KR20240016878A - Heat sink structure and manufacturing method thereof - Google Patents

Abstract

After manufacturing the heat sink main body and the plurality of heat dissipation fin parts separately, the plurality of heat dissipation fin parts are fixed to the heat sink main body by laser welding to form the plurality of heat dissipation fin parts into a plate shape that is thinner and longer than the heat sink main body. A heat sink structure that improves heat dissipation efficiency by securing a sufficient heat dissipation surface and a method of manufacturing the same are provided.
For this purpose, the heat sink structure according to the present invention includes a heat sink main body portion provided on one side with a mounting surface on which a product subject to heat dissipation is located and a heat dissipation surface for dissipating heat on the other side of the heat sink, and the heat sink It includes a plurality of heat dissipation fin parts that stand on the heat dissipation surface of the main body and are joined by laser welding.

Description

Heat sink structure and manufacturing method thereof {HEAT SINK STRUCTURE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a heat sink structure and a method of manufacturing the same, and more specifically, to a heat sink structure in which a heat dissipation fin is joined to a heat sink body by laser welding.

Generally, heat sinks are installed in products that require heat dissipation to effectively dissipate heat.

The heat sink is applied to a variety of products in the electronics, machinery, and automobile industries, such as LED lighting, semiconductor manufacturing equipment, computers, medical equipment, and radiation application machinery, to prevent heat damage, ensure stable operation, and ensure that the heat sink is suitable for the product. It is being modified and applied in various forms.

Typically, the heat sink has a structure in which a heat sink body has a mounting surface on which products requiring heat dissipation are mounted and is equipped with a plurality of heat dissipation fins erected on the opposite side of the mounting surface, thereby dissipating heat generated from the product through heat exchange between the heat dissipation fins and air. It dissipates heat quickly.

Republic of Korea Patent Publication No. 10-0381303 (published on April 26, 2003) (hereinafter referred to as 'prior art') discloses a 'porous heat sink'.

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

However, since the heat sink of the prior art is manufactured by extrusion or casting so that the heat sink and the plurality of heat dissipation fins are formed integrally, it is difficult to reduce the thickness and spacing of the plurality of heat dissipation fins, so the number of the plurality of heat dissipation fins is small. There were problems in that heat dissipation performance was limited and it was difficult to reduce the weight.

In addition, since the heat sink of the prior art is manufactured by extrusion or casting, the mold is designed complexly to form the plurality of heat dissipation fins, which results in high manufacturing costs and the mold must be manufactured separately in a shape suitable for each product. Therefore, it takes a lot of time to design and manufacture the mold, and there is also the problem of a high defect rate during manufacturing.

In particular, since the heat sink of the prior art is manufactured by extrusion or casting, the heat dissipation fin cannot be formed thinner and longer than the heat sink main body, so there is a problem that the heat dissipation efficiency is reduced.

Republic of Korea Patent Publication No. 10-0381303 (2003.04.26. Announcement date)

The problem to be solved by the present invention is to manufacture the heat sink main body and the plurality of heat dissipation fins separately, and then fix the plurality of heat dissipation fins to the heat sink main body by laser welding, thereby attaching the plurality of heat dissipation fins to the heat sink main body. The aim is to provide a heat sink structure that improves heat dissipation efficiency by securing a sufficient heat dissipation surface by forming it into a thin and long plate shape, and a method of manufacturing the same.

Another problem that the present invention aims to solve is to manufacture the heat sink body and the heat dissipation fin separately and then fix the heat dissipation fin to the heat sink main body by laser welding, thereby minimizing the thickness and spacing of the heat dissipation fin and significantly reducing the manufacturing cost. To provide a heat sink structure and a method of manufacturing the same.

The object of the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, the heat sink structure according to the present invention is composed of a heat sink main body portion and a plurality of heat dissipation fin portions. One surface of the heat sink main body is provided with a mounting surface on which a product subject to heat dissipation is located. A heat dissipation surface for dissipating heat is provided on one side and the other side of the heat sink main body. The plurality of heat dissipation fin units are erected on the heat dissipation surface of the heat sink main body and are joined by laser welding.

A plurality of welded joints in which the plurality of heat dissipation fins are respectively joined by laser welding may be formed to protrude on the heat dissipation surface of the heat sink main body.

At the bottom of each of the plurality of heat dissipating fin parts, welding joint protrusions may be formed to be joined to each of the plurality of welding joints by laser welding. The welded joint protrusion may be formed to be thicker than the thickness of each of the plurality of heat dissipation fin parts.

The plurality of welded joints may be formed in a round shape in which both sides of a starting end of a portion protruding from the heat dissipation surface of the heat sink main body are concave. The plurality of welded joints may be formed in a round shape with both sides of the ends in the protruding direction being convex.

Each of the plurality of welded joints may be composed of a first heat dissipation fin support portion. The first heat dissipation fin support portion may be formed to protrude on the heat dissipation surface. The welded engagement protrusion may be erected on the heat dissipation surface on one side of the first heat dissipation fin support portion. One side of the welding engagement protrusion may be joined to one side of the first heat dissipation fin support portion by laser welding.

Each of the plurality of welded joints may be composed of a first heat dissipation fin support portion and a second heat dissipation fin support portion. The first heat radiation fin support portion and the second heat radiation fin support portion may be erected on the heat radiation surface by inserting the welding engaging protrusion between the first heat radiation fin support portion and the second heat radiation fin support portion. At least one side of the welding engagement protrusion may be coupled to at least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion through laser welding.

