JP2019160852A - Manufacturing method of heat sink - Google Patents

Abstract

To provide a manufacturing method of a heat sink that can improve production efficiency and reduce costs.SOLUTION: There is provided a manufacturing method of obtaining a heat sink 9 in which a plurality of fins 92 are integrally formed on one surface of a base plate 91. A forging material 2 including an aluminum core 21 and a one-side brazing material layer 22 laminated on one surface of the core 21 and made of a brazing material is prepared. The forging material 2 is plastically deformed by die forging to manufacture a heat sink in which a tip joining layer 93 made of the brazing material of the one-side brazing material layer 22 is formed at the tip of the fin 92.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method of manufacturing a heat sink in which the heat sink is formed by die forging and related techniques. In the present invention, 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 including a base plate and a large number of pin-shaped fins (pin fins) provided on one surface thereof is manufactured by die forging.

  When using such a heat sink as a water-cooled cooling device for a power module, for example, joining the outer peripheral edge of the base plate of the heat sink and the tips of a large number of pin fins to a metal channel member, A cooling water channel (cooling jacket) is formed by the base plate of the heat sink and the channel member so as to surround the pin fins.

  Conventionally, brazing is generally used to join the pin fin tip of a heat sink to a joining part such as a metal channel member. For example, a joining part is composed of a brazing sheet molded product clad with a brazing material, and the brazing material is melted by heating in a state where the tip of the pin fin of the heat sink is pressed against another part of the brazing sheet. Many methods of solidifying and joining the tip of the pin fin to the joining component are employed.

JP 2010-192708 A

  However, in the above-described conventional heat sink, when a joining component is directly brazed to the tip of the pin fin, it is necessary to configure the joining component with a brazing sheet. For example, it cannot be easily produced with a brazing sheet. It is difficult to use a cut 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 the brazing sheet, there is a problem that the degree of freedom in design is reduced and the product value may be lowered. .

  On the other hand, when joining parts composed of a bare material having no brazing material are joined to the pin fin tips of the heat sink, a brazing material sheet, brazing material paste, brazing sheet, etc. between the pin fins of the heat sink and the joining parts If a brazing material supply member (hereinafter referred to as “brazing material sheet or the like”) is interposed, the tip of the pin fin can be securely brazed to the joining component. However, in that case, the number of parts increases by adding a brazing material sheet or the like, resulting in a decrease in production efficiency and another problem of increasing the cost.

  The present invention has been made in view of the above-mentioned problems, and it is possible to reliably join the tip of a fin to a joining component other than a brazing sheet without using a brazing material sheet or the like. It is an object of the present invention to provide a heat sink manufacturing method and related technology capable of increasing the product value and 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 heat sink manufacturing method for obtaining a heat sink in which a plurality of fins are integrally formed on one surface of a base plate,
Prepare a forging material comprising a core material made of aluminum and one side brazing material layer laminated on one side of the core material and composed of brazing material,
Manufacturing of a heat sink, wherein the forging material is plastically deformed by die forging to manufacture a heat sink in which a tip joining layer made of the brazing material of the one side brazing material layer is formed at the tip of the fin. Method.

  [2] The method for manufacturing a heat sink as recited in the aforementioned Item 1, wherein a brazing material is not attached to the peripheral side surface of the fin in the heat sink.

  [3] The method for manufacturing a heat sink as recited in the aforementioned Item 1 or 2, wherein the forged material is laminated on the other surface of the core material and includes a brazing material layer formed of a brazing material.

  [4] The method for manufacturing a heat sink according to [3], wherein an 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 an aluminum joining component to the pin fin tip of the heat sink obtained by the manufacturing method according to any one of items 1 to 4 using the brazing material of the tip joining layer. The manufacturing method of the cooling device characterized by manufacturing a cooling device by.

[6] An aluminum heat sink in which a plurality of fins are integrally formed on one surface of a base plate,
A tip joining layer composed of a brazing material is formed at the tip of the fin, and a one-surface joining layer composed of a brazing material is formed between each of the plurality of fins on one surface of the base plate,
A heat sink, wherein a brazing material is not attached to the peripheral side surface of the fin.

  According to the heat sink manufacturing method according to the invention [1], since the tip joining layer made of the brazing material is formed at the tip of the fin, the metal joining component is made using the brazing material of the tip joining layer. Can be brazed directly. Therefore, the heat sink according to the present invention can be used without difficulty as a joining member other than a brazing sheet, and since the degree of freedom in design increases, the product value can be improved and the brazing material sheet can be omitted. Since the number of parts can be reduced, the production efficiency can be improved and the cost can be reduced.

