ANALYSIS AND OPTIMIZATION OF THE TRANSIENT STAGE OF STOPPER-ROD POUR

摘要

Stopper-rod controlled pouring systems offer a simple, efficient method for metal delivery in high production cast lines. However, the raising of the rod from the nozzle creates a complex flow front that may result in air entrainment and oxide film creation that are detrimental to casting quality. Three primary factors that result in defect creation and compromise casting quality are: 1) metallostatic head pressure, 2) shape of the rod, and 3) the speed and height of its removal from the nozzle. Our present work aims to employ numerical modeling to enhance the understanding of this essentially transient flow. The model will then be applied to optimize the process and minimize the potential for such defects. Real time X-ray visualization will be used to validate the results.