臺灣博碩士論文加值系統

摘 要
本論文是針對五軸NC加工常見的倒勾、過切、碰撞等問題，提出先計算初始刀具軸向，再輔以干涉檢測，最後產生無干涉之刀具路徑及刀軸軸向的方法。所提的方法處理程序包括：
(1)首先將欲加工的曲面藉由等扇形高度(Constant Scallop-height)理論及弦高控制(Chordal-deviation Control)理論，轉換為離散的點資料後，再以所計算出的點資料規劃刀具路徑。
(2)接著利用CC point(Cutter Contact Point)的切線向量水平夾角與CL point(Cutter Location Point)之間的連線向量水平夾角做角度極值的比較，而得到最佳的初始刀軸軸向。
(3)定義了初始刀軸軸向之後，接著作過切、碰撞的檢測。若有過切的現象，則作刀軸提刀修正的動作。若有碰撞現象，則利用和向量及C-space理論偏擺刀具至無干涉的方位。
本論文除著重理論探討外﹐並以ACIS為幾何核心程式，開發一套視窗環境下的系統軟體，針對三軸NC加工無法解決的工件，進行五軸加工處理以及刀具路徑的模擬，以驗證所提方法的可行性。

Abstract
This study proposes the methodology to solve the gouging and collision problems typically found in 5-axis NC machining. A two-stage approach is proposed which finds an initial orientation at the first place, and then uses interference checking to obtain the final tool orientation. The procedures are set as follows:
(1)Convert the to-be-machined surface into discrete data points based on the allowable scallop height and chordal deviation.
(2)For each point to be machined, find an initial tool orientation by comparing the angles formed by tangent vectors of the cutter-contact points with those formed by vectors among cutter-location points.
(3)Check the occurrence of gouging and collision for a specific initial orientation. If gouging takes place, the cutting tool is moved along the tool axis. For the case of collision, the concept of vector fields and the method of configuration space are applied to adjust the tool orientation until all obstacles generated from collision cease to happen.
In addition to proposing the methodology, this research adopts ACIS as the geometric kernel to develop a Windows-based prototype system, verifying the feasibility of the proposed approach to solving the problems encountered in five-axis NC machining.

摘要
Abstract
誌謝
目錄
圖表索引
第一章 緒論
第二章NC加工刀具路徑規劃
2.1刀具路徑之步進長度(Step length)
2.2刀具路徑之路徑間距(Path Interval)
2.3刀具路徑規劃流程
第三章初始刀軸方位規劃
3.1基本觀念
3.2決定刀具初始方位
第四章 規劃干涉檢測點
4.1法則依據
4.2干涉檢測點規劃流程
第五章 干涉檢測與修正
5.1 基本觀念
5.2演算流程
5.2.1刀頭端過切檢測及提刀修正
5.2.2刀腹碰撞檢測及偏擺修正
第六章 系統功能之執行與實例
6.1實例一
6.2實例二
6.3實例三
第七章 結論與未來研究方向
參考文獻
作者簡介

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