sink body, different from the aforementioned surface, is provided as a heat dissipation surface for releasing heat. The plurality of heat dissipation fins are erected on the heat dissipation surface of the heat sink body and joined together by laser welding.

[0014] Multiple welded joints may be formed protruding from the heat dissipation surface of the heat sink body, with each of the multiple heat dissipation fins being joined by laser welding.

[0015] A welded joint projection may be formed at the lower end of each of the plurality of heat dissipation fin portions, which is joined to the plurality of welded joint portions by laser welding. The welded joint projection may be formed to be thicker than the thickness of each of the plurality of heat dissipation fin portions.

[0016] The plurality of welded joints may be formed in a rounded shape with recessed sides on both sides of the starting end of the portion that protrudes from the heat dissipation surface of the heat sink body. The plurality of welded joints may also be formed in a rounded shape with bulging sides on both sides of the end in the protruding direction.

[0017] Each of the plurality of welded joints may be composed of 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 projection may be erected on the heat dissipation surface on one side of the first heat dissipation fin support. One side of the welded joint projection can be joined to one side of the first heat dissipation fin support by laser welding.

[0018] Each of the plurality of welded joints may consist of a first heat dissipation fin support and a second heat dissipation fin support. It may be inserted between the first heat dissipation fin support and the second heat dissipation fin support and erected on the heat dissipation surface. At least one side of the welded joint projection can be joined by laser welding to at least one side of the first heat dissipation fin support and the second heat dissipation fin support.

[0019] Each of the plurality of welded joints may be composed of a support block. The support block may be formed to protrude from the heat dissipation surface. The welded joint projection may be erected on the support block. At least one side of the welded joint projection can be joined to the support block by laser welding.

[0020] Each of the plurality of welded joints may consist of a support block, a first heat dissipation fin support, and a second heat dissipation fin support. The support block may be formed to protrude from the heat dissipation surface. The first heat dissipation fin support may be formed to protrude from one end of the support block. The second heat dissipation fin support may be formed to protrude from the other end of the support block, spaced apart from the first heat dissipation fin support. The welded joint projection may be inserted between the first heat dissipation fin support and the second heat dissipation fin support and erected on the support block. At least one side of the welded joint projection can be joined by laser welding to at least one side of the first heat dissipation fin support and the second heat dissipation fin support.

[0021] One side of the first heat dissipation fin support portion and one side of the welded joint projection may be formed in a bulging, rounded 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 welded joint projection, may be formed in a bulging round shape.

[0023] At least one side of the welded joint projection may be formed in a bulging, rounded shape.

[0024] The bulged round shape may be a shape that allows the laser to be irradiated at an angle of 3 to 7° with respect 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 formed to 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 may be formed to 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 formed to 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 formed to 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 formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

[0028] 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 where 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 function to dissipate heat. 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.

[0029] 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.

[0030] In the preparation step, a plurality of welded joints may be formed protruding from the heat dissipation surface of the heat sink body. In the preparation step, a welded joint projection thicker than the thickness of each of the plurality of heat dissipation fins may be formed at the lower end of each of the plurality of heat dissipation fins. In the laser welding step, the welded joint projections can be joined to each of the plurality of welded joints by laser welding.

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

[0032] The heat sink structure and its manufacturing method according to the present invention involve separately manufacturing the heat sink body and a plurality of heat dissipation fins, then fixing the plurality of heat dissipation fins to the heat sink body by laser welding, thereby forming the plurality of heat dissipation fins into a thin and elongated plate shape compared to the heat sink body, which has the effect of improving heat dissipation efficiency by ensuring a sufficient heat dissipation surface.

[0033] Furthermore, the heat sink structure and its manufacturing method according to the present invention have the effect of significantly reducing manufacturing costs by minimizing the thickness and spacing of the heat sink fins after separately manufacturing the heat sink body and the plurality of heat dissipation fins, and then fixing the plurality of heat dissipation fins to the heat sink body by laser welding.

