| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 93 === The centrifugal impeller is a three-dimensional twisted surface. The energy is generated by velocity and pressure converting. The centrifugal impeller has some hard works, such as the interference of machining, the complex shape of blades, the difficulty in setting up blades and multi-axial machining, and the complicated fluid characteristics. That includes the flow simulation method and five-axial machining technology, and the related technique is also the key point of national defense industry. It is difficult and expensive to get the technique in Taiwan. Obviously, it is an important business that how to design and to analyze the performance of centrifugal pump accurately. There has many obstacles to overcome.
Therefore, the volume swept method based on the generated machining concept is advanced by the design of centrifugal impeller in this research. And it is discussed that how to create the profile of centrifugal impeller and machining method. The analytical spline and the rational B-spline will be introduced for the space-curve construction and curve parameters, fluid parameters, and machining parameters will be combined. Then it is found that the influence of curve on the performance of flow field. It is discussed that the fluid characteristics of tip clearance, the influence of tip clearance, and the twisted angle of impeller blades on the performance of flow field. Machining kinetic analysis of different curve is discussed in this research, and planning of tool path was worked by the concept of scallop height. At the same time, this research uses vector analysis to determine that the possibility of collision, and detects the possibility of over-cutting by the principal curvature. Finally, the performance of machining planning was estimated in this research.
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