B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/113
B21D 5/14 (2006.01) B21D 39/02 (2006.01) B21D 53/16 (2006.01)
Patent
CA 1249915
ABSTRACT OF THE DISCLOSURE A method of production of a cylindrical body from a sheet of steel formed at opposite sides with projections and cutouts complementary to each other. The method comprises the steps of rolling the sheet of steel and inserting the projections in the cutouts to provide a cylindrical blank, and compressing at least one of inner and outer peripheral surfaces of the cylindrical blank in a radial direction to reduce the thickness of the cylindrical blank and to stretch a portion of the cylindrical blank in an axial direction whereby the projections inserted in the cutouts can be brought into intimate contact with each other at jointed portions.
456893
Kikuchi Rokuro
Kobayashi Hidemitsu
Nagasawa Hiroyuki
Tani Tatsuhiro
Tomite Tosio
Hitachi Ltd.
Kirby Eades Gale Baker
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