METHOD OF MANUFACTURING HEAT SINK PLATE
A heat sink manufacturing method includes the steps of positioning a heat conductive sheet on a lower half holding tool of a powder feeder; tightly closing and connecting an upper half holding tool of the power feeder to the lower half holding tool, such that spacers downward extended from the upper half holding tool are in tight contact with the heat conductive sheet; dispensing metal powder on the heat conductive sheet via a powder inlet on the upper half holding tool and under a positive pressure while vibrating the heat conducting sheet for the metal powder to uniformly distribute on the heat conductive sheet; opening the upper half holding tool and spraying an organic liquid on the metal powder for the same to set; and removing the heat conductive sheet from the lower half holding tool and sintering the metal powder to the heat conductive sheet.
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The present invention relates to a method of manufacturing heat sink plate, and more particularly to a heat sink plate manufacturing method that requires only reduced tool and assembling costs while enables copper powder to uniformly distribute on and be sintered to the heat sink plate.
BACKGROUND OF THE INVENTIONWith the progress in the scientific and technological fields, the currently available electronic devices have higher and higher operating performance and also produce more heat during the operation thereof. Therefore, the demand for heat sinks with increased heat dissipation efficiency also increases. To enable increased heat dissipation efficiency, most of the conventional heat sinks include a plurality of stacked radiating fin assemblies. Therefore, a lot of manufacturers have engaged in the research and development in radiating fins, and high-efficiency heat sinks have become the most important target in the industrial field now.
Taking a computer as an example, the central processing unit (CPU) thereof produces the largest part of heat in the computer. The CPU will have reduced performance when the heat produced by it constantly increases. When the heat accumulated in the CPU exceeds a high limit, it will result in shutdown or other serious damages of the computer. Moreover, to solve the problem of electromagnetic wave radiation, all important components and parts of the computer are enclosed in a computer case. Therefore, it is a very important issue to quickly remove the heat produced by the CPU and other electronic elements of the computer from the computer case.
Currently, a heat sink plate is frequently used with processors, chips and illuminating devices for dissipating the heat produced during the operation of these items. The heat sink plate has high thermal conductivity, quick heat transfer and large contact area with heat-producing elements, and does not consume electric power, and is therefore very suitable for use with heat-producing elements to transfer and dissipate the heat produced by the heat-producing elements.
According to the currently available heat sink plate, it mainly includes two copper sheets connected to each other. Between the two copper sheets, copper powder is distributed and a plurality of spacers is provided. The spacers are firmly arranged between and connected to the two copper sheets, and the copper powder is uniformly located around the spacers. In brief, the conventional heat sink plate involves complicated manufacturing procedures to complete it.
associating a central mould with a copper sheet (step S11);
filling metal powder between the central mould and the copper sheet (step S12);
vibrating the copper sheet and the central mould (step S13);
sintering the central mould and the copper sheet that have the metal powder filled therebetween (step S14); and
removing the central mould from the copper sheet after the sintering (step S15).
According to the above-described conventional technique for manufacturing the heat sink plate, the central mould is associated with the copper sheet that serve as an upper or a lower metal cover. Then, the metal powder is filled between the central mould and the copper sheet, and the copper sheet and the central mould are vibrated to uniformly distribute the metal powder therebetween. Thereafter, the central mould and the copper sheet along with the uniformly distributed metal powder are positioned in a sintering furnace and sintered at high temperature. After the high-temperature sintering, the metal powder forms a layer of capillary structure on an inner surface of the copper sheet. Finally, the central mould is removed from the copper sheet. In the sintering furnace, there is a plurality of copper sheets positioned in the sintering furnace at the same time for sintering, and each of the copper sheets has one central mould associated therewith. Therefore, a plurality of central moulds is needed to enable sintering a plurality of copper sheets and metal powder at the same time. As a result, high costs are required to prepare a large number of central moulds and filling the metal powder. Moreover, since it is necessary to form a plurality of recesses on the sintered copper sheet at the sintered metal powder, a plurality of extended posts must be provided on the central mould for forming such recesses. Before the sintering is completed, the central mould must not be removed from the copper sheet, lest the metal powder should shift to and thereby eliminate the spaces in the recesses due to any movement of the copper sheet. This also necessitates the copper sheet to be sintered along with the central mould.
