Powder metallurgy processes – Forming articles by uniting randomly associated metal particles – Consolidation of powders
Reexamination Certificate
2007-05-31
2010-11-09
King, Roy (Department: 1793)
Powder metallurgy processes
Forming articles by uniting randomly associated metal particles
Consolidation of powders
C419S005000, C075S770000, C425S078000
Reexamination Certificate
active
07829015
ABSTRACT:
An apparatus and process for forming compacted powder metal parts having a non-axial undercut feature. An undercut die is located between the upper and the lower dies and contains a plurality of shaped punches aligned in a circular pattern. Each of the shaped punches contains a working edge. The working edges converge to form an inner circumference which creates the undercut feature. The edges of the shaped punches slide with respect to each other to change the size of the inner circumference from a maximum diameter position to a minimum diameter position. During compaction, the rotation of the shaped punches alters the inner circumference to its minimum diameter position thereby forming an undercut in the final compacted part. The retraction of the shaped punches to its maximum diameter position enables the unimpeded removal of the part from the tool set.
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PCT Search Report; PCT/US2008/064935; Oct. 22, 2008, 9 pages.
Crump Matthew W.
Kuplen Sean T.
Sarick John D.
Borg-Warner Inc.
Brown & Michaels PC
Kessler Christopher
King Roy
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