JPH0831701B2 - Heat sink and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink in which a fin and a base plate are formed integrally with each other, and a plurality of plate-shaped extruded shapes having a predetermined shape are superposed and joined to each other. The present invention relates to a heat sink and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a heat sink, there is, for example, one in which a plurality of grooves are formed on the surface of a base plate and the edges of each fin are joined to the grooves.
As the joining, for example, soldering is performed. However, the heat sink having the above-described structure has to be soldered for each fin, which is troublesome to manufacture. Further, it is difficult to perform strong joining, and there is a problem in durability.

[0003]

OBJECTS OF THE INVENTION It is an object of the present invention to provide a heat sink having a simple and strong structure, and a method capable of easily manufacturing the heat sink.

[0004]

The heat sink of the present invention is a heat sink in which a fin and a base plate are integrally formed, and a plate-shaped extruded shape member having a rib having a rib in the thickness direction is formed. A plurality of them are superposed at equal intervals through ribs and are joined to each other by solder or brazing material, and the solder or brazing material is closely packed in the gap formed by the adjacent extruded profile and ribs. It is filled, the base plate is composed of the joint portion of the extruded profile by the solder or brazing material and the solder or brazing material, and the fin is composed of the other part of the extruded profile. It has a feature.

A method of manufacturing a heat sink according to the present invention is a method of manufacturing a heat sink in which a fin and a base plate are formed as an integral member, and a plate-shaped extruded shape member having a rib having a rib in the thickness direction is formed. , Superimposing a plurality of ribs at equal intervals via ribs, and immersing the gap between the extruded profile and the ribs in this superposed body in molten solder or molten brazing material Is added so that the solder or the brazing material is densely filled in the gap to bond the extruded shape members to each other.

[0006]

In the heat sink of the present invention, since the fins and the base plate are formed as an integral member, the fins cannot be removed from the base plate, and the extruded shape members are closely filled in the gaps. Since it is joined in a wide area by solder or brazing material, it is strong and has excellent durability. In addition, since a plurality of extruded shape members each having a predetermined shape are superposed and joined to each other, and the fin and the base plate are integrated, the structure is simple.

In the method for manufacturing a heat sink of the present invention, a plurality of extruded shape members having a predetermined shape are superposed and immersed in molten solder or molten brazing filler metal to fill the gaps with the solder or brazing filler metal. It is very easy because it is simply joined to. Moreover, since the solder or the brazing material is filled in the gap by applying ultrasonic vibration, the solder or the brazing material can sufficiently enter every corner of the gap, and the extruded shape members can be joined to each other without any trouble.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Example 1 FIG. 1 is a side view showing a heat sink of this example. This heat sink 1 is composed of a base plate 2 and fins 3 formed as an integral member, and a plurality of aluminum extruded shape members 4 shown in FIG. Has been done. The solder 5 is a solder for aluminum member, for example, 95
% Zn-5% Al is used.

As shown in FIG. 2 and FIG. 3 which is a view taken in the direction of arrow III in FIG. 2, the extruded shape member 4 is a plate-like member and is composed of one thin plate, and is formed on one surface of the main body 41. Two ribs 4
2, 43 are formed. Ribs 42, 43
Protrude in the thickness direction of the main body 41 by the same height a ₁ as viewed from the portion that becomes the fin 3. The rib 43 is
The height b when viewed from the portion of the main body 41 that becomes the base plate 2
Only _{one is} protruding. Here, a ₁ and b ₁ are set to be equal. The heat sink 1 includes a plurality of extruded shape members 4
Are arranged in parallel with the ribs 42 and 43 in one direction,
The ribs 42 and 43 are brought into contact with the surface 41a of the adjacent extruded shape members 4 on the side where the ribs 42 and 43 are not present to be overlapped, and the solder 5 is placed in the gap 6 formed by the adjacent extruded shape members 4 and the ribs 43. By being filled, they are bonded to each other and configured.

The specific size of the heat sink 1 having the above structure may be, for example, as follows. That is, FIG.
, The length L is 45 mm and the height H ₁ of the fin 3 is 3
0 mm, the height H ₂ is 3mm of the base plate 2, the thickness T is 0.8mm of extruded profile 4, in FIG. 2, a ₁ i.e. fins 3 mutual spacing and b ₁ or spacing of the gap 6 are both 1m
m. If b ₁ is too narrow, the solder 5 cannot enter. On the contrary, if it is too wide, the solder 5 that has entered falls off. 0.5 to 1.5 mm is suitable as b ₁ .

