WO2015008326A1 - Heat sink and method for manufacturing heat sink - Google Patents

Heat sink and method for manufacturing heat sink Download PDF

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Publication number
WO2015008326A1
WO2015008326A1 PCT/JP2013/069271 JP2013069271W WO2015008326A1 WO 2015008326 A1 WO2015008326 A1 WO 2015008326A1 JP 2013069271 W JP2013069271 W JP 2013069271W WO 2015008326 A1 WO2015008326 A1 WO 2015008326A1
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WO
WIPO (PCT)
Prior art keywords
fin
fins
heat sink
base
punch
Prior art date
Application number
PCT/JP2013/069271
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French (fr)
Japanese (ja)
Inventor
俊彦 矢野
深川　栄生
Original Assignee
三協立山株式会社
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Publication date
Application filed by 三協立山株式会社 filed Critical 三協立山株式会社
Priority to JP2015527078A priority Critical patent/JP6138939B2/en
Priority to PCT/JP2013/069271 priority patent/WO2015008326A1/en
Publication of WO2015008326A1 publication Critical patent/WO2015008326A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4871—Bases, plates or heatsinks
    • H01L21/4882—Assembly of heatsink parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a heat sink and a method for manufacturing the heat sink.
  • heat sinks have been used to cool electric and mechanical parts that generate heat, such as semiconductor elements.
  • the heat sink is generally configured so that a large number of plate-like or columnar fins stand upright from the base.
  • Patent Document 1 a fin base is fitted into a number of grooves provided in a base, and a comb-shaped press punch having a V-shaped tip is pushed in from above, and the base of each fin is fixed by caulking from both sides.
  • the technology to do is described.
  • Patent Document 2 a thin plate fin is inserted into a groove portion, and a thin plate fin mounting surface between adjacent groove portions is plastically deformed so that a cross section having a flat bottom surface and an inclined side surface is tapered into a trapezoidal shape.
  • a technique is described in which a concave portion formed in the above is formed, and a thin plate fin is caulked and joined from both sides by inclined side surfaces.
  • JP 2000-151163 A Japanese Patent No. 352047
  • the fin interval (pitch) cannot be reduced. This is because if the pitch of the fins is narrowed, the punch of the press becomes thin, and as a result, the strength of the punch becomes weak.
  • an object of the present invention is to provide a heat sink capable of narrowing the gap between the fins and a manufacturing method thereof.
  • a heat sink includes a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves.
  • a base end portion of each fin is inserted into each concave groove, and a protruding portion that protrudes toward each fin side is formed only on one convex line of each fin.
  • a heat sink in which the base end portion of each fin is caulked and fixed between the projecting portion of the one ridge of each fin and the side surface of the other ridge of each fin.
  • the heat sink manufacturing method of the present invention includes a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves.
  • caulking or “caulking and fixing” means that the base end portion of the fin is sandwiched between the side surface of the protrusion on the base and the projecting portion, and the projecting portion is engaged with the base end portion of the fin.
  • the fin is integrally fixed to the base by pressing against the side surface.
  • each fin is inserted into each concave groove, and the protruding portion that protrudes toward each fin side is formed only on the one side of each fin.
  • the base end portion of each fin is caulked and fixed between the protruding portion of the convex line on one side of each fin and the side surface of the convex line on the other side of each fin.
  • the punch when manufacturing the heat sink, the punch can be moved in order to another groove located on the one side of the ridge, and the next fin can be inserted and caulked and fixed. Therefore, since it is not necessary to insert a punch between fins, the space
  • FIG. 1 is a perspective view of a heat sink of Example 1.
  • FIG. 1 is a front view of a heat sink of Example 1.
  • FIG. 2 is a plan view of a heat sink according to Embodiment 1.
  • FIG. It is an expanded sectional view which expands and shows the base end part of the fin of the heat sink of Example 1.
  • FIG. It is explanatory drawing which shows the process hold
  • FIG. It is explanatory drawing which shows the process of inserting in the manufacturing process of the heat sink of Example 1.
  • FIG. It is explanatory drawing which shows the process of crimping fixing of the manufacturing process of the heat sink of Example 1.
  • FIG. It is a perspective view which shows the punch front-end
  • the heat sink 1 of the present embodiment includes a base 2 and a plurality of fins 7 fixed to the base 2 substantially perpendicularly.
  • the base 2 is formed in a rectangular plate shape with a metal having good thermal conductivity such as an aluminum alloy or a magnesium alloy.
  • the base 2 includes a first surface that is in close contact with a heat source (not shown), and a second surface on which the plurality of fins 7 are arranged upright.
  • the base 2 may not be a quadrangle, may be another polygon such as an octagon, may be a circle, or may be provided with a fixing hole.
  • the second surface has a plurality of grooves 3 and a plurality of ridges 4 (5) alternately.
  • the plurality of concave grooves 3 and the plurality of ridges 4 (5) extend in parallel to each other from the first side of the quadrangular base 2 to the second side facing each other.
  • the cross section of the groove 3 is formed in a U-shape having a bottom surface and an inner surface facing the bottom surface. More specifically, the cross section of the groove 3 has an inversely tapered shape with a narrow inlet side and a wide bottom side. In other words, at least one inner side surface of the concave groove 3, that is, one side surface 41 in surface contact with the fin 7 is inclined so as to fall slightly closer to the bottom surface than in a direction perpendicular to the base 2. (See FIG. 9).
  • the angle of inclination of the inner surface of the concave groove 3 having the reverse tapered shape is in the range of ⁇ 2 degrees to 0 degrees (see FIGS. 9 and 10). Note that the optimum range of the inclination angle is determined by an experiment shown in Example 2 described later.
  • the ridge 4 (5) has a configuration in which the groove 3 described above is inverted on the second surface of the base 2. That is, the inner surface of the groove 3 described above constitutes the side surface of the ridges 4 and 5.
  • the fin 7 is formed in a rectangular thin plate shape with a metal having good thermal conductivity such as an aluminum alloy or a magnesium alloy.
  • the shape of the fin 7 may not be a quadrangle, and may be a shape with chamfered corners, a shape that is largely cut obliquely, or a shape that has an opening.
  • the thickness of the fin 7 is made thinner than the width of the concave groove 3.
  • each fin 7 is inserted into each concave groove 3 and only the convex strip 5 on one side (right side in FIG. 4) of each fin 7 Protruding protrusions 51 are formed, and the base ends 71 of the fins 7 are the protrusions 51 of the protrusions 5 on one side of the fins 7 and the protrusions on the other side (left side in FIG. 4) of the fins 7. It is caulked and fixed between the four side surfaces 41.
  • the side surface 41 of the other ridge 4 is in full contact with the first side surface of the base end portion 71 of each fin 7 and the protrusion 51 of the ridge 5 on one side is each fin. 7 is engaged with the second side surface of the base end portion 71 so as to partially contact the second side surface.
  • the protrusion 51 is formed by plastically deforming the protrusion 5 having a predetermined width into a flat shape by pressing approximately half of the width of the protrusion 5 near the fin 7 on the base 2 substantially perpendicularly. To do.
  • line 5 has a predetermined width
  • the protruding portion 51 of the one side ridge 5 is formed intermittently (discontinuously) at intervals along the extending direction of the ridge 5.
  • the base end portion 71 of the fin 7 is intermittently caulked and fixed along the extending direction of the groove 3.
  • the protruding portion 51 on which the protruding portion 51 is formed has a portion that is not formed with the protruding portion 51 and does not contact the fin 7.
  • the present invention is not limited to this.
  • the method of manufacturing the heat sink 1 of the present embodiment includes a preparing step, a holding step, an inserting step, and a caulking and fixing step.
  • the holding step, the inserting step, and the caulking and fixing step are repeatedly performed on each fin 7 to fix the plurality of fins 7 to the base 2.
  • a base 2 in which a plurality of concave grooves 3 and a plurality of ridges 4, 5 are alternately provided, and a plurality of fins 7 formed in a plate shape thinner than the groove width of the concave grooves 3, prepare.
  • the configurations of the base 2 and the fins 7 are as described above.
  • the base 2 is set on a press stand (not shown), and a plurality of fins 7 are arranged so as to be easily obtained one by one.
  • each fin 7 is held in a state of protruding from the punch tip 82 by the punch 8 having holding means 81 for holding the fin 7 slidably.
  • the holding means 81 of the punch 8 preferably sucks the fin 7 by sucking air inside the suction cup provided on the surface of the punch 8, but is not limited to this, and holds the fin 7 slidably. If it is.
  • a mechanical holding method or a magnetic holding method can be employed.
  • the punch tip 82 has protruding claws 82 a and notches 82 b alternately so that the ridges 5 can be pressed intermittently (discontinuously).
  • the member thickness of the punch 8 can be made wider than the interval between the adjacent fins 7 in order to increase the strength.
  • the punch 8 holding each fin 7 is moved toward the base 2, and the base end portion 71 of each fin 7 is inserted into each groove 3. After the time when the tips of the fins 7 are in contact with the bottom of the concave groove 3, a caulking and fixing process described below is performed.
  • the controller determines that the caulking is completed, and the slide movement (lowering) of the punch 8 is finished.
  • the punch 8 moves away from the base 2 and moves for the process of holding the next fin 7, the process of inserting, and the process of fixing by caulking.
  • the punch 8 is moved in order to another groove 3 positioned on the side of the ridge 5 on one side that has been crushed.
  • the protruding ridges 5 on one side are intermittently crushed at intervals along the extending direction of the protruding ridges 5 by the discontinuous protruding claws 82a of the punch tip 82, The base end portion 71 of the fin 7 is intermittently caulked and fixed.
  • the fin b is caulked and fixed as follows. That is, first, as shown in FIG. 7A, the upper surface of the fin b arranged on the base a is pressed by the fin pressing block c. Next, as shown in FIG. 7B, the tip of the punch is brought closer to the V-shaped groove formed in the base a. Finally, as shown in FIG. 7C, the tip end of the punch is pushed into the V-shaped groove, and the base end portion of the fin b is caulked and fixed.
  • the thickness of the base a varies depending on the position, for example, when the thickness is thick at the center and thin at the periphery, the upper surfaces of the peripheral fins b2 and b3 are pressed by the fin press block c. I can't.
  • the peripheral fins b2 and b3 are fixed by caulking in a state where the fins b2 and b3 are floated or tilted, and there is a possibility that they cannot be fixed with sufficient strength.
  • the heat sink 1 of the present embodiment includes a base 2 in which a plurality of concave grooves 3 and a plurality of convex strips 4 and 5 are alternately provided, and a plurality of plates formed thinner than the groove width of the concave grooves 3.
  • the heat sink 1 is provided with a fin 7. And while the base end part 71 of each fin 7 is inserted in each concave groove 3, the protrusion part 51 which protrudes in each fin 7 side is formed only in the protruding item
  • the next fin 7 can be inserted and caulked and fixed by sequentially moving the punch 8 to the other groove 3 positioned on the one side of the ridge 5 side. Therefore, since it is not necessary to insert the punch 8 between the fins 7, the arrangement interval of the fins 7 can be narrowed.
  • the heat sink 1 having excellent cooling performance can be obtained by reducing the arrangement interval of the fins 7, increasing the height of the fins 7, and efficiently performing heat transfer from the base 2 to the fins 7. .
  • the caulking load per press can be reduced by caulking and fixing the fins 7 one by one. Therefore, the manufacturing apparatus can be downsized and the initial investment can be reduced.
  • the protruding portion 51 of the protruding ridge 5 on one side is formed intermittently at intervals along the extending direction of the protruding ridge 5, and the base end portion 71 of the fin 7 extends in the extending direction of the recessed groove 3. , The caulking load per press can be further reduced.
