JP7033470B2 - How to make a heat sink - Google Patents

Description

The present invention relates to a method for manufacturing a heat sink in which the heat sink is formed by mold forging and a related technique thereof. In the present invention, the term aluminum (Al) includes both pure aluminum (pure Al) and an aluminum alloy (Al alloy).

Heat sinks are widely used for the purpose of lowering the temperature of heating elements such as CPUs and chipsets of personal computers, power transistors of AV amplifiers and audio equipment, and inverters of electric vehicles and hybrid vehicles (HV vehicles).

For example, Patent Document 1 discloses a technique in which a heat sink having a base plate and a large number of pin-shaped fins (pin fins) provided on one surface thereof is manufactured by die forging.

When such a heat sink is used as a water-cooled cooling device for a power module, for example, the outer peripheral edge of the base plate of the heat sink and the tips of a large number of pin fins are joined to a metal flow path member. The base plate of the heat sink and the flow path member form a cooling water flow path (cooling jacket) that surrounds the pin fins.

Conventionally, brazing is generally used to join the tip of a pin fin of a heat sink to a joining component such as a metal flow path member. For example, the brazing material is melted by forming the joining part with a molded product of a brazing sheet clad with a brazing material and heating the other part made of the brazing sheet in a state where the tip of the pin fin of the heat sink is pressed against the other part. A method of solidifying and joining the tip of a pin fin to a joining part is often adopted.

Japanese Unexamined Patent Publication No. 2010-192708

However, in the above-mentioned conventional heat sink, when a joining part is directly brazed to the tip of the pin fin, the joining part needs to be composed of a brazing sheet, so that it cannot be easily manufactured by, for example, a brazing sheet. It is difficult to use a machined product or the like as a joining part. As described above, in the conventional heat sink, since the joining parts to be brazed are limited to those made of brazing sheet, there is a problem that the degree of freedom in design is lowered and the product value may be lowered. ..

On the other hand, when a joining part made of a bare material having no brazing material is joined to the tip of a pin fin of a heat sink, a brazing material sheet, a brazing material paste, a brazing sheet, etc. By interposing a member for supplying a brazing material (hereinafter referred to as "brazing material sheet or the like"), the tip of the pin fin can be reliably brazed and joined to the joining part. However, in that case, the number of parts increases due to the addition of the brazing material sheet or the like, which causes a decrease in production efficiency and an increase in cost, which is another problem.

The present invention has been made in view of the above problems, and the fin tips can be reliably joined to joining parts other than those made of brazing sheets without using a brazing sheet or the like separately, and the design is free. It is an object of the present invention to provide a heat sink manufacturing method and related technology capable of increasing the degree of freedom, increasing the product value, and further improving the production efficiency and reducing the cost.

In order to achieve the above object, the present invention provides the following means.

[1] A method for manufacturing a heat sink for obtaining a heat sink in which a plurality of fins are integrally formed on one surface of a base plate.
Prepare a forged material having an aluminum core material and a one-sided brazing material layer laminated on one surface of the core material and composed of the brazing material.
Manufacture of a heat sink characterized in that the forged material is plastically deformed by a mold forging process to manufacture a heat sink in which a tip bonding layer made of the brazing material of the one-sided brazing material layer is formed at the tip of the fin. Method.

[2] The method for manufacturing a heat sink according to item 1 above, wherein the brazing material is not adhered to the peripheral side surface of the fin in the heat sink.

[3] The method for manufacturing a heat sink according to item 1 or 2 above, wherein the forged material is laminated on the other surface of the core material and includes an other surface brazing material layer composed of the brazing material.

[4] The method for manufacturing a heat sink according to item 3 above, wherein the other surface bonding layer made of the brazing material of the other surface brazing material layer is formed on the other surface of the heat sink.

[5] Brazing and joining aluminum joining parts to the pin fin tips of the heat sink obtained by the manufacturing method according to any one of 1 to 4 above, using the brazing material of the tip joining layer. A method of manufacturing a cooling device, which comprises manufacturing a cooling device by means of.

[6] An aluminum heat sink in which a plurality of fins are integrally formed on one surface of a base plate.
A tip bonding layer made of brazing material is formed at the tip of the fins, and a one-sided joining layer made of brazing material is formed between each of the plurality of fins on one surface of the base plate.
A heat sink characterized in that no brazing material is adhered to the peripheral side surface of the fin.

