It is very important for the Continuous Casting (C.C.) process to stabilize the operation and keep high quality of the slabs. An investigation has been made of a method for preventing surface defects of C.C. slabs generated in the mold. Generation rate of surface defects is dependent on the powder flow condition between the mold and slabs. The method is based on friction measurement which is made by observing the transfer characteristics of the omld oscillator. Several facts affecting the friction have been found as follows:
(1) The friction force changes depending on several conditions of C.C. operation, especially on the casting speed and on the mold oscillation frequency.
(2) Under the constant operating conditions mentioned above, fluctuations of the friction inform the dynamical behavior of the stability between the mold and slabs. The surface defects can be predicted by watching the level of the fluctuation.
(3) The estimation possibility of predicting a sticking type breakout can reach about 60% by this method.
Finally the system has been established to mesure the friction betwreen the mold and slabs dynamically, continuously and quantitatively.
