Study of Cost Estimation Method for Casting Industries. 1st Report, The Complicated Degree of Casting Products.

The cost of casting products consists of material cost and molding cost. Up to this time, the inconsistency has been pointed out that the pricing of casting products is based on the weight of casting products. If the weight of casting products which use cores equals that which does not use cores, the shape of casting products which use the core is more complicated than that which does not use cores. In the case of an automatic molding machine, timely supply of appropriate core to the machine side is requireds. It is supposed that the core making time depends on the complicated degrees and numbers of cores. This paper analysed the relations between the data from the drawing and the data of core making time, and discussed the cost estimation methods for casting industries.