JP7241269B2 - Formation method of radiation fins - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming radiating fins that are erected on a radiator, and more particularly to a cutting method for cutting and removing a portion of a plurality of radiating fins formed on a metal plate.

A radiator for dissipating heat generated from an electronic component such as a semiconductor integrated circuit is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-32755 (Patent Document 1). In this heat radiator, a plurality of plate-shaped heat radiating fins are integrally formed by digging up one surface of a metal plate having good thermal conductivity with a digging tool.
When a heat-generating electronic component such as an integrated circuit chip is arranged on the other surface of a heat sink in which a plurality of heat-dissipating fins are integrally formed on one surface of a metal plate, the heat generated from the heat-generating electronic component is dissipated. is transmitted to the heat radiating fins through the metal plate, and the heat is radiated into the air from the surface of the heat radiating fins. At this time, since the base ends of the radiating fins are integrally connected to one surface of the metal plate, the heat generated from the heat-generating electronic component is quickly transferred to the radiating fins, so that the heat radiation efficiency is enhanced.

In the radiator formed by the method described above, a relatively large space is required to allow the cooling medium to flow between the plurality of heat radiating fins. In this way, if an attempt is made to form a large interval between adjacent heat radiating fins, the plate thickness of the heat radiating fins inevitably increases. As described above, the heat radiating fins are formed by digging the metal plate with a digging tool, so the stress on the metal plate increases as the plate thickness increases. However, if the plate thickness of the radiating fins is made thin to the extent that stress is not applied, the interval between the adjacent radiating fins inevitably becomes small. As a result, the cooling medium does not sufficiently flow between the heat radiation fins, resulting in a problem of loss of cooling efficiency.

In order to solve this problem, Japanese Patent Application Laid-Open No. 2011-243933 (Patent Document 2) discloses a plurality of plate-shaped heat sinks formed upright at predetermined intervals on one surface of a metal plate having good thermal conductivity. In a heat sink integrally provided with a heat radiating part having fins, the heat radiating fins are erected by digging a metal plate with a digging tool, and the distance between the adjacent heat radiating fins is doubled or more by cutting the heat radiating fins. It has been proposed to increase the cooling efficiency by circulating a cooling medium between the radiating fins by forming the fins large.

JP 2009-32755 A JP 2011-243933 A

In the radiator disclosed in Patent Document 2, as a method of forming a large gap between adjacent heat radiating fins, first, in the excavating step, the cutting edge of the excavating tool is brought into contact with one surface of the metal plate, and then it is cut at a predetermined angle. , and the blade of the excavating tool excavates from one surface of the metal plate toward the other surface to integrally form the radiating fins, and then moves the excavating tool in the horizontal direction. By repeating the step of cutting and removing the base ends of the heat radiation fins and forming the heat radiation fins upright and the step of cutting the base ends of the heat radiation fins formed upright, the intervals between the heat radiation fins are increased. .

However, when cutting the base end of the heat radiating fin by moving the digging tool in the horizontal direction, if the digging tool is moved beyond the thickness of the base end of the heat radiating fin for cutting, so-called breakthrough cutting, the digging tool There have been many problems that a large stress is generated in the blade portion of the blade, and the blade portion is damaged. As a result, the heat radiating fins may be bent without being cut, and furthermore, the excavating tool must be replaced more frequently, resulting in a problem of impeding productivity.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for forming heat radiating fins that can significantly reduce the stress of the excavating tool that occurs when heat radiating fins are formed on one surface of a metal plate, thereby prolonging the life of the tool. That's what it is.

In order to solve the above-mentioned problems, a method for forming a radiation fin according to the invention of claim 1 digs up a metal plate with a blade formed on the tip side in the moving direction to erect an inclined plate-shaped radiation fin. A digging tool to be formed and a fin-raising block integrally held on the forward side of the digging tool and pressing the vertically formed radiating fins in a vertical direction are provided in a moving part, and the moving part comprises the above-mentioned In the fin forming mode for digging out the heat radiating fins, the digging tool is moved forward and backward at a predetermined angle with respect to the plane of the metal plate, and in the cut mode for half-cutting the base of the heat radiating fins, it is moved horizontally in the forward direction, The gist of the present invention is that the half-cut radiating fin is pressed by the fin raising block to cut the half-cut base when the next radiating fin is dug up by the digging tool .

