JPH09102686A - Manufacture of pin fin type heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for producing a pin fin type heat sink, which comprises pin fins and a base plate in one united member, simply and reliably at a low production cost regardless of small size or large size. SOLUTION: A plurality of extruded sections 4 having ribs 42 are overlapped at equal intervals, gap portions formed by the adjoining extruded sections 4 and the ribs 42 are dipped in melted solder 5, and above mentioned gaps are densely filled up with solder 5 by applying ultrasonic vibration thereby mutually bonding the extruded sections and forming a jointed body 29 comprising the base plate 2 and fin portions 30. The fin portion 30 of the jointed body 20 is cut from its tip edge at equal intervals in a direction orthogonal to a width direction W of the extruded sections 4 with a cutter 100 thereby making a structure made of a number of pin fins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pin fin type heat sink in which a pin fin and a base plate are integrally formed.

[0002]

2. Description of the Related Art A pin fin type heat sink in which a base plate 2 and a pin fin 3 are integrally formed as shown in FIG. 17 is conventionally manufactured by forging or cutting.

However, in the case of manufacturing by forging, there is a drawback that the production cost becomes high. That is,
For example, the diameter is 100mm and the pin fin length is 10mm.
Heatsinks, although commonly manufactured using molds, were very expensive. Further, in the case of manufacturing a heat sink in which the length of the pin fin exceeds 10 mm, the life of the die used is drastically shortened, resulting in poor productivity. Further, in the case of manufacturing a heat sink having a diameter of more than 100 mm, the cost required for the mold and peripheral tools was extremely high.

On the other hand, in order to prevent the production cost from increasing, it has been attempted to manufacture a small heat sink and then join it by welding or the like to increase the size, but this is a high-grade welding without distortion. , Even in this case, the cost was significantly high.

In the case of manufacturing by cutting, since it is carved out from a complete aluminum block, there is a large amount of dead, it is uneconomical, and especially when the cutting pitch is dense, chips are produced. Was difficult to discharge, and problems such as clogging occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a pin fin type heat sink in which a pin fin and a base plate are integrally formed with each other at low production cost regardless of whether they are small or large. And

[0007]

In order to achieve the above object, the present invention is a method for manufacturing a pin fin type heat sink in which a pin fin and a base plate are integrally formed, and a predetermined rib having a thickness direction is provided. A plurality of plate-shaped extruded shape members are superposed at equal intervals via ribs, and the portion of the gap formed by the adjacent extruded shape members and ribs in this superposed body is melted or soldered in a molten solder. The solder or brazing material is soaked in the gap that the solder or the brazing material is densely filled in the gap by joining the extruded shape with each other, and the extruded shape is joined with the solder or the brazing material. A base plate composed of the solder or brazing material and a fin part composed of the other part of the extruded shape is formed, and the fin part of the joint is From the edge, by cutting every regular intervals in the direction perpendicular to the width direction of the extruded profile, it is characterized in that it has a structure containing a plurality of pin fins.

[0008]

1 is a perspective partial view of a pin fin type heat sink obtained by the manufacturing method of the present invention, FIG.
1 is a complete view taken along the line II in FIG. 1, FIG. 3 is a complete view taken along the line III in FIG.
FIG. 4 is a complete view taken along the line IV in FIG. The pin fin type heat sink 1 has a base plate 2 and a large number of pin fins 3 integrated with each other, and has an aluminum extruded shape member 4 shown in FIG. 5 as a constituent member. Reference numeral 5 is a solder for aluminum members, and for example, 95% Zn-5% Al is used.

As shown in FIG. 5, the extruded shape member 4 is in the form of a plate, is composed of one thin plate, and is formed on one surface of the lower portion of the main body 41 by a predetermined height. Rib 42
Are formed.

Next, a method of manufacturing the heat sink 1 will be described. First, a plurality of extruded shape members 4 are arranged in parallel so that the ribs 42 are oriented in one direction, and the ribs 42 are brought into contact with the surface 41a of the adjacent extruded shape members 4 on the side not having the ribs 42, that is, in FIG. As shown in FIG. If necessary, the superposed body 10 is supported by using an appropriate jig. FIG. 7 is a partial perspective view of the superposed body 10.

Next, the gap 6 of the superposed body 10 is
As shown in FIG. 8, it is immersed in the molten solder 5 in the bath 7, and in that state, ultrasonic vibration is applied to the superposed body 10 or the bath 7. Just immersing the superposed body 10
The molten solder 5 is repelled due to the oxide film formed on the surface of the extruded shape member 4, and the molten solder 5 does not reach the gap 6 due to the surface tension of the molten solder 5. Therefore, as shown in FIG. The solder 5 does not sufficiently enter the gap 6.
However, since the 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 molten solder 5 vibrates, so that the surface tension is increased. It becomes weak, and therefore, as shown in FIG. 10, the molten solder 5 sufficiently penetrates into every corner of the gap 6.

When the solder 5 is filled in the gap 6, the superposed body 10 is pulled up from the molten solder 5, and the portion 5 protruding from the gap 6 of the solder 5 as shown in FIG.
A is machined away. As a result, the joined body 20 shown in FIG. 12 is obtained. The bonded body 20 includes a base plate 2 and a fin portion 30 on which the pin fins 3 are formed.

