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題名 | 不同曲面模型在模具設計上之研究= |
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作者 | 張師敏; 王中行; |
期刊 | 大葉學報 |
出版日期 | 19941200 |
卷期 | 3:1 1994.12[民83.12] |
頁次 | 頁93-102 |
分類號 | 472.22 |
語文 | chi |
關鍵詞 | 雕刻曲面; 自由曲面; 非解析性圖素; Sculptured surfaces; Free-formed surfaces; Non-analytic entities; |
中文摘要 | 模具於造形設計時所遇最棘手問題是曲面的設計,尤其是不規則曲面,例如雕刻曲面或自由曲面,通常較不容易設計與製造;而國內模具業大部分是中小企業,缺乏足夠人力去研究發展曲面設計與製造方法,因此發展不規則曲面設計與製造方法,以提升模具業對模型設計及製造能力之水準,為產業升級重要課題。在模形設計方面,能以單一數學方程式表示的解析性圖素較為大家所熟悉,而對不能以單一數學方程式表示的非解析性圌素較為陌生,尤其是個人電腦級的設計軟體,較少提供非解析性圖素功能,因而發展自由曲面模型設計受到限制;故發展一套PC級自由曲面模型愈顯重要;本文即針對非解析性圖索的設計,採用多項式方法,在個人電腦上設計合成的Bezier、B-spline、NURBs曲線和曲面。本文在AutoCAD環境下,首先由AutoLISP語言建立自由曲線,後由所建立自由曲線配合,AutoCAD原有功能,進一步發展為曲面或實體,亦可由AutoLISP語言直接建立自由曲面,以提供模具設計上之應用使用。 |
英文摘要 | The most difficult thing in shape die design is to handle geometric surfaces, especially irregular surfaces such as: sculptured surfaces or free formed surfaces which are not easy to design and manufacture. Most domestic die manufacturers are small scales which lack of R&D in die design and manufacturing. So developing the irregular surfaces for die design and manufacturing to promote the industrial technology is the most important task. In engineering model design, analytic entities which can be expressed by a single mathematical formula are known very well. However, non-analytic entities which can not be expressed by a single mathematical formula are unfamiliar. Software in personal computer seldom supported non-analytic entities function, thus the development of free-formed surface models is limited. The utilization of non-analytic entities can be adopted by polynomial functions to produce synthetic Bezier, B-spline, NURBs curves and surfaces. How to develop a PC based free-formed surface model is important to us. This research is under AutoCAD working environments. First, free-formed curves are established by AutoLISP language. Then curves are extended into surface models or solid models. It also can be constructed directly by AutoLISP. The whole research can be implemented in die design models. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。