Further, the invention according to claim 3 is based on the invention according to claim 1, wherein the fin-raising block moves integrally with the digging-up tool when digging up the heat radiating fins next time, and is erected in advance. The metal plate is brought into contact with the slanted radiating fins and pressed until it becomes perpendicular to the plane of the metal plate.

According to the method for forming the radiating fins of the present invention, the excavating tool is moved horizontally in the forward direction to half-cut the base of the radiating fins, and then the fins are pressed by the fin-raising block that erects the radiating fins in the vertical direction. Since the half-cut portion is cut, stress due to breakthrough is eliminated on the cutting edge of the excavating tool. In addition, since damage to the cutting edge of the excavating tool is reduced, the problem that the radiation fins are not cut due to insufficient half-cutting can be resolved. Furthermore, since the stress on the cutting edge is eliminated, it is possible to extend the life of the excavating tool.

Further, by repeating the fin formation mode for digging out the heat radiating fins , a plurality of heat radiating fins are formed upright at predetermined intervals with respect to the metal plate. be able to. Therefore, by appropriately setting the fin forming mode and the cutting mode, it is possible to form heat dissipating fins at appropriate intervals.

Furthermore, since the fin raising block moves integrally with the digging tool, when digging up the next radiating fin, it is brought into contact with and pressed against the slanted radiating fins that have been formed upright in advance, so that the fin raising block moves on the plane of the metal plate. It can be erected vertically with respect to. Therefore, since the vertical formation of the radiating fins can be simultaneously performed in the process of the fin forming mode using the excavating tool, it is possible to shorten the working time and reduce the cost.

1 is a perspective view showing a heat sink having heat radiating fins according to the present invention; FIG. It is a side cross-sectional view which shows the formation state of a heat radiating fin. (A) to (H) are process explanatory diagrams showing the formation process of the heat radiating fins.

A method for forming a heat radiation fin according to the present invention includes a digging tool that digs up a metal plate with a cutting edge formed on the tip side in the moving direction to form an inclined plate-shaped heat radiation fin, and a forward side of the digging tool. and a fin-raising block that is integrally held with the body and presses the vertically formed radiating fins in a vertical direction. advances and retreats at a predetermined angle with respect to the plane of the metal plate, and in the cut mode for half-cutting the base of the heat radiating fin, it is horizontally moved in the forward direction, and the half-cut heat radiating fin is moved to the next heat radiating fin is pushed by the fin -raising block to cut the half-cut base portion when the fin-raising block digs up the fin.

Hereinafter, a method for forming a radiation fin according to the present invention will be described with reference to the drawings. FIG. 1 shows a radiator having heat radiating fins formed by a method of forming heat radiating fins according to the present invention. The radiator 1 is based on a metal plate 2 of copper, iron, iron-nickel alloy, aluminum, or the like, which has good thermal conductivity. A heat radiating portion 3 is integrally formed on one surface 2 a of the metal plate 2 . The heat radiating portion 3 is composed of a plurality of plate-like heat radiating fins 3a.

The base ends of the radiation fins 3a are integrally connected to one surface 2a of the metal plate 2, as shown in FIG. A fin group consisting of a plurality of radiating fins 3a indicated by a solid line is erected at the same intervals, and between these fin groups, the radiating fin 3a is cut from the base as indicated by a two-dot chain line. A gap 4 is formed. The space between the radiating fins 3a of these fin groups and the bottom surface of the gap 4 from which the radiating fins 3a are cut are formed substantially flat. , has a slightly uneven surface. The thickness of the bottom surface of the gap portion 4 is appropriately set depending on the thickness of the metal plate 2 and the height of the heat radiation fins 3a, but is approximately 1/2 to 1/3 of the thickness of the metal plate 2. is. Further, around the heat radiating portion 3, a flange portion 2b having the thickness of the metal plate 2 itself is formed.

