Cutting tool and a nozzle with internally extending grooves
The present disclosure relates to a cutting tool for metal chip removing machining having at least one internal coolant channel for fluid having a flow direction. The at least one internal coolant channel having a length and including a plurality of grooves extending internally at least partially along the coolant channel.
1. A cutting tool for metal chip removing machining comprising:
a holder body;
a cutting insert; and
a nozzle, the nozzle having a single through hole for a fastening member and having at least one internal coolant channel for fluid having a flow direction, the at least one internal coolant channel having a length, wherein the at least one coolant channel includes a plurality of grooves extending internally at least partially along the at least one internal coolant channel, the nozzle having a forward end, a rear end and a bottom face, wherein the through hole extends between the bottom face and an opposite top face being provided in the nozzle and extending from a first opening to a second opening, the first opening connecting to a coolant supply conduit in the holder body, the second opening serving as an exit for the coolant at the forward end, wherein the at least one internal coolant channel and the first opening are spaced from the through hole.
2. The tool according to claim 1 , wherein a direction of the plurality of grooves coincides with the flow direction at least along half of the length of the at least one internal coolant channel.
3. The tool according to claim 1 , wherein the plurality of grooves coincide with the flow direction along at least 80% of the length of the at least one internal coolant channel.
4. The tool according to claim 1 , wherein a size of the groove is in the range of 0.1 to 30 micrometers.
5. The tool according to claim 1 , wherein the at least one internal coolant channel has a changing cross-section.
6. The tool according to claim 1 , wherein the at least one internal coolant channel has a diameter in the range of 0.1 mm to 8 mm.
7. The tool according to claim 1 , wherein the at least one internal coolant channel has a first and a second opening, a diameter of the second opening of the at least one internal coolant channel defining a smallest diameter of the at least one internal coolant channel.
8. The tool according to claim 1 , wherein the nozzle is a removable nozzle for turning applications and wherein the tool includes a seal element arranged to coolant-tightly seal the nozzle relative to the holder body.
9. The tool according to claim 1 , wherein the at least one internal coolant channel follows a smooth path without sudden directional changes.
10. The tool according to claim 1 , wherein there are two internal coolant channels extending at opposite sides of the through hole.
11. The tool according to claim 1 , wherein the first opening is situated between the through hole and the rear end.
12. The tool according to claim 1 , wherein the bottom face of the nozzle includes a guide device such as a projection or recess adjacent to the forward end arranged to set the direction of the nozzle by having the guide device cooperating with a recess or projection on the cutting insert or a clamping means.
13. The tool according to claim 1 , wherein the nozzle is a one- piece unit made through additive manufacturing.
14. The tool according to claim 1 , wherein a single fastening member or screw secures both the cutting insert and the nozzle.
15. A nozzle arranged for metal chip removing machining having comprising:
a forward end, a rear end, a bottom face and a top face opposed to the bottom face;
at least one internal coolant channel for fluid having a flow direction, the at least one internal coolant channel having a length, wherein the at least one internal coolant channel includes a plurality of grooves extending internally at least partially along the at least one internal coolant channel; and
a single through hole arranged for a fastening member and having the at least one internal coolant channel, the through hole extending between the bottom face and the top face and extending from a first opening to a second opening, the first opening being connected to a coolant supply conduit in a holder body and the second opening serving as an exit for the coolant at the forward end, wherein the at least one internal coolant channel and the first opening are spaced from the through hole.
16. The tool according to claim 1 , wherein at least one cooling channel of the at least one internal coolant channel is curved along its length.
17. The tool according to claim 1 , wherein each of the plurality of grooves defines a recess in a surface of the at least one internal coolant channel.