In brief, the conventional heat sink plate manufacturing method has the following disadvantages: (1) requiring high mould cost; (2) involving troublesome manufacturing procedures; and (3) increasing the overall manufacturing cost of the heat sink plate.
It is therefore tried by the inventor to develop an improved heat sink plate manufacturing method to overcome the problems in the prior art.
SUMMARY OF THE INVENTIONA primary object of the present invention is to provide a heat sink plate manufacturing method that enables reduced tools and accordingly, reduced tool cost.
Another object of the present invention is to provide a heat sink plate manufacturing method that has simplified procedures to save the manufacturing and assembling costs.
A further object of the present invention is to provide a heat sink plate manufacturing method that effectively enables uniform distribution of metal powder on the heat sink plate.
A still further object of the present invention is to provide a heat sink plate manufacturing method that is able to effectively prevent the heat conductive sheets for forming the heat sink plate from moving during the manufacturing process, and accordingly, prevents the metal powder from shifting before being sintered to the heat conductive sheets.
A still further object of the present invention is to provide a heat sink plate manufacturing method that ensures good levelness of the manufactured heat sink plate.
To achieve the above and other objects, the heat sink plate manufacturing method of the present invention includes the steps of positioning a heat conductive sheet on a lower half holding tool of a powder feeder; tightly closing and connecting an upper half holding tool of the power feeder to the lower half holding tool, such that spacers downward extended from the upper half holding tool are in tight contact with the heat conductive sheet; dispensing metal powder on the heat conductive sheet via a powder inlet on the upper half holding tool while vibrating the heat conducting sheet for the metal powder to uniformly distribute on the heat conductive sheet; opening the upper half holding tool and spraying an organic liquid on the metal powder for the same to set on the heat conductive sheet; and removing the heat conductive sheet from the lower half holding tool and sintering the metal powder to the heat conductive sheet.
With the heat sink plate manufacturing method of the present invention, only reduced tool and assembling costs are required; the metal powder can be uniformly distributed on the heat conductive sheets; and the problem of shifting metal powder in the process of manufacturing due to moved heat conductive sheets can be effectively prevented.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
Please refer to
As shown in
positioning a heat conductive sheet 2 on a lower half holding tool 11 of a powder feeder 1 (step S21);
tightly closing and connecting an upper half holding tool 12 of the power feeder 1 to the lower half holding tool 11 (step S22);
dispensing metal powder 3 on the heat conductive sheet 2 while vibrating the heat conducting sheet 2, so that the metal powder 3 is uniformly distributed on the heat conductive sheet 2 (step S23);
opening the upper half holding tool 12 and spraying an organic liquid 4 on the metal powder 3 that has been uniformly distributed on the heat conductive sheet 2 (step S24); and
removing the heat conductive sheet 2 from the lower half holding tool 11 and sintering the metal powder 3 to the heat conductive sheet 2 (step S25).
In the illustrated first embodiment, the heat conductive sheet 2 is a copper sheet. As can be seen from
With the heat sink manufacturing method according to the first preferred embodiment of the present invention, the heat sink plate can be manufactured with reduced tools and simplified procedures. The method of the present invention can effectively overcome the problems of shifting metal powder when the heat conductive sheets are moved in the process of manufacturing. Moreover, as shown in
Please refer to
Moving a lower half holding tool 11 of a powder feeder 1 to an outer side of the powder feeder 1 via a sliding mechanism 13 thereof (step S31);
positioning a heat conductive sheet 2 on the outward moved lower half holding tool 11 of the powder feeder 1 (step S32);
tightly closing and connecting an upper half holding tool 12 of the power feeder 1 to the lower half holding tool 11, and using the sliding mechanism 13 to move the closed lower and upper half holding tools 11, 12 back into the powder feeder 1 (step S33);
dispensing metal powder 3 on the heat conductive sheet 2 while vibrating the heat conducting sheet 2, so that the metal powder 3 is uniformly distributed on the heat conductive sheet 2 under a positive pressure (step S34);
moving the closed lower and upper half holding tools 11, 12 out of the powder feeder 1 via the sliding mechanism 13, and opening the upper half holding tool 12 and spraying an organic liquid 4 on the metal powder 3 that has been uniformly distributed on the heat conductive sheet 2 (step S35); and
removing the heat conductive sheet 2 from the lower half holding tool 11 and sintering the metal powder 3 to the heat conductive sheet 2 (step S36).
