JP3668304B2 - Manufacturing method of heat sink - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method of manufacturing a heat sink having the same or different materials for the mounting module and the plate fin, and particularly having a thin plate fin and excellent heat dissipation performance.
[0002]
[Prior art]
In an LSI (High Density Integrated Circuit) such as a CPU or MPU, in particular, the thermal performance affects the reliability or life of the component, and the temperature rise is greatly affected by the life and high speed. As the LSI becomes more densely integrated and faster, the heat generated from the LSI increases, and the heat dissipation performance of the conventional technology is limited. The current situation is that it is not possible, and there are still LSIs that cannot keep up with heat dissipation. Therefore, there are many problems such as securing a space for mounting the fans close to each other, devastating damage to the computer due to neglect of the fan failure in the intricate part after assembly, and requiring extensive work to replace other fans. there were.
[0003]
In addition, there is an air-cooled structure as the heat sink with pin fins, which can individually dissipate the LSI parts such as the CPU and MPU, and unlike the liquid-cooled structure, there is no liquid leakage or failure, It has a simple structure and is extremely safe and reliable. Such a heat sink with pin fins has a problem of low heat dissipation performance. In order to solve this problem and improve the heat dissipation performance, specifically, it has been researched that it is better to reduce the diameter of a large number of pin fins, and this is an experimentally recognized fact.
[0004]
Also in heat pipes, a heat sink for cooling is required, and in this case, the directionality may be constant. Therefore, a heat sink having a large number of plate fins arranged in parallel at predetermined intervals has been developed. However, in this case as well, there is a problem of how to produce a good heat sink by eliminating the thin plate fins and pinholes.
[0005]
[Problems to be solved by the invention]
As described above, with the current technology, it is difficult to orderly manufacture the plate fins by die casting or the like with the thickness of the plate fin being 1 mm or less. That is, when the plate fin thickness is reduced, there is a drawback that even if the pressure is increased and filled in the slit-shaped hole provided in the mold, the molten metal such as aluminum does not sufficiently rotate and the plate fin cannot be formed orderly. there were.
[0006]
[Means for Solving the Problems]
Therefore, as a result of intensive studies and researches, the inventor has devised a slit-like thin hole having a predetermined hole length and a predetermined hole depth with a slight hole width. In the thin hole portion of the mold formed with a large number of parts in parallel at predetermined intervals, the dimension corresponding to the hole width, hole length and hole depth of the thin hole portion is such that there is almost no gap. was formed as a slightly smaller shape and size, with the thickness of the thin, predetermined plate length, only each of the upper end is slightly height of the plate fins by nonferrous metal such as aluminum having a predetermined plate height insert to expose, it was loaded into the flask筺the body, and a non-ferrous metal melt such as aluminum filled into the template frame within the housing, is embedded in each of the upper end of the plate fins in the molten metal melt The non-ferrous metal that has been forged and the molten forged material is cured and the molten metal is cured. And a heat sink manufacturing method characterized by being manufactured by planting a large number of the plate fins on the mounting module, thereby achieving extremely excellent heat dissipation performance and solving the above problems Is.
[0007]
Embodiment
Hereinafter, an embodiment of the first manufacturing method of the present invention will be described with reference to FIGS. First, components according to the manufacturing method and products by the manufacturing method will be described. As shown in FIG. 6, the heat sink A for LSI or heat pipe of the present invention includes a plate-shaped mounting module 1 made of non-ferrous metal C having excellent thermal conductivity, such as aluminum, and the mounting module 1 on the upper surface. It is composed of a plurality of plate fins 2, 2,... Made of the same non-ferrous metal C as the material.
[0008]
The heat sink A has a thin plate thickness t, a predetermined plate length s, a predetermined plate height h, plate fins 2, 2,... With respect to the mounting module 1 as a square plate piece. Many Ps are planted in parallel.
[0009]
Even if the plate fins 2 and 2 are provided too densely, the flow resistance of the flow path between the fins increases, and the fins do not work effectively. For this reason, when the air flow velocity is small, it is dangerous to use the plate fins 2 so as to be overcrowded. Also, if the fin installation interval is too coarse, the heat transfer area is small and the heat dissipation performance as a heat sink is reduced, so the appropriate plate fins 2 determined from the harmony of the increase in flow resistance and the rate of increase in the heat transfer area It is necessary to determine the distance between the two.
