2000 Volume 40 Issue 6 Pages 601-608
High productivity and high quality slab machine have been recently required in continuous casting process to lower the cost of steel production. It is important to know the inflow behavior of mold powder between mold and solidified shell to develop higher-speed casting. The purpose in this study is to make clear the mechanism of lubrication between mold and solidified shell. Sn–5mass%Pb alloy and stearic acid were used as substituted of liquid steel and molten mold powder in the experiment simulated continuous casting machine. Direct observation on inflow behavior of mold powder was made experimentally by a digital video camera. The friction force between mold and solidified shell was measured by a load cell which was set under the mold. Mold powder flowed into the aperture between mold and solidified shell during both positives trip time period and negative strip time period and the amount of powder consumption in positive strip time period was more than that in negative strip time period. The friction force between mold and solidified shell decreased when positive strip time ratio increased. When the modification rate or amplitude increased, or when frequency or casting speed decreased, the friction force decreased. These inclinations corresponded with those in the industrial continuous casting machine qualitatively.