鋳鉄鋳物工場の鋳物不良原因解析におけるコンピュータ利用の試み

抄録

  The development of automation in foundries at present is outstanding especially in the casting lines including molding and pouring. On the other hand, while the suppression of casting defects is the most important concern in a foundry, the analysis of these defects is dependent upon the experience of the metallurgical engineers and technical consultants in casting. Therefore, if there is a large quantity of defective castings, large man-hours of work must be expended to investigate the cause of the defects.
  With a view to speeding up and getting accuracies in the analysis of casting defects, a computer analysis was applied in a foundry. At first, more than two hundred factors which were thought to be the cause of casting defects were extracted from typical characteristic diagrams on various casting defects. After coding these factors, all data were stored in magnetic tapes. When a whole data on casting defects in one foundry were summarized and analyzed, the main cause was analyzed and extracted from the factors' file, utilizing probability number value showing the probability of the cause of each casting defect.
  A practical application of the analysis in a commercial foundry for a period of eleven months has certified the practicability of the author's method usiug probability number and detect point. Also the results obtained showed good coincidence with the opinion of technical consultants on the principal causes of casting defects in the foundry.