Patent ID: 6598443
Filing Date: 2003-07-29
Classification: B21D,B21H,F16H,Y10T

Abstract:
A method of forming a hub having a blind bore comprising the steps of:a) providing an annular disc having an initial thickness and a center hole therein; b) placing said disc on a head stock mandrel and spinning said disc; c) positioning a stepped mandrel in said center hole of said disc, said stepped mandrel having a smaller diameter portion extending through said hole and a larger diameter portion being positioned above an upper face of said disc; d) engaging an upper surface of said disc with a shaping roller and moving said shaping roller progressively radially inward from a position about halfway between an edge and the center hole of said disc along said upper face thereof, thereby displacing metal from said upper face as a first traveling annular wave toward the center hole of said disc and forcing metal into contact with said smaller diameter portion of said stepped mandrel, further forcing metal upward toward said larger diameter portion of said stepped mandrel, to provide an elevated surface above the plane of said upper face of said disc with a reduced diameter hole therein; e) backing off said shaping roller to a position proximate the edge of said disc and re-engaging said shaping roller against said upper surface of said disc, moving said shaping roller progressively radially inward to displace a portion of metal in the form of a second traveling annular wave while thinning said disc; and f) pressing said second annular wave against said larger diameter portion of said stepped mandrel to form a hub having a blind bore, said reduced diameter hole and said elevated surface respectively forming a bore opening and a blind bore face of said blind bore of said hub.