Heat sink structure and method for manufacturing the same

Abstract

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

Description

Technical Field

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

Background Art

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

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

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

[0005] Korean Registered Patent Publication No. 10-0381303 (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 dissipation plate, which is the heat sink body, and the plurality of heat dissipation fins are integrally formed.

[0007] However, conventional heat sinks are manufactured by extrusion or casting, and the heat sink plate and the multiple heat sink fins are formed integrally. As a result, it is difficult to reduce the thickness and spacing of the multiple 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. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The technical problem of the present invention is to provide a heat sink structure and a method for manufacturing the same that can significantly reduce manufacturing costs by minimizing the thickness and spacing of the multiple heat dissipation fins, after separately manufacturing the heat sink body and the multiple heat dissipation fins, and then fixing the multiple heat dissipation fins to the heat sink body by laser welding.

[0010] 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]

[0011] 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 heated 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 fixed by laser welding.

[0012] Multiple welded joints may be formed protruding from the heat dissipation surface of the heat sink body. The multiple heat dissipation fins can each be joined to the multiple welded joints by laser welding.

[0013] 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 lower end of each of the plurality of heat dissipation fins may be erected on the heat dissipation surface on one side of the first heat dissipation fin support. The first heat dissipation fin support can support one side of each of the plurality of heat dissipation fins. The connection between one side of each of the plurality of heat dissipation fins and one side of the first heat dissipation fin support can be fixed by laser welding.

[0014] Each of the plurality of welded joints may consist of a first heat dissipation fin support and a second heat dissipation fin support. The first heat dissipation fin support may be formed to protrude from the heat dissipation surface. The second heat dissipation fin support may be formed to protrude from the heat dissipation surface at a distance from the first heat dissipation fin support. The lower end of each of the plurality of heat dissipation fins may be inserted between the first heat dissipation fin support and the second heat dissipation fin support and erected on the heat dissipation surface. The first heat dissipation fin support can support one side of each of the plurality of heat dissipation fins. The second heat dissipation fin support can support the other side of each of the plurality of heat dissipation fins. One of the following can be fixed by laser welding: the space between one side of each of the plurality of heat dissipation fins and one side of the first heat dissipation fin support, and the space between the other side of each of the plurality of heat dissipation fins and one side of the second heat dissipation fin support.

[0015] 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 lower end of each of the plurality of heat dissipation fins can be erected on the support block and fixed to the support block by laser welding.

[0016] 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 lower end of each of the plurality of heat dissipation fins may be inserted between the first heat dissipation fin support and the second heat dissipation fin support and erected on the support block. The first heat dissipation fin support can support one side of each of the plurality of heat dissipation fins. The second heat dissipation fin support can support the other side of each of the plurality of heat dissipation fins. One of the following can be fixed by laser welding: between one side of each of the plurality of heat dissipation fins and one side of the first heat dissipation fin support, and between the other side of each of the plurality of heat dissipation fins and one side of the second heat dissipation fin support.

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

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

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

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

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

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

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

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

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

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

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

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

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

Effects of the Invention

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

[0031] Further, in the present invention, by manufacturing only the heat sink main body by casting, there is an effect that the production time required and the manufacturing cost can be greatly reduced.

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

Brief Description of the Drawings

[0033] [Figure 1] Bottom perspective view showing an embodiment of a heat sink structure according to the present invention. [Figure 2] Top perspective view showing an embodiment of a heat sink structure according to the present invention. [Figure 3] Side view showing an embodiment of a heat sink structure according to the present invention. [Figure 4] View showing an enlarged part of an embodiment of a heat sink structure according to the present invention. [Figure 5] View showing an enlarged part of an embodiment of a heat sink structure according to the present invention. [Figure 6] View showing an enlarged part of another embodiment of a heat sink structure according to the present invention. [Figure 7] A diagram illustrating another shape of the heat dissipation fin portion in the heat sink structure according to the present invention. [Figure 8] A diagram illustrating another shape of the heat dissipation fin portion in the heat sink structure according to the present invention. [Figure 9] A diagram illustrating another shape of the heat dissipation fin portion in the heat sink structure according to the present invention. [Figure 10] A diagram illustrating another shape of the heat dissipation fin portion in the heat sink structure according to the present invention. [Figure 11] A photograph of the first test example in which the heat dissipation fin portion of the heat sink manufacturing method according to the present invention is laser-welded. [Figure 12] A photograph of a second test example in which the heat dissipation fin portion of the heat sink manufacturing method according to the present invention is laser-welded. [Modes for carrying out the invention]

[0034] The present invention can be modified in various ways and have many different embodiments, but a specific embodiment will be illustrated in the drawings and described in detail.