Each of the plurality of welded joints may be composed of a support block portion. The support block portion may be formed to protrude on the heat dissipation surface. The welded joint protrusion may be erected on the support block portion. At least one side of the welding engagement protrusion may be coupled to the support block by laser welding.

Each of the plurality of welded joints may be composed of a support block part, a first heat dissipation fin support part, and a second heat dissipation fin support part. The support block portion may be formed to protrude on the heat dissipation surface. The first heat dissipation fin support portion may be formed to protrude from one end of the support block portion. The second heat dissipation fin support portion may be formed to protrude from the other end of the support block portion to be spaced apart from the first heat dissipation fin support portion. The welding engagement protrusion may be inserted between the first heat dissipation fin support portion and the second heat dissipation fin support portion and may be erected on the support block portion. At least one side of the welding engagement protrusion may be coupled to at least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion through laser welding.

One side of the first heat dissipation fin support portion and one side of the welding engagement protrusion may be formed in a block round shape.

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

At least one side of the welding engagement protrusion may be formed in a convex round shape.

The convex round shape may be a shape that allows the laser to be irradiated at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fins during laser welding.

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

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

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

In order to achieve the above problem, the method of manufacturing a heat sink structure according to the present invention consists of a preparation step and a laser welding step. In the preparation step, the heat sink main body and the plurality of heat dissipation fins are manufactured separately. One surface of the heat sink main body is provided with a mounting surface on which a product subject to heat dissipation is located. A heat dissipation surface for dissipating heat is provided on one side and the other side of the heat sink main body. The plurality of heat dissipation fins function to dissipate heat. In the laser welding step, the plurality of heat dissipation fins are spaced apart from each other and fixed to the heat dissipation surface of the heat sink main body by laser welding.

In the preparation step, the heat sink main body can be manufactured by casting, and the plurality of heat dissipation fin parts can be manufactured by cutting a previously manufactured metal plate.

In the preparation step, a plurality of welded joints may be formed to protrude on the heat dissipation surface of the heat sink main body. In the preparation step, welded joint protrusions thicker than the thickness of each of the plurality of heat dissipation fin parts may be formed at the bottom of each of the plurality of heat dissipation fin parts. In the laser welding step, the welding joint protrusions may be joined to each of the plurality of welding joints by laser welding.

Specific details of other embodiments are included in the detailed description and drawings.

The heat sink structure and its manufacturing method according to the present invention include manufacturing the heat sink main body and the plurality of heat dissipation fin parts separately, and then fixing the plurality of heat dissipation fin parts to the heat sink main body by laser welding, Compared to the heat sink main body, it is formed in a thinner and longer plate shape, which has the effect of improving heat dissipation efficiency by securing a sufficient heat dissipation surface.

In addition, the heat sink structure and its manufacturing method according to the present invention are manufactured separately from the heat sink main body and the plurality of heat dissipating fin parts, and then fixing the plurality of heat dissipating fin parts to the heat sink main body by laser welding, thereby forming the plurality of heat dissipating fin parts. It also has the effect of minimizing the thickness and spacing of heat dissipation fins and significantly reducing manufacturing costs.

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.

1 is a perspective view showing a heat sink structure according to an embodiment of the present invention;
Figure 2 is a rear perspective view of Figure 1;
Figure 3 is an exploded perspective view of Figure 2 disassembled into the heat sink main body and a plurality of heat dissipation fins;
Figure 4 is a partial enlarged view of Figure 2;
Figure 5 is a partial plan view of Figures 1 and 2;
Figure 6 is a partial enlarged view of Figure 5;
Figure 7 is an exploded view of Figure 6;
8 is a diagram showing a heat sink structure according to another embodiment of the present invention;
Figure 9 is a photograph taken of the first test example of laser welding the heat dissipation fin portion in the method of manufacturing the heat sink structure according to the present invention;
Figure 10 is a photograph taken of a second test example in which the heat dissipation fin portion was laser welded in the method of manufacturing a heat sink structure according to the present invention.

Hereinafter, the heat sink structure and its manufacturing method according to an embodiment of the present invention will be described with reference to the drawings.

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

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

The heat sink structure according to an embodiment of the present invention is manufactured by manufacturing the heat sink main body 100 by casting, and manufacturing a plurality of heat dissipation fin parts 200 separately from the heat sink main body 100. ) can be manufactured by combining a plurality of heat dissipation fin parts 200 by laser welding.

One surface of the heat sink main body 100 may be provided with a mounting surface 101 on which a product subject to heat dissipation is located. Here, the product may include electronic components that generate a certain amount of heat while operating when power is supplied. That is, the product may be a printed circuit board equipped with Rx and Tx elements that are responsible for outputting and transmitting signals in an antenna device, or it may be a box in which the printed circuit board is accommodated.

Accordingly, a receiving space 105 in which the product is accommodated may be formed on the mounting surface 101 of the heat sink main body 100. However, the receiving space 105 does not necessarily have to be formed. In this case, the heat sink main body 100 may be formed in a plate shape, and the product is in surface contact with the mounting surface 101 of the heat sink main body 100. It can be arranged accordingly.

The other surface of the heat sink main body 100 may be a heat dissipation surface 102 on which a plurality of heat dissipation fin parts 200 that dissipate heat through heat exchange are fixed.

