JP3928099B2 - Heat sink and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat sink that is used in electronic devices such as servers and large computers and that radiates heat generated from electronic components that are components of the electronic device, and a method for manufacturing the same.
[0002]
In this specification, the direction indicated by the arrow A in FIG. 1 is referred to as the front, the opposite side is referred to as the rear, the direction indicated by the arrow B is also referred to as the left, and the opposite side is referred to as the right. In addition, the upper and lower sides of each drawing are referred to as the upper and lower sides. Further, in this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.
[0003]
[Prior art]
For example, servers and large computers used in a network composed of a plurality of personal computers are required to have multiple functions and high processing speeds, so that the output of the CPU increases and the amount of heat generated from the CPU also increases significantly. . In order to cool these CPUs, a heat sink with high heat dissipation performance is required even if the pressure loss when cooling air passes is sacrificed to some extent.
[0004]
Conventionally, as this type of heat sink, what is called a pin fin type has been used. An example of a pin fin heat sink is described in Japanese Patent Application Laid-Open No. 5-243435. In this heat sink, a through hole is formed in the heat dissipation board, and a pin fin is passed through the through hole from one side of the heat dissipation board, and a tip end portion of the pin fin protrudes from the other side of the heat dissipation board, and a base end portion of the pin fin A locking portion provided on the heat dissipation board is engaged with the one surface of the heat dissipation board, and a flat plate is joined to the one surface of the heat dissipation board to prevent the pin fins from falling off.
[0005]
Another example of the pin fin heat sink is described in Japanese Patent Laid-Open No. 6-281374. This heat sink includes a heat dissipation board and a heat exchanger unit bonded to the upper surface of the heat dissipation board, and the heat exchanger unit is composed of a strip plate that is bent in a serpentine shape with the width direction directed vertically. A pin fin is formed between adjacent through holes by spacing a plurality of elongated through holes extending in the width direction of the strip in the longitudinal direction of the strip.
[0006]
[Problems to be solved by the invention]
However, the heat sink described in Japanese Patent Application Laid-Open No. 5-243435 has a problem that it is troublesome to make a through hole in the heat dissipation board or pass a pin fin through the through hole. In addition, there is a problem that waste is generated when a through hole is made in the heat dissipation substrate, and the material cannot be used without waste.
[0007]
Moreover, in the heat sink described in JP-A-6-281374, there is a problem that waste is generated when the elongated through hole is formed, and the material cannot be used without waste.
[0008]
An object of the present invention is to provide a heat sink that solves the above-described problems, is easy to manufacture, and can use materials without waste during manufacture.
[0009]
[Means for Solving the Problems]
A heat sink according to a first aspect of the present invention includes a heat dissipating base having a heat dissipating fin mounting surface and a heat receiving surface, and a plurality of heat dissipating fins standing in a line in the front-rear direction on the heat dissipating fin mounting surface of the heat dissipating base and joined to the heat dissipating base. Ori, the radiation fin is provided with bets, and a forward projection bent portion and the rear projecting bent portions, corrugated band plate portion which thus provided alternately in the vertical direction via the vertical part, are arranged a plurality in the lateral direction Rutotomoni Formed by being integrally connected to each other in the vertical portion , and the front projecting bent portions and the rear projecting bent portions of the corrugated strip adjacent to each other in the left-right direction are shifted in the vertical direction, and adjacent in the front-rear direction. In the two radiating fins, the rear protruding bent portion of the front radiating fin and the forward protruding bent portion of the rear radiating fin are brought into contact with each other .
[0010]
The heat sink according to the invention of claim 2 is had contact to the invention of claim 1, the heat dissipating fins, in which are brazed to the heat radiation fin mounting surface of the heat radiating base.
[0011]
A heat sink according to a third aspect of the present invention is the heat sink according to the first or second aspect , wherein the heat dissipating base and the heat dissipating fin are each formed of a stretched material.
[0012]
In the invention of claim 3 , as the wrought material for forming the heat radiating base and the heat radiating fin, those made of aluminum or those made of copper (including a copper alloy) are used.
