JP2003115566A - Method and forming heat dissipation fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming thin heat dissipation fins easily while ensuring safety work. SOLUTION: In the method for forming planar heat dissipation fins 13 integrally on the surface of a metal plate 11, an inclining face 12 is formed by inclining the metal plate 11 at a specified angle relative to the moving plane C of a chipping tool 16, the inclining face 12 on the upstream of a plane 18 being machined extending in parallel with the moving plane C is sliced upward in parallel with the moving plane C by means of the chipping tool 16, and the forward end part of the heat dissipation fin 13 is curled toward the metal plate 11 thus forming planar heat dissipation fins 13 while raising the fins integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator provided in an electronic component such as a semiconductor integrated circuit for efficiently radiating heat generated from the electronic component, and more particularly to a radiator integrated with a metal plate. The present invention relates to a method for forming a plate-shaped heat radiation fin.

[0002]

2. Description of the Related Art With the recent miniaturization of information equipment, miniaturization and high density of electronic component packages such as semiconductor integrated circuits and hybrid circuits have been advanced. As a result, the amount of heat generated by the semiconductor integrated circuit increases,
A radiator for heat dissipation is joined to the package and arranged, and if necessary, forced cooling is performed by a cooling fan.

FIG. 9 shows a heat radiating means which has been conventionally put to practical use. That is, the package 1 is made of a metal material, has rigidity, has good thermal conductivity as a heat spreader, and is made of a metal material that can be plastically worked, such as copper alloy, stainless steel, or aluminum.

On the one surface 1a side of the package 1, a wiring board 3 made of a flexible printed circuit board or a normal printed circuit board is mounted by an adhesive or the like, and a substantially quadrangular recess 2 is formed in the center thereof. Has been done. The chip of the semiconductor integrated circuit 5 is housed in the recess 2. The semiconductor integrated circuit 5 is fixed to the bottom surface of the recess 2 by an adhesive or the like in a surface-bonded state. A large number of terminals provided on the upper surface of the semiconductor integrated circuit 5 and the terminal portions formed on the wiring board 3 are electrically connected by the bonding wires 7. Furthermore, the semiconductor integrated circuit 5 and the bonding wires 7 are sealed in the recess 2 of the package 1 with an insulating resin. Solder balls 9 are provided on the wiring board 3 and are electrically connected to the terminal portions formed on the circuit board of an electronic device (not shown) by thermal welding.

On the other hand, a radiator 100 is joined to the other surface 1b of the package 1. Therefore, the heat generated during the operation of the semiconductor integrated circuit 5 is first transferred to the package 1 that functions as a heat spreader to radiate the heat, and then this heat is transferred to the radiator 100 to radiate outward.
The radiator 100 is formed by extruding or casting a metal material such as aluminum having a good thermal conductivity, and a large number of comb-teeth radiating fins 101 are erected substantially vertically on a base 102.

[0006]

Generally, the heat dissipation efficiency of the radiator is almost proportional to the surface area of the entire radiator. Therefore,
In order to enhance the heat radiation effect of the radiator 100 shown in FIG.
It is necessary to form many radiating fins 101 to increase the surface area. However, the limited size of the base 10
When a large number of heat radiation fins 101 are formed on 2,
It is necessary to reduce the wall thickness of the radiation fin 101 itself and to narrow the arrangement interval. However, according to a processing method such as extrusion molding or casting, there is a limit in reducing the wall thickness of the radiation fin 101, and it is difficult to obtain a radiator having an ideal radiation effect.

The present invention has been made in order to solve the problems of the conventional method as described above, and it is possible to easily form a thin radiating fin and to provide a radiating fin shape that enables safe work. It is an object of the present invention to provide a method for forming a radiation fin that can be formed.

[0008]

In order to achieve the above object, a method of forming a radiation fin according to a first aspect of the present invention is a method of forming a plate-shaped radiation fin integrally formed on the surface of a metal plate. In addition, the metal plate is inclined at a predetermined angle with respect to the moving plane of the shaving tool to form an inclined surface, and the shaving tool moves the sloping surface from the inclined surface on the upstream side of the work surface parallel to the moving plane. It is characterized in that the plate-shaped radiating fins are integrally erected by curving the radiating fins parallel to a plane and curling the tip end of the radiating fins toward the metal plate.

According to the first aspect of the present invention, when a sloping surface is formed by inclining a metal plate by a predetermined angle, and a shaving tool is moved to scrape and raise the surface of the sloping surface to form a heat dissipation fin, a workpiece to be processed Shaving from the slope upstream of the surface,
When the tip of the heat radiation fin is curled toward the metal plate, the sharp tip that is inevitably formed is concealed and the cylindrical arcuate portion is exposed to the outside. , It is possible to prevent the operator from being hindered during the installation work. In addition, thin radiating fins are easily formed on the slope, improving productivity.

