Method of manufacture for rotary cutting tool

Details Method of manufacture for rotary cutting tool Method of manufacture for rotary cutting tool

1994-08-15

1995-11-21

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Drill

761041, B21K 502

Patent

active

054676703

ABSTRACT:
A method is disclosed for CVD wear coating of carbide rotary cutting tools without jeopardizing the sharpness and utility of the cutting edges. Initially, the tool is finish ground on all surfaces but for the cutting edges and the trailing relief surfaces adjacent thereto, which are left rough ground and "high". Then the entire tool is CVD coated with a suitable material at a very high temperature. This provides a tough coating, but embrittles or decarburizes the cutting edges. Next, the relief surfaces are finish ground, which brings all surfaces to final specification, sharpens the cutting edges, and removes the brittle layers. While the CVD coating is removed just behind the cutting edge, the relief surfaces behind the cutting edges are not as needful of a wear coating as the rake surfaces ahead of the cutting edges.

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patent: 5201616 (1993-04-01), Alverio
patent: 5291812 (1994-03-01), Yen et al.

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