According to the method for manufacturing a heat sink according to the invention [1], a tip bonding layer made of a brazing material is formed at the tip of a fin. It can be directly brazed and joined. Therefore, the heat sink according to the present invention can be easily used as a member for joining other than the brazing sheet, and the degree of freedom in design is increased, so that the product value can be improved and the brazing sheet and the like can be omitted. Since the number of parts can be reduced, production efficiency can be improved and costs can be reduced.

According to the method for manufacturing a heat sink according to the invention [2], since the brazing material is not adhered to the peripheral side surface of the fin, the brazing material adhered to the peripheral side surface of the fin is melted and lost during brazing. Since it is possible to prevent the fin shape from changing, it is possible to maintain high dimensional accuracy of the fin portion and obtain good heat dissipation characteristics.

According to the method for manufacturing a heat sink according to the inventions [3] and [4], since the other surface bonding layer is also formed on the other surface side of the base plate, the brazing material of the other surface bonding layer is used to form the base plate. Joining parts can be brazed and joined to the other side as well.

According to the method for manufacturing a cooling device according to the invention [5], the cooling device is manufactured by using the heat sink according to the inventions [1] to [4]. Can be improved and costs can be reduced.

According to the heat sink according to the invention [6], since it has the same configuration as the heat sink manufactured by the manufacturing methods of the inventions [1] to [4], the product value is improved, the production efficiency is improved, and the cost is improved as described above. Can be reduced.

FIG. 1 is a schematic front sectional view showing a forging machine capable of carrying out the manufacturing method of the embodiment of the present invention in a punch-raised state. FIG. 2 is a schematic front sectional view showing the forging apparatus of the embodiment in a punch descent state. FIG. 3 is a perspective view showing the heat sink manufactured in the embodiment. FIG. 4 is an enlarged front sectional view showing a part of the heat sink of the embodiment. FIG. 5 is a front sectional view showing the forged material used in the embodiment. FIG. 6 is a schematic cross-sectional view showing an example of a cooling device manufactured by using the heat sink according to the present invention in an exploded state. FIG. 7 is a schematic cross-sectional view showing an example of the cooling device in an assembled state. FIG. 8 is a schematic cross-sectional view showing another example of the cooling device manufactured by using the heat sink according to the present invention in an exploded state. FIG. 9 is a front sectional view showing a heat sink manufactured by a modification of the present invention. FIG. 10 is a front sectional view showing a forged material used in manufacturing a heat sink of a modified example.

1 and 2 are front sectional views schematically showing an example of a forging machine used in the method for manufacturing a heat sink according to an embodiment of the present invention. In the present embodiment, the forging material 2 is subjected to mold forging using the forging equipment shown in FIGS. 1 and 2, and the heat sink 9 as a forged product is formed. The forged material 2 will be described later, but a material made of aluminum is preferably used.

FIG. 3 is a perspective view showing a heat sink 9 manufactured by the forging machine of the embodiment. As shown in the figure, the heat sink 9 includes a rectangular base plate 91 and a large number of pin fins 92 formed on the upper surface (one surface) of the base plate 91. Each pin fin 92 is formed in a columnar shape and is integrally formed with the base plate 91.

In this embodiment, the orientation of the heat sink 9 is determined by the posture of the heat sink 9 in the mold immediately after molding. Specifically, in the present embodiment, the surface of the heat sink 9 on the side where the pin fins 92 are formed is regarded as one surface, and the surface on the side where the pin fins 92 are not formed is described as the other surface. Further, in the forged material 2, the surface on which the pin fin 92 is to be formed is described as one surface, and the surface on the opposite side thereof is described as the other surface.

As shown in FIGS. 1 and 2, the forging apparatus used in the present embodiment includes a die 1 as a lower die, a punch 5 as an upper die, a punch holder 62 for holding the punch 5, and a back pressure. It is provided with a back pressure applying mechanism 7 for applying the back pressure as a basic component.

A molding recess 11 for molding the base plate 91 of the heat sink 9 is formed on the upper surface of the die 1.

A knockout pin (not shown) is housed in the bottom wall portion of the molding recess 11 in the die 1 so as to be able to project upward from the bottom surface of the molding recess 11. Then, as will be described in detail later, the heat sink 9 molded in the molding recess 11 of the die 1 is pushed up by the knockout pin, and the heat sink 9 is arranged so as to project upward from the molding recess 11 in a small amount.

