Method for forming a heat sink

Abstract

To provide a radiator which can couple a scrap generated when cutting a tip end of a plate-like radiation fins with a thin film, and can prevent from being scattered.SOLUTION: A radiator 1 is stood and formed by separating a plurality of heat radiation fins 3 formed from a metal plate 2 in a plate shape. Each heat radiation fin 3 is vertically stood from a flat surface 2a of the metal plate 2, and an inclination surface 3c that each tip end is inclined to the flat surface 2a is formed so as to have a different height of the other end side 3b with one end side 3a of a width direction. A coupling part 5 temporally coupling a base part of a scrap 4 generated when inclining each heat radiation fin 3 by a cutting is formed between the other end side 3b of each heat radiation fin 3 and the flat surface 2a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat sink in which a plurality of plate-shaped heat dissipation fins are erected on a metal plate.

Background Art

[0002] Heat sinks are used to dissipate heat generated from electronic components such as semiconductor integrated circuits and light-emitting diodes, or industrial equipment such as motors. Generally, commercially available heat sinks have a large number of comb-shaped heat dissipation fins erected on a base made of a metal material with good thermal conductivity by extrusion processing or casting processing, or a plurality of plate-shaped heat dissipation fins are formed on a metal material using a digging tool. The heat dissipation fins in these heat sinks have a square heat dissipation surface.

[0003] Heat sinks with erected heat dissipation fins are used in various devices. From the required heat dissipation efficiency or the relationship between the arrangement and adjacent structures, as shown in Japanese Unexamined Patent Application Publication No. 2018-46199 (Patent Document 1), it is required that the surface shape of the heat dissipation fins be other than a square shape.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] As disclosed in the above Patent Document 1, forming the surface shape of the heat dissipation fins into a substantially triangular shape can be relatively easily manufactured, for example, when forming heat dissipation fins by subjecting a metal material with good thermal conductivity made of aluminum to extrusion processing or casting processing. However, in the case of extrusion processing or casting processing, since the interval between each heat dissipation fin becomes wide and the number of heat dissipation fins is small, inevitably the surface area becomes small and there is a problem that the heat dissipation efficiency decreases. On the other hand, as a method of forming heat dissipation fins, a process of forming thin plate-like heat dissipation fins by sequentially repeating a process of raising a metal plate on one surface of the metal material using a raising tool, such as skiving, to form a plurality of heat dissipation fins with a small interval, it is possible to obtain a high-efficiency radiator with a large surface area. However, forming heat dissipation fins with a substantially triangular diameter by skiving is technically difficult and is not currently in practical use.

[0006] As a solution to this, a method of forming thin plate-like heat dissipation fins at a small interval by skiving and then cutting the tips of the heat dissipation fins into a tapered shape with a cutting tool is also conceivable. However, when cutting the tips of thin plate-like heat dissipation fins, minute scraps are generated, and there is a problem that these scraps are inserted into the gaps between each heat dissipation fin. However, since the gaps between each heat dissipation fin are minute, it is extremely difficult to discharge the scraps once inserted. If these scraps remain in the gaps, there is a problem that they scatter inside electronic devices or industrial equipment during use, leading to serious accidents.

[0007] The problem to be solved by the present invention is to provide a radiator capable of connecting the scraps generated when cutting the tips of thin plate-like heat dissipation fins to prevent scattering.

Means for Solving the Problem

[0008] To solve the above problems, the invention according to claim 1 is a metal plate At each tip of a plurality of plate-shaped heat dissipation fins that are spaced apart and erected, the heights of one end side and the other end side in the width direction are made different Inclined surface formed Radiator formation method wherein, on the plane Lift them up with a lifting tool to separate and stand up the plurality of heat dissipation fins, and with the tip of the plurality of heat dissipation fins in a state where the cutting tool has a predetermined inclination angle the Repeatedly cut multiple times toward the other end side to incline it with respect to the plane of the metal plate the to form an inclined surface, and at the the stop position on the other end side of the heat dissipation fin, stop the cutting tool to form a connecting portion for connecting the base of the scrap, and move the cutting tool forward to connect the scrap the The gist is to cut it off from the connecting portion.

