並聯式工具機具備加工複雜曲面之能力，亦具有高速化、高精度之優點。而離心泵葉片為三維扭轉曲面，因此葉片加工較為困難，設計時除考慮葉輪效率外，亦需考慮葉輪加工問題。本研究有鑑於此，運用並聯式工具機加工離心泵葉片，並判斷加工之可行性。
離心泵葉片外廓係由五軸創成加工法結合數值曲線Rational B-Spline建構而成，由CFD軟體TASCflow計算離心泵之流場性能，並以具優秀效能之離心泵葉輪做為並聯式工具機加工之工件。
本研究由五軸創成加工規劃之加工路徑做為並聯式工具機之刀具路徑，由幾何限制(致動器長度限制、接頭旋轉角度限制、致動器間干涉)及非幾何限制(Jacobian矩陣行列式值)來判斷加工之可行性。計算結果發現可動平台之接頭旋轉角度過大，因此本研究提出二方法改善此情形(1)接頭安裝具傾斜角度(2)分段加工。本研究亦對不同刀具傾斜角及不同接頭旋轉角度限制做工作空間分析。
研究結果發現在接頭安裝具傾斜角度與分段加工時，搭配第四軸從動及工件旋轉情形下，幾何及非幾何限制皆在合理範圍內，且加工速度亦較五軸加工機提昇。分析結果指出本研究以接頭安裝具傾斜角度及分段加工時，加工離心泵葉片具有優越之速度與可行性。

The parallel type machine tool has the ability to process complicated curved surface, also has the advantages of high speed and high-accuracy. The present approach considers the difficulty to manufacture when the centrifugal pump impellers are composed of the three-dimension to turn back the curved surfaces. This design suggest using the efficiency of the impeller to improve the impeller manufacturing. For this purpose, this research proposes a specific method of parallel type machine tool and centrifugal pump impellers that raise its manufacturing feasibility.
Since the contour of centrifugal pump impellers consist of five-axis manufacturing process that combines numerical curve of rational B-spline as well as its applications in calculating flow centrifugal pump’s performance by TASCflow of CFD. With this object, it conducts centrifugal pump impellers of execellent performance for workpiece of parallel type machine tool which is made up of centrifugal pump impellers.
The research uses of geometric constraints and non-geometric constraints to determine feasibility of manufacturing work. The result of calculation shows the situation that joint angle of moving platform is too big to work. The proposing methods of situation are (1) install the joint are at an angle (2) manufacture in dividing sections.
The results of this research shows the geometric constraints and non-geometric constraints are all in limit range. Meanwhile, the speed of manufacture is fairly better than five-axis manufacturing process, under the situation of matching the fourth axle and workpiece to rotate. In this research, the results indicate when install the joint are at an angle and manufacture of divide section, those which are manufactured in the centrifugal pump impellers for superior speed and feasibility.

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