Cutting insert with internal coolant delivery and cutting assembly using the same
A metalcutting insert that is useful in chipforming and material removal from a workpiece The metalcutting insert includes a metalcutting insert body, which includes a cutting edge having at least one discrete cutting location. The metalcutting insert body further contains a distinct interior coolant passage communicating with the discrete cutting location. The distinct interior coolant passage has a coolant passage inlet defining a coolant passage inlet cross-sectional area, a coolant passage discharge defining a coolant passage discharge cross-sectional area, and an axial coolant passage length. The distinct interior coolant passage defines a coolant flow cross-sectional area along the axial coolant passage length thereof. The coolant passage inlet cross-sectional area is substantially the same as the coolant passage discharge cross-sectional area. The geometry of the coolant flow area changes along the axial coolant passage length.
1. A metal cutting insert for use in chipforming and material removal from a workpiece, the metal cutting insert comprising:
a metal cutting insert body including a cutting edge having at least one discrete cutting location, the metal cutting insert body comprising a base member and a core member, and the base member having a base rake surface and a base flank surface, and each one of the discrete cutting locations comprises a discrete portion of a cutting edge formed at the intersection of the base rake surface and the base flank surface, and the core member containing an aperture for receiving a fastener;
the metal cutting insert body further containing a distinct interior coolant passage communicating with the discrete cutting location;
the distinct interior coolant passage having a coolant passage inlet defining a coolant passage inlet cross-sectional area, a coolant passage discharge defining a coolant passage discharge cross-sectional area, and an axial coolant passage length;
the distinct interior coolant passage defining a coolant flow cross-sectional area along the axial coolant passage length thereof;
the coolant passage inlet cross-sectional area being substantially the same as the coolant passage discharge cross-sectional area; and
the geometry of the coolant flow cross-sectional area changing along the axial coolant passage length.
2. The metal cutting insert according to claim 1 wherein the base member being made from one of the materials selected from the group consisting of tools steels, cemented carbides, cermets, and ceramics by a powder metallurgical technique, and the core member being made from one of the materials selected from the group consisting of tools steels, cemented carbides, cermets, and ceramics by a powder metallurgical technique.
3. The metal cutting insert according to claim 2 wherein the core member being made from the same material as the core member.
4. The metal cutting insert according to claim 2 wherein the core member being made from a different material as the core member.
5. The metal cutting insert according to claim 1 wherein the base member being detachably joined to the core member.
6. The metal cutting insert according to claim 1 wherein the geometry of the coolant passage inlet cross-sectional area being different from the geometry of the coolant passage discharge cross-sectional area.
7. The metal cutting insert according to claim 1 wherein the cutting insert being received in a pocket of holder wherein the pocket having a coolant port therein, the coolant port having a coolant port cross-sectional area, and the coolant inlet cross-sectional area being less than the coolant port cross-sectional area in the pocket.
8. A metal cutting assembly for use in chipforming and material removal from a workpiece wherein a coolant source supplies coolant to the cutting assembly, the metal cutting assembly comprising:
a holder comprising a pocket, and the pocket including a flat surface containing a coolant port in communication with the coolant source wherein the coolant port has a coolant port cross-sectional area;
the pocket receiving a cutting insert;
the metalcutting insert comprising:
a cutting insert body including a cutting edge having at least one discrete cutting location the metal cutting insert body comprising a base member and a core member, and the base member having a base rake surface and a base flank surface, and each one of the discrete cutting locations comprises a discrete portion of a cutting edge formed at the intersection of the base rake surface and the base flank surface, and the core member containing an aperture for receiving a fastener;
the cutting insert body further containing a distinct interior coolant passage communicating with the discrete cutting location;
the distinct interior coolant passage having a coolant passage inlet defining a coolant passage inlet cross-sectional area, a coolant passage discharge defining a coolant passage discharge cross-sectional area, and an axial coolant passage length;
the distinct interior coolant passage defining a coolant flow cross-sectional area along the axial coolant passage length thereof;
the coolant passage inlet cross-sectional area being substantially the same as the coolant passage discharge cross-sectional area; and
the geometry of the coolant flow cross-sectional area changing along the axial coolant passage length.
9. The metal cutting assembly according to claim 8 wherein the coolant passage inlet cross-sectional area being smaller than the coolant port cross-sectional area in the pocket.
10. The metal cutting assembly according to claim 8 wherein the metal cutting insert body further containing a second distinct interior coolant passage communicating with the discrete cutting location.
11. The metal cutting assembly according to claim 10 wherein the second distinct interior coolant passage having a second coolant passage inlet defining a second coolant passage inlet cross-sectional area, a second coolant passage discharge defining a second coolant passage discharge cross-sectional area, and a second axial coolant passage length; the second distinct interior coolant passage defining a second coolant flow cross-sectional area along the second axial coolant passage length thereof; the second coolant passage inlet cross-sectional area being substantially the same as the second coolant passage discharge cross-sectional area; and the geometry of the second coolant flow cross-sectional area changing along the second axial coolant passage length.
12. The metal cutting assembly according to claim 10 wherein the metal cutting insert body further containing a third distinct interior coolant passage communicating with the discrete cutting location.
13. The metal cutting assembly according to claim 12 wherein the third distinct interior coolant passage having a third coolant passage inlet defining a third coolant passage inlet cross-sectional area, a third coolant passage discharge defining a third coolant passage discharge cross-sectional area, and a third axial coolant passage length; the third distinct interior coolant passage defining a third coolant flow cross-sectional area along the third axial coolant passage length thereof; the third coolant passage inlet cross-sectional area being substantially the same as the third coolant passage discharge cross-sectional area; and the geometry of the third coolant flow cross-sectional area changing along the third axial coolant passage length.