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

[0035] [Figure 1] This is a perspective view showing a heat sink structure according to an embodiment of the present invention. [Figure 2] Figure 1 is a rear perspective view. [Figure 3] Figure 2 is an exploded perspective view showing the heatsink body and multiple heat dissipation fins. [Figure 4] This is a partially enlarged view of Figure 2. [Figure 5] These are partial plan views of Figures 1 and 2. [Figure 6] This is a partially enlarged view of Figure 5. [Figure 7] Figure 6 is an exploded view. [Figure 8] This figure shows a heat sink structure according to another embodiment of the present invention. [Figure 9] This is a photograph of a first test example in which the heat dissipation fin portion was laser-welded in the manufacturing method of the heat sink structure according to the present invention. [Figure 10] This is a photograph of a second test example in which the heat dissipation fin portion was laser-welded in the manufacturing method of the heat sink structure according to the present invention. [Modes for carrying out the invention]

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

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

[0038] Referring to Figures 1 to 7, the heat sink structure 1 according to an embodiment of the present invention may include a heat sink body portion 100 and a plurality of heat dissipation fin portions 200.

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

[0040] One side of the heat sink body 100 may be provided with a mounting surface 101 on which the product to be heated is positioned. Here, the product may include electronic components that generate a predetermined amount of heat while operating when power is supplied. That is, the product may be a printed circuit board on which Rx and Tx elements responsible for signal output and transmission in an antenna device are mounted, or it may be a casing housing the printed circuit board.

[0041] Therefore, a storage space 105 for accommodating the product may be formed on the mounting surface 101 of the heat sink body 100. However, the storage space 105 is not necessarily required, 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 side of the heat sink body 100 may be a heat dissipation surface 102 to which a plurality of heat dissipation fins 200 that perform heat dissipation through heat exchange are fixed.

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

[0044] The multiple heat dissipation fins 200 can perform a heat dissipation function to dissipate the heat generated by the product to the outside of the heat sink body 100. The multiple heat dissipation fins 200 may be formed in a plate shape that is thinner than the heat sink body 100. The length L1 of each of the multiple heat dissipation fins 200 may be longer than the length L2 from the mounting surface 101 to the heat dissipation surface 102 of the heat sink body 100. The multiple heat dissipation fins 200 may have a straight panel shape as one example, but can also be manufactured in a variety of 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, for example, made of aluminum or an aluminum alloy, but can also be made of a variety of other known materials with excellent thermal conductivity used for manufacturing heat sinks.

[0046] For example, the heat sink body 100 is manufactured by casting in a pre-designed shape, and the heat dissipation fins 200 are manufactured by cutting a flat, straight aluminum or aluminum alloy panel to a pre-designed size.

[0047] Multiple welded joints 107 may be formed protruding from the heat dissipation surface 102 of the heat sink body 100, with each of the multiple heat dissipation fins 200 being joined by laser welding.

[0048] However, a welded joint 107 does not need to be formed on the heat dissipation surface 102 of the heat sink body 100. In this case, the multiple heat dissipation fins 200 can be positioned to stand upright and rest on the heat dissipation surface 102 of the heat sink body 100. While resting on the heat dissipation surface 102 of the heat sink body 100, they can be fixed to the heat dissipation surface 102 of the heat sink body 100 by laser welding.

[0049] In laser welding, with the end of the heat dissipation fin portion 200 resting on the heat dissipation surface 102 of the heat sink body portion 100, a laser is irradiated onto the boundary line between the heat sink body portion 100 and the heat dissipation fin portion 200, that is, 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 body portion 100 by laser welding.

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

[0051] Specifically, the multiple welded joints 107 may be formed such that their width decreases as they protrude from the heat dissipation surface 102 of the heat sink body 100 towards the end. This allows laser welding to be performed even at a low laser irradiation angle, and thus the spacing between the multiple heat dissipation fins 200 on the heat dissipation surface 102 of the heat sink body 100 can be narrowed, and the number of heat dissipation fins 200 can be increased to improve heat dissipation performance.

[0052] Referring to Figures 6 and 7, the multiple welded joints 107 may be formed with rounded shapes R1 and R2, where both sides of the starting end of the portion protruding from the heat dissipation surface 102 of the heat sink body 100 are recessed. Alternatively, the multiple welded joints 107 may be formed with rounded shapes R3 and R4, where both sides of the end in the protruding direction are bulging. The radii of curvature of the rounded shapes R1 and R2 may be the same as those of the rounded shapes R3 and R4. The radii of curvature of the rounded shapes R1 and R2 may be larger than those of the rounded shapes R3 and R4.