[0035] However, it should be understood that this does not intend to limit the present invention to any particular embodiment, but rather includes all modifications, equivalents, or substitutions that fall within the spirit and technical scope of the present invention. In describing each drawing, similar reference numerals have been used for similar components.

[0036] When it is mentioned that one component is “linked” or “joined” with another component, it should be understood that this may mean that the other component is directly linked or connected to it, but that other components may be present in between. Conversely, when it is mentioned that one component is “directly linked” or “directly joined” with another component, it should be understood that there are no other components present in between.

[0037] The terms used in this application are used solely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “includes” or “having” are intended to specify the existence of features, figures, stages, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preemptively exclude the possibility of the existence or addition of one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0038] Preferred embodiments of the present invention will be described in more detail below with reference to the attached drawings. Hereafter, the same reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted.

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

[0040] More specifically, Figure 4 shows an example where the heat dissipation fin section 200 is attached to the heat sink body section 100 before laser welding, and Figure 5 shows an example where the heat dissipation fin section 200 is fixed to the heat sink body section 100 after laser welding.

[0041] An embodiment of the heat sink structure 1 according to the present invention will be described in detail below with reference to Figures 1 to 5.

[0042] One embodiment of the heat sink structure 1 according to the present invention includes a heat sink body portion 100, which has a mounting surface 101 on one side on which a product to be subjected to heat dissipation is located.

[0043] In this embodiment, a storage space 105 for accommodating the product can be formed on the mounting surface 101 of the heat sink body 100. However, the heat sink body 100 may be formed in a plate shape in which no storage space 105 is formed.

[0044] The other side of the heat sink body 100 has a heat dissipation surface 102 on which multiple heat dissipation fins 200 that perform heat dissipation through heat exchange are fixed.

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

[0046] The heat dissipation fin section 200 may have a straight panel shape as one example, but it can also be manufactured in a variety of other shapes, such as a curved panel shape or a rod shape.

[0047] The heat sink body 100 and the heat dissipation fins 200 may be manufactured from aluminum or an aluminum alloy, for example, but they can also be manufactured from a variety of other known materials with excellent thermal conductivity used for manufacturing heat sinks.

[0048] For example, the heat sink body 100 is manufactured by casting in a pre-designed form, and the heat dissipation fins 200 are manufactured by cutting a pre-made aluminum or aluminum alloy panel to a pre-designed size.

[0049] The heat dissipation fins 200 are positioned to be placed upright on the heat dissipation surface 102 of the heat sink body 100, and are fixed to the heat dissipation surface 102 of the heat sink body 100 by laser welding while in this position.

[0050] 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 where the lower end of the heat dissipation fin portion 200 contacts 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 welding.

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

[0052] On the other hand, 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.

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

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

[0055] When each of the plurality of 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. In this case, the lower end of each of the multiple heat dissipation fin sections 200 is inserted between the first heat dissipation fin support section 110 and the second heat dissipation fin support section 120 and erected on the support block section 130, so that the first heat dissipation fin support section 110 can support one side of each of the multiple heat dissipation fin sections 200, and the second heat dissipation fin support section 120 can support the other side of each of the multiple heat dissipation fin sections 200. Then, one of the spaces between one side of each of the multiple heat dissipation fin sections 200 and one side of the first heat dissipation fin support section 110, or between the other side of each of the multiple heat dissipation fin sections 200 and one side of the second heat dissipation fin support section 120, can be fixed by laser welding.

[0056] If each of the plurality of welded joints 107 is formed only at the first heat dissipation fin support portion 110, the first heat dissipation fin support portion 110 may be formed to protrude above the heat dissipation surface 102. In this case, the lower end of each of the plurality of heat dissipation fin portions 200 is erected on the heat dissipation surface 102 on one side of the first heat dissipation fin support portion 110, so that the first heat dissipation fin support portion 110 can support one side of each of the plurality of heat dissipation fin portions 200. The space between one side of each of the plurality of heat dissipation fin portions 200 and one side of the first heat dissipation fin support portion 110 can then be fixed by laser welding.

