JPH0955458A - Manufacture of heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat sink, which reduces the number of processes and the like, reduces production processing cost and at the same time, reduces also the labor hour of a work. SOLUTION: In this manufacturing method, a frame wall body 7 with a recessed section, a plurality of sheets of corrugated sheets 8, flat plates 9, a flat cap body 10 and the like are first prepared and at the same time, bonding materials R, such as a bonding agent or a brazing agent, are provided at abutment and bonding places between these of the sheets 8 and the plates 9 in after the preparation. Then, the plurality of sheets of the corrugated sheets 8 and the plates 8 are laminated and filled in the body 7 to form a honeycomb structure, which consists of a planar assembled body constituted of hollow pillar-shaped cells 13, and at the same time, the cap body 10 is made to cover on the body 7 along the axial directions of the cells while being made contact with this honeycomb structure. After that, this body 7, the sheets 8, the plates 9 and the cap body 10 are bonded together at one time with the materials R by heating and a heat sink 6 is obtained. In the sink 6, an object A to be cooled is arranged on the outside and cooling air is made to pass through the honeycomb structure, whereby the heat dissipation and cooling of the sink is executed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a heat sink. That is, the heat dissipation of the cooling object such as an electronic circuit such as an IC, an electronic substrate, an electronic component, an electronic device, a computer, a motor, and various other heating elements,
The present invention relates to a method for manufacturing a heat sink used for cooling.

[0002]

2. Description of the Related Art As a heat sink, various kinds have been developed and used, but recently, a honeycomb structure has been developed and used by taking advantage of the characteristic that the surface area per unit volume is large. . FIG. 5 is a front view of such a honeycomb structure. (1) shows a step of laminating and joining corrugated plates and flat plates, and (2) shows a step of filling and joining to a frame wall. Indicates. As shown in the figure,
In this type of conventional heat sink 1 having a honeycomb structure, first, a corrugated plate 2 and a flat plate 3 made of metal are laminated and joined together by heating with an adhesive or a brazing material, and then this is strengthened over the entire strength. And the inside of the frame wall body 4 for improving the appearance, and by heating and bonding with the frame wall body 4 by using an adhesive or a brazing material, further, adhesion to a cooling object such as a heating element, It was manufactured by covering the flat lid 5 to secure the attachability and heating and joining the flat lid 5 with an adhesive or a brazing material. The honeycomb heat sink 1 manufactured in this way is cooled by the cooling air passing between the opening end faces of the honeycomb structure formed by the corrugated plate 2 and the flat plate 3 which are stacked, joined and filled. The object to be cooled, such as the attached heating element, was dissipated and cooled.

[0003]

By the way, the following problems have been pointed out in such a conventional example. That is, the honeycomb heat sink 1 of this type of conventional example is
As described above, the step of stacking and joining the corrugated plate 2 and the flat plate 3,
Further, it is manufactured by following each process of filling the frame wall body 4, joining process, covering the flat lid body 5, joining process, etc. Firstly, manufacturing cost is increased, and secondly, work is performed. It was pointed out that the workability of work was poor. That is, in the manufacturing method of the heat sink 1 of this type of conventional example, the bonding is separately performed in each step,
For each step of filling and covering, there were many work steps because the work steps were carried in to carry out the predetermined contact / joint parts with the adhesive or brazing material carried into the heating furnace and interposed. Therefore, it has been pointed out that, firstly, the manufacturing and processing costs are high, and secondly, the work is time-consuming and the workability is poor.

In view of such circumstances, the present invention has been made to solve the above-mentioned problems of the prior art. In Claim 1, a corrugated plate is used, and in Claim 2, a flat plate is further laminated in the frame wall body. First, the manufacturing and processing cost is reduced by filling and filling the flat lid with the exception of claim 3 and then joining them by heating at the same time.
Secondly, it is an object of the invention to propose a method for manufacturing a heat sink, which also reduces the labor of work.

