Summary: | 碩士 === 正修科技大學 === 機電工程研究所 === 101 === The geometry of the helical rotor is designed with variable pitch lead blades and variable groove depth. The variable pitch lead blades are all ruled surface. As the helical rotor is normally complicated in design to achieve the required performance, it can cause overcut and collision problems during machining. In this paper, the geometry of the helical rotor is modelled based on solid modelling technique. Rapid prototyping model is fabricated from three-dimensional CAD model for concurrent development. The flank cutting technique is applied to rough and finish machining processes. Through the application of CAM software, the interference-free toolpath and the cutter location for four-axis NC machining are generated. To ensure the machining accuracy, the mathematical error is used as the basis for generating appropriate toolpaths. To avoid collision between machine tool components, the generated toolpath is verified before actual machining through solid cutting simulation.
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