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

The plurality of heat dissipation fin parts 200 may perform a heat dissipation function by dissipating heat generated from the product to the outside of the heat sink main body part 100. The plurality of heat dissipation fin parts 200 may be formed in a plate shape thinner than the heat sink main body 100. The standing length (L1) of each of the plurality of heat dissipation fin parts 200 may be longer than the length (L2) from the mounting surface 101 of the heat sink main body 100 to the heat dissipation surface 102. As an example, the plurality of heat dissipation fin parts 200 may have a straight panel shape, but may also be manufactured in various shapes such as a curved panel shape or a stick shape.

As an example, the heat sink body portion 100 and the heat dissipation fin portion 200 are made of aluminum or an aluminum alloy material. In addition, the heat sink may be made of various materials known to have excellent thermal conductivity.

In addition, the heat sink main body 100 is manufactured in a pre-designed form by casting, and the heat dissipation fin part 200 is manufactured by cutting a flat, straight aluminum or aluminum alloy panel into a pre-designed size.

On the heat dissipation surface 102 of the heat sink main body 100, a plurality of welded joint portions 107 in which the plurality of heat dissipation fin portions 200 are respectively joined by laser welding may be formed to protrude.

However, the welded joint portion 107 may not be formed on the heat dissipation surface 102 of the heat sink main body 100. In this case, the plurality of heat dissipation fin parts 200 may be positioned to stand and be seated on the heat dissipation surface 102 of the heat sink main body 100. While seated on the heat dissipation surface 102 of the heat sink main body 100, it may be fixed on the heat dissipation surface 102 of the heat sink main body 100 through laser welding.

Laser welding is performed with the end of the heat dissipation fin portion 200 seated on the heat dissipation surface 102 of the heat sink main body 100, that is, the boundary line between the heat sink main body 100 and the heat dissipation fin portion 200, that is, the heat dissipation surface ( The heat dissipation fin part 200 can be fixed to the heat dissipation surface 102 of the heat sink main body 100 by laser welding by irradiating a laser onto one edge of the heat dissipation fin part 200 that meets the heat dissipation fin part 200.

The plurality of welded joints 107 may be formed such that the thickness L3 of the starting end of the portion protruding from the heat dissipation surface 102 of the heat sink main body 100 is smaller than the thickness L4 of the end in the protruding direction. there is.

Specifically, the plurality of welded joints 107 may be formed to have a width that becomes smaller as it moves toward the end in the protruding direction from the heat dissipation surface 102 of the heat sink main body 100. Through this, since laser welding is possible even at a low laser irradiation angle during laser welding, the space between the plurality of heat dissipation fins 200 on the heat sink 102 of the heat sink main body 100 is narrowed. By installing more, heat dissipation performance can be improved.

Referring to Figures 6 and 7, the plurality of welded joints 107 are formed in a round shape (R1, R2) in which both sides of the starting end of the portion protruding from the heat dissipation surface 102 of the heat sink main body 100 are concave. It can be. Additionally, the plurality of welded joints 107 may be formed in a round shape (R3, R4) in which both sides of the ends in the protruding direction are convex. The radii of curvature of the round shapes (R1, R2) may be the same, and the radii of curvature of the round shapes (R3, R4) may be the same. The radius of curvature of the round shapes (R1, R2) may be formed to be larger than the radius of curvature of the round shapes (R3, R4).

Welding coupling protrusions 210 may be formed at the lower ends of each of the plurality of heat dissipation fin parts 200, which are joined to the welding coupling portion 107 by laser welding. The welded joint protrusion 210 may be formed to be thicker than the thickness t1 of each of the plurality of heat dissipation fin parts 200. The welded joint protrusions 210 may be formed to protrude from the bottom of each of the plurality of heat dissipation fin parts 200 to both sides.

Meanwhile, each of the plurality of welded joints 107 may include a first heat dissipation fin support part 110, a second heat dissipation fin support part 120, and a support block part 130. However, the welded joint 107 may be formed only of the first heat dissipation fin support part 110, or may be formed only of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120, and the support block part 130 It can also be formed only.

When each of the plurality of welded joints 107 is formed of the first heat dissipation fin support part 110, the second heat dissipation fin support part 120, and the support block part 130, the support block part 130 is located on the heat dissipation surface 102. It may be formed to protrude, and the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 may be formed to protrude and be spaced apart from each other at both ends of the support block part 130. That is, the first heat radiation fin support portion 110 may be formed to protrude from one end of the support block portion 130, and the second heat radiation fin support portion 120 may be formed to protrude from the other end of the support block portion 130. ) may be formed to protrude away from the

In this case, the welded engagement protrusion 210 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and erected on the support block portion 130, and at least one side of the weld engagement protrusion 210 It may be joined to one side of at least one of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 by laser welding.

In addition, at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and at least one side of the welding engagement protrusion 210 may be formed in a convex round shape (R5, R6, R7, R8). You can. Here, the convex round shape (R5, R6, R7, R8) may be a shape that can irradiate the laser at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during laser welding.