The punch 5 is formed in a bottomed cylindrical shape with a closed lower end, and a punch body 51 corresponding to the molding recess 11 of the die 1 is formed on the bottom wall portion thereof.

The punch body 51 is formed with a large number of fin forming holes 52 for forming the pin fins 92 of the heat sink 9 as a forged product. Each fin forming hole 52 penetrates in the vertical direction, and the upper end is opened to the internal space of the punch 5 and the lower end is opened to the lower side of the punch. Further, the horizontal cross-sectional shape of each fin forming hole 52 is formed corresponding to the horizontal cross-sectional shape of the pin fin 92.

A punch plate 61 is arranged on the upper end surface of the punch 5 so as to close the upper end opening thereof. In that state, the punch 5 and the punch plate 61 are held by the punch holder 62.

Further, the punch holder 62 is supported up and down by a guide post (not shown) or the like, and the punch 5 is aligned with the axis of the molding recess 11 of the die 1 in a state where the punch 5 is aligned with the axis of the molding recess 11 of the die 1. It can be moved in and out (up and down).

Further, the punch holder 62 can be driven up and down by an up and down drive means (not shown). Then, when the punch 5 is arranged above the die 1 as shown in FIG. 1 and the punch 5 is lowered together with the punch holder 62 by the elevating drive means, the main body 51 of the punch 5 is die as shown in FIG. It is designed to be driven into the molding recess 11 of 1.

The punch 5 is provided with a back pressure applying mechanism 7. The back pressure applying mechanism 7 includes a spring holder 71 housed in the internal space of the punch 5.

The spring holder 71 is slidably supported in the internal space of the punch 5 along the vertical direction (axis center).

Further, the spring holder 71 is formed with a plurality of spring accommodating recesses 72 on the upper end surface side thereof, and each spring accommodating recess 72 accommodates a spring 73 as a urging means composed of a compression coil spring or the like. The upper end of each spring 73 is joined to the punch plate 61 in a compressed state, and the lower end is joined to the bottom surface of the spring accommodating recess 72. Therefore, in the state where the punch 5 is raised (normal state), the spring holder 71 is pushed downward by its own weight and the urging force of the spring 73, and is in contact with the bottom wall portion (punch body 51) of the punch 5. It is designed to be placed.

Further, the back pressure applying mechanism 7 is provided with a back pressure applying pin 75 corresponding to each fin forming hole 52 of the punch 5. The horizontal cross-sectional shape of each back pressure applying pin 75 is formed corresponding to the horizontal cross-sectional shape of each fin forming hole 52. The back pressure applying pin 75 is also referred to as an ejector pin.

Each back pressure applying pin 75 is slidably housed in the corresponding fin forming hole 52 along the axial direction (vertical direction) with its upper end fixed to the lower portion of the spring holder 71. There is. As a result, each back pressure applying pin 75 slides up and down in each fin forming hole 52 as the spring holder 71 moves up and down.

As shown in FIG. 1, the lower end surface (tip restraint surface) of each back pressure applying pin 75 is a fin forming hole in a state where the spring holder 71 is arranged at the lower end position (a state in which the punch 5 is raised). It is arranged so as to correspond to the lower end opening of 52, that is, the molding surface of the punch body 5.

Here, the forged material 2 used in the present embodiment will be described. As shown in FIG. 5, the forged material 2 of the present embodiment is a laminated body including a core material 21 and a brazing material layer (one-sided brazing material layer) 22 clad on one surface of the core material 21 and composed of a brazing material. It is composed of (brazing sheet).

As the core material 21, the main component thereof is preferably aluminum having high thermal conductivity, for example, 1000 series aluminum (pure aluminum type), aluminum having high durability, for example, 6000 series aluminum alloy (Al-Mg-Si type), or the like. Can be used. The core material 21 may be composed of a composite material of aluminum as its main component (base material) and carbon having better thermal conductivity. Further, the composite material is not limited to two layers, and may be composed of a multi-layer structure having three or more layers.

As the brazing filler metal layer 22, a commonly used brazing filler metal, for example, a 4000 series aluminum alloy (Al—Si series) represented by JIS-Z3263-2002 or the like can be preferably used.

