Abstract A process for preparing a pole piece having spiders bent in the axial direction for the rotor of a generator in which a slug is obtained from a round metal bar, said slug is upset to a disc-shaped member, said member is formed with a plurality of radially and outwardly extending spiders on the outer periphery of and a boss on one surface of said member, said spiders are tapered on one surface and an annular bending recess is formed in said one surface of the spiders, said spiders are bent at said annular bending recess until the outer surface of the spiders lie on a plane right angles to the plane of said member to provide a semiprocessed product, and said semiprocessed product is in succession subjected to coining and sizing steps to thereby provide a complete pole piece having spiders bent in the axial direction.
A process for preparing a pole piece for the rotor of a generator comprising the steps of cutting a slug having a predetermined volume of from a round metal bar of an indefinite length, of upsetting said slug to a disc-shaped member, of forming said member to provide a plurality of spiders extending radially and outwardly from the periphery of said member and a center boss on one major surface of the member, of forming said member to taper the opposite sides and one surface of said spiders, of bending of said spiders toward said boss until the nontapered surface of said spiders lie on a plane right angles to the plane of said member, of coining said member to remove any irregularity present on the member and of sizing said member to provide a complete pole piece for the rotor of a generator.
Claim 2
Dependent Claim
144 words
A process for preparing a pole piece for the rotor of a generator comprising the steps of cutting a slug having a predetermined volume of from a round metal bar of an indefinite length, of upsetting said slug to a disc-shaped member, of forming said member to provide a plurality of spiders extending radially and outwardly from the periphery of said member and a center boss on one major surface of the member, of forming said member to taper the opposite sides and one surface of said spiders, of bending of said spiders toward said boss until the nontapered surface of said spiders lie on a plane right angles to the plane of said member, of coining said member to remove any irregularity present on the member and of sizing said member to provide a complete pole piece for the rotor of a generator.