Study of the Establishment Gas-Assisted Heating Applied on the Part Qualities of Injection Molded Parts
| Autor: | Chan-Yuan Tsao, 曹展源 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 In order to improve the quality requirements of the products, high mold temperature control technology provided the most effective way. Gas-assisted mold heating was used for rapid mold surface heating. Maintaining high mold temperature during the filling process is used to improve the polymer completely filling and reduce or eliminate many traditional molding problems. In this study, the model of gas-assisted mold heating is internal with mold temperature control system. The parameters of the process including gas flow rate, gap of air channel and heating time. The next, the heating efficiency is compared between internal and external of gas assisted heating method and using CFD-ACE analysis to simulate and verity the experiments result. Finally, the real injection molding combine with gas-assisted mold heating was used mold micro features, carbon fiber composite materials and glass fiber composite materials. As a result, with the increase of heating time, the heating temperature is increase. With the increase of gas flow rate, the heating speed is increase. The larger gap of air channel could get the more uniform temperature distribution. Using external gas-assisted mold heating, it takes 12, 27 and 83seconds to increase the mold temperature from 60℃ to 100℃, 120℃ and 140℃, respectively. Using internal gas-assisted mold heating, it just needs 1, 1.5 and 2 seconds, respectively. The heating speed could reach 40 ℃/s. CFD software can successful establish mold temperature field analysis. In the real injection molding case can improve the replication accuracy (17%) in molding micro features and the part surface gross of molding carbon fiber composite materials and glass fiber composite materials. For molding carbon fiber composite materials, it also can lower in-plane conductivity 34% ~ 43% and lower through-plane resistance 33%. Hence, the experiment results show significant feasibility and high potential in injection molding application. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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