B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 41/04 (2006.01) B21D 19/12 (2006.01) B21D 53/84 (2006.01)
Patent
CA 2256153
A method of reducing an end portion of a tube having an oval or elliptical cross-section with a radial x-axis longer than its radial y-axis perpendicular thereto, to an essentially circular cross-section, said method comprising feeding said end portion to a forming tool comprising a plurality of adjustable, segmented jaws having a cumulative inner surface defining a cavity having (a) an entry aperture defining an oval or elliptical cross-section with a radial x-axis longer than its radial y-axis perpendicular thereto, said aperture adapted to operably receive said end portion of said tube in surface abutment therewith; (b) an essentially circular cross-section operably of the same radial length as said radial y-axis of said tube inner portion of said cavity; and (c) an intermediate portion between said aperture and said inner portion defining a surface of reducing cross-section along said radial x-axis; and subjecting said end portion within said cavity to a sufficient force to effect reduction of said radial x-axis relative to said radial y-axis to produce said end portion having said essentially circular cross-section. The method provides for a unitary exhaust tube of leak-proof construction which provides a consistently tight fit with appended components.
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