According to a second aspect of the present invention, there is provided a method for forming a heat radiation fin, which is abraded from an inclined surface upstream of a work surface formed by the first heat radiation fin in parallel with a moving plane by a sharpening tool. At the same time, the step of stopping the shaving tool on the upstream side of the radiating fins and sequentially forming the second radiating fins curled with the tip end facing the metal plate in an upright manner are sequentially repeated to form a predetermined interval on the metal plate. It is characterized in that a plurality of heat dissipating fins are formed upright integrally so as to be separated from each other.

According to the invention as set forth in claim 2, from the inclined surface upstream of the surface to be machined formed by the first radiating fins, in parallel with the moving plane by the shaving tool,
By repeating the step of stopping on the upstream side of the first radiation fin, a plurality of thin radiation fins can be easily formed at a small pitch. As a result, a radiator with high heat dissipation efficiency can be obtained.

According to a third aspect of the present invention, there is provided a method for forming a radiation fin, wherein the frictional force of the blade surface of the sharpening tool is increased,
It is characterized in that the resistance when the heat radiation fin slides on the blade surface when scraping the metal plate increases the thickness of the base end of the heat radiation fin connected to the metal plate and thins the tip. I am trying.

According to the third aspect of the present invention, by changing the friction coefficient of the blade surface of the shaving tool, the radiated fins that have been abraded differ in stagnation of the meat due to the friction coefficient of the blade surface, and When the friction coefficient is large, the stagnation of the meat is large and the radiation fins have a relatively thick plate thickness, and when the friction coefficient is small, the stagnation of the meat is small and the plate is formed to a relatively thin plate thickness, and the heat radiation of any plate thickness is performed. You get a fin.

Further, according to a fourth aspect of the present invention, there is provided a method of forming a heat radiation fin, wherein a pair of shaving tools arranged in parallel are provided, and two slopes respectively inclined by a predetermined angle with respect to a moving plane of the shaving tool. And a metal plate attached to each of the two inclined surfaces of the die, and the metal plate is attached to each of the two inclined surfaces of the die in parallel with the moving plane from the inclined surface upstream of the work surface parallel to the moving plane by the scraping tool. It is characterized in that the plate-shaped heat radiation fins, which are shaving and curled so that the tips of the heat radiation fins are curled toward the metal plate, are integrally formed on the two metal plates.

According to the invention as set forth in claim 4, two metal plates are attached to each of the dies having two inclined surfaces inclined by a predetermined angle with respect to the plane of movement of the shaving tool.
By a pair of shaving tools installed in parallel, the plate-shaped radiating fins curled at the tip toward the metal plate are formed upright on the two metal plates, respectively, so productivity is doubled. .

According to a fifth aspect of the present invention, there is provided a method for forming a heat radiation fin, wherein a metal plate is pressed from one surface by a pressing punch and the other surface is provided with an inclined surface having a predetermined angle with respect to the plane of movement of the sharpening tool. The present invention is characterized in that a protrusion is formed and a plate-shaped heat radiation fin is integrally formed upright on the slope of the protrusion by the shaving tool.

According to the fifth aspect of the present invention, when the plate-shaped heat radiation fin is integrally formed upright on the slope of the protrusion formed by pressing integrally with the metal plate, the heat generating component is mounted. And the heat dissipation function by the heat dissipation fins are simultaneously achieved, and an inexpensive heat dissipation device can be provided.

According to a sixth aspect of the present invention, there is provided a method of forming a heat radiating fin, which is symmetrical with respect to one surface of a metal plate pressed by a pressing punch so that the other surface has a predetermined angle with respect to the plane of movement of the sharpening tool. Is formed, and plate-shaped heat radiation fins are integrally formed upright from both sides by the pair of left and right cutting tools with respect to the two slopes.

According to the invention described in claim 6, the metal plate is provided with a projection having two inclined surfaces having a predetermined angle, and a plate-shaped heat radiation fin is formed on the two inclined surfaces of the projection by a pair of sharpening tools. By forming, it becomes possible to form a radiator at an arbitrary position on the metal plate. Further, by forming a plurality of radiators on the metal plate, the heat radiation efficiency can be increased in proportion to the number.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a process chart showing a method of forming a radiation fin according to the first embodiment of the present invention. By this forming method, the radiator 10 shown in FIG. 2 is formed. First, the configuration of the radiator 10 will be described.

The metal material used for the radiator 10 is selected from, for example, an aluminum alloy, a copper alloy, stainless steel, etc. as a metal material which can be plastically processed and has a good thermal conductivity. The radiator 10 made of a metal material having a predetermined plate thickness is formed on one surface of the metal plate 11 by the forming method shown in FIG. 1 at a right angle to the longitudinal direction of the metal plate 11 and the same width as the metal plate 11. A plurality of thin radiating fins 13 are formed integrally with the metal plate 11. The base end portions of the plurality of heat radiation fins 13 are connected to the metal plate 11, and the tip portions thereof project so as to be separated from the metal plate 11, and the plurality of heat radiation fins 13 are formed to project at substantially the same angle and at substantially the same interval. ing.

