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題 名 | 射出成型充填過程中邊界凝固層的影響研究 |
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作 者 | 廖明癸; 李常聲; | 書刊名 | 力學 |
卷 期 | 11:1 1995.03[民84.03] |
頁 次 | 頁1-9 |
分類號 | 440.13 |
關鍵詞 | 兩相流; 變厚度; 固化層; 收縮與變形; Two-phase flow; Various gap sizes; Solidification layer; Warpage and shrinkage; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究的目的在發展一套兩相流數值模擬程式,交錯使用有限元素法與有限差分 法模擬射出成型充填過程中的流動行為,以及塑料因接觸冷模具固化的現象。使用泛牛頓流 體模式模擬非牛頓高分子流體在高溫,高壓下,被射入低溫模穴之過程,並利用可壓縮流體 流動模式及增加凝固層的考慮來模擬塑料凝固密度的變化。在試驗方面,本文範例以聚丙烯 PP 為充填材料, 針對中間澆口變厚度平板模穴進行試射,並配合射出機臺射壓的變化當作 數值分析之初始條件。結果發現充填末期塑料固化層竟達厚度之 10 %∼ 20 %,嚴重影響 流動阻力的預估,此一現象勢將主導未來預測塑件收縮與變形度的研究。 |
英文摘要 | The behavior of viscous fluid flow in the filling stage of injection molding was studied using hybrid scheme of finite element and finite difference method to solve the two-phase flow hypothesis in which the solidified phenomenon of the melt is the key point of the study. Compressible generalized Newtonian flow model is considered to model the characteristic of non-Newtonian flow which is injected into cold mold under high pressure and temperature. The growth of boundary solidification layer and variation of polymeric density are verified. Engineering plastic PP is injected into flat cavity of various gap sizes from the central gate, at same time, the measured pressure at the nozzle of injection machine is used as the initial condition of numerical calculation. The maximum thickness of the boundary solidification layer could be up to 10%-20% at the end of filling stage, which will seriously affect the fluid resistance, as indicted from the experimental result and theoretical simulation. The result is important in the prediction of the warpage and shrinkage of injection molded products in the future. |
本系統中英文摘要資訊取自各篇刊載內容。