Patent ID: 7251890
Filing Date: 2007-08-07
Classification: B21D,Y10T

Abstract:
1. A method for producing a motor vehicle wheel pan, comprising the steps of: cold-rolling a rectangular metal strip of a uniform thickness using conical rolls to form a semicircular ring, wherein the semicircular ring is a curved strip with an outer edge and an inner edge, a thickness of the curved strip at the outer edge of the curved strip is reduced by at least 20% relative to the uniform thickness of the metal strip, wherein the thickness of the curved strip decreases from the inner edge to the outer edge such that the thickness at the outer edge is less than the thickness at the inner edge, and a circumference of the semicircular ring extends in a range 130-310°; producing a conical hoop from the semicircular ring by circular bending of the semicircular ring into a closed ring to form the conical hoop shape and welding the ends together; and shaping the conical hoop to form a bottom of the wheel pan.