JPH08186201A - Heat sink assembly and heat sink - Google Patents

Abstract

PURPOSE: To improve heat conduction by increasing adhesion between a base board and a fin board material by fitting the fin board material and the base material tearing off an oxidized surface of each projecting stripe of the both each other and by assembling the newly produced surface after torn off to be joined each other by galling. CONSTITUTION: A plurality of projecting stripe parts 1a, 2a are formed are arranged at a specified interval in a combination part of a plurality of fin board materials 2 and a base board 1. The projecting stripe parts 1a, 2a of the fin board material 2 and the base board 1 are fit so that an oxidized surface of each of the projecting stripe parts 1a, 2a of the fin board material 2 and the base board 1 is torn off mutually and newly produced surface after torn off are assembled to be joined by galling mutually. Thereby, adhesion of a junction surface of the base board 1 and the fin board material 2 is increased and heat conduction is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink assembly method and a heat sink.

[0002]

2. Description of the Related Art A conventional forced-air cooling type heat sink for a heat generating element such as a power transistor has a theoretical limitation that the cooling efficiency is affected by the total area of the fins due to the limitation of the extrusion technology. Since the space and the thickness of the fin itself are limited by the technology, it is difficult to manufacture a heat sink which is lightweight and has a high cooling efficiency, which depends only on the extrusion technology.

In order to make up for this drawback, it was possible to increase the fin spacing and its total area by incorporating the brazing technology with the extrusion technology, but the brazing technology requires a large capital investment because it uses a furnace. I had to do it.
In addition, even if it looks as if the brazing was joined in appearance,
Voids were formed on the joint surface, and the joint was not sufficient.In order to compensate for this, it is attempted to join the extruded base material and fins by caulking, but the base and fin Unlike the cut material, it is difficult for the extruded material to have precise dimensions as shown in the drawing, so it is subject to production restrictions.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat sink assembling method and a heat sink which solve the above-mentioned conventional drawbacks.

[0005]

A heat sink assembling method according to the present invention is a heat sink assembling method in which a base plate and a plurality of fin plate members are fitted on the base plate. A plurality of ridges arranged at a predetermined interval from each other are formed in the joint portion, and when the ridges of the fin plate member and the base plate are fitted, each of the ridge parts of the fin plate member and the base plate is formed. It is assembled so that the oxidized surfaces are peeled off from each other, and the new surfaces after being peeled off are assembled so as to be in a state of being joined to each other by galling.

The heat sink according to the present invention is a heat sink assembled by fitting a base plate and a plurality of fin plate members on the base plate, and the fin plate member and the base plate are connected to each other at a predetermined interval. A plurality of arranged ridges are formed, and the cross-sectional shapes of the ridges of the fin plate material and the base plate are peeled off from each other at the time of fitting, and the new surfaces after being peeled off are separated from each other. The shapes are such that they are joined together by scraping.

Further, in the heat sink according to the present invention, the protrusion of the fin plate member comprises a first positioning portion and a first caulking portion, and the protrusion of the base plate has a second positioning portion and a second positioning portion. When the fin plate member and the base plate are fitted to each other, the first positioning portion and the second crimping portion, and the second positioning portion and the first crimping portion have an oxidized surface. The new surfaces after being stripped from each other become the joints that are in a state of being joined by gazing.

Further, in the heat sink according to the present invention, the first caulking portion of the ridge portion of the fin plate member has a predetermined angle with respect to the vertical direction, and the second caulking portion of the ridge portion of the base plate is formed. The portion has an angle with respect to the vertical direction that corresponds to the first crimped portion.

Further, in the heat sink according to the present invention, both the first positioning portion of the ridge portion of the fin plate member and the second positioning portion of the ridge portion of the base plate are wedge-shaped in the vertical direction. There is something.

[0010]

The fin plate member and the base plate are formed with a plurality of protrusions arranged at a predetermined distance from each other at the joint portion of the fin plate member and the base plate, and the fin plate member and the base plate are fitted together when the fin plate member and the base plate are fitted to each other. The oxidized surfaces of the ridges of the plate are stripped from each other, and the new surfaces after stripping are made to be in a state of being joined to each other by galling, so the adhesion between both is increased and the thermal conductivity is improved. .

