An integrated Environment for Reverse Engineering with CAD Design Capabilities

• Main Authors: Chen, Hsin-Chuan, 陳信全
• Other Authors: Hong-Tzong Yau
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/97925435975243237012

碩士 === 國立中正大學 === 機械工程學系 === 85 === The use of CAD system and the development of reverse engineering techniques have drastically changed the traditional procedure of mold design and manufacture. As proven in industry applications, it reduces the cost and the labors of manufacture, and it increases efficiency and the competitive edge. Therefore, in order to enhance the level of design automation, the industry has shown much interests in this technology.A CAD system is ideal for conceptual design.But for complex objects with contour geometry, it is difficult to construct the models precisely without appropriate geometric information.On the other hand, reverse engineering utilizes the scanning of objects and can capture the geometry of complex objects. However, the creation of CAD models from the scanned data is not a simple process. Therefore, how to integrate reverse engineering techniques with CAD system capabilities has become the major research issue. The goal of this research is to develop an integrated environment that combines reverse engineering and CAD design capabilities. By taking advantage of the strong points of both technologies, it can significantly reduce the product development time. In the developed system, the digitized data obtained by CMM or laser scanning is preprocessing to filter out the measurement noise. Edges or surface boundaries are then detected by edge finding techniques.NURBS surfaces are then fitted to the segmented regions. At this stage, the surface modeling relies heavily on curve and surface modeling techniques that are usually seen in traditional CAD system. As a result, the speed and efficiency of surface creation is highly improved.The resulting surface patches are then connected to form a closed volume, or a solid model.In the end, the created CAD model can be transferred to other CAD/CAM system by standard IGES translation.