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US 7,325,471 B2Granted
Toolholder and cutting insert for a toolholder assembly
AssigneeKennametal Inc.
InventorsTed R. Massa, David R. Siddle
Life of this patent
Estimating the term…
Abstract
A toolholder and cutting insert for a toolholder assembly wherein the cutting insert has a tapered shank which provides a resilient interference fit with a tapered section of a bore extending within the toolholder. Additionally, a rearwardly facing face on the cutting insert abuts with a forwardly facing surface on the toolholder to properly locate the cutting insert within the toolholder.
Claims33
A toolholder adapted to accept a cutting insert having a forward end, a tapered shank and a rearwardly facing face thereon with a passageway extending completely through the insert, wherein the toolholder comprises:
- a) a toolholder body;
- b) a bore extending rearwardly therein and having a central axis extending therethrough;
- c) a forwardly facing surface extending about the bore for abutment with the rearwardly facing face of the insert;
- d) wherein the bore has a tapered section which narrows inwardly as it extends from the forwardly facing surface and is dimensioned to radially expand and to provide a resilient interference fit with the shank when the forwardly facing surface is in abutment with the rearwardly facing face, and wherein the tapered section of the bore has one of the shapes from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle;
- e) a toolholder passageway extending beyond the bore and through the toolholder body along the central axis;
- f) a hold-down bolt engageable within the toolholder passageway, wherein the hold down bolt has a head larger than the insert passageway and a hold down bolt shank smaller than the insert passageway and the bolt head engages the forward end of and retains the cutting insert within the toolholder, and wherein the hold-down bolt is not part of the cutting insert;
- and
- g) wherein the tapered section of the bore includes longitudinally extending slots extending rearwardly from the forwardly facing surface of the toolholder adapted to receive matching projections extending from the cutting insert.
5 more elements
A cutting insert adapted to be mounted within a toolholder having a bore extending rearwardly therein and a forwardly facing surface thereon, wherein the insert comprises a cutting insert body having:
- a) a forward end with a cutting edge thereupon, wherein the cutting edge is defined about the periphery of the cutting insert body within a plane at the forward end, wherein the plane is oriented perpendicular to the central axis, and wherein the cutting edge is continuous about the periphery;
- b) a shank receivable in the bore, extending rearwardly from the forward end, and having a central axis extending therethrough;
- c) a rearwardly facing face between the forward end of the insert body and the shank of the insert body for abutment with the forwardly facing surface of the toolholder;
- d) wherein the shank has a tapered section dimensioned to radially expand and to provide a resilient interference fit with the bore when the rearwardly facing face of the insert body is in abutment with the forwardly facing surface of the toolholder, wherein the tapered shank narrows as it extends rearwardly, and wherein the shank has one of the shapes from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle;
- and
- e) a passageway extending completely through the insert body along the central axis to accommodate a hold-down bolt extending through the insert forward end for securing the cutting insert within the toolholder.
3 more elements
A cutting insert adapted to be mounted within a toolholder having a bore extending rearwardly therein and a forwardly facing surface extending about the bore, wherein the insert comprises a cutting insert body having:
- a) a forward end with a cutting edge thereupon, wherein the cutting edge is defined about the periphery of the cutting insert body within a plane at the forward end, wherein the plane is oriented perpendicular to the central axis, and wherein the cutting edge is continuous about the periphery;
- b) a shank receivable in the bore, extending rearwardly from a forward end of the insert body, and having a central axis extending therethrough, wherein the shank has a conical section that is tapered and narrows as the shank extends rearwardly, and wherein the shank has one of the shapes from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle;
- c) a rearwardly facing face generally perpendicular to the central axis and located between the forward end of the insert body and the shank of the insert body;
- and
- d) a passageway extending completely through the insert body along the central axis to accommodate a hold-down bolt extending through the insert forward end for securing the cutting insert within the toolholder.
