WO2002078417A1 - Heat sink and method for manufacturing the same - Google Patents

Heat sink and method for manufacturing the same Download PDF

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Publication number
WO2002078417A1
WO2002078417A1 PCT/KR2002/000526 KR0200526W WO02078417A1 WO 2002078417 A1 WO2002078417 A1 WO 2002078417A1 KR 0200526 W KR0200526 W KR 0200526W WO 02078417 A1 WO02078417 A1 WO 02078417A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat sink
fins
manufacturing
mold
manufactured
Prior art date
Application number
PCT/KR2002/000526
Other languages
French (fr)
Inventor
Jong-Mahn Lee
Goo-Bong Jung
Se-Jeong Park
Original Assignee
Jong-Mahn Lee
Goo-Bong Jung
Se-Jeong Park
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jong-Mahn Lee, Goo-Bong Jung, Se-Jeong Park filed Critical Jong-Mahn Lee
Publication of WO2002078417A1 publication Critical patent/WO2002078417A1/en

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Classifications

    • 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 potential barriers, e.g. a 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
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • 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
    • H01L23/367—Cooling facilitated by shape of device
    • H01L23/3672—Foil-like cooling fins or heat sinks
    • 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 same, and more particularly to a heat sink used for emitting heat generated from modules in various telecommunication relays and a method for manufacturing the same.
  • the telecommunication relay receives signals from a wave source and transmits the signal to a base station by amplifying the signals into high frequency waves.
  • a module for treating data having large capacity such as moving pictures, is accommodated in the mobile telecommunication. Heat is generated when the module treats the data having large capacity.
  • a heat sink is provided to emit the heat from the module.
  • various kinds of heat sinks are manufactured.
  • the weight of the heat sink is seriously considered when manufacturing the heat sink because the relay can be broken by the weight of the heat sink.
  • FIGS.. 1A and IB show a conventional heat sink 110 manufactured by using an extruder 100.
  • the heat sink 110 manufactured by the extruder 100 cannot effectively emit the heat when large quantity of heat is generated from the module in the relay. For this reason, there is required to provide a heat sink having fins, which are positioned higher than fins of the conventional heat sink 110 and are densely arranged.
  • the extruding method cannot obtain the heat sink having the above features.
  • FIGS. 2 A and 2B The structure of the heat sink manufactured by the pressing process is shown in FIGS. 2 A and 2B.
  • fins 120 are separately manufactured to improve the heat emitting effect.
  • an upper surface of the heat sink base 130 is manufactured as a concave and convex structure. The fins 120 are inserted into the concave and convex structure of the base 130. Then, a pressing work is carried out with respect to a periphery of the inserting portion to adhere the fins to the base.
  • the pressing method is not adapted for manufacturing the heat sink used in various telecommunication relays having the module for treating data of large capacity, such as moving pictures.
  • the present invention has been made to solve the above problems of the related art, therefore, it is an object of the present invention to provide a method for manufacturing a heat sink, which is used in a module of various telecommunication relays and capable of improving the heat emitting effect.
  • Another object of the present invention is to provide a method for manufacturing a heat sink, which can be easily manufactured and in which fins are densely arranged with each other.
  • a method for manufacturing a heat sink comprising the steps of manufacturing fins used for the heat sink; manufacturing a plurality of fin inserting portions in a lower mold; inserting the fins into the fin inserting portions of the lower mold; coupling an upper mold for manufacturing a base of the heat sink with the lower mold having the fins inserted therein; melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold after the cooling step is finished; and removing impurities from
  • a method for manufacturing a heat sink comprising the steps of: manufacturing fins used for the heat sink; manufacturing a plurality of partition plates for uniformly arranging the fins; arranging the partition plates on a lower mold, positioning the fins between the partition plates, and fixing the partition plates and the fins by using a hydraulic press fixing device; placing an upper mold for manufacturing a base of the heat sink on an upper surface of the lower mold; melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold and withdrawing the partition plates after the cooling step is finished; and removing impurities from a periphery of the heat sink.
  • the heat sink of the present invention is manufactured by the above methods.
