Ball end mill

Details Ball end mill Ball end mill

1988-09-21

1989-11-28

Olszewski, Robert P.

Cutters, for shaping

Rotary cutting tool

Including holder having seat for inserted tool

407 42, 407 48, 407 60, 407 62, B23B 2706

Patent

active

048833916

ABSTRACT:
A ball end mill includes a body, an indexable cutter insert and a clamp screw. The body has a recess formed in a forward end portion thereof and a bore formed therein and opening to a bottom face of the recess. The bore includes a cylindrical portion disposed adjacent the bottom face and an internally threaded portion greater in diameter than the internally threaded portion. The insert includes a front face, a rear face and at least two convexly curved side faces. The front face has at least two convexly curved main cutting edges each defined by the intersection of a respective one of the curved side faces with the front face. The insert has an aperture formed therethrough and extending generally perpendicular to the rear face. The insert is releasably mounted in the recess with the rear face held in contact with the bottom face in such a manner that one of the main cutting edges is indexed in a cutting position. The clamp screw includes an externally threaded portion and a cylindrical engaging portion disposed coaxially with the externally threaded portion and being greater in diameter than the threaded portion. The clamp screw passes through the aperture of the insert and is received by the bore in such a manner that the externally threaded portion is threaded into the internally threaded portion while the cylindrical engaging portion is held in engagement with the cylindrical portion.

REFERENCES:
patent: 4132493 (1979-01-01), Hosoi
patent: 4525110 (1985-06-01), Stajanvski
patent: 4527930 (1985-07-01), Harrom
patent: 4693641 (1987-09-01), Tsyumura

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