18th ICPR paper: A NEW VALUE STREAM MAPPING APPROACH FOR COMPLEX PRODUCTION SYSTEMS
Résumé
In this paper an innovative framework to apply Value Stream Mapping to products with complex Bill of Materials is presented. Value Stream Mapping is one of the best tools to map a process and to identify its main criticalities. Unfortunately it can be effectively applied only to linear systems. When the manufacturing process is complex with flows merging together, Value Stream Mapping cannot be straightly used. Thus, the main objective of this work consists in the solution of this limitation so that lean production can be enhanced in complex systems too. The proposed approach is based on seven iterative steps and integrates Value Stream Mapping with other tools typical of industrial engineering. The basic idea is to execute a preliminary analysis to identify the “critical production path" using the Temporized Bill of Material. Then, improvements are made considering all possible sharing with others secondary paths, as possible constraints. Once the critical path has been optimized, a new one may become critical. Thus the analysis proceeds iteratively until the optimum is reached and the Work In Process level has decreased under a desired value. A case study taken from a real setting environment is finally presented to asses the validity of the methodology here proposed.
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