[0009] Further, in the invention according to claim 2, the connecting portion is formed by the cutting tool When cutting the heat dissipation fin, the other end side to a width at which the bases of the plurality of scraps generated therein are connected.

[0010] Furthermore, in the invention according to claim 3, the base of the scrap is formed flat by being separated by moving the connecting portion forward horizontally with respect to the plane of the metal plate is by moving forward. ri

Advantages of the Invention

[0011] According to the present invention, in the plurality of heat dissipation fins standing up from the plane of the metal plate, an inclined surface is formed at the upper end with the heights on one end side and the other end side in the width direction being different, and a connecting portion is formed between the other end side and the plane. Therefore, when the upper end of the heat dissipation fin is inclined by cutting, the base of the scrap generated can be temporarily connected. As a result, since the scraps are connected and become one lump, scattering is prevented, so the problem that the scraps are inserted into the gaps between the heat dissipation fins and an accident due to scattering occurs is solved. In addition, since the heat dissipation fins stand up vertically from the plane of the metal plate, when cutting to incline the upper end surface, the cutting tool abuts against the heat dissipation fin at a right angle. Therefore, it is difficult for the heat dissipation fin to bend or deform, and it is also difficult for the scrap to deform. Thus, it becomes possible to easily connect the base of the scrap.

[0012] ​ Further, according to the invention described in claim 2, by forming the inclined surface of the heat radiation fin by repeatedly cutting it a plurality of times with a cutting tool having a blade portion formed at the tip, the stress during cutting on the heat radiation fin can be reduced, and moreover, the base portion of the scrap can be connected to the connecting portion. Thereby, it is possible to prevent a part of the scrap from scattering and being inserted into the gap between the heat radiation fins.

[0013] Furthermore, according to the invention described in claim 3, since the base portions of the plurality of scraps are connected, the clumped scraps can be easily and neatly separated from the connecting portion, so that the connecting portion can be formed substantially flat.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0015] The radiator is a metal plate At each tip of a plurality of plate-shaped heat dissipation fins that are spaced apart and erected, the heights of one end side and the other end side in the width direction are made different Inclined surface formed Radiator formation method and is formed by raising the [portion of the metal plate] with a raising tool to separate and raise a plurality of the heat radiation fins, and cutting the tips of the plurality of heat radiation fins with a cutting tool in a state having a predetermined inclination angle plane the ​By repeatedly cutting a plurality of times toward the other end side, it is inclined with respect to the plane of the metal plate the to form an inclined surface, and at the stop position on the other end side of the heat dissipation fin the a connecting portion is formed to stop the cutting tool and connect the base of the scrap, and the cutting tool is moved forward to separate the connected scrap the from the connecting portion.

[0016] Hereinafter, the radiator according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a radiator 1, which is selected from a metal plate made of a metal material having a predetermined thermal conductivity, such as iron, stainless steel, aluminum, copper, etc., or an alloy mainly composed of these metals. On the upper surface of the metal plate 2, a plurality of heat dissipation fins 3 formed in a plate shape are erected at intervals. As shown in FIG. 3, the heat dissipation fin 3 stands perpendicular to the plane 2a of the metal plate 2. Note that the plurality of heat dissipation fins 3 are formed by using a digging tool to dig up the upper surface of the metal plate 2 to form the plate-shaped thin heat dissipation fins 3 by the forming method described later. Therefore, the heat dissipation fin 3 is formed in a recess 2b below the plane 2a of the metal plate 2.