[0053] A welded joint projection 210 may be formed at the lower end of each of the multiple heat dissipation fin sections 200, which is joined to the welded joint section 107 by laser welding. The welded joint projection 210 may be formed to be thicker than the thickness t1 of each of the multiple heat dissipation fin sections 200. The welded joint projection 210 may be formed to protrude from both sides of the lower end of each of the multiple heat dissipation fin sections 200.

[0054] On the other hand, each of the multiple welded joints 107 may include a first heat dissipation fin support portion 110, a second heat dissipation fin support portion 120, and a support block portion 130. However, the welded joint 107 may be formed by the first heat dissipation fin support portion 110 alone, by the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 alone, or by the support block portion 130 alone.

[0055] When each of the multiple welded 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 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 from both ends of the support block portion 130, spaced apart from each other. 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 from the other end of the support block portion 130, spaced apart from the first heat dissipation fin support portion 110.

[0056] In this case, the weldable joint projection 210 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and erected on the support block portion 130, and at least one side of the weldable joint projection 210 can be joined by laser welding to at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0057] Furthermore, at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and at least one side of the welded joint projection 210 may be formed into bulging round shapes R5, R6, R7, and R8. Here, the bulging round shapes R5, R6, R7, and R8 may be shaped so that the laser can be irradiated at an angle of 3 to 7° to each of the multiple heat dissipation fin portions 200 during laser welding.

[0058] During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle of less than 3°, the thickness of the laser welding may be thin and the heat dissipation fin sections 200 may not be firmly bonded to the first heat dissipation fin support section 110. During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle greater than 7°, the spacing between the multiple heat dissipation fin sections 200 will widen and the number of multiple heat dissipation fin sections 200 will decrease, which may reduce the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5, R6, R7, and R8 are shaped so that the laser can be irradiated at an angle of 3 to 7° during laser welding.

[0059] If each of the multiple welded joints 107 is formed solely 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 102.

[0060] In this case, the welded joint projection 210 may be erected on the heat dissipation surface 102 on one side of the first heat dissipation fin support portion 110, and one side of the welded joint projection 210 can be joined to the one side of the first heat dissipation fin support portion 110 by laser welding.

[0061] Furthermore, one side of the first heat dissipation fin support portion 110 and one side of the welded joint projection 210 may be formed into bulging round shapes R5 and R7. Here, the bulging round shapes R5 and R7 may be shaped so that, during laser welding, the laser can be irradiated at an angle of 3 to 7° to each of the multiple heat dissipation fin portions 200.

[0062] During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle of less than 3°, the thickness of the laser welding may be thin and the heat dissipation fin sections 200 may not be firmly bonded to the first heat dissipation fin support section 110. During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle greater than 7°, the spacing between the multiple heat dissipation fin sections 200 will widen and the number of multiple heat dissipation fin sections 200 will decrease, which may reduce the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5 and R7 are shaped so that the laser can be irradiated at an angle of 3 to 7° during laser welding.

[0063] If 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 weldable joint projection 210 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and erected on the heat dissipation surface 102, and at least one side of the weldable joint projection 210 can be joined by laser welding to at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0065] Furthermore, at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and at least one side of the welded joint projection 210 may be formed into bulging round shapes R5, R6, R7, and R8. Here, the bulging round shapes R5, R6, R7, and R8 may be shaped so that the laser can be irradiated at an angle of 3 to 7° to each of the multiple heat dissipation fin portions 200 during laser welding.

[0066] During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle of less than 3°, the thickness of the laser welding may be thin and the heat dissipation fin sections 200 may not be firmly bonded to the first heat dissipation fin support section 110. During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle greater than 7°, the spacing between the multiple heat dissipation fin sections 200 will widen and the number of multiple heat dissipation fin sections 200 will decrease, which may reduce the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R5, R6, R7, and R8 are shaped so that the laser can be irradiated at an angle of 3 to 7° during laser welding.

[0067] If each of the multiple welded joints 107 is formed solely of a support block portion 130, the support block portion 130 may be formed to protrude onto the heat dissipation surface 102.

[0068] In this case, the weldable projection 210 may be erected on the support block portion 130, and at least one side of the weldable projection 210 can be joined to the support block portion 130 by laser welding.

[0069] Furthermore, at least one side of the welded joint projection 210 may be formed into a bulging round shape R7, R8. Here, the bulging round shapes R7, R8 may be shaped so that the laser can be irradiated at an angle of 3 to 7° to each of the multiple heat dissipation fin portions 200 during laser welding.

