臺灣博碩士論文加值系統

本研究主要是應用Visual Basic 6.0開發一套電腦輔助設計(Computer Aided Design；CAD)軟體之快速原型（Rapid Prototyping；RP）直接適應性切層技術，運算法則是利用曲面資料在Z軸方向餘弦所計算的切層厚度。本研究主要目的是克服目前快速成型機，所使用之STL檔案格式之資料重複記錄與精度誤差等問題。
在本研究中所開發之適應性直接切層技術所應用之軟體為，英國Delcam公司的所發展的CAD/CAM軟體統稱，為Power Solution，其中的CAD模組為Power SHAPE，此軟體模組功能相當齊全，因此極適合利用來發展適應性切層及直接切層軟體。而在Power SHAPE的切層介面開發有三種方式；（1）應用巨集功能內的記錄功能，此功能可以將所使用過的指令記錄下來，但缺點在於無法應用於不同的CAD模型上；（2）編輯巨集指令檔(Macro Files)，比巨集功能更見彈性，可應用於不同模型上，但缺點為沒有一個友善的介面；（3）應用Visual Basic開發CAD切層介面，此方法改善了上述兩項的缺點，應用Visual Basic不但可以自行開發友善的介面，並且可以應用Visual Basic運算的功能在不同的模型上。
本研究所發展的程式介面弁鄍D要著眼於適應性切層法和直接切層法(Adaptive Slicing)。功能包括取得模型資料並進行預切、精度設定、最厚成型高度參數及切層輪廓運算等。最後本研究亦利用ㄧ個內含於PowerSHAPE之範例模型進行操作示範，並與非適應性之直接切層結果進行比對。由比較結果可得知在減少切層數或是提高精度的表現上適應性切層的確有較佳的表現。

The major objective of the research is to develop the software that can make direct adaptive slicing on a 3D surface model. Because cos-1(z) is used to calculate the slicing thickness with the surface model, the shortcoming of the STL data format is then overcome and the actual model from the Rapid Prototyping Process would be more accurate.
During the development, Microsoft Visual Basic 6.0 and Delcam PowerShape are utilized to fulfill the task. Although PowerShape is a very strong 3D modeling software especially with its Macro functions, the user interface however is not as user-friendly as we want. Therefore, Microsoft VB is here taking to role of bridging. Moreover, the computation capability of MS VB is also utilized to make necessary calculations.
The completed computer user interface, developed from this project, includes import data file; pre-slicing; setting of precision; setting of maximum height parameter; slicing contour calculation; and options of adaptive Slicing or Direct Slicing. This slicing technology not only allows the user to analyze any particular surface on the 3D model, it also allows the user to specify his necessary accuracy.

中文摘要--------i
英文摘要---------- ii
誌謝--------iii
目錄--------iv
圖目錄--------vi
符號說明--------viii
一、 緒論--------1
1.1 簡介--------1
1.2 文獻回顧--------3
1.2.1 快速成型技術--------3
1.2.2 快速成型原理--------3
1.2.3 STL格式介紹與改善方法--------5
1.2.4 適應性切層--------7
1.3 論文研究方向與重點--------8
1.4 本文架構--------9
二、 快速成型系統--------11
2.1 快速成型種類機型介紹---------11
2.2 快速成型製作原理--------19
2.3 快速成型檔案格式--------20
2.3.1 STL檔案格式--------20
2.3.2 STL格式之優點--------21
2.3.3 STL格式之缺點--------21
2.3.4 其他轉換格式--------26
2.4 產生成型資料上所存在的缺陷--------29
2.5 結論--------30
三、 適應性直接切層軟體開發--------31
3.1 直接切層與適應性切層原理--------33
3.1.1 直接切層原理--------33
3.1.2 適應性切層原理--------36
3.2 應用VB開發PowerSHAPE切層指令--------37
3.3 開發適應性切層--------39
3.4 前處理--------42
3.5 切層厚度計算--------45
3.6 切層厚度計算--------50
3.7 切層--------52
3.8 結論--------53
四、 軟體執行示範--------54
4.1 模型開啟與定位--------55
4.2 模型前處理--------57
4.3 模型厚度運算和切層過程--------59
4.4 參數設定比較--------62
4.5 結果與討論--------64
五、 結論與未來發展方向--------68
5.1 結論--------68
5.2 未來發展方向--------69
參考文獻--------71
自述--------75

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