US 6,742,971 B2 · Cutting insert

Abstract

A metal cutting insert having a pair of cutting portions disposed on either side of a shank portion. Each cutting portion includes a forward cutting edge and two side cutting edges. Each side cutting edge forms part of a shelf that includes chip controlling/breaking structure and is defined by the juncture of a cutting surface with an upper boundary of a side face. The chip controlling structure includes a chip deflecting surface located adjacent the side cutting surface that includes a plurality of concave recesses that generate localized stiffening of a chip as it moves along the chip deflecting surface. Chip controlling structure located adjacent the forward cutting edge includes a downwardly sloping surface that forms part of a channel which extends from the forward cutting edge towards a shank portion of the insert. A pair of ridges located on either side of the channel rise upwardly and reach a height that is above the plane of the forward cutting edge. The width of the channel decreases in width for a portion of its extent. Radiused corner surfaces are provided which are especially effective as chip controlling surfaces during shallow turning operations.

Claims23

Dependent claims

A metal cutting insert having a forward face and spaced apart side faces, an upper boundary of said forward face joining a forward cutting surface, the juncture of the forward cutting surface and said forward face defining a forward cutting edge, each of said side faces having an upper boundary joining a side cutting surface the juncture of a side face and an associated side face upper boundary defining a side cutting edge, each side cutting edge forming part of a shelf that includes a chip controlling structure including a concave chip deflecting surface positioned immediately adjacent said cutting surface, the width of said concave chip deflecting surface increasing in a direction away from said front cutting edge and said chip controlling structure including a plurality of spaced apart, concave recesses spaced along said concave chip deflecting surface, with each recess increasing in size in a direction away from said forward cutting edge and a portion of said concave chip deflecting surface extending between each of the concave recesses.

A metal cutting insert comprising:

a) a pair of cutting portions disposed on either side of a shank portion;
b) clamping structure engageable by a cutting insert holder by which said metal cutting insert is held in an operative position at which one of said cutting portions is located in an operative position with respect to a rotating workpiece;
c) at least one of said cutting portions including forward cutting structure comprising:
i) a forward cutting edge for performing cutting operations on a rotating workpiece in a radial direction with respect to the axis of rotation of said workpiece;
ii) a downwardly sloping surface adjacent said forward cutting edge and centrally located, said sloping surface forming part of a channel which extends from the forward cutting edge towards the shank portion;
iii) a pair of ridges located on either side of said channel, said ridges rising upwardly and reaching a height that is above a plane of said forward cutting edge;
iv) the width of said channel decreasing in width for a portion of its extent, said upwardly rising ridges in cooperation with said channel generating localized stiffening of a chip as it proceeds along said ridges;
d) a side shelf defined on one side of said cutting portion, comprising:
i) a side cutting edge for performing cutting operations on a rotating workpiece as said cutting insert is moved in an axial direction with respect to said rotating workpiece;
ii) said cutting edge defined by an upper boundary of a side face defined by said cutting portion;
iii) said shelf further defining chip controlling structure including a concave chip deflecting surface positioned adjacent said side cutting edge and including a downwardly sloping portion that transitions into an upwardly sloping portion that joins one of said ridges;
iv) said concave chip deflecting surface including a plurality of spaced apart, concave recesses that are spaced along said side cutting edge and a portion of said concave chip deflecting surface extending between each of the concave recesses;
and,
e) said side cutting edge and forward cutting edge located in a common plane.

11 more elements

Dependencies are inferred from the claim text.

Cutting insert

Life of this patent

Cutting insert

Life of this patent

Abstract

Claims23