[0057] If each of the plurality of welded joints 107 is formed only at 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 protruding from each other on the heat dissipation surface 102. That is, the first heat dissipation fin support portion 110 may be formed protruding from the heat dissipation surface 102, and the second heat dissipation fin support portion 120 may be formed protruding from the heat dissipation surface 102 at a distance from the first heat dissipation fin support portion 110. In this case, the lower end of each of the plurality of heat dissipation fin portions 200 is 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, so that the first heat dissipation fin support portion 110 can support one side of each of the plurality of heat dissipation fin portions 200, and the second heat dissipation fin support portion 120 can support the other side of each of the plurality of heat dissipation fin portions 200. Then, one of the following can be fixed by laser welding: between one side of each of the multiple heat dissipation fin sections 200 and one side of the first heat dissipation fin support section 110, and between the other side of each of the multiple heat dissipation fin sections 200 and one side of the second heat dissipation fin support section 120.

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

[0059] If each of the plurality of welded joints 107 includes a support block portion 130, the support block portion 130 may be formed to protrude from the heat dissipation surface 102 of the heat sink body portion 100.

[0060] If each of the plurality of welded joints 107 does not include a support block portion 130, the first heat dissipation fin support portion 110 may be formed to protrude from the heat dissipation surface 102 of the heat sink body portion 100, or 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 of the heat sink body portion 100.

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

[0062] The distance between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 is the same as the thickness t1 of the heat dissipation fin portion 200, or there is a small, large gap between them, and the heat dissipation fin portion 200 is sandwiched and inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0063] One example is that 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, and the heat dissipation fin portion 200 is sandwiched and inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120.

[0064] For example, 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 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, for example, 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 formed to be 0.7 to 1.1 times the thickness t1 of the heat dissipation fin portion 200.

[0065] The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 support both sides of the heat dissipation fin portion 200, 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.

[0066] Either the first heat dissipation fin support portion 110 or the second heat dissipation fin support portion 120 melts during laser welding to act 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 1.1 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200, it is difficult for them to act as filler material during laser welding. 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 greater than the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0067] 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 plurality of heat dissipation fin portions 200.

[0068] 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 the heat dissipation fin portion 200 may be insufficient. 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.

[0069] The thickness t4 of the support block portion 130 is formed to be 2.4 to 3.3 times the thickness t1 of the heat dissipation fin portion 200. This thickness allows for the stable formation of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 at the end, and does not affect the spacing of the heat dissipation fin portion 200.

[0070] In other words, if the thickness t4 of the support block portion 130 is 3.3 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200, the number of heat dissipation fin portions 200 provided on the heat sink body portion 100 will be small, resulting in reduced heat dissipation performance. Conversely, if the thickness t4 of the support block portion 130 is less than 2.4 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200, there is a problem in that the thickness of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 cannot be formed sufficiently. Therefore, it is preferable that the thickness t4 of the support block portion 130 be formed to be 2.4 to 3.3 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0071] 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.

[0072] 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 is fixed between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 by laser welding.

[0073] 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, and then laser welding is performed on either side of 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.

[0074] 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 its rigidity in both lateral directions and allowing it to be firmly fixed on the heat dissipation surface 102 of the heat sink body section 100.

[0075] Figure 6 is a magnified view of a portion of another embodiment of the heat sink structure according to the present invention.

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

[0077] For example, the thickness of the first heat dissipation fin support portion 110 may be the same as or less than the thickness of the heat dissipation fin portion 200. More specifically, for example, the thickness of the first heat dissipation fin support portion 110 may be 0.7 to 1.1 times the thickness of the heat dissipation fin portion 200.

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

[0079] Furthermore, the first heat dissipation fin support portion 110 supports one side 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, and can also melt during laser welding to act as a filler material.

[0080] The first heat dissipation fin support portion 110 melts during laser welding and acts as filler material. In this case, if the thickness of the first heat dissipation fin support portion 110 is 1.1 times greater than the thickness of each of the multiple heat dissipation fin portions 200, it is difficult for it to act as filler material during laser welding. If the thickness of the first heat dissipation fin support portion 110 is less than 0.7 times greater than the thickness 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 is formed to be 0.7 to 1.1 times greater than the thickness t1 of each of the multiple heat dissipation fin portions 200.

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

[0082] If the height of the first heat dissipation fin support portion 110 is less than the thickness of each of the multiple heat dissipation fin portions 200, the rigidity supporting both sides of the heat dissipation fin portion 200 may be insufficient. If the height of the first heat dissipation fin support portion 110 is more than twice the thickness of each of the multiple heat dissipation fin portions 200, this may reduce the heat dissipation effect. Therefore, it is preferable that the height h of the first heat dissipation fin support portion 110 be formed to be 1 to 2 times the thickness t1 of each of the multiple heat dissipation fin portions 200.