During the laser welding, when the laser can be irradiated at an angle smaller than 3° to each of the plurality of heat dissipation fin parts 200, the thickness of the laser welding is thin so that the heat dissipation fin part 200 is firmly attached to the first heat dissipation fin support part 110. They may not be combined, and in the case where the laser can be irradiated to a greater than 7° angle to each of the plurality of heat dissipation fin parts 200 during the laser welding, the gap between the plurality of heat dissipation fin parts 200 is widened, so that the plurality of heat dissipation fin parts 200 ) is reduced, so heat dissipation performance may deteriorate. Therefore, it is preferable that the convex round shape (R5, R6, R7, R8) has a shape that allows laser irradiation at an angle of 3 to 7 degrees during laser welding.

When each of the plurality of welded joints 107 is formed only with the first heat dissipation fin support part 110, the first heat dissipation fin support part 110 may be formed to protrude on the heat dissipation surface 102.

In this case, the welded engaging protrusion 210 may be erected on the heat dissipating surface 102 on one side of the first heat dissipating fin support portion 110, and one side of the welded engaging protrusion 210 may be positioned on one side of the first heat dissipating fin support portion 110. Can be joined by laser welding.

Additionally, one side of the first heat dissipation fin support portion 110 and one side of the welded joint protrusion 210 may be formed in a convex round shape (R5, R7). Here, the convex round shape (R5, R7) may be a shape that can irradiate the laser at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during laser welding.

During the laser welding, when the laser can be irradiated at an angle smaller than 3° to each of the plurality of heat dissipation fin parts 200, the thickness of the laser welding is thin so that the heat dissipation fin part 200 is firmly attached to the first heat dissipation fin support part 110. They may not be combined, and in the case where the laser can be irradiated to a greater than 7° angle to each of the plurality of heat dissipation fin parts 200 during the laser welding, the gap between the plurality of heat dissipation fin parts 200 is widened, so that the plurality of heat dissipation fin parts 200 ) is reduced, so heat dissipation performance may deteriorate. Therefore, it is preferable that the convex round shapes (R5, R7) have a shape that allows laser irradiation at an angle of 3 to 7 degrees during laser welding.

When each of the plurality of welded joints 107 is formed only of the first heat radiation fin support portion 110 and the second heat radiation fin support portion 120, the first heat radiation fin support portion 110 and the second heat radiation fin support portion 120 are formed on the heat radiation surface 102. ) may be formed protruding on the surface.

In this case, the welded engagement protrusion 210 may be inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and erected on the heat dissipation surface 102, and at least one side of the weld engagement protrusion 210 may be 1 It may be joined to one side of at least one of the heat dissipation fin support part 110 and the second heat dissipation fin support part 120 by laser welding.

In addition, at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and at least one side of the welding engagement protrusion 210 may be formed in a convex round shape (R5, R6, R7, R8). You can. Here, the convex round shape (R5, R6, R7, R8) may be a shape that can irradiate the laser at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during laser welding.

During the laser welding, when the laser can be irradiated at an angle smaller than 3° to each of the plurality of heat dissipation fin parts 200, the thickness of the laser welding is thin so that the heat dissipation fin part 200 is firmly attached to the first heat dissipation fin support part 110. They may not be combined, and in the case where the laser can be irradiated to a greater than 7° angle to each of the plurality of heat dissipation fin parts 200 during the laser welding, the gap between the plurality of heat dissipation fin parts 200 is widened, so that the plurality of heat dissipation fin parts 200 ) is reduced, so heat dissipation performance may deteriorate. Therefore, it is preferable that the convex round shape (R5, R7, R7, R8) is a shape that allows laser irradiation at an angle of 3 to 7 degrees during laser welding.

When each of the plurality of welded joints 107 is formed only with the support block portion 130, the support block portion 130 may be formed to protrude on the heat dissipation surface 102.

In this case, the welded engagement protrusion 210 may be erected on the support block portion 130, and at least one side of the welded engagement protrusion 210 may be coupled to the support block portion 130 by laser welding.

Additionally, at least one side of the welding engagement protrusion 210 may be formed into a convex round shape (R7, R8). Here, the convex round shape (R7, R8) may be a shape that can irradiate the laser at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fin parts 200 during laser welding.

During the laser welding, when the laser can be irradiated at an angle smaller than 3° to each of the plurality of heat dissipation fin parts 200, the thickness of the laser welding is thin so that the heat dissipation fin part 200 is firmly attached to the first heat dissipation fin support part 110. They may not be combined, and in the case where the laser can be irradiated to a greater than 7° angle to each of the plurality of heat dissipation fin parts 200 during the laser welding, the gap between the plurality of heat dissipation fin parts 200 is widened, so that the plurality of heat dissipation fin parts 200 ) is reduced, so heat dissipation performance may deteriorate. Therefore, it is preferable that the convex round shapes (R7, R8) have a shape that allows laser irradiation at an angle of 3 to 7 degrees during laser welding.

The radii of curvature of the round shapes (R5, R6) may be the same, and the radii of curvature of the round shapes (R7, R8) may be the same. The radius of curvature of the round shape (R5, R6) may be the same as the radius of curvature of the round shape (R3, R4). The radius of curvature of the round shape (R7, R8) may be smaller than the radius of curvature of the round shape (R5, R6).

The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 are spaced apart with a gap equal to or slightly larger than the thickness t1 of the heat dissipation fin portion 200, so that the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 110 The heat dissipation fin portion 200 may be inserted between the support portions 120.

The first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 are spaced apart at a distance of 1 to 1.2 times the thickness (t1) of the heat dissipation fin support part 200, so that the first heat dissipation fin support part 110 and the second heat dissipation fin support part 110 The heat dissipation fin portion 200 may be inserted between the support portions 120.

