FR-Based Scheduling Using the Independence Axiom for Shortening Lead-Time of Mold Manufacturing
Nakao, M., Iino, K., Kobayashi, Tokusei, Tanimoto, Yamada
3rd International Conference on Axiomatic Design, 2004
Mold manufacturing operators have to make a number of decisions for each product. For shortening lead-time of mold manufacturing, we applied axiomatic design, principally the Independence Axiom, to analysis and management of the decisions. At first, we set each human decision as a functional requirement (FR). Our proposed method, a rule of “one decision per one process” or a rule of “no feedback” in a “decision-based process design”, re-scheduled the processes (=DPs) to satisfy the Independence Axiom. For example, among the 583 decisions made for one-mold production, we removed those that the computer could settle, and further reduced the number of selections with the standardization. These improvements dropped the number of human decisions (=FRs) down to the minimum set of 77 independent ones. The less human decisions can reduce the thinking/ negotiating/ waiting time, shortening the lead-time by 14 %.
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