臺灣博碩士論文加值系統

中文摘要
本研究旨在規劃出無過切的直線式及參數式精加工刀具路徑，其刀具路徑規劃的基本構想是藉由在offset surface上作刀具路徑規劃，以減少過切現象的發生。在直線式刀具路徑規劃方面，先建立驅動平面，次之與offset surface作布林運算以擷取交線資訊，再以chord length及cusp height 分別來求得無過切的CL-point及相鄰兩刀具間距值，最後連結所有的CL-point產生精加工刀具路徑。在參數式刀具徑規劃方面，其步驟大多跟直線式刀具路徑規劃相同，唯一不相同的地方是直接在參數曲面上擷取參數曲線。在本研究裡應用了ACIS - geometric kernel及Microsoft Foundation Classes來協助精加工演算法的開發以及人機介面系統的建造，以順利產生視窗化的精加工刀具路徑規劃系統。

ABSTRACT
This research attempts to automate the planning of gouge-free linear and parametric cutter paths for finish machining of sculptured-surfaces. Its basic concept is to generate the cutter-location (CL) data directly from the “offset surface”. The planning of linear cutter-paths starts with creating various drive planes to intersect with the offset surface in order to obtain the cutting curves. Chord length and cusp height are then considered to find step interval and CL-data which do not cause any gouging during the finishing operations. As for the planning of parametric cutter-paths, procedure similar to linear path is applied, except that the cutting curves are found directly from the u- and v-parameters of the offset surface. ACIS geometric kernel is used in this study as the source of providing the 3D geometry for the surface to be machined. MFC programming interface is employed as the system development tool to verify the proposed idea and algorithms.

目錄
中文摘要
英文摘要
誌謝
目錄
圖表索引
第一章 緒論
第二章 系統之開發工具
2.1 簡介ACIS-Geometric Kernel
2.2 簡介MFC
第三章 產生直線式及參數式精加工刀具路徑
3.1 精切演算法的基本理論
3.1-1 NURBS的理論基礎
3.1-2 決定精加工路徑的參數
3.2 精加工的演算流程
3.3 建立偏置曲面
3.4 產生直線式刀具路徑
3.4-1產生切平面並擷取偏置曲面上的交線
3.4-2以步進長度判斷切削點
3.4-3 以尖端高度判斷下一條加工路徑
3.4-4 插補路徑
3.4-5 合併切削路徑
3.5 產生參數式刀具路徑
3.5-1 擷取等參數曲線
第四章 系統驗証
4.1實例1
4.2實例2第五章結論
附錄一
附錄一
參考文獻
作者簡介

參考文獻
1. B. K. Choi, C.S. Jun, “Ball-end cutter interference avoidance in NC machining of sculptured surface”, Computer Aided Design, Vol. 21,No.6, 1989, pp.371-378.
2. B. K. Choi, C.S. Lee, J.S. Hwang and C. S. Jun, “Compound surface modeling and machining”, Computer Aided Design, Vol.20, No. 3,1988,pp. 127-136.
3. Ding Qiulin, B.J. Davies, “Surface Engineering Geometry for computer-aided design and manufacture” Ellis Horwood Limited, pp.251-252.
4. J. E. Bobrow, “NC machine tool path generation from CSG part representation”, Computer Aided Design, Vol.17 No.2, 1985, pp.69-76.
5. J. S. Hwang, “Interference-free tool-path generation in the NC machining of parametric compound surface”, Computer Aided Design, Vol.24, No.12, 1992, pp.667-676.
6. Jiing-Yih Lai, Der-Jong Wang, “Automatic Generation of NC Cutting Path for Sculptured Surfaces”, Journal of Chinese Society of Mechanical Engineers, Vol.15, No.6, 1994, pp.551-562
7. G. C. Loney, T. M. Ozsoy, “NC machining of free form surfaces”, Computer Aided Design, Vol.19, No.2, 1987, 85-59.
8. Kai Tang, Charles C Cheng, Yakove Dayan, “Offsetting surface boundaries and 3-axis gouge-free surface machining”, Computer Aided Design, Vol.27, No.12, 1995, 915-927.
9. Schoenberg I. J., “Contributions to the Problem of Approximation of Equidistant Data by Analytic Functions”, Q. Appl. Math, Vol. 4, 1946 45-99, 112-141.
10. Cox M. G., “The Numerical Evaluation of B-Splines”, National Physical Laboratory DNAC 4, 1971.
11. de Boor Carl, “On Calculation with B-Splines”, J. Approx. Theory, Vol.6, 50-62, 1972.