Further, the plurality of heat dissipating fins 13 of the radiator 10 are formed such that the base end portion connected to the metal plate 11 is thick and the wall thickness is thin toward the tip end portion. The heat radiation fins 13 are curled so that they are directed toward the metal plate 11, and when viewed from above the tip ends of the heat radiation fins 13, the tip portions are formed in a substantially cylindrical shape. Further, at least the most tip end position of the heat radiation fin 13 is the same as the apex of the heat radiation fin 13, or the metal plate 1 from the apex.
I try to face in one direction.

That is, the tip of the radiation fin 13 is formed relatively sharply as described later. Therefore, when the tip end position is located above the apex of the radiation fin 13, the sharp tip may injure an operator or the like. Therefore, in order to prevent injuries, the tip of the radiation fin 13 is curled so as not to directly touch the operator.

The plate thickness of the radiation fin 13 is the same as that of the metal plate 1.
Since it is formed by shaving the surface of No. 1, it can be made thin. For example, as a radiation fin of a radiator used for a small electronic component, 0.5 mm to 0.
A plate thickness of about 1 mm is suitable. In addition, each radiation fin 13
The plate thicknesses may be the same or different from each other. Furthermore, if the thickness of the radiation fins 13 is made thicker at the base end and thinner toward the tip, the base end is thicker so that the heat capacity is large and it becomes easy to receive heat from the metal plate. After that, the heat is sequentially dissipated as the heat is transferred toward the tip portion, and even the small heat capacity at the tip portion can be easily dissipated. Since the radiating fin 13 has a plate thickness changed in accordance with heat transfer and heat radiation, a radiator having high heat radiation efficiency can be obtained.

Next, a method of forming the radiation fins 13 of the radiator 10 will be described with reference to FIG. Figure 1 (A)
Is a die 1 which is a metal plate 11 processed into the radiator 10.
4 shows the state of being placed. The metal plate 11 is made of the above-mentioned material, and has a plate thickness and a width necessary for forming the radiator 10.

The die 14 is formed with a mounting surface 14a having a predetermined inclination angle θ with respect to the plane of movement of the shaving tool 16 described later. The metal plate 11 is mounted on the mounting surface 14a in a surface-bonded state. As a result, the slope 12 is formed on the upper surface of the metal plate 11. Further, a locking portion 14b is formed above the slope of the mounting surface 14a, and the front end of the metal plate 11 is brought into contact with the mounting surface 14a to lock the metal plate 11 so as to prevent the metal plate 11 from moving rightward in the drawing. Incidentally, the inclination angle θ of the mounting surface 14a is set to about 10 degrees in the example of FIG. The inclination angle θ is appropriately determined according to the height of the heat radiation fin 13 described later, but is preferably about 5 to 30 degrees.

FIG. 1B shows a preliminary step of forming a flat surface 15 parallel to the moving direction of the shaving tool 16 on the tip of the metal plate 11. In this step, the tip of the metal plate 11 is removed by moving the cutter 17 to the right in the drawing, and the flat surface 15 is formed in advance on the slope 12. In the preliminary step, in the next fin forming step, the flat surface 15 is provided to form the plurality of heat radiation fins 13 in the same shape. The angle between the flat surface 15 and the slope 12 is the inclination angle θ. Incidentally, this preliminary step can be omitted. When the flat surface 15 is not formed, the meat on the outer end portion of the metal plate 11 moves to form a substantially cylindrical mass. Further, the cutter 17 may use a cutting tool 16 described later.

FIGS. 1 (C) and 1 (E) show the radiation fin 13
3 shows a fin forming step for forming a. Figure 1 (C)
Shows a step of forming the first radiating fins 13-1 on the slope 12 formed on the metal plate 11.

A sharpening tool 16 for forming the radiation fins 13 has a blade surface 16a inclined at a predetermined angle at each tip.
The cutting tool 16 is fixed to the movable side of a press machine (not shown). Further, the cutting edge position of the shaving tool 16 is set so as to have a shaving allowance g with respect to the plane 15 formed in the preliminary process described above.

Then, the metal plate 11 is placed on the mounting surface 1 of the die 14.
4a, and the tip is brought into contact with the locking portion 14b. After that, when the shaving tool 16 is moved in the direction of the arrow, the shaving tool 16 starts shaving and raising from the slope 12 on the upstream side of the plane 15. Further, when the shaving tool 16 is moved to a predetermined position in parallel with the plane 15, the meat grows and shavings so as to substantially follow the blade surface 16a of the shaving tool 16, and as a result, the slope 12 has the first radiating fins 13 -1 is formed.