[0010]
Further, a plurality of slit-like thin hole portions 10 having a predetermined hole length S, a predetermined hole length S, and a predetermined hole depth H are provided at predetermined intervals to form a mold B [ FIG. 1 (A), (B) and FIG. 2 (A)]. In order to correspond to the hole width T, hole length S, and hole depth H of the thin hole portion 10, the plate fin has a thin plate thickness t, a predetermined plate length s, and a predetermined plate height h. 2 is formed. That is, it is formed as a slightly smaller shape and size with a hole width T of the thin hole portion 10, a predetermined hole length S and a predetermined hole depth H so that there is almost no gap.
[0011]
In order to specifically manufacture the mold B, as shown in FIG. 1C, a rectangular plate piece B ₁ having a thickness P ′ (= P) of the spacing plate and a thickness T ′ ( = T), the plate pieces B ₂ having the height H ′ (= H), the length S ′ (= S) and the U-shaped notches are alternately stacked to form a thin film. The hole width T, the hole length S, and the hole depth H of the shaped hole 10 are set. As a result, a highly accurate mold B can be obtained.
[0012]
Reference numeral 11 denotes a cast frame housing, and as shown in FIGS. 3 and 4, the mold B is loaded on the bottom of the inside, and a hydraulic device is provided above the cast frame housing 11. A pressing plate 15 is provided so as to be pressurized.
[0013]
Next, an embodiment of the first manufacturing method of the present invention will be described. First, the plate fins 2 and 2 are respectively inserted into the many thin hole portions 10, 10,. [Refer to FIG. 2B]. At this time, the plate fins 2 are set so that the upper ends of the plate fins 2 are exposed by a slight height h ′ from the upper part of the thin hole 10 (see FIG. 2C). In this way, the plate fins 2, 2,... Are inserted into the whole thin hole portions 10, 10,.
[0014]
Then, a mold B provided with such plate fins 2 is loaded into the inside of the casting frame casing 11, and then filled with a molten metal C ₀ of a non-ferrous metal C such as aluminum (see FIG. 3A), It fills so that the upper end of the said plate fin 2,2, ... may be embedded [refer FIG.3 (B)]. Then, the molten metal C ₀ is beaten with the pressing plate 15 by a hydraulic device (see FIGS. 4A and 4B). In this specification, the pressing due to such an impact load is a state in which the molten metal is forged, and is referred to as molten metal forging. For this reason, the molten metal C ₀ is preferably in a state of high viscosity. In such molten metal forging, the metal structure of the molten metal C ₀ becomes denser and the hardness increases.
[0015]
Thereafter, the molten metal C ₀ is cured. Since the plate fin 2 and the molten metal C ₀ of the non-ferrous metal C are the same material with the non-ferrous metal C in the cured state, the position where the upper end of the plate fin 2 is exposed from the mold B is , integrated with and dissolved at the melting temperature of the molten metal C _0. Thus, after the molten metal C ₀ is hardened, the hardened non-ferrous metal C and the plate fins 2, 2,... Having a predetermined thickness are taken out from the casting frame housing 11 and taken out from the mold B (see FIG. 5). ). Then, the non-ferrous metal C can be formed as the mounting module 1, and a large number of the plate fins 2, 2,... Can be integrally planted on the mounting module 1 (see the upper side in FIG. 5). Accordingly, the heat sink A made of the same metal material can be manufactured for the plate fin 2 and the mounting module 1 (see FIG. 6).
[0016]
Next, the main feature of the second manufacturing method is that the pressing plate 15 by the hydraulic device is not provided and the molten metal C ₀ is not pressed. The other manufacturing method is the same as the first manufacturing method. Therefore, until 1 to 3, are identical to the FIG. 5, in the state of FIG. 3 (B), the one in which hardening the molten metal C ₀ to curing. In such a method, pinholes or the like may occur in the mounting module 1, but the plate fins 2 are manufactured separately in advance and have no pinholes at all and can be made very orderly.
[0017]
Next, in the manufacturing method of the third embodiment, a plate-like mounting module 1 made of a non-ferrous metal C such as aluminum and a plate fin 2 made of metal such as copper of a different material of the mounting module 1 on the upper surface. 2 is a manufacturing method of the heat sink A composed of a plurality of planted. In this case, the first is the production method is substantially the same, the upper end of the plate fin 2 is not dissolved in the melt C _0, in which the plate fins 2 and the mounting module 1 is configured as a separate member Yes (see FIGS. 7 and 8). In this case, in particular, the material of the plate fins 2 can increase the heat dissipation performance.
[0018]
The fourth manufacturing method is the same as that of the third embodiment, and is the same as that of the second manufacturing method. This description is omitted.
