Thermal-state plate strip hot roller bending slitting roller, a hot roller bending slitting system, process and production line

The invention provides a thermal-state plate strip hot roller bending slitting roller, a hot roller bending slitting system, a process and a production line. The thermal-state plate strip hot roller bending slitting roller, the hot roller bending slitting system, the process and the production line are used for longitudinal slitting of thermal-state steel plates or strip steel. An upper pressing roller and a lower pressing roller which are correspondingly arranged are included, at least one recessing part is arranged on the lower pressing roller in the axis direction, a protruding part corresponding to the recessing part of the lower pressing roller is arranged on the upper pressing roller, and a roller knife ring is arranged on the protruding part at least. Through the recessing part andthe protruding part on the pressing rollers, the position, to be slit, on the plate strip is subjected to stretching extrusion, through the roller knife ring, thinning or cutting is carried out, and longitudinal slitting of t