When the radiation fins 13-1 are formed in this way, as shown in FIG. 3A, first, the shaving tool 16 starts from the slope 12 on the upstream side of the flat surface 15 formed by the preliminary process described above. When the shaving is raised, the portion of this slope is thin, and therefore the shaving tool 16 is moved to perform curling as shown in FIG. 3B, and the tip of the heat dissipating fin 13-1 has a substantially cylindrical arc surface 13a. Is formed.

As described above, the slope 1 is cut by the shaving tool 16.
When shaving is started from 2, it enters an acute angle with respect to the metal plate 11, so that the tip of the radiation fin 13-1 is formed into a knife edge shape at an acute angle. However, since the knife edge-shaped tip curls toward the metal plate 11, the radiation fin 13-
An arc surface 13a is formed at the apex of 1. Therefore, the knife edge-shaped tip is not exposed upward. Therefore, even if the worker comes into contact with the heat radiation fin during the process of manufacturing the heat radiator 10 or during the work of assembling the heat radiator 10 into another device or the like, the arc surface 13a may cause damage such as a cut. There are features that can be avoided and increase safety.

On the other hand, when the shaving tool 16 is moved, the radiating fins 13-1 are scraped and raised while the meat of the flat surface 15 grows along the blade surface 16a of the shaving tool 16. At this time, since the meat receives resistance due to the friction of the blade surface 16a of the shaving tool 16, the height of the heat radiating fins 13-1 becomes smaller than the height of the heat radiating fins 13-1 and the heat radiating fins 13-1.
Meat stagnates at the base end of 1. As a result, the plate thickness of the base end portion is large, and the wall thickness of the heat dissipation fin is reduced toward the tip end portion.

On the contrary, when the friction coefficient of the blade surface 16a is reduced, the scraped and raised meat slides smoothly on the blade surface 16a, so that the stagnation of the meat is reduced and the heat radiation fin 13-1.
The plate thickness is almost equal to the cutting margin g, and the height is also increased. In this way, the thickness and height of the radiation fin 13-1 are
Since it is affected by the friction coefficient of the blade surface 16a of the sharpening tool 16, it is possible to change the plate thickness or height of the heat radiation fin 13-1 by changing the friction coefficient of the blade surface 16a.

FIG. 1D shows a step of forming the second heat radiation fin 13-2 on the slope 12 formed on the metal plate 11. Prior to forming the second radiating fins 13-2, the cutting edge position of the cutting tool 16 is a flat work surface 1 formed by forming the first radiating fins 13-1.
8 is set at a position where the cutting margin g can be taken. Normally, the cutting tool 16 is not moved, and the die 14
Translate by minutes.

Thereafter, when the shaving tool 16 is moved in the direction of the arrow, the shaving tool 16 comes into contact with the slope 12 on the upstream side of the surface to be machined 18, and then the slope and the surface to be machined 18 are abraded and scraped. When the tool 16 is moved to a predetermined position on the upstream side of the first radiating fin 13-1 formed previously, the second radiating fin 13-2 is formed so as to be substantially along the blade surface 16a of the cutting tool 16. . The distance from the heat radiation fin 13-1 is determined by the stop position of the shaving tool 16 and can be set to any distance. It is preferable to set the interval to about 1 to 3 times the plate thickness dimension at the base end portion of the radiation fin 13.

At this time, the shaving start position of the shaving tool 16 is set on the slope 12 on the upstream side of the work surface 18 in the same manner as in the formation process of the heat dissipating fins 13-1 described above.
As a result, as the shaving tool 16 moves, it curls as shown in FIG. 3B, and a substantially cylindrical arcuate surface 13a is formed outside the tips of the heat radiating fins 13-2.

As described above, the shaving start position of the shaving tool 16 is set to the slope 12 on the upstream side of the work surface 18, and the steps of shaving the slope and the work surface 18 with the shaving tool 16 are sequentially performed. By repeating,
As shown in (E), seven plate-shaped radiating fins 13-1
13-7 are formed on the slope 12 of the metal plate 11.

When the die 14 shown in FIG. 1 is used, since the tip of the metal plate 11 is brought into contact with the engaging portion 14b and engaged, the final position of the heat radiation fin is determined by the length of the die 14. That is, the cutting allowance g can be taken with respect to the flat work surface 18 on which the radiating fins 13-6 immediately before is formed, and moreover, the upstream side of the work surface 18 where the cutting and raising starts is the end of the mounting surface 14a of the die 14. The position corresponding to the part is the limit. For example, when a large number of radiating fins 13 are continuously formed on a long metal plate 11 such as a hoop material, for example, a clamping means for the metal plate 11 is provided on the upstream side of the blade surface 16a of the sharpening tool 16. Should be provided. That is, the fin forming process is performed in a state where the metal plate 11 is clamped, and thereafter, the tip of the metal plate 11 is opened by arranging the fin so that it can be moved to the position where the next heat radiation fin is formed. The radiation fin 13 can be formed.