  • FIG. 1A is a perspective view showing a heat sink manufactured by a conventional extruding method
  • FIG. IB is a front view of the heat sink shown in FIG. 1 A;
  • FIG. 2A is a perspective view showing a heat sink manufactured by a conventional pressing method
  • FIG. 2B is a front view of the heat sink shown in FIG. 2 A;
  • FIG. 3 is a flow chart showing a method for manufacturing a heat sink according to a first embodiment of the present invention
  • FIG 4A is a perspective view of a fin arranged in a heat sink according to a first embodiment of the present invention
  • FIG 4B is a perspective view of a mold for manufacturing a heat sink according to the first embodiment of the present invention
  • FIG 4C is a sectional view taken along the line C-C of FIG. 4B
  • FIG 5 A is a perspective view of a heat sink manufactured by a method according to the first embodiment of the present invention
  • FIG 5B is a sectional view taken along the line D-D' of FIG. 5A;
  • FIG. 6 is a flow chart showing a method for manufacturing a heat sink according to a second embodiment of the present invention.
  • FIG 7 is a perspective view of an injection mold for manufacturing a heat sink according to the second embodiment of the present invention.
  • FIG 8A is a perspective view of a heat sink manufactured by using the injection mold shown in FIG. 7;
  • FIG 8B is an enlarged view of a predetermined portion of the heat sink shown in FIG. 8A;
  • FIG 9 is a perspective view of a heat sink manufactured by a method according to the second embodiment of the present invention.
  • FIG. 10 is a flow chart showing a method for manufacturing a heat sink according to a third embodiment of the present invention.
  • FIG 11 is a perspective view of a heat sink manufactured by using the injection mold shown in FIG. 7 according to the third embodiment of the presented invention.
  • FIG 12 is a perspective view of a heat sink manufactured by a method according to the third embodiment of the present invention.
  • FIGS. 3 to 5B are views for explaining a method for manufacturing a heat sink according to a first embodiment of the present invention.
  • FIG.. 3 is a flow chart schematically showing a method for manufacturing the heat sink according to the first embodiment of the present invention.
  • the fins are manufactured through various processes, such as extruding, cutting, pressing, sintering, injecting or casting process (SI). Then, a plurality of inserting portions are manufactured in a lower mold into which the fins are inserted (S2). Then, after inserting the manufactured fins into the inserting portions of the lower mold (S3), an upper mold for manufacturing a base of the heat sink is coupled with the lower mold having the fins inserted therein (S4).
  • SI extruding, cutting, pressing, sintering, injecting or casting process
  • metal having a superior thermal conductivity such as aluminum alloys or magnesium is molten and injected into the upper mold (S5).
  • step (S5) air existing in the mold is discharged out of the mold by molten metal, so a gap is not manufactured between the base of the heat sink and the fins. Therefore, an insulation layer, such as an air layer, is not manufactured between the base of the heat sink and the fins, so the heat emitting effect is improved.
  • Molten metal injected into the mold is solidified as time lapses so that the heat sink base is manufactured. Then, the heat sink base is cooled such that the heat sink base is integrally manufactured with the fins (S6).
  • the heat sink, in which the fins and the base are integrally manufactured with each. other, is separated from the mold by opening the mold after the cooling step is finished (S7). Then, impurities existing around the heat sink are removed (S8).
  • FIG 4A is a perspective view of the fin arranged in a heat sink according to a first embodiment of the present invention
  • FIG 4B is a perspective view of the mold for manufacturing the heat sink according to the first embodiment of the present invention
  • FIG 4C is a sectional view taken along the line C-C of FIG. 4B.
  • the method for manufacturing the heat sink according to the first embodiment of the present invention uses an insert molding technique of the fins to obtain the heat sink. That is, after inserting the fins into the mold, molten metal is injected into the mold, thereby manufacturing the heat sink.
  • the fin 10 is manufactured through extruding, cutting, pressing, sintering, injecting or casting process and the mold including the upper mold 30 and the lower mold 20 is prepared. At this time, plural inserting portions 25 for receiving plural fins 10 are manufactured in the lower mold 20, and a cavity 35 for manufacturing the heat sink base 40 is manufactured in the upper mold 30.
  • the upper mold 30 is placed on an upper surface of the lower mold 20 so as to be coupled to the lower mold 20, and molten metal having the superior thermal conductivity, such as aluminum alloy, is injected into the mold.
  • molten metal having the superior thermal conductivity such as aluminum alloy
  • FIGS. 5 A and 5B The heat sink manufactured through the above process is shown in FIGS. 5 A and 5B.
