臺灣博碩士論文加值系統

本研究透過改變D型潛伏式澆口角度獲得較佳的去澆效果，從而減少去澆殘留。希望在相同頂出力量下減少受力面積，從而增加去澆應力；首先以拉伸試驗判斷其塑膠材料偏向脆性的材料，故在理論計算公式是使用脆性材料的應力計算公式進行去澆應力之計算，經計算澆口角度轉置可獲得較大的去澆應力；再利用ANSYS Workbench電腦輔助工程軟體計算其去澆時所產生的應力，在此可知道轉置角度越大其最大應力越大，而楔型角越大其最大主應力越小；再亦針對疲勞壽命時可發現轉置角度對於其壽命影響較小；在分析驗證中利用Autodesk Moldflow進行充填保壓的分析，結果證明轉置角度在60度時其充填壓力比其他角度還小，並且其後續的包風影響亦較小；綜合以上在最後的實驗開模驗證時使用轉置角度為60度的D型潛伏式澆口與0度的進行比對。
最後藉由實驗驗證，在定數取樣可以觀察到在第1,000模次時，0度的D型潛伏式澆口即發生澆口殘留的問題；於60度的澆口情況在3,500模次結束前均情況良好。而在隨機取樣中，0度的澆口有超過50%有澆口殘留的問題，其中超出0.05mm規格者有32%，反觀60度則只有12%；經由實驗證明轉置後的D型潛伏式澆口具有比傳統澆口有更好的去澆性能，能有效的減少澆口在去澆後殘留的問題。

This study changed D-type submarine gate angles to achieve superior degating results and produce less degating residue. The goal was to decrease the force-bearing area given an identical ejector force, thereby increasing the degating stress. A tensile test was performed to identify brittle plastic materials, in which degating stress was calculated using the theoretical formulas typically used for calculating brittle material’s stress. According to the calculations, flipping the gate angles created higher degating stress. Subsequently, a computer-assisted engineering software called ANSYS Workbench was utilized to calculate stress created during degating. The results revealed that the higher the flip angle was, the greater the stress became, and that the higher the wedge angle was, the lower the maximum principal stress became. Next, a fatigue life test was conducted; the results indicated that flip angle exhibited a minimal effect on fatigue life. Then, Autodesk Moldflow was used to perform filling and packing analyses, where the results showed that the least filling stress was achieved at a flip angle of 60°; such flip angle also produced a relatively small air trap effect. On the basis of these findings, the D-type submarine gate with a flip angle of 60° was compared with the D-type submarine gate with a flip angle of 0° during an open-die verification experiment.
The verification experiment showed that when the fixed number sampling method was adopted, gate residue was observed in the 1000th mode of the D-type submarine gate with a flip angle of 0°, whereas no gate residue was observed by the 3500th mode of the D-type submarine gate with a flip angle of 60°. When the random sampling method was adopted, more than 50% of D-type submarine gates with a flip angle of 0° had gate residue (note that 32% of them exceeded the requirement of 0.05 mm), whereas only 12% of D-type submarine gates with a flip angle of 60° had gate residue. These results confirm that flipped D-type submarine gates demonstrate superior degating performance than traditional D-type submarine gates do, and that they can effectively reduce degating residue.

摘 要 I
ABSTRACT II
誌 謝 IV
目 錄 V
表目錄 VII
圖目錄 IX
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 文獻回顧 3
1.4 論文架構 10
第二章 文獻探討 11
2.1 流道系統 11
2.1.1 主流道 12
2.1.2 分流道 13
2.1.3 澆口 16
2.2 破壞力學 21
2.2.1 恆力破壞 26
2.2.1.1 脆性破壞 27
2.2.1.2 延性破壞 29
2.2.1.3 高分子材料破壞行為 31
2.2.2 疲勞破壞 34
2.2.2.1 疲勞壽命 36
第三章 研究方法 38
3.1 研究流程 38
3.2 實驗過程 40
3.2.1 拉伸試驗 40
3.2.2 研究假設 44
3.2.3 設計變更 47
3.2.4 去澆能力CAE分析 61
3.2.5 疲勞壽命評估 66
3.2.6 模流分析 68
第四章 結果與討論 71
4.1 去澆能力分析評估 71
4.2 疲勞壽命分析評估 80
4.3 模流分析結果評估 85
4.4 實際驗證 89
第五章 結論與未來展望 101
5.1 結論 101
5.2 未來展望 103
參考文獻 104
附錄A Futaba標準模座 108
附錄B 隨機取樣澆口外觀 109

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