Reconfiguration Optimization Of Mobile Phone Semi-automatic Assembly Line Under Frequent Changeover Situation

In recent years,3C electronic assembly industry has become one of the pillar industries in China.The development of the industry is very fierce,and the industry competition is extremely fierce.These development characteristics are particularly prominent in the mobile phone assembly industry.In order to respond to the market demand at any time,the mobile phone assembly industry urgently needs a new type of assembly system,so as to make it stand out in the fierce market competition.Under this demand background,semi-automatic reconfigurable assembly line of mobile phone has been developed,which makes the whole line assembly of mobile phone modular,intelligent and flexible,and effectively solves the problems of high-frequency production change and urgent delivery.As one of the main means to meet the market demand of multi variety and small batch customization,reconfigurable assembly system has attracted the attention of a large number of domestic and foreign scholars in recent years.Under the background of the policy of "made in China 2025" issued by the Ministry of industry and information technology to stimulate the transformation and upgrading of the manufacturing industry,the research on the design and construction of semi-automatic reconfigurable assembly line for mobile phones has achieved a certain breakthrough,but the research on how to realize the reconfiguration and configuration optimization of multiple mobile phone assembly orders changing frequently in a production cycle is still in its infancy.Aiming at the current situation of frequent production and line change in original equipment manufacturer(OEM)enterprises,this paper proposes a minimum reconfiguration cost optimization method for mobile phone semi-automatic assembly line under high frequency production change.This method combines the analytical target cascading(ATC)and improved genetic algorithm(GA)to construct the minimum reconfiguration cost algorithm,which solves the problem of frequent production change and reconfiguration of multiple mobile phone assembly orders in a production cycle.This method realizes the smooth switching of the whole production line when the production is changed frequently,and reduces the reconfiguration cost of the whole production cycle as much as possible.The main contents of this paper are as follows(1)Aiming at the problem of frequent production change and reconfiguration of multi mobile phone assembly line,this paper introduces the coupling theory to analyze,compares several common coupling optimization methods,and analyzes the unique advantages of using objective cascade method to solve complex coupling problems.Secondly,through the research and analysis of complex coupling problem,it is found that its essence is the coupling problem of order scheduling,assembly line balancing and buffer configuration.Finally,according to the fact that OEM enterprises pursue to reduce manufacturing cost as much as possible,the coupling problem is equivalent to the minimum reconfiguration cost problem in a production cycle.(2)An evaluation method of assembly line completion time based on Max plus algebra is proposed,and the calculation method of production cost combined with delivery constraints and production change reconfiguration cost of assembly resource change is derived.Then,using the coupling optimization idea of ATC modularization and hierarchical iterative analysis,a scheduling model of minimum reconfiguration cost(MRC)for multi mobile phone assembly order based on ATC is established.(3)Aiming at MRC scheduling model of multi mobile phone assembly order,a minimum reconfiguration cost optimization algorithm based on ATC and improved GA is proposed.According to the characteristics of MRC scheduling model,the problem model is divided into two layers: order scheduling layer and production line reconfiguration layer,and the genetic algorithm strategy is improved and the whole scheduling optimization algorithm process is designed for these two layers.In addition,the effectiveness of the algorithm is proved by a practical case.(4)The minimum reconfiguration cost system is developed.The minimum reconfiguration cost algorithm is compiled into jar package by MATLAB software,which is integrated into the developed system module,and the effectiveness of the algorithm is verified on the system,so as to further verify the practicability of this study.The research results of this paper can effectively solve the problem of frequent production change and reconfiguration of multiple mobile phone assembly lines in a production cycle,reduce the manufacturing cost of enterprises in a certain range,improve the core competitiveness of enterprise products,and promote the development of intelligent and flexible mobile phone semi-automatic reconfigurable assembly lines.