PURPOSE: To improve the thickness accuracy of a slab after rolling and to prevent the variation of rolling tension and breaking of sheet during rolling by joining the rear end part of a preceding slab and the tip part of the succeeding slab by heating/ pressurizing them, removing the rising part due to joining and also cooling the joined part and its periphery.
CONSTITUTION: The rear end part of the preceding slab 11 and the tip part of the slab which is rolled following the preceding slab are respectively held with clamps 13, 14 and 15, 16 and opposed with small gap spaced. By arranging a pair of induction heating coils 17 on both sides of these slabs and making flow high frequency current through the coils from a power supply 18, the rear end part of the preceding slab 11 and the tip part of the succeeding slab 12 are heated by induction. By pressurizing the preceding slab and succeeding slab during or after heating, joining is executed. The joined part rises due to pressurizing and fused material is pressed out. To remove these rising parts and fused material, a rising part removing device having rotary cutters is used. Further, after removing the rising part or the like, the vicinity of the rising part is cooled with a water spray cooling device.
AMAGASA TOSHIAKI
YAMADA HIROSUKE
NIKAIDO HIDEYUKI
ISOYAMA SHIGERU
HIRABAYASHI TAKESHI
KATSURA SHIGEFUMI
TASHIRO KATSUZO
ICHIKIZAKI TETSUO
MITSUBISHI HEAVY IND LTD
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