[0083] Figures 7 to 10 illustrate other shapes of the heat dissipation fin portion 200 in the heat sink structure according to the present invention.

[0084] More specifically, Figure 7(a) is an example of a heat dissipation fin section 200 manufactured in the shape of the letter "U," and Figure 7(b) is a perspective view showing a heat sink structure in which the letter "U" shaped heat dissipation fin section 200 shown in Figure 7(a) is fixed to the heat sink body section 100 by laser welding.

[0085] Furthermore, Figure 8(a) is an example of a heat dissipation fin section 200 manufactured in the shape of the letter "V", and Figure 8(b) is a perspective view showing a heat sink structure in which the letter "V" shaped heat dissipation fin section 200 shown in Figure 8(a) is fixed to the heat sink body section 100 by laser welding.

[0086] Furthermore, Figure 9(a) is an example of a heat dissipation fin section 200 manufactured in a composite form of the letter "V" and the letter "U", and Figure 9(b) is a perspective view showing a heat sink structure in which the heat dissipation fin section 200 in the composite form of the letter "V" and the letter "U" shown in Figure 9(a) is fixed to the heat sink body section 100 by laser welding.

[0087] Furthermore, Figure 10(a) is an example of a heat dissipation fin section 200 manufactured in the shape of the letter "L", and Figure 10(b) is a perspective view showing a heat sink structure in which the letter "L" shaped heat dissipation fin section 200 shown in Figure 10(a) is fixed to the heat sink body section 100 by laser welding.

[0088] Referring to Figures 7 to 9, the heat dissipation fin section 200 can include a plate support member 210 and heat dissipation fin members 220 positioned upright on both ends of the plate support member 210.

[0089] Furthermore, referring to Figure 10, the heat dissipation fin section 200 may include a plate support member 210 and a heat dissipation fin member 220 that is positioned upright on either one of the ends of the plate support member 210.

[0090] In other words, the heat dissipation fin member 220 may be positioned upright on at least one of the ends of the plate support member 210.

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

[0092] More specifically, the heat dissipation fin member 220 may include vertical fins 221 positioned perpendicular to the plate support member 210 at both ends of the plate support member 210, as shown in Figure 7, or it may include inclined fins 222 formed at both ends of the plate support member 210, with the distance between them increasing as they move away from the plate support member 210, as shown in Figure 8.

[0093] Furthermore, as shown in Figure 9, the heat dissipation fin member 220 may include inclined fins 222 formed at both ends of the plate support member 210, which are inclined such that the distance between them increases as they move away from the plate support member 210, and vertical fins 221 extending perpendicularly to the plate support member 210 from each end of the inclined fins 222.

[0094] Furthermore, the heat dissipation fin member 220 may include a vertical fin 221 positioned perpendicular to the plate support member 210 at either end of the plate support member 210, as shown in Figure 10.

[0095] That is, as shown in Figures 7 and 10, the heat dissipation fin member 220 may include a vertical fin 221 positioned perpendicular to the plate support member 210 at at least one of the ends of the plate support member 210.

[0096] The heat dissipation fin member 220 may also be manufactured in a variety of shapes known by heat dissipation design structures for dissipating heat from the product to be heated.

[0097] On the other hand, one embodiment of the method for manufacturing a heat sink according to the present invention includes a preparation step of separately manufacturing a heat sink body 100 and a plurality of heat dissipation fins 200 that perform heat dissipation, and a laser welding step after the preparation step of fixing the plurality of heat dissipation fins 200 to the heat dissipation surface 102 of the heat sink body 100 by laser welding, with the fins spaced apart from each other.

[0098] The preparation step involves manufacturing the heat sink body 100 by casting, and manufacturing the multiple heat dissipation fins 200 by cutting a pre-fabricated metal plate, such as an aluminum plate or an aluminum alloy plate.

[0099] One example of the laser welding step is to position the heat dissipation fin portion 200 upright with its lower end resting on the heat dissipation surface 102, and then irradiate a laser at an angle between one side of the heat dissipation fin portion 200 and the heat dissipation surface 102 to fix the heat dissipation fin portion 200 to the heat dissipation surface 102 by laser welding.

[0100] In addition, in the preparation step, a plurality of welded joint portions 107 are formed to protrude from the heat dissipation surface 102 of the heat sink body portion 100, and in the laser welding step, a plurality of heat dissipation fin portions 200 are joined to the plurality of welded joint portions 107 by laser welding.

