Research On Key Technology Of Intelligent Process For Large Ship Engine Cylinder Block Based On MBD Feature

At present,when domestic enterprises are facing the design and processing of large box parts,complex process planning knowledge not only causes the machining center to fail to exert its efficient processing efficiency,but also makes production costs and labor intensity of the staff not achieve the expected improvement.In view of the MBD process information model owns the accuracy and intuitiveness of conveying process information,using the full three-dimensional process information as the sole carrier of product processing information has become a new trend for process computer-aided systems to solve the process design and processing of large and complex parts.Based on the research status of key issues in MBD technology and CAPP system,this paper has studied the process optimization issues of large cylinder design features.The specific research contents are as follows:First of all,the three-dimensional process information model combined with MBD technology is defined,and the composition of the process model data set is introduced in detail.A method for reasonable expression of complex parts’ process information in PMI of NX is proposed.It is easy to produce a hedgehog phenomenon in a large number of labeled information,which is not conducive to obtain information.The NXOpen library is used for secondary development of NX to achieve hierarchical query of information.Secondly,the manufacturing-based auxiliary feature for large and complex cabinet parts is proposed under the analysis of the actual requirements for 3D process parameter query of large and complex cabinets and the current feature recognition technology.The analysis of the actual requirements for 3D process parameter query of large and complex cabinets and the feature recognition is achieved by extending the attribute adjacency matrix diagram.The process-assisted system lays the foundation for intelligently acquiring three-dimensional annotation information.It lays the foundation for the process-assisted system to acquire three-dimensional labeling information intelligently.Fourthly,this paper has established a BP algorithm processing decision network model based on manufacturing features by analyzing the typical characteristics of large box parts and the main factors of processing plan decision,and has introduced the decision process of the model and the coding method of network’ related parameters.Then,a mathematical model has been established through analyzing the problems to be optimized in the process planning of large and complex parts and related processconstraint knowledge,which is aimed at the minimum replacement cost and shortest machining distance among tools,fixtures and machine.And this paper has introduced the setting and calculation process of important parameters in genetic-ant colony algorithm in detail.Also a six-cylinder large ship engine block is used as an example to verify the effectiveness of the optimization model.Finally,aiming at the actual process design requirements of large and complex box parts,the QT graphical interface development environment was used to develop a large-cylinder block process-assisted application system.A six-cylinder large-scale ship engine block was used as an example to verify the feasibility and practicability of the above theoretical research.