碩士 / 國立高雄第一科技大學 / 機械與自動化工程所 / 90 / Recently, the speed of the computer processor is getting faster and faster, which is followed by generation of a great deal of heat. How to eliminate the heat fast and effectively by using the heat conductive media is a topic worth to research. The efficiency of the heat sink depends on material properties and the effective heat surface area for conduction. Forging is the only process to increase the surface area of a heat sink to promote the efficiency of heat conductivity. In this study, the forward extrusion process variables of a heat sink of aluminum are investigated. First the CAE software, “DEFORM-3D”, is used to analyze the forward extrusion process and the variables in extrusion die design are investigated. Then, the optimum variables according to the results of CAE simulation are used to design the actual die and are certified by the forging experiment using A6061 aluminum alloy as the billet.
The results show that the forging loads are proportional to radii of die. When the land is 5mm, the fins of heat sink are the straightest. The load of 22 tons is the lowest and the fins are straightest when the radius is 0.5mm and the land is 5mm, which are the optimum variable in the CAE simulation. Then the optimum conditions are used to design the extrusion dies and proceed with the forging experiment. Not only the forging load but also the stress distribution and product appearance in the actual forging conform to those in the DEFORM simulation. Therefore, it is feasible that using the DEFORM software simulates the forging process to find the optimum variables previously and then the design of the forging die is proceeded according to the optimum variables.
| Identifer | oai:union.ndltd.org:TW/090NKIT5689003 |
| Date | January 2002 |
| Creators | Sang-Jung Yang, 楊尚融 |
| Contributors | Jin-Bin Yang, 楊俊彬 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 120 |
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