Next, a method of manufacturing the heat sink 1 having the above structure will be described. First, the plurality of extruded shape members 4 are arranged in parallel with the ribs 42 and 43 in one direction, and the ribs 4 are
2, 43 are brought into contact with the surface 41a of the adjacent extruded shape member 4 on the side without the ribs 42, 43, that is, they are overlapped as shown in FIG. Next, the gap 6 of this superposed body 10 is
As shown in FIG. 7, the molten solder 5 in the bath 7 is dipped, and in that state, ultrasonic vibration is applied to the superposed body 10 or the bath 7. If the superposed body 10 is simply immersed, an oxide film is formed on the surface of the extruded shape member 4, so that the molten solder 5
The molten solder 5 is repelled and does not spread into the gap 6 due to the surface tension of the molten solder 5, and therefore, the molten solder 5 does not sufficiently penetrate into the gap 6 as shown in FIG. But,
Since ultrasonic vibration is applied, the oxide film is destroyed, which improves the wettability between the surface of the extruded shape member 4 and the molten solder 5, and the vibration of the molten solder 5 reduces the surface tension. Therefore, as shown in FIG.
Penetrates into every corner of the gap 6.

When the solder 5 is filled in the gap 6, the superposed body 10 is pulled out from the molten solder 5, and the portion 5a protruding from the gap 6 of the solder 5 as shown in FIG.
Are machined away. As a result, the heat sink 1 having the configuration shown in FIG. 1 is obtained.

In the above method, a plurality of extruded shape members 4 having a predetermined shape are superposed on each other, immersed in the molten solder 5 and the gap 5 is filled with the solder 5, so that they are joined to each other. It's easy. Moreover, in the above method,
Since the gap 5 is filled with the solder 5 by applying ultrasonic vibration, the solder 5 can sufficiently penetrate into every corner of the gap 6,
The extruded shape members 4 are joined to each other without any trouble.

In the heat sink 1 having the structure shown in FIG. 1 obtained by the above method, since the fins 3 and the base plate 2 are formed as an integral member, the fins 3 cannot be separated from the base plate 2. Moreover, since the extruded shape members 4 are joined to each other in a wide area by the solder or the brazing material densely filled in the gap, the extruded shape members 4 are strong and excellent in durability. Moreover, a plurality of extruded shape members 4 having a predetermined shape are simply overlapped and joined to each other, and the fin 3 and the base plate 2 are integrated, so that the structure is simple.

(Embodiment 2) FIG. 9 is a side view showing a heat sink of this embodiment, FIG. 10 is a side view showing an extruded shape member as a constituent member, and FIGS. 11 and 12 show one step of a manufacturing method. It is a figure. In these drawings, the same reference numerals as those used in FIGS. 1 to 8 showing the first embodiment indicate the same or corresponding ones.

The heat sink 1a of this embodiment is constructed by using an extruded profile 4a made of aluminum shown in FIG. The extruded profile 4a has a plate shape, but differs from the extruded profile 4 (FIG. 2) of the first embodiment in that two thin plates are integrally formed. That is, in FIG.
The extruded shape member 4a is formed by forming two ribs 42 and 43 on one surface 41b of a main body 41 composed of two thin plates 411 and 412. The main body 41 includes two thin plates 411,
412 has a shape integrated in parallel with each other via the ribs 42a and 43a. The rib 42 a is provided on the opposite side of the rib 42 and has the same size as the rib 42.
3a is provided on the opposite side of the rib 43 in a size having a height from the upper edge of the rib 43 to the lower end of the extruded shape member 4a. The protrusion heights a ₁ and b ₁ of the ribs 42 and 43 are the same as those in the first embodiment.

The heat sink 1a of this embodiment is also the same as that of the first embodiment.
Similarly, a plurality of extruded shape members 4a are arranged in parallel with the ribs 42 and 43 directed in one direction, and the ribs 42 and 43 are provided on the surface 41a of the adjacent extruded shape member 4a on the side without the ribs 42 and 43. Are abutted against each other and overlapped with each other, and the gaps 6 formed by the adjacent extruded shape members 4 a and the ribs 43 are filled with the solder 5 to be joined to each other.

The manufacturing method of the heat sink 1a of this embodiment is the same as that of the first embodiment. That is, first, a plurality of extruded shape members 4a are arranged in parallel so that the ribs 42 and 43 are oriented in one direction, and the ribs 42 and 43 are arranged on the ribs 4 of the adjacent extruded shape members 4a.
Abut on the surface 41a on the side without 2, 43, that is, as shown in FIG.
Stack as shown in. Next, this superposed body 1
The gap 6 of 0a is immersed in the molten solder 5 in the bath 7 as shown in FIG.
Alternatively, ultrasonic vibration is applied to bath 7. As a result, the molten solder 5 sufficiently penetrates into every corner of the gap 6. Then, the heat sink 1a shown in FIG. 9 is obtained by scraping off the portion (corresponding to 5a in FIG. 8) protruding from the gap 6 of the solder 5.

That is, the heat sink 1a of this embodiment is also manufactured in the same manner as in the first embodiment, and has the same operation and effect. That is, it is very easy to obtain and extruded profile 4 in the manufacturing process
The joining between a is performed without any trouble, and the joining is made strong by the solder 5, and the structure is simple.

