Method of manufacturing flaring-processed metal pipe
AssigneeNippon Steel Corporation
InventorsKeinosuke Iguchi, Shohei Tamura, Masaaki Mizumura
Life of this patent
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Abstract
A method of manufacturing a flaring-processed metal pipe from a hollow shell including a plurality of portions having different deformation resistances in a circumferential direction is provided, the method includes: among the plurality of portions, specifying a portion having a relatively small deformation resistance as a low deformation resistance section, and a portion having a relatively large deformation resistance as a high deformation resistance section; and press-fitting a pipe expansion punch into the hollow shell such that a thickness reduction rate of the low deformation resistance section is smaller than a thickness reduction rate of the high deformation resistance section.
Claims16
A method of manufacturing a flaring-processed metal pipe having a pipe expanded section from a hollow shell including a plurality of portions having different deformation resistances when viewed in a circumferential direction, the method comprising:
- among the plurality of portions spaced in the circumferential direction, specifying one of the plurality of portions as a low deformation resistance section having a first deformation resistance, and another of the plurality of portions as a high deformation resistance section having a second deformation resistance, the second deformation resistance being greater than the first deformation resistance;
- and
- press-fitting a pipe expansion punch into the hollow shell and expanding the hollow shell, so that a thickness reduction rate of the low deformation resistance section is smaller than a thickness reduction rate of the high deformation resistance section.
Dependencies are inferred from the claim text.