Akademik Məlumat İdarəetmə Sistemi
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED, vol.251, pp.639-644, 2000 (Scopus)
In this research the effect of some process parameters on the filling behavior of ductile iron in plate patterns of expanded copolymer (EPS-PMMA) during vacuum assisted counter gravity casting was studied experimentally. Commercial model of the vacuum assisted counter gravity casting was designed and built in Citation Foam Casting Company, Columbiana, AL. Two different techniques were used to perform a vacuum assisted counter gravity casting. Thermometric measurements during casting indicate a significant difference in cooling rates for these castings. Porosity analyses were performed for the plate castings. The results indicate that the internal porosity is lower when new casting technique has been applied. The thermometric measurements and "cell-valued discretisation" method has been used to generate contour maps of the mold filling dynamics. The position of molten metal front is represented by isochronal lines plotted every 0.1 sec. A flow-solidification equation was modified for vacuum assisted counter gravity casting. Expressions for the liquid metal velocity and for the flow length in the plate pattern were proposed. A good agreement has been found between simulations and the experimental results.