An Integrated Model For Process Planning And Scheduling With Outsourcing In Manufacturing Supply Chain

Abstract

For years, researchers have mainly investigated the various processes within manufacturing supply chain individually. Recently, however, there has been increasing attention placed on the integrated model of manufacturing supply chain planning. An integrated process planning and scheduling model considering outsourcing in manufacturing supply chain is proposed in this paper. The process planning and scheduling considering outsourcing are actually interrelated and should be solved simultaneously. The proposed model considers the alternative process plans for job types, precedence constraints of job operations, due date of production, transportation time and production information for outsourcing. The integrated states include: (1) Operations sequencing, (2) Machine selection, (3) Scheduling with outsourcing under the due date. To solve the model, a heuristic approach based on genetic algorithm (GA) is developed. The proposed model minimizes the makespan considering outsourcing and shows the best operation-sequences and schedule of all jobs.