  • the heat sink base is integrally manufactured with the fins. Therefore, an air layer is not manufactured between the fins and the heat sink base, so that the heat insulation effect caused by the air layer can be prevented.
  • the inserting portions 25 are manufactured in the lower mold, and the cavity 35 is manufactured in the upper mold 30 for manufacturing the heat sink base, the present invention is not limited to the above-mentioned structure.
  • FIG. 6 is a flow chart showing the method for manufacturing the heat sink according to the second embodiment of the present invention.
  • the fins used in the heat sink are manufactured through various processes, such as extruding, cutting, pressing, sintering, injecting or casting process (S10). Then, a plurality of partition plates for uniformly arranging the fins are manufactured (S20).
  • the fins are positioned between the partition plates and securely fixed thereto by means of a hydraulic pressing device (S30).
  • the upper mold for manufacturing the base of the heat sink is placed on the upper surface of the lower mold so as to be coupled with the lower mold (S40).
  • metal having a superior thermal conductivity such as aluminum alloys or magnesium is molten and injected into the upper mold (S50).
  • step (S50) air existing in the mold is discharged out of the mold by molten metal, so a gap is not manufactured between the base of the heat sink and the fins. Therefore, an insulation layer, such as an air layer, is not manufactured between the base of the heat sink and the fins, so the heat emitting effect is improved.
  • Molten metal injected into the mold is solidified as time lapses so that the heat sink base is manufactured. Then, the heat sink base is cooled such that the heat sink base is integrally manufactured with the fins (S60).
  • the heat sink, in which the fins and the base are integrally manufactured with each other, is separated from the mold by opening the mold after withdrawing the partition plates (S70). Then, impurities existing around the heat sink are removed (S80).
  • FIG 7 is a perspective view of an injection mold for manufacturing the heat sink according to the second embodiment of the present invention
  • FIG 8 A is a perspective view of the heat sink manufactured by using the injection mold shown in FIG. 7
  • FIG 8B is an enlarged view of a predetermined portion of the heat sink shown in FIG. 8 A.
  • a plurality of fins 10 manufactured through extruding, cutting, pressing, sintering, injecting or casting process and a plurality of partition plates 15 are prepared.
  • the injection mold includes an upper mold, a lower mold and a hydraulic pressing device 70 slidably installed at one side of the lower mold 50.
  • the fins 10 are inserted between the partition plates 85. Then, the partition plates 85 and the fins 10 are pressed against to each other by means of the hydraulic pressing device 70, such that a gap is not manufactured between them.
  • the arrangement of the fins 10 and the partition plates 85 is shown in FIG. 8B as an enlarged view.
  • molten metal having a superior thermal conductivity such as aluminum alloy
  • molten metal having a superior thermal conductivity such as aluminum alloy
  • air existing in the mold is discharged out of the mold caused by the injection of molten metal into the mold.
  • Molten metal injected into the upper mold 60 is solidified so that the heat sink base is manufactured.
  • the heat sink base is integrally manufactured with the fins 10 inserted into the lower mold 50.
  • the heat sink manufactured through the above process is shown in FIG. 9.
  • a method for manufacturing the heat sink according to a third embodiment of the present invention will be described.
  • the method for manufacturing the heat sink according to the third embodiment of the present invention is similar to the method for manufacturing the heat sink according to the second embodiment, except for a step of manufacturing an auxiliary heat sink 90, which is mounted on the upper mold.
  • FIG. 10 is a flow chart showing the method for manufacturing a heat sink according to the third embodiment of the present invention
  • FIG 11 is a perspective view of the heat sink manufactured by using the injection mold shown in FIG. 7 according to the third embodiment of the presented invention
  • FIG 12 is a perspective view of the heat sink manufactured by the method according to the third embodiment of the present invention.
  • the method for manufacturing the heat sink according to the third embodiment of the present invention includes a step of manufacturing the auxiliary heat sink 90 (S21) after manufacturing a plurality of partition plates (S20).
  • a step of fixedly inserting the auxiliary heat sink into the upper mold (S31) is added after arranging fins between the partition plates and fixing them by using the hydraulic pressing device (S30).
  • the plural partition plates 85 are arranged on the lower mold 50 and fins 10 are inserted between the partition plates 85.
