Research On Optimization Of Assembly Line Production Line Based On Lean Construction

Due to the variety of specifications of the parts in the current situation,the assembly parts production line is basically based on orders,and there is no cycle inventory,so it is not suitable for traditional large production methods.Lean production is aimed at customers and is the best production method for multi-variety and small-volume products.Since its birth,the practical application of lean production has proved its value.Lean production mode is the effective way for modern enterprises to enhance their competitiveness and increase profits.The lean concept was applied to analyze the two production lines and optimize the production line in this paper.The balance rate of the company’s laminated floor production line is low,there is a big waste and much room for improvement.Based on the field research,the production process of the laminated floor was analyzed,and the time of the process was measured by the stopwatch method and converted into the standard working time.Based on the standard working time,the production line balance model of the laminated floor production line is established,and the improved genetic algorithm is used to solve the process arrangement of the working number of 3-7,and the theoretical process arrangement result is obtained.On the basis of the theoretical process arrangement,the lean principle is applied to improve the theoretical results in combination with the actual situation,and the optimal process arrangement is obtained in accordance with the actual situation.The balance rate of the improved laminated floor production line has been greatly improved,the production blockage phenomenon has been obviously alleviated,the production tact time has been significant reduced,and the production line production efficiency has been significantly improved.In order to ensure the operation of the production line,the Kanban mechanism is used to control the production of components to ensure the timely delivery of materials and the production line runs smoothly.And in order to improve the level of production line information management and achieve lean production,BIM related technologies including mobile lightweight models and BIM cloud platforms was used.Company B is a steel structure prefabricated component factory,which mainly produces H-beam steel.Due to the low balance rate of the production line and the push-type production is implemented,resulting in too many semi-finished products,serious waste in the process,and the workers have a lot of idle time.This phenomenon is exacerbated by the fact that the components move using a crane instead of a conveyor belt.Therefore,according to the actual situation of the production line of company B,firstly,according to the various characteristics of the H-beam steel produced by the production line,the research object is divided into three kinds of specifications and studied separately.Second,the method of time study is used to measure the process time,and the balance rate of three kinds of specifications of components are calculated.The balance rate of the production line of the component is found to be not high.Therefore,the improved genetic algorithm is used to establish the production line balance model of the component,and the production process is re-allocated according to the results obtained by the model and the actual situation;After optimization,the takt time of the production line is reduced,and the balance rate of the production line is improved.Third,in order to ensure the operation of the production line,the "one-piece flow" production principle and the kanban control mechanism are strictly implemented,and the production and material transfer of components are strictly controlled.Use BIM technology to strengthen communication between processes to ensure timely delivery of information.This paper comprehensively applies genetic algorithm,lean production theory and technology,BIM technology to study these two production lines.The optimization results show that the balance rate of production line is improved;the bottleneck process is optimized,a lot of waste is eliminated,and semi-product in the process is reduced.The takt time and production costs are reduced.The application of BIM technology in the production line is explored,can provide a reference for similar cases.