[0017] Further, as shown in FIG. 2, the heat dissipation fin 3 has different heights from the plane 2a at one end side 3a and the other end side 3b in the width direction, and an inclined surface 3c is formed in which each tip is inclined with respect to the plane 2a of the metal plate 2. Furthermore, as shown in FIG. 2, a connecting portion 5 is formed between the other end side 3b of the heat dissipation fin 3 and the plane 2a to temporarily connect the base of the scrap 4 generated when the inclined surface 3c of the heat dissipation fin 3 is inclined by cutting. The width W of the connecting portion 5 is a dimension such that the connected scrap 4 can be separated when bent, and it varies depending on the thicknesses of the metal plate 2 and the heat dissipation fin 3, but is preferably approximately 0.01 mm to 1.0 mm. The connecting portion 5 can be separated by hand or cut by a cutting tool for cutting the inclined surface 3c. In any case, after separating the scrap 4, the connecting portion 5 is formed to be substantially flat.

[0018] Next, a method for forming the heat dissipation fins 3 standing perpendicular to the plane 2a of the metal plate 2 will be described with reference to FIG. 6. The heat dissipation fins 3 are formed by a digging tool 20 having a blade portion 20a at its tip. First, as shown in FIG. 6(A), the blade portion 20a of the digging tool 20 is positioned at a distance from the metal plate 2. In this state, a plurality of heat dissipation fins 3 that have been previously formed standing are present. Thereafter, as shown in FIG. 6(B), with the digging tool 20 set at a predetermined angle by the moving portion 21, it is moved in the direction indicated by the arrow. After the blade portion 20a comes into contact with the metal plate 2, it is moved forward while maintaining the inclination angle of the digging tool 20. The position where the blade portion 20a comes into contact with the metal plate 2 is determined by the plate thickness of the heat dissipation fin 3.

[0019] Thereafter, as shown in FIG. 6(C), the digging tool 20 is further moved forward until it reaches a predetermined depth, whereby heat dissipation fins 3 having a predetermined height and plate thickness are formed standing. In this state, the heat dissipation fins 3 are inclined. Thereafter, when the digging tool 20 is moved forward as shown in FIGS. 6(A) and (B) to form the next standing heat dissipation fin 3, as shown in FIG. 6(C), the lower end of the pressing plate 22 hanging down from the front of the moving portion 21 comes into contact with the tip side of the previously formed inclined heat dissipation fin 3. When moving forward integrally with the digging tool 20, the previously formed inclined heat dissipation fin 3 is pressed, and as shown in FIG. 6(C), the previously formed heat dissipation fin 3 is formed perpendicular to the plane of the metal plate 2.

[0020] Furthermore, in order to form the next standing heat dissipation fin 3, the moving portion 21 retracts the digging tool 20 to the origin position. Thereafter, by repeating the steps of FIGS. 6(A) to 6(D), a plurality of plate-shaped heat dissipation fins 3 perpendicular to the plane 2a of the metal plate 2 are formed standing at intervals on the upper surface of the metal plate 2. The intervals and the number of the plurality of heat dissipation fins 3 are appropriately determined by the desired radiator 1. Note that the method for vertically forming the heat dissipation fins 3 shown in FIG. 6 is an example, and other well-known methods may also be used.

[0021] As described above, the heat dissipation fin 3 formed perpendicular to the plane 2a of the metal plate 2 is formed in a quadrilateral shape. By the process shown in FIG. 5 for this heat dissipation fin 3, an inclined surface 3c with its tip inclined with respect to the plane 2a of the metal plate 2 is formed.

[0022] First, as shown in FIG. 5(A), the blade portion 10a formed at the tip of the cutting tool 10 is brought into contact with the tip of the heat dissipation fin 3 spaced apart from the other end side 3b of the heat dissipation fin 3. Then, as shown in FIG. 5(B), while maintaining a predetermined inclination angle, the cutting tool 10 is moved in the direction of the arrow and stopped at the stop position P, so that the tip of the heat dissipation fin 3 is inclined and cut, thereby forming small scraps 4. The stop position P is a position slightly spaced apart from the other end side 3b, and the dimension from the other end side 3b is such that the bases of the scraps 4 to be cut thereafter are connected to each other, and the portion between the other end side 3b and the stop position P is defined as the connecting portion 5. Thereby, the bases of the small scraps 4 are temporarily connected to the connecting portion 5.

