Ball end mill cutter

Details Ball end mill cutter Ball end mill cutter

1986-07-15

1987-12-15

Godici, Nicholas P.

Cutters, for shaping

Rotary cutting tool

Including holder having seat for inserted tool

407 54, 407 63, 408230, B23C 502, B23C 510

Patent

active

047129484

ABSTRACT:
A ball end mill cutter comprises a mill body and a shank portion. The mill body comprises a tapered or non-tapered reference cylindrical surface, a reference semi-spherical surface on the end of the latter and cutting edges continuing between the reference cylindrical and semi-spherical surfaces. A random point on the cutting edges on the reference semi-spherical surface is expressed:
When a reference latitudinal plane defines the junction of the reference cylindrical and semi-spherical surfaces, a Serial reference longitudinal (meridian) plane intersects the reference latitudinal plane; a latitudinal angle .gamma. lies between the reference latitudinal plane and a radius line drawn to the reference semi-spherical surface; a helical angle .alpha. lies between a tangential line of a helical cutting edge and the reference longitudinal plane; a longitudinal angle .beta. lies between a longitudinal plane, connecting the central axis of the cutter to a random point of the tip of helical cutting edge on the reference semi-spherical surface, and the reference longitudinal plane; .alpha.p is a random value of a latitudinal angle in the range of 65.degree. to 90.degree.; F(.alpha.) is a function producing a desired smooth line with respect to the latitudinal angle .alpha.; and F'(.alpha.) is a differential of the function F (.alpha.); then in the range 0.ltoreq..alpha..ltoreq..alpha.p

REFERENCES:
patent: 2113178 (1938-04-01), Gase
patent: 2413989 (1947-01-01), Molner et al.
patent: 3409965 (1968-11-01), Fisher
patent: 3696484 (1972-10-01), Spriggs

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