| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cold rolling method which reduces the occurrence of edge cracking of a steel sheet added with notches in tandem cold rolling. <P>SOLUTION: The temperature of both edge parts in the width direction of the connection part between a preceding material and a following material is raised to the rage of 300 to 800°C by an induction heater 6, and residual strain caused by forming notches at the connection part through shear processing is recovered. Then, the temperature of both edge parts in the width direction of the connection part is cooled down to 100°C or less by coolant injected at the entry side of a cold tandem rolling mill 7, and cold rolling is performed. Thereby, the temperature difference between the center of a steel sheet and edge parts is decreased, and rolling of the steel sheet S is performed in the state that deformation resistance difference in the width direction of the steel sheet is reduced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
