HEAT SINK STRUCTURE AND MANUFACTURING METHOD THEREOF

The present invention relates to a heat sink structure and a manufacturing method thereof, in which a plurality of heat radiation fin parts, which is configured to radiate heat, is fixed to a heat radiation surface of a heat sink main body part by laser welding, such that thicknesses of and intervals between the plurality of heat radiation fin parts may be minimized, heat dissipation performance may be improved, a weight may be greatly reduced, and production lead time and manufacturing costs may be significantly reduced by manufacturing only the heat sink main body part by casting.

TECHNICAL FIELD

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 main body by laser welding, and a manufacturing method thereof.

BACKGROUND ART

In general, a heat sink may be installed in a product that is required to dissipate heat, and the heat sink may effectively dissipate heat.

The heat sinks are applied to various products in electronic, machinery, and automotive industries, such as LED lighting, semiconductor manufacturing equipment, computers, medical devices, and radiation application machines to prevent damage caused by heat and enable stable operations. The heat sinks are modified and applied in various shapes that suit the products.

Typically, the heat sink has a structure in which a heat sink main body has a mounting surface on which a product, which is required to dissipate heat, is mounted, and a plurality of heat radiation fins stands on an opposing surface to the mounting surface, such that the heat sink quickly dissipates heat, which is generated from the product, by means of heat exchange between air and the heat radiation fins.

The heat sink in the related art is manufactured by extrusion or casting and has a structure in which a heat radiation plate, which is the heat sink main body, and the plurality of heat radiation fins are integrated.

However, the heat sink in the related art is manufactured by extrusion or casting, and the heat radiation plate and the plurality of heat radiation fins are integrated, which makes it difficult to reduce thicknesses of and intervals between the plurality of heat radiation fins. For this reason, the number of heat radiation fins is small, which causes a problem in that heat dissipation performance is restricted, and it is difficult to reduce the weight.

In addition, because the heat sink in the related art is manufactured by extrusion or casting, a complicated mold needs to be designed to form the plurality of heat radiation fins. For this reason, a large amount of manufacturing costs is required, and the mold needs to be separately manufactured in a shape that suits the product, which causes a problem in that a large amount of time is required to design and manufacture the mold, and a defect rate is high during a manufacturing process.

DISCLOSURE

Technical Problem

The technical object of the present invention is to provide a heat sink structure, in which a heat sink main body part and a plurality of heat radiation fin parts are manufactured separately, and the plurality of heat radiation fin parts is fixed to the heat sink main body part by laser welding, such that thicknesses of and intervals between the plurality of heat radiation fin parts may be minimized, and manufacturing costs may be significantly reduced, and a manufacturing method thereof.

The technical problems of the present invention are not limited to the aforementioned technical problem, and other technical problems, which are not mentioned above, may be clearly understood by those skilled in the art from the following descriptions.

Technical Solution

In order to achieve the above-mentioned object, a heat sink structure according to the present invention includes a heat sink main body part and a plurality of heat radiation fin parts. A mounting surface is provided on one surface of the heat sink main body part, and a product from which heat is to be dissipated is positioned on the mounting surface. A heat radiation surface for dissipating heat is provided on a surface different from one surface of the heat sink main body part. The plurality of heat radiation fin parts is fixed by laser welding while standing on the heat radiation surface of the heat sink main body part.

A plurality of welding coupling parts may protrude from the heat radiation surface of the heat sink main body part. The plurality of heat radiation fin parts may be respectively coupled to the plurality of welding coupling parts by laser welding.

The plurality of welding coupling parts may each include a first heat radiation fin support portion. The first heat radiation fin support portion may protrude from the heat radiation surface. A lower end of each of the plurality of heat radiation fin parts may be disposed at one side of the first heat radiation fin support portion and stand on the heat radiation surface. The first heat radiation fin support portion may support one side of each of the plurality of heat radiation fin parts. A portion between one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion may be fixed by laser welding.

The plurality of welding coupling parts may each include a first heat radiation fin support portion and a second heat radiation fin support portion. The first heat radiation fin support portion may protrude from the heat radiation surface. The second heat radiation fin support portion may protrude from the heat radiation surface and be spaced apart from the first heat radiation fin support portion. A lower end of each of the plurality of heat radiation fin parts may be inserted between the first heat radiation fin support portion and the second heat radiation fin support portion and stand on the heat radiation surface. The first heat radiation fin support portion may support one side of each of the plurality of heat radiation fin parts. The second heat radiation fin support portion may support the other side of each of the plurality of heat radiation fin parts. One of a portion between one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion and a portion between the other side of each of the plurality of heat radiation fin parts and one side of the second heat radiation fin support portion may be fixed by laser welding.

