臺灣博碩士論文加值系統

對於需要與傳動機構設計配合的空間凸輪加工，向來均以專用機及專用軟體依創成銑削來製造，無法使用泛用型CAD/CAM系統產生所需的刀具位置檔案。但由於嚙合件之幾何外形時常相當複雜，使得刀具的選用受到限制。因此本文以具船形嚙合件繞線凸輪(Spool Winding Cam)機構為例，基於創成與雕刻複合銑削法，建立空間凸輪多軸加工刀具位置檔，以突破創成銑削法的限制。首先依據凸輪與嚙合件的幾何外形與運動特性，進行繞線凸輪曲面推導與刀具位置與方位之設定。再透過依工具機構形所開發之後處理程式，產生銑削繞線凸輪的數值控制程式。經由幾何建模與實體切削模擬軟體的模擬與試切削實驗，證實了所提之方法可實際運用於繞線凸輪四軸數值控制銑削加工。

To obtain the flexibility of choice of cutting tool and to compensate the wear of the cutting tool, this thesis presents a interference-free toolpath generating method which combines the advantages of the generating method and the sculpturing method for machining a spatial cam. The notion of the proposed method is that the cutting tool is confined within the meshing element and the motion of the cutting tool follows the meshing element so that collision problem can be avoided. To demonstrate the proposed toolpath generation, a type of spatial cam with boat shape meshing elements called spool winding cam for loom mechanism is selected.
Based on the envelope theory, homogeneous coordinate transformation and differential geometry, the cutter location using the cylindrical end mill is derived and the cutting path sequences with the minimum lead in and lead out are planned. In order to establish the interface between the design and the manufacture of spatial cam, the postprocessor for multi-axis machine tool is developed. The generated toolpath is verified before actual machining through solid cutting simulation. Then, the toolpath is converted into NC program by the postprocessor. The five-axis machine tool is used to perform the actual machining. The proposed methodology can be used to automate the programming of tool paths for four-axis machining of spatial cam.

摘要
ABSTRACT
誌謝
目錄
表目錄
圖目錄
符號說明
第一章 緒論
1-1 前言
1-2 文獻回顧
1-2-1 共軛曲面設計與製造之文獻回顧
1-2-2 具共軛運動特性之載具加工法之文獻回顧
1-2-3 刀具路徑規劃之文獻回顧
1-2-4 後處理之文獻回顧
1-3 研究架構
第二章 基本原理
2-1 座標系統轉換矩陣
2-1-1 座標系統轉換矩陣
2-1-2 繞任意軸旋轉之轉換矩陣
2-1-3 歐拉角轉換
2-2 共軛曲面嚙合原理
第三章 凸輪運動曲線
3-1 空間凸輪類型
3-2 無因次化運動曲線
3-3 修正等速度曲線
第四章 圓柱凸輪曲面之產生
4-1 圓柱凸輪曲面幾何設計
第五章 刀具路徑產生
5-1 共軛曲面加工方法之比較
5-1-1 創成銑削法
5-1-2 圓柱端銑刀創成與雕刻複合銑削法
5-2 圓柱端銑刀之刀具位置推導
5-3 刀具路徑規劃
5-3-1 路徑規劃
第六章 五軸加工後處理程式設計
6-1 後處理程式概述
6-2 五軸加工之幾何定義與型式分類
6-3 工作台傾斜型五軸工具機後處理程式
6-4 數值控制程式產生
第七章 結果與討論
7-1 圓柱凸輪之曲面方程式與實體建模
7-2 刀具位置與路徑之規劃
7-3 實體模擬刀具路徑驗證
7-4 模型比對分析
7-5 模型材料試切削
第八章 結論與建議
8-1 結論
8-2 建議
參考文獻
附錄一 MDV551-5AX五軸加工中心機台參數

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