Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1572
標題: 薄PMMA射出成型品之翹曲變形與雙折射效應
Warpage Deflection and Birefringence of a Thin PMMA Injection-Molded Product
作者: 賴祐杰
Lai, You-Jie
關鍵字: PMMA,;聚甲基丙烯酸甲酯;injection molding;birefringence;warpage;射出成型;雙折射;翹曲變形
出版社: 機械工程學系所
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摘要: 
此論文中之研究工作包含設計與製作完成一組具長方體模穴之塑膠射出成型模具,模穴之長寬高為62.5 x 25 x 2 mm,此模穴可進行抽真空。光學級之聚甲基丙烯酸甲酯(PMMA)為實驗塑料,射出速度、保壓壓力及模具溫度為實驗中之三個變數,射出成型品分別經三次元平面度之量測及光彈實驗之觀察,前者探討射出成型條件對成型品翹曲變形之影響,後者則觀察射出成型條件對成型品雙折射光學性質之影響,研究中同時討論抽真空模具在設計上必須注意的重點。在翹曲變形之研究方面,由實驗所得之結果顯示,模具溫度越高,成型品之翹曲變形量越大;射出速度對翹曲變形則無明顯之影響;在中低模溫時(35℃與50℃),成型品之翹曲變形量隨著保壓壓力之上昇有變小之趨勢,而在高模溫下(80℃),成型品之翹曲變形量則會隨著保壓壓力之上昇而趨變大。在光彈實驗之觀察方面,由實驗之結果亦得知,保壓壓力為影響成型品雙折射現象最為主要之因素,保壓壓力之增高則會增加雙折射現象之產生,在保壓壓力低於30%之狀態下,成型品上嚴重地受雙折射現象影響之範圍則僅限於澆口附近之小區域中;而模具溫度與射出速度對成型品雙折射現象之影響則相對地較為輕微。此研究中試片之厚度為2 mm,在此情況下,模穴之抽真空對成型品之雙折射現象並未有明顯之影響。

An injection mold with a rectangular cavity (62.5*25*2 mm) was designed and manufactured. The mold cavity can be vacuumized during injection molding. The key points in the mold design to achieve a gastight condition for the cavity is discussed. Injection rate, packing pressure and mold temperature were the three variables in the experiment. The specimen were measured by a coordinate measuring machine (CMM) and a polariscope respectively. The warpage deflection and birefringence were obtained. For the CMM measurement, the result reveals that the warpage deflection increases with the mold temperature. The effect of injection rate on the warpage deflection appears to be insignificant. For lower mold temperatures (35℃and 50℃), the warpage deflection decreases with an increase of the packing pressure;for a higher mold temperature (80℃), on the contrary, the warpage deflection increases with the packing pressure. For the polariscope measurement, the result indicates that the packing pressure is the most important factor affecting the birefringence. The birefringence appears to increase with the packing pressure. For operations with the packing pressure less than 30%, only a small region near to the injection gate would have a significant birefringence effect. The mold temperature and injection rate also affect the birefringence. However, their effects are minor. In the present consideration, the thickness of the specimen is 2 mm. For this condition, the application of the vacuum process to the mold cavity does not improve either warpage deflection or birefringence.
URI: http://hdl.handle.net/11455/1572
其他識別: U0005-1107200617201100
Appears in Collections:機械工程學系所

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