The plurality of welding coupling parts may each include a support block portion. The support block portion may protrude from the heat radiation surface. A lower end of each of the plurality of heat radiation fin parts may stand on the support block portion and be fixed to the support block portion by laser welding.

The plurality of welding coupling parts may each include a support block portion, a first heat radiation fin support portion, and a second heat radiation fin support portion. The support block portion may protrude from the heat radiation surface. The first heat radiation fin support portion may protrude from one end of the support block portion. The second heat radiation fin support portion may protrude from the other end of the support block portion and be spaced apart from the first heat radiation fin support portion. A lower end of each of the plurality of heat radiation fin parts may be inserted between the first heat radiation fin support portion and the second heat radiation fin support portion and stand on the support block portion. The first heat radiation fin support portion may support one side of each of the plurality of heat radiation fin parts. The second heat radiation fin support portion may support the other side of each of the plurality of heat radiation fin parts. One of a portion between one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion and a portion between the other side of each of the plurality of heat radiation fin parts and one side of the second heat radiation fin support portion may be fixed by laser welding.

A thickness of the first heat radiation fin support portion may be 0.7 to 1.1 times a thickness of each of the plurality of heat radiation fin parts.

A height of the first heat radiation fin support portion may be 1 to 2 times the thickness of each of the plurality of heat radiation fin parts.

A thickness of the second heat radiation fin support portion may be 0.7 to 1.1 times the thickness of each of the plurality of heat radiation fin parts.

A height of the second heat radiation fin support portion may be 1 to 2 times the thickness of each of the plurality of heat radiation fin parts.

A thickness of the support block portion may be 2.4 to 3.3 times the thickness of each of the plurality of heat radiation fin parts.

The plurality of heat radiation fin parts may each include a plate support member and a heat radiation fin member. The heat radiation fin member may be disposed on at least one of two opposite ends of the plate support member while standing.

The heat radiation fin member may include a perpendicular fin. The perpendicular fin may be disposed on at least one of the two opposite ends of the plate support member and disposed perpendicularly to the plate support member.

The heat radiation fin members may include inclined fins formed at the two opposite ends of the plate support member. The inclined fins formed at the two opposite ends of the plate support member may be inclined such that a distance between the inclined fins increases as the distance from the plate support member increases.

The heat radiation fin members may further include perpendicular fins extending perpendicularly to the plate support member from ends of the inclined fins formed at the two opposite ends of the plate support member.

In order to achieve the above-mentioned object, a heat sink structure manufacturing method according to the present invention includes a preparation step and a laser welding step. In the preparation step, the heat sink main body part and the plurality of heat radiation fin parts are manufactured separately. A mounting surface is provided on one surface of the heat sink main body part, and a product from which heat is to be dissipated is positioned on the mounting surface. A heat radiation surface for dissipating heat is provided on a surface different from one surface of the heat sink main body part. The plurality of heat radiation fin parts dissipate heat. In the laser welding step, the plurality of heat radiation fin parts is fixed to the heat radiation surface of the heat sink main body part by laser welding and spaced apart from one another.

In the preparation step, the heat sink main body part may be manufactured by casting, and the plurality of heat radiation fin parts may be manufactured by cutting a premanufactured metal plate.

In the preparation step, a plurality of welding coupling parts may protrude from the heat radiation surface of the heat sink main body part. In the laser welding step, the plurality of heat radiation fin parts may be respectively coupled to the plurality of welding coupling parts by laser welding.

Other detailed matters of the embodiment are included in the detailed description and the drawings.

Advantageous Effects

According to the present invention, the heat sink main body part and the plurality of heat radiation fin parts are manufactured separately, and then the plurality of heat radiation fin parts is fixed to the heat sink main body part by laser welding, such that the thicknesses of and the intervals between the plurality of heat radiation fin parts may be minimized, the heat dissipation performance may be improved, and the weight may be significantly reduced.

In addition, according to the present invention, only the heat sink main body part is manufactured by casting, which may significantly reduce the production lead time and the manufacturing costs.

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

BEST MODE

The present invention may be variously modified and may have various embodiments, and particular embodiments illustrated in the drawings will be described in detail below.

However, the description of the embodiments is not intended to limit the present invention to the particular embodiments, but it should be understood that the present invention is to cover all modifications, equivalents and alternatives falling within the spirit and technical scope of the present invention. In the description of the drawings, similar reference numerals are used for similar constituent elements.

When one constituent element is described as being “coupled” or “connected” to another constituent element, it should be understood that one constituent element can be coupled or connected directly to another constituent element, and an intervening constituent element can also be present between the constituent elements. When one constituent element is described as being “coupled directly to” or “connected directly to” another constituent element, it should be understood that no intervening constituent element is present between the constituent elements.

