マハラノビス距離によるニアネットシェイプ鋳造モニタリングシステムに関する基礎的研究

抄録

The market continues to make increasing quality and cost demands of industrial products. To meet cost reduction demands for die-cast products, net-shape technology is now commonly used. As it is difficult to eliminate the cutting process entirely at the current state of the art, the focus is on how to minimize the amount of cutting; it is desirable that there should be minimal shape deformation after die-casting. In this study, to maintain die-cast conditions optimized to minimize deformation, a die-cast condition monitoring system using Mahalanobis distance is examined. First, the relation between the amount of deformation and temperature variation in the die-cast product was examined,and it was shown by analysis that the amount of deformation is smaller when there is less temperature variation. Then a unit space was set and the signal data were analyzed to demonstrate that the Mahalanobis distance monitoring system had effective features.