JPS62142996A - Manufacture of radiator - Google Patents

Abstract

PURPOSE:To positively fix a heating unit such as a semiconductor element or the like and prevent burrs from occurring by providing cut-away portions for the relief of screw leading ends at positions on the side of fin forming parts of a radiator material across the full length in the longitudinal direction of the radiator material. CONSTITUTION:On a radiator material 10 made of an aluminum extrusion mold material, a hollow portion 15 for forming a cut-away portion for the relief of a screw tip end of a tapping screw is provided along an interface surface L between a base forming part 11 and a fin forming part 12 and at a position on the side of the fin forming part 12, across the full length of in the longitudinal direction of the radiator material 10. Then, the fin forming part 12 of the radiator material 10 is thinly slotted and raised, to form tongue- shaped fins 2 having cut-away portions 5 for the relief of screw tip ends. When tapping screws 4 are screwed into lower holes 5, the tip ends of the tapping screws 4 can be relieved into the cut-away portions 5, and hence the heating units can be positively secured. Further, cut away portions 5 of the tongue- shaped fins 2 do not utterly produce burrs upon the formation thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method of manufacturing a heat sink used for cooling semiconductor devices and heat collector circuits (ICs).

Conventional technology Conventionally, semiconductor elements and heat collecting circuits used in electronics-related products such as audio amplifiers and OA equipment have been made of aluminum (including aluminum alloys) IjIIi heating devices. For example, as shown in FIG. 5, a heat generating object (23) such as a semiconductor element,
It is fixed to one side of the plate-shaped base (21) with a tapping screw (24), and the tongue-shaped fin (2) is fixed to the other side of the base (21).
2) was provided in a cut and raised shape. However, in this case, as shown on the left side of FIG. 6, the screw hole (26) of the self-tapping screw (24) should be located between the tongue-like fins (22); If this is located, this will become an obstruction and the self-tapping screw (24) cannot be screwed in sufficiently, and the head (24a) of the screw (24) will float above the heat generating element (23), causing the heat generating element (23) to be attached to the base. (21) There was a problem that it could not be firmly fixed.

As shown in FIG. 7, such a conventional heatsink is made of a heatsink material (30) made of an aluminum extruded material, which consists of a base forming part (31) and a fin forming part (32) on one side of the base forming part (31). It is manufactured by cutting and raising the fin-forming portion (32) thinly to form tongue-like fins (22) as shown in FIGS. 8 and 9. As shown in the figure, a pilot hole (25) was drilled in the plate-shaped base (21) of this radiator, and a tapping screw (24) was screwed into the pilot hole (26). At the same time, a small notch (25) is formed at the base of the tongue-like fin (22), and since the depth of this notch (25) is very shallow, for example, 1 to 2 mm, the tapping screw (24) cannot be opened. There was a problem in that the tip hit the base of the fin (22) and the heating element (23) could not be firmly fixed. Also, the pilot hole (
26), it is conceivable to use a drill to make a large notch (25) at the base of the fin (22), but in this case, because the tongue-like fin (22) is thin, so-called burrs are likely to occur. If the aluminum debris generated from the heat sink gets into various equipment such as audio amplifiers, it can cause trouble with the equipment, and when the heat sink is roughly inserted into the audio equipment, such debris may cause damage to the operator's hands. There was a problem that there was a risk of cutting.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems, to be able to reliably fix heat-generating objects such as semiconductor elements to a plate-like base, and to avoid the occurrence of troubles in various equipment caused by aluminum fragments without causing cracks. It is an object of the present invention to provide a method for manufacturing a heat radiator that can prevent such debris from occurring, eliminate the risk of workers cutting their hands due to such debris, and reduce the weight and cost of the radiator. .

Composition of the Invention In order to achieve the above-mentioned object, the present invention includes a plate-shaped base, on one side of which a heat generating element such as a semiconductor element is fixed with a screw, and a tongue-like fin cut and raised on at least the opposite side of the base. A method for manufacturing a radiator, wherein a radiator material made of an aluminum extruded material comprising a base forming part and a fin forming part is provided with a fin forming part along the interface between the base forming part and the fin forming part. A hollow part for forming a notch for relieving the tip of the screw having a width larger than the diameter of the screw and a required depth at the side position is provided along the entire length of the radiator material, and the fin forming part of the radiator material is provided. The gist of the present invention is a method of manufacturing a heat radiator, which is characterized in that a tongue-like fin is formed by cutting and raising the material into a thin layer to form a tongue-like fin having a notch for releasing the tip of a screw.

Example Next, embodiments of the invention will be described with reference to the drawings.

The method according to the invention, as shown in FIGS. 1 and 2,
A heat dissipation device in which a heating element (3) such as a semiconductor element is fixed to one side of a plate-shaped base (1) with a self-tapping screw (4), and a tongue-shaped fin (2) is cut and raised on the opposite side of the base (1). As shown in FIG. 3, a method for manufacturing a vessel includes: a radiator material (10) made of an aluminum extruded material consisting of a base forming part (11) and a fin forming part (12);
Base forming part (11) and fin forming part (12)
Along the interface (L) with the fin forming part (12)
A hollow part (15) for forming a notch for relieving the tip of a screw having a width (X) larger than the diameter of the self-tapping screw (4) and a required depth (Y) at the side position is attached to the length of the radiator material (10). The heatsink element vJ (10
) is thinly cut and raised to form a tongue-shaped fin (2) having a notch (5) for releasing the tip of the screw, as shown in Fig. 4 and Figs. 1 and 2. It is something that forms.

