PBT/GF射出成型製程最佳化及挫屈特性研究

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蔡文偉(Wen-Wei Tsai) 查詢紙本館藏

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機械工程學系

論文名稱

PBT/GF射出成型製程最佳化及挫屈特性研究

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摘要(中)

本研究建立C-MOLD軟體與ABAQUS軟體間之整合介面程式，使射出成型模流分析與有限元素結構分析能一氣呵成。本研究以不同短玻璃纖維含量的聚丁烯對苯二甲酸酯（PBT/GF）複合材料為研究對象，應用田口實驗計畫法搭配C-MOLD軟體與ABAQUS軟體，有系統的探討射出成型條件對翹曲變形及挫屈力的影響，進而求得最小翹曲量及最大挫屈力的最佳射出成型製程參數。最後，探討因射出成型過程而產生不均勻材料性質、殘留應力分佈與溫度分佈之試片，其影響挫屈力的各種因素與挫屈力之間的關係。
研究結果顯示PBT/15 %GF於充填時間3秒、射速100 %、融膠溫度240℃與模具溫度80℃時具有最小的翹曲量；PBT/30 %GF於充填時間3秒、射速60 %、融膠溫度240℃與模具溫度95℃時具有最小的翹曲量，相對於成型條件範圍的中位數參數組合，其翹曲量改善分別為32.8 %及23.7 %。PBT/15 %GF與PBT/30 %GF材料相同於成型條件為充填時間3秒、射速20 %、融膠溫度240℃與模具溫度80℃時有最大的挫屈力，且第一主方向楊氏模數對挫屈力的影響最大，兩者成正比關係，其相關係數高達0.99以上。

關鍵字(中)

★ 射出成型
★ 殘留應力
★ 翹曲
★ 挫屈力
★ 最佳化

關鍵字(英)

★ Buckling
★ Warpage
★ Residual Stress
★ Injection
★ Optimum

論文目次

摘要 I
誌謝 II
總目錄 III
表目錄 V
圖目錄 VI
符號說明 VII
第一章前言 1
1-1 研究動機 1
1-2 研究目的 3
1-3 文獻回顧 3
第二章理論概述 9
2-1 射出成型充填及保壓過程 9
2-2 射出成型冷卻過程 13
2-3 射出成型過程之殘留應力 15
2-4 挫屈力理論概述 17
2-5 田口實驗計畫法 17
2-5-1 品質損失函數 18
2-5-2 直交表 20
2-5-3 信號雜訊比 21
第三章模流、翹曲與挫屈分析步驟 24
3-1 實驗材料 24
3-2 試片規格與模具設計 25
3-3 成型條件 25
3-4 模流分析 26
3-5 資料轉換 27
3-6 翹曲與挫屈力分析 29
第四章結果與討論 31
4-1 分析模式驗證 31
4-1-1 元數數量選取 31
4-1-2 殘留應力驗證 31
4-2 翹曲量分析結果 32
4-3 挫屈力分析結果 35
4-4 最佳製程預估與驗證 36
4-4-1 最佳製程預估 37
4-4-2 最佳製程驗證 38
4-5 變異數分析 40
4-6 挫屈力探討 43
4-6-1 翹曲量與挫屈力的關係 44
4-6-2 第一主方向楊氏模數與挫屈力的關係 44
4-6-3 軸向收縮與挫屈力的關係 45
4-6-4 橫向收縮與挫屈力的關係 45
第五章結論與未來發展方向 46
5-1 結論 46
5-2 未來發展方向 47
參考文獻 48

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指導教授

黃俊仁、陳俊生(Jiun-ren Hwang)

審核日期

2002-7-18

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