After the radiation fins 13-7 are formed, the sloped surface 12 of the metal plate 11 is left with substantially the surface 18 to be processed. The surface 18 to be processed may be connected and fixed to a heat generating portion of a device (not shown) depending on the application. In addition, depending on the application, processing such as cutting the surface 18 to be processed may be performed to form the shape according to the application. Further, when cut from the vicinity of the radiation fin 13-7, the cut end face may be brought into contact with the locking portion 14b of the die 14 to form the radiation fin 13 again. At this time, if the surface 18 to be processed remains, the above-described preliminary step shown in FIG. 1B can be omitted.

FIGS. 4A and 4B show changes in the shape of the heat radiation fin depending on the angle of the blade surface of the cutting tool. Figure 4
(A) is a case where the angle of the blade surface 21a of the sharpening tool 21 is formed to be an acute angle, and the sliding friction of the blade surface 21a is smaller than that of the sharpening tool 16 shown in FIG. As a result, since the resistance due to the friction of the blade surface 21a of the sharpening tool 21 is small,
Radiating fin 22 scraped and raised by the scraping tool 21
Curls with a plate thickness slightly thicker than the above-described cutting margin g and has a large curvature as a whole. In addition, the radiation fin 2
Similarly to the above-mentioned example, the tip of 2 indicates the shaving start position of the shaving tool 21 at the slope 1 on the upstream side of the processed surface 18.
By setting it to 2, a substantially cylindrical arcuate surface is formed.

FIG. 4B shows the blade surface 23a of the sharpening tool 23.
Is an example in which the angle is formed to be an obtuse angle, and the sliding friction of the blade surface 23a is larger than that of the above-described shaving tool 16. As a result,
Since the meat is often stagnant due to the friction of the blade surface 23a of the scraping tool 23, the radiation fins 24 scraped by the scraping tool 23 have a plate thickness thicker than the scraping allowance g described above. Further, when the thickness is increased, the curling phenomenon is suppressed as a whole, and the entire surface becomes substantially flat. The tip of the radiation fin 24 has a substantially cylindrical arc surface by setting the shaving start position of the shaving tool 21 on the slope 12 on the upstream side of the surface 18 to be processed, as in the above-described example. It is formed. Thus, by changing the angle of the blade surface of the sharpening tool, the frictional force of the blade surface changes, and as a result, the plate thickness and height of the heat radiation fin can be changed.

In the above example, the radiation fin 1
3, 22, 24 may curl entirely.
If you want to make the radiating fins almost flat except the curling part of the thin tip, install a guide (not shown) parallel to the blade surface of the sharpening tool, and cut between the guide and the blade surface. This can be prevented by allowing the radiating fin to be raised and straightening the radiating fin by the guide. Further, the blade surface of the sharpening tool does not have to have a predetermined angle with respect to the traveling direction, and may be formed at a right angle to the moving direction. Further, the blade surface of the sharpening tool does not necessarily have to be a flat surface and may be a concave surface or a convex surface.

FIG. 5 shows a method of forming the radiation fins on two metal plates at the same time. FIG. 5A shows a radiator 1
It shows a state in which two metal plates 31 and 32 processed into 0 are placed on the die 33. The metal plates 31 and 32 are made of the above-mentioned metal material, and have a plate thickness and a width necessary to form the radiator 10 described above.

The die 33 has a pair of mounting surfaces 33a, each having a predetermined inclination angle θ with respect to the moving plane C of the cutting tools 36 and 37 for cutting up the radiation fins 13 described later.
33b is formed. By mounting the metal plates 31 and 32 in a surface-bonded state on the mounting surfaces 33a and 33b, slopes 34 and 35 are formed on the metal plates 31 and 32, respectively. Furthermore, above the slopes of the mounting surfaces 33a and 33b,
Locking bodies 36 and 37 are provided, respectively, and the tips of the metal plates 31 and 32 are brought into contact with each other to lock the metal plates 31 and 32 so as to prevent the metal plates 31 and 32 from moving rightward in the drawing.

Incidentally, the inclination angle θ of each of the mounting surfaces 33a and 33b is about 10 as in the example shown in FIG.
It is tilted. The inclination angle θ may be set to about 5 to 30 degrees. The metal plates 31 and 32 may be long hoop materials or plate materials cut into predetermined dimensions. In the case of the hoop material, as shown in the drawing, the die 33 is slightly curved on the front side on the left side in the drawing to join the two.

Thereafter, in a preliminary step, flat surfaces 38 and 39 parallel to the moving plane C of the pair of shaving tools 40 and 41 are formed at the tips of the two metal plates 31 and 32. Basically, FIG. Since it is similar to the preliminary step shown in (B), its description is omitted.

