Scheduling for a Mold Die Production System in a Dynamic Environment. Effect of Dispatching Rule and Estimation of Due Date.

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  • 一括組立の金型生産に対するスケジューリング  ディスパッチングルールの影響と加工納期の推定
  • イッカツ クミタテ ノ カナガタ セイサン ニ タイスル スケジューリング ディスパッチングルール ノ エイキョウ ト カコウ ノウキ ノ スイテイ

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This paper addresses a scheduling problem of a mold die production system in which parts can be assembled after all parts composing a die are fabricated. First, we analyze effects of dispatching rules, which relate to due date, slack time, operation time and modified process due date, on a part makespan and a ratio (the makespan/the maximum total operation time of part in a die), and present the optimum rule which minimizes the makespan. Next, we consider a method for estimating due dates based on the mean and the standard deviation of the ratio. Finally, using the above method we make a schedule, and analyze effects of rules and estimated due dates on the tardiness of die. The results show that rules are classified into three groups. The rules modifying process due dates perform well in the makespan, while the rule ignoring due dates performs worst. Furthermore, the coefficient of due date, which reduces a percentage of tardy dies to a desired value, can be approximately estimated by the proposed method. The rules modifying process due dates yield a smaller tardiness, and the rules using process due dates yield a smaller maximum tardiness.



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