Spiral end mill and method of manufacturing the same

Details Spiral end mill and method of manufacturing the same Spiral end mill and method of manufacturing the same

1996-04-02

1998-03-10

Bishop, Steven C.

Cutters, for shaping

Rotary cutting tool

Face or end mill

407 63, 407118, B23C 510

Patent

active

057253331

ABSTRACT:
A spiral end mill which can mill a substantially sharp inside corner of a work surface and attain a stable working accuracy for a long time. The spiral end mill has a hard sintered compact insert portion, a negative relief face a first circular land provided along the outer periphery of the insert portion, and a second circular land on the negative relief face so as to be continuous with the first circular land. The widths of the two circular lands may be the same as or different from each other, and the helix angle of a back line of the second circular land is less than that of the first circular land. A method of manufacturing the spiral end mill involves machining a relief angle in the outer periphery of the insert portion while changing the helix angle between the negative relief face and the rest of the outer periphery.

REFERENCES:
patent: 5049009 (1991-09-01), Beck et al.
patent: 5226760 (1993-07-01), Nishimura

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