Modular Design Technology Of Stones Machining Equipment Based On Kinematics Spectrum

Application of special shaped stones becomes increasingly wide and the special shaped stones become diversified and personalized, which require stone machining equipment manufacturers to develop and manufacture special shaped stones machining equipments which meet the processing needs of special shaped stones quickly. However, existing design methods restrict the development of equipment because of problems such as their low efficiency. Modular design enables rapid design of products through the selection and combination of modules. As a practical and efficient design method, modular design has been widely used in the field of mechanical engineering. Modular design technology is led into the design of special shaped stones machining equipments in this dissertation and the problems such as the partition, encoding and interface design of module during the modular design of shaped stones machining equipments are studied and explored deeply in order to provide a theoretical basis for the modular design of special shaped stones machining equipments and promote the process of modular design model in stone equipment manufacturing enterprises and achieve rapid design of equipment ultimately.Special shaped stones commonly used on the market are defined, classified and described. The shape of each kind of special shaped stones, processing tools commonly used and the shaping principle are analyzed, on the basis of which the shaping method and shaping motion are studied deeply. Shaping motion of the stones determine the structure of equipment, therefore the analysis of shaping motion lay the foundation for the development of special shaped stones machining equipment series model which face modular design. Machining motion combinations of special shaped stones can be obtained by summing up all shaping movements, and then kinematics spectrum of the machining of special shaped stones can be established under the CNC machine tool coordinate system. Equipment movement can be analyzed intuitively through kinematics spectrums, which provide guidance for both the analysis and decomposition of the equipments' function and structure and the partition of module.The preparatory work of modular design of special shaped stones machining equipment is done which includes several steps as follows. Firstly, the whole process of modular design is integrated planned. The process is divided into two stages which are the development of modular system and the design of equipment based on the modular system, besides, the development process of each stage are analyzed in detail, which provide guidance on the specific implementation of modular design; Secondly, based on the classification of special shaped stones and their motion analysis, special shaped stones machining equipment series model is developed and the function and structure of the series equipments are analyzed in detail, which lay the foundation for the module partition which based on the decomposition of function and structure; Thirdly, considering the characteristics of special shaped stones machining equipment, module partition principle for life-cycle is proposed which can effectively guide the module partition by combining the general principle of functional and structural independence.Considering the complexity of the structure of special shaped stones machining equipment, module partition is completed by the combination of axiomatic design, kinematics spectrum and fuzzy dendrogram. The product is gradually divided using the framework of zigzagging map between the functional domain and physical domain of axiomatic design. In the case that the design matrix are diagonal matrices, the substructures of the division meet the functional and structural independence and can be considered as a separate module, then the division of module can be ended. Based on kinematics spectrum, modules are mapped to a specific structural form and the ultimate module can be obtained. When the design matrices are triangle matrices or fall rank matrices, the relevance of function and structure between the substructures are analyzed and then fuzzy dendrogram is used to cluster the substructures into modules. Mathematical evaluation model of module partition program for product design which considering the complexity of cross-series design, longitudinal series design and replacement design as the optimization goal is established, by which module partition programs can be evaluated in order to get the most reasonable module partition program.In order to facilitate the management and computer-aided selection and combination of modules, each module is encoded in detail by considering the information of respective equipment series, functional and structural characteristics of modules. Based on the interface rules of the modular design rules, standardized design of module interfaces which includes the standardization of interfaces' structure and parameter is studied in order to facilitate the exchange and reorganization of the modules. On the basis of analysis and synthesis of interfaces' type, shape, parameters, functional flow direction and other information, interface model is established and information included is encoded. Interface model provides the core data in the determination of the relationship between modules and is the foundation for the matching recognition and combination between modules.Based on the study of the key technologies above, computer-aided modular design system of special shaped stones machining equipment is developed considering the design features of special shaped stones machining equipment. Firstly, the system's functional model is built using IDEF0 modeling method and system functions are divided into three parts including modular design, data management and collaborative design. Secondly, under the guidance of the functional model, the overall structure and run process of the entire system are planned and each subsystem is analyzed and designed in detail. Ultimately, an example is used to show the running process of the whole system.