(Another embodiment) (1) FIG. 13 shows an extruded shape member 4b in which a ₁ in FIG. 2 is larger than b ₁ and FIG. 14 shows a heat sink 1b formed by using the extruded shape member 4b. . The heat sink 1b is shown in FIG.
The space between the fins 3 is larger than that of the heat sink 1 shown in FIG. The heat sink 1b is manufactured similarly to the heat sink 1.

(2) A brazing material may be used instead of the solder.

(3) The ribs 42 do not necessarily have to be provided in the extruded shape members 4, 4a and 4b.

(4) As the extruded profile, one formed of three or more thin plates may be used.

[0024]

As described above, in the heat sink of the present invention, a plurality of plate-shaped extruded shape members 4 (or 4a, 4b) having the ribs 43 in the thickness direction are provided at equal intervals via the ribs 43. The solder 5 or the brazing material is laminated on each other and joined to each other by the solder 5 or the brazing material.
The space 6 formed by the extruded shape members 4 and the ribs 43 adjacent to each other is densely filled, the base plate 2 is constituted by the joint portion of the extruded shape members 4 by the solder 5 or the brazing material, and the fins 3 are Since it is composed of other parts of the extruded shape member 4, it is strong and has a simple structure.

Further, according to the method for manufacturing a heat sink of the present invention, a plurality of plate-shaped extruded shape members 4 (or 4a, 4b) having ribs 43 in the thickness direction are superposed at equal intervals via the ribs 43. This superposed body 10 (or 10
The portion of the gap 6 formed by the adjacent extruded shape member 4 and the rib 43 in a) is immersed in the molten solder 5 or the molten brazing filler metal, and ultrasonic vibration is applied to the solder 5 or the solder in the gap 6. Since the extruded shape members 4 are joined to each other by filling the material densely, the extruded shape members 4 can be joined to each other without any trouble. That is, workability is good.

[Brief description of drawings]

FIG. 1 is a side view showing a heat sink according to a first embodiment of the present invention.

FIG. 2 is a side view showing an extruded shape member which constitutes the heat sink of FIG.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a side view showing one process of manufacturing the heat sink of FIG.

5 is a partial cross-sectional side view showing a step that follows the step of FIG.

FIG. 6 is an enlarged partial view showing a state where ultrasonic vibration is not applied in the step of FIG.

FIG. 7 is an enlarged partial view showing one state in the process of FIG.

FIG. 8 is an enlarged partial view showing a state after the process of FIG. 5 is completed.

FIG. 9 is a side view showing a heat sink according to a second embodiment of the present invention.

10 is a side view showing an extruded shape member which constitutes the heat sink of FIG. 9. FIG.

FIG. 11 is a side view showing one process of manufacturing the heat sink of FIG. 9.

12 is a partial cross-sectional side view showing a step that follows the step of FIG.

FIG. 13 is a side view showing an extruded profile forming a heat sink according to another embodiment of the present invention.

14 is a side view showing a heat sink composed of the extruded shape member of FIG. 13. FIG.

[Explanation of symbols]

 1, 1a, 1b Heat sink 2 Fins 3 Base plate 4, 4a, 4b Extruded profile 5 Solder 42, 43 Rib

Claims (6)

[Claims] 1. A heat sink in which a fin and a base plate are formed integrally with each other, and a plurality of plate-shaped extruded shape members each having a rib in the thickness direction are superposed at equal intervals via the rib. And are joined to each other by solder or brazing material, the solder or brazing material is densely filled in the gap formed by the adjacent extruded shape member and rib, and the base plate is extruded shape. A heat sink characterized in that it is composed of a joint portion of the material with the solder or brazing material and the solder or brazing material, and the fin is composed of another portion of the extruded profile. 2. The heat sink according to claim 1, wherein the extruded shape member is composed of one thin plate. 3. The heat sink according to claim 1, wherein the extruded shape member is formed by arranging two or more thin plates side by side with a gap therebetween and integrally forming one piece. 4. A method for manufacturing a heat sink in which a fin and a base plate are formed as an integral member, wherein a plate-shaped extruded profile having a predetermined shape having ribs in the thickness direction is equally spaced via the rib. A plurality of them are superposed on each other, and the portion of the gap formed by the adjacent extruded shape members and ribs in the superposed body is immersed in the molten solder or the molten brazing material, and ultrasonic vibration is applied to the above-mentioned gap. A method for manufacturing a heat sink, characterized in that the extruded shape members are bonded to each other by densely filling the solder or brazing material. 5. The method of manufacturing a heat sink according to claim 4, wherein the extruded shape member is composed of one thin plate. 6. The method for manufacturing a heat sink according to claim 4, wherein the extruded shape member is formed by arranging two or more thin plates in parallel with each other with a gap therebetween and integrally forming the extruded shape members.