Annular composite workpieces and a cold-rolling method for producing said workpieces

A cold rolling method for producing an annular composite workpiece, the method comprising the steps of:

• inserting a first hollow cylindrical workpiece into a second hollow cylindrical workpiece, wherein the first and second hollow cylindrical workpieces have radial play relative to one another when inserted into one another and are made of different materials;
• axial roll forming a composite workpiece of the first and second hollow cylindrical workpieces by pressing the first and second hollow cylindrical workpieces against each other between two diametrically opposed rotating outer roll forming tools and a rotating inner rolling arbor or between two diametrically opposed rotating outer roll forming tools and a rotating inner roll forming tool, wherein the two diametrically opposed outer roll forming tools are profiled to produce an outer profile on the composite workpiece, wherein the two diametrically opposed outer roll forming tools are radially advanced and apply radial pressure in inward radial direction and press together surfaces of the first and second hollow cylindrical workpieces, which surfaces touch each other, at a pressure sufficient to effect a cold pressure weld between the first and second hollow cylindrical workpieces, wherein an axis of rotation of the inner rolling arbor or an axis of rotation of the inner roll forming tool and axes of rotation of the two diametrically opposed outer roll forming tools are arranged parallel to each other, respectively, for axial roll forming.