Method for forming a hub disk and metal spinning roller for use in the forming of a hub disk

Method for forming a hub disk by using a roller, which comprises:

• placing a circular blank-line workpiece in a flow-forming machine and engaging said workpiece with at least one overarm support to secure the workpiece in place such that an area of the outer contour of the support is formed corresponding to an area of the inner contour of a hub to be formed, said flow-forming machine including a roller with a cutting edge moveable in a substantially radial direction so as to engage the workpiece and partly separate material of the workpiece,
• rotating the circular blank-line workpiece on said support,
• engaging said workpiece with said cutting edge so as to partly separate material of said workpiece,
• pressing with said roller the partly separated material against the overarm support so as to shape the hub,
• guiding the partly separated material from the cutting edge, during moving of the roller, to an adjacent compression area of the roller, an outer profile of the compression area being shaped in accordance with the outer contour of the hub to be formed,
• causing the partly separated material to flow axially along the compression area of the roller and be radially compressed, said roller having a projection positioned thereon,
• stopping the flow of the material which flows axially along the compression area of said projection of the roller, and
• forming a hub between the compression area, the projection and the overarm support.