Further, the plate thickness of the heat radiation fins 3a is formed by excavating from one side of the metal plate 2 with a thin cutting margin, so that the plate thickness is 0.02 mm to 0.5 mm. . Also, the spacing between the adjacent radiation fins 3a can be arbitrarily set, and is generally set to be at least twice the plate thickness of the radiation fins 3a.

As shown in FIG. 2, in the fin forming apparatus for erecting the heat radiating fins 3a, the moving part 5 is attached to a driving device (not shown) and has a predetermined angle θ with respect to the plane of the metal plate 2 described later. move forward and backward while A digging tool 6 is attached to the tip side of the moving portion 5 in the moving direction (right direction in the drawing), and a blade portion 6a is formed on the tip side of the moving direction. The width of the blade portion 6a is set smaller than the width of the metal plate 2, as shown in FIG. The width of the blade portion 6a is appropriately set according to the width of the radiation fins 3a, which will be described later.

A fin raising block 7 is held integrally with a digging tool 6 in the moving part 5 . A pressing plate 8 is arranged on the fin raising block 7 in a direction perpendicular to the moving direction of the moving portion 5 . The width of the pressing plate 8 is substantially the same as the width of the radiation fins 3a, which will be described later. Further, the lower end of the pressing plate 8 is dimensioned so that it can pass over the top of the heat radiating fins 3a to be described later when the moving part 5 is retracted.

On the other hand, the excavating tool 6 is formed with a sliding contact surface 6b inclined upward from the blade portion 6a. The sliding contact surface 6b has a low coefficient of friction so as not to cause resistance when digging and forming the radiating fins 3a. As a result, when the radiating fins 3a are dug and formed, the metal plate 2 slides along the slidable contact surface 6b without receiving the resistance of the slidable contact surface 6b. becomes possible. The inclination angle θ of the moving part 5 and the excavating tool 6 is appropriately set depending on the height and plate thickness of the radiation fins 3a, which will be described later, or the material of the metal plate 2. is set.

Further, the moving part 5 digs up the radiating fins 3a and moves horizontally with respect to the plane of the metal plate 2 when the blade part 6a of the digging tool 6 reaches the lowest point. The dimension of this horizontal movement is set to about 1/2 to 1/3 of the plate thickness of the radiating fins 3a formed upright.

Next, with reference to FIG. 3, a fin forming mode in which the heat dissipating fins are formed upright and a cut mode in which the heat dissipating fins are half-cut and cut by the above-described heat dissipating fin forming apparatus will be described. The metal plate 2 used as the radiator 1 is made of a metal material that can be plastically worked and has good thermal conductivity, such as aluminum, an aluminum alloy, a copper alloy, or stainless steel. A material having a predetermined plate thickness is used.

First, in the fin forming mode, the cutting edge 6a of the excavating tool 6 is positioned away from one surface of the metal plate 2, as shown in FIG. 3(A). In this state, the radiating fins 3a are formed upright in advance. The radiation fins 3 a are inclined with respect to the plane of the metal plate 2 . After that, as shown in FIG. 3B, the excavating tool 6 is moved in the direction of the arrow at a predetermined angle θ by the moving part 5, and brought into contact with the position where the excavating allowance can be obtained. , the metal plate 2 is dug up and the radiating fins 3a are gradually erected. At this time, the pressing plate 8 arranged on the fin raising block 7 moves integrally with the digging tool 6, and approaches the tilted radiating fins 3a which are erected in advance.

Further, when the excavating tool 6 and the fin raising block 7 are moved, as shown in FIG. is formed standing up. At this time, the fin raising block 7 moves along with the movement of the excavating tool 6, and the pressing plate 8 presses the radiating fins 3a, which have been erected in advance, to correct them to stand just before the vertical.

