Device and method for manufacturing hot-rolled sheet steel and device and method for sheet thickness pressing used for the device and method

1. Technical Field of the Invention According to an apparatus and a method for manufacturing a hot-rolled steel plate, a roughing process for reducing a thickness of a continuously cast slab is performed to obtain a sheet bar, and a finishing rolling process for rolling the sheet bar is effected to produce a hot-rolled steel plate having a predetermined plate thickness. After cooling down, the hot-rolled steel plate is then wound. A pair of dies each of which has a tapered portion on an input side and a parallel portion on an output side are used in at least part of the roughing process. Further, before performing plate thickness pressing to a material in a plate thickness direction by using the dies , at least one of a front end and a rear end of the material is pressed in a widthwise direction to be pre-formed.