[0013]
According to a fourth aspect of the present invention, there is provided a heat sink manufacturing method comprising: a heat dissipating base having a heat dissipating fin mounting surface and a heat receiving surface; and a corrugated band plate portion in which front projecting bent portions and rear projecting bent portions are alternately provided in the vertical direction. another is formed by being integrally connected at a plurality lined Rutotomoni vertical portion in the lateral direction, and the forward projecting bent portion with each other and the rear protruding bent portions each other of the corrugated band plate portion adjacent to the lateral direction in the upper and lower directions Using the radiating fins that are displaced, placing the radiating fins on the radiating fin mounting surface of the radiating base, arranging a plurality of radiating fins in the front-rear direction, and the front radiating fins in the radiating fins adjacent in the front-rear direction and a step of abutting the forward projection bent portion of the heat radiating fins of the rear projecting bent portion and the rear side, arranged a plurality of heat radiation fins on the radiator base The heat radiating base and radiating fins in state stopped temporarily, and is characterized in that subsequently with the heat dissipation base and a heat radiation fin wax.
[0014]
In the invention of claim 4 , when arranging the radiation fins in the front-rear direction while placing them on the radiation fin mounting surface of the radiation base, and placing them on the radiation fin mounting surface of the radiation base after arranging the radiation fins in the front-rear direction. Includes cases.
[0015]
According to a fifth aspect of the present invention, there is provided a heat sink manufacturing method according to the fourth aspect of the invention, wherein the plate material is formed with a plurality of cuts extending in the vertical direction and having a predetermined length formed at intervals in the vertical direction. In addition to forming a plurality of rows at intervals in the left-right direction, the cuts of all the cut rows are arranged at the same position in the up-down direction, and among the three cuts arranged in the left-right direction at the same position in the up-down direction A forward protruding bent part is formed by bending the plate forward at the portion between the central cut and the left cut, and the plate is moved backward at the portion between the central cut and the right cut. The method includes a step of manufacturing a heat radiating fin by forming a rearward protruding bent portion by bending the bent portion.
[0016]
According to a sixth aspect of the present invention, there is provided a method of manufacturing a heat sink according to the fifth aspect of the invention, wherein the formation of the cut line and the formation of the front protruding bent portion and the rear protruding bent portion are simultaneously performed by pressing the plate material. is there.
[0017]
According to a seventh aspect of the present invention, there is provided a heat sink manufacturing method according to any one of the fourth to sixth aspects, wherein the heat dissipating base and the heat dissipating fin are each formed of a stretched material.
[0018]
A heat generating member according to an eighth aspect of the present invention includes the heat sink according to any one of the first to third aspects and an electronic component that generates heat, and the electronic component is disposed on a heat receiving surface of a heat dissipation base of the heat sink. It is in thermal contact.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0020]
FIG. 1 shows the overall structure of a heat sink according to the present invention, FIG. 2 shows a radiation fin, and FIG. 3 shows an enlarged part of the heat sink. 4 to 6 show a method for manufacturing a heat sink.
[0021]
In FIG. 1, a heat sink (1) has a heat radiation base (2) made of a square plate-like aluminum wrought material with an upper surface serving as a heat radiating fin mounting surface (2a) and a lower surface serving as a heat receiving surface (2b). A plurality of aluminum radiating material heat radiation fins (3) which are erected on the heat radiation fin mounting surface (2a) of the heat radiation base (2) in a longitudinal direction and brazed to the heat radiation base (2). Yes.
[0022]
As shown in FIG. 2, each radiating fin (3) has a front protruding bent portion (4a) and a rear protruding bent portion (4b) provided alternately in the vertical direction via a vertical portion (4c). A plurality of corrugated strips (4) are formed by being arranged in the left-right direction and integrally connected to each other in the vertical part (4c). In each radiating fin (3), the front projecting bent part (4a) and the rear projecting bent part (4b) of the corrugated strip (4) adjacent in the left-right direction are formed so as to be shifted in the vertical direction. Yes.