  • the necessary load was 180 t.
  • the necessary load is 0.8 t. Therefore, the apparatus can be miniaturized and the initial investment can be reduced.
  • the manufacturing method of the heat sink 1 of a present Example is plate-shaped thinner than the groove
  • the punch 8 is sequentially moved to another groove 3 positioned on the one side of the crushed ridge 5, and the step of inserting the next fin 7 and the step of fixing by caulking are performed.
  • the fins 7 are fixed one by one, the fin arrangement interval and fin thickness can be easily changed in the same product. That is, even if the fin arrangement interval or the fin thickness changes, the same punch 8 can be used without changing the setup.
  • the fin holding block c since the fin holding block c is not used, the fin 7 can be fixed to the base 2 with sufficient strength without being affected by variations in the height of the fin b and the thickness of the base a. .
  • the base end portion 71 of the fin 7 is intermittently caulked and fixed by intermittently crushing the protruding ridges 5 on one side at intervals along the extending direction of the ridges 5. can do. Therefore, the caulking load per press can be reduced.
  • the lateral length of the punch 8 is shorter than the lateral length of the fin 7, and the step of caulking and fixing is performed in a plurality of times in the extending direction of the ridge 5.
  • the caulking load per press can be further reduced.
  • the inclination angle ⁇ of the fin 7 is defined using FIG.
  • the inclination angle ⁇ is defined as a negative (minus) value when the entrance side is a narrow reverse taper, and ⁇ is defined as a positive (plus) value when the entrance side is a wide positive taper.
  • ⁇ ⁇ 0 when the inner surface of the groove 3 is tilted toward the bottom of the groove 3.
  • a concave groove 3 having a depth of 2.5 mm was formed on a base having a width of 120 mm and a length of 100 mm.
  • a fin 7 having a height of 100 mm was inserted into the concave groove 3 and fixed by caulking, and a positional deviation amount (mm) at the tip of the fin height 100 mm was measured to obtain an inclination.
  • Table 1 and FIG. 10 show the experimental results.
  • Table 1 and FIG. 10 show the inclination at a fin height of 100 mm measured in a groove angle range of ⁇ 2 ° to 2 °.
  • the cross-section of the concave groove 3 is formed in a U-shape, and the fin 7 is formed by the reverse taper shape in which the inlet side is narrow and the bottom side is wide. It becomes possible to fix almost vertically.
  • the fins 7 When the fins 7 are caulked and fixed in such a tapered groove 3, the fins 7 are inclined in response to the inclination.
  • the inner surface of the groove 3 is tilted in advance and designed in a reverse taper shape to prevent the taper shape.
  • the inner surface of the groove 3 may fall inward too much.
  • the fin 7 inserted at an angle is pushed back by the upper side surface of the punch 8 in the caulking and fixing step. Therefore, the inclination of the fin 7 can be suppressed.
  • the inclination angle ⁇ of the inner surface of the concave groove 3 having the reverse taper shape is set in the range of ⁇ 2 ° to 0 °, so that the inclination of the fin 7 can be minimized.
  • the amount of positional deviation at the tip of the fin 7 can be reduced.
  • heat sinks 1A to 1H having different forms from the first and second embodiments will be described with reference to FIGS.
  • subjects the same code
  • the heat sinks 1A to 1H of the present embodiment have the basic configuration of the heat sink 1 described in the first embodiment. That is, the heat sinks 1A to 1H of the present embodiment were formed in a plate shape thinner than the groove width of the groove 2 and the base 2 in which the plurality of grooves 3 and the plurality of ridges 4, 5 were alternately provided. And a plurality of fins 7. And while the base end part 71 of each fin 7 (7A, 7B, 7C, 7D, 7E) is inserted in each concave groove 3, only the convex strip 5 of one side of each fin 7 is on each fin 7 side.
  • Protruding protrusions 51 are formed, and the base ends 71 of the fins 7 are formed between the protrusions 51 of the protrusions 5 on one side of the fins 7 and the side surfaces 41 of the protrusions 4 on the other side of the fins 7. It is fixed in between.
  • the heat sinks 1A to 1H of the present embodiment have the following characteristics in addition to the basic configuration.
  • FIG. 11A and 11B is another embodiment in which a step is provided at the upper end of the fin 7.
  • FIG. 11A is an example in which the temperature is made uniform corresponding to the heat sources 91 and 92.
  • the plurality of fins 7 are composed of high fins 7A and low fins 7B.
  • the group of high fins 7A and the group of low fins 7B are separately arranged corresponding to the heat generation amounts of the heat sources 91 and 92. That is, the high fins 7A are arranged on the back side of the heat source 91 that generates a large amount of heat, and the low fins 7B are arranged on the back side of the heat source 92 that generates a small amount of heat.
  • FIG. 11B is an example in which interference with other parts 93 is avoided.
  • the plurality of fins 7 are composed of high fins 7A and low fins 7B.
  • a group of high fins 7A and a group of low fins 7B are separately arranged so as to avoid interference with other components 93 above the base 2. That is, the low fins 7B are arranged on the side where the other parts 93 are present, and the high fins 7A are arranged on the side where the other parts 93 are not present.
  • the plurality of fins 7 are composed of high fins 7A and low fins 7B. And the staggered unevenness
  • a fan 94 is installed above the envelope surface on which the staggered irregularities are formed.
  • the heat sink 1H shown in FIG. 13 is another embodiment in which a step-like slope is provided on the envelope surface of the upper end of the fin 7 as the height of the fin 7 gradually changes.
  • the plurality of fins 7 are constituted by fins 7 having different heights from a high fin 7 to a low fin 7. Then, by arranging the fins 7 on the base 2 in order from the high fins 7 to the low fins 7, a step-like slope is provided on the envelope surfaces at the upper ends of the plurality of fins 7.
  • a heat sink 1C shown in FIG. 14 is another embodiment in which the base 2 is partially thick. That is, when the heat source 91 is fixed to the base 2 with the screws 61, 61, the thick portion 6 is provided on the surface of the base 2 on the side where the fins 7 are arranged in order to secure the length of the screw hole. And the fin 7 of the thick part 6 is shortened, and the upper surface of the fin 7 is arrange
  • 15 is another embodiment in which thick fins 7C and thin fins 7D are combined. That is, the thick fin 7C is disposed on the outermost side, and the thin fin 7D is disposed on the inner side.
  • the interval between the fins 7 is different depending on the position in the base 2. That is, the arrangement interval of the fins 7 is made close at a portion close to the heat source 91, and the arrangement interval of the fins 7 is made sparse at a portion far from the heat source 91.
  • the arrangement interval can be changed while changing the thickness of the fin.
  • the thickness of the outermost fins can be increased, and the fins can be arranged closer to the heat source.
  • the fin 7 has two bead portions 72, 72.
  • the bead portion 72 is a belt-like thin protrusion and is formed by embossing or the like.
  • the bead portion 72 extends to a height of more than half from the proximal end 71 side of the fin 7 toward the distal end side.
  • the number of beads and the arrangement direction are not limited to this embodiment.
  • the number of bead portions may be one or five, may be arranged in the horizontal direction, or may be arranged in an oblique direction.
  • the embossed portion 73 is a circular thin protrusion, and is formed by embossing or the like.
  • the embossed portions 73 are arranged on the entire surface of the fin 7 in a substantially staggered manner. The shape, number, and arrangement of the embossed portion 73 are not limited to the present embodiment.
  • the plurality of fins of the heat sink 1 ⁇ / b> A are composed of high fins 7 ⁇ / b> A and low fins 7 ⁇ / b> B, and steps are formed on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, the temperature can be made uniform by changing the height of the fins 7 according to the heat sources 91 and 92. Furthermore, even if another component 93 exists above the base 2, it can be easily avoided.
  • the plurality of fins of the heat sink 1 ⁇ / b> B are composed of high fins 7 ⁇ / b> A and low fins 7 ⁇ / b> B, and staggered irregularities are formed on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, when the fan 94 is installed above the fins 7A and 7B, clogging can be reduced.
  • the plurality of fins 7 of the heat sink 1H are configured by fins 7 having different heights from the high fins 7 to the low fins 7, and a step-like slope is provided on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, when a fan (not shown) is arrange
  • the base 2 of the heat sink 1C has a thick portion 6 protruding out of the surface from the surface on which the plurality of fins 7 are arranged in order to attach the fixing screw 61 of the heat source 91. Even if the thick portion 6 is provided in this way, it can be formed in a flat surface without causing a step on the envelope surface at the upper end of the fin 7 by partially reducing the height of the fin 7.
  • the plurality of fins 7 of the heat sink 1D are composed of thick fins 7C and thin fins 7D. For this reason, it becomes the heat sink 1 with the required strength and excellent cooling efficiency.
  • the fin 7E of the heat sink 1F has at least one bead portion 72. For this reason, the rigidity of the fin 7E can be improved. Thereby, even if the fin 7E is formed thin, it is possible to prevent the fin 7E from resonating.
  • the fin 7F of the heat sink 1G has at least one embossed portion 73. For this reason, the rigidity of the fin 7F can be improved. Thereby, even if the fin 7F is formed thin, it is possible to prevent the fin 7F from resonating.
  • the heat sinks 1A to 1H of the present embodiment have various features.
  • Such heat sinks 1A to 1H can be realized by having the basic configuration shown in the first embodiment.
  • the thermal characteristics were calculated in the same manner as in Example 2 assuming that the fin 7 having a height of 100 mm was inserted into the base having a width of 120 mm and a length of 100 mm and fixed by caulking.
  • the relationship between the wind speed and the thermal resistance was also calculated under conditions corresponding to the heat sink 11 of the prior art (see Patent Documents 1 and 2).
  • the heat sink 1 of the present embodiment and the heat sink 11 of the prior art (fin interval (mm), fin thickness (mm), number of fins) are (1.9, 1.2, 38), (3.2), respectively. 0.8, 29).
  • the fin interval (mm) refers to the distance between the surfaces of the fins 7.
  • FIG. 19 shows a calculated value (K / W) of thermal resistance from a wind speed of 0.5 (m / s) to 5.0 (m / s).
  • the heat sink 1 of this embodiment has superior thermal characteristics as compared to the heat sink 11 of the prior art. Specifically, when the wind speed is 3 m / s, the characteristics are improved by about 35% compared to the heat sink 11 of the prior art.
  • the present invention is not limited to this, and when the concave groove can be formed with almost no error, The side can also be designed vertically.
  • the case where the fins 7 are caulked and fixed in one direction to the base 2 has been described.
  • all the fins 7 can be caulked and fixed in one direction.
  • half the fins 7 can be caulked and fixed toward the one side from the center of the base 2, and the base 2 can be reversed and the remaining half of the fins 7 can be caulked and fixed.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

This invention provides a heat sink and a manufacturing method therefor in which a fin spacing can be reduced. Said heat sink (1) is provided with a base (2) on which a plurality of alternating grooves (3) and ridges (4, 5) are provided and a plurality of fins (7) consisting of plates that are thinner than the grooves (3) are wide. For each fin (7) of this heat sink (1), a base section (71) of said fin (7) is inserted into a groove (3), a protrusion (51) that protrudes toward said fin (7) is formed on the ridge (5) on one side thereof, and the base section (71) of said fin (7) is fixed in place by being swaged between the aforementioned protrusion (51) and the side surface (41) of the ridge (4) on the other side of said fin (7).

Description

ヒートシンク及びヒートシンクの製造方法Heat sink and heat sink manufacturing method
　本発明は、ヒートシンク及びヒートシンクの製造方法に関するものである。 The present invention relates to a heat sink and a method for manufacturing the heat sink.
