電腦輔助夾具規劃系統

Computer Aided Modular Fixture Planning System

林聖原(Sheng-Yuan Lin)

指導教授 ： 尤春風

國立臺灣大學/工學院/機械工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.10110

摘要

現今多樣少量的加工程序中，電腦輔助夾具規劃為不可或缺的重要一環，本系統遵循基本3-2-1法則，利用幾何投影的概念，依是否具基準面、稜柱型工件、歪斜工件等不同情形歸納法則，進行夾持點的規劃選擇，根據此時夾持點的位置高度，自動選取適當之定位或夾持元件，依據點所在的面之法向量方向或所在圓柱面軸線方向，計算放置夾具元件所需旋轉之角度。夾具元件繪製部分，利用繪圖軟體CATIA繪製相關元件。本研究主要依據工件幾何資料，以法則推理的方式，作定位點、夾持點的規劃，並結合電腦輔助製程規劃系統、使用者介面、夾具資料庫，提供各製程之夾具規劃結果、各夾具零組件圖、夾具規劃組合圖等完整之規劃結果，供使用者作檢測修改，希望藉此降低工業界製造生產成本，穩固加工品質，提升產業生產效能。

關鍵字

電腦輔助設計 ； 夾具規劃 ； 銑床

並列摘要

Computer aided fixture planning plays an active role in manufacturing operations for variety of product but a small quantity of batch recently. In this system, we follow the basic 3-2-1 locating principles, and use the concept of the projective geometry. A set of algorithms is presented to determinate the locating/clamping points by considering the different cases such as the datum planes, prismatic workpieces, and non-prismatic workpieces. The algorithms select the size of the fixtures by the height of the locating/clamping points. According to the normal direction of locating/clamping points on the plane or the axis of cylindrical surface the points is located, we calculate the distance to move or the angle to rotate for putting the fixture to the correct position. The portions of the fixture elements are drew by drafting software CATIA. This paper uses the rule-based method to configure the locating/clamping point in terms of the geometry of workpiece. This article combines with computer aided process planning system, user interface, and the fixturing database, and provides the result of every step of process planning, and the graph of fixture elements and of the assembly of fixture planning. This research can lower the cost of manufacturing, and raise the producing efficiency and the quality of manufacturing in the industry.

並列關鍵字

computer aided design ； fixture planning

參考文獻

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