Fatigue life enhancement of noncircular openings
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 19, 1990
Grant Date -
N/A
app pub date -
Feb 16, 1989
filing date -
Feb 16, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available