Further, in the forged material 2, a reinforcing layer made of an alloy containing aluminum as a main component and having higher strength than the core material 21 may be formed on the other surface side of the core material 21. When the reinforcing layer is formed on the other surface side of the core material 21 in this way, when the heat sink 9 having a thin base plate 91 is manufactured by forging, the pin fin formation position on the other surface side of the base plate 91 is set. It is possible to effectively prevent the occurrence of sink marks.

As will be described later, in the forging material 2, a brazing material layer (other surface brazing material layer) in which the brazing material is clad may be formed on the other surface of the core material 21 as in the case of the one surface side.

Using the forging material 2 having the above configuration, forging is performed by the above forging apparatus shown in FIGS. 1 and 2 to form the heat sink 9.

That is, as shown in FIG. 1, a lubricant is applied to the required portions of the die 1 and the punch 5, and the plate-shaped forging material 2 is set in the molding recess 11 of the die 1. The forged material 2 is arranged so as to face the punch 5 (fin forming hole 52) with its one side (the brazing material layer 22 side) facing upward. The forging material 2, the die 1 and the punch 5 are preheated as necessary.

From this state, as shown in FIG. 2, the punch 5 is lowered and the punch body 51 is driven into the molding recess 11 of the die 1. As a result, a compressive load is applied to the forging material 2, and the metal material (metal) constituting the forging material 2 plastically flows due to the compressive load, and each back pressure applying pin 75 is subjected to its own weight of the back pressure applying mechanism 7. And while pushing upward against the urging force of the spring 73, it flows into each fin forming hole 52 of the punch body 51.

Here, the own weight of the back pressure applying mechanism 7 and the urging force of the spring 73 function as back pressure (resistance force) acting in the direction opposite to the inflow direction with respect to the metal material flowing into each fin forming hole 52. Therefore, the metal material can be flowed into each fin forming hole 52 in a well-balanced and even manner.

Then, the base plate 91 is formed by the metal material filled in the molding space surrounded by the inner peripheral surface of the molding recess 11 of the die 1 and the molding surface (lower end surface) of the punch body 51, and the back pressure applying pin 75 is formed. The pin fin 92 is formed by the metal material filled in the molding space surrounded by the tip restraint surface and the inner peripheral surface of the fin forming hole 52. As a result, as shown in FIG. 3, a heat sink 9 which is a forged product in which a large number of pin fins 92 are integrally formed on one surface of the base plate 91 is formed.

FIG. 5 is an enlarged front sectional view showing a part of the heat sink 9 manufactured by the manufacturing method of the present embodiment. As shown in the figure, the tip bonding layer 93 is integrally formed at the tip of the pin fin 92 by applying the brazing material by the brazing material layer 22 of the forging material 2. Further, a one-sided bonding layer 94 is formed by coating the brazing material by the brazing material layer 22 of the forging material 2 between the pin fins 92 on one surface of the base plate 91 (the portion where the pin fins 92 are not formed). Forging.

Further, the peripheral side surface 921 of the pin fin 92 of the heat sink 9 is arranged in a state where the brazing material formed by the brazing material layer 22 of the forged material 2 is not adhered and the metal constituting the core material 21 is exposed.

In the heat sink 9 of the present embodiment configured as described above, since the tip bonding layer 93 made of the brazing material is integrally formed at the tip of the pin fin 92, the brazing material of the tip bonding layer 93 is used. Metallic joining parts can be brazed and joined. Therefore, when joining a joining component such as a heat radiating member to the pin fin 92 of the heat sink 9 of the present embodiment, the joining component can be brazed and joined directly to the pin fin 92. Therefore, as the heat sink 9 of the present embodiment, parts other than those made of a brazing sheet can be used as the joining parts, the degree of freedom in design is increased, the versatility is improved, and the product value can be improved. Further, since the number of parts can be reduced because the brazing sheet and the like can be omitted, the production efficiency can be improved and the cost can be reduced.

Further, according to the heat sink 9 of the present embodiment, the brazing material is adhered only to the tip surface of each pin fin 92, and the brazing material is not adhered to the peripheral side surface 921 of the pin fin 92, so that high dimensional accuracy is maintained. It is possible to obtain good heat dissipation characteristics. That is, if the brazing material is adhered to the peripheral side surface 921 of the pin fin, the brazing material on the peripheral side surface of the pin fin is melted and lost due to heat at the time of brazing, so that the dimensions of the pin fin are changed and deformed. Resulting in. Then, the dimensional accuracy of the fin portion in the heat sink is lowered, and it becomes difficult to obtain good heat dissipation characteristics.

