CVD diamond coated twist drills

Details CVD diamond coated twist drills CVD diamond coated twist drills

1990-07-18

1991-06-11

Howell, Danel W.

Cutting by use of rotating axially moving tool

Tool of specific diverse material

761086, 408145, 408227, B23B 5102

Patent

active

050228013

ABSTRACT:
The present invention is directed to a twist drill which is coated with a layer of CVD diamond and which has slots in its head which are filled with CVD diamond. The invention twist drill is made by forming slots in the head of the twist drill and then subjecting the slotted twist drill to a CVD diamond deposition process for coating said twist drill with a layer of CVD diamond and for filling said slots with CVD diamond. The performance of CVD diamond-coated twist drills does not depend on retaining the diamond film over most of the areas of the drill; but, rather, drill performance is dependent upon retaining a layer of diamond on the cutting edge of the drill. The diamond-filled slots in the head of the twist drill function as wear stops and additional cutting edges as the surrounding drill material is worn away during use.

REFERENCES:
patent: 4707384 (1987-11-01), Schachner et al.
patent: 4731296 (1988-03-01), Kikuchi et al.
patent: 4762445 (1988-08-01), Bunting et al.

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