The terminology used herein is used for the purpose of describing particular embodiments only and is not intended to limit the present invention. Singular expressions include plural expressions unless clearly described as different meanings in the context. The terms “comprises,” “comprising,” “includes,” “including,” “containing,” “has,” “having” or other variations thereof are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or combinations thereof.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Hereinafter, in the drawings, the same constituent elements will be designated by the same reference numerals, and the repetitive description of the same constituent elements will be omitted.

FIG.1is a bottom perspective view illustrating an embodiment of a heat sink structure according to the present invention,FIG.2is a top perspective view illustrating the embodiment of the heat sink structure according to the present invention,FIG.3is a side view illustrating the embodiment of the heat sink structure according to the present invention, andFIGS.4and5are enlarged views of a part of the embodiment of the heat sink structure according to the present invention.

In more detail,FIG.4is a view illustrating an example in which heat radiation fin parts200are coupled to a heat sink main body part100before laser welding, and FIG. is a view illustrating an example in which the heat radiation fin parts200are fixed to the heat sink main body part100after laser welding.

An embodiment of a heat sink structure1according to the present invention will be described below in detail with reference toFIGS.1to5.

The embodiment of the heat sink structure1according to the present invention includes the heat sink main body part100having one surface, i.e., a mounting surface101on which a product from which heat is to be dissipated is positioned.

In the present embodiment, an accommodation space105may be formed in the mounting surface101of the heat sink main body part100and accommodate the product. However, the heat sink main body part100may be formed in a plate shape in which the accommodation space105is not formed.

A heat radiation surface102, to which a plurality of heat radiation fin parts200configured to dissipate heat by means of heat exchange is fixed, is positioned on the other surface of the heat sink main body part100.

For example, the heat radiation surface102of the heat sink main body part100is an opposing surface to the mounting surface101. Alternatively, the heat radiation surface102may change to a surface different from the mounting surface101in accordance with the design of the product.

For example, the heat radiation fin part200has a straight panel shape. Alternatively, the heat radiation fin part200may be manufactured in various shapes such as a curved panel shape or a rod shape.

For example, the heat sink main body part100and the heat radiation fin part200are made of aluminum or aluminum alloy. Alternatively, the heat sink main body part100and the heat radiation fin part200may be variously manufactured by using publicly-known material with excellent thermal conduction that is used to manufacture a heat sink.

Further, for example, the heat sink main body part100is manufactured in a predesigned shape by casting, and the heat radiation fin part200is manufactured by cutting a premanufactured aluminum or aluminum alloy panel into a predesigned size.

The heat radiation fin part200is seated and positioned on the heat radiation surface102of the heat sink main body part100while standing. The heat radiation fin part200is fixed onto the heat radiation surface102of the heat sink main body part100by laser welding in the state in which the heat radiation fin part200is seated on the heat radiation surface102of the heat sink main body part100.

In a state in which an end of the heat radiation fin part200is seated on the heat radiation surface102of the heat sink main body part100, the laser welding is performed by irradiating a boundary line between the heat sink main body part100and the heat radiation fin part200, i.e., an edge of a lower end of the heat radiation fin part200, which meets the heat radiation surface102, with laser beams, such that the heat radiation fin part200is fixed onto the heat radiation surface102of the heat sink main body part100by welding.

The heat sink structure1according to the present invention is manufactured by manufacturing the heat sink main body part100by casting, manufacturing the heat radiation fin part200separately from the heat sink main body part100, and fixing the heat radiation fin part200to the heat sink main body part100by laser welding.

Meanwhile, a plurality of welding coupling parts107may protrude from the heat radiation surface102of the heat sink main body part100, and the plurality of heat radiation fin parts200may be respectively coupled to the plurality of welding coupling parts107by laser welding.

The plurality of welding coupling parts107may each include a first heat radiation fin support portion110, a second heat radiation fin support portion120, and a support block portion130.

However, the plurality of welding coupling parts107may each include only the first heat radiation fin support portion110, include only the first heat radiation fin support portion110and the second heat radiation fin support portion120, or include only the support block portion130.

In case that the plurality of welding coupling parts107each includes the first heat radiation fin support portion110, the second heat radiation fin support portion120, and the support block portion130, the support block portion130may protrude from the heat radiation surface102, and the first heat radiation fin support portion110and the second heat radiation fin support portion120may protrude from two opposite ends of the support block portion130and be spaced apart from each other. That is, the first heat radiation fin support portion110may protrude from one end of the support block portion130, and the second heat radiation fin support portion120may protrude from the other end of the support block portion130and be spaced apart from the first heat radiation fin support portion110. In this case, the lower end of each of the plurality of heat radiation fin parts200is inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120and stands on the support block portion130, such that the first heat radiation fin support portion110may support one side of each of the plurality of heat radiation fin parts200, and the second heat radiation fin support portion120may support the other side of each of the plurality of heat radiation fin parts200. Further, one of a portion between one side of each of the plurality of heat radiation fin parts200and one side of the first heat radiation fin support portion110and a portion between the other side of each of the plurality of heat radiation fin parts200and one side of the second heat radiation fin support portion120may be fixed by laser welding.