[0005]

The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows. That is, this claim 1
In the method for manufacturing a heat sink, first, a frame wall body having a concave cross section, a plurality of corrugated plates, and a flat lid body are prepared. A bonding material such as an adhesive or a brazing material is provided at least at a contact / bonding position between the plates. Then, a plurality of the corrugated sheets are stacked and filled in the frame wall body to form a honeycomb structure composed of a planar aggregate of hollow columnar cells, and the honeycomb structure is in contact with the honeycomb structure in the cell axial direction. Along the frame wall, the flat lid is covered. After that, the frame walls, the corrugated plates, the flat lids and the corrugated plates are heated to bond them at once with the bonding material. Accordingly, the object to be cooled such as a heating element is arranged outside the frame wall body or the flat lid body, and both opening end faces of the fixed honeycomb structure are opened to the outside to allow cooling air to pass therethrough. It is characterized in that a heat sink for radiating and cooling an object is obtained.

Next, claim 2 is as follows. That is, in the method for manufacturing the heat sink according to claim 2,
In the method of manufacturing a heat sink according to claim 1, a flat plate is further used, the bonding material is also provided on the flat plate as needed, and a plurality of flat plates and corrugated plates are alternately alternately arranged. The honeycomb structure is fixedly formed by stacking, filling, and bonding. Next, claim 3 is as follows. That is, this claim 3
In the method for manufacturing a heat sink according to claim 1, in the method for manufacturing a heat sink according to claim 1 or 2, the flat lid is not used, and only the frame wall body, the corrugated plate, and the flat plate are used. It is characterized by

Then, in this manufacturing method, each corrugated plate is preliminarily provided with a bonding material, and each flat plate is further laminated and filled in the frame wall body in claim 2 and claim 2. After covering the flat lids except for 3, the heat sinks can be obtained by joining the flat lids at one time by heating, so that the number of steps is greatly reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments of the invention shown in the drawings. 1, FIG. 2, FIG. 3, and FIG. 4 are front views provided for explaining the embodiment of the present invention. FIG. 1 shows one example thereof, FIG. 1 shows the corrugated plate and the flat plate, FIG. 2 shows the step of filling the frame wall body, and FIG. 3 shows the obtained heat sink. FIG. 2 shows another example, FIG. 1 shows the corrugated plate and the flat plate, FIG. 2 shows the step of filling the frame wall body, and FIG. 3 shows the obtained heat sink. FIG. 3 shows various examples of combinations of corrugated plates and flat plates. (1) shows the corrugated plate and the flat plate in the first combination example, and (2) shows the aggregate of the corrugated plates and the flat plate in the first combination example. , (3) shows the corrugated plate and the flat plate in the second combination example, (4) shows the corrugated plate and the flat plate assembly in the second combination example, and (5) shows the corrugated plate in the third combination example. , (6) shows the corrugated plate assembly in the third combination example. FIG. 4 shows still another example.

In the method of manufacturing the heat sink 6, first, a frame wall 7 having a concave cross section, a plurality of corrugated plates 8 and a flat plate 9, and a flat lid 10 are prepared, and the frame wall after the fact. A bonding material R such as an adhesive or a brazing material at least at the contact / bonding points among the body 7, the corrugated plate 8, the flat plate 9, and the flat lid body 10.
Is arranged.

These will be described in more detail. First, the frame wall body 7 has, for example, as shown in FIG. 1 (2) and FIG. 2 (2), a concave cross-section, that is, an upward cross-section U-shape with a wall thickness of about 1 mm to 5 mm. In the drawing, it has both left and right side surfaces 11 and a bottom surface 12, and the top surface and front and rear surfaces are open. The frame wall 7 is usually made of aluminum, copper,
Iron and other metal materials having excellent thermal conductivity are used, and such metal materials can be obtained by extrusion molding, pultrusion molding, and bending molding. The flat lid body 10 is, for example, as shown in FIG. 1 (2) or FIG. 2 (2), has a flat plate shape with a wall thickness of about 1 mm to 5 mm, and has the above-mentioned frame. A metal material is usually used according to the wall 7. And the flat lid 10 is
It is arranged between the upper ends of both side surfaces 11 of the frame wall body 7 and has a size and size sufficient to cover the open upper surface of the frame wall body 7. The frame wall body 7 and the flat lid body 10 are intended to reinforce the overall strength of the heat sink 6 and improve the appearance thereof, and also to the cooling target A such as a heating element.
It is used to improve the adhesion and attachment to the.

