RISER ANALYSIS USING CASTING SIMULATION TECHNIQUES DURING SOLIDIFICATION

摘要

Riser sizing optimization is based on the analysis of riser operation. Casting solidification simulation software allows this analysis to be done without the consumption of materials, energy and labor. This paper presents a methodology to analyze riser operation to optimize riser size during metalcasting. This three-part paper includes: (1) establishing the test criteria during the riser operation analysis; (2) exemplification of the riser operation analysis by simulation, using a steel casting; and (3) experimental verification of the results. The findings suggest that the riser operation analysis must be based on solidification time maps (and not on the temperature maps at the end of solidification), on the time of interruption of communication between riser and casting and on the amount of the useful liquid alloy available in the riser until the casting solidifies. Our study shows that the solidification analysis must be undertaken on the basis of the real solidification modulus and not on the geometric solidification modulus.