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a heat sink to which the present invention is applied, FIG. 2 is a partial view showing a joined state of a fin plate member and a base plate, FIG. 3 is a front view of the fin plate member, and FIG.
FIG. 5 is an enlarged view of the fitting portion of the fin plate material and the base plate, and FIG. 5 is a detailed view of the fitting portion of the fin plate material and the base plate. In the figure, 1 is a surface 11 to which a heating element (not shown) is attached.
A base plate 2 having a heating element mounting surface 1 of the base plate 1
1 is a fin plate member having a surface attached to the surface 12 facing 1 and cooling the heat of the heat generating element by contact with wind or the like. The base plate 1 and the fin plate member 2 are made of a material having high heat conductivity, for example, a cutting member made of aluminum. As shown in FIG. 3, the fin plate member 2 has a radiating fin 2a for attaching to the base plate 1 at one end, and side plates 2b1 and 2b2 are divided into three small chambers to form a heat radiating fin. In order to obtain the predetermined heat radiation characteristics of the above, a plurality of them are connected and attached to the base plate 1.

The ridge 2a at the end of each fin plate 2 has a positioning portion 2 having a predetermined width w1 (for example, 1.6 mm).
The positioning portion 2a1 has a wedge shape with a taper in the vertical direction (for example, tip width w2 = 1.2 mm), and the caulking portion 2a2 is inclined by a slight angle θ with respect to the vertical direction. Is formed. The interval d between the respective ridge portions 2a is the same as or slightly larger than the width w1.

On the other hand, the mounting surface 1b of the base plate 1 is provided with a ridge 1a corresponding to the ridge 2a of the fin plate member 2. The protrusion 1a has a predetermined width w1 (for example, 1.
6 mm) having a positioning portion 1a1 and a caulking portion 1a2, the positioning portion 2a1 has a vertically tapered wedge shape (for example, tip width w2 = 1.2 mm), and the caulking portion 2a2 corresponds to the caulking portion 2a2. Then, it is formed with a slight angle θ with respect to the vertical direction. The spacing d between the respective ridges 1a is the same as or slightly larger than the width w1.

The positioning portion 1a1 of the base plate 1 and the positioning portion 2a1 of the fin plate material 2 reliably convert the force from above the fin plate material 2 or from the surface of the base 1 into the fastening of the fin plate material and the base plate. Plays a role of maintaining the squareness when the is fitted to the base plate 1.

The distance d between the ridges 1a and 2a is equal to or slightly larger than the width w1 of the ridges 1a and 2a due to the dimension intersection as described above, and the positioning portion 1
Since a1 and 2a1 are wedge-shaped, the fin plate material 2
By fitting a large pressing force from above the fin plate member 1 when fitting the fin plate member 1 to the base plate 1,
The contact surface between a and the ridge 1a of the base plate 1 is due to a frictional force, that is, the tip of the positioning portions 1a1 and 2a1 has a predetermined angle with respect to the vertical direction. Therefore, the oxidized surfaces are stripped off from each other to form a new surface, and the positioning portion 1a
1 and the crimped portion 2a2, and the positioning portion 2a1 and the crimped portion 1a2 form a joined state by galling. At this time, since the both joints have a wedge shape, the pressure in the vertical direction causes stress in the horizontal direction of the contact surface, so that the fastening can be more reliable.

The wedge portion of the positioning portion 1a1 of the fin plate member 2 is caulked portion 2a2 of the base plate 1 when it is inserted.
With the angle θ of, the portion is forcibly bent in the vertical direction, so that the fastening between the base plate 1 and the fin plate member 2 is made more reliable. The heat generated from the heating element is
The fin plate material 2 is sent to the fin plate material 2 through the joint surface between the fin plate material 2 and the base plate 1, and the fin plate material 2 is blown by a fan (not shown) attached to the heat sink.
Performs the function of depriving the heat transmitted from it.

There is no problem if the fin plate material 2 and the base plate 1 are joined by scraping as described above. However, when the fin plate material 2 and the base plate 1 are extruded materials, they are different from the cutting materials when extruded. Due to distortions, the fin plate member 2 and the base plate 1 may not be stably configured. In this case, the forcibly bent portions (that is, the positioning portions 1a1 and 2a1) at the tips of the joint portions of the fin plate material 2 and the base plate 1 generate a springback force that tries to return to the original state, and are different from the fin plate material fixed portions. Since a stress is generated, this becomes a fixing force of the fin plate member 2 to the base plate 1 (bonding force between the fin plate member 2 and the base plate 1 = thermal conductivity). That is, this portion plays a role of covering the variation of the heat sink performance due to the variation of the dimensions of the product. Further, even when the oxidized surface is thick and it is not possible to shift to a sufficient shaving state, the stress on the joint surface caused by the applied pressure can improve the heat conduction.

