| 摘要 |
The device (1) comprises a holding die (4) intended to hold, in position inside the said tube (2), a floating mandrel (5) equipped with a grooved mandrel (6), a grooving unit (7) comprising a rotating cage (8) enclosing balls (9), so as to form a grooved tube (2R), and a finishing die (10), and the device is characterised in that: a) the said cage (8) consists of a bearing part (11), the internal profile (26) of which, in axial cross-section, comprises a circular arc (13), and of a flange (12) for closing the said cage; b) lubrication means. <IMAGE> |