From this state, the cut mode is subsequently entered. In the cut mode, as shown in FIG. 3(D), the moving part 5 is moved in a direction parallel to the plane of the metal plate 2 to move the excavating tool 6 in the horizontal direction, thereby half-cutting the base of the heat radiating fin 3a. A half-cut portion 3b is formed. At this time, the dimension for moving the blade portion 6a of the excavating tool 6 is about 1/2 to 2/3 of the plate thickness of the radiation fins 3a, and is set to such a dimension that the radiation fins 3a are not cut. . Forming the half-cut portion 3b on the heat radiating fin 3a in this way greatly reduces the stress when cutting with the blade portion 6a of the digging tool 6, so that the life of the blade portion 6a can be extended. In this cutting mode, by horizontally moving the moving part 5, the pressing plate 8 further presses the heat radiating fins 3a, which have been erected in advance, so that the fins 3a are vertically erected.

Thereafter, as shown in FIG. 3(E), the moving part 5 is retracted to a position for erecting the next radiation fin, and the initial state shown in FIG. 3(A) is restored. Then, as shown in FIG. 3(F), the fin formation mode is entered again, and the digging tool 6 is moved in the direction of the arrow at a predetermined angle θ by the moving part 5, thereby forming the next radiation fin 3a. is gradually formed. At this time, the pressing plate 8 arranged on the fin raising block 7 moves integrally with the digging tool 6, and presses the previously formed radiating fins 3a. Since the radiating fins 3a have the half-cut portion 3b at the base in the cutting mode in advance, the radiating fins 3a are cut off from the base by a slight pressing force of the pressing plate 8 as shown in FIG. 3(G). , detach from the metal plate 2 . As a result, the distance between the adjacent heat radiating fins 3a is twice the distance between the plurality of heat radiating fins 3a formed upright in advance.

After that, as shown in FIG. 3(H), the moving part 5 is retracted again to the position for forming the next radiating fin upright to return to the initial state. When the radiating fins 3a are formed upright and the distance between the adjacent radiating fins 3a is increased, the mode is shifted to the cut mode to form the half-cut portions 3b on the radiating fins 3a, and then the radiating fins 3a are pressed by the pressing plate 8 to be cut. By doing so, the radiator 1 shown in FIG. 1 is manufactured.

As described above, by forming the adjacent radiating fins 3a at appropriate intervals in the fin forming mode, the cooling medium is sufficiently circulated between the radiating fins 3, so that the cooling efficiency is enhanced.

Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments, and can be variously modified without departing from the scope of the invention. For example, although the flange portion having the thickness of the metal plate itself is formed around the heat radiating portion, heat radiating fins may be formed on the metal plate so as to have the same width. Also, a heat radiating portion composed of a plurality of heat radiating fins may be provided at a plurality of locations on the metal plate so as to correspond to the positions of the heat generating components that require heat radiation.

1 Radiator 2 Metal plate 3a Radiation fin 3b Half-cut part 4 Gap part 5 Moving part 6 Excavating tool 6a Blade part 7 Fin raising block 8 Pressing plate

Claims (2)

An excavating tool for excavating a metal plate to form an inclined plate-shaped radiation fin upright by a blade formed on the tip side in the moving direction, and an excavating tool integrally held on the forward side of the digging tool to form the upright radiation fin. A moving part is provided with a fin raising block that presses the heat radiation fins in a vertical direction,
The moving part advances and retreats the excavating tool at a predetermined angle with respect to the plane of the metal plate in a fin forming mode for digging up the heat radiating fins, and moves forward in a cutting mode for half-cutting the base of the heat radiating fins. move horizontally in the direction of
A method of forming a heat radiation fin, wherein the half-cut heat radiation fin is pressed by the fin raising block when the next heat radiation fin is dug up by the excavating tool to cut the half-cut base. The fin-raising block is moved together with the digging tool when digging up the next radiation fins, and is brought into contact with the inclined radiation fins formed upright in advance so as to be perpendicular to the plane of the metal plate. 2. The method of forming a heat radiating fin according to claim 1, wherein the pressing is performed until

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