[0019]
Another embodiment of the heat sink A is a case where the shape and structure of the plate fin 2 are changed. 9, the plate fins 2, 2,... Are appropriately provided with opening holes 3, 3,... So that the positions of the opening holes 3, 3,. . By doing so, the opening holes 3, 3,... Are eccentric from the direction orthogonal to the surface of the plate fin 2, so that the wind from the orthogonal direction is also It can distribute | circulate through the opening hole 3, and can be made into a turbulent flow state. That is, in the plate fin 2, air flows only in the direction orthogonal to the parallel direction, and the directionality is constant, but in the case of FIG. 9, this directionality can be multidirectional. .
[0020]
As another embodiment of the other heat sink A, a projection 4 such as a concave portion or a convex portion is appropriately formed on the plate fin 2. That is, as shown in FIG. 10, a large number of protrusions 4, 4,... The height of the protrusion 4 in this case is about 0.1 mm to about 0.3 mm when the plate fin 2 is about 0.4 mm, and the molten metal C ₀ is other than the molten forging. The thin hole portion 10 is configured not to enter.
[0021]
Further, as shown in FIGS. 11A and 11B, the protrusion 4 having a height larger than the plate thickness is formed on the plate fin 2, and in this case, Lateral ribs 5 are formed laterally near the lower side of the plate fins 2. In particular, as shown in FIG. 11C, the lateral rib 5 is configured to close the thin hole portion 10 of the mold B during manufacture, and the molten metal C ₀ is placed in the thin hole portion 10. It is configured not to enter.
[0022]
【Example】
An example is a case of a product, but it is made of an aluminum alloy having a size of 63.5 cm square and a thickness of 1 mm to be a mounting module 1. The mounting module 1 is integrally formed with a thickness of 0.4 mm. A plurality of plate fins 2, 2,... Having a plate length of 63.5 cm and a height of 49 mm are implanted. Specifically, the plate fins 2 are left at 0.75 mm in both directions of the mounting module 1, and a large number of 45 plates are formed with a spacing of 1 mm. Such a heat sink A is manufactured in the embodiment according to the first manufacturing method described above.
[0023]
【The invention's effect】
According to the first aspect of the present invention, a mold in which a large number of slit-like thin hole portions 10 having a predetermined hole length S and a predetermined hole depth H are formed at a predetermined interval with a small hole width T. A slightly smaller shape and size corresponding to the hole width T, hole length S, and hole depth H of the thin hole 10 and having almost no gap in the thin hole 10 of B. The upper end of each of the plate fins 2 made of non-ferrous metal C such as aluminum having a thin plate thickness t and a predetermined plate length s and a predetermined plate height h is exposed to a slight height. These are inserted into the casing 11 and filled with a molten metal C ₀ of non-ferrous metal C such as aluminum, and the upper ends of the plate fins 2 are buried in the molten metal C ₀ . It is allowed to melt forged, by curing a material obtained by solution hot forging, the non-ferrous metals C the molten metal C ₀ is cured is collected Since the module 1 is a heat sink manufacturing method in which a large number of the plate fins 2 are implanted and manufactured in the mounting module 1, even if the mounting module 1 and the plate fin 2 are the same or different, the plate The fins 2 are manufactured in advance, and the plate fins 2 are not molded at the time of manufacture. Therefore, the fins 2 are greatly different from those performed by applying pressure by conventional die casting. Can be made orderly without any pinholes. Furthermore, the plate fins 2 can be made of a thin material, in particular, because they are formed in advance.
[0024]
In the invention of claim 1 as described above, since the plate fins 2 are molded in advance, only the molten metal C ₀ filled in the corresponding portion of the mounting module 1 is cured, and the molten metal C is filled up to a thin portion. It does not require time until ₀ enters, and mass production is possible. Even if the plate fin 2 is formed with a projection 4 having a relatively low unevenness, since the projection 4 is pre-formed, it is integrated by drawing by die casting. There is an advantage that it can be molded satisfactorily, unlike the case where
[0025]
Further, in the invention of claim 1, since the molten metal is forged before curing, the metal structure of the molten metal C ₀ at one location of the mounting module becomes denser, and the heat dissipation performance can be improved as a heat sink. , And the hardness increases and can be strengthened.
[0026]
In the invention of claim 2, in claim 1, by which the said plate fins 2 and the mounting module 1 and the formed by the same material heat sink manufacturing method, the heat sink A produced is, because of the same material, the molten metal C ₀ The plate fin 2 is melted and integrated to be strong, and the manufacturing cost can be reduced.