In addition, the thickness (t2) of the first heat dissipation fin support portion 110 and the thickness (t3) of the second heat dissipation fin support portion 120 may be equal to, slightly greater than, or less than the thickness (t1) of each of the plurality of heat dissipation fin portions 200. You can. In more detail, the thickness (t2) of the first heat radiation fin support portion 110 and the thickness (t3) of the second heat radiation fin support portion 120 are 0.7 to 1.1 times the thickness (t1) of each of the plurality of heat radiation fin portions 200. can be formed.

The first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 support both sides of the heat dissipation fin part 200, which is fixed by laser welding, and serve to increase the fixing force of the heat dissipation fin part 200 during laser welding. It can be melted and serve as a filler metal.

One side of either the first heat radiation fin support portion 110 or the second heat radiation fin support portion 120 is melted during laser welding and serves as a filler material. In this case, the thickness (t2) of the first heat radiation fin support portion 110 and the second heat radiation fin support portion are If the thickness (t3) of (120) is greater than 1.1 times the thickness (t1) of each of the plurality of heat dissipation fin parts 200, it is difficult to serve as a filler material during laser welding, and the thickness (t2) of the first heat dissipation fin support part 110 is difficult. And if the thickness (t3) of the second heat dissipation fin support portion 120 is less than 0.7 times smaller than the thickness (t1) of each of the plurality of heat dissipation fin portions 200, the rigidity supporting the heat dissipation fin portion 200, that is, on the opposite side of the welded portion, There is a problem of insufficient rigidity. Accordingly, the thickness (t2) of the first heat radiation fin support portion 110 and the thickness (t3) of the second heat radiation fin support portion 120 are formed to be 0.7 to 1.1 times the thickness (t1) of each of the plurality of heat radiation fin portions 200. desirable.

In addition, the height (h) of the first heat radiation fin support portion 110 and the height (h) of the second heat radiation fin support portion 120 may be formed to be 1 to 2 times the thickness (t1) of each of the plurality of heat radiation fin portions 200. .

If the height (h) of the first heat dissipation fin support part 110 and the height (h) of the second heat dissipation fin support part 120 are smaller than the thickness (t1) of each of the plurality of heat dissipation fin parts 200, each of the plurality of heat dissipation fin parts 200 The rigidity supporting both sides may be insufficient, and 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 lower than the thickness (t1) of each of the plurality of heat dissipation fin portions 200. ), if it is more than twice as large, it may cause the heat dissipation effect to deteriorate. Therefore, it is preferable that the height (h) of the first heat radiation fin support portion 110 and the height (h) of the second heat radiation fin support portion 120 are formed to be 1 to 2 times the thickness (t1) of each of the plurality of heat radiation fin portions 200. do.

The support block unit 130 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100. The support block unit 130 may connect the lower end of the first heat dissipation fin support part 110 and the lower end of the second heat dissipation fin support part 120, and the heat dissipation surface 120 of the heat sink main body part 100. The first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to protrude from an end of the support block portion 130.

The minimum thickness of the support block portion 130 is formed to be 2.4 to 3.3 times the thickness (t1) of each of the plurality of heat dissipation fin portions 200, which is the support block for the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120. It is a thickness that can be stably formed at the end of the portion 130 and is a thickness that does not affect the spacing between the plurality of heat dissipation fin portions 200.

That is, if the minimum thickness (t4) of the support block portion 130 is less than 2.4 times smaller than the thickness (t1) of each of the plurality of heat dissipation fin portions 200, the thickness (t2) of the first heat dissipation fin support portion 110 and the second If the thickness t3 of the heat dissipation fin support part 120 cannot be sufficiently formed, and the thickness t4 of the support block part 130 is more than 3.3 times greater than the thickness t1 of each of the plurality of heat dissipation fin parts 200, heat occurs. Since the number of heat dissipation fin parts 200 installed in the sink main body 100 is small, there may be a problem in that heat dissipation performance is deteriorated. Accordingly, the thickness t4 of the support block portion 130 is preferably formed to be 2.4 to 3.3 times the thickness t1 of each of the plurality of heat dissipation fin portions 200.

The support block unit 130 positions the heat dissipation fins 200 apart from each other on the heat dissipation surface 102 of the heat sink main body 100, and the laser welded portion is positioned on the heat dissipation surface 102 of the heat sink main body 100. By positioning it above the pre-designed height, it is possible to prevent the mounting surface 101 of the heat sink main body 100 from being bent by heat after laser welding.

During laser welding, either the first heat dissipation fin support portion 110 or the second heat dissipation fin support portion 120 serves as a filler material that is melted together with the heat dissipation fin portion 200, and after laser welding, the heat dissipation fin portion 200 is formed through laser welding. It may be fixed between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120.

The heat dissipation fin portion 200 is inserted between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 and then laser welded on one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120. This allows it to be firmly fixed between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120.

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

Figure 8 is a diagram showing a heat sink structure according to another embodiment of the present invention.

Referring to FIG. 8, the heat sink structure according to another embodiment of the present invention has a welded joint protrusion 210 formed at the bottom of each of the plurality of heat dissipation fin parts 200 at the bottom of each of the plurality of heat dissipation fin parts 200. It may protrude to one side. In this embodiment, the welded engaging protrusion 210 is bent to protrude from the bottom of each of the plurality of heat dissipating fin parts 200 to one side, so that the overall shape formed by the heat dissipating fin part 200 and the welded engaging protrusion 210 can be formed into an L shape. there is.