Next, the corrugated plate 8 has, for example, as shown in FIG. 1 (1) or FIG. 2 (1), corrugated irregularities having a substantially triangular cross-section, or the like. A trapezoidal shape without a cross section, a square shape, and other corrugated irregularities of various cross section shapes are formed by continuously bending in the longitudinal direction at a predetermined pitch and height. The corrugated plate 8 is bent and formed by a corrugating device using a gear or a rack, and the base material is usually aluminum,
Copper and other metal foils with excellent thermal conductivity are used. As the flat plate 9, such metal foil or the like is used as it is.

Next, as the joining material R, a metal brazing material, a metal solder, a resin adhesive having excellent thermal conductivity, or the like is used. And the bonding material R is
The portions where the respective constituent members come into contact and are joined are arranged by coating or clad. For example, the bonding material R
Is applied to the inner surface of the flat lid body 10, each corrugated plate 8, the flat plate 9, the inner surface of the frame wall body 7 (on the bottom surface 12 in the illustrated example) or the like, or is coated so as to cover it. Or applied only to the necessary portions, particularly in the case of the corrugated plate 8 only to the contact / joining portions such as the tops of the peaks and the bottoms of the valleys.

Next, in this manufacturing method, a plurality of corrugated plates 8 and flat plates 9 are sequentially stacked alternately and filled in the frame wall 7 to form a honeycomb formed of a planar aggregate of hollow columnar cells 13. The flat lid 1 is formed on the frame wall 7 along the cell axial direction while forming the structure and abutting on the honeycomb structure.
0 is covered.

These will be described in more detail. For example, FIG. 1 (2) diagram, (3) diagram, FIG. 2 (2) diagram, (3) diagram,
As shown in FIGS. 3 (1), 3 (2), 4 and the like, a large number of corrugated plates 8 are alternately arranged on the left and right in a vertical state with a flat plate 9 interposed therebetween for a half pitch of waves. They are shifted one by one, and are horizontally laminated in a block shape having a space as a whole under the positional relationship of aligning the troughs and peaks of the waves while interposing the flat plate 9 between the left and right sides. Along with this, the block body composed of the corrugated plates 8 and the flat plate 9 cut into a predetermined size based on such a positional relationship is densely filled in the frame wall body 7 from the upper surface side in the drawing. Therefore, although the block body composed of the corrugated plates 8 and the flat plate 9 is not yet fixedly bonded to each other, the corrugated plates 8 and the flat plate 9 are used as cell walls and are divided into independent spaces. A honeycomb structure composed of a planar aggregate of the hollow columnar cells 13 thus formed is formed. In addition, the cell 1 in the illustrated example
The cross-sectional shape of 3 consists of a substantially triangular shape with radius,
Regardless of this, regular hexagons, trapezoids, squares, and other various cross-sectional shapes are also possible. After that, the flat lid 10
However, on such a honeycomb structure or on both side surfaces 11 of the frame wall body 7,
It covers from the upper side along the cell axial direction between the upper ends.

Thereafter, in this manufacturing method, the frame wall 7, the corrugated plate 8, the flat plate 9, and the flat lid 10 are heated together so that they are joined at once by the joining material R arranged as described above. To do. These will be described in more detail. For example, as shown in FIG. 1 (3), each corrugated plate 8 and flat plate 9 are laminated,
The frame wall 7, which is filled with the honeycomb structure and covered with the flat lid 10, is heated at the melting point temperature of the bonding material R while being pressed from above, below, right and left, and the bonding material R is distributed. It will be joined at the place where it was installed. That is, until then, only the joining material R was provided and not joined to each other. The frame wall body 7, the corrugated plate 8, the flat plate 9, and the flat lid body 10 were joined together in this joining process. For the first time, they are joined together.

In this manufacturing method, the heat sink 6 is manufactured by following these steps. In this heat sink 6, as shown in (3) of FIG. 1 and (3) of FIG. 2, a cooling object A such as a heating element is
The corrugated plate 8 is arranged outside the frame wall 7 and the flat lid 10.
Both opening end faces of the honeycomb structure formed by the flat plate 9 and fixed by joining are opened to the outside and the cooling air passes therethrough, thereby radiating and cooling the cooling target A.

