Cutting tool

Abstract

The invention relates to a cutting tool, in particular a milling tool, which comprises a tool body on which at least one cutting edge is provided. A coolant supply channel, from which at least one nozzle channel branches off fluidically, extends inside the tool body. The nozzle channel is configured to conduct coolant onto the cutting edge. A flow cross-section of the coolant supply channel is furthermore reduced in one flow direction.

Claims

1. A cutting tool, comprising: a tool body having a central axis; a plurality of cutting edges provided by a plurality of cutting inserts mounted on the tool body; a coolant supply chamber on a machine-side end of the tool body extending within the tool body; a plurality of coolant supply channels extending from the coolant supply chamber, each coolant supply channel having a flow cross-section (Q) that reduces with respect to a direction of flow; and a plurality of nozzle channels branching off from each of the coolant supply channels, each nozzle channel axially separated from an adjacent nozzle channel by a predetermined distance, d, along the central axis of the tool body, wherein each nozzle channel is associated with a single cutting edge for conducting coolant onto the associated single cutting edge, and wherein the predetermined distance, d, between each nozzle channel is matched to the reduction of the flow cross-section (Q) of an associated coolant supply channel such that substantially the same coolant pressure is provided at each nozzle channel.

2. The cutting tool according to claim 1, wherein the flow cross-section (Q) of the plurality of coolant supply channels continuously reduces with respect to the direction of flow.

3. The cutting tool according to claim 1, wherein at least two chip guide grooves are provided in the tool body, and the plurality of coolant supply channels is arranged circumferentially between the chip guide grooves.

4. The cutting tool according to claim 1, wherein each nozzle channel branches off substantially perpendicularly from the plurality of coolant supply channels.

5. The cutting tool according to claim 1, wherein an opening-side end cross-section of the nozzle channel is substantially slot-shaped.

6. The cutting tool according to claim 1, wherein each of the coolant supply channels extend helically around the central axis of the tool body.

7. The cutting tool according to claim 5, wherein a longitudinal axis of each opening-side end cross-section extends substantially parallel to the associated cutting edge.

8. The cutting tool according to claim 1, wherein the plurality of coolant supply channels extend substantially parallel to each other.

9. The cutting tool according to claim 1, wherein the cutting tool is a milling tool.

10. A milling cutter, comprising: a tool body having a central axis; a plurality of cutting edges provided on the tool body; a coolant supply chamber on a machine-side end of the tool body extending within the tool body; a plurality of coolant supply channels extending from the coolant supply chamber, each coolant supply channel having a flow cross-section (Q) that reduces with respect to a direction of flow; and a plurality of nozzle channels branching off from each of the coolant supply channels, each nozzle channel axially separated from an adjacent nozzle channel by a distance along the central axis of the tool body, wherein each nozzle channel is associated with a single cutting edge for conducting coolant onto the associated cutting edge, and wherein the predetermined distance, d, between each nozzle channel is matched to the reduction of the flow cross-section (Q) of an associated coolant supply channel such that substantially the same coolant pressure is provided at each nozzle channel.

11. The milling cutter according to claim 10, wherein the flow cross-section (Q) of the plurality of coolant supply channels continuously reduces with respect to the direction of flow.

12. The milling cutter according to claim 10, wherein at least two chip guide grooves are provided in the tool body, and the plurality of coolant supply channels is arranged circumferentially between the chip guide grooves.

13. The milling cutter according to claim 10, wherein each nozzle channel branches off substantially perpendicularly from the plurality of coolant supply channels.

14. The milling cutter according to claim 10, wherein an opening-side end cross-section of the nozzle channel is substantially slot-shaped.

15. The milling cutter according to claim 14, wherein a longitudinal axis of each opening-side end cross-section extends substantially parallel to the associated cutting edge.

16. The milling cutter according to claim 10, wherein each of the coolant supply channels extend helically around the central axis of the tool body.

17. The milling cutter according to claim 10, wherein the plurality of coolant supply channels extend substantially parallel to each other.

18. The milling cutter according to claim 10, wherein the cutting tool is a milling tool.

19. A milling cutter, comprising: a tool body having a central axis; a plurality of cutting edges provided by a plurality of cutting insert mounted on the tool body; a coolant supply chamber on a machine-side end of the tool body extending within the tool body; a plurality of coolant supply channels extending from the coolant supply chamber, each coolant supply channel having a flow cross-section (Q) that reduces with respect to a direction of flow; and a plurality of nozzle channels branching off from each of the coolant supply channels, each nozzle channel axially separated from an adjacent nozzle channel by a distance along the central axis of the tool body, wherein the predetermined distance, d, between each nozzle channel is matched to the reduction of the flow cross-section (Q) of an associated coolant supply channel such that substantially the same coolant pressure is provided at each nozzle channel.

