Pipe, die, and method for manufacturing pipe
AssigneeSanoh Industrial Co., Ltd.
InventorsNorio KOBAYASHI, Kazuhiko NAKAZATO
Life of this patent
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Abstract
A metal pipe including a curved portion produced by bending in which a plurality of non-bending surfaces and a plurality of bent portions at which the non-bending surfaces are connected in a bending manner are provided on a circumferential surface on an inside being a curvature center side of the curved portion. With this pipe, a good appearance can be maintained, and stagnation and resistance of a flow of a fluid can be reduced on the inner surface side of the pipe where the fluid flows.
Claims15
A metal pipe including a curved portion produced by bending, wherein
- a plurality of non-bending surfaces and a plurality of bent portions at which the non-bending surfaces are connected in a bending manner are provided on a circumferential surface on an inside being a curvature center side of the curved portion.
A metal pipe including a curved portion formed by curving an unprocessed pipe along a die for bending processing, wherein
- the unprocessed pipe is curved while being bent at circular arc-shaped apices provided in the die so that a plurality of bent portions corresponding to the apices and a plurality of non-bending surfaces connected in a bending manner at the bent portions are formed on a circumferential surface on an inside being a curvature center side of the curved portion.
A die used to apply bending processing to an unprocessed pipe to form a metal pipe including a curved portion, the die comprising a die groove configured to guide the bending of the unprocessed pipe, wherein
- the die groove includes a plurality of circular arc-shaped apices configured to abut on the unprocessed pipe to form a plurality of bent portions when the bending processing is performed.
A pipe manufacturing method for manufacturing a metal pipe including a curved portion formed by curving an unprocessed pipe along a die for bending processing, the method comprising the step of curving while bending the unprocessed pipe at circular arc-shaped apices provided in the die so as to form a plurality of bent portions corresponding to the apices and a plurality of non-bending surfaces connected in a bending manner at the bent portions on a circumferential surface on an inside being a curvature center side of the curved portion.
Dependencies are inferred from the claim text.