Ring-rolling machine and method for lifting and lowering the mandrel roll of a ring-rolling machine

A ring-rolling machine comprising a mandrel roll mounted in an upper and a lower mandrel roll bearing, and a related radial roll, wherein

• the upper mandrel roll bearing is configured as a fixed bearing,
• the fixed bearing has both a radial bearing and an axial bearing,
• the axial bearing encompasses a mandrel roll head of the mandrel roll and supports it at the bottom, and the axial bearing is configured so that it can be opened by way of opening means, and
• the upper mandrel roll bearing is disposed on a bearing body that is configured to be lifted and lowered, which body is guided by way of an operating guide that vertically guides the bearing body in a vertical operating region, and by way of a discharge guide that guides the bearing body in a vertical discharge region.