JP2733748B2 - Heat sink assembly method and heat sink - 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 assembling method and a heat sink.

[0002]

2. Description of the Related Art A conventional forced air-cooled heat sink for a heating element such as a power transistor has a problem in that the cooling efficiency is theoretically affected by the total area of the fins due to the limitation of the extrusion technique, but the fins on the base plate are not affected. Since the spacing and the thickness of the fins themselves are limited by the technology, it has been difficult for a heat sink relying solely on the extrusion technology to produce a product that is lightweight and has high cooling efficiency.

[0003] In order to make up for this drawback, the fin spacing and the total area thereof can be increased by combining the brazing technique with the extrusion technique, but the brazing technique requires a large-scale capital investment due to the use of a furnace. I had to.
Also, even if the brazing looks as if it were joined on the appearance,
Voids are formed on the joining surface, and the joining was not sufficient.To compensate for this, joining of the extruded base material and fins by caulking has been attempted, but the base and fins have been tried. The extruded material is difficult to have precise dimensions as shown in the drawing, unlike the cut material, and thus 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 disadvantages.

According to a method of assembling a heat sink according to the present invention, in a method of assembling a heat sink in which a base plate and a plurality of fin plate members are fitted on the base plate, a predetermined portion is fixed to a joint portion between the fin plate member and the base plate. Concave ridges corresponding to a plurality of spaced ridges
The width of the part is the same as or close to the ridge
Characterized in that the fin plate material and the base plate material
When each ridge is fitted, each fin plate and base plate
Fits with pressure so that part of the oxidized surface of the strip is peeled off
Bonding strength between new surfaces after they have been stripped off
Due to the combined force of the
Ri Some assembled such that the joining state.

In a method for assembling a heat sink which is assembled by fitting a base plate and a plurality of fin plate members on the base plate, a plurality of protrusions arranged at a predetermined distance from each other at a joint portion of the fin plate material and the base plate. Corresponds to the strip
The width of the concave ridge is the same as or approximately equal to the width of the ridge.
The fin plate and the base are similar in size.
The fin plate and the base are
Pressure so that a part of the oxidized surface of each ridge of the plate is peeled off
Due to galling between new surfaces after they are mated and stripped
Combination of joint force and joint surface stress of each protruding part generated at the time of mating
It is shaped so as to be joined by force .

Further, in the heat sink according to the present invention, the protruding portion of the fin plate is formed of a first positioning portion and a first caulking portion, and the protruding portion of the base plate is connected to the second positioning portion. consists of a second caulking portion, during the fitting of the fin plate and the base plate, the caulking portion of the first positioning portion and brother 2, and the first caulking portion and the positioning portion of the brother 2, it
Fit with pressure so that each oxidized surface is peeled off, and peel off
The joining force and the mating of new surfaces after they are
The joining state is formed by a combined force with the joining surface stress of each protruding portion generated .

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

In the heat sink according to the present invention, both the first positioning portion of the ridge of the fin plate and the second positioning portion of the ridge of the base plate are wedge-shaped in the vertical direction. Is what it is.

[0010]

The fin plate and the base plate are formed with a plurality of projecting portions arranged at a predetermined distance from each other at a joint portion, and the fin plate and the base plate are fitted when the fin plate and the base plate are fitted. The oxidized surface of each protruding part of the plate is peeled off from each other, and the new surfaces after being peeled off are welded together.
Due to the combined force of the
Since in such a manner that the joint-like state Ri, both adhesiveness thermal conductivity improves increases.

[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 and a base plate, FIG. 3 is a front view of the fin plate, FIG.
5 is an enlarged view of a fin plate jig and a fitting portion of the base plate, and FIG. 5 is a detailed view of the fin plate material, the base plate, and a fitting portion of the base plate. In the drawing, reference numeral 1 denotes a base plate having a surface 11 on which a heating element (not shown) is mounted, and 2 denotes a base plate which is mounted on a surface 12 of the base plate 1 which faces the heating element mounting surface 11, and which generates heat by contact with wind or the like. It is a fin plate having a surface to be cooled. The base plate 1 and the fin plate 2 are made of a material having high heat conductivity, for example, an extruded aluminum material.
ing. As shown in FIG. 3, the fin plate member 2 has a protruding portion 2a at one end for attaching to the base plate 1, and constitutes a radiation fin in which the side plates 2b1 and 2b2 are partitioned into three small chambers. In order to obtain a predetermined heat dissipation property, a plurality of the components are connected to and attached to the base plate 1.

The protruding portion 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, a 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. Each protrusion 2
the distance d between a'm I Do not substantially the same as the width w1.

On the other hand, a protrusion 1a corresponding to the protrusion 2a of the fin plate 2 is formed on the mounting surface 1b of the base plate 1. The protrusion 1a has a predetermined width w1 (for example, 1.w).
The positioning portion 2a1 has a wedge shape with a taper in the vertical direction (for example, a tip width w2 = 1.2 mm), and the positioning portion 2a1 has a wedge shape in the vertical direction corresponding to the caulking portion 2a2. It is formed to be tilted by a slight angle θ with respect to it. Interval d of the projecting portion 1a is congestion
w1 walk pot has been the same.

The locating portion 1a1 of the base plate 1 and the locating portion 2a1 of the fin plate 2 are used to securely convert the force from above the fin plate 2 or from the surface of the base 1 into fastening of the fin plate and the base plate. Plays a role in maintaining the perpendicularity when fitting to the base plate 1.

