JP3080919B2 - Radiator and method of forming 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 radiator provided near an electronic component or the like for efficiently radiating heat generated from the electronic component or the like. The present invention relates to a radiator provided with fins.

[0002]

2. Description of the Related Art Electronic components such as integrated circuit elements such as CPUs and power transistors sometimes generate heat by themselves when operated. If this heat is not sufficiently dissipated, the performance as an electronic component may be reduced, leading to a loss of efficiency or a malfunction. Therefore, a radiator shown in FIG. 7 is generally known in order to efficiently radiate the heat of the electronic component that generates such heat. The radiator 20 is made of a metal material having excellent thermal conductivity such as aluminum, and has a cross section from the flat base 21 by being subjected to casting, cold forging, or extrusion using a predetermined mold. A plurality of radiating fins 22 are formed so as to have a comb shape.

[0003]

The heat radiation efficiency of the radiator 20 is substantially proportional to the surface area of the entire radiator. Therefore, in order to enhance the heat radiation effect of the radiator 20 shown in FIG. 7, it is necessary to increase the number of the radiation fins 22. However, if the heat dissipating fins 22 are added to the limited area of the base 21, the arrangement interval must be narrowed, and the shape of the mold becomes complicated and the molding process becomes difficult. There is a problem that the cost rises.

In order to further enhance the heat radiation efficiency of the heat radiator, it is ideal to minimize the thickness t of each of the heat radiation fins 22 shown in FIG. I have. However, among the processing techniques such as casting, cold forging, and extrusion, the minimum plate thickness t of the radiation fins 22 is set to 0.8 mm even if a cold forging technique capable of relatively precise processing is used. However, it was practically difficult to obtain an ideal radiator.

Further, when the radiator 20 is formed by casting or extrusion molding, the radiator fins 22 become thicker, so that the radiator 20 necessarily becomes larger. For this reason, it cannot be used as a heat sink for a high-density semiconductor integrated circuit that requires small size and high efficiency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. The heat radiation fins can be made as thin as possible to enhance the heat radiation effect, and can be downsized. It is intended to provide a possible radiator.

[0007]

To achieve the above object, a radiator according to a first aspect of the present invention is characterized in that a thin radiating fin, which is made upright by shaving one surface of a metal plate, is thinned. Is a radiator that is integrally formed
From the position where the first radiating fin stands up to the second radiating fin.
As the distance increases in the direction of the plane in which the
Formed stepwise so that the thickness of the metal plate gradually decreases
At the same time, radiating fins are formed upright at each step
It is characterized by having.

As described above, when the metal plate is erected by shaving one surface of the metal plate so as to be thin, the thickness of the radiating fin becomes 0.8 mm.
Therefore, the internal heat storage inside the radiation fins is reduced, so that the radiation efficiency can be greatly increased.

Further, in the radiator according to a second aspect of the present invention, the radiating fins are erected from the plane of the metal plate in a rectangular shape or a curved shape.

When the radiating fins are erected in the shape of a letter or a curve, curling, which is likely to occur when one surface of the metal plate is cut thin, can be prevented beforehand, and the radiating fins themselves can be formed in a flat shape.

Further, a radiator according to claim 3 of the present invention.
Method, having a side surface for forming a heat dissipating fin of the formation
Abutting the cutter on the side of the metal plate
Move the cutter parallel to the upper surface of the metal plate
After the upper surface of the metal plate forming the upright of the first heat radiation fins and planed meat thin by, the metal the cutter
A position lowered in the thickness direction from the above side of the plate by the amount of shaving
, The cutter is released from the side surface by the first release.
Move it parallel to the upper surface of the metal plate until just before the heat fin.
Rukoto the planing trace of the first heat radiation fin and the second heat radiating fins standing formed by planing meat thin, the advance thereafter
The heat-dissipating fins are used to remove
Planing to more thin in the cutter until the front of the fin
Sequentially repeating the steps, standing forming a plurality number of radiating fins
It is characterized by doing.