[0101] To be more specific, 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 lower end of each of the plurality of heat sink fin portions is erected on the heat sink surface on one side of the first heat sink fin support portion, the first heat sink fin support portion supports one side of each of the plurality of heat sink fin portions, and the space between one side of each of the plurality of heat sink fin portions and one side of the first heat sink fin support portion can be fixed by laser welding.

[0102] 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 lower end of each of the plurality of heat fin portions is inserted between the first heat fin support portion and the second heat fin support portion and erected on the heat dissipation surface, the first heat fin support portion supports one side of each of the plurality of heat fin portions, and the second heat fin support portion supports the other side of each of the plurality of heat fin portions, and one of the following can be fixed by laser welding: between one side of each of the plurality of heat fin portions and one side of the first heat fin support portion, and between the other side of each of the plurality of heat fin portions and one side of the second heat fin support portion.

[0103] Alternatively, in the preparation step, the heat sink body 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 100. In this case, in the laser welding step, the lower end of each of the plurality of heat dissipation fin portions can be erected on the support block portion and fixed to the support block portion by laser welding.

[0104] 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 second heat dissipation fin support portions 120 may be formed protruding from both ends of the support block portion 130, separated from the first heat dissipation fin support portion 110. In this case, during the laser welding step, the lower end of each of the plurality of heat dissipation fins is inserted between the first heat dissipation fin support and the second heat dissipation fin support and erected on the support block, the first heat dissipation fin support supports one side of each of the plurality of heat dissipation fins, and the second heat dissipation fin support supports the other side of each of the plurality of heat dissipation fins. One of the following can be fixed by laser welding: the space between one side of each of the plurality of heat dissipation fins and one side of the first heat dissipation fin support, and the space between the other side of each of the plurality of heat dissipation fins and one side of the second heat dissipation fin support.

[0105] For example, the preparation step involves manufacturing the heat sink body 100 by casting, and manufacturing it so that a first heat fin support portion 110 and a second heat fin support portion 120 protrude from the heat dissipation surface, between which the heat dissipation fin portion 200 can be inserted. The laser welding step includes, for example, a heat fin assembly step in which the heat dissipation fin portion 200 is inserted between the first heat fin support portion 110 and the second heat fin support portion 120, and a heat fin welding step in which, after the heat fin assembly step, a laser is irradiated onto either the first heat fin support portion 110 or the second heat fin support portion 120 to laser weld the heat fin portion 200.

[0106] More specifically, the heat dissipation fin welding step involves irradiating the first heat dissipation fin support 110 and the heat dissipation fin portion 200, or the second heat dissipation fin support 120 and the heat dissipation fin portion 200, at an angle, or simultaneously irradiating the first heat dissipation fin support 110 and the heat dissipation fin portion 200 and the second heat dissipation fin support 120 and the heat dissipation fin portion 200 with a laser to fix the heat dissipation fin portion 200 by laser welding.

[0107] Figure 11 is a photograph of a first test example in which the heat dissipation fin portion 200 of the heat sink manufacturing method according to the present invention was laser-welded. In the first test example, a straight heat dissipation fin portion 200 with a thickness of 1T (mm) was erected on the heat dissipation surface 102 of the heat sink body portion 100 with a thickness of 2T (mm), and fillet welding was carried out.

[0108] 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 (power output) set.

[0109] [Table 1]

[0110] Figure 11(a) is a magnified photograph of the welded area, and Figure 11(b) is a photograph of the bottom surface of the heat sink body 100 after welding.

[0111] Referring to Figure 11(a), it can be seen that when the lower end of a straight heat dissipation fin portion 200 with a thickness of 1T (mm) 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.

[0112] 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.

[0113] Furthermore, referring to Figure 11(b), when the lower end of the straight-shaped heat dissipation fin portion 200, which has a thickness of 1T (mm), 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, it can be confirmed that even when the minimum heat input (output) is set and the laser welding is carried out, warping deformation occurs within 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.

[0114] Figure 12 is a photograph of a second test example in which the heat dissipation fin portion 200 of the heat sink manufacturing method according to the present invention was laser-welded. In the second test example, a support block portion 130 protrudes from the heat dissipation surface of a heat sink body portion 100 with a thickness of 2T (mm), and a first heat dissipation fin support portion 110 and a second heat dissipation fin support portion 120, each with a thickness of 1T (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 1T (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.