  • the fins 10 and the partition plates 85 are press-fixed to each other by means of the hydraulic pressing device 70, such that a gap is not manufactured between them.
  • the auxiliary heat sink 90 is fixedly inserted into a recess of the upper mold 60.
  • the upper mold is assembled with the lower mold and molten metal is injected into the mold. Accordingly, the auxiliary heat sink is integrally manufactured at a predetermined portion of the heat sink base 40, so that the heat emitting effect is more improved.
  • the heat sink having the auxiliary heat sink 90 is shown in FIG. 12.
  • the method for manufacturing the heat sink according to the present invention can achieve the heat sink having the superior heat emitting effect capable of effectively emitting heat generated from the modules in various telecommunication relays with being easily manufactured. While the present invention has been described in detail with reference to the preferred embodiment thereof, it should be understood to those skilled in the art that various changes, substitutions and alterations can be made hereto without departing from the scope of the invention as defined by the appended claims.

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  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

Disclosed are a heat sink used for emitting heat generated from a module installed in various telecommunication relays, and a method for manufacturing the heat sink having a superior heat emitting effect with being easily manufactured. According to the method for manufacturing the heat sink, fins are integrally inserted into a heat sink base. The fin is manufactured through various processes, such as extruding, cutting, pressing, sintering, injecting or casting process. The fins are inserted into a mold manufacturing the sink base. The heat sink base made of aluminum or stuff having a superior thermal conductivity is manufactured in the mold, so that the fins and the heat sink base are integrally manufactured without manufacturing an air layer therebetween.

Description

HEAT SINK AND METHOD FOR MANUFACTURING THE SAME
Technical Field
The present invention relates to a heat sink and a method for manufacturing the same, and more particularly to a heat sink used for emitting heat generated from modules in various telecommunication relays and a method for manufacturing the same.
Background Art
Recently, as the telecommunication market has achieved a rapid growth over the past few years, it is possible to transmit large capacity of data. To this end, there is required to provide telecommunication relays for facilitating the wireless mobile telecommunication in long and short distances. Generally, the telecommunication relay receives signals from a wave source and transmits the signal to a base station by amplifying the signals into high frequency waves. As the IMT 2000 solution has been adopted, a module for treating data having large capacity, such as moving pictures, is accommodated in the mobile telecommunication. Heat is generated when the module treats the data having large capacity.
For this reason, a heat sink is provided to emit the heat from the module. In order to effectively emit the heat, various kinds of heat sinks are manufactured. However, there are many limits in shape, size and stuff of the heat sink when the heat sink is installed in the relay for emitting heat from the module. Particularly, the weight of the heat sink is seriously considered when manufacturing the heat sink because the relay can be broken by the weight of the heat sink.
FIGS.. 1A and IB show a conventional heat sink 110 manufactured by using an extruder 100. The heat sink 110 manufactured by the extruder 100 cannot effectively emit the heat when large quantity of heat is generated from the module in the relay. For this reason, there is required to provide a heat sink having fins, which are positioned higher than fins of the conventional heat sink 110 and are densely arranged. The extruding method cannot obtain the heat sink having the above features.
In order to solve the problems of the heat sink manufactured by the extruding method, there is suggested a method for manufacturing the heat sink by using a pressing process, capable of raising the height of the fins and densely arranging the fins. The structure of the heat sink manufactured by the pressing process is shown in FIGS. 2 A and 2B. According to the above pressing process, fins 120 are separately manufactured to improve the heat emitting effect. In addition, an upper surface of the heat sink base 130 is manufactured as a concave and convex structure. The fins 120 are inserted into the concave and convex structure of the base 130. Then, a pressing work is carried out with respect to a periphery of the inserting portion to adhere the fins to the base. However, according to the pressing method, an insulation layer, such as an air layer, is manufactured between the heat sink base 130 and the fins 120, so the heat to be emitted cannot be effectively transferred. For this reason, the pressing method is not adapted for manufacturing the heat sink used in various telecommunication relays having the module for treating data of large capacity, such as moving pictures.
Disclosure of the Invention
The present invention has been made to solve the above problems of the related art, therefore, it is an object of the present invention to provide a method for manufacturing a heat sink, which is used in a module of various telecommunication relays and capable of improving the heat emitting effect.