[0070] During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle of less than 3°, the thickness of the laser weld may be thin and the heat dissipation fin sections 200 may not be firmly bonded to the first heat dissipation fin support section 110. During laser welding, if the laser can be irradiated to each of the multiple heat dissipation fin sections 200 at an angle greater than 7°, the spacing between the multiple heat dissipation fin sections 200 will widen and the number of multiple heat dissipation fin sections 200 will decrease, which may reduce the heat dissipation performance. Therefore, it is preferable that the bulging round shapes R7 and R8 are shaped so that the laser can be irradiated at an angle of 3 to 7° during laser welding.

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

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

[0073] The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 are spaced apart at a distance of 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 fitted and inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

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

[0075] 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, which is fixed by laser welding, thereby increasing the fixing force of the heat dissipation fin portion 200. They can also melt during laser welding and act as filler material.

[0076] One side of either the first heat dissipation fin support portion 110 or the second heat dissipation fin support portion 120 melts during laser welding and acts as filler material. In this case, if the thickness t2 of the first heat dissipation fin support portion 110 and the thickness t3 of the second heat dissipation fin support portion 120 are more than 1.1 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200, it will be difficult for them to act as filler material during laser welding. Conversely, if the thickness t2 of the first heat dissipation fin support portion 110 and the thickness t3 of the second heat dissipation fin support portion 120 are less than 0.7 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200, there is a problem of insufficient rigidity in supporting the heat dissipation fin portions 200, i.e., in rigidity on the opposite side of the welded area. Therefore, it is preferable that the thickness t2 of the first heat dissipation fin support portion 110 and the thickness t3 of the second heat dissipation fin support portion 120 be formed to be 0.7 to 1.1 times the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0077] Furthermore, 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 may be formed to be 1 to 2 times the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0078] 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 smaller than the thickness t1 of each of the multiple heat dissipation fin portions 200, the rigidity supporting both sides of each of the multiple heat dissipation fin portions 200 may be insufficient. Conversely, 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 t1 of each of the multiple heat dissipation fin portions 200, this may be a factor that reduces the heat dissipation effect. Therefore, it is preferable that 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 formed to be 1 to 2 times the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0079] The support block portion 130 may be formed to protrude from the heat dissipation surface 102 of the heat sink body portion 100. The support block portion 130 can connect the lower ends of the first heat dissipation fin support portion 110 and the lower ends of the second heat dissipation fin support portion 120 to the heat dissipation surface 102 of the heat sink body portion 100. The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to protrude from the ends on the support block portion 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. This thickness allows the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 to be stably formed on the end of the support block portion 130, and is such that it does not affect the spacing between the multiple heat dissipation fin portions 200.

[0081] In other words, if the minimum thickness t4 of the support block portion 130 is less than 2.4 times the thickness t1 of each of the multiple heat dissipation fin portions 200, it will not be possible to sufficiently form the thickness t2 of the first heat dissipation fin support portion 110 and the thickness t3 of the second heat dissipation fin support portion 120. Conversely, if the thickness t4 of the support block portion 130 is greater than 3.3 times the thickness t1 of each of the multiple heat dissipation fin portions 200, there may be a problem in that the number of multiple heat dissipation fin portions 200 provided on the heat sink body portion 100 is small, resulting in reduced heat dissipation performance. Therefore, it is preferable that the thickness t4 of the support block portion 130 be formed to be 2.4 to 3.3 times the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0082] The support block portion 130 is positioned on the heat dissipation surface 102 of the heat sink body portion 100 at a distance from the heat dissipation fin portion 200, and the laser welding area is positioned on the heat dissipation surface 102 of the heat sink body portion 100 at a height above the pre-designed height, 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 portion 110 or the second heat dissipation fin support portion 120 acts as a filler material that melts together with the heat dissipation fin portion 200. After laser welding, the heat dissipation fin portion 200 can be fixed between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 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 to firmly fix it 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 section 200 is supported by the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120, increasing rigidity in both directions and allowing it to be firmly fixed on the heat dissipation surface 102 of the heat sink body section 100.

[0086] Figure 8 shows a heat sink structure according to another embodiment of the present invention.

