跳到主要內容

簡易檢索 / 詳目顯示

研究生: 陳長隆
Chang-Long Cheng
論文名稱: 多軸 CNC 切削誤差估算與後處理刀徑修正
指導教授: 黃衍任
Yean-Ren Hwang
口試委員:
學位類別: 碩士
Master
系所名稱: 工學院 - 機械工程學系
Department of Mechanical Engineering
畢業學年度: 89
語文別: 中文
論文頁數: 69
中文關鍵詞: 五軸CNC加工參數刀具路徑修正步進長度後處理
相關次數: 點閱:8下載:0
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報

  • 文中,我們試著藉由考量加工機形態與引入與加工機個體性的加工參數以減少傳統的刀具路徑規劃的誤差。在建立路徑軌跡與切削誤差時,加工機實際上會造成相當程度的影響,尤其是對於多軸加工機而言。刀具路徑產生的時候如果不考量加工機形態與加工機個體性的加工參數,往往會由於刀軸或是工件的迴轉造成額外的誤差,使得加工成果無法達到精度上的要求。在我們藉由Hermite曲線建立一個近似原始CAD模型的模型,重新考量最大切削誤差,對於步進長度加以重新決定之後,修正並改善了原始的NC加工碼,使得加工的精度和效率上都有所提昇。而透過模擬與實驗分析亦都得到了一些初步的結果,也對於我們所提出的看法有著正面的回應。


    第一章緒論 ………………………………………………………………1 1.1前言 ………………………………………………………………………1 1.2研究動機與目的 …………………………………………………………2 1.3文獻回顧 …………………………………………………………………4 1.4論文架構 …………………………………………………………………6 第二章切削誤差分析 ……………………………………………………8 2.1三軸加工切削誤差分析 …………………………………………………8 2.2座標轉換與刀具座標定義 ………………………………………………9 2.3主軸傾斜式多軸加工切削誤差分析 …………………………………11 2.3.1主軸傾斜式切削步進長度分析 …………………………12 2.3.2誤差估算公式小角度簡化 ………………………………15 2.3.3僅有前置角度變化之誤差簡化 …………………………16 2.4工件傾斜式多軸加工切削誤差分析 …………………………………18 2.3.1工件對機械座標系統之向量關係 ………………………20 2.3.2工件傾斜式切削步進長度分析 …………………………21 2.3.3誤差估算公式簡化 ………………………………………23 第三章後處理刀具路徑補插法 ………………………………………28 3.1模型建立 ………………………………………………………………30 3.1.1近似CAD模型建立 ……………………………………………………30 3.1.2近似Hermite曲線找尋與切削誤差之估算 …………………………32 3.2切削刀具路徑內插與平滑化 …………………………………………35 3.2.1切削誤差計算與補插點判斷 ……………………………36 3.2.2補插點數目計算 …………………………………………36 3.2.3曲線補插方法 ……………………………………………39 3.3刀具路徑改善 …………………………………………………………40 第四章演算法理論模擬與實際驗證 …………………………………42 4.1主軸傾斜式系統理論模擬測試之一 …………………………………42 4.2主軸傾斜式系統理論模擬測試之二 …………………………………49 4.3工件傾斜式系統理論模擬與實際切削測試 …………………………54 4.3.1工件傾斜式系統理論模擬 ………………………………54 4.3.2工件傾斜式系統實際切削測試 …………………………59 第五章結論與未來展望 ………………………………………………63

