臺灣博碩士論文加值系統

本研究運用偏置曲面之參數法，來規劃六軸工具機的刀具路徑，其基本想法是，直接在偏置曲面上作刀具路徑規劃，以期減少過切現象的發生。其次，為了減少刀具路徑資料量(CL file)，吾人以最佳化之黃金切割法，經由切削誤差的計算，插補最佳的刀具切削點。
同時，為了正確地產生六軸工具機的NC碼，將曲面的刀具點資料，透過以機器人學反運動學所建立之後處理器，產生曲面加工之數控程式。在本研究中以ACIS-geometric kernel及Visual C++來發展整個系統。

In this thesis, a tool path planning of a table-type six-axis machine tool has been developed. ACIS geometric kernel is used as the source of providing the 3D geometry for the model to be machined. The tool paths of the six-axis machine tool is generated by an offset surface. An optimization algorithm is used to reduce the size of CL data. The NC file for this six-axis machine tool can be obtained by a post-processer. Several examples have been demonstrated to illustrate this approach.

摘 要I
ABSTRACTII
誌 謝III
圖 索 引VI
表 索 引IX
第一章 緒 論1
1.1 研究動機與目的1
1.2 文獻回顧2
1.3 本文架構7
第二章 系統開發工具8
1.1 簡介ACIS 3D Toolkit8
1.2 參數曲面簡介16
1.3 參數曲面之特性17
1.3.1 B-spline曲面17
1.3.2 NURBS曲面19
第三章 路徑規劃21
3.1 路徑規劃21
3.2 干涉問題23
3.3 偏置曲面參數式刀具路徑24
3.4 誤差分析25
3.4.1 扇形高度誤差25
3.4.2 弦高誤差27
3.5 最佳化方法簡介29
3.6 黃金切割法原理31
3.7 黃金切割法求極小值的迭代計算過程34
3.8 切削點插補最佳化之設計流程35
3.9 產生參數式刀具路徑38
第四章 數值控制40
4.1 座標軸的定義40
4.2 座標轉換矩陣的建立42
4.3 後處理程式設計46
4.4 產生NC原理47
4.5 非法線方向切削56
4.6 反向速度與加速度分析58
4.7 奇異構型分析60
4.8 進給率62
4.9 產生NC碼63
第五章 電腦模擬與結果驗證66
5.1 程式執行結果66
第六章 結論與未來展望79
6.1 結論79
6.2 未來展望80
參考文獻81
作者簡介84

[1]陳政雄，“並聯式機構工具機”，機械月刊88年3月號。
[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, pp.127-136, 1988.
[3]A. Seiler, V. Balendran and K. Sivayoganathan, “Tool Interference Detection and Avoidance Based on Offset Nets”, Internation Journal of Machine Tools & Manufacture, Vol. 37, No. 5, pp.717-722, 1997.
[4]Chris McMahon and Jimmie Browne, “CAD/CAM From Principles to Practice”, Addison-Wesley,1993.
[5]P. Broomhead and M. Edkins, “Generating NC Data at the Machine Tool for the Manufacture of Free-Form Surfaces”, International Journal of Production Research, Vol. 24, No. 1, pp.1-14, 1986.
[6]G. C. Loney and T. M. Ozsoy, “NC Machining of Free Form Surface”, Computer-Aided Design, Vol 19, No. 2, pp.85-90, 1987.
[7]G. E. Yang and Y. S. Kong, “Study on the 3-Dimensional NC Machining of the Nonuniform B-Spline Composite Surface”, ASME Concurrent-Engineering, PED-Vol. 59, pp.115-126, 1992.
[8]K. I. Kim, “A New Machine Strategy for Sculptured Surfaces Using Offset Surface”, International Journal of Production Research, Vol. 33, No. 6, pp.1683-1697, 1995.
[9]K. Suresh and D. C. H. Yang, “Constant Scallop-height Machining of Free-Form Surfaces”, Journal of Engineering for Industry, Vol. 116, pp.253-259, 1994.
[10]Rong-Shine Lin and Y. Koren, “Efficient Tool-Path Planning for Machining Free-Form Surfaces”, Journal of Engineering for Industry, Vol. 118, pp.20-28, 1996.
[11]Jami J. Shah, “PARAMETRIC AND FEATURE-BASED CAD/CAM”, WILEY-INTERSCIENCE, (1995).
[12]Mikell P. Groover, “CAD/CAM COMPUTER-AIDED DESIGN AND MANUFACTURING”, PRENTICE-HALL, (1984).
[13]游金湖，“CAD/CAM的基本原理(I)”，建宏出版社，民國79年。
[14]FAUX & PRATT, “Computational Geometry for Design and Manufacture”, ELLIS HORWOOD, (1979).
[15]B. K. Choi and C. S. Jun, “Ball-End Cutter Interference Avoidance in NC Machining of Sculptured Surfaces”, Vol. 21, No. 6, pp.371-378, 1989.
[16]Y. J. Chen and B. Ravani, “Offset Surface Generation and Contouring in Computer-Aided Design”, Vol. 109, No. 1, pp.133-142, 1987.
[17]廖茂成，“自由曲面側銑最佳刀具路徑規劃之研究”，國立台灣科技大學碩士論文，民國88年。
[18]J.J.CRAIG, “ROBTICS”, Addison-Wesley, (1989).
[19]劉育嘉，“虛軸工具機系統之數值控制程式設計研究”，國立成功大學碩士論文，民國87年。
[20]蔡尚憲，“Hexaglide 並聯式平台機構之反運動學及工作空間分析與設計”，國立台灣科技大學碩士論文，民國89年。
[21]Chih-Ching Lo, “A New Approach to CNC Tool Path Generation”, Computer-Aided Design, Vol. 30, No. 8, pp. 649-655, 1998.