[0087] Referring to Figure 8, in another embodiment of the present invention, the heat sink structure may have welded joint protrusions 210 formed at the lower end of each of the multiple heat dissipation fin portions 200, which protrude to one side from the lower end of each of the multiple heat dissipation fin portions 200. In this embodiment, the welded joint protrusions 210 may be bent to protrude to one side from the lower end of each of the multiple heat dissipation fin portions 200, so that the overall shape of the heat dissipation fin portions 200 and the welded joint protrusions 210 is formed in an L shape.

[0088] Furthermore, in other embodiments of the present invention, the heat sink structure may be formed with different heights for the first heat fin support portion 110 and the second heat fin support portion 120. That is, the height of the first heat fin support portion 110 may be higher than the height of the second heat fin support portion 120, and the height of the second heat fin support portion 120 may be shorter than the height of the first heat fin support portion 110.

[0089] The weldable joint projection 210 is insertable between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and one side of the weldable joint projection 210 can be laser-welded to one side of the second heat dissipation fin support portion 120. One side of the lower end of the heat dissipation fin portion 200 located on the opposite side of the weldable joint projection 210 can be supported by one side of the first heat dissipation fin support portion 110.

[0090] Furthermore, the second heat dissipation fin support portion 120 formed on any one of the welded joint portions 107 can be formed integrally with the first heat dissipation fin support portion 110 formed on the welded joint portion 107 adjacent to the aforementioned welded joint portion 107. However, the second heat dissipation fin support portion 120 formed on any one of the welded joint portions 107 may be formed separately from the first heat dissipation fin support portion 110 formed on the adjacent welded joint portion 107.

[0091] On the other hand, the method for manufacturing 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 described above, the heat sink body 100 and the multiple 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 multiple heat dissipation fins 200 can be fixed to the heat dissipation surface 102 of the heat sink body 100 by laser welding, spaced apart from each other.

[0094] In the preparation step described above, the heat sink body 100 can be manufactured by casting, and the multiple heat dissipation fins 200 can 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, with each of the multiple heat dissipation fin sections 200 positioned upright and the lower end of each of the multiple heat dissipation fin sections 200 resting on the heat dissipation surface 102, the laser is irradiated at an angle between one side of each of the multiple heat dissipation fin sections 200 and the heat dissipation surface 102, thereby fixing the heat dissipation fin sections 200 onto the heat dissipation surface 102 by laser welding.

[0096] Furthermore, in the preparation step, a plurality of welded joint portions 107 may be formed protruding from the heat dissipation surface 102 of the heat sink body portion 100, and welded joint protrusions 210 may be formed at the lower end of each of the plurality of heat dissipation fin portions 200. Then, in the laser welding step, the welded joint protrusions 210 can be joined to each of the plurality of welded joint portions 107 by laser welding.

[0097] To explain in more detail, in the preparation step, the heat sink body 100 may be manufactured by casting, and the first heat sink fin support portion 110 may be formed protruding from the heat sink body 100's heat sink surface 102. In this case, in the laser welding step, the weldable joint projection 210 may be erected on the heat sink surface 102 on one side of the first heat sink fin support portion 110, and one side of the weldable joint projection 210 can be joined to one side of the first heat sink fin support portion 110 by laser welding.

[0098] Alternatively, in the preparation step, the heat sink body 100 may be manufactured by casting, and the first heat fin support portion 110 and the second heat fin support portion 120 may be formed protruding from the heat dissipation surface 102 of the heat sink body 100, spaced apart from each other. In this case, in the laser welding step, the weldable joint projection 210 may be inserted between the first heat fin support portion 110 and the second heat fin support portion 120 and erected on the heat dissipation surface 102, and at least one side of the weldable joint projection 210 can be joined by laser welding to at least one side of the first heat fin support portion 110 and the second heat fin support portion 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 protruding from the heat dissipation surface 102 of the heat sink body 100. In this case, in the laser welding step, the weldable joint projection 210 may be erected on the support block 130, and at least one side of the weldable joint projection 210 can be joined to the support block 130 by laser welding.