　従来から、半導体素子などの発熱する電気部品・機械部品を冷却するために、ヒートシンクが使用されている。ヒートシンクは、一般に、多数の板状又は柱状のフィンがベースから直立するように構成されている。 Conventionally, heat sinks have been used to cool electric and mechanical parts that generate heat, such as semiconductor elements. The heat sink is generally configured so that a large number of plate-like or columnar fins stand upright from the base.
　ヒートシンクの製造方法として、板状に形成された各フィンの基端部を、ベースに形成された溝に挿入し、溝を両側からかしめることによって、フィンをベースに固定する方法が知られている。 As a method of manufacturing a heat sink, a method of fixing the fin to the base by inserting the base end portion of each fin formed in a plate shape into a groove formed in the base and caulking the groove from both sides is known. Yes.
　例えば、特許文献１には、ベースに設けた多数の溝にフィンの基部を嵌め込み、上方からＶ字状先端を有する櫛歯状のプレスのパンチを押し込んで、各フィンの基部を両側からかしめ固定する技術が記載されている。 For example, in Patent Document 1, a fin base is fitted into a number of grooves provided in a base, and a comb-shaped press punch having a V-shaped tip is pushed in from above, and the base of each fin is fixed by caulking from both sides. The technology to do is described.
　同様に、特許文献２には、溝部に薄板フィンを挿入し、隣接する溝部の間の薄板フィン取付面を塑性変形することによって、平らな底面及び傾斜した側面を有する断面が概ね台形状に先細りに形成された凹部が形成され、薄板フィンが傾斜した側面によって両側からかしめ接合される技術が記載されている。 Similarly, in Patent Document 2, a thin plate fin is inserted into a groove portion, and a thin plate fin mounting surface between adjacent groove portions is plastically deformed so that a cross section having a flat bottom surface and an inclined side surface is tapered into a trapezoidal shape. A technique is described in which a concave portion formed in the above is formed, and a thin plate fin is caulked and joined from both sides by inclined side surfaces.
特開２０００－１５１１６３号公報JP 2000-151163 A 特許第３５５２０４７号公報Japanese Patent No. 352047
　しかしながら、上述したような従来の製造方法では、フィンの間隔（ピッチ）を狭くすることができなかった。なぜなら、フィンのピッチを狭くするとプレスのパンチが薄くなる結果、パンチの強度が弱くなるためである。 However, in the conventional manufacturing method as described above, the fin interval (pitch) cannot be reduced. This is because if the pitch of the fins is narrowed, the punch of the press becomes thin, and as a result, the strength of the punch becomes weak.
　そこで、本発明は、フィンの間隔を狭くすることができるヒートシンク及びその製造方法を提供することを目的としている。 Therefore, an object of the present invention is to provide a heat sink capable of narrowing the gap between the fins and a manufacturing method thereof.
　前記目的を達成するために、本発明のヒートシンクは、複数の凹溝及び複数の凸条が交互に設けられたベースと、前記凹溝の溝幅よりも薄い板状に形成された複数のフィンと、を備えるヒートシンクであって、各凹溝内に各フィンの基端部が挿入されるとともに、前記各フィンの一方側の凸条のみに前記各フィン側に突出する突出部が形成されて、前記各フィンの基端部が、前記各フィンの一方側の凸条の前記突出部と前記各フィンの他方側の凸条の側面との間でかしめ固定されてなる、ヒートシンクである。 In order to achieve the above object, a heat sink according to the present invention includes a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves. A base end portion of each fin is inserted into each concave groove, and a protruding portion that protrudes toward each fin side is formed only on one convex line of each fin. A heat sink in which the base end portion of each fin is caulked and fixed between the projecting portion of the one ridge of each fin and the side surface of the other ridge of each fin.
　また、本発明のヒートシンクの製造方法は、複数の凹溝及び複数の凸条が交互に設けられたベースと、前記凹溝の溝幅よりも薄い板状に形成された複数のフィンと、を準備する工程と、フィンをスライド可能に保持する保持手段を有するパンチによって、各フィンをパンチ先端から突出した状態で保持する工程と、前記各フィンを保持している前記パンチを前記ベースに向かって移動させ、前記各フィンの基端部を前記各凹溝内に挿入する工程と、前記パンチのみを前記ベースに向かってスライド移動させ、前記パンチ先端で前記各フィンの一方側の前記凸条のみを押しつぶすことによって、前記フィン側に突出する突出部を形成し、前記フィンの基端部をかしめ固定する工程と、を含み、前記保持する工程、前記挿入する工程、及び前記かしめ固定する工程を各フィンに対して繰り返し実施して、前記複数のフィンを前記ベースに固定する。 The heat sink manufacturing method of the present invention includes a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves. A step of preparing, a step of holding each fin in a state of protruding from the tip of the punch by a punch having holding means for slidably holding the fin, and the punch holding the fin toward the base And a step of inserting a base end portion of each fin into each concave groove, and sliding only the punch toward the base, and only the ridges on one side of the fins at the tip of the punch. Forming a projecting portion projecting toward the fin side by crushing, and caulking and fixing a base end portion of the fin, and holding, inserting, and A step of caulking fixed repeatedly performed for each fin, to fix the plurality of fins on the base.
　なお、本明細書において「かしめる」又は「かしめ固定する」とは、フィンの基端部をベースの凸条の側面と突出部とによって挟み、突出部をフィンの基端部に噛み込ませるとともに側面に押し付けて、フィンをベースに一体的に固定することを意味するものとして定義する。 In this specification, “caulking” or “caulking and fixing” means that the base end portion of the fin is sandwiched between the side surface of the protrusion on the base and the projecting portion, and the projecting portion is engaged with the base end portion of the fin. In addition, it is defined as meaning that the fin is integrally fixed to the base by pressing against the side surface.
　このように、本発明のヒートシンクは、各凹溝内に各フィンの基端部が挿入されるとともに、各フィンの一方側の凸条のみに各フィン側に突出する突出部が形成されて、各フィンの基端部が、各フィンの一方側の凸条の突出部と各フィンの他方側の凸条の側面との間でかしめ固定されている。 Thus, in the heat sink of the present invention, the base end portion of each fin is inserted into each concave groove, and the protruding portion that protrudes toward each fin side is formed only on the one side of each fin. The base end portion of each fin is caulked and fixed between the protruding portion of the convex line on one side of each fin and the side surface of the convex line on the other side of each fin.
　この構成によれば、ヒートシンクを製造する際に、パンチを一方側の凸条の側に位置する別の凹溝に順に移動させて、次のフィンを挿入・かしめ固定できる。したがって、フィンどうしの間にパンチを挿入する必要がないため、フィンの間隔を狭くできる。 According to this configuration, when manufacturing the heat sink, the punch can be moved in order to another groove located on the one side of the ridge, and the next fin can be inserted and caulked and fixed. Therefore, since it is not necessary to insert a punch between fins, the space | interval of a fin can be narrowed.
実施例１のヒートシンクの斜視図である。1 is a perspective view of a heat sink of Example 1. FIG. 実施例１のヒートシンクの正面図である。1 is a front view of a heat sink of Example 1. FIG. 実施例１のヒートシンクの平面図である。2 is a plan view of a heat sink according to Embodiment 1. FIG. 実施例１のヒートシンクのフィンの基端部を拡大して示す拡大断面図である。It is an expanded sectional view which expands and shows the base end part of the fin of the heat sink of Example 1. FIG. 実施例１のヒートシンクの製造工程の保持する工程を示す説明図である。It is explanatory drawing which shows the process hold | maintained of the manufacturing process of the heat sink of Example 1. FIG. 実施例１のヒートシンクの製造工程の挿入する工程を示す説明図である。It is explanatory drawing which shows the process of inserting in the manufacturing process of the heat sink of Example 1. FIG. 実施例１のヒートシンクの製造工程のかしめ固定する工程を示す説明図である。It is explanatory drawing which shows the process of crimping fixing of the manufacturing process of the heat sink of Example 1. FIG. プレスのパンチ先端部を示す斜視図である。It is a perspective view which shows the punch front-end | tip part of a press. 従来のヒートシンクの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the conventional heat sink. 従来のヒートシンクの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the conventional heat sink. 従来のヒートシンクの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the conventional heat sink. 従来のヒートシンクの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the conventional heat sink. 凹溝の内側面の傾斜角度を定義する説明図である。It is explanatory drawing which defines the inclination-angle of the inner surface of a ditch | groove. 凹溝の傾斜角度とフィンの傾きとの関係を示すグラフである。It is a graph which shows the relationship between the inclination-angle of a ditch | groove, and the inclination of a fin. フィンの上端に段差を設けた別の実施形態である。熱源に対応して温度の均一化を図った例である。It is another embodiment which provided the level | step difference in the upper end of a fin. This is an example in which the temperature is made uniform corresponding to the heat source. フィンの上端に段差を設けた別の実施形態である。他部品との干渉を回避した例である。It is another embodiment which provided the level | step difference in the upper end of a fin. This is an example of avoiding interference with other parts. フィンの上端に千鳥状の凹凸を設けた別の実施形態である。It is another embodiment which provided the staggered unevenness | corrugation in the upper end of the fin. フィンの上端の高さを徐々に変えて階段状に形成した別の実施形態である。It is another embodiment formed in steps by gradually changing the height of the upper end of the fin. ベースを部分的に厚く形成した別の実施形態である。It is another embodiment which formed the base partially thickly. 厚いフィンと薄いフィンとを組み合わせた別の実施形態である。It is another embodiment which combined the thick fin and the thin fin. フィンの間隔がベース内の位置によって異なる別の実施形態である。It is another embodiment from which the space | interval of a fin changes with positions in a base. フィンがビード部を有する別の実施形態である。4 is another embodiment in which the fin has a bead portion. フィンがエンボス部を有する別の実施形態である。It is another embodiment in which a fin has an embossed part. 本発明のヒートシンクの熱特性を示すグラフである。It is a graph which shows the thermal characteristic of the heat sink of this invention.
　以下、本発明の実施の形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
（構成）
　まず、図１～４を用いて、本実施例のヒートシンク１の構成を説明する。本実施例のヒートシンク１は、ベース２と、ベース２に略垂直に固定される複数のフィン７と、を備えている。 (Constitution)
First, the configuration of the heat sink 1 of this embodiment will be described with reference to FIGS. The heat sink 1 of the present embodiment includes a base 2 and a plurality of fins 7 fixed to the base 2 substantially perpendicularly.
　ベース２は、アルミニウム合金やマグネシウム合金などの熱伝導性の良好な金属によって、四角形の板状に形成されている。ベース２は、熱源（不図示）と密着する第１の面と、複数のフィン７が直立配置される第２の面と、を備えている。なお、ベース２は、四角形でなくてもよく、八角形などの他の多角形であってもよいし、円形であってもよいし、固定用の穴が設けられていてもよい。 The base 2 is formed in a rectangular plate shape with a metal having good thermal conductivity such as an aluminum alloy or a magnesium alloy. The base 2 includes a first surface that is in close contact with a heat source (not shown), and a second surface on which the plurality of fins 7 are arranged upright. The base 2 may not be a quadrangle, may be another polygon such as an octagon, may be a circle, or may be provided with a fixing hole.
　第２の面は、複数の凹溝３及び複数の凸条４（５）を交互に有している。これらの複数の凹溝３及び複数の凸条４（５）は、四角形のベース２の第１の辺から向かい合う第２の辺まで、互いに平行に延びている。 The second surface has a plurality of grooves 3 and a plurality of ridges 4 (5) alternately. The plurality of concave grooves 3 and the plurality of ridges 4 (5) extend in parallel to each other from the first side of the quadrangular base 2 to the second side facing each other.
