Powder metal forging and method and apparatus of manufacture
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United States of America Patent
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Feb 2, 2016
Grant Date -
Apr 8, 2010
app pub date -
Apr 1, 2008
filing date -
Apr 4, 2007
priority date (Note) -
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Abstract
A method of forming a powder metal forging, which includes the steps of providing a preform including a sintered powder metal composition; inserting the preform in at least one part of a die set having a top die and a bottom die, at least one of the top die and the bottom die defining a helical forge form therewithin; closing the die set wherein the top die is contacting the bottom die; and compressing the preform in the forge form using an upper punch including a core rod and a lower punch, the compressing step occurring after the closing step, the compressing step resulting in a formed part having a helical outer surface. The method and apparatus of the present invention is particularly advantageous when forming a powder metal forging helical outer surface and an inner contour such as a cylindrical inside diameter.
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