[0023]
As shown in FIG. 3, in two radiating fins (3) adjacent to each other in the front-rear direction, the rear protruding bent portions (4b) of the front radiating fin (3) and the front protrusions of the rear radiating fin (3) The bent portion (4a) is at the same position in the vertical direction and is in contact with each other. Therefore, in each radiating fin (3), a ventilation gap (5) is formed by the front protruding bent portion (4a) and the rear protruding bent portion (4b) located at the same position in the vertical direction, and two adjacent radiating fins are also formed. In (3), two rear projecting bent parts (4b) adjacent to the upper and lower sides of the front radiating fin (3) and the vertical part (4c) between the two rear projecting bent parts (4b) and the same position in the vertical direction. A ventilation gap (6) is formed by two front protruding bent portions (4a) adjacent to the upper and lower sides of the rear heat dissipating fin (3) and a vertical portion (4c) between the front protruding bent portions (4a). Yes.
[0024]
The manufacturing method of the heat sink (1) is as follows.
[0025]
First, a plate made of an aluminum wrought material is cut into a predetermined size to manufacture a heat radiating base (2), and a heat radiating fin (3) is manufactured as follows. That is, as shown in FIG. 4, a plurality of rows of cut lines (11) extending in the vertical direction are formed on a plate (10) of a predetermined size formed from an aluminum wrought material with a space in the left-right direction. Each cut line (11) is formed by a plurality of cut lines (11A) extending in the vertical direction and having a predetermined length and spaced in the vertical direction. Further, the cuts (11A) of all the cut lines (11) are at the same position in the vertical direction. Next, of the three cuts (11A) arranged in the left-right direction at the same position in the vertical direction, the plate (10) is moved forward in the portion between the cut (11A) at the center and the cut (11A) on the right side. By bending, a forward projecting bent part (4a) is formed (see the chain line in FIG. 4), and the plate (10) is moved backward at the portion between the central cut (11A) and the left cut (11A). By bending, a rear protruding bent portion (4b) is formed (see the chain line in FIG. 4). And between the adjacent cut rows (11), the front protruding bent portion (4a) and the rear protruding bent portion (4b) are alternately formed in the vertical direction, and the front protruding bent portion (4a) adjacent in the vertical direction and A portion between the rear protruding bent portion (4b) is defined as a vertical portion (4c). The formation of the cut row (11) and the formation of the front protruding bent portion (4a) and the rear protruding bent portion (4b) are simultaneously performed by pressing the plate material (10). Thus, there are a plurality of corrugated strips (4) in the left-right direction in which the front protruding bent part (4a) and the rear protruding bent part (4b) are alternately provided in the vertical direction via the vertical part (4c). The heat dissipating fins (3) shown in FIG. 2 formed by being lined up and connected together are manufactured. As for the corrugated strips (4) at the left and right ends, the left and right edges of the plate (10) act as cuts to form the front protruding bent part (4a) and the rear protruding bent part (4b). do.
[0026]
After manufacturing the heat radiating base (2) and the heat radiating fins (3), a plurality of heat radiating fins (3) are arranged in the front-rear direction as shown in FIG. At this time, in the radiating fin (3) adjacent in the front-rear direction, the rear protruding bent part (4b) of the front radiating fin (3) and the front of the rear radiating fin (3) in the same position in the vertical direction The protruding bent portion (4a) is brought into contact with the protruding bent portion (4a). Next, a plurality of heat dissipating fins (3) are placed on the heat dissipating fin mounting surface (2a) of the heat dissipating base (2) via an aluminum brazing sheet (13) or an aluminum brazing sheet with clad brazing material layers on both sides. Place the combined combination.
[0027]
Next, as shown in FIG. 6, the heat dissipating base (2) and the heat dissipating fin (3) are temporarily pressed with the upper and lower jigs (14), (15) and the binding tool (16) pressed from above and below. Stop. The upper jig (14) is composed of a rectangular horizontal plate-shaped main body (14a) and lower projecting walls (14b) integrally formed on both front and rear side edges of the main body (14a), The upper ends of all the radiating fins (3) abut on the lower surface of the main body (14a), and the combination of the radiating fins (3) is restrained from both the front and rear sides by the front and rear lower projecting walls (14b). The lower jig (15) has a horizontal plate shape and is arranged so as to be in surface contact with the heat receiving surface (2b) of the heat radiating base (2). Then, the upper and lower jigs (14) and (15) are bound by the binding tool (16) to temporarily fix the heat radiating base (2) and the heat radiating fins (3) in a state where they are pressed from above and below.
[0028]
Subsequently, these are heated to a predetermined temperature, and the lower end portion of the radiation fin (3) is brazed to the radiation base (2) using the aluminum brazing sheet (13) or the aluminum brazing material sheet. Thus, the heat sink (1) is manufactured.
