Coolant reflector and turning tool equipped with coolant reflector

Abstract

The present invention relates to a coolant reflector (12, 13, 14) for a turning tool and a turning tool including such a coolant reflector. The turning tool includes a tool body (1) including a front end (2), a rear end (3), a peripheral surface (4) connecting the front and rear ends, and a central axis (C) extending from the front end to the rear end. The turning tool further includes cutting inserts (5, 6) disposed in the tool body or seats for accommodating the cutting inserts, and coolant channels (9) extending at least partially through the tool body (1) to supply coolant to the cutting inserts (5, 6), the coolant channels being in fluid communication with an outlet opening (11) of the tool body. The coolant reflector includes a reflective structure (15, 16, 25) positioned to receive coolant flowing out of the outlet opening (11) of the tool body (1) and reflect the coolant at least partially backward and toward the cutting inserts (5, 6).

Description

[Technical Field]

[0001] The present invention relates to metal cutting, and in particular to turning operations in which a turning tool is used to machine a rotating workpiece. [Background technology]

[0002] In the field of metal cutting, turning tools may be used to machine the surface of a rotating workpiece, for example the inner surface of a hole in the workpiece. In such machining operations, the tool may extend along a central axis that is parallel to the axis of rotation of the workpiece.

[0003] When machining the inside of a hole in a rotating workpiece, if chips generated remain inside the hole, they may adversely affect the machining results.

[0004] When machining inside a closed hole, chips must be evacuated in the same manner as the turning tool enters the hole. Applying coolant to the cutting zone can help evacuate chips to some extent. European Patent No. 1,806,191 discloses a turning tool with chip flutes to aid chip evacuation, with the coolant flowing out of openings in the front of the turning tool, located on the side of the tool opposite the insert seat. The main flow of coolant then travels through the bottom of the closed hole toward the cutting insert and chip flutes. However, this may not provide efficient chip evacuation in all applications, for example, when machining deep holes with a large distance between the cutting tool and the bottom of the hole. When machining the interior of an open-ended hole, chips can be evacuated through openings opposite the place where the turning tool enters the hole. However, this can cause other problems, such as the coolant spreading uncontrollably to unwanted locations, potentially ending up on the workshop floor.

[0005] Therefore, there is a need for a solution that provides improved coolant distribution and chip evacuation in internal turning operations. Summary of the Invention

[0006] It is an object of the present invention to provide a turning tool which alleviates the drawbacks of the prior art and achieves improved chip evacuation when machining the interior of a hole in a rotating workpiece. Another object of the present invention is to achieve a controlled distribution of coolant for the turning tool to mitigate any adverse effects caused by the spread of coolant in the machining environment.

[0007] Thus, according to a first aspect, the present invention relates to a turning tool comprising a tool body including a leading end, a trailing end, a peripheral surface connecting the leading end and the trailing end, and a central axis extending from the leading end to the trailing end. The turning tool further comprises a cutting insert disposed within the tool body or a seat for accommodating the cutting insert, and a coolant channel extending at least partially through the tool body for supplying coolant to the cutting insert, the coolant channel being in fluid communication with an outlet opening in the tool body. The turning tool further comprises a coolant reflector including a reflective structure arranged to receive coolant exiting the outlet opening of the tool body and reflect the coolant at least partially backward and toward the cutting insert.

[0008] The coolant is thereby directed, at least to some extent, backward toward the cutting insert, which corresponds to the direction of exit from the machined hole when machining the inside of a hole in a rotating workpiece. As a result, generated chips are flushed out of the hole. This is particularly useful when machining in open-ended holes (through holes), or deep blind holes, where the bottom surface of the hole does not contribute to redirecting the coolant backward toward the cutting insert and out of the hole.

[0009] A "turning tool" should be understood as a cutting tool used to machine a rotating workpiece. Such a tool may also be referred to as a boring bar in the context of machining the inner surface of a hole in a rotating workpiece. The central axis of such a turning tool is parallel to, but typically not coaxial with, the workpiece's axis of rotation, and the turning tool can be moved radially within the hole to engage the workpiece's surface. This allows for machining varying internal profiles of the hole by varying the radial displacement between the turning tool and the workpiece's axis of rotation, in contrast to drilling or boring processes using a rotating tool. The turning tool can be connected to a machine tool, such as a CNC lathe or other machine tool suitable for turning operations.

[0010] The coolant reflector may be disposed at the front end of the tool body of the turning tool. Thus, at least a portion of the coolant reflector may be attached to the front end. For example, a threaded member of the coolant reflector may be attached to a corresponding threaded member of the front end of the tool body. As another example, a portion of the coolant reflector including at least one through hole may be disposed relative to the front end, and the coolant reflector may then be connected to the front end by one or more screws or other fastening elements extending through the through hole and into a (threaded) hole formed in the front end of the tool body.