[0023] Thereafter, the cutting tool 10 is retracted, and the blade portion 10a of the cutting tool 10 is brought into contact with a position where scraps 4 of a predetermined thickness can be obtained. Then, as shown in FIG. 5(C), while maintaining a predetermined inclination angle, the cutting tool 10 is moved in the direction of the arrow and stopped at the stop position P, so that a second scrap 4 formed by inclining and cutting the tip of the heat dissipation fin 3 is formed. The base of this second scrap 4 is connected to the base of the small scrap 4 formed earlier, and the bases of both are temporarily connected to the connecting portion 5. In this way, by repeating the advancement and retraction of the cutting tool 10 and inclining and cutting the tips of the heat dissipation fins 3 a plurality of times, as shown in FIG. 4, a mass of scraps 4 with their bases connected is connected to the other end side 3b of the heat dissipation fin 3. Thereafter, when the tip of the heat dissipation fin 3 is further cut, as shown in FIG. 5(D), the last scrap 4 in the form of a mass with its base connected is formed, and the base is temporarily connected to the connecting portion 5.

[0024] Thus, when cutting while inclining the tip of the heat dissipation fin 3 with the cutting tool 10, since the heat dissipation fin 3 is formed perpendicular to the plane 2a of the metal plate 2, even if the heat dissipation fin 3 is pressed by the cutting tool 10, it is applied in the surface direction, so that bending or deformation of the heat dissipation fin 3 is prevented.

[0025] In the state where the last scrap 4 is formed, inclined surfaces 3c are formed at the tips of the plurality of heat dissipation fins 3. Then, as indicated by the arrow in Fig. 5(E), by moving the cutting tool 10 forward horizontally with respect to the plane 2a of the metal plate 2, the connecting portion 5 of the scrap 4 in a state where the base portions are temporarily connected is separated. As a result, the connecting portion 5 is formed to be substantially flat. This connecting portion 5 becomes a horizontal plane when the cutting tool 10 moves forward horizontally with respect to the plane 2a of the metal plate 2, but becomes a slightly inclined plane when the cutting tool 10 moves forward in an inclined state. Also, the scrap 4 can be separated from the connecting portion 5 by an external pressure such as a hand, but in this case, it becomes a rough surface.

[0026] The present invention described above is not limited to these embodiments and can be variously modified without departing from the scope of the present invention. In the above-described embodiments, a plurality of heat dissipation fins are formed on the metal plate at equal pitches, but they may be formed at unequal intervals. Also, inclined surfaces may be formed on one end side or the other end side, or both sides of the heat dissipation fin.

Explanation of Reference Numerals

[0027] 1 Heat sink 2 Metal plate 2a Plane 3 Heat dissipation fin 3a One end side 3b The other end side 3c Inclined surface 4 Scrap 5 Connecting portion 10 Cutting tool

Claims

1. A method for forming a heat sink in which a plurality of plate-like heat sink fins are formed on a metal plate at intervals and have an inclined surface at each tip, the inclined surface having a different height on one end side and the other end side in the width direction, comprising: The flat surface of the metal plate is excavated with a digging tool to form a plurality of the heat dissipation fins in an upright manner at a distance from each other; a cutting tool is used to cut the tips of the heat dissipation fins toward the other end side at a predetermined inclination angle, thereby forming the inclined surface inclined with respect to the plane of the metal plate; stopping the cutting tool at a stop position on the other end side of the heat dissipation fin to form a connecting portion that connects the base portion of the scrap; a cutting tool being moved forward to separate the connected scrap from the connected portion.

2. The method for forming a heat sink according to claim 1 , wherein the connecting portion is formed to a width that allows base portions of the plurality of scraps generated on the other end side when the heat sink fin is cut with the cutting tool to be connected to each other.

3. The method for forming a heat sink according to claim 1 , wherein the base of the scrap is cut off and formed flat by advancing the cutting tool horizontally to the plane of the metal plate.

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