碩士 / 長庚大學 / 機械工程研究所 / 94 / The research uses linear-low-density polyethylene (LLDPE) to proceed rotational molding experiment. In this paper, the application of 3 kind of extended surfaces is investigated. The objective of this work is to achieve enhancement in convective heat transfer to mold exteriors and ultimately to reduce production cycle times. We use thermocouple and temperature indictor to measure inside air temperature and then compare efficiency between all kinds of fin and no fin mold. Besides, we observe the effect of different processing factors on fin efficiency and rotationally molded parts. The controlled parameters include the weight of LLDPE , heating oven temperature, cooling velocity , rotation velocity of processing.
The experiment result shows that the application of fin at mold exteriors can enhance heating efficiency, and it reduces the cooling time. Pin fin has the best efficiency, the next is triangle fin, the enhancement of rectangular fin is littlest. We deduce that it maybe their difference of surface area.
The research also uses ANSYS software to simulate inside air temperature curve. The simulation results for mold wall temperature agreed well with the experimental data under all of the conditions
tested. The largest discrepancy between the model and the data appears to be due to the status of LLDPE in the simulation and experimental inaccuracy.
| Identifer | oai:union.ndltd.org:TW/094CGU00489015 |
| Date | January 2006 |
| Creators | Guan-Hua Fu, 傅冠華 |
| Contributors | Shih-Jung Liu, 劉士榮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 108 |
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