Fatigue life enhancement of noncircular openings

Details Fatigue life enhancement of noncircular openings Fatigue life enhancement of noncircular openings

1989-02-16

1990-06-19

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

72392, 72393, B21D 1908

Patent

active

049341707

ABSTRACT:
A noncircular opening is formed in a material. A mandrel or mandrel and expansion sleeve are used for coldworking a circular region of the noncircular opening, and for forcing a hard metal insert into coldworking contact with the material immediately bordering the remaining portion of the noncircular opening. An insert may be placed within a slot to form with a circular closed end of the slot a substantially circular opening. An expansion sleeve is placed in the opening and an expansion mandrel is pulled through it, or an expansion mandrel is used alone in the opening, to coldwork the circular region of the opening. An insert may be placed within an opening and then a mandrel moved through an expansion sleeve placed in a circular opening in the insert, or a mandrel alone may be moved through the opening, to radially expand the insert and coldwork the material bounding the noncircular opening.

REFERENCES:
patent: 428416 (1890-05-01), Riley
patent: 493108 (1893-03-01), McAusland
patent: 2401834 (1946-06-01), Liddicoat
patent: 3566662 (1971-03-01), Champoux
patent: 4554817 (1985-11-01), Dier

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