Planning,design And Order Scheduling Of Mobile Phone Assembly Line Under High-frequency Refactoring Situation

As a new generation of daily necessities,the demand for smartphones continues to be strong.As the last stage of mobile phone production,its assembly process has the following notable features:(1)High-frequency production changes.Due to the rapid change of mobile phone products,many models and different batches,mobile phone assembly requires frequent switching between different mobile phone products,and the average production change cycle is usually measured in hours.In order to meet this demand for production changes,enterprises need to reconfigure the assembly line frequently.(2)The delivery time is urgent.The competition in the mobile phone consumer market is extremely fierce,and customers have almost strict requirements on delivery time.Delayed orders will bring economic losses,customer loss and other chain effects to enterprises.(3)High-value commodities.The production capital cost of mobile phone products is high,the technical iteration cycle is short,and the value depreciates quickly.If the production enterprise fails to reasonably improve the production efficiency and accumulate a large number of parts and semi-finished products in a short period of time,it will cause huge capital flow to the brand side and the producer side.Stress or even loss.Therefore,the production orders of mobile phone products are constantly tending to have the characteristics of multiple varieties,small batches,and short delivery times,forcing manufacturers to upgrade their original production lines so that they can meet the needs of high-frequency production changes.This brings new challenges to manufacturers: it is necessary to find a reasonable method for resource allocation and design optimization of mobile phone assembly production lines to cope with the more and more frequent production changes and reconstruction needs.Based on the investigation of a typical mobile phone assembly company in the industry,this thesis studies the optimization of resource allocation,production line design,and order scheduling optimization of high-frequency replacement mobile phone assembly lines.The specific work content is as follows:(1)Based on the current typical production mode in the industry and its process operation design,the operation process sequence is analyzed,and the common features are abstracted and extracted,and the common process segments that are produced by different products are obtained.The characteristics of the high-frequency replacement mobile phone assembly line are discussed,and the problem of resource allocation considering the difference in personnel ability,the design problem of production line considering the variable personnel process,and the optimization problem of order scheduling at the input planning layer are described in detail,and A brief introduction to common solution methods;(2)Based on the characteristics of common process sections and processing units,a mobile phone assembly resource allocation path map was generated,and a mathematical model of resource allocation for mobile phone assembly lines with high-frequency production changes was established,taking into account the differences in personnel capabilities.Start by predicting the number of mobile phone orders demanded by the brand in the coming year,combined with the existing enterprise workshop work system,and input relevant data to solve the optimal resource allocation plan;(3)Continue the research based on the results of resource allocation.Considering the flexibility of personnel in the production line,two sets of production line design schemes are proposed,and considering the high flexibility characteristics of personnel,a reconfigurable production line design mathematical model is established.A particle swarm algorithm is proposed to solve the nonlinear integer programming problem,and the optimal number of processing resources allocated to each process section is obtained when the high-frequency mobile phone assembly line produces different products;(4)Based on the reconfigurable production line design scheme,the order scheduling optimization problem at the planning level is studied.Aiming at the high frequency production change characteristic of mobile phone assembly,a method to evaluate the production change degree of assembly line is proposed.A mathematical model of order scheduling optimization is established with the goal of minimizing time cost and inventory cost,and a branch-andbound method based on delivery feasible region,improved first-generation spin genetic algorithm and improved first-generation spin particle swarm optimization algorithm are proposed.It solves the problem and compares the performance of the algorithm.Finally,the branch and bound method is used to solve the specific problem,and the optimal plan for order scheduling is obtained.After planning,designing and scheduling the mobile phone assembly line,it can improve the system flexibility,shorten the reconstruction time,improve the production efficiency,make it adapt to the development trend of multi variety,small batch and short delivery time of mobile phone assembly orders,and better deal with the challenges brought by high-frequency production change and tight delivery time.