Z-mill

Sketch of a Z-mill

A Z-mill (Sendzimir mill) is a machine for rolling steel. Instead of using a single pair of rolls the Z-mill uses cascaded supporting rolls to apply force on the small work rolls in the center (red pair of rolls in the figure on the right). This allows the application of a higher roll pressure without bending the work rolls, which would result in poor metal quality. Thus very hard and elastic materials can be rolled.