In case that the plurality of welding coupling parts107each includes only the first heat radiation fin support portion110, the first heat radiation fin support portion110may protrude from the heat radiation surface102. In this case, the lower end of each of the plurality of heat radiation fin parts200is disposed at one side of the first heat radiation fin support portion110and stands on the heat radiation surface102, such that the first heat radiation fin support portion110may support one side of each of the plurality of heat radiation fin parts200. Further, a portion between one side of each of the plurality of heat radiation fin parts200and one side of the first heat radiation fin support portion110may be fixed by laser welding.

In case that the plurality of welding coupling parts107each includes only the first heat radiation fin support portion110and the second heat radiation fin support portion120, the first heat radiation fin support portion110and the second heat radiation fin support portion120may protrude from the heat radiation surface102and be spaced apart from each other. That is, the first heat radiation fin support portion110may protrude from the heat radiation surface102, and the second heat radiation fin support portion120may protrude from the heat radiation surface102and be spaced apart from the first heat radiation fin support portion110. In this case, the lower end of each of the plurality of heat radiation fin parts200is inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120and stands on the heat radiation surface102, such that the first heat radiation fin support portion110may support one side of each of the plurality of heat radiation fin parts200, and the second heat radiation fin support portion120may support the other side of each of the plurality of heat radiation fin parts200. Further, one of a portion between one side of each of the plurality of heat radiation fin parts200and one side of the first heat radiation fin support portion110and a portion between the other side of each of the plurality of heat radiation fin parts200and one side of the second heat radiation fin support portion120may be fixed by laser welding.

In case that the plurality of welding coupling parts107each includes only the support block portion130, the support block portion130may protrude from the heat radiation surface102. In this case, the lower end of each of the plurality of heat radiation fin parts200may stand on the support block portion130. Further, the lower end of each of the plurality of heat radiation fin parts200may be fixed to the support block portion130by laser welding.

In case that the plurality of welding coupling parts107each includes the support block portion130, the support block portion130may protrude from the heat radiation surface102of the heat sink main body part100.

In case that each of the plurality of welding coupling parts107does not include the support block portion130, the first heat radiation fin support portion110may protrude from the heat radiation surface102of the heat sink main body part100, or the first heat radiation fin support portion110and the second heat radiation fin support portion120may protrude from the heat radiation surface102of the heat sink main body part100.

In case that the plurality of welding coupling parts107each includes the first heat radiation fin support portion110and the second heat radiation fin support portion120, one end of each of the plurality of heat radiation fin parts200may be inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120.

The first heat radiation fin support portion110and the second heat radiation fin support portion120are spaced apart from each other at an interval equal to or finely larger than a thickness t1of the heat radiation fin part200, such that the heat radiation fin part200is fitted and inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120.

For example, the first heat radiation fin support portion110and the second heat radiation fin support portion120are spaced apart from each other at an interval of 1 to 1.2 times the thickness t1of the heat radiation fin part200, such that the heat radiation fin part200is fitted and inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120.

Further, for example, a thickness t2of the first heat radiation fin support portion110and a thickness t3of the second heat radiation fin support portion120are equal to or finely larger or smaller than the thickness t1of each of the plurality of heat radiation fin parts200. In more detail, for example, the thickness t2of the first heat radiation fin support portion110and the thickness t3of the second heat radiation fin support portion120are each 0.7 to 1.1 times the thickness t1of the heat radiation fin part200.

The first heat radiation fin support portion110and the second heat radiation fin support portion120may serve to increase a fixing force for the heat radiation fin part200by supporting the two opposite sides of the heat radiation fin part200fixed by laser welding and also serves as a filler material by being melted during laser welding.

