TWI534406B - Method for manufacturing heat disspation device - Google Patents

Description

Heat sink manufacturing method

The present invention is a method of manufacturing a heat sink, and more particularly to a method of manufacturing a heat sink including a heating step.

In the current heat sink, the basic form is to use a metal plate as the heat sink base, and a plurality of metal pieces are erected on the heat sink base as heat sink fins. The heat sink of this type is used to contact the heat sink base with electronic components to be dissipated, such as a central processing unit (CPU) and a graphic processing unit (GPU). The thermal energy emitted by the electronic component during operation can be transferred to a plurality of metal sheets via the heat transfer base through heat conduction, and then the heat energy is exchanged with the outside air by a plurality of metal sheets to cool the electronic components.

In addition, in the manufacture of the conventional heat dissipating device, it is possible to combine a plurality of metal sheets on the metal plate by a combination. The manufacturing method of combining the two elements with each other generally has the following joining methods: bonding, card slot Or locking methods. The adhesive system uses an adhesive to bond the two components to each other. This method is the easiest. However, the low thermal conductivity of the adhesive may hinder the heat conduction between the two components, thereby affecting the heat dissipation performance, and also has the concern of loosening. The card slot or the locking is made by the structural design, such as designing the embossing card slot or using the nut to bolt the bolt, etc., so that the two components can be joined and fixed, but this way, the contact surface can not be tightly closed, and The air layer is sandwiched in the gap to greatly reduce the heat conduction effect.

In addition, another method of manufacturing a heat sink is a knot such as a bolt or a bolt. The plurality of metal pieces and the plurality of clips are connected in series, so that the plurality of metal pieces and the plurality of clips are combined by the joint to be combined as a heat sink. However, the heat dissipating device simply clamps the plurality of metal pieces and the plurality of clips to each other by the bonding member, so that there is a possibility of thermal expansion and contraction between the metal sheets and the clips. The air gap, which will reduce the contact area between the metal piece and the clip, seriously affects the heat conduction between the metal piece and the clip, thereby greatly reducing the heat dissipation efficiency of the heat sink.

Therefore, how to improve the contact surface between the metal piece and the clip during the manufacture of the heat dissipating device is likely to cause a gap and an air layer to be in close contact, which causes a problem that the heat dissipating effect of the heat dissipating device is not good, which is currently a relevant industry One of the topics to be solved.

In view of the above problems, the present invention provides a method for manufacturing a heat dissipating device, in which a method for manufacturing a heat dissipating device is known, in which a metal sheet and a clip are easily separated by a gap or an air interface between the contact faces of each other, resulting in a metal sheet and a clip. The sheets do not fit snugly, so that the heat dissipation performance of the heat sink is greatly reduced.

The invention discloses a method for manufacturing a heat dissipating device, comprising the steps of: staggering a plurality of heat dissipating fins and a plurality of clips, so that adjacent ones of the fins are spaced apart to form a layer of heat dissipating structure; heating a layered heat dissipation structure; an extruded layered heat dissipation structure, which causes a plurality of heat dissipation fins and a plurality of clips to push each other; and a laminated layer heat dissipation structure, which combines a plurality of heat dissipation fins and a plurality of clips into one whole .

The utility model has the advantages that a plurality of heat dissipation fins and a plurality of clips are softened by baking, and a plurality of heat dissipation fins and a plurality of clips are sandwiched in a state in which the metal is softened. The film is formed by causing a plurality of heat-dissipating fins and a plurality of clips to be deformed by close fitting, and even merging the surfaces of the plurality of heat-dissipating fins with the surfaces of the plurality of clips to remove the two The gap and the air interface generated when contacting each other can improve the heat conduction between the plurality of fins and the plurality of clips, thereby improving the heat dissipation efficiency of the heat sink.

The features, implementations, and utilities of the present invention are described in detail below with reference to the drawings.