5B and 5C show a fin forming process for forming the heat radiation fin 13. FIG. 5 (B)
Is the slopes 34, 3 formed on the two metal plates 31, 32.
5 shows the step of forming the first radiation fin 13-1.

The pair of shaving tools 40, 41 for forming the radiation fins 13-1 have blade surfaces 40a, 41a inclined at a predetermined angle at their tips, and the pair of shaving tools 40, 41 are The base end portions are fixed to the connecting member 42, and the base end portions are fixed to the movable side of a press machine (not shown) via the connecting member 42 so as to move integrally. Further, the cutting edge positions of the shaving tools 40 and 41 are set at intervals such that a shaving allowance g is obtained with respect to the planes 38 and 39 formed in the preliminary process described above.

The two metal plates 31 and 32 are attached to the die 3
3 is placed on the placing surfaces 33a and 33b, and the tips are brought into contact with the locking bodies 36 and 37. After that, the sharpening tool 40,
41 is moved in the direction of the arrow to start shaving from the slopes 34, 35 on the upstream side of the planes 38, 39, and the shaving tool 4
0 and 41 are moved to a predetermined position. At this time, the shaving tools 40 and 41 shave the meat on the flat surfaces 38 and 39, and the meat grows substantially along the blade surfaces 40a and 41a, so that the first radiating fins 13-1 are simultaneously formed. Then, in the marks on which the first heat dissipation fins 13-1 are formed, the work surfaces 43, 4 parallel to the moving directions of the cutting tools 40, 41 are formed.
4 is formed.

In this way, when forming the radiation fins 13-1 on the two metal plates 31 and 32, as shown in FIG. 3 (A), first, the shaving tools 40 and 41 are formed by the preliminary process described above. Slope 3 on the upstream side of the flat surfaces 38 and 39
Shave from 4, 35. Since the portion of this slope is thin, it is curled as shown in FIG. 3B by the movement of the cutting tools 40 and 41, and a substantially cylindrical arc surface 13a is formed outside the tip of the heat radiation fin 13-1. . As described above, by forming the arc surface 13a, even if the worker comes into contact with the heat radiation fin during the process of manufacturing the heat radiator 10 or during the work of assembling the heat radiator 10 into another device or the like, a cut or the like may occur. Harm can be avoided and safety can be improved.

In FIG. 5C, the second heat radiating fin 1 is formed on each of the slopes 34 and 35 formed on the two metal plates 31 and 32.
3 shows a step of forming 3-2. Prior to forming the second radiating fins 13-2, the distance between the cutting edges of the cutting tools 40 and 41 is set to be a flat work surface 43 formed on each by the formation of the first radiating fins 13-1, The distance is set to 44 so that the cutting margin g can be obtained.

Thereafter, the pair of shaving tools 40, 41 are moved in the directions shown by the arrows to abut the upstream side slopes 34, 35 of the surfaces 43, 44 to be machined, and further the slopes 34, 35.
Also, the surfaces 43 and 44 to be processed are scraped off and moved to a predetermined position. As a result, the blade surface 4 of the sharpening tool 40, 41
0a, 41a so as to extend substantially along the second radiating fin 1
3-2 are formed respectively. The distance from the heat radiation fin 13-1 is determined by the stop position of the shaving tool 16 and can be set to any distance. It is preferable to set the interval to about 1 to 3 times the plate thickness dimension at the base end portion of the radiation fin 13.

At this time, the shaving start positions of the pair of shaving tools 40, 41 are the same as in the process of forming the radiating fins 13-1 described above, and the slopes 34, 44 on the upstream side of the respective surfaces 43, 44 to be machined. Set to 35. As a result, the sharpening tool 4
Due to the movement of 0 and 41, the tips of the heat radiating fins 13-2 are curled as shown in FIG. 3B, and the substantially cylindrical arc surface 13a is formed.

As described above, the pair of shaving tools 40, 41
Is set to the slopes 34 and 35 on the upstream side of the surfaces 43 and 44 to be machined, and the process of shaving the slope and the surface to be machined by the shaving tools 40 and 41 is sequentially repeated to obtain two sheets. A plurality of plate-shaped heat radiation fins 13 are formed on the metal plates 31 and 32.

In the method of forming the radiation fin shown in FIG. 5, after the radiation fin 13 is formed on each of the two metal plates 31 and 32, the distance between the pair of sharpening tools 40 and 41 is reduced by a cutting margin g. Although the heat radiation fin is narrowed to form the next heat radiation fin, two metal plates 31,
The radiating fins may be formed by sequentially moving 32 in the downstream direction.

That is, the die 33 is provided with the shaving tools 40, 41.
Since a pair of mounting surfaces 33a and 33b having a predetermined inclination angle θ with respect to the moving direction of the workpieces are formed, by moving the two metal plates 31 and 32 in the downstream direction, the workpiece surface 43, The spaces between 44 are separated. If the gap is moved to a position where it becomes the cutting margin g and is fixed by an appropriate means, the radiation fin can be formed by moving the pair of cutting tools 40 and 41 without changing the gap. The method of sequentially moving the metal plates to form the heat radiation fins can be applied to the above-described forming method shown in FIG.

