Internal gear manufacturing method and metallic glass internal gear manufactured thereby
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United States of America Patent
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Apr 16, 2013
Grant Date -
Dec 16, 2010
app pub date -
Nov 27, 2008
filing date -
Nov 27, 2007
priority date (Note) -
Expired
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Abstract
An internal gear manufacturing method capable of manufacturing time reduction and easy core removal, and a metallic glass internal gear manufactured thereby. A carbon core formed into a shape of an external gear is arranged in a thin, long tubular mold of a length equal thereto with a space extending longitudinally therealong. A molten metal material is pressure-injected under a temperature higher than a melting point thereof into the space between the mold and the core. The molten metal material is resolidified by rapid cooling at or above a critical cooling rate thereof together with the mold and the core. After resolidification of the molten metal material, the core is removed by pulverization or dissolution. Along internal gear formed of the resolidified metal material is cut into a plurality of segments of a prescribed length.
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