　図４の拡大図に示すように、凹溝３の断面は、底面と対向する内側面とを有するコ字状（Ｕ字状）に形成されている。詳細にいうと、凹溝３の断面は、入口側が狭く、かつ、底側が広い、逆テーパ形状にされている。換言すると、凹溝３の少なくとも一方の内側面、すなわちフィン７と面接触する一方の側面４１は、ベース２に対して垂直な方向よりも、若干だけ、底面寄りに倒れるように傾斜している（図９参照）。 As shown in the enlarged view of FIG. 4, the cross section of the groove 3 is formed in a U-shape having a bottom surface and an inner surface facing the bottom surface. More specifically, the cross section of the groove 3 has an inversely tapered shape with a narrow inlet side and a wide bottom side. In other words, at least one inner side surface of the concave groove 3, that is, one side surface 41 in surface contact with the fin 7 is inclined so as to fall slightly closer to the bottom surface than in a direction perpendicular to the base 2. (See FIG. 9).
　この逆テーパ形状にされた凹溝３の内側面の傾斜角度は、－２度から０度の範囲にされることが好ましい（図９、１０参照）。なお、この傾斜角度の最適範囲は、後述する実施例２に示す実験によって決められている。 It is preferable that the angle of inclination of the inner surface of the concave groove 3 having the reverse tapered shape is in the range of −2 degrees to 0 degrees (see FIGS. 9 and 10). Note that the optimum range of the inclination angle is determined by an experiment shown in Example 2 described later.
　凸条４（５）は、ベース２の第２の面において、前述した凹溝３を反転させた構成である。すなわち、前述した凹溝３の内側面は、凸条４、５の側面を構成する。 The ridge 4 (5) has a configuration in which the groove 3 described above is inverted on the second surface of the base 2. That is, the inner surface of the groove 3 described above constitutes the side surface of the ridges 4 and 5.
　フィン７は、アルミニウム合金やマグネシウム合金などの熱伝導性の良好な金属によって、四角形の薄い板状に形成されている。なお、フィン７の形状は、四角形でなくてもよく、角を面取りした形状や、大きく斜めにカットした形状や、開口を有する形状などであってもよい。フィン７の厚さは、凹溝３の幅よりも薄くされている。 The fin 7 is formed in a rectangular thin plate shape with a metal having good thermal conductivity such as an aluminum alloy or a magnesium alloy. In addition, the shape of the fin 7 may not be a quadrangle, and may be a shape with chamfered corners, a shape that is largely cut obliquely, or a shape that has an opening. The thickness of the fin 7 is made thinner than the width of the concave groove 3.
　そして、本実施例では、各凹溝３内に各フィン７の基端部７１が挿入されるとともに、各フィン７の一方側（図４では右側）の凸条５のみに各フィン７側に突出する突出部５１が形成されて、各フィン７の基端部７１が、各フィン７の一方側の凸条５の突出部５１と各フィン７の他方側（図４では左側）の凸条４の側面４１との間でかしめ固定されている。 In this embodiment, the base end portion 71 of each fin 7 is inserted into each concave groove 3 and only the convex strip 5 on one side (right side in FIG. 4) of each fin 7 Protruding protrusions 51 are formed, and the base ends 71 of the fins 7 are the protrusions 51 of the protrusions 5 on one side of the fins 7 and the protrusions on the other side (left side in FIG. 4) of the fins 7. It is caulked and fixed between the four side surfaces 41.
　より詳細にいうと、他方側の凸条４の側面４１が各フィン７の基端部７１の第１の側面に全面的に接触するとともに、一方側の凸条５の突出部５１が各フィン７の基端部７１の第２の側面に噛み込んで部分的に接触するようになっている。 More specifically, the side surface 41 of the other ridge 4 is in full contact with the first side surface of the base end portion 71 of each fin 7 and the protrusion 51 of the ridge 5 on one side is each fin. 7 is engaged with the second side surface of the base end portion 71 so as to partially contact the second side surface.
　突出部５１は、所定幅の凸条５において、凸条５のフィン７寄りの幅の半分程度の部分を、ベース２に対して略垂直に押圧することによって、扁平に塑性変形させることによって形成する。なお、凸条５は、押圧した際にフィン７と面接触する他方の側面が塑性変形しない程度の所定幅を有することが好ましい。 The protrusion 51 is formed by plastically deforming the protrusion 5 having a predetermined width into a flat shape by pressing approximately half of the width of the protrusion 5 near the fin 7 on the base 2 substantially perpendicularly. To do. In addition, it is preferable that the protruding item | line 5 has a predetermined width | variety of the grade which the other side surface which is in surface contact with the fin 7 does not plastically deform when pressed.
　また、図３に示すように、平面内では、一方側の凸条５の突出部５１は、凸条５の延長方向に沿って間隔をあけて断続的（不連続的）に形成されて、フィン７の基端部７１が凹溝３の延長方向に沿って断続的にかしめ固定されている。逆に言うと、突出部５１が形成される一方側の凸条５には、突出部５１が形成されずにフィン７と接触しない部分が残されている。 In addition, as shown in FIG. 3, in the plane, the protruding portion 51 of the one side ridge 5 is formed intermittently (discontinuously) at intervals along the extending direction of the ridge 5. The base end portion 71 of the fin 7 is intermittently caulked and fixed along the extending direction of the groove 3. In other words, the protruding portion 51 on which the protruding portion 51 is formed has a portion that is not formed with the protruding portion 51 and does not contact the fin 7.
　なお、本実施例では、ベース２の全面にフィン７を設ける場合について説明したが、これに限定されるものではない。例えば、熱源のある位置のみに局所的にフィン７を設けてもよい。
（本実施例の製造方法） In this embodiment, the case where the fins 7 are provided on the entire surface of the base 2 has been described. However, the present invention is not limited to this. For example, you may provide the fin 7 locally only in the position with a heat source.
(Production method of this example)
　次に、図５Ａ～５Ｃ、６を参照して、本実施例のヒートシンク１の製造方法について説明する。以下に述べるように、本実施例のヒートシンク１の製造方法は、準備する工程と、保持する工程と、挿入する工程と、かしめ固定する工程と、を含んでいる。 Next, a method for manufacturing the heat sink 1 of this embodiment will be described with reference to FIGS. 5A to 5C and 6. FIG. As described below, the method of manufacturing the heat sink 1 of the present embodiment includes a preparing step, a holding step, an inserting step, and a caulking and fixing step.
　このうち、保持する工程、挿入する工程、及びかしめ固定する工程を、各フィン７に対して繰り返し実施して、複数のフィン７をベース２に固定する。 Of these, the holding step, the inserting step, and the caulking and fixing step are repeatedly performed on each fin 7 to fix the plurality of fins 7 to the base 2.
　準備する工程では、複数の凹溝３及び複数の凸条４、５が交互に設けられたベース２と、凹溝３の溝幅よりも薄い板状に形成された複数のフィン７と、を準備する。このベース２及びフィン７の構成は、前述したとおりである。そして、ベース２をプレス台（不図示）に設置するとともに、複数のフィン７を１枚ずつ取得しやすいように並べておく。 In the step of preparing, a base 2 in which a plurality of concave grooves 3 and a plurality of ridges 4, 5 are alternately provided, and a plurality of fins 7 formed in a plate shape thinner than the groove width of the concave grooves 3, prepare. The configurations of the base 2 and the fins 7 are as described above. Then, the base 2 is set on a press stand (not shown), and a plurality of fins 7 are arranged so as to be easily obtained one by one.
　保持する工程では、図５Ａに示すように、フィン７をスライド可能に保持する保持手段８１を有するパンチ８によって、各フィン７をパンチ先端８２から突出した状態で保持する。 In the holding step, as shown in FIG. 5A, each fin 7 is held in a state of protruding from the punch tip 82 by the punch 8 having holding means 81 for holding the fin 7 slidably.
　ここで、プレスのパンチ８の構成について説明する。パンチ８の保持手段８１は、パンチ８の表面に設けた吸盤内部の空気を吸引することによって、フィン７を吸引する方式が好ましいが、これに限定されず、フィン７をスライド自在に保持するものであればよい。例えば、機械式に保持する方式や、磁力によって保持する方式などを採用できる。 Here, the configuration of the punch 8 of the press will be described. The holding means 81 of the punch 8 preferably sucks the fin 7 by sucking air inside the suction cup provided on the surface of the punch 8, but is not limited to this, and holds the fin 7 slidably. If it is. For example, a mechanical holding method or a magnetic holding method can be employed.
　パンチ先端８２は、図６に示すように、突出爪８２ａと切欠８２ｂとを交互に有しており、凸条５を断続的（不連続的）に押圧できるようになっている。また、パンチ８の部材厚さは、強度を高めるために、隣接するフィン７の間隔と比べて広くすることができる。 As shown in FIG. 6, the punch tip 82 has protruding claws 82 a and notches 82 b alternately so that the ridges 5 can be pressed intermittently (discontinuously). The member thickness of the punch 8 can be made wider than the interval between the adjacent fins 7 in order to increase the strength.
　挿入する工程では、図５Ｂに示すように、各フィン７を保持しているパンチ８をベース２に向かって移動させて、各フィン７の基端部７１を各凹溝３内に挿入する。フィン７の先端が、凹溝３の底部に接触した時点以降は、次に説明するかしめ固定する工程となる。 In the inserting step, as shown in FIG. 5B, the punch 8 holding each fin 7 is moved toward the base 2, and the base end portion 71 of each fin 7 is inserted into each groove 3. After the time when the tips of the fins 7 are in contact with the bottom of the concave groove 3, a caulking and fixing process described below is performed.
　かしめ固定する工程では、図５Ｃに示すように、パンチ８のみをベース２に向かってスライド移動させ、パンチ先端８２で各フィン７の一方側の凸条５のフィン７側部分のみを押しつぶすことによって、フィン７側に突出する突出部５１を形成し、フィン７の基端部７１をかしめ固定する。すなわち、凹溝３に挿入されたフィン７は移動せずに、パンチ８のみがスライド移動する。 In the caulking and fixing step, as shown in FIG. 5C, only the punch 8 is slid toward the base 2 and only the fin 7 side portion of the ridge 5 on one side of each fin 7 is crushed by the punch tip 82. A protrusion 51 protruding toward the fin 7 is formed, and the base end 71 of the fin 7 is caulked and fixed. That is, the fins 7 inserted into the concave grooves 3 do not move, and only the punch 8 slides.
　そして、あらかじめ設定した押圧荷重になった時点で、コントローラ（図示しない）はかしめ固定が完了したと判断し、パンチ８のスライド移動（下降）を終了する。 Then, when the preset pressing load is reached, the controller (not shown) determines that the caulking is completed, and the slide movement (lowering) of the punch 8 is finished.
　その後、パンチ８は、ベース２から離れるように移動して、次のフィン７を保持する工程、挿入する工程、及び、かしめ固定する工程のために移動する。この隣接するフィン７を挿入する工程、かしめ固定する工程のための移動では、パンチ８を、押しつぶされた一方側の凸条５の側に位置する別の凹溝３に順に移動させる。 After that, the punch 8 moves away from the base 2 and moves for the process of holding the next fin 7, the process of inserting, and the process of fixing by caulking. In the movement for the step of inserting the adjacent fins 7 and the step of caulking and fixing, the punch 8 is moved in order to another groove 3 positioned on the side of the ridge 5 on one side that has been crushed.
　また、かしめ固定する工程では、上述したようにパンチ先端８２の不連続な突出爪８２ａによって、一方側の凸条５をこの凸条５の延長方向に沿って間隔をあけて断続的に押しつぶし、フィン７の基端部７１を断続的にかしめ固定する。 Further, in the caulking and fixing step, as described above, the protruding ridges 5 on one side are intermittently crushed at intervals along the extending direction of the protruding ridges 5 by the discontinuous protruding claws 82a of the punch tip 82, The base end portion 71 of the fin 7 is intermittently caulked and fixed.
