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題名 | A study of the Polymer Melt Compressible Flow and Pressure Development During the Post-Filling Stage of Injection Molding Process=射出成型後充填過程熔態高分子可壓縮性流動以及模穴內壓力變化之研究 |
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作者 | 陳夏宗; 鄭年添; 鄧治東; |
期刊 | 中原學報 |
出版日期 | 19901200 |
卷期 | 19 1990.12[民79.12] |
頁次 | 頁97-112 |
分類號 | 472.22 |
語文 | eng |
關鍵詞 | 充填; 可壓縮性; 流動; 射出成型; 高分子; 過程; 熔態; 模穴; 壓力; |
中文摘要 | 本文針對射出成型後充填過程中,熔態高分子流體的可壓縮流動以及模穴內壓力發展變化的過程作模擬分析,以找出影響製程中的關鍵因素。本研究發現高分子的黏度在保壓過程中決定了模穴中壓力上昇的速度而在冷卻的階段裡壓力--體積--溫度關係式則決定了壓力的變化。因此精密的後充填分析須考慮適用於高分子的非牛頓流體模型,以及黏度對溫度及壓力的變化。同時適當的壓力--體積--溫度模型也是必須的。本研究以非等溫黏性可壓縮流體為理論基礎,利用有限元素作數值處理,因此後充填模擬分析可在實際模具設計的過程中對於塑膠成品的品質作預測和評估。 |
英文摘要 | Simulation of the post-filling process has been developed and performed to study the compressible polymer melt flow during the packing phase and the pressure development inside the mold cavity for the entire post-filling process. It has been found that the viscosity is the key factor governing the speed of the pressure build-up during the very short interval (~10-2 seconds) of the packing process. However, the pressure development in the later post-filling process or the cooling stage is basically dominated by the pressure-volume-temperature equation of state. For an accurate simulation of the post-filling process, a viscosity model considering the non-Newtonian behavior of the polymer melt, the temperature and pressure dependent effects and an appropriate PVT formulation is required. In the present study, a finite element scheme is implemented to solve the non-isothermal, compressible viscous fluid flow equations such that the analysis can be applied to the injection molded part of complex geometry for the prediction of the part quality during the actual mold design process. |
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