日本機械学会論文集
Online ISSN : 2187-9761
ISSN-L : 2187-9761
“つながる”新しい生産システムを目指して
精密板金加工のスケジューリング問題のためのハイブリッド解法
阪口 龍彦田中 達也清水 良明内山 直樹
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ジャーナル フリー

2017 年 83 巻 848 号 p. 16-00333

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In recent years, manufacturing industries are required to provide various kinds of products in a short time while reducing burden on the environment. To achieve such requirement, optimization techniques incorporated with ICT are attracting a rising attention. In sheet metal processing, reducing wastes of material and managing production schedule are considered to be very important for the efficient manufacturing. To work with these problems, we attempt to simultaneously minimize wastes of material and total tardiness through nesting and scheduling. The nesting and scheduling in sheet metal processing are affected with each other and there occurs certain conflicts in their decisions. For entire efficiency of manufacturing activities, therefore, they should be decided through managing trade-off between them. Under such understanding, in our previous study, we proposed an integrated method of nesting and scheduling. This method determines a schedule under the condition that the operational sequence of punching process as the first process of sheet metal processing is fixed. In order to realize more efficient manufacturing, in this paper, we have included the punching process in our consideration. Then, this study has proposed a hybrid heuristic approach to the scheduling problem of sheet metal processing. Genetic algorithm, dispatching rule and local search technique are applied to create a schedule together with a bottom left algorithm for nesting. Finally, in order to validate the effectiveness of the proposed method, we implemented prototype of nesting scheduling system and carried out a few computational experiments.

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