KR20030073904A - Method for manufacturing the heat sink using insert casting of fin - Google Patents

Abstract

PURPOSE: A method for manufacturing heat sink using insert casting of fin is provided to obtain superior radiating efficiency and complement pitch adjustment non-uniformity between fins generated when inserting fins into heat sink base mold and fin bending problem caused by melting pressure. CONSTITUTION: The method for manufacturing heat sink using insert casting of fin comprises step (S1) of fabricating fins used for the heat sink; step (S2) of processing gap adjusting plates for fixing and adjusting gap of the fins; step (S3) of fixing or inserting the gap adjusting plates into a heat sink base mold; step (S4) of inserting the fins between the gap adjusting plates; step (S5) of fixing the fins inserted between the gap adjusting plates using hydraulic press fixing unit; step (S6) of connecting upper mold or lower mold for molding the heat sink base to lower mold or upper mold into which the fins are inserted; step (S7) of injecting molten metallic material into the heat sink base mold by melting a metallic material having superior thermal conductivity after the mold connecting step (S6); step (S8) of integrating the fins with the heat sink base as the heat sink base is being formed by solidifying the injected molten material; step (S9) of separating the heat sink in which the fins and heat sink base are integrated into one body from the mold by opening the mold after completing solidification; and post processing step (S10) of removing foreign materials on the circumference of the heat sink.

Description

Method for manufacturing the heat sink using insert casting of {{Method for manufacturing the heat sink using insert casting of fin}

The present invention relates to a method of manufacturing a heat sink used for releasing heat generated in a device that may cause abnormalities in use if heat is generated during use, such as various communication repeaters, and the like. It relates to a method of manufacturing a heat sink having excellent heat dissipation efficiency.

Recently, as the communication market is rapidly growing, many data can be transmitted. Now, there is a demand for a communication repeater to smoothly communicate in a wireless mobile communication at a long distance and a short distance. In general, a communication repeater is a simple base station, and is a device that receives a signal generated as a radio wave source and amplifies and transmits the signal at high frequency. Such a communication repeater has a built-in module for processing a large amount of data, such as a video, in particular in the case of mobile communication IMT2000 method is commercialized, due to the performance of the module for large-capacity processing inevitably generates high heat.

As a result, heat sinks that remove heat from these modules are manufactured in various ways for more efficient heat dissipation.However, due to the space constraints to control the heat generation of the module in the repeater, There are many limitations.

The heat sink manufactured using extrusion is shown in FIG. 1 in the conventional technology for fabricating the heat sink to solve these problems. In the case of the heat dissipation plate manufactured by the extrusion manufacturing method, the heat generation amount of the module in the repeater increased, so that it was difficult to effectively dissipate all of them. Therefore, the heat sink specification has a high fin height, as well as the production of a heat sink having a high placement density between the fin and the fin has been required, there was a lot of difficulties in manufacturing this as an extrusion manufacturing method.

In order to improve the shortcomings of the heat sink manufacturing method using the extrusion, the heat sink structure using the press compression can be shown in Figure 2 to increase the height of the fin and increase the batch density between the fin and the fin.

This manufacturing method is to produce a fin (12) separately in order to increase the heat dissipation efficiency by making one side of the heat sink base 13 part uneven structure to insert a separately produced fin (12) into the uneven structure and then insert the fin (12) insertion site The press was used to press the fin (12) to the heat sink base (13) using a press process. However, this press press manufacturing method is used for the thermal insulation effect of the air layer existing between the heat sink base and the fin during pressing. The heat transfer efficiency to be dissipated is lowered, and there is a limitation in the method of manufacturing a heat sink in various communication repeaters incorporating a module for processing large data such as moving pictures.

Accordingly, in order to solve the above problems, the patent application 2001-15808 by the present applicant proposes a process of integrating the fin and the heat sink base, thereby providing a heat insulating layer that may exist between the fin and the heat sink base, which are inevitable in the conventional manufacturing method. By removing the to improve the heat transfer effect. However, in patent application 2001-15808, additional problems arise from fixing the fin in the process of fixing the fin to the heat sink base.

Accordingly, an object of the present invention devised to solve the problems of the prior arts described above is to provide a heat sink for dissipating heat generated from a module in various communication repeaters. This paper attempts to compensate for the problem of warpage of the fins due to the uneven pitch adjustment between the fins and the melt pressure during the insertion of the fins in the heat sink base mold of No. 15808.

1 is a structure of a heat sink manufactured using a conventional extrusion

Figure 1a is a perspective view for explaining the heat sink manufacturing method using extrusion

FIG. 1B illustrates View "A" in FIG. 1A

Figure 2 is a structure of a heat sink manufactured using a conventional press compression

Figure 2a is a perspective view for explaining the heat sink manufacturing method using press compression

FIG. 2B illustrates View "B" in FIG. 2A

Figure 3 is a flow chart for manufacturing the heat sink of the present invention

Figure 4 is a perspective view of the manufacturing method of the heat sink using the insert casting of the present invention

Figure 4a is a perspective view

4B is a perspective view of the spacing plate

Figure 4c is a perspective view of the heat sink base mold structure using insert casting

Figure 4d is a perspective view of the heat sink base mold structure showing the insert insert of the fin

FIG. 4E is an enlarged view of portion D of FIG. 4D

5 is a structure of a heat sink manufactured by the method of the present invention

