JP5142682B2 - Processing method of graphite heat conduction piece. - Google Patents

Description

  The present invention relates to a method for processing a graphite heat conductive piece, and more particularly to a method for processing a graphite heat conductive piece used for releasing heat generated from an electronic element such as a chip.

  The graphite heat conducting piece is usually applied to an electronic device such as a notebook type computer, and is attached to an electronic element such as a processor or chip set that generates high heat, and is used to release the generated heat.

  The graphite heat conduction piece is mainly composed of graphite and a filler. The filler has an effect of softening the graphite heat conductive piece, and facilitates processing. In some cases, the upper and lower surfaces of the graphite heat conductive piece are pressed with a mold to form irregularities in accordance with the outer shape of the electronic element to facilitate attachment to the electronic element.

  FIG. 1 discloses a graphite heat conductive piece that has been pressed by a conventional technique. According to the drawing, after the graphite heat conductive piece 2 is pressed, the bent portion 4 receives a pulling action. The density of graphite in this portion is clearly lower than the graphite density of the plate-like portion 6. Therefore, the heat conduction speed of the bent portion 4 also decreases. In other words, the bent portion 4 is a portion that hinders the heat conduction of the entire graphite heat conducting piece 2.

Moreover, FIG. 2 is explanatory drawing which showed the structure of the thermal radiation unit 10 by a prior art. That is, the technique disclosed in US Patent No. 2003 / 0116312A1. According to the drawing, a plurality of heat radiating members 14 are inserted on the surface of the graphite heat conducting piece 2 to constitute an ideal heat radiating unit 10. However, it is difficult to insert the heat radiating member 14 into the soft graphite heat conducting piece 2 and fix it, and when it receives external force, it is easily detached or destroyed.
US Patent Application No. 2003 / 0116312A1

  Therefore, it is considered that there is room for improvement in the method for processing the graphite heat conductive piece. Based on such knowledge, an object of the present invention is to provide a method for processing a graphite heat conduction piece that can improve the decrease in heat conduction efficiency caused by the decrease in the density of graphite at the bent portion by greatly increasing the heat conduction efficiency. .

  Moreover, this invention makes it a subject to provide the processing method of the graphite heat conductive piece which implement | achieves the graphite heat conductive piece which can stabilize this, when a heat radiating member is inserted.

  Therefore, as a result of intensive research in view of the drawbacks found in the prior art, the present inventor has obtained a method for processing a graphite heat conductive piece having a constant contour outer shape. Sandwiching a conductive plate, pressing and cutting to form a graphite heat conduction piece having a constant contour and having a first thickness; and the graphite heat conduction by the male and female dies The piece is continuously pressed to obtain a preset second thickness from the first thickness, and the density of the graphite in the state of the second thickness is set to the first thickness. The present invention has been completed on the basis of the knowledge that the problem can be solved by the method for processing a graphite heat conductive piece characterized by including a step of increasing the height of the graphite heat conductive piece.

  The present invention will be specifically described below.

The method for processing a graphite heat conductive piece according to claim 1 is a method for processing a graphite heat conductive piece having an outer shape with a constant contour,
The graphite thermal conductive plate is sandwiched between the corresponding male and female molds, pressed and cut,
Forming a graphite heat conducting piece having a constant contour outline and having a first thickness;
The graphite heat conduction piece is continuously pressed by the male type and the female type to obtain the second thickness set in advance from the first thickness, and in the state of the second thickness. Increasing the density of the graphite relative to the state of the first thickness.

  According to a second aspect of the present invention, there is provided a method of processing a graphite heat conductive piece, wherein an inner holding plate is provided at the bottom of the female die in claim 1, and the upper and lower surfaces of the graphite heat conductive piece are pushed by the male die and the inner holding plate. The unevenness forming part is formed by pressing and bending.

  According to a third aspect of the present invention, there is provided a method for processing a graphite heat conductive piece, wherein an inner holding plate is provided at the bottom of the female die in claim 2, and the upper and lower surfaces of the graphite heat conductive piece are pressed by the male die and the inner holding plate. It is formed in an uneven shape.

