四邊形網格自動建構之多尺寸輪廓撒點技術研究

NCUIR > Engineering College > Graduate Institute of Mechanical Engineering > Electronic Thesis & Dissertation > Item 987654321/95818

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/95818

Title:	四邊形網格自動建構之多尺寸輪廓撒點技術研究
Authors:	王齊;Wang, Qi
Contributors:	機械工程學系
Keywords:	輪廓撒點;多尺寸撒點;四邊形網格;網格建構;模流分析;contour seeding;multi-size seeding;quadrilateral mesh;mesh generation;mold flow analysis
Date:	2024-07-09
Issue Date:	2024-10-09 17:18:29 (UTC+8)
Publisher:	國立中央大學
Abstract:	塑膠射出成型製程中，需要開發製造成本高昂的模具。目前為了降低模具的製造成本，通常會先進行模流分析，以模擬使用者的設計。透過此方式，可以確保設計符合產品的需求，然後再開始製造模具，從而達到節省成本的目標。模流分析是透過實體網格，模擬射出成型的過程與結果，因此設計階段的CAD模型，需要轉換成實體網格，才能夠執行模流分析。如果實體網格數量過多，模流分析的計算時間將會過長。實體網格是由表面網格轉換而成，而表面網格的建構過程中，需要先進行輪廓撒點，才能夠建構表面網格。表面網格建構中，第一層的網格大小，是依照輪廓撒點間距的尺寸，也會間接影響整個CAD模型的網格尺寸，因此輪廓撒點與網格尺寸相關。本研究開發多尺寸輪廓撒點方法，使得網格建構的尺寸能夠變化。具體來說，對於簡單的輪廓，使用大尺寸的網格；對於複雜微小的輪廓，則使用小尺寸的網格。這樣可以減少CAD模型的網格數量，從而縮短模流分析計算的時間。本研究的多尺寸撒點方法，特別適合應用於IC CAD的模流分析。經過多個範例測試，本研究的多尺寸撒點相較於傳統的單一尺寸撒點，能夠將模流分析時間減少50.40%至99.11%。故本研究的撒點技術，可顯著地改善模流分析的計算效率。;n plastic injection molding processes, developing molds can incur high manufacturing costs. To reduce these costs, mold flow analysis is typically conducted upfront to simulate user designs. This ensures designs meet product requirements before mold production begins, achieving cost savings goals. Mold flow analysis simulates the injection molding process and its outcomes using physical meshes. Therefore, CAD models at the design stage need to be converted into physical meshes for this analysis. Excessive mesh complexity can lead to prolonged computation times during mold flow analysis. Surface meshes are derived from contour seedings during their construction process. The size of the initial mesh layer is dictated by the spacing of these contour seedings, indirectly affecting the overall CAD model mesh size. This research introduces a multi-size contour seeding method to vary mesh construction dimensions. Specifically, larger meshes are used for simpler contours, while smaller meshes are applied to intricate, small-scale contours. This approach reduces the number of CAD model meshes, thereby shortening mold flow analysis computation times. Particularly suited for IC CAD mold flow analysis, this multi-size seeding method significantly outperforms traditional single-size seeding, reducing analysis times by 50.40% to 99.11% across multiple test cases. Hence, this seeding technique markedly enhances the computational efficiency of mold flow analysis.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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