One of the first heat radiation fin support portion110and the second heat radiation fin support portion120serve as a filler material by being melted during laser welding. In this case, in case that the thickness t2of the first heat radiation fin support portion110and the thickness t3of the second heat radiation fin support portion120are each as large as more than 1.1 times the thickness t1of each of the plurality of heat radiation fin parts200, there is a problem in that it is difficult for one of the first heat radiation fin support portion110and the second heat radiation fin support portion120to serve as a filler material during laser welding. In case that the thickness t2of the first heat radiation fin support portion110and the thickness t3of the second heat radiation fin support portion120are each as small as less than 0.7 times the thickness t1of each of the plurality of heat radiation fin parts200, there is a problem in that the rigidity for supporting the heat radiation fin part200, i.e., the rigidity of the opposing side to the welded portion is insufficient. Therefore, the thickness t2of the first heat radiation fin support portion110and the thickness t3of the second heat radiation fin support portion120may be 0.7 to 1.1 times the thickness t1of each of the plurality of heat radiation fin parts200.

In addition, a height h of the first heat radiation fin support portion110and a height h of the second heat radiation fin support portion120may each be 1 to 2 times the thickness t1of each of the plurality of heat radiation fin parts200.

In case that the height h of the first heat radiation fin support portion110and the height h of the second heat radiation fin support portion120are each smaller than the thickness t1of each of the plurality of heat radiation fin parts200, the rigidity for supporting the two opposite surfaces of the heat radiation fin part200may be insufficient. In case that the height h of the first heat radiation fin support portion110and the height h of the second heat radiation fin support portion120are each as large as more than 2 times the thickness t1of each of the plurality of heat radiation fin parts200, the heat dissipation effect may deteriorate. Therefore, the height h of the first heat radiation fin support portion110and the height h of the second heat radiation fin support portion120may each be 1 to 2 times the thickness t1of each of the plurality of heat radiation fin parts200.

A thickness t4of the support block portion130is 2.4 to 3.3 times the thickness t1of the heat radiation fin part200. The thickness t4is a thickness that may be stably defined at an end of the first heat radiation fin support portion110and an end of the second heat radiation fin support portion120, i.e., a thickness that does not affect the intervals between the heat radiation fin parts200.

That is, in case that the thickness t4of the support block portion130is as large as more than 3.3 times the thickness t1of each of the plurality of heat radiation fin parts200, the number of heat radiation fin parts200installed on the heat sink main body part100is small, which degrades the heat dissipation performance. In case that the thickness t4of the support block portion130is as small as less than 2.4 times the thickness t1of each of the plurality of heat radiation fin parts200, there is a problem in that it is difficult for the first heat radiation fin support portion110and the second heat radiation fin support portion120to have sufficient thicknesses. Therefore, the thickness t4of the support block portion130may be 2.4 to 3.3 times the thickness t1of each of the plurality of heat radiation fin parts200.

The support block portion130allows the heat radiation fin parts200to be positioned on the heat radiation surface102of the heat sink main body part100and spaced apart from each other, such that the laser-welded portion is positioned at a predesigned height or more on the heat radiation surface102of the heat sink main body part100, which may prevent the mounting surface101of the heat sink main body part100from being bent by heat after laser welding.

During the laser welding, any one of the first heat radiation fin support portion110and the second heat radiation fin support portion120serves as a filler material to be melted together with the heat radiation fin part200. After the laser welding, the heat radiation fin part200is fixed between the first heat radiation fin support portion110and the second heat radiation fin support portion120by laser welding.

The heat radiation fin part200is inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120and then laser-welded at any one side of the first heat radiation fin support portion110and the second heat radiation fin support portion120, such that the heat radiation fin part200is securely fixed between the first heat radiation fin support portion110and the second heat radiation fin support portion120.

After laser welding, the heat radiation fin part200is supported by the first heat radiation fin support portion110and the second heat radiation fin support portion120, and the rigidity is improved in both the two directions, such that the heat radiation fin part200may be securely fixed onto the heat radiation surface102of the heat sink main body part100.

FIG.6is an enlarged view of a part of another embodiment of the heat sink structure according to the present invention.

With reference toFIG.6, the heat sink structure1according to the present invention may include the first heat radiation fin support portion110protruding from the heat radiation surface of the heat sink main body part100and configured to support one side of the heat radiation fin part200.

For example, a thickness of the first heat radiation fin support portion110is equal to or smaller than a thickness of the heat radiation fin part200. In more detail, for example, the thickness of the first heat radiation fin support portion110is 0.7 to 1.1 times the thickness of the heat radiation fin part200.

During laser welding, the laser beams are emitted in an inclined direction between the first heat radiation fin support portion110and the heat radiation fin part200.

Further, the first heat radiation fin support portion110may serve to increase a fixing force for the heat radiation fin part200by supporting one side of the heat radiation fin part200fixed by laser welding and also serves as a filler material by being melted during laser welding.