On the other hand, in the heat sink 9 of the present embodiment, since the brazing material is not adhered to the peripheral side surface 921 of the pin fin 92, it is possible to prevent the shape of the fin pin 92 from changing due to the melting and disappearance of the brazing material. Therefore, the heat sink 9 of the present embodiment can maintain high dimensional accuracy of the fin portion, and can surely maintain good heat dissipation characteristics.

Next, a case where a water-cooled cooling device for a power module is manufactured using the heat sink 9 according to the present embodiment will be described.

6 and 7 are front sectional views schematically showing an example of the water-cooled cooling device. As shown in the figure, this cooling device includes a heat sink 9 configured in the same manner as the heat sink of the above embodiment, an insulating substrate 31, a power module (heating element) 3, and a flow path member 8.

The insulating substrate 31 is laminated so that the ceramic plate 33 is interposed between the two metal conductive plates 32, 32, and the lower conductive plate 32 is joined and fixed to the other surface side of the heat sink 9 by brazing. At the same time, the power module 3 is attached to the upper conductive plate 32.

The flow path member 8 is composed of a molded product of a metal plate or the like, and the intermediate region is recessed on the lower surface side on the other surface side, so that the flow path recess 81 is formed on the upper surface side and the recess is formed. A flange 82 is formed on the outer peripheral edge of the 81. The tip of the pin fin 92 is brazed to the bottom surface of the flow path recess 81 of the flow path member 8 in a state where the pin fin 92 is accommodated in the flow path recess 81 of the flow path member 8. At the same time, the outer peripheral edge portion on one surface side of the base plate 91 is brazed to the flange 82 of the flow path member 81. As a result, the cooling water (refrigerant) flow path 85 surrounding the pin fin 92 is formed by the inner peripheral surface of the flow path recess 81 of the flow path member 8 and one surface of the base plate 91 of the heat sink 9.

In this cooling device, since the joining layers 93 and 94 are formed on the tip of the pin fin 92 in the heat sink 9 and one surface of the base plate 91, respectively, the brazing material of the joining layers 93 and 94 is used to form a flow path member. 8 can be brazed and joined. Therefore, as described above, as the flow path member (joining component) 8, a material other than that made of a brazing sheet can be easily used, the configuration of the flow path member 8 is not restricted, and the degree of freedom in design is increased. Therefore, the product value can be improved. For example, since a bare material can be used as the flow path member 8, the degree of freedom in design is further increased, and the product value can be further improved.

Further, in this cooling device, it is not necessary to separately use a brazing material sheet or the like for brazing and joining of the flow path member 8, and the number of parts can be reduced by that amount, and the production efficiency and the cost can be reduced. can.

Further, FIG. 8 is a front sectional view schematically showing another example of the water-cooled cooling device manufactured by using the heat sink 9 according to the present embodiment. As shown in the figure, in the heat sink 9 used in this cooling device, the region where the pin fins 92 are formed on one surface side of the base plate 91 is recessed on the other surface side, and the flow path recess 96 is formed. A flange 97 is formed on the outer peripheral edge of the flow path recess 96.

The power module 3 is attached to the other surface side of the base plate 91 in the heat sink 9 via the insulating substrate 31 in the same manner as described above.

Further, on one surface side of the heat sink 9, the tip of the pin fin 92 and the flange 97 are brazed to the flow path member 8 in a state where a flat plate-shaped flow path member 8 is arranged so as to close the flow path recess 96. To. As a result, the inner peripheral surface of the flow path recess 96 of the heat sink 9 and the flow path member 8 form a cooling water (refrigerant) flow path 85 that surrounds the pin fin 92.

In this cooling device as well, since the flow path member 8 can be brazed and joined by using the brazing material of the joining layers 93 and 94 in the heat sink 9, the product value is improved, the production efficiency is improved, and the cost is improved. It can be reduced.

FIG. 9 is a front sectional view schematically showing a heat sink 9 manufactured by a manufacturing method which is a modification of the present invention, and FIG. 10 is a front cross section showing a forged material 2 used when manufacturing the heat sink of the modification. It is a figure. As shown in both figures, when the heat sink 9 is manufactured, as the forging material 2, the one-sided brazing filler metal layer 22 is formed on one surface side of the core material 21 as described above, and the other surface brazing filler metal layer is also formed on the other surface side. 23 is formed, that is, the brazing filler metal layers 22 and 23 are formed on both sides of the core material 21, and the forging process is performed in the same manner as described above.