　さらに、凹溝３及び凸条４（５）の延びる方向に沿ったパンチ８の長さは、フィン７の長さよりも短くなっているため、かしめ固定する工程は、凸条４（５）の延長方向に複数回に分けて実施される。
（従来の製造方法） Furthermore, since the length of the punch 8 along the extending direction of the groove 3 and the ridge 4 (5) is shorter than the length of the fin 7, the step of caulking and fixing is performed on the ridge 4 (5). It is carried out in several times in the extending direction.
(Conventional manufacturing method)
　これに対して、図７Ａ～７Ｃ、８に示す従来の製造方法は、以下のようにフィンｂをかしめ固定していた。すなわち、はじめに、図７Ａに示すように、フィン押えブロックｃによって、ベースａに配置されたフィンｂの上面を押さえる。次に、図７Ｂに示すように、ベースａに形成したＶ字状の溝に向かってパンチ先端を近づける。最後に、図７Ｃに示すように、パンチ先端をＶ字状の溝に押し込んで、フィンｂの基端部をかしめ固定する。 On the other hand, in the conventional manufacturing method shown in FIGS. 7A to 7C and 8, the fin b is caulked and fixed as follows. That is, first, as shown in FIG. 7A, the upper surface of the fin b arranged on the base a is pressed by the fin pressing block c. Next, as shown in FIG. 7B, the tip of the punch is brought closer to the V-shaped groove formed in the base a. Finally, as shown in FIG. 7C, the tip end of the punch is pushed into the V-shaped groove, and the base end portion of the fin b is caulked and fixed.
　しかしながら、以下のような問題が生じるおそれがあった。まず、図７Ａ～７Ｃに示すように、周囲のフィンｂよりも長さの短いフィンｂ１がある場合には、フィン押えブロックｃによってフィンｂ１の上面を押さえることができない。その結果、短いフィンｂ１に浮きが生じたり、傾いたりした状態でかしめ固定されることになって、十分な強度で固定できなくなるおそれがあった。 However, the following problems may occur. First, as shown in FIGS. 7A to 7C, when there is a fin b1 having a shorter length than the surrounding fin b, the upper surface of the fin b1 cannot be pressed by the fin pressing block c. As a result, the short fin b1 is fixed by caulking in a state where it floats or tilts, and there is a possibility that it cannot be fixed with sufficient strength.
　また、図８に示すように、ベースａの厚さが位置によって異なっている場合、例えば、中央で厚く周辺で薄い場合には、フィン押えブロックｃによって周辺のフィンｂ２、ｂ３の上面を押さえることができない。その結果、周辺のフィンｂ２、ｂ３に浮きが生じたり、傾いたりした状態でかしめ固定されることになって、十分な強度で固定できなくなるおそれがあった。 Further, as shown in FIG. 8, when the thickness of the base a varies depending on the position, for example, when the thickness is thick at the center and thin at the periphery, the upper surfaces of the peripheral fins b2 and b3 are pressed by the fin press block c. I can't. As a result, the peripheral fins b2 and b3 are fixed by caulking in a state where the fins b2 and b3 are floated or tilted, and there is a possibility that they cannot be fixed with sufficient strength.
（効果）
　次に、本実施例のヒートシンク１の奏する効果を列挙して説明する。 (effect)
Next, the effects exhibited by the heat sink 1 of this embodiment will be listed and described.
（１）本実施例のヒートシンク１は、複数の凹溝３及び複数の凸条４、５が交互に設けられたベース２と、凹溝３の溝幅よりも薄い板状に形成された複数のフィン７と、を備えるヒートシンク１である。そして、各凹溝３内に各フィン７の基端部７１が挿入されるとともに、各フィン７の一方側の凸条５のみに各フィン７側に突出する突出部５１が形成されて、各フィン７の基端部７１が、各フィン７の一方側の凸条５の突出部５１と各フィン７の他方側の凸条４の側面４１との間でかしめ固定されている。 (1) The heat sink 1 of the present embodiment includes a base 2 in which a plurality of concave grooves 3 and a plurality of convex strips 4 and 5 are alternately provided, and a plurality of plates formed thinner than the groove width of the concave grooves 3. The heat sink 1 is provided with a fin 7. And while the base end part 71 of each fin 7 is inserted in each concave groove 3, the protrusion part 51 which protrudes in each fin 7 side is formed only in the protruding item | line 5 of one side of each fin 7, The base end portion 71 of the fin 7 is caulked and fixed between the protruding portion 51 of the ridge 5 on one side of each fin 7 and the side surface 41 of the ridge 4 on the other side of each fin 7.
　この構成によれば、ヒートシンク１を製造する際に、パンチ８を一方側の凸条５の側に位置する別の凹溝３に順に移動させて、次のフィン７を挿入・かしめ固定できる。したがって、フィン７どうしの間にパンチ８を挿入する必要がないため、フィン７の配置間隔を狭くできる。 According to this configuration, when manufacturing the heat sink 1, the next fin 7 can be inserted and caulked and fixed by sequentially moving the punch 8 to the other groove 3 positioned on the one side of the ridge 5 side. Therefore, since it is not necessary to insert the punch 8 between the fins 7, the arrangement interval of the fins 7 can be narrowed.
　また、フィン７どうしの間にパンチ８を挿入しないことにより、フィン７の高さを高くしても、パンチ８を高くする必要がなくなるため、フィン７の高さを高くできる。 Further, by not inserting the punches 8 between the fins 7, even if the height of the fins 7 is increased, there is no need to increase the punches 8, so that the height of the fins 7 can be increased.
　さらに、他方側の凸条４の側面４１が、各フィン７の基端部７１に全面的に接触することで、ベース２からフィン７への熱伝達を面－面間で効率よく行うことができる。 Furthermore, since the side surface 41 of the other ridge 4 is in full contact with the base end portion 71 of each fin 7, heat transfer from the base 2 to the fin 7 can be efficiently performed between the surfaces. it can.
　このように、フィン７の配置間隔を狭くできること、フィン７の高さを高くできること、及び、ベース２からフィン７への熱伝達を効率よく行うこと、によって、冷却性能に優れたヒートシンク１となる。 Thus, the heat sink 1 having excellent cooling performance can be obtained by reducing the arrangement interval of the fins 7, increasing the height of the fins 7, and efficiently performing heat transfer from the base 2 to the fins 7. .
　さらに、フィン７を１枚ずつかしめ固定することによって、１プレス当たりのかしめ荷重を小さくできる。したがって、製造装置を小型化できるうえ、初期投資の額を軽減できる。 Furthermore, the caulking load per press can be reduced by caulking and fixing the fins 7 one by one. Therefore, the manufacturing apparatus can be downsized and the initial investment can be reduced.
（２）一方側の凸条５の突出部５１は、該凸条５の延長方向に沿って間隔をあけて断続的に形成されて、フィン７の基端部７１が凹溝３の延長方向に沿って断続的にかしめ固定されていることによって、いっそう１プレス当たりのかしめ荷重を小さくできる。 (2) The protruding portion 51 of the protruding ridge 5 on one side is formed intermittently at intervals along the extending direction of the protruding ridge 5, and the base end portion 71 of the fin 7 extends in the extending direction of the recessed groove 3. , The caulking load per press can be further reduced.
　具体的にいうと、幅１２０ｍｍ長さ１００ｍｍのベースを従来の製造方法で３回かしめる場合には必要な荷重は１８０ｔであった。これに対して、本発明では、必要な荷重は０．８ｔとなる。したがって、装置を小型化できるうえ、初期投資の額を軽減できる。 Specifically, when a base having a width of 120 mm and a length of 100 mm is caulked three times by a conventional manufacturing method, the necessary load was 180 t. On the other hand, in the present invention, the necessary load is 0.8 t. Therefore, the apparatus can be miniaturized and the initial investment can be reduced.
（３）そして、本実施例のヒートシンク１の製造方法は、複数の凹溝３及び複数の凸条４、５が交互に設けられたベース２と、凹溝３の溝幅よりも薄い板状に形成された複数のフィン７と、を準備する工程と、フィン７をスライド可能に保持する保持手段８１を有するパンチ８によって、各フィン７をパンチ先端８２から突出した状態で保持する工程と、各フィン７を保持しているパンチ８をベース２に向かって移動させ、各フィン７の基端部７１を各凹溝３内に挿入する工程と、パンチ８のみをベース２に向かってスライド移動させ、パンチ先端８２で各フィン７の一方側の凸条５のみを押しつぶすことによって、フィン７側に突出する突出部５１を形成し、フィン７の基端部７１をかしめ固定する工程と、を含み、保持する工程、挿入する工程、及びかしめ固定する工程を各フィンに対して繰り返し実施して、複数のフィン７をベース２に固定する。 (3) And the manufacturing method of the heat sink 1 of a present Example is plate-shaped thinner than the groove | channel width of the base 2 with which the several ditch | groove 3 and the some protruding item | line 4, 5 were provided alternately, and the ditch | groove 3 A step of preparing a plurality of fins 7 formed in the step, and a step of holding each fin 7 in a state of protruding from the punch tip 82 by a punch 8 having a holding means 81 for holding the fin 7 slidably, The step of moving the punches 8 holding the fins 7 toward the base 2 and inserting the base end portions 71 of the fins 7 into the concave grooves 3, and the sliding movement of only the punches 8 toward the base 2 And forming a protrusion 51 protruding toward the fin 7 by crushing only the protrusion 5 on one side of each fin 7 with the punch tip 82, and caulking and fixing the base end 71 of the fin 7. Including, holding, inserting Step, and a step of caulking repeatedly performed for each fin, to fix the plurality of fins 7 in the base 2.
　そして、パンチ８を、押しつぶされた一方側の凸条５の側に位置する別の凹溝３に順に移動させて、次のフィン７を挿入する工程及びかしめ固定する工程を実施する。 Then, the punch 8 is sequentially moved to another groove 3 positioned on the one side of the crushed ridge 5, and the step of inserting the next fin 7 and the step of fixing by caulking are performed.
　このため、フィン７どうしの間にパンチ８を挿入する必要がなく、反対側の空間を利用できるため、フィン７の間隔を狭くできる。また、フィン７どうしの間にパンチ８を挿入しないことにより、フィン７の高さを高くしても、パンチ８を高くする必要がなくなるため、フィン７の高さを高くできる。 For this reason, it is not necessary to insert the punch 8 between the fins 7, and the space on the opposite side can be used, so that the interval between the fins 7 can be reduced. Further, by not inserting the punches 8 between the fins 7, even if the height of the fins 7 is increased, there is no need to increase the punches 8, so that the height of the fins 7 can be increased.
　さらに、フィン７を１枚ずつ固定していくため、同一製品内においてフィンの配置間隔やフィンの厚みを容易に変更できる。すなわち、フィンの配置間隔やフィンの厚みが変わっても、段取換えなく同一のパンチ８を使用することができる。 Furthermore, since the fins 7 are fixed one by one, the fin arrangement interval and fin thickness can be easily changed in the same product. That is, even if the fin arrangement interval or the fin thickness changes, the same punch 8 can be used without changing the setup.
　加えて、従来の製造方法のように、フィン押えブロックｃを使用しないため、フィンｂの高さやベースａの厚みのばらつきの影響を受けることなく、ベース２にフィン７を十分な強度で固定できる。 In addition, unlike the conventional manufacturing method, since the fin holding block c is not used, the fin 7 can be fixed to the base 2 with sufficient strength without being affected by variations in the height of the fin b and the thickness of the base a. .
