Patent ID: 7069760
Filing Date: 2006-07-04
Classification: B21C

Abstract:
1. A manufacturing device for a curved metal tube with an arbitrary section comprising: an extrusion punch having two or more punches for pressing two or more hot metal billets(B), the two or more punches moveable at different velocities; a container having a longitudinal axis, two or more holes for receiving each of the two or more hot metal billets, each of the holes being a different size, and an eccentric conical plug, extending from an end surface of the container, the plug being eccentric from the longitudinal axis of the container; and an eccentric conical extrusion bending die having an eccentric conical cavity with an opening, the conical cavity being eccentric from the longitudinal axis of the container, the eccentric conical cavity receiving the eccentric conical plug of the container, wherein the conical cavity defines an inner surface of the extrusion die, the opening of the conical cavity having a shape corresponding to the shape of the conical plug such that a gap is defined between the inner surface of the die and an outer surface of the conical plug, the gap having a width corresponding to the thickness of the curved metal tube, and wherein the inner surface of the extrusion die corresponds to the outer surface of the plug.