CN-117295575-B - Cutting insert and cutting tool assembly including the same

Abstract

Embodiments of a cutting insert are provided. The cutting insert includes an upper surface, a lower surface, a plurality of side surfaces extending between the upper and lower surfaces, an insert bore extending through the upper and lower surfaces, and a corner provided with a cutting edge. At least one of the upper surface and the lower surface has a plurality of recesses extending between the insertion hole and the corner. The plurality of recesses includes a first recess into which a portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion and a second recess into which another portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion. The second recess has a sidewall spaced from another portion of the mounting portion.

Inventors

• CUI CHANGXI
• ZHENG CHANGYUAN

Assignees

• 特固克有限会社

Dates

Publication Date

20260512

Application Date

20220519

Priority Date

20210521

Claims (18)

1. 1. A cutting insert supported by a mounting portion when mounted on a cutting tool, the cutting insert comprising: An upper surface; A lower surface; a plurality of side surfaces extending between the upper surface and the lower surface; an insertion hole extending through the upper surface and the lower surface, and The corner portions of the cutting edges are provided, Wherein at least one of the upper surface and the lower surface has a plurality of recesses extending between the insertion hole and the corner portion, The plurality of recesses includes a first recess into which a first portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion and a second recess into which a second portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion, and The second recess has a side wall spaced from the second portion of the mounting portion, Wherein the first recess is in contact with the first portion of the mounting portion at two points and the second recess has a bottom surface in contact with the second portion of the mounting portion.
2. 2. The cutting insert according to claim 1, wherein the first recess and the mounting portion contact each other at a pair of first contact points, The bottom surface of the second recess and the mounting portion contact each other at a second contact point, and A line connecting one of the first contact points and the second contact point forms an inclination angle with respect to a reference plane perpendicular to an extending direction of the insertion hole.
3. 3. The cutting insert according to claim 2, wherein each of said upper and lower surfaces comprises a rake surface inclined with respect to said reference plane perpendicular to said direction of extension of said insert bore, The upper surface and the lower surface are symmetrical to each other, and Each of the upper surface and the lower surface includes three corners.
4. 4. The cutting insert according to claim 3, wherein the bevel angle is greater than 0 ° and 9 ° or less.
5. 5. The cutting insert according to claim 3, wherein the bevel angle is 4 ° to 6 °.
6. 6. The cutting insert according to claim 2, wherein two corners are provided on the upper surface, and the two corners are rotationally symmetrical at 180 ° with respect to a central axis of the insert hole.
7. 7. The cutting insert according to claim 6, wherein the bevel angle is greater than 0 ° and 9 ° or less.
8. 8. The cutting insert according to claim 6, wherein the bevel angle is 1 ° to 2 °.
9. 9. A cutting tool assembly, comprising: a holder configured such that the cutting insert is supported by the mounting portion, Wherein the mounting portion includes a first protrusion and a second protrusion formed on a surface supporting the cutting insert, The holder is configured to contact a side surface of the cutting insert to support the cutting insert, and fix the cutting insert to the mounting portion by a fixing means, The cutting insert comprising an upper surface, a lower surface, a plurality of side surfaces extending between the upper surface and the lower surface, an insert bore extending through the upper surface and the lower surface, and a corner provided with a cutting edge, At least one of the upper surface and the lower surface has a plurality of recesses extending between the insertion hole and the corner portion, The plurality of recesses includes a first recess into which the first protrusion of the mounting portion is inserted when the cutting insert is supported by the mounting portion and a second recess into which the second protrusion of the mounting portion is inserted when the cutting insert is supported by the mounting portion, and The second recess has a side wall spaced from the second projection of the mounting portion, Wherein the mounting portion is a shim and the holder is configured to secure the cutting insert and the shim, Wherein the first recess is in contact with the first protrusion of the gasket at two points, and the second recess has a bottom surface in contact with the second protrusion of the gasket.
10. 10. The cutting tool assembly of claim 9, wherein the mounting portion is a bottom surface of a pocket portion of the holder.
11. 11. The cutting tool assembly of claim 9, wherein the first recess and the first projection of the shim contact each other at a pair of first contact points, The bottom surface of the second recess and the second protrusion of the gasket contact each other at a second contact point, and A line connecting one of the first contact points and the second contact point forms an inclination angle with respect to a reference plane perpendicular to an extending direction of the insertion hole.
12. 12. The cutting tool assembly according to claim 11, wherein each of the upper and lower surfaces of the cutting insert comprises a rake surface inclined relative to the reference plane perpendicular to the direction of extension of the insert bore, The upper surface and the lower surface are symmetrical to each other, and Each of the upper surface and the lower surface includes three corners.
13. 13. The cutting tool assembly of claim 12, wherein the upper surface of the cutting insert forms an angle of-5 ° to +5° with respect to a centerline of a workpiece to be cut by the cutting insert when the cutting insert is mounted on the holder.
14. 14. The cutting tool assembly of claim 11, wherein two corners are disposed on the upper surface and the two corners are rotationally symmetrical at 180 ° with respect to a central axis of the insertion bore.
