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NOZZLE FOR PROVIDING COOLANT FLUID TO A CUTTING EDGE OF A METAL CUTTING TOOL AND A METAL CUTTING TOOL

20230191498 · 2023-06-22

    Inventors

    Cpc classification

    International classification

    Abstract

    A nozzle is arranged to provide coolant fluid to a cutting edge of a metal cutting tool. The nozzle includes at least one internal inlet coolant channel and at least one internal outlet coolant channel. The internal inlet coolant channel is connected to a coolant inlet and the at internal outlet coolant channel is connected to a coolant outlet for directing the coolant fluid to the cutting edge. The nozzle further includes a plenum chamber having at least one inlet opening connecting the internal inlet coolant channel and the plenum chamber and at least one outlet opening connecting the internal outlet channel and the plenum chamber. Each of the inlet openings have a cross-sectional area A1.sub.i and each of the outlet openings have a cross-sectional area A2.sub.i, wherein—Σ.sub.i=1.sup.nA1.sub.i>Σ.sub.i=1.sup.mA2.sub.i, where i is an integer, n is the number of inlet openings, and m is the number of outlet openings.

    Claims

    1. A nozzle arranged for providing coolant fluid to a cutting edge of a metal cutting tool, the nozzle comprising: at least one internal inlet coolant channel; at least one internal outlet coolant channel, wherein the at least one internal inlet coolant channel is connected to a coolant inlet, and the at least one internal outlet coolant channel is connected to a coolant outlet for directing the coolant fluid to the cutting edge; at least one plenum chamber including at least one inlet opening connecting the at least one internal inlet coolant channel and the at least one plenum chamber; and at least one outlet opening connecting the at least one internal outlet channel and the at least one plenum chamber, wherein each of the at least one inlet openings have a cross-sectional area A1.sub.i, and each of the at least one outlet openings have a cross-sectional area A2.sub.i, wherein Σ.sub.i=1.sup.nA1.sub.i>Σ.sub.i=1.sup.mA2.sub.i, where i is an integer, n is the number of inlet openings, and m is the number of outlet openings.

    2. The nozzle according to claim 1, wherein the at least one outlet opening is located in a plane P, and the coolant outlet is located in a plane Q, wherein the plane P is parallel with the plane Q.

    3. The nozzle according to claim 1, wherein the at least one internal outlet coolant channel is linear and cross-sectional area A2.sub.i is constant.

    4. The nozzle according to claim 1, wherein the at least one internal outlet coolant channel has a length L.sub.out, wherein 0.5 mm≤L.sub.out≤2.0 mm.

    5. The nozzle according to claim 1, wherein 1.3 ≤ .Math. i = 1 n ⁢ A ⁢ 1 i .Math. i = 1 m ⁢ A ⁢ 2 i ≤ 56.3 .

    6. The nozzle according to claim 1, wherein 1.5 mm.sup.2≤A1.sub.i≤15.0 mm.sup.2.

    7. The nozzle according to claim 1, wherein the at least one plenum chamber has an internal volume V, wherein 40 mm.sup.3≤V≤420 mm.sup.3.

    8. The nozzle according to claim 1, wherein the at least one internal outlet coolant channel comprises at least two internal outlet coolant channels.

    9. The nozzle according to claim 1, wherein the at least one plenum chamber comprises at least two plenum chambers, wherein each plenum chamber includes the at least one inlet opening connecting the plenum chamber with at least one internal inlet coolant channel, and at least one outlet opening connecting the plenum chamber with at least one internal outlet coolant channel.

    10. A metal cutting tool, comprising: a tool holder body; a cutting insert mounted in the tool holder body; and a nozzle according to claim 1 attached to the tool holder body.

    11. The cutting tool according to claim 10, wherein the nozzle is a removable nozzle attached to the tool holder body.

    12. The cutting tool according to claim 10, wherein the nozzle is a clamp pressing against a part of the cutting insert.

    Description

    BRIEF DESCRIPTION OF THE DRAWINGS

    [0046] FIG. 1 is a perspective view of a metal cutting tool according to an embodiment of the invention,

    [0047] FIG. 2 is a side view of a nozzle according to a first embodiment of the invention,

    [0048] FIG. 3A is a front view of a nozzle according to a first embodiment of the invention,

    [0049] FIG. 3B is a front view of a nozzle according to a second embodiment of the invention,

    [0050] FIG. 4A is a top view of a nozzle according to a first embodiment of the invention,

    [0051] FIG. 4B is a top view of a nozzle according to a second embodiment of the invention,

    [0052] FIG. 4C is a top view of a nozzle according to a third embodiment of the invention,

    [0053] FIG. 4D is a top view of a nozzle according to a fourth embodiment of the invention,

    [0054] FIG. 5 is a schematic view of the plenum chamber in the nozzle according to the second embodiment of the invention as illustrated in FIG. 4B.

    DETAILED DESCRIPTION

    [0055] The disclosed embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that the disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numbers refer to like elements throughout. The elements illustrated in the drawings are not necessary according to scale. Some elements might have been enlarged in order to clearly illustrate those elements.

    [0056] FIG. 1 illustrates a metal cutting tool (1) according to an embodiment the invention. The metal cutting tool (1) comprises a tool holder body (2), a cutting insert (5) mounted in the tool holder body (2), and a nozzle (10) for providing coolant fluid to a cutting edge of the metal cutting tool (1). The metal cutting tool (1) according to this embodiment is a turning tool.