The distance d between the projections 1a and 2a is approximately equal to the width w1 of each projection 1a and 2a due to dimensional tolerances as described above.
Crucible are made the same, and the positioning portion 1a1 and 2a
When the fin plate 2 is fitted to the base plate 1, a large pressing force is applied from above the fin plate 2 to fit the projection 2 a of the fin plate 2 and the base plate 1.
The protruding portion 1a and the contact surface are frictional forces, that is, the tips of the positioning portions 1a1 and 2a1 are in contact with the side surfaces of the caulking portions 2a2 and 1a2 having predetermined angles in the vertical direction. The positioning portion 1a1 and the caulking portion 1a2, and the positioning portion 2a1 and the caulking portion 1a2 form a bonding state with each other. At this time, since the two joining surfaces are wedge-shaped, stress is generated in the contact surface in the horizontal direction by the pressure in the vertical direction, so that the fastening can be more reliably performed.

Further, the wedge portion of the positioning portion 1a1 of the fin plate 2 is inserted into the caulking portion 2a2 of the base plate 1 at the time of insertion.
Is forcibly bent in the vertical direction at this portion, so that the fastening between the base plate 1 and the fin plate member 2 is further ensured. The heat generated from the heating element is
The fin plate 2 is sent to the fin plate 2 via the joint surface between the fin plate 2 and the base plate 1, and the fin plate 2 is blown by a fan (not shown) attached to a heat sink.
It works to deprive the heat transmitted from.

There is no problem if the fin plate member 2 and the base plate 1 are joined by the galling as described above. However, when the fin plate member 2 and the base plate 1 are extruded members, the cutting material is different from the extruded member. Of the fin plate 2 and the base plate 1 may not be stably formed. In this case, the fin plate 2
And the stress generated at the joint portion between the base plate 1 and the fin plate 2
(Fixing force between the fin plate member 2 and the base plate 1 = thermal conductivity). In other words, this portion plays a role in covering variations in heat sink performance due to variations in dimensions of the product. Further, even when the oxidized surface is too thick to shift to a state of sufficient galling, the stress on the joint surface caused by the applied pressure can improve the thermal conductivity.

[0018]

According to the method of assembling a heat sink according to the present invention, equipment for brazing and an expensive dedicated machine for caulking are not required, and a general-purpose hydraulic press or the like is used in combination with a simple jig. , Easy to manufacture.

Further, according to the heat sink of the present invention, the joining surfaces of the base plate and the fin plate material are strongly rubbed with each other at the time of fitting, and the oxidized surfaces thereof are peeled off so that the new surfaces are joined to each other by galling. , Its thermal conductivity can be increased.

In consideration of the extrusion technique and the heat treatment step, if the oxidized surface is too thick to form a new surface,
Even in various situations such as when the extrusion accuracy slightly changes, the fastening between the fin plate member and the base plate can be further ensured.

[Brief description of 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 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. 5A is a detailed view of a ridge portion of a fin plate material, and FIG.
Is a detailed view of a ridge of the base plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 1a Protrusion part 1a1 Positioning part 1a2 Crimp part 2 Fin plate material 2a Protrusion part 2a1 Positioning part 2a2 Crimp part

Claims (5)

(57) [Claims] 1. A base plate assembly and method of the heat sink assembled fitted a plurality of fins sheet thereon, a plurality which are arranged at a predetermined distance from each other in the coupling portion of the fin plate and the base plate For ridges
The width of the concave ridge is the same as or approximately equal to the width of the ridge.
The fin plate and the base are similar in size.
The fin plate and the base are
Pressure so that a part of the oxidized surface of each ridge of the plate is peeled off
Due to galling between new surfaces after they are mated and stripped
The joint force and the stress generated at the joint surface of each protruding part at the time of mating
A method of assembling a heat sink, wherein the heat sink is assembled so as to be joined by a combined force of the heat sink. 2. A method of assembling a heat sink, wherein a base plate and a plurality of fin plate members are fitted thereon to assemble the fin plate member and the fin plate member. For multiple ridges
The width of the concave ridge is the same as or approximately equal to the width of the ridge.
The fin plate and the base are similar in size.
The fin plate and the base are
Pressure so that a part of the oxidized surface of each ridge of the plate is peeled off
Due to galling between new surfaces after they are mated and stripped
The joint force and the stress generated at the joint surface of each protruding part at the time of mating
Characterized in that the heat sink is assembled so as to be joined by a combined force of the heat sink. 3. The heat sink according to claim 2, wherein the protruding portion of the fin plate comprises a first positioning portion and a first caulking portion, and the protruding portion of the base plate comprises a second positioning portion. consists of a caulking portion of the brother 2, during the fitting of the fin plate and the base plate, the caulking portion of the first positioning portion and brother 2, and the positioning portion and the first caulking portion brother 2, its
Fit with pressure so that the oxidized surface is peeled off, and peel off
Attachment force and mating between new surfaces after they are removed due to galling
Due to the combined force with the stress generated on the joint surface of each protrusion
A heat sink, wherein the heat sink is assembled so as to be joined . 4. The heat sink according to claim 3, wherein
The first caulking portion of the ridge of the fin plate has a predetermined angle with respect to the vertical direction, and the second caulking portion of the ridge of the base plate has a predetermined angle.
Wherein the swaged portion has an angle with respect to the vertical direction corresponding to the first swaged portion. 5. The heat sink according to claim 4, wherein
A heat sink, wherein a first positioning portion of the ridge portion of the fin plate material and a second positioning portion of the ridge portion of the base plate are both vertically wedge-shaped.