2 more elements
A toolholder system comprising:
- a) a toolholder body having:
- 1) a toolholder bore extending rearwardly therein and having a central axis extending therethrough;
- 2) a forwardly facing surface extending about the bore;
- and
- 3) a passageway extending beyond the bore and through the toolholder body along the central axis;
- b) a cutting insert body having:
- 1) a forward end with a cutting edge thereupon, wherein the cutting edge is defined about the periphery of the cutting insert body within a plane at the forward end, wherein the plane is oriented perpendicular to the central axis, and wherein the cutting edge is continuous about the periphery;
- 2) an insert shank extending rearwardly from the forward end and having a central axis extending therethrough;
- 3) a rearwardly facing face between the forward end of the insert and the shank of the insert;
- and
- 4) a passageway extending completely through the insert body along the central axis extending through the insert forward end for securing the cutting insert within the toolholder;
- c) wherein the forwardly facing surface of the toolholder is in contact with the rearwardly facing face of the insert;
- d) wherein the toolholder bore has a tapered section and the shank has a slightly mismatched taper, wherein each is dimensioned to radially expand and to provide a resilient interference fit with each other when the forwardly facing surface of the toolholder is in abutment with the rearwardly facing face of the insert, wherein the tapered section of the bore has one of the shapes from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle, and wherein the shank has the same one of the shapes of a polygon from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle;
- and
- e) a hold-down bolt extending through the insert passageway within the cutting insert and engaging with the toolholder passageway within the toolholder to retain the cutting insert mounted within the toolholder, wherein the hold down bolt has a head larger than the insert passageway and a hold down bolt shank smaller than the insert passageway such that the hold down bolt engages the forward end and retains the cutting insert within the toolholder.
12 more elements
A method of releasably mounting a cutting insert onto a toolholder having a bore extending rearwardly therein and a forwardly facing surface extending about the bore, wherein the insert has a forward end, a shank extending rearwardly therefrom, and a rearwardly facing face, wherein the shank has a taper narrowing away from the forward end and, wherein the tapered section of the bore includes longitudinally extending slots extending rearwardly from the forwardly facing surface of the toolholder adapted to receive matching projections extending from the cutting insert, the method comprising the steps of:
- a) inserting the insert into the toolholder bore;
- b) resiliently interference fitting the tapered shank into the toolholder bore to cause radial expansion of the toolholder;
- and
- c) securing a hold-down bolt by extending the hold-down bolt shank completely through the cutting insert and into the toolholder passageway to force the shank of the cutting insert into the toolholder bore so until the rearwardly facing face of the insert abuts against the forwardly facing surface of the toolholder, wherein the hold-down bolt has a head larger than the insert passageway and a hold-down bolt shank smaller than the insert passageway such that the hold down bolt engages the forward end of the insert and retains the cutting insert within the toolholder.
1 more element
A cutting insert adapted to be mounted within a toolholder having a bore extending rearwardly therein and a forwardly facing surface thereon, wherein the insert comprises:
- a) a cutting insert body having a forward end with a cutting edge thereupon, wherein the cutting edge is defined about the periphery of the cutting insert body within a plane at the forward end, wherein the plane is oriented perpendicular to the central axis and, wherein the cutting edge is continuous about the periphery;
- b) a shank receivable in the bore, extending rearwardly from the forward end, and having a central axis extending therethrough;
- c) a rearwardly facing face between the forward end of the insert body and the shank of the insert body for abutment with the forwardly facing surface of the toolholder;
- d) wherein the shank has a tapered section dimensioned to provide a resilient interference fit with the bore when the rearwardly facing face of the insert body is in abutment with the forwardly facing surface of the toolholder, and wherein the tapered shank narrows as it extends rearwardly;
- e) a passageway extending completely through the insert body along the central axis to accommodate a hold-down bolt extending the insert forward end for securing the cutting insert within the toolholder;
- and
- f) wherein the cutting edge extends around the perimeter of the cutting insert body, is spaced apart from, and is separate from the shank.
4 more elements
A cutting insert adapted to be mounted within a toolholder having a bore extending rearwardly therein and a forwardly facing surface thereon, wherein the insert comprises a cutting insert body having:
- a) a forward end with a cutting edge thereupon, wherein the cutting edge is defined about the periphery of the cutting insert body within a plane at the forward end, wherein the plane is oriented perpendicular to the central axis, wherein the cutting insert has a wall extending rearwardly from the cutting edge and, wherein the wall tapers inwardly as the wall extends from the forward end;
- b) a shank receivable in the bore, extending rearwardly from the forward end, and having a central axis extending therethrough;
- c) a rearwardly facing face between the forward end of the insert body and the shank of the insert body for abutment with the forwardly facing surface of the toolholder;
- d) wherein the shank has a tapered section dimensioned to radially expand and to provide a resilient interference fit with the bore when the rearwardly facing face of the insert body is in abutment with the forwardly facing surface of the toolholder, wherein the tapered shank narrows as it extends rearwardly and, wherein the shank has one of the shapes of a polygon from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle;
- and
- e) a passageway extending through the insert body along the central axis to accommodate a hold-down bolt for securing the cutting insert within the toolholder.
3 more elements
Dependencies are inferred from the claim text.