博碩士論文 106323061 詳細資訊




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姓名 蕭安勝(An-Sheng Hsiao)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 塑膠射出薄殼件之CAD模型凸起面特徵辨識與分模應用技術發展
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摘要(中) 在有限元素分析中實體網格直接影響其準確度與分析時間,而手動建立實體網格是目前相當耗時的技術之一。塑膠薄殼元件是射出成型當中常見的模型,薄殼元件中包含許多凸起物,凸起物又可以再細分成肋、管、柱以及其他較為複雜支撐結構等,若使用四面體網格自動建立網格,這些特徵容易造成品質下降的問題,因此若能事先將凸起物辨識出來,個別進行網格建立,則可以改善網格品質。在傳統模具設計當中,分模線、模仁設計往往依賴經驗豐富的工程師設計,造成設計上較為耗時且困難。在實務上模具溫度將影響到產品生成的品質,如果模溫不均會造成產品翹曲、縫合線、凹痕和短射等問題。因此本研究發展自動特徵辨識的技術,針對薄殼元件自動辨識凸起特徵,辨識過程中紀錄凸起物之關聯性,作為後續網格建立以及設計變更上的參考資訊。本研究的內外面辨識也進一步應用於分模線辨識上,可找出分模線、母模面、公模面,以改善傳統分模上設計困難與耗時的問題。
摘要(英) Solid meshes affect the accuracy and efficiency of the analysis and simulation. However, Solid mesh generation is usually a time-consuming process. Thin-wall plastic parts exist in many products and are frequently manufactured by injection molding. The inner surface of a thin-wall part involves many functional and structural features design, such as ribs, tubes and complex supporting structure. If we use tetrahedron meshes to generate these features, it usually results in poor quality mesh. The purpose of this study was to develop a method for the detection of protrusion features on thin-wall plastic parts. In the proposed algorithm, the inner and outer faces of a part model were recognized first, then auxiliary faces, including transitional, wall and bottom faces, were next recognized. In designing a model, the generation of the parting line is one of the most time consuming processes. The model designer may find it difficult to determine the parting line and parting surface. The purpose of this study was to recognize parting line, core surfaces and cavity surfaces.
關鍵字(中) ★ 塑膠薄殼元件
★ 內外面
★ 凸起物
★ 特徵辨識
★ 分模線
關鍵字(英) ★ Protrusion recognition
★ Feature recognition
★ Recognition of Inner and Outer Faces
★ Thin-Wall Part
★ Parting line
論文目次 摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 X
第一章 緒論 1
1.1前言 1
1.2 文獻回顧 3
1.3 研究目的與方法 6
1.3.1 研究目的 6
1.3.2 研究方法 7
1.4 論文架構 12
第二章 凸起面辨識之基礎 13
2.1 前言 13
2.2 特徵辨識前處理功能與資料 13
2.2.1 B-rep資料介紹 13
2.2.2邊與面的拓樸資訊 14
2.2.3特徵辨識前處理資料 18
2.3凸起面之基礎 21
2.3.1薄殼元件內外面定義 25
2.3.2薄殼元件輔助面 27
第三章 薄殼元件之內外面辨識 30
3.1前言 30
3.2內外面辨識演算法 30
3.2.1 建立開口方向與邊界框 32
3.2.2初步的面區分 32
3.2.3外側牆面計算與分群 35
3.2.4分界線計算 37
3.2.5內部面計算 39
3.3辨識結果與分析 39
第四章 薄殼元件之輔助面辨識 47
4.1前言 47
4.2輔助面辨識演算法 47
4.2.1交界面的計算 49
4.2.2牆面的計算 49
4.2.3底面的計算 51
4.2.4階梯牆面的計算 51
4.2.5 納入零星底面 53
4.3輔助面辨識結果與分析 56
第五章薄殼件辨識應用 63
5.1分模線辨識 63
5.1.1內外面與公母模可見性的概念 63
5.1.2分模線辨識 66
5.1.3辨識結果分析 69
5.2凸起面辨識 76
5.2.1凸起面共面問題 76
第六章結論與未來展望 80
6.1結論 80
6.2未來展望 82
參考文獻 83
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[13]吳闓任,以B-rep為基礎之薄殼元件凸起特徵辨識技術發展,國立中央大學碩士論文,2017年。
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[15]Rhinoceros, Available from: https://www.rhino3d.com/, Accessed on 05-Jul-2017.
[16] openNURBS, Available from:
https://wiki.mcneel.com/developer/opennurbs/home, Accessed on 05-Jul-2017.
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指導教授 賴景義(Jiing-Yih Lai) 審核日期 2019-6-12
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