Industry 4.0 promotes the development of traditional manufacturing industry to digitization, networking, and intellectualization.\nSmart factory is composed of network that includes production equipment, robot, conveyor, and logistics system. According to the\ncharacteristics of the mixed flow assembly, a simulation platform of automobile mixed flow assembly is built based on industry 4.0\nin the paper, which operates and manages automobile assembly, logistics warehouse, and CPS effectively. On this basis, FlexSim\nsoftware is adopted to establish the auto-mixed assembly model that finds out the bottleneck of auto-mixed assembly problem. By\nmeans of parameter adjustment, rearrangement, and merger of process, the whole assembly time of the 500 automobiles dropped\nby 33 hours, the equipment utilization rate increased by 20.19%, and the average blocked rate decreased by 21.19%.The optimized\nresults show that the proposed model can greatly increase manufacturing efficiency and practical application in industry 4.0.
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