Drill and reamer for composite material

Details Drill and reamer for composite material Drill and reamer for composite material

1993-11-23

1994-10-11

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool having crystalline cutting edge

451259, 408224, 408228, B23B 5100

Patent

active

053541553

ABSTRACT:
A diamond coated drill bit capable of drilling small holes and then reaming the holes to their correct size. The tapered tip of the drill bit has a coarse diamond grit coating which enables it to initiate a hole. The drill bit then gradually grinds the hole to the proper size with a grinder having coarse diamond grit bonded to its surface which is at a predetermined taper. The final diameter of the hole is controlled by using a fine grit diamond reamer above the tapered grinder portion. The grinder applies a radial load to the composite material resulting in no fiber breakout or splintering. The tapered grinder and the reamer are formed on a machined-flat portion of the drill bit which enables coolant to circulate down to the grinding area and allows the easy removal of debris.

REFERENCES:
patent: 2732869 (1956-01-01), Stearns
patent: 4274769 (1981-06-01), Multakh
patent: 4480952 (1984-11-01), Jeremias
patent: 4720218 (1988-01-01), DeFries et al.
patent: 5000630 (1991-03-01), Riley et al.

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