Patent ID: 8499607
Filing Date: 2013-08-06
Classification: B21C,B21D

Abstract:
1. A method of forming a pan with a pan base comprising parallel integral raised elongated rib features, the method comprising; extruding a billet along an axis of extrusion to form an extrudate, then cutting the extrudate in a direction perpendicular to the axis of extrusion to form one or more extruded workpieces, each workpiece comprising a rectangular, generally planar base with two opposing base sides being the lateral sides of the extruded workpiece and the other two rectangle sides being transverse to the direction of extrusion, the planar base being formed with a plurality of parallel ribs extending upwardly from a common surface of the base and extending from one transverse side of the base to its opposing side, the ribs being spaced from the lateral sides of the base; cutting rib portions from the transverse sides of the base to provide a preform for the shaping of opposing pan walls; and forming a pan by urging the pan preform against a die surface in a pan-shaped die cavity to form pan walls, with corner intersections, from the lateral sides of the base and from the transverse sides of the base from which rib material was removed.