US 10,058,934 B2Granted

Rotary cutting tool with honed edges

AssigneeKyocera Sgs Precision Tools, Inc.

InventorsJeffery L. Burton, Douglas P. Bonfiglio, Jacob Rak

Life of this patent

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Abstract

A rotary cutting tool includes a shaft having and outer surface and having a longitudinal axis, a plurality of helical flutes formed in the shaft about the longitudinal axis, a plurality of helical cutting edges formed at an interface with the outer surface and a respective helical flute about the longitudinal axis, and a plurality of end cutting edges located on an axial distal end of a cutting portion of the shaft, the end cutting edges being contiguous with a corresponding one of the plurality of helical cutting edges and forming a corner in the transition between each of the end cutting edges and the corresponding one of the plurality of helical cutting edges. A hone edge extends along a portion of each of the end cutting edges, the associated corner and a portion of the corresponding one of the plurality of helical cutting edges.

Claims6

Dependent claims

An end mill rotary cutting tool comprising:

a shaft having an outer surface and having a longitudinal axis, the shaft including a shank portion and cutting portion;
a helical flute formed in the shaft in the cutting portion about the longitudinal axis;
and
a helical cutting edge formed at an interface with the outer surface and the helical flute about the longitudinal axis;
and
an end cutting edge located on an axial distal end of the cutting portion of the shaft, the end cutting edge being contiguous with the helical cutting edge and forming a corner in a transition between the end cutting edge and the helical cutting edge;
where the helical cutting edge, the corner, and the end cutting edge form a contiguous hone edge extending a hone edge length and where the contiguous hone edge includes an edge radius, where the edge radius is variable along the hone edge length through the helical cutting edge, the corner, and the end cutting edge and where an axial angle and a radial angle of the contiguous hone edge are geometrically positive relative to rotating the shaft in a clock-wise rotational direction about the longitudinal axis.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/741,608Filed 17 Jun 2015 · us provisional application
Priority: 18 Jun 2014
Published: US 2015/0367427 A124 Dec 2015
Granted: 28 Aug 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23C 5/10
Characterised by the shape of the cutter: shank-type cutters, i.e. with an integral shaft
B24B 3/021
Of milling cutters: of milling cutters with helical cutting edges
B24B 3/06
Of milling cutters: of face or end milling cutters or cutter heads, e.g. of shank type
B23C 2210/0407
Angles: cutting angles