  According to the heat sink manufacturing method according to the invention [2], since the brazing material is not attached to the peripheral side surface of the fin, the brazing material attached to the peripheral side surface of the fin is melted and lost during brazing, Since it can prevent that a fin shape changes, the dimensional accuracy of a fin part can be maintained highly and a favorable heat dissipation characteristic can be acquired.

  According to the heat sink manufacturing method according to the invention [3] and [4], since the other surface bonding layer is formed also 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. The joining component can also be brazed to the other surface side.

  According to the manufacturing method of the cooling device according to the invention [5], the cooling device is manufactured using the heat sink according to the inventions [1] to [4]. Improvement and cost reduction can be achieved.

  The heat sink according to the invention [6] has the same configuration as the heat sink manufactured by the manufacturing method according to the inventions [1] to [4]. Therefore, the product value is improved, the production efficiency is improved, and the cost is the same as above. Can be reduced.

FIG. 1 is a schematic front cross-sectional view showing a forging apparatus capable of performing the manufacturing method according to the embodiment of the present invention in a punch raised state. FIG. 2 is a schematic front sectional view showing the forging device of the embodiment in a punch lowered state. FIG. 3 is a perspective view showing a 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 forging material used in the embodiment. FIG. 6 is a schematic cross-sectional view showing an example of a cooling device manufactured 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 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 according to a modification of the present invention. FIG. 10 is a front sectional view showing a forging material used when manufacturing a heat sink of a modification.

  FIG. 1 and FIG. 2 are front sectional views schematically showing an example of a forging device used in a 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 die forging using the forging device shown in FIGS. 1 and 2 to form the heat sink 9 as a forged product. The forging material 2 will be described later, but an aluminum material is preferably used.

  FIG. 3 is a perspective view showing the heat sink 9 manufactured by the forging device 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 formed integrally with the base plate 91.

  In the present 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 this embodiment, the surface on the side where the pin fins 92 of the heat sink 9 are formed is described as one surface, and the surface on the side where the pin fins 92 are not formed is described as the other surface. Furthermore, in the forging material 2, the surface on which the pin fins 92 are to be formed is described as one surface, and the opposite surface 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 mold, a punch 5 as an upper mold, a punch holder 62 that holds the punch 5, and a back pressure. Is provided as a basic component.

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

  A knockout pin (not shown) is accommodated in the bottom wall portion of the molding recess 11 in the die 1 so as to protrude upward from the bottom surface of the molding recess 11. 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 a small amount upward from the molding recess 11.

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

  A large number of fin forming holes 52 for forming the pin fins 92 of the heat sink 9 as a forged product are formed in the punch main body 51. Each fin forming hole 52 penetrates in the vertical direction, and an upper end is opened to the internal space of the punch 5 and a lower end is opened downward 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. In this state, the punch 5 and the punch plate 61 are held by the punch holder 62.

  The punch holder 62 is supported by a guide post or the like (not shown) so as to be movable up and down, and the punch 5 and the die 1 together with the punch holder 62 in a state where the axis of the punch 5 is aligned with the axis of the molding recess 11 of the die 1. Can be moved up and down.

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

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

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

  Further, the spring holder 71 is formed with a plurality of spring accommodating recesses 72 on the upper end surface side, and springs 73 serving as urging means including compression coil springs are accommodated in the respective spring accommodating recesses 72. Each spring 73 has a top end joined to the punch plate 61 in a compressed state and a bottom end joined to the bottom surface of the spring accommodating recess 72. Therefore, in a 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 brought into contact with the bottom wall portion (punch main body 51) of the punch 5. It is arranged.

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

  Each back pressure applying pin 75 is slidably accommodated along the axial direction (vertical direction) in the corresponding fin forming hole 52 with its upper end fixed to the lower side of the spring holder 71. Yes. Thus, 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.

  In addition, as shown in FIG. 1, the lower end surface (tip restraining surface) of each back pressure application pin 75 is a fin forming hole in a state where the spring holder 71 is disposed at the lower end position (a state where the punch 5 is raised). 52 is arranged corresponding to the lower end opening of 52, that is, the molding surface of the punch body 5.

  Here, the forging material 2 used in this embodiment will be described. As shown in FIG. 5, the forging material 2 of the present embodiment includes a core material 21 and a laminated body including a brazing material layer (one-sided brazing material layer) 22 that is clad on one surface of the core material 21 and configured by the brazing material. (Brazing sheet).

  As the core material 21, aluminum whose main component is high thermal conductivity, for example, 1000 series aluminum (pure aluminum series), or highly durable aluminum, for example, 6000 series aluminum alloy (Al—Mg—Si series) is preferably used. 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. Furthermore, the composite material is not limited to two layers, and may be configured by a multilayer structure of three or more layers.