If the upper surface of the metal plate is sequentially thinned and thinned by a cutter to form an upright fin, a large number of thin fins can be easily formed without the need for a special processing device. Can be manufactured at a low cost.

Further, in the method of forming a radiator according to a fourth aspect of the present invention, in addition to the third aspect, the metal radiator is formed by using a cutter formed stepwise from the center to both sides.
It is characterized in that the upper surface of the metal plate is thinly flat-cut.

When the cutter is formed in a step shape, a plurality of thin radiating fins can be simultaneously formed on the upper surface of the metal plate by one cutter. Can be reduced.

Further, according to the radiator according to claim 5 of the present invention ,
The forming method is based on the shaving allowance when flattening the upper surface of the metal plate later.
Forming a plurality of step portions by flattening in advance in a step shape having
The cutter is brought into contact with the side of this step, and
Move the cutter parallel to the upper surface of the metal plate
It is characterized by planing.

If a step portion having a small step size is previously formed on the surface of the metal plate on which the heat radiation fins are formed, the position and size of the thin flat cutting by the cutter can be set in advance.
It is possible to easily manufacture a radiation fin having a uniform thickness and height.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a radiator according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a radiator to which the present invention is applied. The radiator 1 is made of a metal plate 2 having a thickness of several mm or less and having excellent thermal conductivity, such as copper or aluminum.
On one surface of the metal plate 2, a large number of thin radiating fins 3 are formed integrally by erecting the surface of the metal plate 1 so as to be thin. As shown in FIG. 2, the radiating fins 3 can be formed to have an arbitrary thickness by appropriately setting a shaving allowance c for shaving the surface of the metal plate 2 as shown in FIG. In order to increase, the cutting allowance c
Is set to 0.01 mm to 0.8 mm, and the thickness t of the radiation fin 3 is set to be 0.8 mm or less.

The radiator 1 can be used as a package for electronic components such as a high-density integrated circuit (LSI), and a concave portion 2a for accommodating the electronic components is provided at the center of the metal plate 2. ing. In particular, since the LSI used for the CPU generates heat, heat is required. However, when the LSI is housed in the concave portion 2a of the radiator 1, the heat of the LSI reaches the radiating fins 3 via the metal plate 2, and the thin fins are thinned. 3
The heat is efficiently dissipated from

[Method of Manufacturing a Radiator] Next, a method of manufacturing a radiator according to the present invention will be described with reference to FIGS. As the metal plate 2, a metal having excellent heat conductivity, such as copper or aluminum, and having a viscosity that is not cut during cutting is selected. On the other hand, as shown in the drawing, the cutters 4 and 5 for forming the radiation fins 3 have tooth portions 4a formed on the distal end side formed in a step shape from the center to both sides. Although it is desirable to make the thickness of the cutter 4 higher than the height of the radiation fins 3 in order to reduce variation, it is not inevitable.

Two types of cutters are prepared depending on the shape of the tooth at the tip. One of the cutters 4 is a convex cutter in which a stepped tooth portion 4a is provided by protruding the center of the tip in the traveling direction indicated by an arrow as shown on the right side of FIG.
The other cutter 5 is a concave cutter provided with a stepped tooth portion 5a by retreating the center of the front end in the traveling direction indicated by an arrow as shown on the left side of FIG.

Next, a method for forming the radiation fins 3 using one of the cutters 4 will be described. First, the metal plate 2 is fixed to a flat jig (not shown) by appropriate means, and the tip of the tooth portion 4a of the cutter 4 is set as shown by a two-dot chain line in FIG.
It contacts the side surface of the metal plate 2. This contact position is 0.01 m as the size of the shaving allowance c for shaving the surface of the metal plate 2 described above.
It is set to 0.8 mm from m. Thereafter, the cutter 4 is advanced in the direction of the arrow, and when the cutter 4 is advanced a predetermined distance, the metal plate 2
Is flattened to form first radiating fins 3 having a thickness t of 0.01 mm to 0.8 mm on the teeth 4a of the cutter 4.

