标题: | 逆向工程中曲线与曲面的缀合运算 Curve and Surface Fitting in Reverse Engineering |
作者: | 杨志强 Jyh-Chung Yang 庄荣宏 Jung-Hong Chuang 资讯科学与工程研究所 |
关键字: | 逆向工程;曲线与曲面缀合;Reverse Engineering;Curve and Surface Fitting |
公开日期: | 1994 |
摘要: | 在电脑整合制造过程中,逆向工程以三次元座标量测仪,或雷射量测铸件外 形及轮廓,然后利用电脑做曲面的缀合,并以此作加工路径并产生 NC 程式 以控制工具机做加工。 因模具加工的复杂度增加及品质精度的要求日益 提升,曲线及曲面的缀合运算在整个逆向工程显的更重要。 曲线及曲面的 缀合运算基本上是寻求一连线的曲线及曲面, 或者合成曲线曲面,通过三 维中给定的一组点。逆向工程中这问题显得较复杂,因为点的数量很大,且 大都是不规则排列。本论文针对曲线在逆向工程的运用,提出可行的做法, 并且实作。而对曲面缀面缀合问题,除了探讨对文献上的做法外,我们也实 作其中一做法,另外我们也提出并实作一新的缀合方法。我们也根据逆向 工程的需求检讨这些方法的适用性。 In the field of computer integrated manufacturing, the reverse engineering is a process that reproduces a manufactured part based on the sampling points obtained from a coordinate- measurement machine or a laser scanning machine. In the process the shape of the part is approximated by fitting surface and from which a NC tool path is generated. The curve and surface fitting becomes complicated when applied to the reverse engineering since the sampling points are numerous and are usually scattered, and moreover, the fitting surface should be well suited for the NC path generation. In this paper, we propose a feasible method for the curve fitting in the reverse engineering. For the surface fitting, several existing methods are surveyed, one if which was implemented. A new approach is also proposed and implemented. These methods are examined according to the needs of the reverse engineering. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT830392030 http://hdl.handle.net/11536/58951 |
显示于类别: | Thesis |