Construction Of Digital Twin Model Of Flexible Assembly Line For Thin-walled Parts

In response to the market demand for multi-variety and small-batch assembly,flexible assembly lines have emerged.Flexible assembly is a fully digital design of the product assembly process to achieve the high flexibility and high efficiency of the assembly system as a whole,so as to adapt to the production needs of multiple varieties and variable batches.However,the intelligent development of flexible assembly lines puts forward higher requirements for assembly accuracy and system controllability.Digital twin,as a data exchange channel between the physical space and virtual space of the production line,is considered to be one of the effective methods to promote the intelligent assembly of products,and can effectively solve the difficulties that plague the intelligent development of flexible assembly lines.For this reason,based on a thin-walled part flexible assembly line,the digital twin model of the thin-walled part flexible assembly line was constructed for practical engineering application problems such as the assembly model disconnection,inaccuracy,and difficulty in field debugging during the assembly process of thin-walled parts.The specific research content is summarized as follows:(1)Twin modeling of flexible assembly line for thin-walled parts.The digital twin assembly line modeling method is divided into mathematical model and physical model,and the rapid modeling mechanism of digital twin assembly line that is constructed and driven by the physical model guided and driven by the mathematical model is clarified.The assembly line is classified and described and process analysis.Based on the rapid modeling mechanism of the digital twin assembly line,the construction of the digital twin model of the flexible assembly line of thin-walled parts is completed.(2)The digital twin assembly line update iteration.Based on the simulation analysis of the digital twin assembly line,quantitative indicators such as production capacity and utilization rate are determined.On this basis,with lean production as the core,the optimization work was carried out on assembly process and assembly balance,the optimization plan was determined,and the optimization plan was compared with the quantitative indicators before optimization to verify the feasibility and effectiveness of the optimization plan,which realize the digital twin assembly line update iterations.(3)Installation and commissioning based on the digital twin assembly line.Virtually debug the twin model of the flexible assembly line of thin-walled parts based on the PLC program to verify the rationality of the PLC logic and reduce the difficulty of on-site debugging.Based on the OPC UA,the mapping relationship between the physical entity and the virtual model of the thin-walled flexible assembly line is studied,and the information interaction of the assembly line-mathematical model-physical model is realized.(4)Development of a digital twin service system for thin-walled parts flexible assembly line.Based on the thin-walled parts flexible assembly line twin model,combined with Java web to design and develop a set of thin-walled parts flexible assembly digital twin service system.The system is oriented to actual needs and provides visual display and data presentation of real-time status information of flexible assembly lines for thin-walled parts.