Bullet tube expanding apparatus

Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools

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72478, B21D 3920

Patent

active

060166819

ABSTRACT:
An apparatus for expanding a tube 1 from a first diameter d.sub.1 to a second diameter d.sub.2 by passing a mandrel through a tube 1 includes a bullet assembly 3 comprising at least two co-operating bullet segments 5, 7, 9, Each of the bullet segments 5, 7, 9 has an outer surface 11 for contacting the inner surface of the tube and an inner surface 13 for contacting the inner surface of an adjacent bullet segment. The outer surface 11 of each segment is generally arcuate in radial cross-section and each segment has a body region 15 between a head 17 and tail region 19. The inner surfaces 13 of adjacent bullet segments 5, 7, 9 have co-operating tapered surfaces 21 shaped such that the bullet segments are movable axially with respect to one another such that the bullet assembly 3 may be in an expanded state or a collapsed state. The apparatus also includes a device 23 to axially slide the bullet segments one with respect to another so that as the bullet assembly is pushed into the tube, the bullet segments are in a collapsed state and as the bullet assembly 3 is pulled out of the tube the bullet segment are slid axially one with respect to another into their expanded state to expand the tube diameter from a first diameter to the second diameter d.sub.2.

REFERENCES:
patent: 3358492 (1967-12-01), Richter
patent: 3901063 (1975-08-01), Nileshwar
patent: 4262518 (1981-04-01), Creger et al.
patent: 5685066 (1997-11-01), Mohrmann et al.

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