Tube expander and method

Details Tube expander and method Tube expander and method

1979-07-16

1981-04-21

Larson, Lowell A.

Metal deforming

By relatively receding work-engaging tool-faces

Embodying three or more tools

29727, B21D 4102

Patent

active

042625181

ABSTRACT:
A tube expander (10) for extrudably deforming tubes (12) into conformity with a flange (16) has a plurality of first and second forming members (28,30) circumferentially arranged on a mandrel (20). In an initial position, the forming members (28,30) are axially offset and radially retracted for ease of insertion into the bore (13) of the tube (12). After insertion, the mandrel (20) is partially withdrawn by an actuator (64) and by such action, the forming members (28,30) are brought together in an abutting, axially aligned, and radially expanded relationship such that workpiece-contacting surfaces (40,42) of the forming members (28,30) are brought into substantially continuous circumferential contact with the tube bore 13. The workpiece-contacting surfaces (40,42) are maintained in continuous circumferential contact with the tube bore 13 as the forming members (28,30) and the mandrel (20) are withdrawn from the tube end, thereby uniformly extruding the tube.

REFERENCES:
patent: 1719720 (1929-07-01), Olsen
patent: 2357123 (1944-08-01), Maxwell
patent: 2991674 (1961-07-01), Uhl
patent: 3225581 (1965-12-01), Hinderer
patent: 3260097 (1966-07-01), Hilton
patent: 3385087 (1968-05-01), Huth
patent: 3866457 (1975-02-01), Bagby
patent: 3888102 (1975-06-01), Nigido
patent: 4212186 (1980-07-01), Blatter

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