| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 102 === More and more companies in machining communities utilize five-axis machines to carry out material processing of complex components. The purpose of such machines is to ensure better processing quality. However, in order to enhance the processing quality, the smoothness of toolpath for five-axis machining is very important. Therefore, in accordance with the characteristics of five-axis toolpath strategies, this thesis has divided the geometry of typical to-be-machined parts into the following five types: convex shape, U-shape, concave shape, hole shape, and annular shape. Subsequently, for each type of the five geometric shapes, this study proposes the setting principles and calculation equations of tool-axis orientation in order to facilitate the upgrade of the smoothness of toolpath. In which, the setting principles of tool-axis orientation include: From point, From line, Toward point and Toward line; whereas the calculation equations of tool-axis orientation are based on the consideration of minimizing the angle of tool-axis orientation. The latter uses the relative position between the tool and the workpiece to perform mathematical calculations in order to obtain the locations for the pivot point and the pivot axis of tool-axis orientation, so that the toolpath for processing the five geometric shapes can reduce the number of retracts and improve the surface smoothness. In addition to proposing the calculation equations for tool-axis orientation, this study adopted software packages to automatically calculate the toolpath of five-axis machining and used the toolpath that is calculated by the method proposed in this thesis respectively; as well as actually utilizing a five-axis NC machine to conduct machining verifications to compare the surface quality and the overcuts scenarios of both approaches.
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