[0027]
In the invention of claim 3, in claim 1, since the plate fin 2 and the mounting module 1 are made of a heat sink manufacturing method using different materials, the manufactured plate fin 2 of the heat sink A has more heat dissipation performance. There is an advantage that can be made excellent.
[0028]
According to a fourth aspect of the present invention, the method of manufacturing a heat sink according to the first aspect in which an appropriate opening hole 3 is formed in the plate fin 2 is different from the method of manufacturing the heat sink by pulling out the plate. Since the fins 2 are preliminarily formed, there is an advantage that even if such opening holes 3 exist in the middle, the fins 2 can be formed in an orderly manner. In addition, in the product, air can flow only in a direction perpendicular to the direction in which the plate fins 2 are arranged in parallel to the direction different from the direction through the opening hole 3 to increase heat dissipation performance. sell.
[0029]
According to a fifth aspect of the present invention, in the first aspect of the present invention, the heat sink manufacturing method is obtained by forming the protrusion 4 on the plate fin 2 within a range where the molten metal C ₀ does not enter the thin hole 10. In particular, unlike the method of manufacturing by drawing, the plate fin 2 has an advantage that it can be suitably manufactured because it is pre-shaped. Moreover, as the product, the air collides with the protrusions 4 even when the air flows in the plate surface direction of the plate fins 2 to generate turbulent flow, thereby increasing the heat radiation performance.
[Brief description of the drawings]
1A is a perspective view of a mold, FIG. 1B is an enlarged cross-sectional view of the main part of FIG. 1C, and FIG. 2C is an exploded perspective view of components according to an embodiment for manufacturing the mold; (A) is a cross-sectional view of the mold (B) is a cross-sectional view of a state where a pre-manufactured plate fin is inserted into a thin hole portion of the mold (C) is an enlarged view of a main part after the plate fin is implanted Sectional view [Fig. 3] (A) shows a state in which a mold with a plate fin is inserted into the frame body and a molten metal of non-ferrous metal such as aluminum is filled from above (B) shows a plate in the frame body Sectional view in which a mold with fins is inserted and filling of a non-ferrous metal such as aluminum is completed from above. [FIG. 4] (A) is a sectional view with a pressing plate as a pressing plate against the molten metal (B) is a molten metal. FIG. 5 is a cross-sectional view of the pressing plate that has been pressed against the mounting plate. FIG. 6 is a sectional view of the heat sink manufactured. FIG. 7 is a perspective view of another embodiment of the heat sink in which the plate fin and the mounting module are made of non-ferrous metals. FIG. 9 is a perspective view of another embodiment of the heat sink. FIG. 10A is a perspective view of the main portion of still another embodiment of the heat sink. FIG. 11A is a perspective view of a main part of still another embodiment of the plate fin. FIG. 11B is an enlarged cross-sectional view of the main part in which the plate fin of FIG. ) Is a cross-sectional view of the process of manufacturing (B).
1 ... mounting module 2 ... plate fins 3 ... openings 10 ... Usukatachiana 11 ... molding flask housing 15 ... pressing plate B ... die C ... ferrous metals C ₀ ... melt

Claims (5)

In the thin hole portion of the mold, a plurality of slit-like thin hole portions having a small hole width, a predetermined hole length, and a predetermined hole depth are formed in parallel at predetermined intervals. Predetermined plate length with a thin plate thickness that is formed as a slightly smaller shape and size that has almost no gaps corresponding to the hole width, hole length, and hole depth of the shaped hole. , it was inserted so that each upper end of the plate fins by nonferrous metal such as aluminum of predetermined plate height is exposed by the height of the slightly loaded them into the flask筺the body, into the template frame within the enclosure Filled with a molten non-ferrous metal such as aluminum, the upper end of each of the plate fins is embedded in the molten metal and forged, and the molten forged material is cured, and the molten non-ferrous metal is a mounting module, A large number of the plate fins are implanted in the mounting module. Preparation of the heat sink, characterized in that.   2. The method of manufacturing a heat sink according to claim 1, wherein the plate fin and the mounting module are made of the same material.   2. The method of manufacturing a heat sink according to claim 1, wherein the plate fin and the mounting module are made of different materials.   2. The method of manufacturing a heat sink according to claim 1, wherein an appropriate opening hole is formed in the plate fin.   2. The method of manufacturing a heat sink according to claim 1, wherein a protrusion is formed on the plate fin within a range in which molten metal does not enter the thin hole.

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