Research On The Optimization Of The Production Process Of Electronically-controlled Automotive Electronic Products

The production process of electronically controlled automotive electronic products generally includes surface mount technology(SMT)and through hole insertion technology(THT).SMT uses solder paste printing,placement and reflow soldering processes to mount SMD components on the surface of printed circuit boards(PCB),and THT inserts plug-in components to the PCB surface through plug-in and wave soldering.With the rapid growth of market demand for electronically controlled automotive electronic products,optimizing the operation of the production system and improving the efficiency of the production system have become more and more important.Based on the "New Model Application of New Energy Vehicle Electronic Control System" project,this thesis studies the optimization of the production process of electronically controlled automotive electronic products from the perspective of SMT load balance and SMT and THT production scheduling optimization.Firstly,the production process of electronically controlled automotive electronic products is summarized,and the collaborative placement method of modular placement machines and the scheduling logic of SMT and THT production system are discussed,and the main factors affecting the efficiency of the production system are analyzed,thus clarifying the research content and ideas of the thesis.Secondly,this thesis conducts in-depth research on the load balance of placement tasks under the cooperative working mode of multiple placement machines.During this procedure,the influence of different types and sizes of components to be mounted to the mounting speed is analyzed,and the nozzle switching strategy in the mounting process is proposed.A load balance optimization model for placement tasks is established.Based on this model,a genetic algorithm is designed to find solutions.Simulation experiments are carried out to verify the effectiveness of the algorithm,and the processing time of mount process before and after optimization is compared and analyzed.Then,the two-stage scheduling optimization problems of SMT and THT are further studied.The product production system of electronically controlled automotive electronic productsis simplified into a two-stage hybrid assembly-line production system to build a two-stage production scheduling optimization model.Based on the idea of joint cross optimization,a simulated annealing algorithm is designed.Simulation experiments are carried out to compare the effectiveness of the algorithm and the production cycle and delay time before and after the scheduling optimization.Finally,the research content of the thesis is summarized,and the follow-up research work is discussed.