JPH01266922A - Metallic member for radiation or the like and its manufacture - Google Patents

Abstract

PURPOSE:To reduce the cost and to prevent damages from breaking out by press-forming a preformed stock between an upper and a lower die having forming pins and protrusion forming holes and removing a product with pressurizing medium after forming is finished. CONSTITUTION:The upper die 11 having many guide forming pins and the lower die 12 forming guide recesses 14 are provided, a preliminary plastic forming is performed to a stock W to form a preliminary stock W'. The preliminary stock W' is set on another pressing machine to press-form a product by the upper die 11 having a plurality of hollow forming pins 16 and the lower die 12 having a plurality of pin-shaped protrusion forming holes 17. Then, a pressure chamber 25 is filled with working oil L and pressed by a piston 26 to remove a product or a metallic stock 1a. Since working is executed by a aeries of press-forming only and the product 1a is removed through pressure oil L, the cost of the product is reduced and damages can be prevented from breaking out in the product 1a.

Description

[Detailed description of the invention] (Object of the invention) <Industrial application field> The present invention is applicable to large-scale integrated circuits (LSI), RC, FE, etc.
The present invention can be applied as a technology for manufacturing metal parts, etc. that support electronic components such as T while dissipating heat, and relates to the product itself and its manufacturing method.

<Background of the Invention> As a heat dissipation component for this type of LSI and other electronic components, one in which a large number of heat dissipation fins or pin-like protrusions are formed on a metal support is applied. These protrusions are intended to increase the heat dissipation area.

By the way, conventionally, many of these types of heat dissipating parts have been molded, and extrusion molding, which is more efficient in production, has not been used until recently. The reason for this is, for example, when making pin-shaped cooling protrusions, the material is pressed into a mold with many molding holes. This was because the molding holes were deeply wedged into each other, making it extremely difficult to remove them. Therefore, in order to solve these problems, the present applicant has filed Japanese Patent Application No. 182888/1988 entitled "Metal Products for Heat Dissipation, Method of Manufacturing the Same, and Apparatus for Manufacturing the Same"
Applications have been filed. By incorporating hydraulic operation as a mechanism for removing the product from the mold, it is possible to apply equal pressure to each pin-shaped protrusion, so that the product is pushed back from the mold evenly without rolling. This made it possible to use extrusion molding, which has excellent production efficiency, in the field of producing this type of heat dissipation parts.

However, in recent years, large-scale integrated circuits (LSI)
The development of electronic components such as these is remarkable, and their performance is improving day by day. For example, as the degree of integration of large-scale integrated circuits (LSIs) increases, the amount of heat generated also increases, and there is a desire to develop heat dissipation components with even better heat dissipation effects. Therefore, heat pipes are attracting attention today. In this type of pipe, a refrigerant is sealed inside a pipe, and the refrigerant is caused to flow using capillary phenomenon, thereby increasing the heat dissipation effect. However, this heat pipe must be used with a heat dissipation fin attached to one end or used in conjunction with other mounting members, making its structure complicated, and the outer shell member is formed by molding. Coupled with the current situation, the cost is higher than other heat dissipation components.

Technical matters for which development was attempted> The present invention was made in view of this background, and
A metal product for heat dissipation, etc., which is an intermediate material necessary to provide a heat dissipation effect equivalent to that obtained by a heat pipe, as seen in Japanese Patent Application No. 62-182888 developed by the present applicant, for heat dissipation, etc. This is an attempt to develop a technology for manufacturing metal parts.

(Structure of the Invention) <Means for Achieving the Object> That is, the metal member for heat dissipation, etc. according to the present invention, includes forming a pin-shaped protrusion on at least one surface of a base member having an appropriate shape by press molding, Furthermore, this pin-like projection is characterized in that a hollow portion is provided inside the pin-like projection and the pin-like projection is formed into a tubular shape, thereby achieving the above-mentioned object.

In addition, the method of manufacturing a metal member for heat dissipation according to the present invention includes an upper mold having a large number of guide molding pins formed on a material, and a plurality of guide molding recesses formed at positions opposite to the guide molding pins. The material is molded into a preliminary shape by applying pressure and plastically deforming the material with a lower mold provided therein, and then an upper mold comprising a hollow molding pin and a pin in a position opposite to the hollow molding pin. Further pressure is applied by the lower mold having shaped protrusion forming holes to form the final shape, and after the molding is completed, a pressurizing medium is supplied from below the lower mold to apply an average removal force to the product. It is characterized by the following, and aims to achieve the above-mentioned purpose.

<Examples> The present invention will be specifically described below based on illustrated examples. In the following description, first, a metal member for heat dissipation, which is the first invention of the present application, will be explained, and then a manufacturing method thereof, which is the second invention, will be explained. Reference numeral 1 denotes a heat dissipation component as a final product to which the present invention is applied,
The metal member 1a of the present invention is commonly used as the main body member. The metal member la is made of, for example, a light alloy material mainly made of aluminum or the like. In this embodiment, as an example, a substantially rectangular base member 2 has a shape in which a large number of pin-like protrusions 3 are formed on one surface thereof. The pin-shaped protrusion 3 is formed by extruding the same member as the base member 2 and formed into a tubular shape with a hollow portion 4 provided therein.