Referring to FIG. 1 to FIG. 5 , in the manufacturing method of the heat dissipation device 10 disclosed in the first embodiment of the present invention, a plurality of heat dissipation fins 110 and a plurality of clips 120 are first staggered to form a layer of heat dissipation. Structure 100 (S101). The heat dissipation fins 110 may be, but not limited to, a sheet or a plate material composed of a metal material such as aluminum or copper, and have a plurality of through holes 111 on the heat dissipation fins 110. The clip 120 may be, but not limited to, a sheet or plate composed of a metal material such as aluminum or copper or plastic, and a plurality of positioning holes 121 corresponding to the through holes 111 are formed on the clip 120. The length of the clip 120 is smaller than the length of the heat dissipating fins 110, so that the adjacent fins 110 are blocked by the clip 120 and separated by a spacing d (as shown in FIG. 2). An air flow passage for a gas to flow and/or to exchange heat with outside air.

In addition, a flow guiding surface 122 is formed on at least one side of the clip 120, and the flow guiding surface 122 may be formed on the clip 120 in an oblique plane or a curved surface. Moreover, the flow guiding surface 122 of the clip 120 is located in the air flow channel formed between the adjacent two heat radiating fins 110 for guiding the air flow to change the flow direction.

After the layered heat dissipation structure 100 is formed, a fixing piece 130 is disposed on one side of the layered heat dissipation structure 100, or two fixing pieces 130 are disposed on opposite sides of the layered heat dissipation structure 100, and the fixing piece 130 is disposed. The set position corresponds to the clip 120 (S102). The constituent material of the fixing piece 130 may be, but not limited to, steel, so that the melting point of the fixing piece 130 is larger than the heat dissipation fins 110 and the clips 120. In addition, a plurality of fixing holes 131 are formed on the fixing piece 130. When the fixing piece 130 is disposed on the side of the layered heat dissipation structure 100, the plurality of fixing holes 131 may be aligned with the plurality of through holes 111 of the heat dissipation fins 110 and the clip 120. A plurality of positioning holes 121 are formed to form a plurality of through channels on the layered heat dissipation structure 100.

Then, a plurality of coupling members 140 respectively pass through a plurality of through passages formed by the fixing holes 131 of the fixing piece 130, the through holes 111 of the heat dissipation fins 110, and the positioning holes 121 of the clips 120 (as shown in FIG. 3). . The coupling member 140 can be, but is not limited to, a bolt 141 having a first end 1411 and a second end 1412, a first end 1411 of the bolt 141, and a diameter of the nut 142. The diameter of the second end 1412 of the bolt 141 is smaller than the diameters of the fixing hole 131, the through hole 111 and the positioning hole 121, respectively, which are larger than the diameters of the fixing hole 131, the through hole 111 and the positioning hole 121. Therefore, when the coupling member 140 is connected to the fixing piece 130, the heat dissipation fin 110 and the clip 120 by bolts 141, the first end 1411 of the bolt 141 is fastened against the fixing piece 130 on one side of the layered heat dissipation structure 100 ( S103), the second end 1412 of the bolt 141 is exposed outside the fixing piece 130 on the other side of the layered heat dissipation structure 100. The nut 142 is locked to the second end 1412 of the bolt 141 and is attached to the fixing piece 130. Up (S104).

Next, the layered heat dissipation structure 100 is heated (S105), for example, a layered heat dissipation structure 100 is placed in a heating device such as an oven or an oven, and baked at a temperature between 300 ° C and 450 ° C, for example, 350 ° C, so that the heat dissipation fins 110 and the clips 120 are softened by heating, and are easily Deformation occurs under the action of external force. At the same time, since the melting point of the fixing piece 130 is larger than the heat dissipation fins 110 and the clips 120. Therefore, at this heating temperature, the fixing piece 130 does not soften due to the heating action, so that the fixing piece 130 can maintain a certain rigidity without causing structural deformation.

Thereafter, as shown in FIG. 4, when the heat dissipation fins 110 and the clips 120 are still in a softened state, the layered heat dissipation structure 100 is placed in an extrusion die 20, and the second compression plate 210 of the extrusion die 20 is used. The surfaces of the fixing sheets 130 disposed on opposite sides of the layered heat dissipation structure 100 are respectively attached. Then, pressure is applied to the fixing piece 130 by the second pressing plate 210 to press the layered heat dissipation structure 100 by the fixing piece 130 (S106), so that the distance d between the heat dissipation fin 110 and the clip 120 is shortened. Since the position of the fixing piece 130 corresponds to the clip 120, and the fixing piece 130 has a certain rigidity, the pressure applied by the pressing die 20 can be evenly distributed through the fixing piece on the opposite sides of the layered heat dissipating structure. In order to avoid the occurrence of misalignment and skew between the heat dissipation fins and the clip during the process of pressing the layered heat dissipation structure, the surface of the heat dissipation fin 110 and the surface of the clip 120 are mutually pushed and generated. Compressed deformation, and more closely combined with each other.