Additionally, in the heat sink structure according to another embodiment of the present invention, the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 may be formed to have different heights. That is, the height of the first heat dissipation fin support part 110 may be formed to be higher than the height of the second heat dissipation fin support part 120, and the height of the second heat dissipation fin support part 120 may be formed shorter than the height of the first heat dissipation fin support part 120. It can be.

In addition, the welding engaging protrusion 210 may be inserted between the first heat dissipating fin support part 110 and the second heat dissipating fin support part 120, and one side of the welding engaging protrusion 210 is attached to one side of the second heat dissipating fin support part 120. Can be joined by welding. One side of the lower end of the heat dissipation fin portion 200 located on the opposite side of the welding coupling protrusion 210 may be supported by one side of the first heat dissipation fin support portion 110.

In addition, the second heat radiation fin support portion 120 formed in one of the welded joints 107 is the first heat radiation fin support portion 110 formed in a welded joint 107 adjacent to the one welded joint 107. It can be formed integrally with. However, the second heat radiation fin support portion 120 formed in one of the welded joints 107 may be formed to be spaced apart from the first heat radiation fin support portion 110 formed in the neighboring welded joint 107.

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

In the preparation step, the heat sink main body 100 and the plurality of heat dissipation fin parts 200 can be manufactured separately.

The laser welding step may be performed after the preparation step. In the laser welding step, the plurality of heat dissipation fin parts 200 may be fixed to the heat dissipation surface 102 of the heat sink main body 100 by laser welding to be spaced apart from each other.

In the preparation step, the heat sink main body 100 can be manufactured by casting, and the plurality of heat dissipation fin parts 200 can be manufactured by cutting a previously manufactured metal plate. Here, the previously manufactured metal plate may be an aluminum plate or an aluminum alloy plate.

In the laser welding step, the plurality of heat dissipation fin parts 200 are each erected, and the lower ends of each of the plurality of heat dissipation fin parts 200 are seated on the heat dissipation surface 102, and one side and the heat dissipation fin part 200 are separated from each other. The heat dissipation fin portion 200 can be fixed to the heat dissipation surface 102 by laser welding by irradiating a laser obliquely between the heat dissipation surfaces 102.

In addition, in the preparation step, a plurality of welded joints 107 may be protrudingly formed on the heat dissipating surface 102 of the heat sink main body 100, and a plurality of welded joints may be formed at each lower end of the plurality of heat dissipating fin portions 200. Protrusions 210 may be formed. Additionally, in the laser welding step, the welding joint protrusions 210 may be respectively joined to the plurality of welded joints 107 by laser welding.

Specifically, in the preparation step, the heat sink main body 100 is manufactured by casting, and the first heat dissipation fin support part 110 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100. . In this case, in the laser welding step, the welding engaging protrusion 210 may be erected on the heat dissipating surface 102 on one side of the first heat dissipating fin support part 110, and one side of the welding engaging protrusion 210 may be formed on the first heat dissipating fin support part ( 110) can be joined to one side by laser welding.

Alternatively, in the preparation step, the heat sink main body 100 is manufactured by casting, and the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 are formed on the heat dissipation surface 102 of the heat sink main body 100. They may be formed to protrude and be spaced apart from each other. In this case, in the laser welding step, the welding engaging protrusion 210 may be inserted between the first heat dissipating fin support part 110 and the second heat dissipating fin support part 120 and erected on the heat dissipating surface 102, and the welding engaging protrusion 210 At least one side of may be coupled to at least one side of the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 by laser welding.

Alternatively, in the preparation step, the heat sink main body 100 may be manufactured by casting, and the support block 130 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100. In this case, in the laser welding step, the welding engaging protrusion 210 may be erected on the support block 130, and at least one side of the welding engaging protrusion 210 may be coupled to the supporting block 130 by laser welding. there is.

Alternatively, in the preparation step, the heat sink main body 100 may be manufactured by casting, and a support block 130 may be formed to protrude on the heat dissipation surface 102 of the heat sink main body 100, and the support block 130 may be formed to protrude. A first heat dissipation fin support portion 110 may be formed to protrude at one end of the support block portion 130, and a second heat dissipation fin support portion 120 may be protruded at a distance from the first heat dissipation fin support portion 110 at the other end of the support block portion 130. can be formed. In this case, in the laser welding step, the welding coupling protrusion 210 may be inserted between the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 and erected on the support block part 130, and the welding coupling protrusion 210 ) may be coupled to at least one side of the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120 by laser welding.

Meanwhile, the welded joint protrusion 210 does not necessarily have to be formed at the bottom of each of the plurality of heat dissipation fin parts 200. That is, the welding engaging protrusion 210 may not be formed at the lower end of each of the plurality of heat dissipating fin parts 200, and in this case, the lower end of each of the plurality of heat dissipating fin parts 200 is laser welded on the heat dissipating surface 102. It can be directly coupled or directly coupled to the weld joint 107 by laser welding.

