研究生: |
陳青森 Thomas - Chen |
---|---|
論文名稱: |
自由曲面模具之冷卻水道設計研究 Investigation of Cooling Channel Design for Injection Mold with Free-Form Surface |
指導教授: |
林榮慶
Zone-Ching Lin |
口試委員: |
許覺良
Chaug-Liang Hsu 傅光華 Kuang-Hua Fuh 成維華 none 王國雄 Kuo-Shong, Wang |
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: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 170 |
中文關鍵詞: | 積層技術 、異形冷卻水道 、等效面積 、最佳化 、目標函數 、限制條件 、迭代方法 、水道佈置 、模流分析 、模擬 |
外文關鍵詞: | additive laminate technology, conformal cooling channel, equivalent plane area, optimzation, objective function, constrain, iteration, layout of cooling channel, moldflow, simulation |
相關次數: | 點閱:526 下載:0 |
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近年來積層技術的演進蔚為一股潮流,模具工業也導入3D雷射積層掃描應用於模仁製作,讓冷卻水道可以沿著曲面外型製作,大幅提升冷卻效率。
以往冷卻水道最佳化研究大都以平面樣本為探討對象,本研究創新的提出將彎曲曲面模具,用類似直線斷面的觀念,轉成等效平面面積,同時並計算曲面模具上的彎曲冷卻水道長度,然後用等效平面面積的觀念帶入模具的冷卻水道內的冷卻水與模具內高溫射出材料的熱平衡理論公式。並提出計算最少冷卻時間的彎曲曲面模具的冷卻水道佈置設計的最佳化計算方法。此最佳化計算方法的流程包括:目標函數、限制條件、理論公式、冷卻水道各線段的位置、冷卻水道直徑、水溫及流量,等效面積理論及迭代方法。
本文亦提出,公模及母模的冷卻水道佈置設計有不同的冷卻水道數量及佈置的方法,使模具內的射出材料的上下表面溫度收斂在設定範圍內。最後本文探討兩個自由曲面模具案例,依本研究所建立的自由曲面模具的冷卻水道最佳設計方法進行分析計算,並使用模流分析工具Moldflow做模擬及驗證,有效的在開模前找出最佳的冷卻水道設計。
In recent years, evolution of additive lamination technology has become a tendency. Mold industry is also added with 3D laser additive scanning process for application to mold core manufacturing, allowing cooling channel to carry out manufacturing while conforming with the surface, tremendously enhancing the cooling efficiency. In the past the studies of cooling channel optimization mostly took plane samples as the targets for investigation.
This study innovatively proposes making free-form surface area of a mold into an equivalent plane area. Employing a concept similar to straight-line section, each curved surface is turned to be an equivalent plane area. At the same time, the paper calculates the length of the bending cooling channel on each mold with curved surface. After that, equivalent plane area concept is brought to the equation of heat balance theory of the cooling water inside the cooling channel of mold and the material injected in the mold under high temperature. The paper also proposes an optimized calculation method that uses the least cooling time to design the layout of cooling channel of the mold with free-form surface.
The process of such an optimization calculation method include objective function, constraint, equation of theory, positions of different line segments of cooling channel, diameter of cooling channel, water temperature and flow amount, equivalent plane area and iteration method. The paper also suggests that the layout design of the cooling channel of core mold and cavity mold has different quantity of cooling channels and layout methods, making the upper and lower surface temperatures of the injected material inside the mold to be converged within the set range. Finally, the paper explores two cases of molds with free-form surface. According to the optimized design method of cooling channel of mold with free-form surface developed by the study, analytic calculation is made. The paper also adopts a mold flow analysis tool, Moldflow, to perform simulation and verification, thus effectively finding an optimized cooling channel design before the mold is made.
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