In order to attach a heating element (3) such as a semiconductor element to the heat sink obtained by the method of the present invention, as shown in FIG. Missing (
Drill a pilot hole (6) to correspond to the plate base (
What is necessary is to press the heating element (3) against one side of 1) and screw the tapping screw (4) for installing the heating element into the prepared hole (5). Then, cut out the tip of the tapping screw (4) (
5), it is possible to secure a sufficient screw-in length of the screw (4). In addition, the notch (5) of each tongue-shaped fin (2) is located in the hollow part (
15), there is no formation of paris during its formation.

Note that the width (X) of the hollow portion (15) provided in the radiator material (10) is larger than the diameter of the self-tapping screw (4) because the tip of the self-tapping screw (4) is screwed into it. The depth of the hollow portion (15) is also related to the cutting angle of the blade of the cutting machine when cutting and raising the tongue-shaped fin (2).
In short, when cutting and raising the tongue-shaped fins (2) from the fin-forming part (12) of the material (10), each fin (2)
It is sufficient that a notch (5) deep enough to allow the tip of the tapping screw (4) to escape is formed at the base of the screw.

J3, it is desirable that the hollow part (15) of the radiator material (10) be provided along the interface (L) between the base forming part (11) and the fin forming part (12). , the hollow part (15) is connected to the base forming part (
The notch (5) may be provided so as to protrude somewhat on the side (11), and in this case, even if the blade is inserted too far into the base forming part (11) when cutting and raising the fin (2), the notch (5) will be effective. can be formed into Therefore, in this specification, when the hollow part (15) is along the boundary surface (L), it means that the hollow part (15) is along the boundary surface (L).
15) not only completely along the boundary surface (L), but also includes cases where it extends slightly toward the base forming portion (11) from the boundary surface (L).

In each of the above embodiments, a self-tapping screw (4) is used, but it is of course possible to use a machine screw.

Furthermore, in each of the above embodiments, the tongue-like fin (2) is provided on one side of the plate-shaped base (1) on which the heat generating element (3) is not attached, but the tongue-like fin (2) is provided on the side on which the heat generating element (3) is attached. However, in some cases, tongue-like fins (2) are provided in the portions other than the internal parts where the heating element (3) is fixed.

Effects of the Invention The method according to the present invention, as described above, has a plate-like base (1
) A heating element (3) such as a semiconductor element is fixed to one side of the base (1) with a screw (4), and a tongue-shaped fin (2) is provided in a cut-and-raised shape at least on the opposite side of the base (1). The base forming part (11) and the fin forming part (12) are attached to the radiator material (10) made of extruded aluminum material, which consists of the base forming part (11) and the fin forming part (12). A hollow hole for forming a notch for relieving the tip of the screw having a width (X) larger than the diameter of the screw (4) and a required depth (Y) along the boundary surface (L) and at a position on the side of the fin forming part (12). Part (15) is heatsink material (1
A tongue-shaped fin (2) is provided over the entire length in the length direction of the radiator material (10) and has a notch (5) for releasing the tip of the screw by thinly cutting and raising the fin-forming part (12) of the radiator material (10). ), and a screw tip relief notch (5) is provided at the base of the tongue-shaped fin (2) on the opposite side of the plate-shaped base (1) to the mounting surface of the heat-generating object such as a semiconductor element. Therefore, the heating element mounting screw (4) can be fully screwed in, and the heating element (3) such as a semiconductor element can be attached to the plate base (1).
) can be securely fixed. Moreover, there is a notch (5)
Since it is formed from the hollow part (1゛5) of the heat sink material (10), it does not cause any cracks and prevents troubles in various equipment caused by aluminum fragments. There is no risk of workers cutting their hands due to debris.

Furthermore, a hollow part (15) is provided in the radiator material (10) ().
This has the effect of making the radiator lighter and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged horizontal longitudinal cross-sectional view of a heat sink manufactured by the method of the present invention, showing a state in which a heat generating element such as a semiconductor element is attached. Fig. 2 is a partially enlarged sectional view taken along the line II-II in Fig. 1, Fig. 3 is a front view of the heatsink material used in the method of the present invention, and Fig. 4 [heatsink manufactured by the method of the present invention]. FIG. 3 is a partially cutaway front view. FIG. 5 is a perspective view of a conventional heat radiator, showing the state before a heat generating element is attached. FIG. 6 is a partially enlarged plan view of a conventional heat radiator, showing a state in which a heat generating element is attached. FIG. 7 is a front view of a conventional heat sink material, FIG. 8 is a partially enlarged cross-sectional view of a conventional heat sink, and FIG. 9 is a partially cutaway front view of a conventional heat sink. (1)... Plate-shaped base, (2)... Tongue-shaped fin, (
3)... Heat-generating object such as a semiconductor element, (4)... Tapping screw, (5)... Screw tip release notch, (10)
... Heatsink material, (11) ... Base forming part,
(12)... Fin forming part, (15)... Hollow part, (1... Boundary surface. Applicant for the above patents: Showa Aluminum Co., Ltd. Figure 8 Figure 7 Figure 8

Claims (1)

[Claims] A heat dissipating device in which a heating element (3) such as a semiconductor element is fixed to one side of a plate-shaped base (1) with a screw (4), and a tongue-shaped fin (2) is provided in a cut-and-raised shape on at least the opposite side of the base (1). A method for manufacturing a vessel, the base forming portion (11
) and a fin-forming part (12), the base-forming part (
11) and the fin-forming part (12) along the interface (L) and at a position on the fin-forming part (12) side, a width (X) larger than the diameter of the screw (4) and a required depth (Y). A hollow part (15) for forming a notch for relieving the tip of the screw is provided along the entire length of the radiator material (10), and a fin forming part (12) of the radiator material (10) is provided.
A method for manufacturing a heat radiator, which comprises cutting and raising the material thinly to form a tongue-shaped fin (2) having a screw tip relief notch (5).