[0029]
When manufacturing the heat sink (1), instead of arranging a plurality of heat radiation fins (3) in the front-rear direction, place the heat radiation fin (3) on the heat radiation fin mounting surface (2a) of the heat radiation base (2). However, you may arrange in the front-back direction.
[0030]
Further, the heat sink (1) according to the present invention is a heat generating member having a heat generating electronic component that needs to be cooled, and the electronic component is thermally applied to the heat receiving surface (2b) of the heat dissipation base (2) of the heat sink (1). Used in contact. Examples of the heat generating member include a large computer and a server.
[0031]
In the above embodiment, the vertical portion (4c) is located between the front protruding bent portion (4a) and the rear protruding bent portion (4b) adjacent to each other in the vertical direction in each corrugated strip (4) of the radiating fin (3). ) And the wavy strips (4) adjacent in the left-right direction are integrally connected to each other at the vertical part (4c), but the vertical part (4c) is not necessarily required. In this case, the portions of the adjacent corrugated strip portions (4) where the front projecting bent portion (4a) switches to the rear projecting bent portion (4b) intersect with each other, and are thus integrally connected to each other.
[0032]
【The invention's effect】
According to the first aspect of the present invention, since the plurality of radiating fins are erected side by side in the front-rear direction and joined to the radiating base on the radiating fin mounting surface of the radiating base, the above-mentioned JP-A-5-243435. It can be manufactured more easily than the heat sink described in the publication. Mutual Further, the heat radiating fin, and the forward projection bent portion and the rear projecting bent portions, corrugated band plate portion formed by alternately provided in the vertical direction via the vertical part, in Rutotomoni vertical portion arranged plurality in the lateral direction Since the front projecting bent portions and the rear projecting bent portions of the corrugated strip adjacent to each other in the left-right direction are displaced in the vertical direction, the plate material made of the wrought material is formed. A plurality of cut lines extending in the vertical direction and having a predetermined length are formed at intervals in the vertical direction, and a plurality of lines are formed at intervals in the horizontal direction, and left and right at the same position in the vertical direction Of the three cuts lined up in the direction, at the part between the cut in the center and the cut on the left side, a forward protruding bent part is formed by bending the plate material forward, and the cut in the central part and the right In part between the cut of, by forming a rearward projection bent portion by bending a plate material to the rear, it is possible to manufacture the heat radiating fins. Therefore, no waste is generated during the production of the heat radiating fins, and the material can be used without waste. In addition, the front projecting bent portion and the rear projecting bent portion have the same function as the pin fins in the above-described two conventional heat sinks, that is, the function of preventing an increase in the boundary film, and the heat radiation area is the same as that of the above two conventional heat sinks. Since it becomes significantly larger than that, the heat dissipation performance is improved. Furthermore, the width of the radiation fin is determined according to the width of the radiation fin mounting surface of the radiation base, but the height of the radiation fin can be maximized considering the installation space of the heat sink. It is possible to maximize the heat transfer area within a limited range.
[0033]
According to the heat sink of the first aspect of the present invention, in the two radiating fins adjacent to each other in the front-rear direction, the rear protruding bent portion of the front radiating fin and the forward protruding bent portion of the rear radiating fin are brought into contact with each other. Therefore, the positioning of the radiation fins on the radiation fin mounting surface of the radiation base can be easily performed. Moreover, the size of the ventilation gap can be easily adjusted by changing the protruding height of these bent portions.
[0034]
According to the heat sink of the second and third aspects of the present invention, the heat transfer of the heat dissipation base and the heat dissipation fin is excellent, and as a result, heat from the heat-generating component brought into contact with the heat receiving surface of the heat dissipation base is smoothly dissipated. Radiated from the radiating fin. Therefore, the heat dissipation performance of the heat sink is improved.
[0035]
According to the heat sink manufacturing method of the fourth aspect , the heat sink of the first aspect can be easily manufactured.
[0036]
According to the heat sink manufacturing method of the fifth aspect of the present invention, no waste is generated in manufacturing the heat radiation fin, and the material can be used without waste. And according to this manufacturing method, the magnitude | size of the radiation fin obtained can be determined freely by changing the magnitude | size of the board | plate material used as a raw material.
