Method for the chipless production of a rotationally symmetrical body from a circular sheet metal blank

A method for non-cutting production of a rotationally symmetrical body from a circular sheet metal blank, the method comprising:

• clamping the circular sheet metal blank in an axial direction only in a radial inner region of the circular sheet metal blank between an inner mandrel and an outer forepiece surrounding a central forepiece;
• in a first spinning process, forming the circular sheet metal blank into a pot-shaped preform only by spinning or flow-forming around the inner mandrel, wherein the circular sheet metal blank is held during the forming around the inner mandrel only by the outer forepiece;
• shaping the pot-shaped preform into a pot-shaped body by spinning or flow-forming around the inner mandrel;
• subsequently moving the central forepiece axially towards the inner mandrel to clamp the pot-shaped preform in a radially inner region of the pot-shaped preform against the inner mandrel by the central forepiece;
• moving the outer forepiece axially away from the inner mandrel and moving one or more spinning rollers radially inwards;
• and
• forming a hub-shaped projection protruding outward from a base of the pot-shaped body by spinning around the central forepiece.