（４）かしめ固定する工程は、一方側の凸条５を該凸条５の延長方向に沿って間隔をあけて断続的に押しつぶすことによって、フィン７の基端部７１を断続的にかしめ固定することができる。したがって、１プレス当たりのかしめ荷重を小さくできる。 (4) In the caulking and fixing step, the base end portion 71 of the fin 7 is intermittently caulked and fixed by intermittently crushing the protruding ridges 5 on one side at intervals along the extending direction of the ridges 5. can do. Therefore, the caulking load per press can be reduced.
（５）パンチ８の横方向の長さは、フィン７の横方向の長さよりも短くなっており、かしめ固定する工程は、凸条５の延長方向に複数回に分けて実施されることによって、いっそう１プレス当たりのかしめ荷重を小さくできる。 (5) The lateral length of the punch 8 is shorter than the lateral length of the fin 7, and the step of caulking and fixing is performed in a plurality of times in the extending direction of the ridge 5. The caulking load per press can be further reduced.
　以下、図９、１０を用いて、ベース２の凹溝３の内側面の傾斜角度θの最適範囲を求めた実験について説明する。なお、実施例１で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。 Hereinafter, an experiment for obtaining the optimum range of the inclination angle θ of the inner surface of the groove 3 of the base 2 will be described with reference to FIGS. In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in Example 1, and demonstrates.
　はじめに、図９を用いてフィン７の傾斜角度θを定義する。傾斜角度θは、入口側が狭い逆テーパのときにθは負（マイナス）の値と定義し、入口側が広い正テーパのときにθは正（プラス）の値と定義する。換言すると、凹溝３の内側面が凹溝３の底部に向かって倒れている状態のときにθ＜０とする。 First, the inclination angle θ of the fin 7 is defined using FIG. The inclination angle θ is defined as a negative (minus) value when the entrance side is a narrow reverse taper, and θ is defined as a positive (plus) value when the entrance side is a wide positive taper. In other words, θ <0 when the inner surface of the groove 3 is tilted toward the bottom of the groove 3.
　実験では、幅１２０ｍｍで長さ１００ｍｍのベースに深さ２．５ｍｍの凹溝３を形成した。この凹溝３に高さ１００ｍｍのフィン７を挿入し、かしめ固定して、フィン高さ１００ｍｍ先端における位置ずれ量（ｍｍ）を計測して傾きとした。例えば、傾斜角度θ＝－１°は、傾き０．０４ｍｍに相当する。 In the experiment, a concave groove 3 having a depth of 2.5 mm was formed on a base having a width of 120 mm and a length of 100 mm. A fin 7 having a height of 100 mm was inserted into the concave groove 3 and fixed by caulking, and a positional deviation amount (mm) at the tip of the fin height 100 mm was measured to obtain an inclination. For example, the inclination angle θ = −1 ° corresponds to an inclination of 0.04 mm.
　表１、図１０に実験結果を示している。表１、図１０には、溝角度が－２°から２°の範囲で計測したフィン高さ１００ｍｍにおける傾きを示す。 Table 1 and FIG. 10 show the experimental results. Table 1 and FIG. 10 show the inclination at a fin height of 100 mm measured in a groove angle range of −2 ° to 2 °.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　以下、本実施例の効果について説明する。実験結果についても考察する。 Hereinafter, the effect of this embodiment will be described. The experimental results are also considered.
（１）本実施例のヒートシンク１は、凹溝３の断面が、コ字状に形成されており、入口側が狭く、かつ、底側が広い、逆テーパ形状にされていることによって、フィン７を略垂直に固定できるようになる。 (1) In the heat sink 1 of this embodiment, the cross-section of the concave groove 3 is formed in a U-shape, and the fin 7 is formed by the reverse taper shape in which the inlet side is narrow and the bottom side is wide. It becomes possible to fix almost vertically.
　すなわち、ベース２は押出成形されるため、凹溝３の断面寸法には誤差が避けられない。このため、凹溝３を垂直（傾斜角度θ＝０°）に設計すると、テーパ形状（入口側が広い形状）の凹溝３が形成されるおそれがある。このようなテーパ形状の凹溝３にフィン７をかしめ固定すると、傾斜に即応してフィン７が傾斜することになる。 That is, since the base 2 is extruded, an error is inevitable in the cross-sectional dimension of the groove 3. For this reason, when the concave groove 3 is designed to be vertical (inclination angle θ = 0 °), the concave groove 3 having a tapered shape (a shape having a wide entrance side) may be formed. When the fins 7 are caulked and fixed in such a tapered groove 3, the fins 7 are inclined in response to the inclination.
　そこで、あらかじめ凹溝３の内側面を倒して逆テーパ形状に設計しておくことで、テーパ形状となることを防止している。ただし、テーパ形状にすると凹溝３の内側面が内側に倒れ過ぎてしまうおそれがある。しかし、その場合でも、かしめ固定する工程において、傾いて挿入されたフィン７をパンチ８の上部側面によって押し戻すことになる。したがって、フィン７の傾斜を抑えることができる。 Therefore, the inner surface of the groove 3 is tilted in advance and designed in a reverse taper shape to prevent the taper shape. However, if it is tapered, the inner surface of the groove 3 may fall inward too much. However, even in such a case, the fin 7 inserted at an angle is pushed back by the upper side surface of the punch 8 in the caulking and fixing step. Therefore, the inclination of the fin 7 can be suppressed.
（２）逆テーパ形状にされた凹溝３の内側面の傾斜角度θは、－２°から０°の範囲にされていることによって、フィン７の傾斜を最小限に抑えることができる。 (2) The inclination angle θ of the inner surface of the concave groove 3 having the reverse taper shape is set in the range of −2 ° to 0 °, so that the inclination of the fin 7 can be minimized.
　すなわち、表１、図１０に示すように、傾斜角度θが－２°から０°の範囲では、傾きは平均値で０．１～０．３ｍｍになり、最大値でも０．２～０．５ｍｍとなる。これに対して、傾斜角度θが０．５°から２°の範囲では、傾きは平均値で１．８～５．０ｍｍとなり、最大値で２．１～５．２ｍｍとなる。 That is, as shown in Table 1 and FIG. 10, when the inclination angle θ is in the range of −2 ° to 0 °, the average value is 0.1 to 0.3 mm, and the maximum value is 0.2 to 0.00. 5 mm. On the other hand, when the tilt angle θ is in the range of 0.5 ° to 2 °, the average value is 1.8 to 5.0 mm, and the maximum value is 2.1 to 5.2 mm.
　このように、傾斜角度θが－２°から０°の範囲にあることによって、フィン７先端での位置ずれ量を小さくできる。 Thus, when the inclination angle θ is in the range of −2 ° to 0 °, the amount of positional deviation at the tip of the fin 7 can be reduced.
　なお、この他の構成および作用効果については、前記実施の形態と略同様であるため説明を省略する。 Note that other configurations and operational effects are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.
　以下、図１１Ａ～１８を用いて、実施例１、２とは別の形態のヒートシンク１Ａ～１Ｈについて説明する。なお、実施例１、２で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。 Hereinafter, heat sinks 1A to 1H having different forms from the first and second embodiments will be described with reference to FIGS. In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in Example 1,2.
（構成）
　前提として、本実施例のヒートシンク１Ａ～１Ｈは、実施例１で説明したヒートシンク１の構成を基本構成として備えている。すなわち、本実施例のヒートシンク１Ａ～１Ｈは、複数の凹溝３及び複数の凸条４、５が交互に設けられたベース２と、凹溝３の溝幅よりも薄い板状に形成された複数のフィン７と、を備えている。そして、各凹溝３内に各フィン７（７Ａ、７Ｂ、７Ｃ、７Ｄ、７Ｅ）の基端部７１が挿入されるとともに、各フィン７の一方側の凸条５のみに各フィン７側に突出する突出部５１が形成されて、各フィン７の基端部７１が、各フィン７の一方側の凸条５の突出部５１と各フィン７の他方側の凸条４の側面４１との間でかしめ固定されている。 (Constitution)
As a premise, the heat sinks 1A to 1H of the present embodiment have the basic configuration of the heat sink 1 described in the first embodiment. That is, the heat sinks 1A to 1H of the present embodiment were formed in a plate shape thinner than the groove width of the groove 2 and the base 2 in which the plurality of grooves 3 and the plurality of ridges 4, 5 were alternately provided. And a plurality of fins 7. And while the base end part 71 of each fin 7 (7A, 7B, 7C, 7D, 7E) is inserted in each concave groove 3, only the convex strip 5 of one side of each fin 7 is on each fin 7 side. Protruding protrusions 51 are formed, and the base ends 71 of the fins 7 are formed between the protrusions 51 of the protrusions 5 on one side of the fins 7 and the side surfaces 41 of the protrusions 4 on the other side of the fins 7. It is fixed in between.
　そして、本実施例のヒートシンク１Ａ～１Ｈは、基本構成とは別に以下のような特徴を備えている。 The heat sinks 1A to 1H of the present embodiment have the following characteristics in addition to the basic configuration.
　図１１Ａ、１１Ｂに示すヒートシンク１Ａは、フィン７の上端に段差を設けた別の実施形態である。図１１Ａは、熱源９１、９２に対応して温度の均一化を図った例である。この実施形態では、複数のフィン７は、高いフィン７Ａと低いフィン７Ｂとから構成される。そして、高いフィン７Ａの一群と低いフィン７Ｂの一群とを、熱源９１、９２の発熱量に対応して分けて配置している。すなわち、発熱量が多い熱源９１の裏側には高いフィン７Ａを配置し、発熱量が少ない熱源９２の裏側には低いフィン７Ｂを配置する。 11A and 11B is another embodiment in which a step is provided at the upper end of the fin 7. FIG. 11A is an example in which the temperature is made uniform corresponding to the heat sources 91 and 92. In this embodiment, the plurality of fins 7 are composed of high fins 7A and low fins 7B. Then, the group of high fins 7A and the group of low fins 7B are separately arranged corresponding to the heat generation amounts of the heat sources 91 and 92. That is, the high fins 7A are arranged on the back side of the heat source 91 that generates a large amount of heat, and the low fins 7B are arranged on the back side of the heat source 92 that generates a small amount of heat.
　図１１Ｂは、他部品９３との干渉を回避した例である。この実施形態では、複数のフィン７は、高いフィン７Ａと低いフィン７Ｂとから構成される。そして、高いフィン７Ａの一群と低いフィン７Ｂの一群とを、ベース２上方の他部品９３との干渉を回避するように分けて配置している。すなわち、他部品９３が存在する側に低いフィン７Ｂを配置し、他部品９３が存在しない側に高いフィン７Ａを配置する。 FIG. 11B is an example in which interference with other parts 93 is avoided. In this embodiment, the plurality of fins 7 are composed of high fins 7A and low fins 7B. A group of high fins 7A and a group of low fins 7B are separately arranged so as to avoid interference with other components 93 above the base 2. That is, the low fins 7B are arranged on the side where the other parts 93 are present, and the high fins 7A are arranged on the side where the other parts 93 are not present.
　図１２に示すヒートシンク１Ｂは、フィン７の上端に千鳥状の凹凸を設けた別の実施形態である。この実施形態では、複数のフィン７は、高いフィン７Ａと低いフィン７Ｂとから構成される。そして、高いフィン７Ａと低いフィン７Ｂとを交互に配置することによって、複数のフィン７の上端の包絡面に千鳥状の凹凸が形成されている。この千鳥状の凹凸が形成された包絡面の上方には、ファン９４が設置される。 12 is another embodiment in which staggered irregularities are provided on the upper ends of the fins 7. In this embodiment, the plurality of fins 7 are composed of high fins 7A and low fins 7B. And the staggered unevenness | corrugation is formed in the envelope surface of the upper end of the several fin 7 by arrange | positioning the high fin 7A and the low fin 7B alternately. A fan 94 is installed above the envelope surface on which the staggered irregularities are formed.