[0018]

According to the method of assembling the heat sink of the present invention, it is possible to use a general-purpose hydraulic press and a simple jig together without the need for brazing equipment or an expensive dedicated machine for crimping. , Easy to manufacture.

Further, according to the heat sink of the present invention, the joining surfaces of the base plate and the fin plate member are strongly rubbed against each other at the time of fitting, and the oxidized surfaces are peeled off so that the newly formed surfaces are joined to each other due to galling. , Its thermal conductivity can be increased.

In consideration of the extrusion technique and the heat treatment process, when the oxidized surface is too thick to form a new surface sufficiently,
Further, even when the extrusion accuracy is changed to some extent, the fin plate material and the base plate can be more securely fastened to each other.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a heat sink to which the present invention is applied.

FIG. 2 is a partial view showing a combined state of a fin plate member and a base plate.

FIG. 3 is a front view of a fin plate member.

FIG. 4 is an enlarged view of a fin plate member and a ridge portion of a base plate.

FIG. 5 (A) is a detailed view of a ridge portion of a fin plate material, (B).
Is a detailed view of the ridge of the base plate.

[Explanation of symbols]

 1 Base Plate 1a Ridge 1a1 Positioning 1a2 Caulking 2 Fin Plate 2a Ridge 2a1 Positioning 2a2 Caulking

[Procedure amendment]

[Submission date] February 10, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a heat sink to which the present invention is applied, FIG. 2 is a partial view showing a joined state of a fin plate member and a base plate, FIG. 3 is a front view of the fin plate member, and FIG.
FIG. 5 is an enlarged view of the fitting portion of the fin plate material and the base plate, and FIG. 5 is a detailed view of the fitting portion of the fin plate material and the base plate. In the figure, 1 is a surface 11 to which a heating element (not shown) is attached.
A base plate 2 having a heating element mounting surface 1 of the base plate 1
1 is a fin plate member having a surface attached to the surface 12 facing 1 and cooling the heat of the heat generating element by contact with wind or the like. The base plate 1 and the fin plate member 2 are made of a material having high heat conductivity, for example, an aluminum material. As shown in FIG. 3, the fin plate member 2 has a radiating fin 2a for attaching to the base plate 1 at one end, and side plates 2b1 and 2b2 are divided into three small chambers to form a heat radiating fin. In order to obtain the prescribed heat radiation characteristics of the base plate 1
Are connected to each other and attached. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 7, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (5)

[Claims] 1. A method for assembling a heat sink, comprising a base plate and a plurality of fin plate members fitted on the base plate, wherein a plurality of fin plates and the base plate are connected to each other at a predetermined distance from each other. Of the fin plate material and the base plate, when fitted to each other, the fin plate material and the base plate are fitted so that the oxidized surfaces of the respective ridge portions are peeled off from each other, A method for assembling a heat sink, characterized in that the new surfaces after being stripped are assembled so that they are in a state of being joined together by galling. 2. A heat sink assembled by fitting a base plate and a plurality of fin plate members on the base plate, and a plurality of ridges arranged at predetermined intervals in a joint portion of the fin plate member and the base plate. The fins and the base plate have a cross-sectional shape such that the oxidized surfaces are peeled off from each other at the time of fitting, and the new surfaces after being peeled off are in a joined state due to galling. A heat sink characterized by having the following shape. 3. The heat sink according to claim 2, wherein
The ridge portion of the fin plate member includes a first positioning portion and a first caulking portion, and the ridge portion of the base plate includes a second positioning portion and a second caulking portion. When the base plate is fitted, the first positioning portion and the second crimping portion, and the second positioning portion and the first crimping portion,
A heat sink in which the oxidized surfaces are stripped from each other, and the new surfaces after the stripping are joined to each other to form a joined state due to scoring. 4. The heat sink according to claim 3, wherein
The first caulking portion of the ridge portion of the fin plate member has a predetermined angle with respect to the vertical direction, and the second ridge portion of the ridge portion of the base plate has a predetermined angle.
The heat sink having an angle corresponding to the first swage portion with respect to the vertical direction. 5. The heat sink according to claim 4, wherein
A heat sink in which both the first positioning portion of the ridge portion of the fin plate material and the second positioning portion of the ridge portion of the base plate are wedge-shaped in the vertical direction.