氣體輔助射出成形技術，適合厚薄比大的產品，氣體穿透塑料使成品內部成中空狀態，能有效降低成本及節省材料，同時亦能撐開產品表面凹陷，並降低體積收縮率。本研究應用在減重和降低體積收縮且有良好的效果，並加入田口實驗法，針對製程缺點找出最佳化因子參數組合，再利用CAE 進行實驗分析，以模流分析軟體(Moldex 3D)預測塑料流動，以及氣體的動態充填情形、因子參數組合與機台參數等結果。

Gas assisted injection molding was suitable to design the product that has a relatively large difference in thickness. Filling the gas in plastic materials during processing, can make the plastic hollow and form the desired shape, then cost down and reduce material effectively. This study reveals that Moldex 3D is the good CAE software to analyze and make product more lightly as well as to decrease volume shrinkage rate. In addition, the Taguchi method was used to evaluate the volume shrinkage problem in order to maximize the process parameters. The results indicate that plastic material, dynamic filling of gas, gate, reducing cycle time of production and
operation parameters of machine are the main factors affecting the volume shrinkage rate.

中文摘要.....................................I
英文摘要.....................................II
表目錄......................................III
圖目錄......................................VIII
符號說明.....................................IX
第一章、緒論..................................1
1-1 前言.....................................1
1-2 文獻回顧..................................2
1-3 研究動機與目的.............................4
1-4 論文架構..................................5
第二章、氣體輔助射出成形.........................6
2-1 射出成形製程..............................6
2-2 射出成形理論..............................7
2-3 氣體輔助射出成形技術........................10
2-3-1 完全射出法..............................11
2-3-2 短射出法..................... ..........11
2-4 氣體輔助射出成形流程........ .... .... .... 11
2-5 氣體輔助射出成形技術優勢.....................12
2-6 射出設備..................................13
第三章、模型建構、實驗與分析......................18
3-1 研究目的..................................18
3-2 模流分析流程...............................20
3-2-1 模型圖繪製...............................20
3-2-2 表面網格................................23
3-2-3 實體網格................................21
3-2-4 材料選取................................22
3-2-5 成形條件參數控制..........................22
3-2-6 分析結果. . . . . . . . . . . . . . . . 22
3-3 分析模型說明...............................23
3-3-1 分析產品................................23
3-3-2 充填分析................................29
3-3-3 體積收縮率分析...........................29
3-4 氣體輔助射出成形模組........................30
3-4-1 充填分析結果.............................30
3-4-2 體積收縮率分析結果........................31
第四章、氣體輔助射出成形製程優化...................32
4-1 引言......................................32
4-2 田口方法...................................32
4-2-1 信號雜訊比(S/N)...........................33
4-2-2 變異數分析................................35
4-2-3 田口實驗規劃流程...........................36
4-3 應用田口實驗設計法進行製程優化..................37
4-3-1 品質特性的選定.............................37
4-3-2 影響品質特性因子...........................37
4-3-3 體積收縮控制因子與水準配置...................37
4-3-4 充填分析結果..............................39
4-3-5 體積收縮率分析結果.........................45
第五章、結果與討論...............................46
5-1 體積收縮率分析探討...........................46
5-2 充填分析探討................................49
5-3 氣體行為分析................................54
第六章、結論....................................55
未來研究方向....................................56
參考文獻.......................................57

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