Study On XML Based Knowledge Reuse Design Technologies Of Stamping Die

With the rapid development of manufacturing industry, sheet metal parts with more complex shape and higher manufacturing precision are widely used in automotive, aerospace, machinery, household appliance and other fields. Therefore, higher requirements are put forward for design and manufacturing of stamping die. Complicate factors in design phase is considered due to the complexity of sheet metal forming process, anddesign quality mostly depends on the experience of designer at present. Consequently, theory and methods based on knowledge engineering, combined with stamping die design knowledge, are significant to study digital technology of stamping die design and manufacturing. Key technology on stamping die design is researched in this dissertation. Adopting the latest frontier of knowledge engineering techniques—knowledge reuse, knowledge based stamping die design system is developed. As a result, efficiency and quality are improved during the design process.The difference of data, information and knowledge, knowledge classification and transformation are discussed in this paper. According to the analysis of related knowledge, design knowledge involving basic knowledge, standards, specification, typical case and process knowledge, is divided into element knowledge, model knowledge and case knowledge, so as to provide a basis for knowledge based stamping die design.With the analysis of current knowledge representation method and existing problems, considering the characteristics of intelligent design of stamping die design, a general architecture of knowledge representation and application based on XML (eXtensible Markup Language) is proposed. Key points of knowledge reuse throughout each stage of stamping die design are studied. Hierarchy and model on design knowledge reuse is established on the basis of the knowledge reuse theory and conceptual model. In order to realize the reuse for whole design process, knowledge reuse must be built on the development of CAD (Computer Aided Design), KM (Knowledge Management) and CBR (Case-based Reasoning) technology.Expression pattern and structure of element knowledge based on XML are put forward according to the research results of element knowledge during stamping die design phase, including definition knowledge, chart knowledge, formula knowledge and rule knowledge. Shape reuse model, which can be applied to geometry and feature knowledge reuse, is proposed aiming at shape related knowledge processing during the design phase of stamping die,. For standard parts, size knowledge and assembly knowledge are represented with XML in the design phase, consequently, knowledge based standard parts library is established to realize the self-adaption and pocket for standard parts.During the process of stamping die design, the development of new product is generally referred to successful design case. Consequently, knowledge reuse technology for stamping die design based on CBR is studied. Since process feature matching of stamping parts can be referred for case matching, similarity judgment method for stamping process feature is investigated in consideration of the characteristics of stamping die design. Thus, case based stamping die design is realized.Based on the theory and methods mentioned above, a uniform knowledge reuse module for stamping die design is developed on the platform of UGNX. It is verified by application that problem of knowledge reuse on stamping die design is solved with the theory and methods proposed in this dissertation, the system with high practicality is used in progressive die design module on the platform of UGNX.