As a modification of the forming method shown in FIG. 5, a radiator 50 having a substantially mountain shape as shown in FIG. 6 can be formed. That is, one metal plate 51 is bent in two and formed into a substantially mountain shape. Then, a pair of slopes 52 and 53 having the same predetermined inclination angle are formed on the left and right, and thereafter, heat is radiated to the two slopes 52 and 53 by a pair of shaving tools substantially the same as those shown in FIG. The fin 54 is formed. Then, similarly to each of the above-described steps, the tip of the heat radiation fin 54 is curled by contacting and moving a pair of shaving tools from the slope on the upstream side of the surface to be processed formed on the two slopes 52 and 53. By doing so, a cylindrical arcuate surface is formed.

FIG. 7 shows an example in which a radiator is integrally formed on a metal plate. The metal plate 60 is selected from a metal material which is plastically workable and has a good thermal conductivity, and which is formed in a flat plate shape such as aluminum, copper or stainless steel. The metal plate 60 is a protrusion having a slant surface 61 having a predetermined angle with respect to the moving direction of the sharpening tool on the other surface by cutting and raising one side with one side connected by a pressing punch (not shown). Form a piece 62.

Thereafter, a plurality of plate-shaped heat radiation fins 63 are integrally formed upright on the slope 61 of the projecting piece 62,
The radiator 64 is integrally formed on the metal plate 60. That is, as in the steps shown in FIG.
A plurality of radiating fins 63 are formed by sequentially repeating the shaving and raising process of moving the radiating fins in parallel with the radiating fins. Also in the step of forming the heat radiation fin 63, similarly to the above-mentioned example, the tip of the heat radiation fin 63 is curled by abutting and moving the shaving tool from the slope on the upstream side of the surface to be processed, and the shape of the cylindrical shape is formed. An arc surface is formed.

FIG. 8 shows another example in which a radiator is integrally formed on a metal plate. A metal plate 70 made of the same metal material as that used in the above-described example is pressed from one surface by a pressing punch (not shown) to form a side surface substantially trapezoidal protrusion 71 on the other surface.
The projection 71 is formed with two slopes 72 and 73 which are inclined at a predetermined angle with respect to the moving direction of the sharpening tool. Slope 7
The inclination angles of 2 and 73 are set to 5 to 30 degrees when the moving plane of the shaving tool is parallel to the plane of the metal plate 70, as in the example shown in FIG.

After that, the two slopes 72, 7 of the protrusion 71 are
3, a plurality of plate-shaped heat radiation fins 74 and 75 are integrally formed upright. That is, similarly to each step of FIG. 1 described above, the shaving and raising step of moving the shaving tool in parallel with the metal plate 70 is sequentially repeated to form the radiating fins individually to form the plurality of radiating fins 74 and 75. By the metal plate 70
The radiator 76 is integrally formed on the. The example of FIG. 8 is different from each of the examples described above in that two slopes 7 facing each other are provided.
The heat radiation fins 74 and 75 are formed by simultaneously shaving the right and left sides of the second and the third 73 with a pair of shaving tools (not shown) that move in opposite directions.

It is desirable to form a plane 77 parallel to the moving direction of the shaving tool as a preliminary step before forming the first radiation fin on the two slopes 72 and 73.
Also in this step, a pair of cutters (not shown) that move in opposite directions simultaneously remove the vicinity of the top of the protruding piece 71 from the left and right directions so that the flat surface 77 is formed over the entire top of the protruding piece 71. ing.

The radiating fins 74,
Also in the step of forming 75, similar to the above-mentioned example,
The shaving tool is brought into contact with and moved from the slope on the upstream side of the surface to be processed, so that the tips of the heat radiation fins 74 and 75 are curled to form a cylindrical arc surface.

Although FIGS. 7 and 8 show an example in which one radiator 64, 76 is integrally formed on a metal plate, after forming the radiator, a second radiator is formed on another portion of the metal plate. It is also possible to form a plurality of radiators, such as forming a radiator in the same manner. In this way, the metal plate on which one or more radiators are formed is equipped with a heating element or the like that requires heat radiation, such as a package containing a semiconductor integrated circuit (not shown), and heat is radiated from the radiator through the metal plate. To cool the heating element and so on. Moreover, in the example shown in FIG.
A heat generating element such as a semiconductor integrated circuit may be mounted on 7.

