B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
205/10
B21D 22/00 (2006.01) B21C 23/14 (2006.01) B21K 1/76 (2006.01)
Patent
CA 1150670
ABSTRACT OF THE DISCLOSURE A tulip-shaped metal part such as a yoke component of a tri-port type constant velocity universal joint is manufactured by single-stage closed chamber extrusion of a solid cylindrical metal rod. The metal rod is inserted into two opposingly engaged dies to protrude into a space defined in the dies and is axially pressed against an impressed surface to cause gradual and conti- nuous cleavage of the rod into three branched portions, which are forced into three chambers arranged and shaped correspondingly to three petal-like arms of the tulip- shaped metal part. The branched portions of the metal material are extruded within the three chambers in directions parallel to the direction of the pressing force exerted on the metal rod, with continued application of a back pressure to the extruding portions of the metal material to shape the ends of the petal-like arms during the extrusion-process.
368636
Ishii Shoju
Koshimaru Hajime
Marks & Clerk
Nissan Motor Co. Ltd.
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