Drill for machining fiber reinforced composite material
A composite, fiber-reinforced technology used in tools for lathes, metalworking equipment, workpieces, etc.
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[0017] see Figure 1-5 , wherein like reference numerals represent like elements, a double flute, diamond-coated twist drill according to an embodiment of the present invention is indicated generally at 10 prior to cleaving. Preferably, the drill bit 10 is made of a tungsten carbide (WC) matrix having bonded cobalt (Co) in the range of about 3 wt.% to 10 wt.% and a thickness of between 3 μm and 20 μm A diamond coating in the range, which is deposited by chemical vapor deposition (CVD). The sharpening radius (or cutting edge radius) after coating is between about 5 microns and 30 microns.
[0018] Drill bit 10 has a shank 11, a longitudinal axis 12 and includes two flutes 14 and 16 with a helix angle 18 of between about 25 degrees and 35 degrees relative to longitudinal axis 12. A land width 24 is maintained between about 5% and 10% of the drill diameter 22 . A drill body void diameter 26 is maintained between about 92% and 96% of the drill bit diameter 22 . The core thickn...
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