[0100] Alternatively, in the preparation step, the heat sink body portion 100 may be manufactured by casting, and a support block portion 130 may be formed protruding from the heat dissipation surface 102 of the heat sink body portion 100, and a first heat dissipation fin support portion 110 may be formed protruding from one end of the support block portion 130, or a second heat dissipation fin support portion 120 may be formed protruding from the other end of the support block portion 130, separated from the first heat dissipation fin support portion 110. In this case, in the laser welding step, the weldable coupling projection 210 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and erected on the support block portion 130, and at least one side of the weldable coupling projection 210 can be joined by laser welding to at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0101] On the other hand, welded joint protrusions 210 are not necessarily formed at the lower end of each of the multiple heat dissipation fin sections 200. That is, welded joint protrusions 210 do not need to be formed at the lower end of each of the multiple heat dissipation fin sections 200, and in this case, the lower end of each of the multiple heat dissipation fin sections 200 may be directly joined to the heat dissipation surface 102 by laser welding, or directly joined to the welded joint section 107 by laser welding.

[0102] For example, the preparation step may include manufacturing the heat sink body 100 by casting and manufacturing the first heat fin support portion 110 and the second heat fin support portion 120 protruding from the heat dissipation surface 102, and the laser welding step may include a heat fin assembly step in which the lower end of the heat fin portion 200 is inserted between the first heat fin support portion 110 and the second heat fin support portion 120, and the laser welding step may include a heat fin welding step after the heat fin assembly step in which a laser is irradiated from one side of either the first heat fin support portion 110 or the second heat fin support portion 120 to laser weld the lower end of the heat fin portion 200.

[0103] More specifically, the heat dissipation fin welding step involves irradiating the lower end of the heat dissipation fin 200 by laser welding by tilting the laser to either the space between the first heat dissipation fin support 110 and the lower end of the heat dissipation fin 200, or the space between the second heat dissipation fin support 120 and the lower end of the heat dissipation fin 200, or by simultaneously irradiating the space between the first heat dissipation fin support 110 and the lower end of the heat dissipation fin 200, and the space between the second heat dissipation fin support 120 and the lower end of the heat dissipation fin 200, thereby fixing the lower end of the heat dissipation fin 200 by laser welding.

[0104] Figure 9 is a photograph of a first test example in which the 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 heat dissipation fin portion 200 with a thickness of 1 mm was erected on the heat dissipation surface 102 of the heat sink body portion 100 with a thickness of 2 mm and fillet welding was carried out.

[0105] Table 1 below illustrates the laser welding conditions in the first test example, showing an example where laser welding was carried out with a minimum heat input (output) set.

[0106] [Table 1]

[0107] Figure 9(a) is a magnified photograph of the welded area, and Figure 9(b) is a photograph of the bottom surface of the heat sink body 100 after welding.

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

[0109] In this case, the heat dissipation fin section 200 lacks sufficient fixing force against forces generated from the welded side toward the opposite side of the welded area, posing a risk of damage during use. To prevent this, the entire surface of both sides of the heat dissipation fin section 200 must be laser-welded, which is an inconvenient requirement.

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

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

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

[0113] [Table 2]

[0114] Figure 10(a) is a magnified photograph of the welded area, and Figure 10(b) is a photograph of the bottom surface of the heat sink body 100 after welding.

[0115] Referring to Figure 10(a), it can be confirmed that the first heat dissipation fin support 110 supports the heat dissipation fin portion 200 that is not laser-welded, thereby reinforcing the rigidity on the opposite side of the laser-welded area, and that the second heat dissipation fin support 120, during laser welding, melts a portion of its upper side to act as filler material, further increasing the rigidity of the laser-welded area. Also, referring to Figure 10(b), it can be confirmed that no warping deformation occurs on the mounting surface 101, which is the bottom surface of the heat sink body portion 100.

[0116] As described above, the heat sink structure 1 and its manufacturing method according to the embodiment of the present invention involve separately manufacturing the heat sink body 100 and the plurality of heat dissipation fins 200, then fixing the plurality of heat dissipation fins 200 to the heat sink body 100 by laser welding, thereby forming the plurality of heat dissipation fins 200 into a thin and long plate shape compared to the heat sink body 100, and improving heat dissipation efficiency by securing a sufficient heat dissipation surface.

[0117] Furthermore, in the embodiment of the present invention, the heat sink structure 1 and its manufacturing method involve separately manufacturing the heat sink body 100 and the multiple heat dissipation fins 200, and then fixing the multiple heat dissipation fins 200 to the heat sink body 100 by laser welding. This minimizes the thickness and spacing of the multiple heat dissipation fins 200, significantly reducing manufacturing costs.