Then, the fin portion 30 of the joined body 20 is extruded from the tip edge of the fin portion 30 by using a cutter 100 as shown in FIG. Cutting is performed in a direction perpendicular to the width direction W of the material 4. The cutting is performed up to the position of the upper surface of the rib 42, as shown in FIG. The cutter 100 is configured by arranging a plurality of rotary blades 101 having the same thickness side by side at equal intervals D and integrating them. As a result, the fin portion 30 is divided into a large number of pin fins 3, and the pin fin type heat sink 1 as shown in FIG. 1 is obtained. The width of the pin fin 3 is the cutter 100.
Is equal to the distance D.

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 to fill the gap 6 with the solder 5 so as to bond them to each other, and then cut by the cutter 100. Therefore, it is very easy and reliable and highly productive. Moreover, since it is not necessary to use an expensive mold, the cost can be reduced. Therefore, according to the above method, the heat sink 1 can be obtained at a low production cost.

Further, in the above method, the solder 5 in the gap 6 is
Since the filling is carried out by applying ultrasonic vibration, the solder 5 sufficiently penetrates into every corner of the gap 6, and the extruded shape members 4 are joined to each other without any trouble.

The heat sink 1 shown in FIG. 1 obtained by the above method is strong because the extruded shape members 4 are joined to each other by the solder 5 which has sufficiently penetrated into every corner of the gap 6. Become. Moreover, a plurality of extruded shape members 4 having a predetermined shape are simply overlapped and joined to each other, and the pin fin 3 and the base plate 2 are integrated, so that the structure is simple.

As the extruded shape member 4, a rib 42 having a groove 42a formed on the tip surface thereof as shown in FIG. 16 may be used. According to this, as shown in FIG.
When the solder 5 is introduced into the gap 6, the solder 5 can be introduced into the gap 6 while discharging the air in the gap 6 to the gap 61 side through the groove 42a. I can fully infiltrate every corner,
Joined body 20 joined with solder 5 with sufficient joining strength
Can be obtained.

A brazing material may be used instead of the solder.

[0019]

As described above, according to the method of manufacturing a pin fin type heat sink of the present invention, a plurality of plate-shaped extruded shapes 4 having a predetermined shape having ribs 42 in the thickness direction are equally spaced through the ribs 42. The portions of the gap 6 formed by the extruded shape members 4 and the ribs 42 adjacent to each other in the overlapped body 10 are immersed in the molten solder 5 or the molten brazing material, and ultrasonic vibration is applied to form the gap. 6 to solder 5
Alternatively, the extruded shape members 4 are densely filled with each other and the extruded shape members 4 are joined to each other, and the fin portion 30 of the joined body 20 is cut by the cutter 100, which is very simple and reliable, and can be performed with high productivity. Moreover, since it is not necessary to use an expensive mold, the cost can be reduced. Therefore, according to the above method, the heat sink 1 can be obtained at a low production cost. Further, the extruded shape members 4 can be joined to each other without any trouble.

[Brief description of the drawings]

FIG. 1 is a perspective partial view showing a pin fin type heat sink obtained by a manufacturing method of the present invention.

FIG. 2 is a complete view taken along the line II in FIG.

FIG. 3 is a full view taken along the arrow III in FIG.

FIG. 4 is a complete view taken along the line IV of FIG.

5 is a perspective view showing an extruded shape member which is a constituent member of the heat sink of FIG. 1. FIG.

FIG. 6 is a side view showing one process of manufacturing the heat sink of FIG. 1, showing a superposed body.

7 is a perspective partial view of the superposed body of FIG.

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

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

FIG. 10 is an enlarged partial view showing one state in the process of FIG.

FIG. 11 is an enlarged partial view showing a state after the process of FIG. 8 is completed.

FIG. 12 is a side view showing a joined body obtained through the process of FIG.

FIG. 13 is a partial perspective view showing the start of the step of cutting the bonded body.

14 is a complete view taken along the arrow XIV in FIG.

FIG. 15 is a perspective partial view showing the middle of the step of cutting the bonded body.

FIG. 16 is a perspective partial view showing a joined body made of an extruded profile of another example.

FIG. 17 is an overall perspective view of a conventional pin fin type heat sink.

[Explanation of symbols]

 1 pin fin type heat sink 2 base plate 3 pin fin 4 extruded profile 5 solder 42 rib

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 9, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

However, in the case of manufacturing a large variety of small lots by forging, there is a drawback that the production cost becomes high due to the high die cost.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Deleted

Claims (1)

[Claims] 1. A method for manufacturing a pin fin type heat sink in which a pin fin and a base plate are integrally formed, wherein a plate-shaped extruded shape member having a rib in a thickness direction is formed,
Plural pieces are superposed at equal intervals via ribs, and the portion of the gap formed by the adjacent extruded shape members and ribs in this superposed body is immersed in molten solder or molten brazing material, and ultrasonic vibration is applied. By adding the solder or brazing material densely to the gap by joining and joining the extruded shape members to each other, the joint portion of the extruded shape member by the solder or brazing material and the solder or brazing material A joined body is formed from the base plate and the fin portion composed of the other part of the extruded shape, and the fin portion of this joined body is formed in a direction perpendicular to the width direction of the extruded shape from its tip edge. A method for manufacturing a pin fin type heat sink, characterized by having a structure composed of a large number of pin fins by cutting at equal intervals.