| 摘要 |
A method of making-up a fitting having a deformable insert adapted to be disposed coaxially within a tube end. The insert is expanded by a punch having spaced annular swaging portions of progressively increasing diameter whereby successive enlarging operations are effected as a result of an axial movement of the punch through the insert. The punch includes a shaft with the annular swaging portions being formed integrally with the shaft. The enlarging portions may be uniformly axially spaced to assure the action of only a single swaging portion on the insert at a given time.
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