5A is a perspective view of a heat sink

FIG. 5B is a cross-sectional view taken along the line D-D 'of FIG. 5A

-Explanation of symbols for the main parts of the drawings-

10: Extrusion mold

11: heat sink

12, 14, 19: 휜

13, 20: heat sink base

15: Spacing plate

16: Pictograph of heat sink base mold

17: Lower mold of heat sink base mold

18: hydraulic press fixing device

A heat sink manufacturing method using the insert casting of the fin of the present invention for achieving the above object comprises the steps of producing a fin for use in the heat sink (S1); Processing the spacing plate (S2); Fixing or inserting the spacer plate to the heat sink base mold (S3); Inserting the pin between the spacer plates (S4); Fixing the gaps inserted between the gap adjusting plates by using the hydraulic press fixing device (S5); Step S6 of combining the lower mold and the upper mold of the heat sink base mold; After the step of molding, the step of melting a metal material having good thermal conductivity and injecting the heat sink base mold (S7); Solidifying the injected molten material to form a heat sink base and integrating with the heat sink (S8); Opening the mold after the solidification is completed to separate the heat sink is combined with the completed fin and the heat sink base in the mold (S9); It is characterized by consisting of a post-processing step (S10) for removing the foreign matter around the heat sink.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows an overview of the present invention as a flow chart for a heat sink manufacturing method using the insert casting of the present invention at a glance.

First, by designing the specification of the fin to be used for the heat sink, and performing the step (S1) of manufacturing the fin by a manufacturing method such as compression, cutting, press molding, sintering, injection or casting, and to insert the produced fin heat sink base The step S2 of processing the spacer plate to be fixed to the mold is performed.

After performing the step (S3) of fixing or inserting the spacing plate to the heat sink base mold, and performing the step (S4) of inserting the 제작 produced in the manufacturing step between the spacing plate of the heat sink base mold, such as a hydraulic press A step S5 of fixing the gaps inserted between the gap adjusting plates is performed using the fixing device.

After performing the step (S6) of combining the lower mold and the upper mold into which the heat sink base is to be molded, and preferably, injecting aluminum alloy or other thermally conductive material into the heat sink base mold (S7). Go through). In the injecting step, the molten material releases all the air in the mold to the outside of the mold, thereby preventing the heat insulation effect caused by the presence of an air layer between the heat sink base and the fin, thereby providing a better heat dissipation efficiency.

The molten material injected into the heat sink base mold is solidified with time, and the heat sink base is formed to perform the step (S8) of integrating with the fin. After the solidification is completed, the mold is opened and the completed fin and the heat sink base are integrated into one. After performing the step (S9) of separating the heat sink from the mold through the post-processing step (S10) to remove the foreign matter around the heat sink to produce a heat sink.

Figure 4 shows a perspective view of the manufacturing method of the heat sink using the insert casting of the present invention, Figure 4a is a view of the production of a heat (14) produced by a method such as compression, cutting, press forming, sintering, injection or casting The shape is shown, and FIG. 4B shows the shape of the space adjusting plate 15.

FIG. 4C shows the shape of a heat sink base die consisting of three components, including an upper mold 16, a lower mold 17 and a hydraulic press device 18 for insert molding of a fin. A pin 14 is inserted into the lower mold 17 between the spacer adjusting plates 15 as shown in FIG. 4D and fixed using the hydraulic press device 18.

4E is an enlarged view of portion D of FIG. 4D.

After inserting the fin 14 into the lower mold of the heat sink base mold shown in FIG. 4D between the spacer adjusting plate 15 and fixing it with the hydraulic press device 18, the upper mold 16 and the lower mold 17 are joined together, and then aluminum (Al) Alloy or other thermally conductive melt is injected into the molded heat sink base mold. During injection, air in the mold is pushed out of the mold by being filled with the molten material to be filled, and the molten material in the upper mold 16 of the heat sink base mold is inserted into the lower mold 17 of the heat sink base mold while solidifying to form the heat sink base. Start to integrate with (14). After solidification is completed, the lower mold 17 of the heat sink base mold and the upper mold 16 of the heat sink base mold are separated and foreign substances are removed to complete the manufacture of the heat sink.

Figure 5 shows the structure of a heat sink produced using the insert casting of the present invention. Here, a heat sink having an integrated heat sink base 20 and a fin 19 structure as shown in FIG. 5A can be seen. FIG. 5B shows a cross section of a heat sink manufactured by the method of the present invention, in which there is no air layer present between the fin 19 and the heat sink base 20 produced in the heat sink manufactured by a conventional press crimping method. It is possible to obtain a heat sink that can prevent the thermal insulation effect.

Here, the fin insert formed on the lower mold 17 of the heat sink base mold is intended to show a preferred embodiment, and the formation of the fin insert is not limited to the upper mold 16 or the lower mold 17 of the heat sink base mold.

The mold is not limited to metal as the main material, and the hydraulic press is not limited to presses using only hydraulic pressure.

As described in detail above, the present invention provides a heat sink having excellent heat dissipation efficiency in manufacturing a heat sink for dissipating heat generated in a device that may cause abnormalities in use if heat is generated during use such as various communication repeaters. I can make it.

Claims (1)

In the manufacturing method of the heat sink, Manufacturing a fin for use in a heat sink (S1); Processing the gap adjusting plate for adjusting and fixing the gap (S2); Fixing or inserting the spacer plate to the heat sink base mold (S3); Inserting between the spacer plates (S4); Fixing the gaps inserted between the spacer plates by using the hydraulic press fixing device (S5); Step (S6) of joining the upper mold or lower mold to mold the heat sink base with the lower mold or the upper mold in which the fin is inserted; After the step of molding, the step of melting a metal material having good thermal conductivity and injecting the heat sink base mold (S7); Solidifying the injected molten material to form a heat sink base and integrating with the heat sink (S8); Opening the mold after the solidification is completed to separate the heat sink is combined with the completed fin and the heat sink base in the mold (S9); And Method for manufacturing a heat sink using insert casting of k as characterized in that the post-processing step (S10) to remove the foreign matter around the heat sink.