Method of manufacturing flaring-processed metal pipe
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsKeinosuke IGUCHI, Shohei TAMURA, Masaaki MIZUMURA
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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.
Claims14
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, specifying a portion having a relatively small deformation resistance as a low deformation resistance section, and a portion having a relatively larger deformation resistance than that of the low deformation resistance section as a high deformation resistance section;
- and
- press-fitting a pipe expansion punch into the hollow shell and expanding the hollow shell,
- wherein in the press-fitting and the expanding, 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.