　図１３に示すヒートシンク１Ｈは、フィン７の高さが徐々に変化することによって、フィン７の上端の包絡面に階段状の傾斜を設けた別の実施形態である。この実施形態では、複数のフィン７は、高いフィン７から低いフィン７まで高さの異なるフィン７によって構成される。そして、高いフィン７から低いフィン７へと順にベース２に配置することによって、複数のフィン７の上端の包絡面に階段状の傾斜が設けられる。 The heat sink 1H shown in FIG. 13 is another embodiment in which a step-like slope is provided on the envelope surface of the upper end of the fin 7 as the height of the fin 7 gradually changes. In this embodiment, the plurality of fins 7 are constituted by fins 7 having different heights from a high fin 7 to a low fin 7. Then, by arranging the fins 7 on the base 2 in order from the high fins 7 to the low fins 7, a step-like slope is provided on the envelope surfaces at the upper ends of the plurality of fins 7.
　図１４に示すヒートシンク１Ｃは、ベース２を部分的に厚く形成した別の実施形態である。すなわち、熱源９１をベース２にビス６１、６１で固定する際に、ビス穴の長さを確保するために、フィン７が配置される側のベース２表面に厚い部分６を設けている。そして、厚い部分６のフィン７を短くすることで、フィン７の上面を面一に揃えている。 A heat sink 1C shown in FIG. 14 is another embodiment in which the base 2 is partially thick. That is, when the heat source 91 is fixed to the base 2 with the screws 61, 61, the thick portion 6 is provided on the surface of the base 2 on the side where the fins 7 are arranged in order to secure the length of the screw hole. And the fin 7 of the thick part 6 is shortened, and the upper surface of the fin 7 is arrange | equalized.
　図１５に示すヒートシンク１Ｄは、厚いフィン７Ｃと薄いフィン７Ｄとを組み合わせた別の実施形態である。すなわち、厚いフィン７Ｃを最も外側に配置し、内側に薄いフィン７Ｄを配置する。 15 is another embodiment in which thick fins 7C and thin fins 7D are combined. That is, the thick fin 7C is disposed on the outermost side, and the thin fin 7D is disposed on the inner side.
　図１６に示すヒートシンク１Ｅは、フィン７の間隔がベース２内の位置によって異なる別の実施形態である。すなわち、熱源９１に近い部分ではフィン７の配置間隔を密にし、熱源９１から遠い部分ではフィン７の配置間隔を疎にする。 16 is another embodiment in which the interval between the fins 7 is different depending on the position in the base 2. That is, the arrangement interval of the fins 7 is made close at a portion close to the heat source 91, and the arrangement interval of the fins 7 is made sparse at a portion far from the heat source 91.
　さらに、フィンの厚みを変えつつ配置間隔を変えることもできる。例えば、最も外側のフィンの厚みを厚くしつつ、フィンの配置間隔を熱源の近くで密にすることもできる。 Furthermore, the arrangement interval can be changed while changing the thickness of the fin. For example, the thickness of the outermost fins can be increased, and the fins can be arranged closer to the heat source.
　図１７に示すヒートシンク１Ｆは、フィン７が２つのビード部７２、７２を有する別の実施形態である。ビード部７２は、帯状の薄い突出部であり、型押加工などによって形成される。ビード部７２は、フィン７の基端部７１側から先端側に向かって半分以上の高さまで伸びている。なお、ビード部の数や配設方向は本実施形態に限定されない。例えば、ビード部は、１本でも５本でもよいし、横方向に配設してもよいし、斜め方向に配設してもよい。 17 is another embodiment in which the fin 7 has two bead portions 72, 72. The heat sink 1F shown in FIG. The bead portion 72 is a belt-like thin protrusion and is formed by embossing or the like. The bead portion 72 extends to a height of more than half from the proximal end 71 side of the fin 7 toward the distal end side. The number of beads and the arrangement direction are not limited to this embodiment. For example, the number of bead portions may be one or five, may be arranged in the horizontal direction, or may be arranged in an oblique direction.
　図１８に示すヒートシンク１Ｇは、フィン７Ｆが少なくとも１つのエンボス部７３を有する別の実施形態である。エンボス部７３は、円形の薄い突出部であり、型押加工などによって形成される。エンボス部７３は、フィン７の全面に略均等に千鳥状に配置されている。なお、エンボス部７３の形状、数、配置は本実施形態に限定されない。 18 is another embodiment in which the fins 7F have at least one embossed portion 73. The heat sink 1G shown in FIG. The embossed portion 73 is a circular thin protrusion, and is formed by embossing or the like. The embossed portions 73 are arranged on the entire surface of the fin 7 in a substantially staggered manner. The shape, number, and arrangement of the embossed portion 73 are not limited to the present embodiment.
（効果）
　次に、本実施例のヒートシンク１Ａ～１Ｈの奏する効果をそれぞれ説明する。 (effect)
Next, the effects exerted by the heat sinks 1A to 1H of this embodiment will be described.
（１）ヒートシンク１Ａの複数のフィンは、高いフィン７Ａと低いフィン７Ｂとから構成され、複数のフィン７の上端の包絡面に段差が形成されている。このため、熱源９１、９２に合わせてフィン７の高さを変えることによって、温度を均一化できる。さらに、ベース２の上方に他部品９３が存在しても、容易に回避することができる。 (1) The plurality of fins of the heat sink 1 </ b> A are composed of high fins 7 </ b> A and low fins 7 </ b> B, and steps are formed on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, the temperature can be made uniform by changing the height of the fins 7 according to the heat sources 91 and 92. Furthermore, even if another component 93 exists above the base 2, it can be easily avoided.
（２）ヒートシンク１Ｂの複数のフィンは、高いフィン７Ａと低いフィン７Ｂとから構成され、複数のフィン７の上端の包絡面に千鳥状の凹凸が形成されている。このため、フィン７Ａ、７Ｂの上方にファン９４が設置される場合に、目詰まりを軽減できる。 (2) The plurality of fins of the heat sink 1 </ b> B are composed of high fins 7 </ b> A and low fins 7 </ b> B, and staggered irregularities are formed on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, when the fan 94 is installed above the fins 7A and 7B, clogging can be reduced.
（３）ヒートシンク１Ｈの複数のフィン７は、高いフィン７から低いフィン７まで異なる高さのフィン７によって構成され、複数のフィン７の上端の包絡面に階段状の傾斜が設けられる。このため、フィン７の上方にファン（不図示）が配置される場合に、目詰まりを軽減できる。また、ベース２の上方に他部品（不図示）が存在しても、容易に回避することができる。 (3) The plurality of fins 7 of the heat sink 1H are configured by fins 7 having different heights from the high fins 7 to the low fins 7, and a step-like slope is provided on the envelope surfaces at the upper ends of the plurality of fins 7. For this reason, when a fan (not shown) is arrange | positioned above the fin 7, clogging can be reduced. Moreover, even if other parts (not shown) exist above the base 2, it can be easily avoided.
（４）ヒートシンク１Ｃのベース２は、熱源９１の固定用ビス６１を取り付けるために、複数のフィン７が配置される表面から面外に突き出た厚い部分６を有している。このように厚い部分６を有していても、フィン７の高さを部分的に低くすることによって、フィン７の上端の包絡面に段差を生じることなく、平面に形成できる。 (4) The base 2 of the heat sink 1C has a thick portion 6 protruding out of the surface from the surface on which the plurality of fins 7 are arranged in order to attach the fixing screw 61 of the heat source 91. Even if the thick portion 6 is provided in this way, it can be formed in a flat surface without causing a step on the envelope surface at the upper end of the fin 7 by partially reducing the height of the fin 7.
（５）ヒートシンク１Ｄの複数のフィン７は、厚いフィン７Ｃと薄いフィン７Ｄとから構成されている。このため、必要な強度を備えつつ、冷却効率の優れたヒートシンク１になる。 (5) The plurality of fins 7 of the heat sink 1D are composed of thick fins 7C and thin fins 7D. For this reason, it becomes the heat sink 1 with the required strength and excellent cooling efficiency.
（６）ヒートシンク１Ｅの複数のフィン７の配置間隔が、ベース２内の位置によって異なっている。このため、熱源９１の配置に応じてフィン７の配置間隔を変えることで、最適なフィン７配置を実現できる。 (6) The arrangement interval of the plurality of fins 7 of the heat sink 1E differs depending on the position in the base 2. For this reason, the optimal fin 7 arrangement | positioning is realizable by changing the arrangement | positioning space | interval of the fin 7 according to arrangement | positioning of the heat source 91. FIG.
（７）ヒートシンク１Ｆのフィン７Ｅは、少なくとも１つのビード部７２を有している。このため、フィン７Ｅの剛性を高めることができる。これによって、フィン７Ｅを薄く形成しても、フィン７Ｅが共振することを防止できる。 (7) The fin 7E of the heat sink 1F has at least one bead portion 72. For this reason, the rigidity of the fin 7E can be improved. Thereby, even if the fin 7E is formed thin, it is possible to prevent the fin 7E from resonating.
（８）ヒートシンク１Ｇのフィン７Ｆは、少なくとも１つのエンボス部７３を有している。このため、フィン７Ｆの剛性を高めることができる。これによって、フィン７Ｆを薄く形成しても、フィン７Ｆが共振することを防止できる。 (8) The fin 7F of the heat sink 1G has at least one embossed portion 73. For this reason, the rigidity of the fin 7F can be improved. Thereby, even if the fin 7F is formed thin, it is possible to prevent the fin 7F from resonating.
　以上（１）～（８）に説明したように、本実施例のヒートシンク１Ａ～１Ｈは、様々な特徴をそなえている。このようなヒートシンク１Ａ～１Ｈは、実施例１に示す基本構成を備えていることによって実現可能である。 As described above in (1) to (8), the heat sinks 1A to 1H of the present embodiment have various features. Such heat sinks 1A to 1H can be realized by having the basic configuration shown in the first embodiment.
　なお、この他の構成および作用効果については、前記実施の形態と略同様であるため説明を省略する。 Note that other configurations and operational effects are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.
　以下、図１９を用いて、本発明のヒートシンク１の熱特性の計算結果について説明する。なお、実施例１～３で説明した内容と同一乃至均等な部分の説明については同一符号を付して説明する。 Hereinafter, the calculation results of the thermal characteristics of the heat sink 1 of the present invention will be described with reference to FIG. Note that the same or equivalent parts as those described in the first to third embodiments will be described with the same reference numerals.
　計算では、実施例２と同様に、幅１２０ｍｍ、長さ１００ｍｍのベースに高さ１００ｍｍのフィン７を挿入してかしめ固定した状態を想定して熱特性を計算した。 In the calculation, the thermal characteristics were calculated in the same manner as in Example 2 assuming that the fin 7 having a height of 100 mm was inserted into the base having a width of 120 mm and a length of 100 mm and fixed by caulking.
　比較のために、本実施例のヒートシンク１に加えて、従来技術（特許文献１、２参照）のヒートシンク１１に相当する条件でも風速－熱抵抗の関係を計算した。本実施例のヒートシンク１、従来技術のヒートシンク１１の（フィン間隔（ｍｍ）、フィン肉厚（ｍｍ）、フィン枚数）は、それぞれ、（１．９、１．２、３８）、（３．２、０．８、２９）である。なお、フィン間隔（ｍｍ）は、フィン７の面間の距離をいう。 For comparison, in addition to the heat sink 1 of the present embodiment, the relationship between the wind speed and the thermal resistance was also calculated under conditions corresponding to the heat sink 11 of the prior art (see Patent Documents 1 and 2). The heat sink 1 of the present embodiment and the heat sink 11 of the prior art (fin interval (mm), fin thickness (mm), number of fins) are (1.9, 1.2, 38), (3.2), respectively. 0.8, 29). The fin interval (mm) refers to the distance between the surfaces of the fins 7.