At the same time, when the heating temperature reaches the melting temperature of the heat dissipating fins 110 and the clips 120, the surface of the heat dissipating fins 110 and the surface of the clips 120 are mutually fused to further enhance the heat dissipating fins 110 and the clips 120. The degree of closeness.

Next, the nut 142 of the coupling member 140 is screwed onto the bolt 141 in the direction of the fixing piece 130, so that the opposite ends of the coupling member 140 (ie, the first end 1411 of the bolt 141) And the nut 142) is respectively abutted against the fixing piece 130, so that the plurality of heat dissipation fins 110, the plurality of clips 120 and the fixing piece 130 (as shown in FIG. 5) are combined by the clamping action of the coupling member 140. It is a whole (S107) to complete the manufacture of the heat sink 10.

According to the manufacturing method of the heat dissipating device described above, when a plurality of heat dissipating fins and a plurality of clips are brought into contact with each other through the steps of heating, pressing, and clamping, the air interface existing between each other can be eliminated, and the plurality of air interfaces can be eliminated. The heat sink fins and the plurality of clips are more closely combined to increase the heat conduction between each other, thereby improving the heat dissipation performance of the heat sink.

Referring to FIG. 6 to FIG. 10 , a method for manufacturing the heat dissipation device 10 according to the second embodiment of the present invention first provides a plurality of heat dissipation fins 110 and a plurality of clips 120 ( S201 ), and the heat dissipation fins 110 . It may be, but is not limited to, a sheet or plate composed of a metal material such as aluminum or copper, and a through hole 111 is formed in the heat dissipation fin 110. The clip 120 can be, but is not limited to, a sheet or sheet of metal material such as aluminum or copper or plastic. In the present embodiment, the sheet composed of the heat dissipation fins 110 is made of copper, and the sheet composed of the clips 120 is made of aluminum as an example, but not limited thereto. In addition, the length of the clip 120 is smaller than the length of the heat dissipation fin 110, and the positioning hole 121 of one of the corresponding through holes 111 is formed on the clip 120, and a flow guiding surface 122 is formed on the opposite sides of the clip 120. Used to guide the flow direction of the airflow.

Then, a plurality of heat dissipation fins 110 and a plurality of clips 120 are interleaved (S202), so that the plurality of clips 120 are interposed between the adjacent two heat dissipation fins 110, and the positioning holes 121 of the clips 120 are aligned to dissipate heat. The perforations 111 of the fins 110. At the same time, since the length of the clip 120 is smaller than the length of the heat dissipation fin 110, the adjacent two The heat dissipating fins 110 have a spacing d (as shown in FIG. 7) which serves as an air flow passage for a gas to flow in the spacing d and/or to exchange heat with the outside air. Therefore, the plurality of heat dissipation fins 110 and the plurality of clips 120 are stacked to form a layered heat dissipation structure 100.

Then, the layered heat dissipation structure 100 is heated (S203), for example, the layered heat dissipation structure 100 is placed in a heating device such as an oven or an oven, and baked at a temperature between 300 ° C and 450 ° C, for example, 300 ° C for baking. Bake, so that the heat dissipation fins 110 and the clips 120 are softened by heating, and are easily deformed by an external force.