[0115] 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.

[0116] [Table 2]

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

[0118] Referring to Figure 12(a), it can be confirmed that the first heat dissipation fin support 110 supports the side of the heat dissipation fin 200 that is not laser-welded, thereby reinforcing the rigidity on the opposite side of the laser-welded area, and the second heat dissipation fin support 120, during laser welding, melts a portion of its upper side and acts as a filler material, while simultaneously further increasing the rigidity of the laser-welded area. Also, referring to Figure 12(b), it can be confirmed that no warping deformation occurs on the mounting surface 101, which is the bottom surface of the heat sink body 100.

[0119] As described above, the present invention involves 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, improving heat dissipation performance and significantly reducing weight. Furthermore, the present invention significantly reduces production time and manufacturing costs by manufacturing only the heat sink body 100 by casting.

[0120] A person 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 limiting in all respects. The scope of the present invention is defined by the claims, which are set forth below, and all modifications or alterations 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]

[0121] The present invention provides a heat sink structure and a method for manufacturing the same, which minimizes the thickness and spacing of the heat dissipation fins by 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, thereby significantly reducing manufacturing costs. [Explanation of symbols]

[0122] 1: Heat sink structure, 100: Heat sink main body 101: Mounting surface, 102: Heat dissipation surface 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: Plate support member 220: Heat dissipation fin component, 221: Vertical fin 222: Inclined fins

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, The heat sink body includes a plurality of heat dissipation fins that are erected on the heat dissipation surface and fixed by laser welding, Multiple welded joints are formed on the heat dissipation surface of the heat sink body, with each of the multiple heat dissipation fins being joined by laser welding. Each of the plurality of welded joints is formed only at the first heat dissipation fin support portion that protrudes from the heat dissipation surface, The lower end of each of the plurality of heat dissipation fin portions is erected on the heat dissipation surface on one side of the first heat dissipation fin support portion, and the first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions. A heat sink structure in which one side of each of the plurality of heat dissipation fin sections and one side of the first heat dissipation fin support section are fixed together by laser welding.

2. 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, The heat sink body includes a plurality of heat dissipation fins that are erected on the heat dissipation surface and fixed by laser welding, Multiple welded joints are formed on the heat dissipation surface of the heat sink body, with each of the multiple heat dissipation fins being joined by laser welding. 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, The lower end of each of the plurality of heat dissipation fin portions is inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and erected on the support block portion, the first heat dissipation fin support portion supports one side of each of the plurality of heat dissipation fin portions, and the second heat dissipation fin support portion supports the other side of each of the plurality of heat dissipation fin portions. A heat sink structure in which one of the following is fixed by laser welding: the space between one side of each of the plurality of heat dissipation fins and one side of the first heat dissipation fin support; and the space between the other side of each of the plurality of heat dissipation fins and one side of the second heat dissipation fin support.

3. The heat sink structure according to claim 1, wherein 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.

4. The heat sink structure according to claim 3, 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 heat sink structure according to claim 2, wherein 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.

6. The heat sink structure according to claim 5, 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.

7. The heat sink structure according to claim 2, wherein the thickness of the support block portion is formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

8. 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 2, wherein the thickness of the support block portion is formed to be 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions.

9. The heat sink structure according to claim 8, 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.

10. Each of the aforementioned plurality of heat dissipation fin sections is Plate support member, The heat sink structure according to claim 1, further comprising a heat dissipation fin member positioned upright on at least one of both ends of the plate support member.

11. The heat dissipation fin member is The heat sink structure according to claim 10, wherein at least one of the ends of the plate support member includes a vertical fin that is positioned perpendicular to the plate support member.

12. The heat dissipation fin member is The heat sink structure according to claim 10, further comprising inclined fins formed at both ends of the plate support member, wherein the distance between them increases as they move away from the plate support member.

13. The heat dissipation fin member is The heat sink structure according to claim 12, further comprising vertical fins extending perpendicularly from each end of the inclined fins to the plate support member.

14. A preparation step of separately manufacturing a heat sink body, which has 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, and a plurality of heat dissipation fins that perform the heat dissipation function, The process includes a laser welding step of fixing the plurality of heat dissipation fins to the heat dissipation surface of the heat sink body portion by laser welding, with the fins spaced apart from each other. In the aforementioned preparation step, The heat sink body is manufactured by casting. A method for manufacturing a heat sink structure, wherein the plurality of heat dissipation fins are manufactured by cutting a pre-fabricated metal plate.

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