Another object of the present invention is to provide a method for manufacturing a heat sink, which can be easily manufactured and in which fins are densely arranged with each other. To achieve the above objects, according to a first embodiment of the present invention, there is provided a method for manufacturing a heat sink, the method comprising the steps of manufacturing fins used for the heat sink; manufacturing a plurality of fin inserting portions in a lower mold; inserting the fins into the fin inserting portions of the lower mold; coupling an upper mold for manufacturing a base of the heat sink with the lower mold having the fins inserted therein; melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold after the cooling step is finished; and removing impurities from a periphery of the heat sink.
To achieve the above objects, according to a second embodiment of the present invention, there is provided a method for manufacturing a heat sink, the method comprising the steps of: manufacturing fins used for the heat sink; manufacturing a plurality of partition plates for uniformly arranging the fins; arranging the partition plates on a lower mold, positioning the fins between the partition plates, and fixing the partition plates and the fins by using a hydraulic press fixing device; placing an upper mold for manufacturing a base of the heat sink on an upper surface of the lower mold; melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold and withdrawing the partition plates after the cooling step is finished; and removing impurities from a periphery of the heat sink.
In addition, the heat sink of the present invention is manufactured by the above methods.
Brief Description of the Drawings
The above objects, and other features and advantages of the present invention will become more apparent by describing preferred embodiments thereof with reference to the attached drawings in which:
FIG. 1A is a perspective view showing a heat sink manufactured by a conventional extruding method;
FIG. IB is a front view of the heat sink shown in FIG. 1 A;
FIG. 2A is a perspective view showing a heat sink manufactured by a conventional pressing method;
FIG. 2B is a front view of the heat sink shown in FIG. 2 A;
FIG. 3 is a flow chart showing a method for manufacturing a heat sink according to a first embodiment of the present invention;
FIG 4A is a perspective view of a fin arranged in a heat sink according to a first embodiment of the present invention;
FIG 4B is a perspective view of a mold for manufacturing a heat sink according to the first embodiment of the present invention; FIG 4C is a sectional view taken along the line C-C of FIG. 4B; FIG 5 A is a perspective view of a heat sink manufactured by a method according to the first embodiment of the present invention;
FIG 5B is a sectional view taken along the line D-D' of FIG. 5A; FIG. 6 is a flow chart showing a method for manufacturing a heat sink according to a second embodiment of the present invention;
FIG 7 is a perspective view of an injection mold for manufacturing a heat sink according to the second embodiment of the present invention;
FIG 8A is a perspective view of a heat sink manufactured by using the injection mold shown in FIG. 7;
FIG 8B is an enlarged view of a predetermined portion of the heat sink shown in FIG. 8A;
FIG 9 is a perspective view of a heat sink manufactured by a method according to the second embodiment of the present invention; FIG. 10 is a flow chart showing a method for manufacturing a heat sink according to a third embodiment of the present invention;
FIG 11 is a perspective view of a heat sink manufactured by using the injection mold shown in FIG. 7 according to the third embodiment of the presented invention; and
FIG 12 is a perspective view of a heat sink manufactured by a method according to the third embodiment of the present invention.
Best Mode for Carrying Out the Invention
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIGS. 3 to 5B are views for explaining a method for manufacturing a heat sink according to a first embodiment of the present invention.
FIG.. 3 is a flow chart schematically showing a method for manufacturing the heat sink according to the first embodiment of the present invention.
Referring to FIG. 3, the fins are manufactured through various processes, such as extruding, cutting, pressing, sintering, injecting or casting process (SI). Then, a plurality of inserting portions are manufactured in a lower mold into which the fins are inserted (S2). Then, after inserting the manufactured fins into the inserting portions of the lower mold (S3), an upper mold for manufacturing a base of the heat sink is coupled with the lower mold having the fins inserted therein (S4).
After that, metal having a superior thermal conductivity, such as aluminum alloys or magnesium is molten and injected into the upper mold (S5). In step (S5), air existing in the mold is discharged out of the mold by molten metal, so a gap is not manufactured between the base of the heat sink and the fins. Therefore, an insulation layer, such as an air layer, is not manufactured between the base of the heat sink and the fins, so the heat emitting effect is improved. Molten metal injected into the mold is solidified as time lapses so that the heat sink base is manufactured. Then, the heat sink base is cooled such that the heat sink base is integrally manufactured with the fins (S6). The heat sink, in which the fins and the base are integrally manufactured with each. other, is separated from the mold by opening the mold after the cooling step is finished (S7). Then, impurities existing around the heat sink are removed (S8).