[0118] Those with ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without altering its technical idea or essential features. Therefore, the embodiments described above should be understood to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, which are set forth below, and all modifications or altered forms derived from the meaning and scope of the claims and the concept of equivalents thereto should be interpreted as being included 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 body and a 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 forming the plurality of heat dissipation fins into a thin and elongated plate shape compared to the heat sink body, thereby improving heat dissipation efficiency by ensuring a sufficient heat dissipation surface. [Explanation of Symbols]

[0120] 100: Heatsink body, 101: Mounting surface 102: Heat dissipation surface, 105: Enclosure space 107: Welded joint, 110: First heat dissipation fin support 120: Second heat dissipation fin support section, 130: Support block section 200: Heat dissipation fin section, 210: Welded joint protrusion

Claims

1. A heat sink body having a mounting surface on one side where the product to be heated is positioned, and a heat dissipation surface on a different side for releasing heat, It is a thin, elongated plate-like structure compared to the main body of the heat sink, and comprises a plurality of heat dissipation fins that are erected on the heat dissipation surface, The heat sink body comprises a plurality of protruding portions formed on the heat dissipation surface, and each of the plurality of heat dissipation fin portions is welded and fixed to a plurality of welded joint portions, The welded joint has a thickness greater than the thickness of the heat dissipation fin portion. Each of the multiple heat dissipation fin portions has a welded joint projection formed at its lower end, which is welded to the welded joint portion. Each of the aforementioned plurality of welded joints is A support block portion that protrudes from the heat dissipation surface, A first heat dissipation fin support portion is formed protruding from one end of the support block portion, The support block portion includes a second heat dissipation fin support portion which is formed to protrude from the other end of the support block portion and is spaced apart from the first heat dissipation fin support portion, A heat sink structure in which the welded coupling projection is inserted between the first heat fin support portion and the second heat fin support portion, erected on the support block portion, and at least one side of the welded coupling projection is welded to at least one side of the first heat fin support portion and the second heat fin support portion.

2. The heat sink structure according to claim 1, wherein the plurality of welded joints are formed in a rounded shape with recessed sides on both sides of the starting end of the portion that protrudes from the heat dissipation surface of the heat sink body, and in a rounded shape with bulging sides on both sides of the end in the protruding direction.

3. The heat sink structure according to claim 1, 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 welded joint projection are formed in a bulging round shape.

4. The thickness of the first heat dissipation fin support portion is formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions. The heat sink structure according to claim 1, wherein the height of the first heat dissipation fin support portion is formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin portions.

5. The thickness of the first heat dissipation fin support portion and the thickness of the second heat dissipation fin support portion are formed to be 0.7 to 1.1 times the thickness of each of the plurality of heat dissipation fin portions. The heat sink structure according to claim 1, 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.

6. The heat sink structure according to claim 1, wherein the minimum 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 dissipation fin portions.

7. The thickness of the first heat dissipation fin support portion and the thickness of the second heat dissipation fin support portion are formed to 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 and the height of the second heat dissipation fin support are formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fins. The heat sink structure according to claim 1, wherein the minimum 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 dissipation fin portions.

8. The heat sink body has a mounting surface on one side on which the product to be subjected to heat dissipation is located, and a heat dissipation surface on a different side for releasing heat, and has a plurality of protruding connecting parts formed on the heat dissipation surface, and the preparation step includes separately manufacturing a plurality of heat dissipation fin parts which are thin and long plate-shaped compared to the heat sink body and perform a heat dissipation function, Each of the plurality of welded joints includes a support block portion formed protruding from the heat dissipation surface, a first heat dissipation fin support portion formed protruding from one end of the support block portion, and a second heat dissipation fin support portion formed protruding from the other end of the support block portion at a distance from the first heat dissipation fin support portion. Each of the aforementioned multiple heat dissipation fin sections has a welded joint projection that is thicker than the thickness of the heat dissipation fin section at its lower end. The steps include inserting each of the plurality of heat dissipation fin sections between the first heat dissipation fin support section and the second heat dissipation fin support section of each support block section and erecting them, A method for manufacturing a heat sink structure, further comprising a laser welding step of welding at least one side of the weldable joint projection to at least one side of the first heat sink support and the second heat sink support by laser welding.

9. In the aforementioned preparation step, The heat sink body is manufactured by casting. The method for manufacturing a heat sink structure according to claim 8, wherein the plurality of heat dissipation fin portions are manufactured by cutting a pre-manufactured metal plate.

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