In the heat sink 9, the other surface bonding layer 95 formed by the other surface brazing material layer 23 is also formed on the other surface side of the base plate 91 on which the pin fins 92 are not formed. In the heat sink 9 of this modification, other configurations are the same as those of the heat sink 9 of the above embodiment.

The same effect as described above can be obtained with the heat sink 9 of this modified example. Furthermore, in this modification, since the other surface bonding layer 95 is formed on the other surface side of the base plate 91, when the cooling device as shown in FIG. 6 or the like is manufactured, the other surface of the base plate 91 is further formed. The insulating substrate 31 can be brazed and joined by using the brazing material of the surface bonding layer 95. Therefore, when joining the insulating substrate 31, it is not necessary to use a brazing sheet or the like for joining the brazing material, the degree of freedom in design is further increased, the product value can be further improved, the production efficiency is improved, and the cost is reduced. Further reductions can be achieved.

In the above embodiment, the case where the pin fin 92 is formed on one surface of the base plate 91 has been described as an example, but the present invention is not limited to this, and in the present invention, the pin fin is formed on at least one surface of the base plate. For example, pin fins may be formed on both one surface and the other surface of the base plate.

Further, in the above embodiment, the case where the heat sink is formed by so-called back pressure forging, in which back pressure is applied during forging, has been described as an example, but the present invention is not limited to this, and in the present invention, back pressure is not applied. It may be forged to form a heat sink.

Further, in the above embodiment, the case of manufacturing a heat sink on which pin fins are formed has been described as an example, but in the present invention, the shape of the fins formed on the heat sink is not particularly limited, and other than the pin fins. Fins such as plate fins may be formed.

Further, in the above embodiment, the case where the fin forming hole 52 is formed on the punch 5 side and the fin is formed by backward extrusion has been described as an example, but the present invention is not limited to this, and in the present invention, the die forming recess is formed. Fins may be formed by forming fin forming holes on the bottom surface and extruding forward to form fins.

Further, in the present invention, when the brazing material does not adhere to the peripheral side surface of the fin, it means that the brazing material does not substantially adhere to the peripheral side surface of the fin. For example, in the present invention, the peripheral side surface of the fin does not adhere. A small amount of brazing material may be attached to the vicinity of the root portion or the vicinity of the tip portion of the above.

The method for manufacturing a heat sink of the present invention can be used when manufacturing a heat sink in which fins are integrally formed on a base plate or the like.

21: Core material 22: One-sided brazing material layer 23: Other-sided brazing material layer 8: Flow path member (part for joining)
9: Heat sink 91: Base plate 92: Pin fin 921: Peripheral side surface 93: Tip bonding layer 94: One-sided bonding layer 95: Other-surface bonding layer

Claims (5)

It is a method of manufacturing a heat sink for obtaining a heat sink in which a plurality of fins are integrally formed on one surface of a base plate.
Prepare a forged material having an aluminum core material and a one-sided brazing material layer laminated on one surface of the core material and composed of the brazing material.
By plastically deforming the forged material by mold forging, a heat sink in which a tip bonding layer made of the brazing material of the one-sided brazing material layer is formed at the tip of the fin is manufactured .
A method for manufacturing a heat sink, characterized in that a brazing material is not adhered to the peripheral side surface of the fin in the heat sink. The method for manufacturing a heat sink according to claim 1 , wherein the forged material is laminated on the other surface of the core material and includes an other surface brazing material layer composed of the brazing material. The method for manufacturing a heat sink according to claim 2 , wherein the other surface bonding layer made of the brazing material of the other surface brazing material layer is formed on the other surface of the heat sink. Cooling by brazing and joining aluminum joining parts using the brazing material of the tip joining layer to the pin fin tips of the heat sink obtained by the manufacturing method according to any one of claims 1 to 3 . A method of manufacturing a cooling device, characterized in that the device is manufactured. An aluminum heat sink with multiple fins integrally formed on one surface of the base plate.
A tip bonding layer made of brazing material is formed at the tip of the fins, and a one-sided joining layer made of brazing material is formed between each of the plurality of fins on one surface of the base plate.
A heat sink characterized in that no brazing material is adhered to the peripheral side surface of the fin.

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