More specifically, this hollow part 4 has an opening 5 on the base material part 2 side, and is formed extending from the base material part 2 side to the vicinity of the tip of the pin-shaped projection 3. The dimensions of this base material range, for example, from a few square inches to several hundred inches square, and can be formed in a variety of other dimensions, and of course, it may have the shape of the final product from the beginning, Alternatively, in order to make a final product, an appropriate method can be taken, such as cutting this product into parts and cutting them into desired sizes. Incidentally, the thickness of the base material portion 2 can also be selected as appropriate, and can be determined by the number I11~
A thickness of approximately several l Q u+ can be set arbitrarily.

The pin-shaped protrusion 3 also has a diameter of 0. Several mm to several liters
Q
It is possible to form something of the order of m++. The point is that it can be selectively manufactured into a suitable shape depending on the purpose. Also, pin-shaped protrusion 3
The cross-sectional shape of the hollow portion 4 in FIG. 7(a) can have various shapes as shown in FIG. b) has a cross section in which the four sides are mutually curved inward and each vertex 4b exhibits a capillary effect, Fig. 7 (C)
For example, a cross section having a groove portion 4c having a capillary effect in a part of a circular hole can be applied.

Next, a method of manufacturing the metal member 1a having such a configuration will be explained. First, the present invention is based on the premise that extrusion molding is mainly used to obtain a desired shape. Therefore, in carrying out the present invention, the same mold 10 as used in ordinary extrusion molding is required. As is well known, this mold IO is a press die that applies pressure to the material W (in the following explanation, this press die is referred to as an upper die 11, considering that this press die is usually arranged at the upper side of this type of extrusion molding machine). , and a lower die 12 located below with the material W in between.

In the present invention, the shapes of the upper mold 11 and the lower mold 12 are devised, and the upper mold 11 and the lower mold 12, each having a separate shape, are divided into parts at a time for the material W. Metal member 1 which is a finished product after pressing using and molding
When removing a from these molds 10, the lower mold 12
The feature is that hydraulic oil, which is a pressurizing medium, is supplied from the lower side of the cylinder, and this pressurizing effect is utilized. This will be explained in more detail below. First, a rectangular raw material W, for example, is placed at a predetermined position on the lower mold 12 . Thereafter, the upper die 11 is lowered and pressure is applied to the material W to form it into a preliminary shape W' (hereinafter, this will be referred to as primary forming). The purpose of this stage is to form a guide portion 20 to facilitate secondary molding, which will be described later. Specifically, as shown in FIGS. 5 and 6(C), the preliminary shape W' includes a plurality of guide protrusions 21 at the bottom, and a guide recess 22 formed from above on the center line of the guide protrusions 21. It consists of being done. Further, the upper mold 11 and the lower mold 12 used to form such a preliminary shape W' are provided with a guide molding pin 13 for forming a guide recess 22 in the upper mold 11, as shown in FIG. A plurality of guide molding recesses 14 for forming the guide protrusions 21 are carved on the upper surface of the lower mold 12. In addition, this guide part molding pin 13 and the guide part molding four parts 14
It goes without saying that the shape is not limited to the shape shown in this embodiment, and that various forms can be taken. Next, the product molded into the preliminary shape W' in this manner is once removed from the mold 10. During removal in this case, since the degree of plastic deformation of the guide protrusion 21 and the guide recess 22 is not necessarily large, it seems unnecessary to use a pressurizing means using hydraulic oil as a pressurizing medium, as will be described later. However, this method may be adopted if necessary. Then, an upper mold 11 used for molding into the preliminary shape W' for performing secondary molding.
The intermediate molded member molded into the preliminary shape W' is placed on another press molding machine equipped with a mold 10 having a shape different from that of the lower mold 12, or the intermediate molded member molded into the preliminary shape W' is placed on another press molding machine equipped with a mold 10 having a shape different from that of the lower mold 12, or the intermediate molded member molded into the preliminary shape W' is placed. When using the same press molding machine, the upper mold 11 and the lower mold 12
is replaced with the mold 10 for secondary molding, and the intermediate molded member is placed again. Then, the upper mold 11 is lowered, and the intermediate molded member molded into the preliminary shape W' is pressed and molded into the final shape (this is called secondary molding).
. The shapes of the upper mold 11 and lower mold 12 used in this case are as shown in FIG. is provided with a plurality of pin-shaped projection molding holes 17 on the upper surface. This pin-shaped protrusion molding hole 17 is configured so that a small diameter part and a large diameter part are repeated in a step-like manner, and the dimension of the small diameter part becomes the outer diameter dimension of the pin-shaped protrusion 3 of the metal member 1a which is the final shape. When pressure is applied, the hollow part molding pin 16 is guided to the guide recess 22 and the guide convex part 21 is guided to the pin-like protrusion molding hole 17 to form the final shape as detailed in the first invention of the present application. A metal member 1a like this is molded. And mold 10
Release the pressure and stop the machining. In addition to the plastic working using the hollow forming pin 16, the means for forming the hollow part 4 is to form a pin-shaped protrusion without a hollow part, and then perform drilling as a processing, which is used in combination with the extrusion molding to form the metal. It is also possible to mold the member 1a. Subsequently, the processed metal member 1a is extracted from the mold 10, but each pin-shaped protrusion 3 is in a state of biting into each other in the pin-shaped protrusion molding hole 17, and therefore, it is removed by the following operation. Pull it out. That is, in this state, the pressurizing chamber 25 provided below the lower die 12 is filled with hydraulic oil as a working medium, and then the pressurizing piston 26 is raised to reduce the hydraulic pressure in the pressurizing chamber 25. This applies equal pressure to each pin-shaped protrusion 3 in the returning direction. As a result, the metal member 1a is evenly pushed back from the mold 10 without tilting, and is removed. At this time, regarding the upper mold 11, the metal member 1a may be raised immediately after completion to completely release the pressurized state, but the upper mold 11
may be positioned away from the metal member 1a so that the pressure rises to a higher degree in accordance with the rise in pressure of the hydraulic oil in the pressurizing chamber 25. That is, while abutting against the upper surface of the metal member 1a,
An action may be performed to control the posture. Further, if the upper mold 11 used in the primary molding and the same mold used in the secondary molding can be used, the upper mold 11 does not need to be replaced. The hollow molded pin 16 can have various cross-sectional shapes as shown in FIG. Further, even if the external shape is formed, it is also possible to configure it in a tapered shape in consideration of ease of extraction from the hollow portion 4 after molding is completed.