  The method for processing a graphite heat conductive piece according to claim 4 is characterized in that the graphite heat conductive piece according to claim 2 includes a graphite layer and a film layer covering an outer surface of the graphite layer, and the film layer is an aluminum foil. Or a film layer selected from the group consisting of copper foil or coated film material.

The method for processing a graphite heat conduction piece according to claim 5 is a method of processing a graphite heat conduction piece which has been cut in the step of claim 1 to have a specific contoured outer shape, and is further formed on the upper surface of the graphite heat conduction piece. Forming one or more first concave portions; inserting a bottom end of a heat dissipation member having a second concave portion formed laterally on a side surface of the bottom end into the first concave portion;
The graphite heat conductive piece is continuously pressed to change from the first thickness to a preset second thickness, and the graphite on the side surface of the first concave portion is moved into the second concave portion. And firmly connecting the heat dissipating member to the graphite heat conducting piece.

  In the method for processing a graphite heat conductive piece according to claim 6, the heat dissipating member in claim 5 is made of a metal material.

  In the method for processing a graphite heat conductive piece according to claim 7, the heat dissipating member in claim 5 is made of graphite.

The method for processing a graphite heat conductive piece according to claim 8 is the third thickness by the corresponding male type and female type before inserting the bottom end of the heat dissipation member in claim 5 into the first concave part. Cutting with pressing and sandwiching the heat dissipating member having
The heat dissipation member cut by the male and female dies is pressed against the heat dissipation member by using a protruding portion provided between the male and female dies, and the first thickness is increased. A fourth thickening step that does not exceed the width of the recess.

  According to a ninth aspect of the present invention, there is provided a method for processing a graphite heat conductive piece, wherein the first concave portion in the fifth aspect is a groove, and the heat radiating member has a plate shape.

  According to a tenth aspect of the present invention, there is provided a method for processing a graphite heat conductive piece, wherein the first concave portion in the fifth aspect is a hole, and the heat radiating member has a columnar shape.

  According to the eleventh aspect of the method for processing a graphite heat conductive piece, an adhesive is applied to the bottom end of the heat dissipating member in the fifth aspect and is inserted into the first concave portion.

  The method for processing a graphite heat conductive piece according to claim 12 is the method of processing the graphite heat conductive piece when the graphite heat conductive piece in claim 1 is pressed and cut and then further pressed. The portion is pressed to a preset second thickness, the other portion maintains the first thickness, and the density of the graphite in the second thickness portion is reduced to that in the first thickness portion. Be higher than the density of graphite.

  In order to be manufactured by the method of processing a graphite heat conduction piece according to the present invention, the heat conduction efficiency of the graphite heat conduction piece may be reduced at the bent portion even if irregularities are formed along the shape of the applied electronic element. Therefore, there is an advantage that it can be widely applied to electronic devices that generate high heat, and a preferable heat conduction effect can be obtained.

  In addition, in order to be manufactured by the method for processing a graphite heat conduction piece according to the present invention, a stable connection is obtained when a heat radiating member is inserted into the graphite heat conduction piece, so that not only the yield can be increased in production, It has the advantage that the service life can be extended.

  The method for processing a graphite heat conductive piece according to the present invention will be described below with reference to the drawings with reference to specific examples in order to describe the features in detail.

  FIG. 3 discloses a method for processing a 9 graphite heat conductive piece according to the present invention. According to the drawing, after being processed, the graphite heat conducting piece 30 comprises a contour 31 having a specific contour as disclosed in FIG. For example, according to FIG. 4, the graphite heat conducting piece 30 is configured by sandwiching a graphite layer 34 between two layers of aluminum foil 32. Actually, the graphite layer 34 may be constituted alone and may not be covered with any film layer, or some or all of the aluminum foil 32 may be replaced with copper foil or a film material. Can do.

  The graphite layer 34 is composed of graphite and a filler, and the graphite provides a heat conduction function, and the filler has a softening action.

  About the processing method, the step in the case of processing based on the mold structure 39 disclosed in FIG. 5 will be described.

  The mold structure 39 includes a male mold 40 and a female mold 42, and a protruding portion 41 is provided on the side of the male mold 40. An internal holding plate 44 is provided inside the female mold 42. The female mold 42 and the internal holding plate 44 are provided on the die set base 46, and an elastic member 48, for example, a spring is provided between the internal holding plate 44 and the die set base 46 (not necessarily provided). The graphite heat conductive plate 35 is placed between the male mold 40 and the female mold 42.

