從STL模型產生鞋底噴墨塗膠軌跡之方法

Abstract

本論文之目的為利用Stereolithography (STL)模型以產生鞋底之塗膠軌跡，並應用於製鞋產業。在STL模型檔案中只包含了獨立的點資料以及面資料，但是卻缺乏點、邊、面之間的拓樸資訊。然而在產生塗膠軌跡的過程中，這些拓樸訊息對於鞋底輪廓線的尋找是必要的。因此，本論文以C++語言開發一拓樸重建程式，用於對頂點資料進行冗餘消除，並且建立點、邊、面之間的拓樸關係。此外，本程式之結果也經過歐拉公式之驗證，確保拓樸訊息的正確性及完備性。鞋底模型之輪廓線往往位於鋒利邊緣，其相鄰之兩平面法向量間夾角幾乎垂直。利用此一特徵條件，可以從STL模型之拓樸訊息中尋找出鞋底輪廓線。進而通過對鞋底輪廓線之偏移及投影，獲得鞋底表面上之塗膠軌跡。該軌跡以三維折線的形式輸出，並應用在所開發之塗膠系統中。為了提高塗膠品質，本論文亦提出一方法，利用平面度評估將塗膠軌跡分割為適當分段。由於考量鞋底噴塗系統之高度解析度，此一方法確保了噴塗之品質。最後，將實際鞋底模型安裝於所開發之塗膠系統，並將黏著劑均勻塗佈於鞋底表面。結果顯示了本研究所產生鞋底塗膠軌跡之有效性及可行性。

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.