| The rapid rise of the new energy vehicle industry has brought new development momentum to the automotive industry,and its innovative business model and ultimate user experience have attracted a large number of consumers.n is a domestic start-up new energy vehicle company,and its emerging business operation model,ultimate user service concept and industry-leading technology advantages have brought n abundant user orders.Therefore,improving production efficiency,reducing manufacturing costs,ensuring product quality and fast delivery of customer orders in the manufacturing operation process have become important tasks for the future development of Company N.After on-site research,we found that the following main problems exist in Company N’s final assembly workshop:(1)Production line imbalance problem.On the basis of single model manufacturing,other models are introduced one after another,resulting in mixed manufacturing of multiple models,leading to unbalanced production lines.By applying the theory of operation measurement in basic industrial engineering,the actual operation time of 66 processes of 4 models is obtained,and the standard operation time of 66 processes and the beat time of different workstations are obtained by introducing the evaluation coefficient and relaxation rate.Based on the collected data,a simulation model was created by Plant Simulation software,and the results of the model showed that multiple workstations were inefficient.(2)Multi-model mixed production assembly action problem.In the interior trim line,there are a large number of screws,plug covers and wire harness fastening operations,so there are many non-value-added actions such as repeated walking and picking up,which waste a lot of time and also bring a large workload to the operators.Therefore,the research results of this thesis are as follows:(1)Based on the integer planning accurate algorithm,the minimum number of workstations is optimized and the workstation length is shortened based on the known established beat of the production line.Then,we use Plant Simulation software to build a simulation model before and after the optimization,and compare the results before and after the optimization.The final results showed that the number of workstations decreased from 16 before optimization to 13 after improvement,and the balance rate of the production line increased by 23.6% at the same time;(2)Based on the theory of lean production and the MTM method,the action analysis table was prepared by organizing the collected job operation videos and introducing the concept of three types of work hour subdivision to identify the value-added and non-value-added actions,and the 5W1 H questioning method was applied to explore the feasibility of the assembly action The feasibility of optimization is explored by applying the 5W1 H questioning method.By applying ECRS principles to eliminate and rearrange operation steps,the number of non-value-added actions was reduced,and the operating time and personnel workload were reduced;(3)Based on lean thinking and standardized system construction,a standardized lean manufacturing system oriented to value creation was established by drawing on industry experience and combining N’s operational characteristics and corporate values to promote optimization and improvement with the participation of all employees,further This thesis is based on a study of Company N’s multi-model hybrid manufacturing system.By carefully analyzing and continuously optimizing the two major problems that affect the operational efficiency of Company N’s multi-model hybrid production line:production line imbalance and operator movement,this thesis effectively improves the operational efficiency of Company N’s final assembly production and provides good improvement ideas and optimization strategies for the new energy vehicle industry to improve production line operation.This thesis has 26 figures,20 tables and 75 references... |
