Research On KBE Based Cavity Design System For Injection Mold

In this dissertation, injection mold cavity design process and its key technologies are studied based on KBE (Knowledge Based Engineering) technique, and a prototyping system which is special for the mold cavity design of automotive lamp is developed. By using this system, the quality and efficiency of injection mold cavity design are improved.The development background and definitions of KBE are reviewed first. Then the KBE based product design process, difference between general design system and KBE based design system are studied. Based on these theories, the architecture, frame and development tools of KBE based design system are researched in detail. A KBE based mold cavity design system is presented, and key technologies of this system are discussed. The achievements of research on these key technologies are listed as follow:(1) The concept of feature mapping in the mold cavity design is systematically given and mapping process is researched in detail. An interactive feature recognition method and a mapping method based on feature classification are presented. With these methods, the integrated feature model of molded part and mold cavity is constructed.(2) Based on the visibility map, the orientations of features in molded part are easily confirmed. The optimization parting direction and real undercut feature are determined accordingly. A mesh based determination method for parting line and a GBR based generation method for parting surface are presented.(3) A method to determine the cutting tools and parameters in the machining process of mold cavity based on hybrid reasoning is presented. In the case retrieval, a new layered searching strategy and similarity measurement method are given. A multi-goal optimization method is proposed to optimize the cutting parameters.(4) A prototyping system which is special for the mold cavity design of automotive lamp is developed in the CAD/CAM software. The construction of product coding sub-system, rule library sub-system and two cases of mold cavity design for automotive lamp are analyzed.In the summary of this dissertation, a number of advanced topics for the KBE based mold cavity design system are addressed for the future research.