Research On Production Planning And Control Of H Company Plate Branch Based On The Theory Of Constraints

The problem of production plan formulation and control has always been a long-term concern,research and discussion by production managers and scholars,because a scientific and rational production plan coupled with effective execution and control can help companies properly allocate personnel,equipment,resources such as materials and make the business run more efficiently.There are many factors affecting the formulation and control of production operation planning.This thesis only takes the production operation plan of H company’s plate factory as the research object,analyzes the problems in the process of formulation and control,and applies the theory of constraint in production operation planning and control.The superiority of the aspect to solve the problem of lack of production and control ability and lack of scientificity in production planning is of great practical significance for H company.Firstly,this thesis summarizes the basic ideas of theory of constraint and DBR production planning and control methods,introduces the related theories and methods of bottleneck resource identification,buffer type,location determination and size setting,and the principle and implementation of critical chain scheduling and relational matrix analysis step.Secondly,it introduces the method and process of H company’s production plan formulation,and analyzes and analyzesthe problems and causes in the process of formulating and implementing of the production plan of the plate factory,including the lack of scientific determination of the quantity standard and the strong randomness of the production plan formulation.The control during the execution of the production plan is severely weakened,the accuracy of market demand forecasting is not high,the number of inserts is too large,the production plan is adjusted frequently,the various production abnormalities affect the production system,and the randomness of production scheduling work,etc.These problems have brought more uncertainty to the production system.However,this article only discusses the scheduling and control issues of production operations.Then,this thesis combines the actual operation of the production planning of the plate factory,applies the theory and method of bottleneck identification and buffer setting based on theory of constraint,and finds the bottleneck process in the production system of the current plate factory-negative grid casting,identifies critical chains in production,determines the buffer type and buffer position of the bottleneck process,buffer size are calculated by using the buffer size calculation model,and the critical chain method is used to insert the import buffer and the project buffer in the critical link.Finally,it mainly analyzes and discusses the production planning and control problems of the plate factory.Applying the relational matrix analysis to analyze and discuss the optimization of the production operation plan of the bottleneck process-negative grid casting of the plate factory,finds the priority order of the specific machine operation,and the large-scale casting operation of the negative grid is sorted according to a plan of a certain period.However,the application of the relational matrix analysis is more suitable for the job scheduling of the specific machine.The production planning scheduling of the plate factory is more suitable for the critical chain scheduling based on the theory of constraint.In this thesis,the critical chain scheduling is used to schedule the production operation plan of the plate branch.The critical chain in the production schedule is found through the example,and the feeding buffer FB and the project buffer PB are set to shorten the production cycle.At the same time,compared with the current plan,the feasibility of the formulation method of the plan was verified.After the production schedule,the production process needs to be controlled.This thesis discusses the production process control method based on the theory of constraint with the critical chain,and gives the steps and methods of the production planning control of the polar plate factory.The work of the production dispatcher is given suggestions for improvement.