Gear wheels rolled from powder metal blanks
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United States of America Patent
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Mar 23, 1999
Issued Date -
N/A
app pub date -
Sep 4, 1997
filing date -
Oct 8, 1990
priority date (Note) -
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Abstract
A gear wheel is formed from a pressed and sintered powder metal blank in which the metal powder comprises an admixture of iron powder and at least one alloying addition and the gear wheel is surface hardened by applying densifying pressure only to the tooth root regions or only to the tooth flank regions in order to establish densification in the range of 90 to 100 per cent of full theoretical density to a depth of at least 380 and up to about 1,000 microns.
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