結合STL三角網格與DXF公差資訊之電腦輔助檢測技術系統發展

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研究生：	吳宗諭 Zong-Yu Wu
論文名稱：	結合STL三角網格與DXF公差資訊之電腦輔助檢測技術系統發展 The study of Computer Aided Inspection about combining STL Triangular Mesh with tolerance of DXF information
指導教授：	賴景義 Jing-Yih Lai
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
畢業學年度：	94
語文別：	中文
論文頁數：	79
中文關鍵詞：	圖形交換文件、三角網格、電腦輔助檢測、座標定位
外文關鍵詞：	coordinate registration, STL, CAD aided inspection, DXF
相關次數：	點閱：11 下載：0
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品質檢測一直是產品生產過程中，不可缺少的部份，產品之檢測發展更需要隨著設計製造的腳步而進步。產品檢測雖然包含許多項目，但尺寸的檢測為最主要的項目。因此本研究目標在於結合CAD模型系統與DXF藍圖系統簡化自動化檢測之流程。
主要研究重心在於發展電腦輔助檢測之基本原理與演算法。研究內容包含如何有效率處理DXF格式資料結構，並簡潔說明由AutoCAD所制定DXF格式，特別提到圖形元素之尺寸標註說明，可以經由解析DXF藍圖格式，獲得尺寸與公差資訊。透過STL三角網格平行切層處理，可以得到CAD模型在二維平面截面點資料，經由座標轉換處理，將CAD模型與藍圖資料正確對應。電腦輔助檢測將CAD模型與藍圖資料結合在一起，針對藍圖檢測規劃項目自動化檢測，最後將CAD模型點資料根據設計藍圖尺寸公差規劃自動化公差分析。

Quality inspection has been an indispensable part in the production process all the time. The technique of inspection has to be improved in order to keep up with the development of manufacturing. In spite of many kinds of inspection that should be implemented in a product, the dimension inspection of the product is still the most important. For this reason, the objective of this study combines the CAD system and the DXF blueprint to simplify the steps of automatic inspection by using CAD system.
The main focus of this study is to develop the basic principle and algorithm used for computer aided inspection. The scope of this work includes how to efficiently handle the data structure of the DXF format. The DXF format of AutoCAD is briefly described. Especially, the dimension codes of entities section are noted. We can acquire the information of dimension and tolerance via understanding the information of the DXF file of the blueprint. By using direct parallel slicing of STL triangular meshes, we can obtain the CAD model of points group on 2-D cutting plane surface. Then, dealing with the coordinate transformation by registration, we can match the coordinate systems of the CAD model and the data points correctly. The computer aided quality inspection combines the designed blueprint and 2D CAD model to form an automatic inspection plan according to the items specified on the blueprint. Several examples are presented to demonstrate the entire process and to verify the feasibility of the proposed approach

第一章 緒論.............................1
1 前言	...............................1
2 文獻回顧............................2
3 研究目的與方法	......................5
4 論文架構............................7
第二章DXF檔案格式與標註基準判斷.........9
1 前言	...............................9
2 DXF格式組成.........................9
2.1 DXF組成...........................9
2.2 ENTITIES內容	......................11
3 DXF資料結構規劃.....................20
3.1 尺寸與公差資訊資料結構............20
3.2 尺寸與公差資訊讀取................21
4 DXF尺寸標註基準的判斷...............24
5 結果討論............................28
第三章 二維CAD模型點資料與藍圖定位處理..31
1 前言................................31
2 座標轉換............................31
3 粗定位處理..........................33
4 精定位處理..........................37
4.1 點群分區間........................37
4.2 線群分區間........................39
4.3 SVD座標轉換	......................41
4.4 精定位計算過程....................42
第四章 自動化檢測.......................44
1 前言................................44
2 檢測自動化與方法....................44
2.1 尺寸公差演算法....................44
2.2 自動化檢測方法....................48
3 軟體配置架構........................51
4 範例實作............................53
5 結果討論............................65
第五章 結論與未來展望...................66
1 結論................................66
2 未來展望............................67
參考文獻	...............................68

                                

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