15. 15. The cutting tool assembly of claim 11, wherein only a side surface of the cutting insert on an opposite side of the first recess is in contact with the holder when the cutting insert is mounted on the holder.
16. 16. The cutting tool assembly of claim 11, wherein the cutting edge on one side of the first recess of the cutting insert forms an angle of less than 90 ° with respect to a central axis of rotation of a workpiece and the cutting edge on the other side of the first recess of the cutting insert forms an angle of greater than 90 ° with respect to the central axis of rotation of a workpiece.
17. 17. A cutting insert in combination with a shim, the cutting insert being disposed on the shim, The cutting insert includes: Upper and lower surfaces and a plurality of side surfaces extending between the upper and lower surfaces; An insertion hole extending through the upper surface and the lower surface, the insertion hole having a central axis, at least the upper surface having rotational symmetry about the central axis; At least two corners each formed at the junction of two adjacent side surfaces, each corner being provided with a pair of cutting edges formed at the intersection of the upper surface and the two adjacent side surfaces, A first recess formed in the lower surface adjacent each corner, and At least two second recesses formed in the lower surface away from the first recess, each second recess having a second recess sidewall, wherein, In a plan view of the lower surface, the first recess has a different shape from the two second recesses, and The gasket includes: Upper and lower shim surfaces and a plurality of shim side surfaces extending between the upper and lower shim surfaces; A shim hole extending through the upper shim surface and the lower shim surface, the shim hole having a central axis about which the upper surface is not rotationally symmetrical; At least one shim corner formed at the junction of two adjacent shim side surfaces; a first projection formed on the upper surface of the shim adjacent to the at least one shim corner, and At least two second protrusions formed on the upper surface of the shim away from the at least one shim corner, each second protrusion having a second protrusion sidewall, wherein: The first projection having a different shape from the second projection in a plan view of the upper pad surface, and Wherein: the first protrusion at least partially occupies the first recess, and The two second protrusions at least partially occupy the two second recesses, The cutting insert has a triangular shape with three side surfaces, three corners with cutting edges, three first recesses and three second recesses, each second recess being located between one of the first recesses and the insert hole, The upper gasket surface is provided with exactly one first protruding part and exactly two second protruding parts; The first recess is in contact with the first protrusion at a pair of spaced apart first contact points; the two second recesses being in contact with the upper surfaces of the two second protrusions at respective second contact points, and A line connecting one of the first contact points with the second contact point on the same side as the first contact point with respect to the insertion hole has a non-zero inclination angle (p) with respect to a Reference Plane (RP) perpendicular to the extending direction of the insertion hole.
18. 18. A cutting insert in combination with a shim, the cutting insert being disposed on the shim, The cutting insert includes: Upper and lower surfaces and a plurality of side surfaces extending between the upper and lower surfaces; An insertion hole extending through the upper surface and the lower surface, the insertion hole having a central axis, at least the upper surface having rotational symmetry about the central axis; At least two corners each formed at the junction of two adjacent side surfaces, each corner being provided with a pair of cutting edges formed at the intersection of the upper surface and the two adjacent side surfaces, A first recess formed in the lower surface adjacent each corner, and At least two second recesses formed in the lower surface away from the first recess, each second recess having a second recess sidewall, wherein, In a plan view of the lower surface, the first recess has a different shape from the two second recesses, and The gasket includes: Upper and lower shim surfaces and a plurality of shim side surfaces extending between the upper and lower shim surfaces; A shim hole extending through the upper shim surface and the lower shim surface, the shim hole having a central axis about which the upper surface is not rotationally symmetrical; At least one shim corner formed at the junction of two adjacent shim side surfaces; a first projection formed on the upper surface of the shim adjacent to the at least one shim corner, and At least two second protrusions formed on the upper surface of the shim away from the at least one shim corner, each second protrusion having a second protrusion sidewall, wherein: The first projection having a different shape from the second projection in a plan view of the upper pad surface, and Wherein: the first protrusion at least partially occupies the first recess, and The two second protrusions at least partially occupy the two second recesses, wherein: The cutting insert has a rhombic shape with four side surfaces, two corners with cutting edges, two first recesses positioned along a virtual line extending between the two corners and separated from each other by the insert hole, and four second recesses, each of the four second recesses located at an intersection between the lower surface and a different one of the four side surfaces; the upper gasket surface is provided with exactly one first protruding part and exactly two second protruding parts; one of the first recesses is in contact with the first protrusion at a pair of spaced apart first contact points; Two of the four second recesses are in contact with the upper surfaces of the two second protrusions at respective second contact points, and A line connecting one of the first contact points with the second contact point on the same side as the first contact point with respect to the insertion hole has a non-zero inclination angle (p) with respect to a Reference Plane (RP) perpendicular to the extending direction of the insertion hole.