Thereafter, as shown in FIG. 8, when the heat dissipation fins 110 and the clips 120 are still in a softened state, the layered heat dissipation structure 100 is placed in an extrusion die 20, and the second compression plate 210 of the extrusion die 20 is used. The heat dissipating fins 110 and the clips 120 are sandwiched between the two plywood plates 210 respectively. Then, along the direction in which the heat dissipation fins 110 and the clips 120 are arranged, the layered heat dissipation structure 100 is pressed by the pressure of the second pressure plate 210 (S204), so that the heat dissipation fins 110 and the clips 120 are pushed tightly by each other. Contacting and causing compression deformation of the surface of the heat dissipation fin 110 and the surface of the clip 120, thereby shortening the distance d between the heat dissipation fin 110 and the clip 120, or when the heat dissipation fin 110 and the clip 120 reach the melting point thereof The temperature causes the surface of the heat dissipation fin 110 to merge with the surface of the clip 120. Therefore, when the adhesion between the heat dissipation fins 110 and the clips 120 is increased by the pressing, and the heat dissipation fins 110 and the clips 120 are attached to each other, between the surface of the heat dissipation fins 110 and the surface of the clips 120 The contained air layer and gap are eliminated, and the seamless fit can be achieved.

It can be understood that although the extrusion step of the layered heat dissipation structure in this embodiment is The extrusion step is performed after the heat dissipation fins and the clips are heated. However, in other embodiments of the present invention, the step of pressing the layered heat dissipation structure may be performed simultaneously with the heating step, for example, in a heating device. There is an extrusion die, so in operation, the layered heat dissipation structure is first clamped on the extrusion die, so that a plurality of heat dissipation fins and a plurality of clips are attached to each other. Then, the layered heat dissipating structure is heated, and when a predetermined heating temperature is reached, for example, 300 ° C, 350 ° C, 375 ° C or 425 ° C, etc., pressure is applied to the opposite sides of the layered heat dissipating structure by an extrusion die. The heat sink fins fit snugly against the clips. In addition, the amount of pressure applied by the extrusion die can also increase as the temperature gradient increases to further increase the tightness between the heat sink fins and the clip.

As shown in FIG. 6, FIG. 9 and FIG. 10, after the pressing step of the layered heat dissipation structure 100 is completed, the layered heat dissipation structure 100 is penetrated by a bonding member 140, thereby sandwiching the layered heat dissipation structure 100 (S205) The combination member 140 may be, but is not limited to, a pin, a pin, or a combination of a bolt and a nut. In the embodiment, the coupling member 140 is used as a pin, but is not limited thereto. . The coupling member 140 includes a rod body 143 and a blocking piece 144. The rod body 143 may be a semi-circular rod body, a square rod body or a combination of a semi-circular rod body and a square rod body, and the diameter of the rod body 143 is substantially The upper surface is equal to the aperture of the through hole 111 of the heat dissipation fin 110 and the aperture of the positioning hole 121 of the clip 120. The blocking piece 144 is disposed at one end of the rod body 143, and the diameter of the blocking piece 144 is larger than the diameter of the through hole 111 of the heat dissipation fin 110 and the diameter of the positioning hole 121 of the clip 120. Therefore, the joint member 140 passes through the through hole 111 of the heat dissipation fin 110 and the positioning hole 121 of the clip 120, so that the other end of the rod body 143 opposite to the blocking piece 144 is exposed on one side of the layered heat dissipation structure 100. And block The sheet 144 is attached to the other side of the layered heat dissipation structure 100.

Then, the other end of the rod 143 is pressed against the other end of the blocking piece 144 by tapping or beating, so that the other end of the rod 143 is deformed relative to the other end of the blocking piece 144, and is pressed against the layered heat dissipating structure 100 with respect to the blocking piece 144. On one side. Therefore, the plurality of heat dissipation fins 110 and the plurality of clips 120 are tightly combined as a whole by the clips of the joint member 140 to complete the fabrication of the heat sink 10.

In the above method for manufacturing a heat dissipating device of the present invention, a plurality of heat dissipating fins and a plurality of clips are heated in the process to soften a plurality of heat dissipating fins and a plurality of clips, and then compressing a plurality of heat dissipating fins The sheet and the plurality of clips are brought into close contact with each other to exclude the air at the joint between the two, or to fuse the surfaces of each other, thereby lifting a plurality of heat sink fins and a plurality of clips The heat transfer between the sheets enhances the heat efficiency of the heat sink.

Although the embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and those skilled in the art, regardless of the spirit and scope of the present invention, the shapes, structures, and features described in the scope of the present application. And the number of modifications may be made, and the scope of patent protection of the present invention shall be determined by the scope of the patent application attached to the specification.