FIG 4A is a perspective view of the fin arranged in a heat sink according to a first embodiment of the present invention, FIG 4B is a perspective view of the mold for manufacturing the heat sink according to the first embodiment of the present invention, and FIG 4C is a sectional view taken along the line C-C of FIG. 4B. The method for manufacturing the heat sink according to the first embodiment of the present invention uses an insert molding technique of the fins to obtain the heat sink. That is, after inserting the fins into the mold, molten metal is injected into the mold, thereby manufacturing the heat sink.
As shown in FIGS. 4 A to 4C, the fin 10 is manufactured through extruding, cutting, pressing, sintering, injecting or casting process and the mold including the upper mold 30 and the lower mold 20 is prepared. At this time, plural inserting portions 25 for receiving plural fins 10 are manufactured in the lower mold 20, and a cavity 35 for manufacturing the heat sink base 40 is manufactured in the upper mold 30.
Accordingly, after inserting fins 10 into the inserting portions 25 of the lower mold 20, the upper mold 30 is placed on an upper surface of the lower mold 20 so as to be coupled to the lower mold 20, and molten metal having the superior thermal conductivity, such as aluminum alloy, is injected into the mold. When injecting molten metal into the mold, air existing in the mold is pushed by molten metal, so air is discharged out of the mold. Then, molten metal remaining in the cavity 35 of the upper mold 30 is solidified, so that the heat sink base 40 is manufactured. At this time, the heat sink base is integrally manufactured with the fins 10 inserted into the inserting portions 25 of the lower mold 20. After the cooling step has been carried out, the upper mold 30 is separated from the lower mold 20 and impurities sticking to the heat sink are removed.
The heat sink manufactured through the above process is shown in FIGS. 5 A and 5B.
As shown in FIGS. 5A and 5B, since the heat sink is manufactured by using the fin insert molding technique, the heat sink base is integrally manufactured with the fins. Therefore, an air layer is not manufactured between the fins and the heat sink base, so that the heat insulation effect caused by the air layer can be prevented.
In addition, though it is illustrated that the inserting portions 25 are manufactured in the lower mold, and the cavity 35 is manufactured in the upper mold 30 for manufacturing the heat sink base, the present invention is not limited to the above-mentioned structure.
Hereinafter, a method for manufacturing the heat sink according to the second embodiment of the present invention will be described, in detail.
FIG. 6 is a flow chart showing the method for manufacturing the heat sink according to the second embodiment of the present invention. Referring to FIG. 6, the fins used in the heat sink are manufactured through various processes, such as extruding, cutting, pressing, sintering, injecting or casting process (S10). Then, a plurality of partition plates for uniformly arranging the fins are manufactured (S20).
Then, after installing the partition plates on the lower mold, the fins are positioned between the partition plates and securely fixed thereto by means of a hydraulic pressing device (S30). After that, the upper mold for manufacturing the base of the heat sink is placed on the upper surface of the lower mold so as to be coupled with the lower mold (S40).
After that, metal having a superior thermal conductivity, such as aluminum alloys or magnesium is molten and injected into the upper mold (S50). In step (S50), air existing in the mold is discharged out of the mold by molten metal, so a gap is not manufactured between the base of the heat sink and the fins. Therefore, an insulation layer, such as an air layer, is not manufactured between the base of the heat sink and the fins, so the heat emitting effect is improved. Molten metal injected into the mold is solidified as time lapses so that the heat sink base is manufactured. Then, the heat sink base is cooled such that the heat sink base is integrally manufactured with the fins (S60). The heat sink, in which the fins and the base are integrally manufactured with each other, is separated from the mold by opening the mold after withdrawing the partition plates (S70). Then, impurities existing around the heat sink are removed (S80).
FIG 7 is a perspective view of an injection mold for manufacturing the heat sink according to the second embodiment of the present invention, FIG 8 A is a perspective view of the heat sink manufactured by using the injection mold shown in FIG. 7, and FIG 8B is an enlarged view of a predetermined portion of the heat sink shown in FIG. 8 A.