These will be described in more detail. As the cooling target A that is closely attached to and attached to the outside, for example, an electronic circuit such as an IC, an electronic substrate, an electronic component, an electronic device, a computer, a motor, and various other heating elements can be considered.
Further, a honeycomb structure formed of a planar aggregate of hollow columnar cells 13 formed with the corrugated plates 8 and the flat plates 9 as cell walls has excellent weight ratio strength, is lightweight, and has high rigidity and strength, It is known that the surface area per unit volume is large and so on. That is, the heat radiation area in contact with the cooling air is large, and the heat radiation characteristics are excellent. Then, the heat from the cooling target A is transferred to the corrugated plates 8 and the flat plates 9 which are the cell walls of the honeycomb structure through the frame wall body 7 and the flat lid body 10. And each cell 1 formed of flat plate 9
3 inside from the one opening end face to the other opening end face,
When the cooling air from the forced cooling fan or the like passes, the above-mentioned heat is taken away, so that the heat dissipation of the cooling object A
Cooling is performed.

The present invention is constructed as described above. Then it becomes as follows. In the method for manufacturing the heat sink 6, the corrugated plates 8 and the flat plates 9 on which the bonding material R is arranged in advance are stacked and filled in the frame wall body 7, and the flat lid body 10 is covered. These are joined at once. That is, each step such as stacking each corrugated plate 8 and flat plate 9, filling them into the frame wall body 7, covering with the flat lid body 10 and the like is performed at one time, and one heating step by one joining step is performed. Due to
The corrugated plate 8 and the flat plate 9, as well as these, the frame wall body 7, the flat lid body 10, and the like are all joined at once with the joining material R, so that the heat sink 6 is obtained. As described above, according to the method of manufacturing the heat sink 6, the number of steps is greatly reduced,
First, the manufacturing processing cost is reduced, and secondly, the labor required for the work is reduced.

First, (1) in FIGS. 1, 2 and 3
In the illustrated example shown in FIG. 2, (2), FIG. 4, etc., each corrugated plate 8 is staggered by a half pitch between the left and right sides while alternately interposing flat plates 9 in sequence, and the corrugated plates 8 The valley portion and the top portion are laminated and joined in a positional relationship of being aligned with each other, but the method for manufacturing the heat sink 6 according to the present invention is not limited to this. For example, as shown in FIGS. 3 (3) and 3 (4), the corrugated plates 8 are laminated and joined in a random and irregular positional relationship with each other through the flat plate 9. May be. Further, as shown in FIGS. 3 (5) and 6 (6), only the corrugated plate 8 may be laminated and joined without using the flat plate 9. In this case, the corrugated plates 8 are set in the mutual positional relationship of the illustrated examples as described above, and thus are a planar aggregate of the hollow columnar cells 13 having the corrugated plates 8 as the cell walls. Is formed.

Secondly, in the illustrated examples shown in FIGS. 1, 2 and 4, the corrugated plates 8 and the flat plates 9 are vertically filled in the frame wall body 7 and laminated horizontally. The method of manufacturing the heat sink 6 according to the present invention is not limited to this. That is, each corrugated plate 8 or flat plate 9 is 90
Alternatively, the honeycomb structure may be formed by filling the frame wall body 7 in a horizontal direction and vertically laminating it in parallel with the flat lid body 10 by changing the direction.

Thirdly, in the example shown in FIG. 2, the fitting portions 14 are arranged inside the upper ends of both side surfaces 11 of the frame wall body 7. The fitting portion 14 has both ends of the flat lid body 10 which are covered as described above, and has a concave shape so that the flat lid body 10 is engaged and fitted, and the flat lid body 10 which is covered is fixedly held until the joining process is completed. It works as it should.