  As the brazing material layer 22, a brazing material that is generally used, for example, a 4000 series aluminum alloy (Al—Si series) represented by JIS-Z3263-2002 can be suitably used.

  In the forged material 2, a reinforcing layer made of an alloy containing aluminum as a main component and higher in 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 manufacturing the heat sink 9 in which the thickness of the base plate 91 is thin by forging, the pin fin forming position on the other surface side of the base plate 91 is formed. 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 clad with a brazing material (other surface brazing material layer) 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, the heat sink 9 is formed by performing forging by the forging device shown in FIGS. 1 and 2.

  That is, as shown in FIG. 1, the lubricant is applied to the required portions of the die 1 and the punch 5, and the plate-like forging material 2 is set in the molding recess 11 of the die 1. The forging material 2 is arranged so that the one surface side (the brazing material layer 22 side) faces upward and faces the punch 5 (fin forming hole 52). 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 compression load is applied to the forging material 2, and the metal material (metal) constituting the forging material 2 is plastically flowed by the compression load, and each back pressure application pin 75 is moved by its own weight of the back pressure application mechanism 7. And while flowing upward against the urging force of the spring 73, it flows into the fin forming holes 52 of the punch body 51.

  Here, the self-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. Accordingly, the metal material can be uniformly and uniformly flowed into the fin forming holes 52.

  The base plate 91 is formed of a metal material filled in a 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 application pin 75. The pin fins 92 are formed of a metal material filled in a forming space surrounded by the front end restraining surface of the fin and the inner peripheral surface of the fin forming hole 52. Thereby, as shown in FIG. 3, the 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, a tip joining layer 93 is integrally formed at the tip of the pin fin 92 by applying a brazing material from the brazing material layer 22 of the forging material 2. Further, a single-surface bonding layer 94 is formed between the pin fins 92 on one surface of the base plate 91 (part where the pin fins 92 are not formed) by applying a brazing material by the brazing material layer 22 of the forging material 2. The

  Further, the brazing material due to the brazing material layer 22 of the forging material 2 is not attached to the peripheral side surface 921 of the pin fin 92 of the heat sink 9, 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 joining layer 93 made of the brazing material is integrally formed at the tip of the pin fin 92, the brazing material of the tip joining layer 93 is used, Metal joining parts can be brazed. For this reason, when joining parts, such as a heat radiating member, are joined to the pin fins 92 of the heat sink 9 of this embodiment, the joining parts can be brazed and joined directly to the pin fins 92. Accordingly, the heat sink 9 of the present embodiment can use other than the brazing sheet as a joining component, and the degree of design is increased and the versatility is improved, so that the product value can be improved. Furthermore, since the number of parts can be reduced by the amount that the brazing sheet or 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, since the brazing material is attached only to the front end surface of each pin fin 92 and the brazing material is not attached to the peripheral side surface 921 of the pin fin 92, high dimensional accuracy is maintained. And good heat dissipation characteristics can be obtained. That is, if the brazing filler metal is attached to the peripheral surface 921 of the pin fin, the brazing filler metal on the peripheral surface of the pin fin is melted and lost due to heat during brazing. Resulting in. If it does so, the dimensional accuracy of the fin part in a heat sink will fall, and it will become difficult to obtain a favorable heat dissipation characteristic.

  On the other hand, the heat sink 9 of this embodiment can prevent the shape of the fin pin 92 from being changed due to melting and disappearance of the brazing material because the brazing material is not attached to the peripheral side surface 921 of the pin fin 92. For this reason, the heat sink 9 of this embodiment can maintain the dimensional accuracy of a fin part highly, and can maintain a favorable heat dissipation characteristic reliably.

  Next, the case where the water cooling type cooling device for power modules is produced using the heat sink 9 by this embodiment is demonstrated.

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

  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 bonded and fixed to the other surface side of the heat sink 9 by brazing. In addition, the power module 3 is attached to the upper conductive plate 32.

  The flow path member 8 is formed of a molded product of a metal plate or the like, and the intermediate area is formed to be recessed on the lower surface side on the other surface side, whereby a flow path recess 81 is formed on the upper surface side, and the recess A flange 82 is formed on the outer peripheral edge of 81. The tip end of the pin fin 92 is brazed and joined to the bottom surface of the channel recess 81 of the channel member 8 in a state where the pin fin 92 is accommodated in the channel recess 81 of the channel member 8. At the same time, the outer peripheral edge of one surface of the base plate 91 is brazed to the flange 82 of the flow path member 81. Thus, a cooling water (refrigerant) flow path 85 surrounding the pin fins 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 front end of the pin fin 92 and one surface of the base plate 91 in the heat sink 9, the flow path member is formed using the brazing material of the joining layers 93 and 94. 8 can be brazed. Therefore, as already described, a material other than the brazing sheet can be used as the flow path member (joining part) 8 without difficulty, the configuration of the flow path member 8 is not restricted, and the degree of freedom in design increases. 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 the flow path member 8, and accordingly, the number of parts can be reduced, thereby improving production efficiency and reducing costs. it can.

