Combinatorial Optimization Method for Parts Matching in a Precision Assembly System Using Selective Assembly and Micro-Machining.

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  • 選択組立と微細加工を併用した高精度組立システムにおける部品の組合せ最適化手法
  • センタク クミタテ ト ビサイ カコウ オ ヘイヨウ シタ コウセイド クミタテ システム ニ オケル ブヒン ノ クミアワセ サイテキカ シュホウ

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Abstract

With selective assembly based on the combinatorial optimization method, a combination of parts is optimized so that high quality assembled units are obtained in a lot unit at the maximum assembly rate while dimensions of each part are referred to appropriately. The assembly method proposed in this study combines selective assembly based on a combinatorial optimization method with micro-machining so as to produce high precision assembled units. This method is applied to the high precision assembly system where hole parts are combined with shaft parts. Further, micro-machining used for the correction of the dimensions of the shaft parts is taken into consideration during the optimization of the parts combination, and it is attempted to verify the performance by simulation. This system is effective in a small lot production, where higher assembly rates can not be attained with conventional methods, in such that a higher rate is obtained if micro-machining is used alongside. With the combinatorial optimization method for parts where micro-machining is taken into consideration in advance, maximum micro-machining dimension and maximum machining time of the shaft parts can be greatly reduced and the number of assembled units close to the ideal state is increased.

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