研究生: |
洪慧倫 Hui-Lun Hung |
---|---|
論文名稱: |
澆口設計於微溝槽平板射出成形複製性研究 Research on Gate Design of Injection Molding for Replication of Flat Plates with Micro Grooves |
指導教授: |
陳炤彰
Chao-Chang A. Chen |
口試委員: |
楊申語
Sen-Yeu Yang 鄭逸琳 Yih-Lin Cheng |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 168 |
中文關鍵詞: | 澆口壓力損失函數 、澆口設計 、微結構 、射出成形 、導光板 |
外文關鍵詞: | Gate pressure loss function, Gate, Micro features, Injection molding, Light guide plate |
相關次數: | 點閱:320 下載:3 |
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澆口是塑膠射出成形模具上很重要的一個設計,直接影響了射出成品的品質,其設計主要是為了調節熔膠流速、流量及方向來獲得好的產品品質。以澆口的位置、形狀與尺寸之設計使模穴內有最佳的流動及最小的壓力損失,依此可得到好的充填性及最小的翹曲。本研究利用電腦模流軟體Moldex3D R9.1模擬在充填時壓力損失、保壓結束時間點的壓力、以及翹曲變形量作為澆口設計的判斷依據,並分析不同澆口設計之澆口壓力損失函數(Gate pressure loss function, GPLF) δP及對翹曲之影響,另外探討澆口設計的寬度比Gw與高度比Gh對於平板射出成形之微溝槽成形率與成品平面度的品質修正,最後進行澆口修改製作及射出成形實驗驗證。研究結果顯示澆口尺寸為成品寬度30 %與高度70%的時候,可有效改善原來成品品質,使微溝槽成形率在近澆口端從77.04%增加至81.68%、成品末端從76.67%增加至78.88%,平均平面度從0.083 mm降低為0.060 mm,並發現澆口的高度設計對於其微溝槽的成形率及平面度複製性的影響較寬度大。本研究結果可應用於不同成品之澆口設計,以降低開發時間及提高成品品質,未來可依此澆口設計應用於含微結構之導光板射出壓縮成形或變模溫射出成形探討。
Gate design is one of the most important functional structures in an injection mold, as it has a direct influence on the quality of the injected products. The gate is usually designed to regulate and control the flow direction achieves for better qualities of products. The gate location, shape and dimensions can also be considered to achieve the optimal flow and low pressure loss into the mold cavity for obtaining filling rate and the minimal warpage. This research utilizes a computer-assisted engineering software – Moldex3D R9.1 to analyze the pressure loss of filling process, packing pressure and warpage. This research aims to investigate the quality improvement of the replication of micro grooves and macro flatness in injection molding of flat plates for different gate design. A gate pressure loss function δP has been developed for gate design of flat plates with micro grooves. Experimental results show that the qualities of products can be improved while the size of gate design is 30% in width and 70% in height of part. The transfer ratio of groove (TRG) increases from 77.04% to 81.68% and the average of Non-uniformity (NU) decreases from 0.083 mm to 0.060 mm. Moreover, the results also demonstrate that the height of gate is more significant than the width of gate for replication. This research can be potentially applied to gate design of the vario-thermal molding or injection compress molding of light guide plate with micro structures in the future.
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