[0037]
According to the heat sink manufacturing method of the sixth aspect of the present invention, the radiating fin can be easily manufactured.
[0038]
According to the heat sink manufacturing method of the seventh aspect of the present invention, a heat sink having the effect of the third aspect of the invention can be manufactured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a heat sink according to the present invention.
FIG. 2 is a partially cutaway perspective view showing a heat radiation fin used in a heat sink.
FIG. 3 is an enlarged partial side view showing a part of a heat sink.
FIG. 4 is a partial perspective view showing a method of manufacturing a heat radiating fin.
FIG. 5 is a perspective view showing a method for setting a heat dissipation base and a heat dissipation fin.
FIG. 6 is a side view showing a state in which a heat radiating base and a heat radiating fin are temporarily fixed.
[Explanation of symbols]
(1): Heat sink
(2): Heat dissipation base
(2a): Radiation fin mounting surface
(2b): Heat receiving surface
(3): Radiating fin
(4): Wavy strip
(4a): Bending part protruding forward
(4b): Backward protruding bent part
(10): Plate material
(11): Cut line
(11A): Cut

Claims (8)

  A heat radiation base having a heat radiation fin mounting surface and a heat receiving surface, and a plurality of heat radiation fins erected side by side in the front-rear direction on the heat radiation fin mounting surface of the heat radiation base and joined to the heat radiation base, A plurality of wavy strips in which the front projecting bent portion and the rear projecting bent portion are alternately provided in the vertical direction via the vertical portion are arranged in the left-right direction and are integrally connected to each other in the vertical portion. The front projecting bent portions and the rear projecting bent portions of the wavy strips adjacent to each other in the left-right direction are displaced in the vertical direction, and the two heat dissipating fins adjacent to each other in the front-rear direction have heat radiation on the front side. A heat sink in which a rearward projecting bent portion of the fin and a front projecting bent portion of the rear heat dissipating fin are brought into contact with each other.   The heat sink according to claim 1, wherein the radiating fin is brazed to a radiating fin mounting surface of the radiating base.   The heat sink according to claim 1 or 2, wherein the heat dissipating base and the heat dissipating fin are each formed of a wrought material.   A plurality of undulating strip portions in which a heat dissipating base having a heat dissipating fin mounting surface and a heat receiving surface and front projecting bent portions and rear projecting bent portions are alternately provided in the vertical direction via vertical portions are arranged in the left and right direction. And radiating fins that are formed by being integrally connected to each other in the vertical portion and in which the front projecting bent portions and the rear projecting bent portions of the wavy strips adjacent in the left-right direction are displaced in the vertical direction, respectively. Use the process of placing the radiation fins on the radiation fin mounting surface of the radiation base, arranging the plurality of radiation fins in the front-rear direction, and the rear protruding bent part and rear side of the front-side radiation fin in the radiation fins adjacent in the front-rear direction A step of abutting the bent forward portion of the heat dissipating fin with a plurality of heat dissipating fins disposed on the heat dissipating base. The temporarily fixed, then the heat dissipation base and radiating fins and a method for manufacturing a heat sink, characterized in that the brazing.   On the plate material, a plurality of cut lines extending in the vertical direction and having a predetermined length are formed at intervals in the vertical direction. Keep the cut at the same position in the vertical direction, and place the plate material forward in the portion between the central cut and the left cut out of the three cuts arranged in the horizontal direction at the same position in the vertical direction. Produces forward radiating bent portions by bending, and manufactures radiating fins by forming backward protruding bent portions by bending the plate material backward at the same portion between the central cut and the right cut. The method of manufacturing a heat sink according to claim 4, comprising a step of:   6. The method of manufacturing a heat sink according to claim 5, wherein the formation of the cut line and the formation of the front protruding bent portion and the rear protruding bent portion are simultaneously performed by pressing the plate material. The method of manufacturing a heat sink according to any one of claims 4 to 6, wherein the heat radiating base and the heat radiating fin are each formed of a wrought material. A heat generating member comprising the heat sink according to any one of claims 1 to 3 and an electronic component that generates heat, wherein the electronic component is in thermal contact with a heat receiving surface of a heat dissipation base of the heat sink. .

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