In the embodiment described above, an example is shown in which all the radiation fins are formed to have the same size. For example, the dimensions of the individual radiation fins are set so that the tips of the plurality of radiation fins are parallel to the virtual center plane. May be formed differently. At this time, the adjustment of the dimension can be arbitrarily set by the moving dimension of the shaving tool. In addition, the heat radiation fin is a metal plate 2
It was formed to have the same width as the two slopes, but it is made narrower than the width of the metal plate and partially formed at any position,
Alternatively, the radiation fins may be divided into two rows and formed. Further, the metal plate may be formed in an appropriate shape such as a rib. Furthermore, when the metal plate is bent into a substantially trapezoidal shape, the upper pedestal portion may be widened to separate the two slopes, and various heating elements can be mounted on this pedestal portion. The present invention is not limited to these embodiments and can be variously modified without departing from the present invention.

[0068]

As described above, according to the method of forming a radiation fin of the present invention, a sloping surface is formed by inclining a metal plate at a predetermined angle, and a shaving tool is moved to scrape the surface of the sloping surface to radiate the radiating fin. When forming, the sharp tip that is inevitably formed is hidden because the tip of the heat radiation fin is curled toward the metal plate by shaving from the slope upstream of the surface to be processed. Since the cylindrical arc portion is formed and exposed, it is possible to prevent the worker from being obstructed during the manufacturing process of the radiator or the mounting work. In addition, thin radiating fins are easily formed on the slope, improving productivity. On the other hand, by changing the friction coefficient of the blade surface of the shaving tool, the stagnation state of the scraped meat can be made different, and a radiation fin with an arbitrary plate thickness can be obtained. Further, since the base end portion connected to the metal plate is formed to have a thicker wall thickness and a thinner wall toward the front end portion, it is possible to enhance the heat radiation efficiency as a radiator.

[Brief description of drawings]

1A to 1E are explanatory views showing a method of forming a heat radiation fin according to the present invention.

FIG. 2 is a perspective view showing an embodiment of a radiator according to the present invention.

3 (A) and 3 (B) are explanatory views showing a radiated fin in a raised state.

4A and 4B are front views showing another cut-and-raised form according to the present invention.

5A to 5C are process explanatory views showing another method of forming a heat radiation fin according to the present invention.

FIG. 6 is an explanatory view showing another embodiment of the radiator according to the present invention.

FIG. 7 is a perspective view showing a radiator according to still another embodiment of the present invention.

FIG. 8 is a perspective view showing a radiator according to still another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a package structure using a conventional radiator.

[Explanation of symbols]

10 radiator 11 metal plate 12 slopes 13 Radiation fin 13a arc surface 14 dies 16 sharpening tools 16a blade surface 18 Worked surface C moving plane g Cutting allowance θ inclination angle

Claims (6)

[Claims] 1. A method for forming a plate-shaped heat radiation fin integrally formed on a surface of a metal plate, wherein the metal plate is inclined at a predetermined angle with respect to a moving plane of a shaving tool to form an inclined surface, and the movement is performed. The shaving tool, which is parallel to the plane and is located upstream of the surface to be machined, is cut and raised parallel to the moving plane, and the tip of the radiating fin is curled toward the metal plate to form a plate-shaped radiating fin. A method for forming a heat radiation fin, characterized in that it is formed upright integrally. 2. A shaving tool raises the shaving tool parallel to a moving plane from an inclined surface upstream of the work surface formed by the first radiating fins, and stops the shaving tool upstream of the radiating fins. 2. A plurality of radiating fins are integrally erected on the metal plate at predetermined intervals by sequentially repeating the step of integrally erection of a second radiating fin having a tip portion curled toward a metal plate. The method for forming a heat radiation fin according to. 3. A base end portion of a radiation fin connected to the metal plate by increasing frictional force of the blade surface of the sharpening tool and resistance when the radiation fin slides on the blade surface when the metal plate is scraped up. 2. The method for forming a radiation fin according to claim 1, wherein the plate thickness is made thick and the tip portion is made thin. 4. A pair of shaving tools arranged side by side in parallel, and two shaving tools which are inclined at a predetermined angle with respect to a moving plane of the shaving tool.
And a metal plate attached to each of the two slopes of the die, the metal plate being attached to each of the two slopes of the die. 2. The method for forming a radiation fin according to claim 1, wherein plate-shaped radiation fins that are curled up in parallel and curled at the tip of the radiation fin toward the metal plate are formed upright integrally with the metal plate. 5. A projecting piece having a slant surface which is pressed from one surface of a metal plate by a pressing punch and has a predetermined angle with respect to the moving plane of the scraping tool is formed on the other surface, and the scraping tool is formed on the slant surface of the projecting piece. The method for forming a heat radiation fin according to claim 1, wherein the plate-shaped heat radiation fin is integrally formed upright. 6. A projecting platform having two symmetrical sloping surfaces, which are pressed from one surface of a metal plate by a pressing punch and have a predetermined angle with respect to the moving plane of the sharpening tool, is formed on the other surface. The plate-shaped heat radiation fins are integrally formed upright from both sides by a pair of left and right sharpening tools.
The method for forming a heat radiation fin according to.