Conical or cylindrical mandrel is used for rolling thin wall stainless pipe with a larger diameter. The rolls are arranged around the perimeter of the pipe at an equal distance from each other. Each cycle reduces the thickness of the wall of the workpiece. The metal that is displaced, is to increase the diameter and length of pipe. Depending on the nature of the deformity, the process is called a roller extension pipe, or by rolling with a hood.
The basic principle of this method of rolling is a rotational extrusion under the action of axial force that is applied to the pipe. In addition to the axial displacement of the rolls of the mill also rotate the workpiece. The rotation may be attached to the workpiece and the mandrel. At cold transverse rolling axis of the rolls and the pipes are arranged in one plane. The minimum possible offset of the rolls when changing the feed angle. Another factor that influences the offset of the rolls, this axial pulling force arising in the use of drive rolls. Pulling force makes the rolling process is continuous. When the transverse rolling as blanks on the mill come rolled, forged, welded or stamped sheet glasses.
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