The first heat radiation fin support portion110serves as a filler material by being melted during laser welding. In this case, in case that the thickness of the first heat radiation fin support portion110is as large as more than 1.1 times the thickness of each of the plurality of heat radiation fin parts200, there is a problem in that it is difficult for the first heat radiation fin support portion110to serve as a filler material during laser welding. In case that the thickness of the first heat radiation fin support portion110is as small as less than 0.7 times the thickness of each of the plurality of heat radiation fin parts200, there is a problem in that the rigidity for supporting the heat radiation fin part200, i.e., the rigidity of the opposing side to the welded portion is insufficient. Therefore, the thickness t2of the first heat radiation fin support portion110may be 0.7 to 1.1 times the thickness t1of each of the plurality of heat radiation fin parts200.

In addition, the height of the first heat radiation fin support portion110may be 1 to 2 times the thickness of each of the plurality of heat radiation fin parts200.

In case that the height of the first heat radiation fin support portion110is smaller than the thickness of each of the plurality of heat radiation fin parts200, the rigidity for supporting the two opposite surfaces of the heat radiation fin part200may be insufficient. In case that the height of the first heat radiation fin support portion110is as large as more than 2 times the thickness of each of the plurality of heat radiation fin parts200, the heat dissipation effect may deteriorate. Therefore, the height h of the first heat radiation fin support portion110may be 1 to 2 times the thickness t1of each of the plurality of heat radiation fin parts200.

FIGS.7to10are views illustrating another shape of the heat radiation fin part200of the heat sink structure according to the present invention.

In more detail,FIG.7Ais a view illustrating the heat radiation fin part200manufactured in an alphabet U shape, andFIG.7Bis a perspective view illustrating a heat sink structure in which the heat radiation fin part200having the alphabet U shape illustrated inFIG.7Ais fixed to the heat sink main body part100by laser welding.

In addition,FIG.8Ais a view illustrating the heat radiation fin part200manufactured in an alphabet V shape, andFIG.8Bis a perspective view illustrating a heat sink structure in which the heat radiation fin part200having the alphabet V shape illustrated inFIG.8Ais fixed to the heat sink main body part100by laser welding.

In addition,FIG.9Ais a view illustrating the heat radiation fin part200manufactured in a shape made by combining an alphabet V shape and an alphabet U shape, andFIG.9Bis a perspective view illustrating a heat sink structure in which the heat radiation fin part200illustrated inFIG.9Aand having the shape made by combining the alphabet V shape and the alphabet U shape is fixed to the heat sink main body part100by laser welding.

In addition,FIG.10Ais a view illustrating the heat radiation fin part200manufactured in an alphabet L shape, andFIG.10Bis a perspective view illustrating a heat sink structure in which the heat radiation fin part200having the alphabet L shape illustrated inFIG.10Ais fixed to the heat sink main body part100by laser welding.

With reference toFIGS.7to9, the heat radiation fin part200may include a plate support member210, and heat radiation fin members220positioned at two opposite ends of the plate support member210while standing.

In addition, with reference toFIG.10, the heat radiation fin part200may include the plate support member210, and the heat radiation fin member220provided at any one of the two opposite ends of the plate support member210while standing.

That is, the heat radiation fin member220may be disposed on at least one of the two opposite ends of the plate support member210while standing.

In case that the plurality of welding coupling parts107each includes the support block portion130, the plate support member210may be seated on the support block portion130. Further, in case that each of the plurality of welding coupling parts107does not include the support block portion130, the plate support member210may be seated on the heat radiation surface102of the heat sink main body part100.

Specifically, as illustrated inFIG.7, the heat radiation fin members220may include perpendicular fins221disposed at the two opposite ends of the plate support member210and disposed perpendicularly to the plate support member210. Alternatively, as illustrated inFIG.8, the heat radiation fin members220may include inclined fins222formed at the two opposite ends of the plate support member210and inclined such that a distance between the inclined fins222increases as the distance from the plate support member210increases.

In addition, as illustrated inFIG.9, the heat radiation fin members220may include the inclined fins222formed at the two opposite ends of the plate support member210and inclined such that the distance between the inclined fins222increases as the distance from the plate support member210increases, and the perpendicular fins221respectively extending from ends of the inclined fins222perpendicularly to the plate support member210.

In addition, as illustrated inFIG.10, the heat radiation fin member220may include the perpendicular fin221disposed on any one of the two opposite ends of the plate support member210and disposed perpendicularly to the plate support member210.

That is, with reference toFIGS.7and10, the heat radiation fin member220may include the perpendicular fin221disposed on at least one of the two opposite ends of the plate support member210and disposed perpendicularly to the plate support member210.

The heat radiation fin member220may be manufactured in various publicly-known shapes in accordance with a structure of a heat dissipation design for dissipating heat from a product from which heat is to be dissipated.