20. The milling cutter according to claim 19, wherein each nozzle channel is associated with a single cutting edge for providing coolant to the associated single cutting edge.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained below with the aid of a design example, which is shown in the accompanying drawings. The figures show:

(2) FIG. 1 a cutting tool according to the invention in a perspective view,

(3) FIG. 2 the cutting tool of FIG. 1 in a partially transparent illustration, whereby no cutting inserts are shown,

(4) FIG. 3 a detail III of the cutting tool of FIG. 2,

(5) FIG. 4 a longitudinal section through the cutting tool of FIGS. 1 to 3,

(6) FIG. 5 an exemplary detail view of the cutting tool of FIGS. 1 to 4, and

(7) FIG. 6 another exemplary detail view of the cutting tool of FIGS. 1 to 4.

DETAILED DESCRIPTION

(8) FIG. 1 shows a cutting tool 10, which, in the embodiment shown, is a milling tool.

(9) The cutting tool 10 comprises a tool body 12 with a tool body central axis 13, about which it can rotate for the machining of materials. In the embodiment shown, a total of 30 active cutting edges 14 are provided on the tool body 12, of which only a few are provided with a reference sign in FIG. 1 for the sake of clarity.

(10) All of the cutting edges 14 are provided on a respective associated cutting insert 16, which is attached to the tool body 12. Therefore, exactly one active cutting edge 14 is provided by each cutting insert 16. Also of the cutting inserts 16 in FIG. 1, only a few are provided with a reference sign.

(11) The overall 30 cutting inserts 16 are arranged along five, substantially parallel spirals 18 on the periphery of the tool body 12. In other words, the cutting inserts 16 are divided into five groups of six cutting inserts 16, wherein the cutting inserts 16 of each group are positioned on the tool body 12 in a helical manner.

(12) Five chip guide grooves 20 for the reliable removal of chips produced by the cutting edges 14 are provided as well. The chip guide grooves 20 also extend helically.

(13) The tool body 12 is configured to supply the cutting edges 14 with coolant.

(14) For this purpose, a coolant supply chamber 22 is provided on a machine-side end of the tool body 12, via which the cutting tool 10 can be supplied with coolant (see in particular FIGS. 2 and 4).

(15) In the design example shown, five coolant supply channels 24 extend from the coolant supply chamber 22 of which only one can be seen in FIGS. 2 and 3.

(16) The coolant supply channels 24 extend substantially parallel to one another.

(17) In the embodiment shown, the coolant supply channels 24 also extend helically with respect to the tool body central axis 13.

(18) They are furthermore respectively arranged circumferentially between two adjacent chip guide grooves 20. Chip guide grooves 20 and coolant supply channels 24 thus alternate on the periphery of the tool body 12.

(19) Each of the coolant supply channels 24 has a flow cross-section Q that decreases continuously along a flow direction 25 of the coolant; here, therefore, starting from the coolant supply chamber 22 toward the cutting edges 14.

(20) Six nozzle channels 26 then branch off fluidically from each of the coolant supply channels 24.

(21) Each nozzle channel 26 is associated with one of the cutting edges 14 in order to conduct coolant onto it. There is therefore a 1:1 relationship between the nozzle channels 26 and the cutting edges 14.

(22) The nozzle channels 26 that branch off from a common coolant supply channel 24 are furthermore spaced apart from one another along the tool body central axis 13.

(23) The distances between the individual nozzle channels 26 are matched to the reduction of the flow cross-section Q of the associated coolant supply channel 24 such that substantially the same pressure prevails at each branch of a nozzle channel 26 from the coolant supply channel 24.

(24) As is evident in particular based on FIGS. 2 and 3, the nozzle channels 26 branch off substantially perpendicularly from the respective associated coolant supply channel 24.

(25) Each nozzle channel 26 also has an opening-side end cross-section 32, which is configured as a rectangular slot in the shown embodiment (see FIGS. 5 and 6). The opening-side end cross-section 32 can, of course, also have a slot-shaped geometry that deviates from a rectangular shape, e.g. curved.

(26) A slot longitudinal axis extends substantially parallel to the associated cutting edge 14.

(27) A coolant jet 34 can thus be directed precisely onto the associated cutting edge 14, so that the entire cutting edge 14 is substantially uniformly supplied with coolant. Ideally, the coolant jet 34 is linear when it hits the cutting edge 14 and is the same length as the cutting edge 14.