| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 106 === The purpose of this thesis is to generate the adhesive spraying trajectory of shoe sole from Stereolithography (STL) model files for footwear industry. STL model files contain only independent vertices and facets data. However, connectivity relationship between vertices, edges, and facets are absent. This information is necessary for contour line searching of shoe sole. A self-developed C++ program is used to reconstruct the topology information from STL model files. This program can conduct redundancy elimination on vertices data and build connectivity relationship between vertices, edges, and facets. In addition, Euler’s polyhedron equation is also applied to verify the validity of the topology information and the completeness of rebuilt information is guaranteed. The contour line of the shoe sole model is always on a sharp edge. The normal vectors of two adjacent facets are almost perpendicular to each other on the contour line. With this characterization condition, the contour line of the shoe sole can be searched from the topology information of STL models. Next, adhesive spraying trajectory can be obtained by offsetting and projecting the contour line on the shoe sole surface. This trajectory is exported in the form of 3D polylines, and used by the developed adhesive spraying system for adhesive spraying on the shoe sole. In order to increase the adhesive spraying quality, a method of separating the trajectory into adequate segments is proposed. The spraying trajectory would be divided into several printing patterns based on flatness evaluation. It guarantees the spraying quality with consideration of z-resolution in the developed adhesive spraying system. Finally, a real shoe sole is mounted on the spraying system and adhesive is uniformly coated on the shoe sole. The result shows that the spraying trajectory generated in this research can be used effectively and feasibly.
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