Referring to FIGS. 7 to 8B, a plurality of fins 10 manufactured through extruding, cutting, pressing, sintering, injecting or casting process and a plurality of partition plates 15 are prepared.
Then, the fins 10 and partition plates 85 are arranged on the injection mold shown in FIG. 7. The injection mold includes an upper mold, a lower mold and a hydraulic pressing device 70 slidably installed at one side of the lower mold 50.
After arranging the plural partition plates 85 on the lower mold 50, the fins 10 are inserted between the partition plates 85. Then, the partition plates 85 and the fins 10 are pressed against to each other by means of the hydraulic pressing device 70, such that a gap is not manufactured between them. The arrangement of the fins 10 and the partition plates 85 is shown in FIG. 8B as an enlarged view.
Then, after assembling the upper mold 60 with the lower mold 50, molten metal having a superior thermal conductivity, such as aluminum alloy, is injected into the mold. While molten metal is being injected into the mold, air existing in the mold is discharged out of the mold caused by the injection of molten metal into the mold. Molten metal injected into the upper mold 60 is solidified so that the heat sink base is manufactured. At this time, the heat sink base is integrally manufactured with the fins 10 inserted into the lower mold 50. When molten metal has been solidified, the upper mold 60 is separated from the lower mold 50 and the partition plates 85 are withdrawn from the mold. After that, impurities sticking to the heat sink are removed.
The heat sink manufactured through the above process is shown in FIG. 9. Hereinafter, a method for manufacturing the heat sink according to a third embodiment of the present invention will be described.
The method for manufacturing the heat sink according to the third embodiment of the present invention is similar to the method for manufacturing the heat sink according to the second embodiment, except for a step of manufacturing an auxiliary heat sink 90, which is mounted on the upper mold.
FIG. 10 is a flow chart showing the method for manufacturing a heat sink according to the third embodiment of the present invention, FIG 11 is a perspective view of the heat sink manufactured by using the injection mold shown in FIG. 7 according to the third embodiment of the presented invention, and FIG 12 is a perspective view of the heat sink manufactured by the method according to the third embodiment of the present invention.
As shown in FIGS. 10 and 11, the method for manufacturing the heat sink according to the third embodiment of the present invention includes a step of manufacturing the auxiliary heat sink 90 (S21) after manufacturing a plurality of partition plates (S20). In addition, a step of fixedly inserting the auxiliary heat sink into the upper mold (S31) is added after arranging fins between the partition plates and fixing them by using the hydraulic pressing device (S30).
In detail, referring to FIG. 11, the plural partition plates 85 are arranged on the lower mold 50 and fins 10 are inserted between the partition plates 85. In this state, the fins 10 and the partition plates 85 are press-fixed to each other by means of the hydraulic pressing device 70, such that a gap is not manufactured between them. Then, the auxiliary heat sink 90 is fixedly inserted into a recess of the upper mold 60. After that, the upper mold is assembled with the lower mold and molten metal is injected into the mold. Accordingly, the auxiliary heat sink is integrally manufactured at a predetermined portion of the heat sink base 40, so that the heat emitting effect is more improved. The heat sink having the auxiliary heat sink 90 is shown in FIG. 12.
Industrial Applicability
As described above, the method for manufacturing the heat sink according to the present invention can achieve the heat sink having the superior heat emitting effect capable of effectively emitting heat generated from the modules in various telecommunication relays with being easily manufactured. While the present invention has been described in detail with reference to the preferred embodiment thereof, it should be understood to those skilled in the art that various changes, substitutions and alterations can be made hereto without departing from the scope of the invention as defined by the appended claims.

Claims

Claims 1. A method for manufacturing a heat sink, the method comprising the steps of: i) manufacturing fins used for the heat sink; ii) manufacturing a plurality of fin inserting portions in a lower mold; iii) inserting the fins into the fin inserting portions of the lower mold; iv) coupling an upper mold for manufacturing a base of the heat sink with the lower mold having the fins inserted therein; v) melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; vi) solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; vii) separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold after the cooling step is finished; and viii) removing impurities from a periphery of the heat sink.
