Assembly Process Planning And Simulation Verification Of New Vehicle Models In Automobile Assembly Line

With the maturity of China's automobile market,the operation of the automobile industry is stable and the competition is increasingly fierce.The change of enterprise product category is accelerating to cope with the dynamic and continuous change of demand.As the final part of the four major automotive processes,the efficiency and quality of the assembly line process planning determines the speed of new models on line,directly affects the market competitiveness of products,and becomes one of the key links in the competition between automotive enterprises.Various market demands have led to the transformation of automobile production mode into multi-vehicle mixedmodel assembly line.Mixed-model assembly mode brings flexible operation to enterprises,but also causes negative effects such as production complexity and process opacity.In mixed-model environment,the task and difficulty of new vehicle process planning are significantly increased.It is a important problem to be solved for vehicle enterprises to shorten the process planning cycle and improve the rationality of process documents by using scientific methods and theories.This paper takes W company's automobile assembly line as the research object,and analyses the problems existing in its process planning and production operation.The main research work and achievements are as follows:(1)Aiming at the problem of slow man-hour quota of new vehicle model,the assembly man-hour is studied and classified through the analysis of the characteristics of assembly operation.Based on the historical man-hour data,the similarity coefficients of the parts to be measured are compared,and the correlation functions are obtained by fitting the similarity coefficients with the man-hour.Combining with grey theory,two kinds of prediction models of man-hour are built,which have good accuracy and applicability.(2)Aiming at the problem of low employee satisfaction caused by traditional TimeDimension line balancing schemes,this paper introduces the theory of human factor engineering fatigue load,proposes to optimize the allocation of assembly line tasks from two dimensions of time load and fatigue load,and combines genetic algorithm to plan the mathematic model solution path of mixed-model assembly line balancing.The optimized schemes has gained some advantages when it is aligned with traditional Time-Dimension line balancing schemes.(3)Aiming at the problem of high-load bottleneck workstation caused by lack of validation of assembly process and method,the simulation model of production line and target workstation is built,and the feasibility of operation method is verified by multi-angle analysis of the workflow with applicable human factors tools.The unreasonable,unsafe and uneconomical operation settings in process planning are optimized,so as to provide safe operation for personnel and assembly line work.Clear barriers to efficient assembly operation.