Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
2007-09-04
2007-09-04
Omgba, Essama (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S419200, C029S513000, C029S469500, C029S243500, C029S283500, C072S055000, C072S381000, C219S602000, C219S659000
Reexamination Certificate
active
10924499
ABSTRACT:
Electromagnetic (EMF) trimming, flanging and hemming steps are performed at a single workstation in a combined fixture designed to form a hemmed panel assembly, such as a vehicle closure panel. Two or more formed sheets, outer and inner panels, are positioned together for hemming. The panels are clamped and EMF coils are activated to provide EMF force to retain the panels and trim off excess addendum material from the outer panel. The coils are then activated to bend the trimmed edge upward against a flanging member and form a 90 degree flange. Flanging and trimming members are retracted and a coil member positions EMF hemming coils opposite the flange. The hemming coils are then activated and apply EMF force to bend the flange of the outer panel to a 180 degree angle, overlaying the edge of the inner panel and forming a panel assembly having a hemmed edge. Optionally, if needed, the flanging member is then lowered against the flange to assure flatness of the hem.
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General Motors Corporation
Omgba Essama
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