PURPOSE: To prevent uneven casting thicknesses and the break-out of an ingot shell by comparing the actual and standard temp. patterns of roll surfaces, detecting the deviation therebetween and controlling the rotating speed of the rolls and the flow rate of cooling water.
CONSTITUTION: A deviation arises in the falling position of temp. when a gap is generated between the shell and the roll. An arithmetic processing part 17 calculates the deviation rate thereof and outputs the signal corresponding thereto to a rotation control part 18 and a flow rate control part 19 to decrease, for example, the rotating speed of the roll and to decrease the flow rate of the cooling water. An ill effect is exerted to the roll 1 if the flow rate of the cooling water is excessively decreased and therefore an upper limit is set in a temp. difference detecting part 24 in such a manner that the temp. difference between both pipings 9, 10 does not exceed the specified value. The quantity of the heat to be extracted from the shell is decreased and the thickness of the shell is decreased by controlling the temp. difference in the above-mentioned manner, by which the contact of the shell with the roll 1 surface is made easier and the generation of ruggedness and the uneven thicknesses of casting are prevented.
NISHIYAMA HISAYOSHI
NAGAI KUNIO
MORI KATSUICHI
SAKAGUCHI HARUO
SUEHIRO TERUYOSHI
| JPS561251A | 1981-01-08 |