10‧‧‧heating device

100‧‧‧Layered heat dissipation structure

110‧‧‧Heat fins

111‧‧‧Perforation

120‧‧‧ Clips

121‧‧‧Positioning holes

122‧‧ ‧ diversion surface

130‧‧‧Fixed tablets

131‧‧‧Fixed holes

140‧‧‧Connected parts

141‧‧‧ bolt

1411‧‧‧ first end

1412‧‧‧ second end

142‧‧‧ nuts

143‧‧‧ rod body

144‧‧ ‧Flap

20‧‧‧Extrusion mould

210‧‧‧Plywood

Fig. 1 is a flow chart showing a method of manufacturing a heat sink according to a first embodiment of the present invention.

Fig. 2 is a partially exploded perspective view showing the layered heat dissipation structure of the first embodiment of the present invention.

Fig. 3 is a side elevational view showing the layered heat dissipating structure of the first embodiment of the present invention disposed in an extrusion die.

4 is a perspective view showing the sandwiched layered heat dissipation structure of the joint member according to the first embodiment of the present invention; intention.

Fig. 5 is a perspective view showing the heat sink of the first embodiment of the present invention.

Fig. 6 is a flow chart showing a method of manufacturing a heat sink according to a second embodiment of the present invention.

Figure 7 is a partially exploded perspective view showing the layered heat dissipation structure of the second embodiment of the present invention.

Figure 8 is a side elevational view showing the layered heat dissipating structure of the second embodiment of the present invention disposed in an extrusion die.

Figure 9 is a perspective view showing the sandwiched layered heat dissipation structure of the joint member according to the second embodiment of the present invention.

Figure 10 is a perspective view of a heat sink according to a second embodiment of the present invention.

Claims (6)

A method for manufacturing a heat dissipating device includes the steps of: staggering a plurality of heat dissipating fins and a plurality of clips, and spacing adjacent ones of the fins to form a layered heat dissipating structure; wherein each of the clips At least one of the sides of the sheet is formed with a flow guiding surface in the form of a slanted plane or a curved surface; two fixing pieces are disposed on opposite sides of the layered heat dissipating structure, and the positions of the two fixing pieces are corresponding to the clips, The melting point of the fixing piece is larger than the melting point of the heat dissipating fin and the clip; heating the layered heat dissipating structure and the fixing piece to 350 ° C, so that the heat dissipating fin and the clip are heated and softened, and the fixing piece is not generated by heating. Softening; putting the layered heat dissipating structure into an extrusion die having two press plates, and respectively bonding the two plywood plates to the surface of the fixing piece provided on opposite sides of the layered heat dissipating structure; Applying pressure to the fixing piece to press the layered heat dissipating structure by the fixing piece to push the heat dissipating fins and the clips to each other; and clamping the layered heat dissipating structure and the fixing piece, The fixing piece, and such heat dissipation fins of such a clip is integrally incorporated. The method of manufacturing the heat dissipating device of claim 1, wherein the step of clamping the layered heat dissipating structure and the fixing piece comprises: connecting the fixing piece, the heat dissipating fins and the clips in a joint; And clamping the layered heat dissipation structure and the fixing piece with opposite ends of the bonding member. The method of manufacturing a heat sink according to claim 2, wherein the bonding member is The bolts are connected in series with the fixing piece, the heat dissipating fins and the clips, and are fastened to the bolt by a nut, so that one end of the bolt abuts against the fixing piece on one side of the layered heat dissipating structure. And pressing the nut against the other side of the layered heat dissipation structure. The method of manufacturing the heat dissipating device of claim 1, wherein the step of heating the layered heat dissipating structure and the fixing piece further comprises: connecting the heat dissipating fins and the clips in a joint piece, so that The layered heat dissipation structure and the fixing piece are located between opposite ends of the coupling member. The method for manufacturing a heat sink according to claim 1, wherein in the step of clamping the layered heat dissipating structure, the fixing piece, the heat dissipating fins and the clips are combined as a whole. The method of manufacturing a heat sink according to claim 1, wherein in the step of squeezing the layered heat dissipation structure, surfaces of the heat dissipation fins and surfaces of the clips are fused to each other.