  The method of the present invention will be described with reference to FIGS. The method of the present invention includes the following steps.

  In step S02, the graphite heat conduction plate member 35 is sandwiched between the male die 40 and the female die 42 and cut into the graphite heat conduction piece 30 having the outer shape 31 with a specific contour. The raphite heat conductive piece 30 has a first thickness D1 having a constant thickness.

  Next, in step S06, the graphite heat conduction piece 30 cut by the male die 40 and the female die 42 (in FIG. 5, the graphite heat conduction piece 30 pressed by the male die 40 and the internal holding plate 44 is further shown. (Disclosed) is controlled by the protruding portion 41 provided between the male die 40 and the female die 42, and the graphite heat conducting piece 30 is pressed to be changed from the first thickness D1 to the second thickness D2. The second thickness D2 is thinner than the first thickness D1. The graphite heat conduction piece 30 thus pressed has a high graphite density. Therefore, the graphite heat conduction piece 30 after being pressed can obtain a preferable heat conduction effect.

  6 and 7, the method according to the invention is further described. FIG. 6 is a flow chart disclosing the manufacturing steps of the graphite heat conductive piece 30 with the upper and lower surfaces formed with irregularities, and FIG. 7 is an explanatory view showing the mold structure 39.

  The graphite heat conductive piece 30 includes a concave-convex molded portion 55 (FIG. 22 discloses the external appearance) according to the external shape of an electronic element such as a chip. Although the graphite density of the concavo-convex molded portion in the conventional technique is lowered, the bent portion 52 of the concavo-convex molded 55 portion disclosed in FIG. 6 can improve such a problem.

  The step disclosed in FIG. 6 includes the following steps after the graphite heat conductive piece 30 is cut in the above-described step S02 to form the outer shape 31 having a specific contour.

  In step S04, the surface of the graphite heat conductive piece 30 is pressed by the male die 40 and the female die 42 to form the concave and convex portions 55 on the upper and lower surfaces.

  Next, in step S06, the graphite heat conductive piece 30 that has been pressed and bent is continuously pressed to change the graphite heat conductive piece 30 from the first thickness D1 to the second zero thickness D2.

  Not only can the steps described above increase the density of the graphite and increase the efficiency and speed of heat conduction. A part of the graphite of the flat plate-like portion 54 of the graphite heat conducting piece 30 receives the pressing pressure and moves to the bent portion 52. For this reason, the density of graphite at the bent portion 52 of the graphite heat conducting piece 30 is close to the graphite density of the flat plate portion 54 having the second thickness D2, and the bent portion is thermally conductive as seen in the prior art. It can improve the problem of obstruction.

  The processing method disclosed in FIG. 6 is a step when the mold structure 39 disclosed in FIG. 7 is applied. As disclosed in FIG. 7, the female die 42 is provided with an internal holding plate 46 on the bottom surface. This is provided in accordance with the concave / convex molding by the male mold 40.

  Next, the upper and lower surfaces of the graphite heat conductive piece 30 are bent by the male die 40 and the internal holding plate 46 to form the unevenness forming portions 55 on the upper and lower surfaces of the graphite heat conductive piece 30.

  FIG. 8 is a flowchart showing the steps of inserting the heat radiating member 70 into the lafite heat conducting piece 30, and FIG. 9 is an explanatory view showing the graphite heat conducting piece 30 formed by the steps disclosed in FIG. 8.

  As disclosed in FIG. 9, a plurality of concave portions are formed on the graphite heat conducting piece 30, and a plurality of heat dissipation members 70 are inserted into the concave portions. Each heat dissipating member 70 is formed with at least one or more second concave portions 64 in the lateral direction on the side surface of the bottom end inserted into the first concave portion 62. The shape of the second concave portion 64 is as disclosed in FIGS. 9A, 9B, and 9C.

The method disclosed in FIG. 8 further includes the following steps after obtaining the graphite heat conductive piece 30 having the outer shape 31 having a specific contour by cutting by the step of S02 described above.

In step S03 , at least one or more first concave portions 62 are formed on the upper surface of the graphite heat conductive piece 30.