The hollow part 4 has such a cross-sectional shape in consideration of the case where a refrigerant is sealed in the hollow part 4 in order to enhance the heat dissipation effect. This is an attempt to utilize the capillary phenomenon that occurs in the groove 4a, the apex portion 4b, and the groove portion 4C.

Further, the metal product of the present invention can be used not only as a heat dissipation component for LSI and other electronic components as described above, but also for storing a sensor used for temperature detection or humidity detection in the hollow portion 4. and can also be used.

Further, the shape of the base material portion 2 is not limited to a flat plate shape, but a seed-shaped shape as shown in FIG. 8 can be adopted.

(Effects of the Invention) The present invention has the configuration described above, and exhibits the following effects. First of all, since the processing of the series is done only by extrusion molding, and it can be used without the use of heat dissipation fins, other accessory parts, or mounting parts, it is a low-cost and high-performance product that surpasses conventional molding in terms of production cost. A metal member 1a can be provided. In addition, when removing the metal member 1a from the mold 10 during manufacturing,
Since this is carried out by hydraulic operation using hydraulic oil as a pressurized medium, it can be removed and removed reliably, and the gold clay member 1a after processing will not be damaged. Furthermore, since the molding process is divided into two stages: primary molding for molding the preliminary shape W′ and secondary molding for molding the final shape,
There is no need to place an excessive burden on the mold 10.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how the metal member for heat dissipation of the present invention is used; FIG. 2 is a perspective view of the metal member of the present invention; FIG. FIG. 4 is a perspective view showing a primary molding mold for molding the metal member of the present invention, FIG. 5 is a perspective view showing a secondary molding mold as above, and FIG.
The figure is an explanatory diagram schematically showing the step of molding a metal member, and FIG. 7 is a perspective view showing a hollow part forming pin and various embodiments of the cross-sectional shape of the hollow part formed by this forming pin.
FIG. 8 is a perspective view showing another embodiment of the base member. 1; heat dissipation component 1a; metal member 2; base material part 3; pin-shaped protrusion 4; hollow part 4a; groove 4b; apex part 4C; groove part 5; opening part 10; mold 11; upper mold 12; lower mold 13 Guide part molded pin 14; Guide part molded recess 16; Hollow part molded pin 17; Pin-shaped projection molded hole 20; Guide part 21; Guide convex part 22; Guide recess 25; Pressure chamber 26; Pressure piston W; Material W′; Preliminary shape L; Hydraulic oil

Claims (2)

[Claims] (1) A pin-shaped protrusion is formed on at least one surface of a base material having an appropriate shape by pressure molding, and a hollow part is provided inside the pin-shaped protrusion, and the pin-shaped protrusion is formed into a tubular shape. A metal member for heat dissipation, etc., characterized by having a formed. (2) Pressure is applied to the material by an upper mold comprising a large number of guide molding pins and a lower mold having a plurality of guide molding recesses carved in positions opposite to the guide molding pins, The material is plastically deformed and molded into a preliminary shape, and then further pressed by an upper mold having a hollow molding pin and a lower mold having a pin-shaped protrusion molding hole at a position opposite to the hollow molding pin. A metal member for heat dissipation, etc., characterized in that it is molded into the final shape, and after the molding is completed, a pressurized medium is supplied from below the lower mold to apply an average removal force to the product. manufacturing method.