Method of densifying powder metal preforms
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United States of America Patent
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Jan 25, 2000
Grant Date -
N/A
app pub date -
Feb 17, 1999
filing date -
Feb 17, 1999
priority date (Note) -
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Abstract
A method of densifying the wall of an opening in a powder metal preform includes forcibly extending a densification tool through the opening having a plurality of radially enlarged forming portions arranged in axially spaced succession from smallest to largest which act to enlarge and densify the preform material and impart beneficial compressive stresses. The space between successive forming portions enables the preform material to recover elastically between adjacent forming sections to maximize induced compressive stresses.
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