Looking at recent applications of aluminum die castings, automotive parts account for about 90% of the production volume. Application to parts with high functional requirements, such as automobile undercarriage and body parts, is increasing. However, there are few reports published in Japan on the application of quality engineering to the casting field. There are still unclear points regarding the reduction of internal defects that improve casting quality. In addition, there are no examples of systematic research on casting conditions for stabilization of casting quality with respect to the three elements of productivity indices: high quality(Q),cost reduction(C),and high productivity(D).Therefore ,in this study ,an ideal function was set up using casting weight as a characteristic value ,which can be easily measured .We propose the application of a function evaluation method to evaluate the characteristic value of casting condition that affects casting weight.
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