Reliability Modeling and Rework Strategy Evaluation of Manufacturing System based on Stochastic-flow Network

In order to optimize the rework strategy of manufacturing system, improve the manufacturing system reliability and control the cost, a rework strategy evaluation method based on stochastic-flow network is proposed. Firstly, a stochastic-flow manufacturing network is established for the target manufacturing system, and the minimum processing capacity of each equipment in the system is determined according to the output constraints, and then the reliability of the manufacturing system is calculated. Secondly, the method of calculating the manufacturing cost of a single product is given, and the decision values of different rework strategies are calculated by considering the manufacturing system reliability and the manufacturing cost of a single product, and then the rework strategy is evaluated. Finally, the above rework decision method is applied to a certain type of slide valve manufacturing system of servo valve. The results show that the optimal rework strategy for the slide valve manufacturing system is to rework each work-in-process (WIP) at most twice.