Description

Cutting insert and cutting tool assembly including the same Technical Field The present disclosure relates to cutting inserts (cutting inserts) and cutting tool assemblies including the same. Background When cutting a workpiece using a cutting tool, in order to improve roughness and quality of a finished surface, it is important to allow chips to be smoothly generated into a circular shape and to ensure a space in which the generated chips can be smoothly discharged. In particular, in the case of turning inserts (turning inserts), the entry angle (i.e., the angle between the cutting edge of the insert and the workpiece surface) during back-turning is smaller than during front-turning. In this way, it is more important to ensure a space in which chips can be smoothly discharged by effectively arranging the cutting edge and the chip forming machine with respect to the workpiece. Disclosure of Invention Technical problem In the conventional turning insert, in the case of a positive single-sided insert having a triangular shape and a holder to which such a positive single-sided insert is mounted, both sides of the insert are supported by an insert supporting portion of the holder located in the rear turning direction. Due to this support structure, it is difficult to secure a chip discharge space, and there is a problem in that the cutting depth for post turning is limited. Further, in the case of a conventional turning insert, having a negative double-sided insert of a triangular shape and a holder to which such a negative double-sided insert is mounted, in addition to the problems caused by the structure of the insert supporting portion of the aforementioned holder, the insert is mounted on the holder such that the upper surface of the insert is inclined at a negative angle with respect to the center line of the workpiece. Therefore, it is inevitable to secure a relatively narrow chip discharge space as compared with a chip discharge space obtainable in the case of using a positive single-sided triangular insert in which the arrangement of the cutting edge and the upper surface of the chip forming machine has an angle almost coinciding with the center line of the workpiece. For this reason, the state of the generated chips is poor and the flow of the discharged chips may be not smooth. Solution to the problem Various embodiments of the present disclosure provide a cutting insert capable of smoothly generating cutting and satisfactorily discharging chips during a turning operation, and a cutting tool assembly including the same. Further, various embodiments of the present disclosure provide a cutting insert having a rigid support structure without an insert support portion of a holder, and a cutting tool assembly including the cutting insert. According to one embodiment of the present disclosure, there is provided a cutting insert supported by a mounting portion when mounted on a cutting tool, the cutting insert comprising an upper surface, a lower surface, a plurality of side surfaces extending between the upper surface and the lower surface, an insertion hole extending through the upper surface and the lower surface, and a corner provided with a cutting edge, wherein at least one of the upper surface and the lower surface has a plurality of recesses extending between the insertion hole and the corner, the plurality of recesses including a first recess into which a portion of the mounting portion is inserted when the cutting insert is supported by the mounting portion, and a second recess having a side wall spaced from another portion of the mounting portion, when the cutting insert is supported by the mounting portion. In one embodiment, the first recess may contact the mounting portion at two points, and the second recess may have a bottom surface that contacts the mounting portion. In one embodiment, the first recess and the mounting portion contact each other at a pair of first contact points, the bottom surface of the second recess and the mounting portion may contact each other at a second contact point, and a line connecting one of the first contact points and the second contact point may form an inclination angle with respect to a reference plane perpendicular to an extending direction of the insertion hole. In one embodiment, each of the upper and lower surfaces may include a rake surface inclined with respect to a reference plane perpendicular to an extending direction of the insertion hole, the upper and lower surfaces may be symmetrical to each other, and each of the upper and lower surfaces may include three corners. In one embodiment, the tilt angle may be greater than 0 ° and 9 ° or less, preferably 4 ° to 6 °. In one embodiment, two corners may be provided on the upper surface, and the two corners may be rotationally symmetrical at 180 ° with respect to a central axis of the insertion hole. In one embodiment, the tilt angle may be greater than 0 ° and 9 ° or less, preferably 1 ° to 2 °. Accord