As can be best seen from
With the heat sink manufacturing method according to the second preferred embodiment of the present invention, the heat sink plate can be manufactured with reduced tools and simplified procedures. The method of the present invention can uniformly distribute the metal powder 3 on the heat conductive sheet 2 and effectively overcome the problem of shifting metal powder when the heat conductive sheet is moved in the process of manufacturing. Moreover, as shown in
According to the above description, it can be found the heat sink manufacturing method according to the present invention has the following advantages: (1) requiring only reduced tools; (2) requiring reduced assembling cost; (3) enabling uniform distribution of the metal powder on the heat conductive sheets; (4) effectively preventing the metal powder from shifting in the process of manufacturing; and (5) enabling the heat conductive sheets undergone sintering to have good levelness.
Claims
1. A method of manufacturing heat sink plate, comprising the steps of:
- positioning a heat conductive sheet on a lower half holding tool of a powder feeder;
- tightly closing and connecting an upper half holding tool of the power feeder to the lower half holding tool;
- dispensing metal powder on the heat conductive sheet while vibrating the heat conducting sheet, so that the metal powder is uniformly distributed on the heat conductive sheet; and
- opening the upper half holding tool and removing the heat conductive sheet from the lower half holding tool, and sintering the metal powder to the heat conductive sheet.
2. The method of manufacturing heat sink plate as claimed in claim 1, wherein the metal powder is dispensed on the heat conductive sheet under a positive pressure.
3. The method of manufacturing heat sink plate as claimed in claim 1, wherein the upper half holding tool is provided with a powder inlet, and the metal powder is dispensed onto the heat conductive sheet via the powder inlet.
4. The method of manufacturing heat sink plate as claimed in claim 1, further comprising a step of spraying an organic liquid on the metal powder uniformly distributed on the heat conductive sheet before the heat conductive sheet is removed from the lower half holding tool for sintering.
5. The method of manufacturing heat sink plate as claimed in claim 4, wherein the organic liquid is a metal-powder-affinity liquid enabling the metal powder having the organic liquid sprayed thereon to set on the heat conductive sheet.
6. The method of manufacturing heat sink plate as claimed in claim 5, wherein the organic liquid is selected from the group consisting of alcohol and acetone.
7. The method of manufacturing heat sink plate as claimed in claim 1, wherein the upper half holding tool is provided on a lower side with a plurality of spacers, the spacers being in tight contact with the heat conductive sheet when the upper half holding tool is closed onto the lower half holding tool, such that a plurality of recesses are formed on the heat conductive sheet when the metal powder is distributed on the heat conductive sheet.
8. The method of manufacturing heat sink plate as claimed in claim 1, wherein the metal powder is selected from the group consisting of copper powder and aluminum powder.
9. The method of manufacturing heat sink plate as claimed in claim 1, further comprising a step of causing the powder feeder to drive the lower half holding tool to vibrate, so as to vibrate the heat conductive sheet, and a duration of vibrating the lower half holding tool being settable on the powder feeder.
10. The method of manufacturing heat sink plate as claimed in claim 1, wherein the powder feeder includes a sliding mechanism provided below the lower half holding tool for moving the lower half holding tool into and out of the powder feeder in the process of manufacturing the heat sink plate.
Type: Application
Filed: Jan 13, 2010
Publication Date: Jul 14, 2011
Applicant: ASIA VITAL COMPONENTS CO., LTD. (Sinjhuang City)
Inventor: Hsiuwei Yang (Sinjhuang City)
Application Number: 12/687,083
International Classification: B22F 7/04 (20060101);