B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
153/15
B21D 9/12 (2006.01)
Patent
CA 1305028
ABSTRACT A process for making a tube bend comprises forming a straight tube of quasi-elliptical cross section with the portion of the tube wall on one side of the major axis of the quasi-elliptical cross section made of a non-constant thickness which is a maximum at the point where the Minor axis of the quasi ellipse meets the tube wall on one side of the major axis of the quasi ellipse, applying against the portion of the inner surface of the tube wall on the other side of said major axis radially directed expansion and bending forces of a magnitude sufficient to displace that portion of the tube wall away from said major axis to a position in which the tube has the required internal dimensions and shape of cross section and curvature of the bend to be formed. Apparatus for performing the process includes a tube compressing die formed with an oblique passage and a curved expanding mandrel for expanding and bending the compressed tube.
544276
Ferguson James M.
Fetherstonhaugh & Co.
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