    [0057] FIG. 2 illustrates a side view of the nozzle (10) according to a first embodiment of the invention. The nozzle (10) comprises an internal inlet coolant channel (16.sub.11) connected to a coolant inlet (18) and an internal outlet coolant channel (17.sub.11), with a length L.sub.out, connected to a coolant outlet (19.sub.11) for ejecting coolant fluid towards a cutting edge of the metal cutting tool. The nozzle (10) further comprises a plenum chamber (20.sub.1) connecting the internal inlet coolant channel (16.sub.11) and internal outlet coolant channel (17.sub.11). The outlet coolant channel (17.sub.11) is connecting to the plenum chamber (20.sub.1) in a plane Q and the coolant outlet (19.sub.11) is located in a plane P. In the illustrated embodiment the plane Q is parallel with the plane P.

    [0058] FIG. 3A illustrates a front view of a nozzle (10) according to a first embodiment of the invention. In this embodiment, the nozzle (10) comprises one coolant outlet (19.sub.11) for ejecting the coolant fluid towards a cutting edge of the metal cutting tool.

    [0059] FIG. 4A illustrates a top view of a nozzle (10) according to a first embodiment of the invention. In this embodiment, the nozzle (10) comprises one internal inlet coolant channel (16.sub.11) connecting to a coolant inlet (18) and one plenum chamber (20.sub.1). The nozzle (10) further comprises one internal outlet coolant channel (17.sub.11) connecting to a coolant outlet (19.sub.11) and the plenum chamber (20.sub.1). The nozzle (10) further comprises a bore (15) for a fastening element, e.g. a screw, for fastening the nozzle (10) to the tool holder body (2).

    [0060] In the following, alternative embodiments will be described, focusing on differenting features.

    [0061] FIG. 3B illustrates a front view of a nozzle (10) according to a second embodiment of the invention. In this embodiment, the nozzle (10) comprises two coolant outlets (19.sub.11; 19.sub.12) for ejecting the coolant fluid towards a cutting edge of the metal cutting tool.

    [0062] FIG. 4B illustrates a top view of a nozzle (10) according to a second embodiment of the invention. In this embodiment, the nozzle (10) comprises two internal inlet coolant channels (16.sub.11; 16.sub.12) connecting to a coolant inlet (18) and one plenum chamber (20.sub.1). The nozzle (10) further comprises two internal outlet coolant channels (17.sub.11; 17.sub.12) connecting to two coolant outlets (19.sub.11; 19.sub.12) and the plenum chamber (20.sub.1). The nozzle (10) further comprises a bore (15) for a fastening element, e.g. a screw, for fastening the nozzle (10) to the tool holder body (2).

    [0063] FIG. 5 illustrates schematically the plenum chamber (20.sub.1) of the second embodiment. The plenum chamber (20.sub.1) has an internal volume V and comprises a first inlet opening (21.sub.11) having a cross-sectional area A1.sub.1, and a second inlet opening (21.sub.12) having a cross-sectional area A1.sub.2. The plenum chamber (20.sub.1) further comprises a first outlet opening (22.sub.11) having a cross-sectional area A2.sub.1, and a second outlet opening (22.sub.12) having a cross-sectional area A2.sub.2.

    [0064] In FIG. 5, the plenum chamber (20.sub.1) is illustrated as a rectangular block, and the inlet openings (21.sub.11; 21.sub.12) and the outlet openings (22.sub.11; 22.sub.12) as circular openings. However, in other embodiments, other geometrical shapes could be given, such as for example a spherical plenum chamber with square shaped inlet openings and triangular outlet openings.

    [0065] FIG. 4C illustrates a top view of a nozzle (10) according to a third embodiment of the invention. In this embodiment, the nozzle (10) comprises one internal inlet coolant channel (16.sub.11) connecting to a coolant inlet (18) and one plenum chamber (20.sub.1). The nozzle (10) further comprises two internal outlet coolant channels (17.sub.11; 17.sub.12) connecting to two coolant outlets (19.sub.11; 19.sub.12) and the plenum chamber (20.sub.1). The nozzle (10) further comprises a bore (15) for a fastening element, e.g. a screw, for fastening the nozzle (10) to the tool holder body (2).

    [0066] FIG. 4D illustrates a top view of a nozzle (10) according to a fourth embodiment of the invention. In this embodiment, the nozzle (10) comprises a first internal inlet coolant channel (16.sub.11) connecting to a coolant inlet (18) and a first plenum chamber (20.sub.1). The nozzle (10) further comprises a second internal inlet coolant channel (16.sub.21) connecting to a coolant inlet (18) and a second plenum chamber (20.sub.2). Further, the nozzle (10) comprises a first internal outlet coolant channel (17.sub.11) connecting to a coolant outlet (19.sub.11) and the first plenum chamber (20.sub.1), and a second internal outlet coolant channel (17.sub.21) connecting to a coolant outlet (19.sub.21) and the second plenum chamber (20.sub.2). The nozzle (10) further comprises a bore (15) for a fastening element, e.g. a screw, for fastening the nozzle (10) to the tool holder body (2).

    [0067] In the second and fourth illustrated embodiments, the two internal inlet coolant channels (16.sub.11; 16.sub.12; 16.sub.21) connects to the same coolant inlet (18). However, they could also connect to different coolant inlets.