2. A method for manufacturing a heat sink, the method comprising the steps of: i) manufacturing fins used for the heat sink; ii) manufacturing a plurality of partition plates for uniformly arranging the fins; iii) arranging the partition plates on a lower mold, positioning the fins between the partition plates, and fixing the partition plates and the fins by using a hydraulic press fixing device; iv) placing an upper mold for manufacturing a base of the heat sink on an upper surface of the lower mold; v) melting a metal substance having a superior thermal conductivity and injecting the molten metal substance into the upper mold; vi) solidifying the molten metal substance injected into the upper mold so as to manufacture the base of the heat sink and cooling the metal substance such that the base is integrally manufactured with the fins; vii) separating the heat sink, in which the fins and the base are integrally manufactured with each other, from the mold by opening the mold and withdrawing the partition plates after the cooling step is finished; and viii) removing impurities from a periphery of the heat sink.
3. The method as claimed in claim 2, wherein a step for manufacturing an auxiliary heat sink is carried out between steps ii) and iii), and a step for fixedly inserting the auxiliary heat sink into the upper mold is carried out between steps iii) and iv).
4. A heat sink manufactured by a method described in any one of claims 1 to 3.
PCT/KR2002/000526 2001-03-26 2002-03-26 Heat sink and method for manufacturing the same WO2002078417A1 (en)

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KR1020010015808A KR20020015261A (en) 2001-03-26 2001-03-26 Method of fin insert injection molding for Heat sink
KR2001/15808 2001-03-26

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EP1345266A1 (en) * 2001-12-07 2003-09-17 Sapa AB Heat sink with extended surface area
ITBO20090069A1 (en) * 2009-02-11 2010-08-12 Elenos S R L HEAT SINK FOR ELECTRONIC POWER COMPONENTS AND METHOD FOR THE PRODUCTION OF THE SAME
WO2012072388A1 (en) * 2010-11-29 2012-06-07 Osram Ag Heat radiation device and electronic device comprising the heat radiation device
WO2015094125A1 (en) * 2013-12-16 2015-06-25 Sieva, Podjetje Za Razvoj In Trženje V Avtomobilski Industriji, D.O.O. High performance heat exchanger with inclined pin fin aragnement means and a method of producing the same
ITUB20153416A1 (en) * 2015-09-04 2017-03-04 Mecc Al S R L A Socio Unico METHOD FOR REALIZING A THERMAL SINK, MACHINE TO ACTUATE THE METHOD AND THE SINK OBTAINED THROUGH THIS METHOD
CN110756714A (en) * 2019-11-10 2020-02-07 中国航发南方工业有限公司 High-speed extrusion forming die for blades

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KR20030073903A (en) * 2002-03-13 2003-09-19 (주)테놉스 Method for manufacturing the heat sink using insert casting of fin and auxiliary plate
KR20030073904A (en) * 2002-03-13 2003-09-19 (주)테놉스 Method for manufacturing the heat sink using insert casting of fin
KR20040021769A (en) * 2002-09-04 2004-03-11 (주)대영정공 A manufacturing method of heat sink
KR20040026943A (en) * 2002-09-26 2004-04-01 이종만 Method for manufacturing the heat sink using ultrasonic welding of fin
KR101207934B1 (en) * 2010-02-10 2012-12-04 주식회사 케이엠더블유 Structure of heat sink
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Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP1345266A1 (en) * 2001-12-07 2003-09-17 Sapa AB Heat sink with extended surface area
ITBO20090069A1 (en) * 2009-02-11 2010-08-12 Elenos S R L HEAT SINK FOR ELECTRONIC POWER COMPONENTS AND METHOD FOR THE PRODUCTION OF THE SAME
WO2012072388A1 (en) * 2010-11-29 2012-06-07 Osram Ag Heat radiation device and electronic device comprising the heat radiation device
WO2015094125A1 (en) * 2013-12-16 2015-06-25 Sieva, Podjetje Za Razvoj In Trženje V Avtomobilski Industriji, D.O.O. High performance heat exchanger with inclined pin fin aragnement means and a method of producing the same
ITUB20153416A1 (en) * 2015-09-04 2017-03-04 Mecc Al S R L A Socio Unico METHOD FOR REALIZING A THERMAL SINK, MACHINE TO ACTUATE THE METHOD AND THE SINK OBTAINED THROUGH THIS METHOD
CN110756714A (en) * 2019-11-10 2020-02-07 中国航发南方工业有限公司 High-speed extrusion forming die for blades

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