Thereafter, the cutter 4 is retracted, and the tip of the tooth portion 4a of the cutter 4 is again brought into contact with a position lower than the side surface of the metal plate 2 by the shaving allowance c. Then, the cutter 4 is moved forward in the direction of the arrow to flatten the trace of the first radiating fin 3 to the position retracted from the first radiating fin 3, thereby obtaining the second heat radiating fin 3. Fins 3 are formed. Thereafter, the cutter 4 is retracted, and the above-mentioned flat cutting process by the cutter 4 is sequentially repeated, so that a large number of n radiating fins 3 are provided on the surface of the metal plate 2.
Is formed upright.

The basic method of forming the heat radiation fins 3 has been described with reference to FIG. 4. However, when the convex cutter 4 shown in FIG. 3 is used, the center of the tip in the traveling direction is projected. As a result, the stepped tooth portion 4a was provided, so that a large number of radiating fins 3 having the width of the tooth portion 4a were formed on the surface of the metal plate 2 by the flattening process once with the cutter 4 so as to have the same shape as the tip side of the cutter 4. It is formed in the same convex step shape. afterwards,
In the same manner as described above, the cutter 4 is retracted, and flattening is again performed by the cutter 4 from a position lowered by a cutting allowance c from the surface of the side surface of the metal plate 2 again. A large number of heat dissipating fins 3 are formed on the surface.

As described above, when the planing is sequentially repeated using the convex cutter 4, the teeth 4 a on both sides of the cutter 4 gradually become unnecessary, and finally, only the teeth 4 a at the center of the tip end are used. In this case, one radiating fin 3 is formed.

When the concave cutter 5 shown in FIG. 3 is used, the stepped tooth portion 5a is provided by retreating the center of the front end in the traveling direction. A large number of radiating fins 3 are formed on the surface of the metal plate 2 in the same concave step shape as the tip side shape of the cutter 5. Thereafter, the cutter 5 is retracted, and the processing of performing the flat cutting with the cutter from the position lower by the shaving allowance c from the surface of the side surface of the metal plate 2 again is sequentially repeated, so that the surface of the metal plate 2 has a large amount of heat radiation. Fins 3 are formed.

In the case where the concave cutter 5 is used, on the contrary, if the planing is repeated sequentially, the central tooth portion 5a of the cutter gradually stops being used. Two radiating fins 3 are formed using only 5a.

As described above, when the tip of the tooth portion 4a or 5a is formed in a straight line like the cutter 4 or 5, the radiating fin 3 may be curled by performing the flat cutting. In order to prevent this curling, the shape of the upper end surface of the radiation fin 4 may be bent.
5 (A) and 5 (B) show an example thereof, and FIG. 5 (A) shows an example in which the metal plate 2 is bent in a V-shape from the plane.
(B) is an example of standing up in a curved shape. As described above, the heat radiation fins 3 can be easily formed to be bent and raised in the shape of a letter or a curve by making the tip of the teeth 4a or 5a of the cutter 4 or 5 a letter or a curve. .

When the radiating fins 3 are raised in the shape of a letter or a curve, the surface area of the radiating fins 3 increases, so that the heat radiation efficiency is substantially improved. In addition, when the tip of the tooth portion 4a or 5a is formed in a V-shape or a curved shape, the load on the cutter at the time of planing is reduced, so that the formation of the radiation fins 3 is further facilitated. .

In each of the above embodiments, the tip of the tooth portion 4a of the cutter 4 is brought into contact with a position lower than the surface of the side surface of the metal plate 2 by the cutting allowance c, and the cutter 4 is advanced, so that the radiation fin 3 Is formed, the height of the radiation fins 3 differs according to the forward dimension of the cutter 4. Depending on the usage of the radiator, the radiating fins 3 having a substantially uniform height may be required. For this purpose, as shown in FIG. 6, first, the upper surface of the metal plate 2 has a step of 0.01 mm to 0.8 mm which is equal to the tooth shape of the cutter 4 and substantially equal to the cutting allowance c at the time of planing. It is formed in a stepwise manner in advance. Thereafter, the tip of the tooth portion 4a of the cutter 4 is brought into contact with the side surface of the step portion 2b in the same manner as in each of the above-mentioned examples, and flattening is performed, whereby the radiation fins 3 having a substantially uniform height are obtained.