For example, in the preparation step, the heat sink main body 100 is manufactured by casting, the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 are manufactured to protrude on the heat dissipation surface 102, and the heat dissipation fin support part 110 is manufactured to protrude on the heat dissipation surface 102. The welding step may include a heat dissipation fin assembling step of inserting the lower end of the heat dissipation fin portion 200 between the first heat dissipation fin support portion 110 and the second heat dissipation fin support portion 120, and the laser welding step may include the first heat dissipation fin support step 110 and the second heat dissipation fin support 120. It may include a heat radiation fin welding step of laser welding the lower end of the heat radiation fin portion 200 by irradiating a laser from one side of the heat radiation fin support portion 110 and the second heat radiation fin support portion 120.

In more detail, the heat dissipation fin welding step is performed by using a laser at one of the lower ends of the first heat dissipation fin support portion 110 and the heat dissipation fin portion 200 and the second heat dissipation fin support portion 120 and the lower end of the heat dissipation fin portion 200. The heat dissipation fin portion 200 is irradiated obliquely or simultaneously irradiates the laser obliquely between the first heat dissipation fin support portion 110 and the lower end of the heat dissipation fin portion 200 and between the second heat dissipation fin support portion 120 and the lower end of the heat dissipation fin portion 200. ) can be fixed by laser welding.

Figure 9 is a photograph taken of the first test example of laser welding the heat dissipation fin portion 200 in the manufacturing method of the heat sink structure 1 according to the present invention. The first test example is a straight heat dissipation fin portion 200 with a thickness of 1 mm. ) was placed on the heat dissipation surface 102 of the heat sink main body 100 with a thickness of 2 mm and fillet welding was performed.

Table 1 below illustrates the laser welding conditions in the first test example, and is an example in which laser welding was performed by setting the minimum amount of heat input (output).

Wavelength Mode Power Speed Frequency Wobble length 1070nm Continuous wave 900w 50mm/s 100Hz 1mm

Figure 9 (a) is an enlarged photograph of the welded portion, and Figure 9 (b) is a photograph taken of the bottom surface of the heat sink main body 100 after welding.

Referring to (a) of FIG. 9, the lower end of the straight heat dissipation fin portion 200 with a thickness of 1 mm is directly seated on the heat dissipation surface 102 of the heat sink main body 100, and one side of the heat dissipation fin portion 200 is When fixed by laser welding, the rigidity of the laser welded area is secured, but it can be confirmed that the rigidity of the heat dissipation fin portion 200 on the opposite side of the welded area is difficult to secure.

In this case, there is a risk that the heat radiation fin portion 200 may be damaged during use due to insufficient fixing force against the force generated from the side of the welded portion toward the side opposite to the welded portion. To prevent this, both sides of the heat radiation fin portion 200 must be closed. The inconvenience of having to do laser welding arises.

In addition, referring to (b) of FIG. 9, the lower end of the straight heat dissipation fin portion 200 with a thickness of 1 mm is directly seated on the heat dissipation surface 102 of the heat sink main body 100, and the heat dissipation fin portion 200 In the case of laser welding one side, even when laser welding is performed by setting the minimum heat input (output), bending deformation occurs within the dotted line indicated by reference numeral A on the mounting surface 101, which is the bottom surface of the heat sink main body 100. You can confirm that this has occurred.

Figure 10 is a photograph taken of a second test example in which the heat dissipation fin portion 200 was laser welded in the heat sink manufacturing method according to the present invention. The second test example was on the heat dissipation surface of the heat sink main body portion 100 of 2 mm. The support block part 130 protrudes, and the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 with a thickness of 1 mm protrude on the support block part 130, and the first heat dissipation fin support part 110 and the second heat dissipation fin support part 120 2 The lower end of the straight heat dissipation fin portion 200 with a thickness of 1 mm was inserted between the heat dissipation fin supports 120, and fillet welding was performed by irradiating a laser obliquely between the second heat dissipation fin support portion 120 and the heat dissipation fin portion 200. will be.

Table 2 below illustrates the laser welding conditions in the second test example, and is an example in which laser welding was performed by setting a larger heat input (output) than the first test example.

Wavelength Mode Power Speed Frequency Wobble length 1070 nm Continuous wave 1250w 70mm/s 200Hz 0.4mm

Figure 10 (a) is an enlarged photograph of the welded portion, and Figure 10 (b) is a photograph taken of the bottom surface of the heat sink main body 100 after welding.

Referring to (a) of FIG. 10, the first heat radiation fin support portion 110 supports the non-laser welded side of the heat radiation fin portion 200 to reinforce the rigidity of the side opposite to the laser welded portion, and the second heat radiation fin support portion 120 It can be seen that during laser welding, a portion of the upper side is melted and acts as a filler agent, while further increasing the rigidity of the laser welded area. In addition, referring to (b) of FIG. 10, it can be seen that no bending deformation occurs on the mounting surface 101, which is the bottom surface of the heat sink main body 100.

As described above, in the heat sink structure 1 and its manufacturing method according to an embodiment of the present invention, the heat sink main body 100 and the plurality of heat dissipation fin parts 200 are manufactured separately, and then a plurality of heat dissipation fin parts ( 200) is fixed to the heat sink main body 100 by laser welding, and a plurality of heat dissipation fin parts 200 are formed in a plate shape that is thinner and longer than the heat sink main part 100, thereby improving heat dissipation efficiency by securing a sufficient heat dissipation surface. It can be.

In addition, the heat sink structure 1 and its manufacturing method according to an embodiment of the present invention separately manufacture the heat sink main body 100 and the plurality of heat dissipation fin parts 200, and then manufacture the heat sink main body 100 and the plurality of heat dissipation fin parts 200 separately. is fixed to the heat sink main body 100 by laser welding, thereby minimizing the thickness and spacing of the plurality of heat dissipation fin parts 200 and significantly reducing manufacturing costs.