That is, as described above, after the corrugated plate 8 and the flat plate 9 are stacked and filled in the frame wall body 7, the flat lid body 10 is put on. The flat lid body put on in this way 10
Is not fixed before the joining step, and is easily afloated or laterally displaced by coming into contact with, for example, each of the laminated and filled corrugated plates 8 and flat plates 9, and is difficult to be accurately positioned. Therefore, in order to prevent these, usually separately,
The holding jig / positioning / fixing jig of the flat lid body 10 is used until the joining process, but like the method for manufacturing the heat sink 6 of the example shown in FIG.
When covering, the left and right ends of the frame wall body 7 on both sides 11
By engaging and fitting in the fitting portion 14 at the upper end,
The flat lid 10 is securely prevented from floating and displacement, and the flat lid 1
0 is accurately positioned and held. The fitting portion 14 is, for example, flat-polished on the surface of the flat lid body 10 after the joining process, that is, after the flat lid body 10 is joined to the upper ends of both side surfaces 11 of the frame wall body 7 or each corrugated plate 8 or the flat plate 9. In the process of performing, the portion protruding above the flat lid body 10 is scraped off and removed. As a result, for example, the same heat sink 6 as shown in FIG. 1 (3) is finally obtained.

Fourth, in the example shown in FIGS. 1 and 2,
Although one frame wall body 7 and one flat lid body 10 are used in a corresponding manner, the method for manufacturing the heat sink 6 according to the present invention is not limited to this. That is, as in the example shown in FIG. 4, the flat lid body 10 is prepared in advance as a plurality of pieces integrally connected to each other via the connecting portions 15.
After the corrugated plates 8 and the flat plates 9 are stacked and filled on each frame wall body 7, the frame wall bodies 7 are commonly covered with the corrugated plate 8 and the flat plate 9, and at that time, the spacer 16 for maintaining the space between the frame wall bodies 7 is It is interposed immediately below the connecting portion 15 between the upper ends of the side surfaces 11 of each frame wall body 7. Then, the joining step is followed, and after joining the flat lid body 10 and the upper end of the side surface 11 of each frame wall body 7 and the like by heating, each flat lid body 10
The connecting portion 15 in which the spaces are integrated is cut and removed together with the spacer 16 by a cutter or the like.

Thus, finally, the heat sink 6 shown in FIG. 1 (3) is obtained, in which one frame wall body 7 and one flat lid body 10 are associated and joined. Will be available. In the example of FIG. 4, a plurality of frame walls 7 and flat lids 10 are formed in the steps up to the joining step.
Since these are collectively and commonly processed, there is an advantage that the manufacturing process is made efficient.

Fifthly, in the example shown in FIGS. 1, 2 and 4, the flat lid 10 is essentially used, but in the method for manufacturing the heat sink 6 according to the present invention. It is also possible to use only the frame wall 7, the corrugated plate 8, the flat plate 9, etc. without using the flat lid 10. In this case, the heat sink 6 in which the upper end surfaces of the corrugated plate 8 and the flat plate 9 which are stacked, filled and joined to form a honeycomb structure are directly exposed to the outside from the open upper surface of the frame wall body 7 is obtained. . Of course, in this case, the object to be cooled A is closely attached to and attached to the outside of the frame wall 7.

Sixth, in the example shown in FIGS. 1 and 2,
The cooling object A is arranged outside the flat lid body 10 and is closely attached to and attached to the upper side in the drawing, but the heat sink 6 obtained by the manufacturing method of the present invention has the cooling object A in other places. May be arranged. For example, it may be closely attached to and attached to the outside of the frame wall 7, that is, below the bottom surface 12 of the frame wall 7 in the drawing. Further, these may be used together with the illustrated example arranged on the outside of the flat lid 10.

Seventh, in the example shown in FIGS. 1 and 2,
In the drawing, the corrugated plate 8 and the flat plate 9 are stacked in the frame wall 7 from the upper side,
Although filled, the method for manufacturing the heat sink 6 of the present invention is not limited to this. That is, the frame wall body 7 is arranged so as to be opened in the lateral direction by changing the direction by 90 degrees from the illustrated example, and the corrugated plate 8 and the flat plate 9 are arranged from the left and right sides with respect to such a frame wall body 7. It is also possible to stack and fill.

[0028]

As described above, the heat sink manufacturing method according to the present invention uses the corrugated plate in claim 1.
Then, the flat plate is further stacked and filled in the frame wall body, and the flat lid body is covered except for the third aspect, and then the two are joined at once by heating, so that the following effects are exhibited.