  In step S <b> 05, the bottom end of the heat dissipation member 70 is inserted into the first concave portion 62. At least one or more second concave portions 64 are formed in the lateral direction on the side surface of the bottom end of the heat dissipation member 70.

  In step S06, the graphite heat conduction piece 30 is pressed from above by the mold structure 39, the graphite heat conduction piece 30 is changed from the first thickness D1 to the second thickness D2 set in advance, and the density of the graphite is increased. Increase. In this case, the density of the graphite increases, and a part of the graphite on the side surface of the first concave portion 62 is pressed and moved to the second concave portion 64. Therefore, the heat radiating member 70 is securely connected to the graphite heat conducting piece 30. Therefore, not only can the heat conduction efficiency be improved, but the heat radiating member 70 can be firmly connected to the graphite heat conduction piece 30.

  The heat dissipation member 70 may be a metal member or may be made of graphite. When graphite is used as the material, the manufacturing method includes the following steps before the bottom end of the heat dissipation member 70 is inserted into the first concave portion 62 in the step of S05, as disclosed in the flowchart of FIG.

  In step S010, the heat radiation member 70 is sandwiched between the corresponding male mold 40 and female mold 42, and the heat radiation member 70 is pressed to a third thickness.

In step S012, the heat radiating member 70 is continuously pressed by the male mold 40 and the female mold 42 and controlled using the protruding portion 41 between the male mold 40 and the female mold 42, and the heat radiating member is moved to the third shape. The thickness is set to a preset fourth thickness. The fourth thickness does not exceed the width of the first concave portion 62.

  The first concave portion 62 described above may be a groove or a hole having a concave shape. If the first concave portion 62 is a groove, the heat dissipation member 79 has a plate-like outer shape. If the first concave portion 62 is a hole having a concave shape, the heat radiation member 79 has a columnar outer shape.

  The heat dissipation member 70 described above is referred to as a heat dissipation fin in this business. In the present application, the outer shape of the heat dissipation member 70 is not limited to the shape disclosed in the drawings. Any of the above-described outer shapes may be used.

  Before inserting the heat radiating member 70 into the first concave portion 62 in the step of S05, when an adhesive is applied in advance to the bottom end of the heat radiating member 70 and inserted into the first concave upper portion 62, the connection is made more robustly. Also good.

  In addition, when pressing the graphite heat conduction piece 30, in addition to increasing the density of graphite that can press the entire graphite heat conduction piece 30, a part of the graphite heat conduction piece 30 is pressed and only the pressed part is pressed. The first thickness D1 may be changed to a second thickness D2 set in advance, and the other portions of the graphite heat conductive piece 30 may be maintained at the first thickness D1.

  The portion of the graphite heat conductive piece 30 having the second thickness D2 has a high graphite density and high heat conduction efficiency. The relatively thick first thickness portion has a low density of graphite, so the heat conduction effect is not high. This first thickness portion can be applied to other different application fields. Such applications also belong to the scope of the technology of the present invention.

  The graphite heat conducting piece 30 according to the present invention is applied to release heat generated from an electronic device such as a chip. The processing method uses the protruding portion 41 provided between the male die 40 and the female die 42 to increase the graphite density by making the graphite heat conduction piece 30 a predetermined thickness, thereby increasing the heat conduction efficiency. It is what raises. This pressing method solves the problem that the graphite density at the bent portion is lowered and the heat conduction effect is lowered as seen in the prior art, and the heat radiation member 70 is inserted into the graphite heat conduction piece 30. Robust and stable connection is obtained.

  The above is a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Accordingly, any modifications or changes that can be made by those skilled in the art, which are made within the spirit of the present invention and have an equivalent effect on the present invention, belong to the scope of the claims of the present invention. And