    1.Choi, B.K., Lee, C.S., Hwang, J.S., and Jun, C.S., "Compound Surface Modeling and Machining", Computer-Aided Design, vol. 20, no. 3, pp127-136, 1988
    2.Cho, H.D., et. al., "Five-axis CNC milling for effective machining of sculptured surfaces.", International Journal of Production Research, Nov. 1993, vol.31,(no.11):2559-73.
    3.Susan X. Li and Robert G. Jerard, ř-axis machining of sculptured surfaces with a flat-end cutter", Computer-Aided Design, Volume26, Number 3, March 1994
    4.Jianxin Pi, Edward Red, Greg Jensen, ” Grind-free tool path generation for five-axis surface machining”, Computer Integrated Manufacturing Systems, Volume: 11, Issue: 4,pp. 337-350, October, 1998
    5.Lee, Yuan-Shin, “Non-isoparametric tool path planning by machining strip evaluation for 5-axis sculptured surface machining”, Computer-Aided Design, Volume: 30, Issue: 7, pp. 559-570, June, 1998
    6.K. Suresh and D.C.H. Yang, “Constant Scallop-height Machining of Free-form Surfaces”, ASME Journal of Engineering for Industry, Vol. 116, pp.253-259, May 1994.
    7.Rong-Shine Lin and Y. Koren, “Efficient Tool-path Planning for Machining Free-form Surfaces”, ASME Journal of Engineering for Industry, Vol. 118, pp.20-28, February 1996.
    8.R. Sarma and D. Dutta, “The Geometry and Generation of NC Tool Paths”, ASME Journal of Mechanical Design, Vol.119, pp.253-258, June 1997.
    9.Lee, Rong-Shean, She, Chen-Hua, “Tool path generation and error control method for multi-axis NC machining of spatial cam”, International Journal of Machine Tools and Manufacture, Volume: 38, Issue: 4, pp. 277-290, March 1998
    10.Psang, Dain Lin, Ming, Far Lee, “NC data generation for 4-axis machine tools equipped with rotary angle head attachments to produce variable pitch screws”, International Journal of Machine Tools & Manufacture, Volume: 37, Issue: 3, pp. 341-353, March 1997
    11.Chen, Y.S. and Shaw, D., 2000, “Cutting Path of A Steward Platform Based Milling Machine to Bypass The Singularity” Chinese Journal of Mechanical Engineering, Vol. 21. No.2
    12.Lee, Y.S. and Chang, T.C., "Machined surface error analysis for 5-axis machining", International Journal of Production Research, Vol. 34, No. 1, pp.111-135, 1996
    13.Y. R. Hwang and C. S. Liang, “Cutting Error Analysis for Spindle-Tilting Type Five-Axis NC Machines”, The International Journal of Advanced Manufacturing Technology, Vol.14, pp.399-405, 1998.
    14.Y. R. Hwang and M. T. Ho, “Estimation of Maximum Allowable Step Length for Five-Axis Cylindrical Machining”, Journal of Manufacturing Processes, Vol.2, No.1, pp.15-24, 2000.
    15.Y. R. Hwang, “Cutting Error Analysis for Table-Tilting Type Four-Axis NC Machines”, The International Journal of Advanced Manufacturing Technology, Vol.16, pp.265-270, 2000.
    16.黃衍任、何明哲, “主軸旋轉式五軸NC加工機之切削誤差分析”, 中國機械工程學會第15屆全國學術研討會論文集, pp357-364, 1997
    17.Y. R. Hwang and M. T. Ho, ”Tool Trajectory Error for Table-tilting Machines”, Proceeding of the 10th ICPE, 2001.
    18.M. T. Ho and Y. R. Hwang, “A New Decision Algorithm of Maximum Allowable Step Length for 5-Axis Table-Tilting Type Machining”, Journal of the Chinese Institute of Engineers (summit).
    19.D. C. H. Yang and T. Kong, ”Parametric Interpolator Versus Linear Interpolator for Precision CNC Machining”, Computer-Aided Design, Vol.26, No.3, pp.225-233, March 1994.
    20.Sabin, M A, “The use of piecewise forms for the numerical representation of shape”, Report 60/1977 Computer and Automation Institute, Hungarian Academy of Sciences, 1977.
    21.Akima, H A, “New method of interpolation and smooth curve fitting based on local procedures”, JACM Vol.17, pp589-602, 1970.
    22.Goodman, T N T and Unsworth, K “Shape interpolation by curvature continuous parametric curves”, Comput. Aided Geom. Des. Vol.5, pp323-340, 1988.
    23.D.S Meek and D. J. Walton, “Approximating of discrete data by G1 Arc splines”, Computer-Aided Design Vol.24, No.6, pp.301-306. 1992.
    24.J. Hoschek, “Circular splines”, Computer-Aided Design, Vol.24, No.11, pp.611-618, 1992.
    25.M.K. Yeung and D. J. Walton, “Curve Fitting with arc splines for NC tool path generation”, Computer-Aided Design, Vol.26, No.11, pp.845-849, 1994.
    26.Hua Qiu, Kai Cheng, Yan Li, “Optimal circular arc interpolation for NC tool path generation in curve contour manufacturing”, Computer-Aided Design, Vol.29, No.11, pp.751-760, 1997.
    27.陳燕鴻, 范光照, 林顯昌, “三維曲面加工路徑最佳化處理之研究”, 中國機械工程學會第十三屆學術研討會, 1996.
    28.張振彰, “高效率雕刻曲面之刀具路徑”, 國立中正大學機械工程研究所碩士論文, 1997.
    29.蔡永霖, “複雜曲面NC程式模擬與改善”. 國立中正大學機械工程研究所碩士論文, 1998.

    QR CODE
    :::