US 4,930,945 A · Insert rotary cutter

Abstract

An insert rotary cutter includes a cutter body having a forward end face and at least one first cutter insert releasably attached to the cutter body. The first cutter insert is of a generally triangular shape including a front face having three marginal ridges and three corner ridges. Each marginal ridge is comprised of first, second and third ridge portions. The insert has three main cutting edges each defined by a respective first ridge portion, three auxiliary cutting edges each defined by a respective third ridge portion, three corner cutting edges each defined by a respective corner ridge, and three relief cutting edges each defined by a respective second ridge portion. One of the corner cutting edges and the main and auxiliary cutting edges which intersect the corner cutting edge are indexed in active cutting position. The indexed main cutting edge extends generally axially from the body while the indexed auxiliary cutting edge extends slightly beyond the forward end face. The relief cutting edge which intersects the indexed auxiliary cutting edge being displaced rearwardly from the indexed auxiliary cutting edge.

Claims18

Dependent claims

An insert rotary shoulder cutter comprising:

(a) a cutter body having an axis of rotation therethrough and having a forward end face;
and
(b) at least one first cutter insert releasably attached to said cutter body, said first cutter insert being of a generally triangular shape including a front face having three marginal ridges and three corner ridges where adjacent marginal ridges intersect each other, each marginal ridge being comprised of first, second and third ridge portions disposed so that the second ridge portion is interposed between the first and third ridge portions, said first insert having three main cutting edges each defined by a respective first ridge portion, three auxiliary cutting edges each defined by a respective third ridge portion, three corner cutting edges each defined by a respective corner ridge, and three relief cutting edges each defined by a respective second ridge portion;
one of said corner cutting edges and the main and auxiliary cutting edges which intersect said one corner cutting edge being indexed in active cutting position, in such a manner that said indexed main cutting edge extends generally axially from said body while said indexed auxiliary cutting edge extends slightly beyond said forward end face, the relief cutting edge which intersects said indexed auxiliary cutting edge being displaced rearwardly with respect to said body from said indexed auxiliary cutting edge.

1 more element

An insert rotary cutter comprising:

(a) a cutter body having an axis of rotation therethrough and having a forward end face;
and
(b) at least one first cutter insert releasably attached to said cutter body, said first cutter insert being of a generally triangular shape including a front face having three marginal ridges and three corner ridges where adjacent marginal ridges intersect each other, each marginal ridge being comprised of first, second and third ridge portions disposed so that the second ridge portion is interposed between the first and third ridge portions, said first insert having three main cutting edges each defined by a respective first ridge portion, three auxiliary cutting edges each defined by a respective third ridge portion, three corner cutting edges each defined by a respective corner ridge, and three relief cutting edges each defined by a respective second ridge portion;
one of said corner cutting edges and the main and auxiliary cutting edges which intersect said one corner cutting edge being indexed in active cutting position, in such a manner that said indexed main cutting edge extends generally axially from said body while said indexed auxiliary cutting edge extends slightly beyond said forward end face, the relief cutting edge which intersects said indexed auxiliary cutting edge being displaced rearwardly with respect to said body from said indexed auxiliary cutting edge;
each relief cutting edge being comprised of a first edge portion intersecting a respective auxiliary cutting edge and a second edge portion intersecting a respective main cutting edge, said first edge portion sloping inwardly from the insert away from said respective auxiliary cutting edge while said second edge portion extends generally parallel to the auxiliary cutting edge which said each relief cutting edge intersects.

2 more elements

An insert rotary cutter further comprising:

(a) a cutter body having an axis of rotation therethrough and having a forward end face;
and
(b) a plurality of first cutter inserts releasably attached to said cutter body, each said first cutter insert being of a generally triangular shape including a front face having three marginal ridges and three corner ridges where adjacent marginal ridges intersect each other, each marginal ridge being comprised of first, second and third ridge portions disposed so that the second ridge portion is interposed between the first and third ridge portions, said first insert having three main cutting edges each defined by a respective first ridge portion, three auxiliary cutting edges each defined by a respective third ridge portion, three corner cutting edges each defined by a respective corner ridge, and three relief cutting edges each defined by a respective second ridge portion;
one of said corner cutting edges and the main and auxiliary cutting edges which intersect said one corner cutting edge being indexed in active cutting position, in such a manner that said indexed main cutting edge extends generally axially from said body while said indexed auxiliary cutting edge extends slightly beyond said forward end face, the relief cutting edge which intersects said indexed auxiliary cutting edge being displaced rearwardly with respect to said body from said indexed auxiliary cutting edge;
at least one wiper insert replacing some of said first cutter inserts said wiper insert including a front face having three marginal ridges and three corner ridges where adjacent marginal ridges intersect each other, each marginal ridge of said wiper insert being comprised of first and second ridge portions, said wiper insert having three main cutter edges each defined by a respective first ridge portion, three wiper cutting edges each defined by a respective second ridge portion, and three corner cutting edges each defined by a respective corner ridge, one of said corner cutting edges of said wiper insert and the main and wiper cutting edges which intersect said one corner cutting edge being indexed in active cutting portion, in such a manner that said indexed main cutting edge extends generally axially from said body while said indexed wiper cutting edge extends slightly beyond said forward end face;
and
a plurality of support members of an identical shape and size, said first and wiper inserts being received by respective said support members, said first and wiper inserts being dimensioned such that the indexed wiper cutting edge of said wiper insert is longer than the indexed auxiliary cutting edge of said first insert and is spaced forwardly from said body a distance therefrom.

4 more elements

Dependencies are inferred from the claim text.

Insert rotary cutter

Life of this patent

Insert rotary cutter

Life of this patent

Abstract

Claims18