Meanwhile, an embodiment of a heat sink manufacturing method according to the present invention includes a preparation step of separately manufacturing the heat sink main body part100and the plurality of heat radiation fin parts200configured to dissipate heat, and a laser welding step of fixing the plurality of heat radiation fin parts200to the heat radiation surface102of the heat sink main body part100by laser welding so that the plurality of heat radiation fin parts200is spaced apart from one another after the preparation step.

For example, in the preparation step, the heat sink main body part100is manufactured by casting, and the plurality of heat radiation fin parts200is manufactured by cutting a premanufactured metal plate, i.e., an aluminum plate or an aluminum alloy plate.

In the laser welding step, in the state in which the heat radiation fin part200stands and the lower end of the heat radiation fin part200is seated on the heat radiation surface102, the portion between one side surface of the heat radiation fin part200and the heat radiation surface102is irradiated with laser beams in an inclined direction, such that the heat radiation fin part200is fixed onto the heat radiation surface102by laser welding.

In addition, as another example, the plurality of welding coupling parts107protrudes from the heat radiation surface102of the heat sink main body part100in the preparation step, and the plurality of heat radiation fin parts200are respectively coupled to the plurality of welding coupling parts107by laser welding in the laser welding step.

Specifically, in the preparation step, the heat sink main body part100may be manufactured by casting, and the first heat radiation fin support portion110may protrude from the heat radiation surface102of the heat sink main body part100. In this case, in the laser welding step, the lower end of each of the plurality of heat radiation fin parts is disposed at one side of the first heat radiation fin support portion and stands on the heat radiation surface, such that the first heat radiation fin support portion may support one side of each of the plurality of heat radiation fin parts, and one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion may be fixed by laser welding.

Alternatively, in the preparation step, the heat sink main body part100may be manufactured by casting, and the first heat radiation fin support portion110and the second heat radiation fin support portion120may protrude from the heat radiation surface102of the heat sink main body part100and be spaced apart from each other. In this case, in the laser welding step, the lower end of each of the plurality of heat radiation fin parts is inserted between the first heat radiation fin support portion and the second heat radiation fin support portion and stands on the heat radiation surface, such that the first heat radiation fin support portion supports one side of each of the plurality of heat radiation fin parts, the second heat radiation fin support portion supports the other side of each of the plurality of heat radiation fin parts, and one of the portion between one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion and the portion between the other side of each of the plurality of heat radiation fin parts and one side of the second heat radiation fin support portion may be fixed by laser welding.

Alternatively, in the preparation step, the heat sink main body part100may be manufactured by casting, and the support block portion130may protrude from the heat radiation surface102of the heat sink main body part100. In this case, in the laser welding step, the lower end of each of the plurality of heat radiation fin parts may stand on the support block portion and be fixed to the support block portion by laser welding.

Alternatively, in the preparation step, the heat sink main body part100may be manufactured by casting, the support block portion130may protrude from the heat radiation surface102of the heat sink main body part100, the first heat radiation fin support portion110may protrude from one end of the support block portion130, and the second heat radiation fin support portion120may protrude from two opposite ends of the support block portion130and be spaced apart from the first heat radiation fin support portion110. In this case, in the laser welding step, the lower end of each of the plurality of heat radiation fin parts is inserted between the first heat radiation fin support portion and the second heat radiation fin support portion and stands on the support block portion, such that the first heat radiation fin support portion supports one side of each of the plurality of heat radiation fin parts, the second heat radiation fin support portion supports the other side of each of the plurality of heat radiation fin parts, and one of the portion between one side of each of the plurality of heat radiation fin parts and one side of the first heat radiation fin support portion and the portion between the other side of each of the plurality of heat radiation fin parts and one side of the second heat radiation fin support portion may be fixed by laser welding.

For example, in the preparation step, the heat sink main body part100is manufactured by casting, and the first heat radiation fin support portion110and the second heat radiation fin support portion120are manufactured to protrude from the heat radiation surface so that the heat radiation fin part200may be inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120. For example, the laser welding step includes a heat radiation fin assembling step of inserting the heat radiation fin part200between the first heat radiation fin support portion110and the second heat radiation fin support portion120, and a heat radiation fin welding step of laser-welding the heat radiation fin part200by irradiating any one of the first heat radiation fin support portion110and the second heat radiation fin support portion120with laser beams after the heat radiation fin assembling step.

In more detail, in the heat radiation fin welding step, the portion between the first heat radiation fin support portion110and the heat radiation fin part200or the portion between the second heat radiation fin support portion120and the heat radiation fin part200is irradiated with laser beams in an inclined direction, or the portion between the first heat radiation fin support portion110and the heat radiation fin part200and the portion between the second heat radiation fin support portion120and the heat radiation fin part200are simultaneously irradiated with laser beams, such that the heat radiation fin part200is fixed by laser welding.

