Robust Scheduling for Plural Lot Size Manufacturing

This paper describes a robust scheduling system for manufacturing processes. In this system, an adequate balance between large-lot and small-lot manufacturing can be achieved by a multi objective optimization technique, and the lead time for manufacturing large-lot products and appropriation rate for small-lot products can be improved in comparison with those used in traditional scheduling methods. In small-lot manufacturing, the change in setup time is considered by its static distribution, and thus, the productivity of small-lot products can be maximized. These effects of the robust scheduling system have been examined quantitatively by means of a numerical simulation.