| 摘要 |
PURPOSE:To obtain a sheet metal having no cracking surface characteristic and good thickness distribution by following rapid change for roll pushing force instantaneously by initial roll pushing screw and a shifting roll shaft. CONSTITUTION:By shifting a stopper 7 for an initial roll gap setting, the initial gap between the rolls is set, and the initial roll pushing screw is fastened as measuring the roll pushing force by a load measuring device 6, to shift to the prescribed initial pushing force. Next, at the time starting the casting, the spring is compressed by reducing as rolling solidified layer. Here, by making a spring constant of the spring 2 less than the initial roll pushing force, the change of pushing force according to the variation of the sheet thickness becomes to less, and so in case of which the thickness of the sheet metal 5 supposes to change rapidly, the rapid change of the pushing force is absorbed by the spring 2. In this way, the development of the surface cracking of the sheet metal is prevented. |
