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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/85155


    Title: 精密閥件射出成形製程開發-CAE模擬與開模驗證
    Authors: 張學忠;CHANG, HSUEH-CHUNG
    Contributors: 機械工程學系在職專班
    Keywords: 射出成型;Moldex3d;Weight Stability
    Date: 2020-12-03
    Issue Date: 2021-03-18 18:21:50 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文實驗中透過Moldex3D 進行精密閥件模具的開模驗證,以Moldex3d分析結果射出充填時間、保壓時間、射出壓力、保壓壓力、及澆口貢獻度等等,分析探討精密閥件模具在射出製程中是否會有因模具問題點而影響到實際生產產品的品質,並在分析結果中提前得知參數調整之方向,並將透過短射模擬結果,與實際短射的結果進行驗證,模擬與實際射出間兩者的差異性,經過實際驗證後可知模具流道及澆口之設計可達到平衡的狀態,代表模具流道及澆口的設計應用是可行的。
    而依照精密閥件特性,射出製程開發將在製程中進行產品穩定性的探討,而在產品穩定性中又可被區分為尺寸精度的穩定性及產品重量的穩定性兩種,而在本實驗中將會以產品重量的穩定性進行探討。
    透過實驗利用射出成型參數因子(螺桿轉速、背壓壓力、模具溫度)進行射出成型產品重量穩定性的實驗,透過實驗的驗證可得知當螺桿轉速越快時,其產品重量將會越輕。而當螺桿背壓壓力設定越大時,其產品重量將會越重,但當背壓大到一定壓力時其產品重量開始變輕。最後透過模具溫度的改變,由模具溫度40℃開始變化到90℃可得知在模溫40℃較低的時候產品重量越重,當模溫升高到90℃時重量即變輕,因此可得知模具溫度越高其產品收縮率越大故導致重量變輕。
    最後藉由Moldex3D模流分析及實際實驗之間的互相搭配下,可縮短後續產品開發時間,並減少修模次數,降低失敗成本,可大大提升產品的開發效益。
    ;In the experiment of this thesis, Moldex3D is used to verify the mold opening of the precision valve mold, and the Moldex3d analysis results are used to inject the filling time, holding time, injection pressure, holding pressure, and gate contribution, etc., to analyze and discuss the precision valve mold. In the injection process, will there be any mold problems that will affect the quality of the actual product, and the direction of parameter adjustment will be known in advance in the analysis results, and the short shot simulation results will be verified with the actual short shot results. The difference between the numerical simulation and the actual injection, after actual verification, it can be known that the design of the mold runner and gate can reach a balanced state, which means that the design and application of the mold runner and gate is feasible.
    According to the characteristics of precision valve parts, the development of injection process will be discussed via product stability in the process, and product stability can be divided into dimensional accuracy stability and product weight stability. The stability of product weight will be discussed experimentally.
    Through experiments, the injection molding parameter factors (screw speed, back pressure, mold temperature) are used to test the weight stability of injection molded products. The experimental verification shows that the faster the screw speed, the lighter the product weight will be. When the screw back pressure is set higher, the product weight will be heavier, but when the back pressure reaches a certain pressure, the product weight will start to become lighter. Finally, through the change of the mold temperature, from the mold dwell temperature of 40°C to 90°C, it can be seen that the weight of the product becomes heavier when the mold temperature is lower than 40°C, and the weight becomes lighter when the mold temperature rises to 90°C, so It can be seen that the higher the mold temperature, the greater the shrinkage of the product, which results in lighter weight.
    Finally, the combination of Moldex3D mold flow analysis and actual experiments can shorten the follow-up product development time, reduce the number of mold repairs, reduce failure costs, and greatly improve product development benefits.
    Appears in Collections:[機械工程學系碩士在職專班 ] 博碩士論文

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