Ball end mill

Details Ball end mill Ball end mill

1992-05-21

1993-02-23

Terrell, William E.

Cutters, for shaping

Rotary cutting tool

Including holder having seat for inserted tool

407 54, 407119, B23C 510, B23C 518, B23C 520

Patent

active

051884879

ABSTRACT:
A ball end mill is disclosed which includes a tool body having an axis of rotation therethrough and having a forward end portion, and a cutting edge provided on the forward end portion of the tool body and having an arcuate shape as viewed in a direction opposite to the direction of rotation of the tool body. The cutting edge is comprised of a radially inner portion disposed adjacent to the axis of rotation of the tool body and extending radially inwardly of the tool body in a direction opposite to the direction of rotation of the tool body, and a radially outer portion extending from the inner portion radially outwardly and axially rearwardly of the tool body. Each of the inner and outer portions of the cutting edge is formed of a two-layered composite sintered complex having a base layer of cemented carbide and an upper layer of sintered super hardened compact disposed on the base layer and containing cubic boron nitride, diamond or the like. The composite sintered complex defining the outer portion of the cutting edge is arranged such that the upper layer is directed in the direction of rotation of the tool body while the composite sintered complex defining the inner portion of the cutting edge is arranged such that the upper layer is directed forwardly of the tool body.

REFERENCES:
patent: 4222690 (1980-09-01), Hosoi
patent: 4437800 (1984-03-01), Araki et al.
patent: 4714385 (1987-12-01), Komanduri
patent: 4898499 (1990-02-01), Tsujimura et al.
patent: 4927303 (1990-05-01), Tsujimura et al.
patent: 4934881 (1990-06-01), Tsujimura et al.
patent: 4959929 (1990-10-01), Burnand et al.
patent: 5011515 (1991-04-01), Frushour

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