　図１９は、風速０．５（ｍ／ｓ）から５．０（ｍ／ｓ）の熱抵抗の計算値（Ｋ／Ｗ）を示している。図１９から読み取れるように、本実施例のヒートシンク１は、従来技術のヒートシンク１１と比べて、優れた熱特性を備えている。具体的にいうと、風速３ｍ／ｓ時には、従来技術のヒートシンク１１よりも約３５％特性が向上している。 FIG. 19 shows a calculated value (K / W) of thermal resistance from a wind speed of 0.5 (m / s) to 5.0 (m / s). As can be seen from FIG. 19, the heat sink 1 of this embodiment has superior thermal characteristics as compared to the heat sink 11 of the prior art. Specifically, when the wind speed is 3 m / s, the characteristics are improved by about 35% compared to the heat sink 11 of the prior art.
　なお、この他の構成および作用効果については、前記実施の形態と略同様であるため説明を省略する。 Note that other configurations and operational effects are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.
　以上、図面を参照して、本発明の実施例を詳述してきたが、具体的な構成は、これらの実施例に限らず、本発明の要旨を逸脱しない程度の設計的変更は、本発明に含まれる。 Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and design changes that do not depart from the gist of the present invention are not limited thereto. include.
　例えば、実施例１～４では、凹溝３の内側面を逆テーパ形状に形成する場合について説明したが、これに限定されるものではなく、ほとんど誤差なく凹溝を形成できる場合には、内側面は垂直に設計することもできる。 For example, in the first to fourth embodiments, the case where the inner surface of the concave groove 3 is formed in a reverse taper shape has been described. However, the present invention is not limited to this, and when the concave groove can be formed with almost no error, The side can also be designed vertically.
　また、実施例１～４では、ベース２に対してフィン７を一方向にかしめ固定する場合について説明したが、すべてのフィン７を一方向にかしめ固定することに限定する意図はない。例えば、ベース２の中央から、一方側に向かって半分のフィン７をかしめ固定し、ベース２を反転させたうえで残りの半分のフィン７をかしめ固定することも可能である。 In the first to fourth embodiments, the case where the fins 7 are caulked and fixed in one direction to the base 2 has been described. However, there is no intention to limit all the fins 7 to be caulked and fixed in one direction. For example, half the fins 7 can be caulked and fixed toward the one side from the center of the base 2, and the base 2 can be reversed and the remaining half of the fins 7 can be caulked and fixed.
１、１Ａ～１Ｈ　ヒートシンク
２　ベース
３　凹溝
４　凸条（左）
４１　側面
５　凸条（右）
５１　突出部
６　厚い部分
７、７Ａ～７Ｅ　フィン
７１　基端部
７２　ビード部
８　パンチ
８１　保持手段
８２　パンチ先端
９１、９２　熱源
９３　他の部品
９４　ファン 1, 1A ~ 1H Heat sink 2 Base 3 Groove 4 Projection (left)
41 Side 5 Convex (right)
51 Protruding portion 6 Thick portion 7, 7A to 7E Fin 71 Base end portion 72 Bead portion 8 Punch 81 Holding means 82 Punch tip 91, 92 Heat source 93 Other components 94 Fan

Claims (15)

  1. 　複数の凹溝及び複数の凸条が交互に設けられたベースと、前記凹溝の溝幅よりも薄い板状に形成された複数のフィンと、を備えるヒートシンクであって、
    　各凹溝内に各フィンの基端部が挿入されるとともに、前記各フィンの一方側の凸条のみに前記各フィン側に突出する突出部が形成されて、
    　前記各フィンの基端部が、前記各フィンの一方側の凸条の前記突出部と前記各フィンの他方側の凸条の側面との間でかしめ固定されてなる、ヒートシンク。     A heat sink comprising a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves,
    The base end portion of each fin is inserted into each concave groove, and only a protruding line on one side of each fin is formed with a protruding portion that protrudes toward the fin side,
    A heat sink, wherein a base end portion of each fin is caulked and fixed between the protruding portion of one of the ridges of each fin and the side surface of the other ridge of each fin.
  2. 　前記一方側の凸条の前記突出部は、該凸条の延長方向に沿って間隔をあけて断続的に形成されて、前記フィンの基端部が前記凹溝の延長方向に沿って断続的にかしめ固定されている、請求項１に記載のヒートシンク。 The protrusions of the one side ridge are formed intermittently at intervals along the extending direction of the ridge, and the base end portion of the fin is intermittently formed along the extending direction of the concave groove. The heat sink according to claim 1, wherein the heat sink is fixed by crimping.
  3. 　前記凹溝の断面は、コ字状に形成されており、入口側が狭く、かつ、底側が広い、逆テーパ形状にされている、請求項１乃至請求項３のいずれか一項に記載のヒートシンク。 4. The heat sink according to claim 1, wherein a cross-section of the concave groove is formed in a U-shape, and has a reverse tapered shape in which an inlet side is narrow and a bottom side is wide. .
  4. 　前記逆テーパ形状にされた前記凹溝の内側面の傾斜角度は、－２度から０度の範囲にされている、請求項３に記載のヒートシンク。 The heat sink according to claim 3, wherein an inclination angle of an inner surface of the concave groove having the reverse tapered shape is in a range of -2 degrees to 0 degrees.
  5. 　前記複数のフィンは、高いフィンと低いフィンとから構成され、前記高いフィンの一群と前記低いフィンの一群とを分けて前記ベースに配置することによって、前記複数のフィンの上端の包絡面に段差が形成されている、請求項１乃至請求項４のいずれか一項に記載のヒートシンク。 The plurality of fins are composed of high fins and low fins, and a group of the high fins and a group of the low fins are separately arranged on the base, whereby a step is formed on an envelope surface at an upper end of the plurality of fins. The heat sink according to any one of claims 1 to 4, wherein the heat sink is formed.
  6. 　前記複数のフィンは、高いフィンと低いフィンとから構成され、前記高いフィンと前記低いフィンとを交互に前記ベースに配置することによって、前記複数のフィンの上端の包絡面に千鳥状の凹凸が形成されている、請求項１乃至請求項４のいずれか一項に記載のヒートシンク。 The plurality of fins are composed of high fins and low fins. By alternately arranging the high fins and the low fins on the base, staggered irregularities are formed on the envelope surfaces at the upper ends of the plurality of fins. The heat sink according to claim 1, wherein the heat sink is formed.
  7. 　前記複数のフィンは、高いフィンから低いフィンまで高さの異なるフィンによって構成され、前記高いフィンから前記低いフィンへと順に前記ベースに配置することによって、前記複数のフィンの上端の包絡面に階段状の傾斜を設ける、請求項１乃至請求項４のいずれか一項に記載のヒートシンク。 The plurality of fins are configured by fins having different heights from a high fin to a low fin, and are arranged on the base in order from the high fin to the low fin, whereby a staircase is provided on an envelope surface at an upper end of the plurality of fins. The heat sink as described in any one of Claims 1 thru | or 4 which provides a shape-like inclination.
  8. 　前記ベースは、前記複数のフィンが配置される表面から面外に突き出た部分を有している、請求項１乃至請求項７のいずれか一項に記載のヒートシンク。 The heat sink according to any one of claims 1 to 7, wherein the base has a portion protruding out of a plane from a surface on which the plurality of fins are arranged.
  9. 　前記複数のフィンは、厚いフィンと薄いフィンとから構成されている、請求項１乃至請求項８のいずれか一項に記載のヒートシンク。 The heat sink according to any one of claims 1 to 8, wherein the plurality of fins includes a thick fin and a thin fin.
  10. 　前記複数の前記フィンの配置間隔が、前記ベース内の位置によって異なっている、請求項１乃至請求項９のいずれか一項に記載のヒートシンク。 The heat sink according to any one of claims 1 to 9, wherein an interval between the fins is different depending on a position in the base.
  11. 　前記フィンは、少なくとも１つのビード部又はエンボス部を有していることを特徴とする請求項１乃至請求項１０のいずれか一項に記載のヒートシンク。 The heat sink according to any one of claims 1 to 10, wherein the fin has at least one bead portion or an embossed portion.
  12. 　ヒートシンクの製造方法であって、
    　複数の凹溝及び複数の凸条が交互に設けられたベースと、前記凹溝の溝幅よりも薄い板状に形成された複数のフィンと、を準備する工程と、
    　フィンをスライド可能に保持する保持手段を有するパンチによって、各フィンをパンチ先端から突出した状態で保持する工程と、
    　前記各フィンを保持している前記パンチを前記ベースに向かって移動させ、前記各フィンの基端部を前記各凹溝内に挿入する工程と、
    　前記パンチのみを前記ベースに向かってスライド移動させ、前記パンチ先端で前記各フィンの一方側の前記凸条のみを押しつぶすことによって、前記フィン側に突出する突出部を形成し、前記フィンの基端部をかしめ固定する工程と、を含み、
    　前記保持する工程、前記挿入する工程、及び前記かしめ固定する工程を各フィンに対して繰り返し実施して、前記複数のフィンを前記ベースに固定する、ヒートシンクの製造方法。     A method of manufacturing a heat sink,
    Preparing a base in which a plurality of concave grooves and a plurality of ridges are alternately provided, and a plurality of fins formed in a plate shape thinner than the groove width of the concave grooves;
    A step of holding each fin in a state protruding from the tip of the punch by a punch having holding means for holding the fin slidably;
    Moving the punch holding the fins toward the base, and inserting a base end portion of the fins into the concave grooves;
    By sliding only the punch toward the base and crushing only the convex stripes on one side of the fins at the tip of the punch, a protrusion projecting toward the fin is formed, and the base end of the fin Caulking and fixing the part,
    A method of manufacturing a heat sink, wherein the holding step, the inserting step, and the caulking and fixing step are repeatedly performed on each fin to fix the plurality of fins to the base.
  13. 　前記パンチを、押しつぶされた一方側の前記凸条の側に位置する別の凹溝に順に移動させて、次のフィンを挿入する工程及びかしめ固定する工程を実施する、請求項１２に記載のヒートシンクの製造方法。 The punch is moved in order to another groove located on the one side of the crushed ridge, and the step of inserting the next fin and the step of caulking and fixing are performed. Manufacturing method of heat sink.
  14. 　前記かしめ固定する工程は、前記一方側の凸条を該凸条の延長方向に沿って間隔をあけて断続的に押しつぶすことによって、前記フィンの基端部を断続的にかしめ固定する、請求項１２又は請求項１３に記載のヒートシンクの製造方法。 The step of caulking and fixing intermittently caulking and fixing the base end portion of the fin by intermittently crushing the protruding ridges on the one side at intervals along the extending direction of the ridges. A method for manufacturing a heat sink according to claim 12 or claim 13.
  15. 　前記パンチの長さは、前記フィンの長さよりも短くなっており、前記かしめ固定する工程は、前記凸条の延長方向に複数回に分けて実施される、請求項１２乃至請求項１４のいずれか一項に記載のヒートシンクの製造方法。
          The length of the punch is shorter than the length of the fin, and the step of caulking and fixing is performed a plurality of times in the extending direction of the ridges. A method for manufacturing a heat sink according to claim 1.
PCT/JP2013/069271 2013-07-16 2013-07-16 Heat sink and method for manufacturing heat sink WO2015008326A1 (en)

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