Research And Development Of Camshaft NC Grinding Process Intelligent Application System

Grinding process is an important processing method of machinery manufacturing industry. In most instances, grinding process that acts as the last manufacturing procedure directly decided the manufacturing quality of a manufactured product. At the moment, the principal problem facing the grinding process is extremely dependent upon the experiences of the worker. Grinding process solution is mainly still determined by conventional trial cut and empirical approach, which could be lower efficiency and worse flexibility and would to make it dificultly when the grinding process knowledge data be accumulated and reused. Camshaft is one of the key parts of many industries such as vehicle, internal-combustion engine, national defense and so on. Its processing accuracy and efficiency has directly influenced on the quality, life and energy-saving standard of the engines and other allied products.Tthis paper kept the camshaft NC grinding as object of study, and took process optimization and intelligentize as method. A software platform, that specially aim at camshaft NC grinding process intelligent optimum decision and digital control processing, has been developed. This software platform has a base process database and a process intelligent database. The base process database contains data of machine tool, grinding wheel, material, coolant and process auxiliary, etc. The process intelligent database stores data of process case, rule metadata, prediction model and so on. Based on the databases, the software platform can execute camshaft grinding process solution intelligent optimum decision and automatically NC programming. There was so much study content involved of the software platform that this paper could only analysis and discuss those objects as grinding process system movement modeling, system framework of camshaft NC grinding intelligent software platformware, grinding process problem definition,3D virtual machining of grinding process system, digital control grinding automactically NC programming and so on. The main study work included as follows:The intelligent software platform frame of camshaft digital control grinding has been built. The operating framework and the functional module of system have been defined including the expert system of grinding process module, the intelligent optimum decision of grinding process module, the error analysis and intelligent compensation module, the process problem definition module, the3D virtual grinding simulation module, the grinding speed optimization and regulating module, the automactical digital control grinding module, the general mathematical model solving module, the base process core database and process intelligent database module. The entire property of the main functional modules and the technical ideas used are also analysised.The process problem of workpiece was defined. The information structure detail of process problem was detailedly studied. The process classification concrete determining was discussed and a means of classification was provided. The manufacturing resources information model and part information model based on ormation theory are created. On the basis of the two models, the whole architecture of process problem was provided and the general description information model of process problem was also built. According to camshaft specific grinding process, the procedure of camshaft grinding process problem model building was elaborated, and the theoretic model of camshaft grinding process problem space has been created, and the theoretic model has also been instantiated.Development and implementation of camshaft grinding3D virtual simulation technology were theoretical analysised and practical researched. According to practical situation of enterprise, general requirement and overall technical architecture of camshaft grinding simulation were brought out. The framework of3D virtual simulation was specifically schemed out and the main constitutive functions were also programed. The grinding process system theoretic models including geometrical framework model, system kinematics model and the kinematics assembly tree were created. The path movement data driven principle and method of virtual kinetic simulation were discussed. The3D virtual simulation environment and realistic scene grinding movement simulation of camshaft grinding were realized by adopting OpenGL technique.The automatic NC programming framework architecture of camshaft digital control grinding has been confirmed and realized, and it’s technical framework has been provided. The theoretical study of wheel path layout and automatical computation were done. The path automatical planning and calculational procedure have been proposed. The movement analytical principle of machine tool all motion axles, which were based on wheel path, particularly discussed. The general analytical model of axles motion was been created. The data driven of machine kinetic simulation was achieved by this model. At last, the NC program has been builded by those data of driven, and also been used to real part machining.The theoretical model of constant linear velocity grinding process of camshaft has been established according to the X-C Axis linkage motion principle of grinding machine. Base on this theoretical model, a numerical calculation model of grinding speed optimization and regulation has also be built by way of cubic spline fitting interpolation method. Combined with the specific camshaft part and the real parameter of the grinding processing plan, the processing motion data all of grinding machine kinematic axises were calculated. And then the motion data were automatically changed into NC processing program of specified numerical control system without processing faults.By the way, the machining precision, surface quality and processing efficiency of camshaft would further more improved.The camshaft digital control grinding intelligent software platform has been developed and experimental verified. The soft programming approach and interface development have been done about the overall intelligent software platform, the process problem definition module, the3D virtual grinding simulation module, the grinding speed optimization and regulating module and the automactical digital control grinding programming module, and all of models have been systematically integrated. At last, the software platform rationality and validity have inspected and verified by a certain camshaft grinding machining practice.