It is explanatory drawing which showed the structure of the graphite heat conductive piece by a prior art. It is explanatory drawing which showed the structure of the thermal radiation unit by a prior art. It is the flowchart which showed the processing method of the graphite heat conductive piece by this invention. It is explanatory drawing which showed the structure of the graphite heat conductive piece by this invention. FIG. 4 is a cross-sectional explanatory view showing the structure of a mold applied to the method disclosed in FIG. 3. It is the method of this invention, Comprising: It is the flowchart which showed the method of forming an unevenness | corrugation in a graphite heat conductive piece. FIG. 7 is a cross-sectional explanatory view showing the structure of a mold applied to the method disclosed in FIG. 6. It is the flowchart which disclosed the step which inserts a heat radiating member in this invention. It is explanatory drawing which showed the structure of the graphite heat conductive piece manufactured by applying the step disclosed in FIG. It is explanatory drawing which showed the connection structure of the thermal radiation member and graphite heat conductive piece in this invention. It is explanatory drawing which showed the other connection structure of the thermal radiation member and graphite heat conductive piece in this invention. It is other explanatory drawing which showed the connection structure of the heat radiating member and graphite heat conductive piece in this invention. It is the flowchart which showed the processing method of the heat radiating member which uses graphite as a material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat radiation unit 2, 30 Graphite heat conduction piece 31 External shape 32 Aluminum foil 34 Graphite layer 35 Graphite plate material 39 Mold structure 40 Male type 41 Protruding part 42 Female type 44 Internal holding plate 46 Die set base 48 Elastic member D1 1st thickness D2 2nd thickness 4, 52 Bending location 6, 54 Flat plate portion 55 Concavity and convexity forming portion 62 First concave portion 64 Second concave portion 14, 70 Heat dissipation member

Claims (11)

A method for processing a graphite thermal conductive piece having a constant contour outer shape,
The graphite thermal conductive plate is sandwiched between the corresponding male and female molds, pressed and cut,
Forming a graphite heat conducting piece having a constant contour outline and having a first thickness;
The graphite heat conduction piece is continuously pressed by the male type and the female type to obtain the second thickness set in advance from the first thickness, and in the state of the second thickness. And a step of increasing the density of the graphite as compared with the state of the first thickness.   2. An uneven holding portion is formed by providing an internal holding plate at the bottom of the female die and pressing and bending the upper and lower surfaces of the graphite heat conducting piece with the male die and the internal holding plate. The processing method of the graphite heat conductive piece of description.   3. The graphite according to claim 2, wherein an inner holding plate is provided at the bottom of the female die, and the upper and lower surfaces of the graphite heat conducting piece are pressed and pressed by the male die and the inner holding plate to form an uneven shape. Processing method of heat conduction piece.   The graphite heat conducting piece includes a graphite layer and a film layer covering an outer surface of the graphite layer, and the film layer is selected from the group consisting of an aluminum foil, a copper foil, or a coated film material. The method for processing a graphite heat conductive piece according to claim 2, wherein the method is a film layer. A method for processing a graphite thermal conductive piece having a constant contour outer shape,
Sandwiching a graphite heat conduction plate material between corresponding male and female dies, pressing and cutting, forming a graphite heat conduction piece having a constant contour and having a first thickness;
Forming at least one or more first concave portions on the upper surface of the graphite heat conducting piece;
Inserting a bottom end of a heat dissipation member having a second concave portion formed laterally on a side surface of the bottom end into the first concave portion;
The graphite heat conductive piece is continuously pressed to change from the first thickness to a preset second thickness, and the graphite on the side surface of the first concave portion is moved into the second concave portion. And firmly connecting the heat radiating member to the graphite heat conductive piece.   6. The method for processing a graphite heat conductive piece according to claim 5, wherein the heat radiating member is made of a metal material.   6. The method for processing a graphite heat conductive piece according to claim 5, wherein the heat radiating member is made of graphite.   6. The method for processing a graphite thermal conductive piece according to claim 5, wherein the first concave portion is a groove, and the heat radiating member has a plate shape.   6. The method for processing a graphite thermal conductive piece according to claim 5, wherein the first concave portion is a hole, and the heat radiating member has a columnar shape.   6. The method for processing a graphite heat conductive piece according to claim 5, wherein an adhesive material is applied to a bottom end of the heat radiating member and inserted into the first concave portion.   After pressing and cutting the graphite heat conductive piece, when further pressing the graphite heat conductive piece, a part of the graphite heat conductive piece is pressed to a preset second thickness, and the other parts are 2. The graphite of claim 1, wherein the first thickness is maintained and the density of the graphite in the second thickness portion is higher than the density of the graphite in the first thickness portion. Processing method of heat conduction piece.

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