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

  Further, on the one surface side of the heat sink 9, the tip end of the pin fin 92 and the flange 97 are brazed and joined to the flow path member 8 in a state where the flat flow path member 8 is disposed so as to close the flow path recess 96. The Thereby, the cooling water (refrigerant) flow path 85 surrounding the pin fins 92 is formed by the inner peripheral surface of the flow path recess 96 of the heat sink 9 and the flow path member 8.

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

  FIG. 9 is a front sectional view schematically showing the heat sink 9 manufactured by the manufacturing method which is a modification of the present invention, and FIG. 10 is a front sectional view showing the forging material 2 used in manufacturing the heat sink of the modification. FIG. When manufacturing this heat sink 9 as shown to both figures, as the forging material 2, the one surface brazing material layer 22 is formed in the one surface side of the core material 21 similarly to the above, and the other surface brazing material layer is also formed in the other surface side. Forging is performed in the same manner as described above, using a material in which brazing material layers 22 and 23 are formed on both surfaces of the core material 21.

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

  In the heat sink 9 of this modification, the same effect as described above can be obtained. Furthermore, in this modified example, 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. The insulating substrate 31 can be brazed and bonded using the brazing material of the surface bonding layer 95. For this reason, it is not necessary to use a brazing sheet or the like for joining the brazing material when joining the insulating substrate 31, the design flexibility is further increased, the product value can be further improved, the production efficiency is improved, and the cost is reduced. Further reduction can be achieved.

  In the embodiment and the like, the case where the pin fins 92 are formed on one surface of the base plate 91 has been described as an example. However, the present invention is not limited thereto, and in the present invention, the pin fins are formed on at least one surface of the base plate. For example, pin fins may be formed on both one side and the other side of the base plate.

  Further, in the above embodiment, the case where the heat sink is formed by so-called back pressure forging, which gives back pressure during forging, has been described as an example, but the present invention is not limited thereto, and in the present invention, no back pressure is applied. The heat sink may be formed by forging.

  In the above-described embodiment, the case where a heat sink having pin fins is manufactured has been described as an example. However, in the present invention, the shape of the fin formed on the heat sink is not particularly limited, and other than pin fins. Fins such as plate fins may be formed.

  Moreover, in the said embodiment, although the case where the fin shaping | molding hole 52 was formed in the punch 5 side and the fin was formed by back extrusion was mentioned as an example and demonstrated, it is not restricted only to it, In this invention, die shaping | molding recessed parts A fin forming hole may be formed on the bottom surface, and the fin may be formed by forward extrusion.

  In the present invention, when the brazing material is not adhered to the peripheral side surface of the fin, it means that the brazing material is not substantially adhered to the peripheral side surface of the fin. For example, in the present invention, the peripheral surface of the fin A small amount of brazing material may be adhered to the vicinity of the root portion, the vicinity of the tip portion, or the like.

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

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

Claims (6)

A heat sink manufacturing method for obtaining a heat sink in which a plurality of fins are integrally formed on one surface of a base plate,
Prepare a forging material comprising a core material made of aluminum and one side brazing material layer laminated on one side of the core material and composed of brazing material,
Manufacturing of a heat sink, wherein the forging material is plastically deformed by die forging to manufacture a heat sink in which a tip joining layer made of the brazing material of the one side brazing material layer is formed at the tip of the fin. Method.   The method of manufacturing a heat sink according to claim 1, wherein a brazing material is not attached to a peripheral side surface of the fin in the heat sink.   The method of manufacturing a heat sink according to claim 1 or 2, wherein the forging material includes a brazing material layer laminated on the other surface of the core material and configured by a brazing material.   The method of manufacturing a heat sink according to claim 3, wherein an other surface bonding layer made of a brazing material of the other surface brazing material layer is formed on the other surface of the heat sink.   Cooling by brazing and joining an aluminum joining component to a pin fin tip of a heat sink obtained by the manufacturing method according to claim 1, using a brazing material of the tip joining layer. A method of manufacturing a cooling device, characterized in that the device is manufactured. A heat sink made of aluminum in which a plurality of fins are integrally formed on one surface of a base plate,
A tip joining layer composed of a brazing material is formed at the tip of the fin, and a one-surface joining layer composed of a brazing material is formed between each of the plurality of fins on one surface of the base plate,
A heat sink, wherein a brazing material is not attached to the peripheral side surface of the fin.

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