Cutting insert and rotary cutting tool
AssigneeTungaloy Corporation
InventorsYuji Shinjo, Isamu Saito
Life of this patent
Estimating the term…
Abstract
A cutting insert includes a first end surface, a second end surface located opposite the first end surface and an axis extending so as to penetrate the first end surface and the second end surface. The insert includes two first cutting edges with a curve shape on a first end surface side and two second cutting edges with a curve shape on a second end surface side. Each of the first cutting edges is formed on an intersecting ridge portion between the first end surface and a corresponding side surface portion so as to curve on a plane orthogonal to the axis. Each of the second cutting edges is formed on an intersecting ridge portion between the second end surface and the corresponding side surface portion so as to curve on a plane orthogonal to the axis.
Claims23
A gear cutting insert comprising a first end surface and a second end surface which are located opposite each other and a peripheral side surface extending between the first end surface and the second end surface, the peripheral side surface comprising two opposing long side surface portions connected to two opposing short side surface portions, the cutting insert comprising an axis defined therein which extends so as to penetrate the first end surface and the second end surface, the cutting insert comprising:
- two first cutting edges with a curve shape in a top view of the cutting insert, one first cutting edge being formed so as to extend along an intersecting ridge portion between the first end surface and one long side surface portion of the two long side surface portions and in such a manner that the one long side surface portion functions as a rake face, the other first cutting edge being formed so as to extend along an intersecting ridge portion between the first end surface and the other long side surface portion of the two long side surface portions and in such a manner that the other long side surface portion functions as a rake face, each of the first cutting edges being formed on the intersecting ridge portion between the first end surface and an associated long side surface portion so as to curve in a direction orthogonal to the axis;
- and
- two second cutting edges with a curve shape in a bottom view of the cutting insert, one second cutting edge being formed so as to extend along an intersecting ridge portion between the second end surface and one long side surface portion of the two long side surface portions and in such a manner that the one long side surface portion functions as a rake face, the other second cutting edge being formed so as to extend along an intersecting ridge portion between the second end surface and the other long side surface portion of the two long side surface portions and in such a manner that the other long side surface portion functions as a rake face, each of the second cutting edges being formed on the intersecting ridge portion between the second end surface and an associated long side surface portion so as to curve in the direction orthogonal to the axis;
- wherein:
- in said top or bottom view, each of the cutting edges has either a protruding curve shape or a recessed curve shape, along its entire length;
- in a top view of the cutting insert, the cutting edges form the outermost portions of the long side surface portions, along their entire length;
- and
- each of the cutting edges lays on a plane that is orthogonal to the axis.
A gear cutting insert comprising:
- an upper surface and a lower surface which are located opposite each other;
- and
- a peripheral side surface extending between the upper and lower surfaces, the peripheral side surface comprising a first pair of opposing long side surface portions and a second pair of opposing short side surface portions, the second pair of opposing short side surface portions connecting to the first pair of opposing long side surface portions;
- an axis penetrating the upper and lower surfaces;
- two curved upper cutting edges extending on a plane orthogonal to the axis and being visible in a plan view of the upper surface, the two curved upper cutting edges including:
- a first curved upper cutting edge extending along an intersecting ridge portion between the upper surface and a first member of the first pair of long side surface portions such that said first member functions as a rake face for the first curved upper cutting edge;
- a second curved upper cutting edge extending along an intersecting ridge portion between the upper surface and a second member of the first pair of long side surface portion such that said second member functions as a rake face for the second curved upper cutting edge;
- two curved lower cutting edges extending on a plane orthogonal to the axis and being visible in a plan view of the lower surface, the two curved lower cutting edges including:
- a first curved lower cutting edge extending along an intersecting ridge portion between the lower surface and the first member of the first pair of long side surface portions such that said first member functions as a rake surface for the first curved lower cutting edge;
- and
- a second curved lower cutting edge extending along an intersecting ridge portion between the lower surface and the second member of the first pair of long side surface portions such that said second member functions as a rake surface for the second curved lower cutting edge;
- wherein:
- in said plan view of the upper or lower surface, each of the cutting edges has either a protruding curve shape or a recessed curve shape, along its entire length;
- in a top view of the cutting insert, the cutting edges form the outermost portions of the long side surface portions, along their entire length;
- and
- each of the cutting edges lays on a plane that is orthogonal to the axis.
A gear cutting insert comprising a first end surface and a second end surface which are located opposite each other and a peripheral side surface extending between the first end surface and the second end surface and comprising two side surface portions, the cutting insert comprising an axis defined therein which extends so as to penetrate the first end surface and the second end surface, the cutting insert comprising:
- two first cutting edges with a curve shape in a top view of the insert, one first cutting edge being formed so as to extend along an intersecting ridge portion between the first end surface and one side surface portion of the two side surface portions and in such a manner that the one side surface portion functions as a rake face, the other first cutting edge being formed so as to extend along an intersecting ridge portion between the first end surface and the other side surface portion of the two side surface portions and in such a manner that the other side surface portion functions as a rake face, each of the first cutting edges being formed on the intersecting ridge portion between the first end surface and an associated side surface portion so as to curve in a direction orthogonal to the axis;
- and
- two second cutting edges with a curve shape in a bottom view of the insert, one second cutting edge being formed so as to extend along an intersecting ridge portion between the second end surface and one side surface portion of the two side surface portions and in such a manner that the one side surface portion functions as a rake face, the other second cutting edge being formed so as to extend along an intersecting ridge portion between the second end surface and the other side surface portion of the two side surface portions and in such a manner that the other side surface portion functions as a rake face, each of the second cutting edges being formed on the intersecting ridge portion between the second end surface and an associated side surface portion so as to curve in the direction orthogonal to the axis;
- wherein:
- in said top or bottom view, each of the cutting edges has either a protruding curve shape or a recessed curve shape, along its entire length;
- in a top view of the cutting insert, the cutting edges form the outermost portions of the side surface portions, along their entire length;
- each of the cutting edges lays on a plane that is orthogonal to the axis;
- and
- each of the first cutting edges and the second cutting edges is formed so as to have either:
- (a) an involute curve shape;
- or
- (b) a curve shape formed by coupling a plurality of curve portions with different curvatures together.
Dependencies are inferred from the claim text.