First, the manufacturing processing cost is reduced. That is, according to the method for manufacturing the heat sink, the steps of laminating the corrugated plates, laminating the corrugated plates and the flat plate, filling these into the frame wall body, covering the flat lid body, and the like are performed at one time. Then, the corrugated plates, the corrugated plates and the flat plates, and these, the frame wall body, the flat lid body, and the like are joined at one time in one joining step.
As a result, the number of steps is greatly reduced, and the manufacturing cost of the heat sink is greatly reduced as compared with the above-mentioned conventional example of this type.

Secondly, the labor of work is reduced. That is, according to this manufacturing method of the heat sink, the number of steps is greatly reduced for the same reason as the above-mentioned first, and the heat sink can be manufactured without time and effort compared with the conventional example of this kind described above. It will be greatly improved. As described above, the effects of the present invention are remarkably large, such that all the problems existing in this type of conventional example are solved.

[Brief description of drawings]

FIG. 1 is a front view of an example of a method for manufacturing a heat sink according to the present invention, which is used for explaining an embodiment of the invention, in which (1) shows the corrugated plate and the flat plate, and (2) shows Shows the step of filling the frame wall, and FIG. 3C shows the obtained heat sink.

FIG. 2 is a front view of another example provided for explaining the embodiment of the present invention, and FIG. 2 (1) shows its corrugated plate and flat plate,
The figure (2) shows the step of filling the frame wall body, and the figure (3) shows the obtained heat sink.

3A and 3B are front views showing various examples of combinations of corrugated plates and flat plates, FIG. 3A shows a corrugated plate and a flat plate in the first combination example, and FIG. The corrugated plate and the flat plate assembly are shown, (3) shows the corrugated plate and the flat plate in the second combination example, and (4) shows the corrugated plate and the flat plate assembly in the second combination example, (5)
The figure shows the corrugated sheet in the third combination example, and the figure (6) shows the corrugated sheet assembly in the third combination example.

FIG. 4 is a front view of still another example provided for explaining the embodiment of the present invention.

FIG. 5 is a front view for explaining this type of conventional example,
(1) The figure shows the process of laminating and joining the corrugated plate and the flat plate,
(2) The figure shows the steps of filling and joining to the frame wall.

[Explanation of symbols]

 1 heat sink (conventional example) 2 corrugated plate (conventional example) 3 flat plate (conventional example) 4 frame wall (conventional example) 5 flat lid (conventional example) 6 heat sink (present invention) 7) Frame wall (of the present invention) 8 Corrugated plate (of the present invention) 9 Flat plate (of the present invention) 10 Flat lid (of the present invention) 11 Side surface 12 Bottom surface 13 Cell 14 Fitting part 15 Connection part 16 Spacer A Cooling object R Bonding material

Claims (3)

[Claims] 1. A frame wall body having a concave cross section, a plurality of corrugated plates, and a flat lid body are prepared, and the frame wall body, the corrugated sheet, the flat lid bodies, and the corrugated sheet bodies are subsequently arranged. After arranging a bonding material such as an adhesive or a brazing material at least at the abutting / bonding location, stacking and filling a plurality of the corrugated plates in the frame wall body to form a planar assembly of hollow columnar cells. Forming a honeycomb structure made of a body, and covering the frame wall body with the flat lid body along the cell axis direction while abutting the honeycomb structure, the frame wall body, corrugated plate, flat lid body Between the corrugated sheets and between the corrugated sheets are joined at once by the joining material, so that the object to be cooled such as a heating element is arranged on the outside of the frame wall body or the flat lid body and fixed. A heat sink for radiating and cooling the object to be cooled by opening both open end surfaces of the honeycomb structure to the outside and passing cooling air therethrough. Method for manufacturing a heat sink characterized Rukoto, the. 2. The heat sink manufacturing method according to claim 1, wherein a flat plate is further used, the bonding material is also provided on the flat plate if necessary, and a plurality of flat plates and the corrugated plate are provided. A method for manufacturing a heat sink, characterized in that the honeycomb structure is fixedly formed by sequentially stacking, filling, and joining alternately. 3. The method of manufacturing a heat sink according to claim 1, wherein the flat lid is not used, and only the frame wall, the corrugated plate, and the flat plate are used. Manufacturing method of heat sink.