A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: Heat sink main body 101: Mounting surface
102: heat dissipation surface 105: accommodation space
107: welded joint 110: first heat dissipation fin support portion
120: second heat dissipation fin support part 130: support block part
200: heat dissipation fin portion 210: welded joint protrusion

Claims (20)

A heat sink main body having a mounting surface on one side on which a product to be heat dissipated is located, and a heat dissipation surface for dissipating heat on the other side of the heat sink body; and
A heat sink structure comprising a plurality of heat dissipation fin parts that stand on the heat dissipation surface of the heat sink main body and are joined by laser welding. In claim 1,
A heat sink structure in which a plurality of welded joints in which the plurality of heat dissipation fins are respectively joined by laser welding are protrudingly formed on the heat dissipation surface of the heat sink main body. In claim 2,
A heat sink structure in which a welded joint protrusion, which is joined to each of the plurality of welded joints by laser welding, is formed at a lower end of each of the plurality of heat dissipating fin portions and is thicker than the thickness of each of the plurality of heat dissipating fin portions. In claim 2,
A heat sink structure wherein the plurality of welded joints are formed in a concave round shape on both sides of a starting end of a portion protruding from the heat dissipation surface of the heat sink main body, and are formed in a round shape in which both sides of an end in the protruding direction are convex. In claim 3,
Each of the plurality of welded joints includes a first heat dissipation fin support portion protruding from the heat dissipation surface,
The heat sink structure wherein the welded engagement protrusion is erected on the heat dissipation surface at one side of the first heat dissipation fin support portion, and one side of the weld engagement protrusion is coupled to one side of the first heat dissipation fin support portion by laser welding. In claim 3,
Each of the plurality of welded joints includes a first heat dissipation fin support portion and a second heat dissipation fin support portion protruding from the heat dissipation surface,
The welding engaging protrusion is inserted between the first heat dissipating fin support part and the second heat dissipating fin support part and stands on the heat dissipating surface, and at least one side of the welding engaging protrusion is at least one side of the first heat dissipating fin support part and the second heat dissipating fin support part. Heat sink structure joined by laser welding. In claim 3,
Each of the plurality of welded joints includes a support block portion protruding from the heat dissipation surface,
A heat sink structure wherein the welding engaging protrusion is erected on the support block portion, and at least one side of the welding engaging protrusion is coupled to the support block portion by laser welding. In claim 3,
Each of the plurality of weld joints,
a support block portion protruding from the heat dissipation surface;
a first heat dissipation fin support portion protruding from one end of the support block portion; and
It includes a second heat dissipation fin support portion protruding from the other end of the support block portion and spaced apart from the first heat dissipation fin support portion,
The welding engaging protrusion is inserted between the first heat dissipating fin support part and the second heat dissipating fin support part and stands on the support block part, and at least one side of the welding engaging protrusion is connected to at least one of the first heat dissipating fin support part and the second heat dissipating fin support part. A heat sink structure joined on one side by laser welding. In claim 5,
A heat sink structure in which one side of the first heat dissipation fin support portion and one side of the welded joint protrusion are formed in a block round shape. In claim 6,
A heat sink structure wherein at least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion and at least one side of the welding engagement protrusion are formed in a convex round shape. In claim 7,
A heat sink structure in which at least one side of the welded joint protrusion is formed in a convex round shape. In claim 8,
A heat sink structure wherein at least one side of the first heat dissipation fin support portion and the second heat dissipation fin support portion and at least one side of the welding engagement protrusion are formed in a convex round shape. According to any one of claims 9 to 12,
The convex round shape is a heat sink structure that can irradiate a laser at an angle of 3 to 7 degrees to each of the plurality of heat dissipation fins during laser welding. In claim 5,
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,
A heat sink structure in which 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. In claim 6,
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,
A heat sink structure in which the height of the first heat dissipation fin support part and the height of the second heat dissipation fin support part are formed to be 1 to 2 times the thickness of each of the plurality of heat dissipation fin parts. In claim 7,
A heat sink structure in which the minimum thickness of the support block portion is 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions. In claim 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 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,
A heat sink structure in which the minimum thickness of the support block portion is 2.4 to 3.3 times the thickness of each of the plurality of heat dissipation fin portions. A preparatory step of separately manufacturing a heat sink main body having a mounting surface on one side of which a product subject to heat dissipation is located and a heat dissipating surface for dissipating heat on one side and the other side, and a plurality of heat dissipating fins that function to dissipate heat; and
A method of manufacturing a heat sink structure comprising a laser welding step of fixing the plurality of heat dissipation fins to the heat dissipation surface of the heat sink main body by laser welding to be spaced apart from each other. In claim 18,
In the preparation stage,
The heat sink main body is manufactured by casting,
A method of manufacturing a heat sink structure in which the plurality of heat dissipation fins are manufactured by cutting a previously manufactured metal plate. In claim 18,
In the preparation step, a plurality of welded joints are protrudingly formed on the heat dissipating surface of the heat sink main body, and welded joint protrusions thicker than the thickness of each of the plurality of heat dissipating fin portions are formed at the bottom of each of the plurality of heat dissipating fin portions,
In the laser welding step, the welding joint protrusion is each connected to the plurality of welding joints by laser welding.

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