Cutters – for shaping – Rotary cutting tool – Face or end mill
Reexamination Certificate
2007-04-12
2008-10-07
Ashley, Boyer D. (Department: 3724)
Cutters, for shaping
Rotary cutting tool
Face or end mill
C407S054000
Reexamination Certificate
active
07431538
ABSTRACT:
A center or non-center cutting end mill for orbital drilling of fiber reinforced plastic (FRP) materials includes a shank, a neck, a cutting head and two or more flutes. The end mill has a tool geometry with the following features: a dish angle between about 2 degrees to about 6 degrees; a helix angle between about 5 degrees to about 18 degrees; an end teeth radial rake angle between about 0 degrees and about 15 degrees; a peripheral teeth radial rake angle between about 8 degrees and about 16 degrees; a gashing axial rake angle between about 3 degrees to about 10 degrees; and a primary clearance angle between about 10 degrees to about 18 degrees. The end mill is made from a tungsten carbide substrate with cemented cobalt in a range between about 3 to 10 wt. % and a diamond coating having a thickness in a range between about 8 to 20 μm.
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Chandler Jason W.
Ni Wangyang
Addisu Sara
Ashley Boyer D.
Kennametal Inc.
Meenan Larry R.
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