FIG.11is a photograph illustrating a first test example in which the heat radiation fin part200is laser-welded by the heat sink manufacturing method according to the present invention. In the first test example, fillet welding is performed in a state in which the straight heat radiation fin part200having a thickness of 1 T (mm) stands on the heat radiation surface102of the heat sink main body part100having a thickness of 2 T (mm).

Table 1 below shows a laser welding condition in the first test example in which laser welding is performed by setting the amount of minimum heat input (output).

FIG.11Ais a photograph illustrating an enlarged welded portion, andFIG.11Bis a photograph illustrating a bottom surface of the heat sink main body part100after welding.

With reference toFIG.11A, it can be ascertained that when one side of the heat radiation fin part200is fixed by laser welding in the state in which the lower end of the straight heat radiation fin part200having a thickness of 1 T (mm) is seated directly on the heat radiation surface102of the heat sink main body part100, the rigidity of the laser-welded portion is ensured, but it is difficult to ensure the rigidity of the heat radiation fin part200at a side opposite to the welded portion.

In this case, because the heat radiation fin part200has an insufficient fixing force against a force generated from the welded portion toward the side opposite to the welded portion, there is a risk of the occurrence of damage when the heat radiation fin part200is used. In order to prevent the risk, there is an inconvenience of having to laser-weld both the two opposite sides of the heat radiation fin part200.

In addition, with reference toFIG.11B, it can be ascertained that in case that one side of the heat radiation fin part200is laser-welded in the state in which the lower end of the straight heat radiation fin part200having a thickness of 1 T (mm) is seated directly on the heat radiation surface102of the heat sink main body part100, bending deflection occurs in the portion indicated by the dotted line denoted by reference numeral A on the mounting surface101, which is a bottom surface of the heat sink main body part100, even though the laser welding is performed by setting the amount of minimum heat input (output).

FIG.12is a photograph illustrating a second test example in which the heat radiation fin part200is laser-welded by the heat sink manufacturing method according to the present invention. In the second test example, the support block portion130protrudes from the heat radiation surface of the heat sink main body part100having a thickness of 2 T (mm), the first heat radiation fin support portion110and the second heat radiation fin support portion120each having a thickness of 1 T (mm) protrude from the support block portion130, the lower end of the straight heat radiation fin part200having a thickness of 1 T (mm) is inserted between the first heat radiation fin support portion110and the second heat radiation fin support portion120, and fillet welding is performed by irradiating the portion between the second heat radiation fin support portion120and the heat radiation fin part200with laser beams in an inclined direction.

Table 2 below shows a laser welding condition in the second test example in which laser welding is performed by setting the amount of heat input (output) larger than that in the first test example.

FIG.12Ais a photograph illustrating an enlarged welded portion, andFIG.12Bis a photograph illustrating a bottom surface of the heat sink main body part100after welding.

With reference toFIG.12A, it can be ascertained that the first heat radiation fin support portion110reinforces the rigidity of the side opposite to the laser-welded portion by supporting one side of the heat radiation fin part200that is not laser-welded, and a part of an upper side of the second heat radiation fin support portion120is melted during laser welding, such that the second heat radiation fin support portion120serves as a filler material and further increases the rigidity of the laser-welded portion. In addition, with reference toFIG.12B, it can be ascertained that no bending deflection occurs on the mounting surface101that is the bottom surface of the heat sink main body part100.

As described above, according to the present invention, the heat sink main body part100and the plurality of heat radiation fin parts200are manufactured separately, and then the plurality of heat radiation fin parts200is fixed to the heat sink main body part100by laser welding, such that the thicknesses of and the intervals between the plurality of heat radiation fin parts200may be minimized, the heat dissipation performance may be improved, and the weight may be significantly reduced. In addition, according to the present invention, only the heat sink main body part100is manufactured by casting, which may significantly reduce the production lead time and the manufacturing costs.

A person skilled in the art may understand that the present invention may be carried out in other specific forms without changing the technical spirit or the essential characteristics of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and do not limit the present invention. The scope of the present invention is represented by the claims to be described below rather than the detailed description, and it should be interpreted that the meaning and scope of the claims and all the changes or modified forms derived from the equivalent concepts thereto fall within the scope of the present invention.

INDUSTRIAL APPLICABILITY

The present invention provides the heat sink structure, in which the heat sink main body part and the plurality of heat radiation fin parts are manufactured separately, and the plurality of heat radiation fin parts is fixed to the heat sink main body part by laser welding, such that thicknesses of and intervals between the plurality of heat radiation fin parts may be minimized, and manufacturing costs may be significantly reduced, and a manufacturing method thereof.