That is, by making the dimensions of the steps 2b equal, the distance for moving the cutter 4 forward becomes equal, and as a result, the distance for flat-cutting the front side of the metal plate 2 becomes equal. 3 can be formed almost uniformly. Here, the step between the steps 2b formed on the metal plate 2 is 0.01 mm to 0.8 m, which is equal to the shaving allowance c.
m, simple stamping may be used.
Can easily form a step.

Although the present invention has been described in detail with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof. For example, by providing several types of widths of the tooth portion of the cutter, and making the size of the heat dissipating fin different depending on the heat generating portion from the LSI or the like and the heat radiating path, or making the tooth portion of the cutter different in the plate thickness direction, The heat radiation efficiency may be partially changed by changing the thickness. Further, the radiation fins may be formed partially on the surface of the metal plate. Further, the radiation fins may be curled at the time of planing to reduce the dimension in the height direction.

[0033]

As described above, according to the radiator according to the present invention, the radiator fin is formed by erecting the one surface of the metal plate so as to be thin, so that the thickness of the radiator fin can be reduced to an ideal value. 0.8 mm or less required by the vessel. Therefore, since the internal heat storage in the radiation fins is reduced, the radiation efficiency can be improved. In addition, since the radiation fin itself can be made thin, the size of the radiator can be reduced. Further, since one surface of the metal plate is thinned, it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a radiator according to the present invention.

FIG. 2 is a sectional view of a main part of the radiator of the present invention.

FIG. 3 is a plan view showing a processing state of the radiator of the present invention.

FIG. 4 is a cross-sectional view illustrating a processing step in the radiator of the present invention.

FIGS. 5A and 5B are perspective views showing another embodiment of the radiation fin in the radiator of the present invention.

FIG. 6 is a cross-sectional view showing another processing state of the radiator of the present invention.

FIG. 7 is a cross-sectional view illustrating a structure of a conventional radiator.

[Explanation of symbols]

 Reference Signs List 1 radiator 2 metal plate 3 radiating fin 4,5 cutter c shaving allowance

Claims (5)

(57) [Claims] 1. A radiator comprising a plurality of thin radiating fins formed by shaving one surface of a metal plate so as to be thin, integrally with the metal plate , wherein the first radiating fins are erected.
Far from the position where the second radiating fins stand
The thickness of the above metal plate is gradually reduced
As shown in the figure, each step is
A radiator characterized in that radiation fins are formed upright . 2. The radiator according to claim 1, wherein the radiating fins stand up in a shape of a letter or a curve from the plane of the metal plate. 3. A side surface for forming a radiation fin.
Abutting the cutter on the side of the metal plate
Move the cutter parallel to the upper surface of the metal plate
After the upper surface of the metal plate forming the upright of the first heat radiation fins and planed meat thin by, the metal the cutter
A position lowered in the thickness direction from the above side of the plate by the amount of shaving
, The cutter is released from the side surface by the first release.
Move it parallel to the upper surface of the metal plate until just before the heat fin.
Rukoto the planing trace of the first heat radiation fin and the second heat radiating fins standing formed by planing meat thin, the advance thereafter
The heat-dissipating fins are used to remove
Planing to more thin in the cutter until the front of the fin
Sequentially repeating the steps, radiator method forming, which comprises standing a plurality number of radiation fins. 4. Using a cutter formed stepwise from the center to both sides, the upper surface of the metal plate is thinly flat-cut.
4. The method for forming a radiator according to claim 3, wherein: 5. Sharpening when flattening the upper surface of a metal plate later
A plurality of steps are formed by flat striking in advance into a step shape having a margin, and the cutter is brought into contact with a side surface of the step portion to form a plurality of steps.
Move the cutter from the surface in parallel with the top surface of the metal plate.
Claim, characterized in that planing By 3 Symbol
Method of manufacturing the radiator described above.