[0011] The cutting insert, or a seat for receiving the cutting insert, may be located at the forward end of the tool body, or more precisely, within the tool body at the interface between the forward end and the peripheral surface. It is also envisioned that the cutting insert, or a seat for receiving the cutting insert, may be located further rearward in the peripheral surface, but in any event closer to the forward end than the rearward end.

[0012] The coolant channels may extend through the tool body at least partially along the central axis of the tool body or along a direction parallel to the central axis of the tool body.

[0013] The outlet opening of the tool body (from which the coolant flows toward the reflecting structure) may be located at the front end of the tool body, e.g., at the central axis of the tool body. Thus, as one example, the outlet opening may be formed by a coolant channel formed coaxially with the central axis of the tool body, the coolant channel continuing linearly through the tool body to the outer surface of the front end of the tool body. As a further example, a coolant channel portion branching off from the coolant channel formed coaxially with the central axis of the tool body may open at the front end of the tool body at a position radially spaced from the central axis of the tool body. Multiple such coolant channel portions may branch off from the coolant channel. Thus, the tool body may include additional outlet openings in fluid communication with the coolant channel. Two or more of the outlet openings may be directed toward the reflecting structure. Alternatively, different outlet openings may be directed toward different reflecting structures. Multiple reflecting structures may be included in a single coolant reflector or in separate coolant reflectors disposed on the turning tool.

[0014] Thus, according to some embodiments, the tool body comprises two outlet openings with which the coolant channel is in fluid communication, and the coolant reflector comprises a separate reflective structure for each of the two outlet openings.

[0015] Not all outlet openings in fluid communication with the coolant channels need necessarily be directed toward the reflecting structure of the coolant reflector. Some openings can be positioned to direct coolant toward other regions of the tool body, such as directly toward the cutting insert or toward regions near the cutting insert. Coolant can also be directed partially rearward through openings in the peripheral surface of the tool body via branching coolant channel portions that extend from the coolant channels but are angled toward the rear end, so that the coolant exiting therefrom impinges on the wall of the machined hole at a location rearward of the cutting insert. Coolant directed in this manner can further improve chip evacuation from the hole.

[0016] The reflective structure may be located forward of the front end of the tool body. In other words, all components that make up the reflective structure may be located in front of the front end (even though other components of the coolant reflector may be located differently). This allows coolant received by the reflective structure to be reflected backward and toward the cutting insert, even when the cutting insert is disposed at the front end of the tool body.

[0017] As used herein, "rearward" when referring to the direction in which coolant is reflected does not necessarily refer to a direction straight toward the aft end of the tool body, but to any direction toward the aft end face, i.e., a plane through the aft end that is perpendicular to the central axis. In other words, the rearward direction should be understood as a direction that has at least a rearward component that is parallel to the central axis.

[0018] In this regard, it should be emphasized that the coolant reflector according to the present disclosure not only redirects the coolant from the forward axial direction toward the cutting element in a radially outward direction, but also in a rearward direction, i.e., in a direction at least slightly inclined relative to the radial direction toward the rear end face, and toward the cutting insert.

[0019] According to some embodiments, the coolant reflector extends radially relative to the central axis a distance that is smaller than the maximum radial extension of the tool body at the position along the central axis where the cutting insert or a seat for accommodating the cutting insert is located, in particular a distance that is smaller than the maximum radial extension of the tool body at the boundary between the peripheral surface and the front end.

[0020] Clearly, the coolant reflector must be located radially inward from the cutting edge of the cutting insert so as not to interfere with the cutting process. Having a radial extension smaller than the maximum radial extension of the peripheral surface of the tool body ensures that the coolant reflector does not limit the mobility of the turning tool in the radial direction, i.e., the maximum radial cutting depth is not affected by the presence of the coolant reflector. The radial distance that the coolant reflector extends may be smaller than the maximum radial extension of the tool body at any location along the central axis of the tool body, at least in the portion of the tool body intended to be located inside the bore during the internal turning process. Thus, the maximum width of the coolant reflector may be smaller than the maximum width of the tool body.

[0021] According to some embodiments, the reflective structure includes a surface that is oblique to the central axis and slopes rearward, thereby efficiently reflecting the coolant at least partially in a rearward direction. The surface may be flat or curved, or may include multiple segments that are partly flat and partly curved. According to some embodiments, the reflective structure includes a concave rearward-facing surface that may be particularly efficient at directing the coolant rearward. Such a concave surface may have a shape corresponding to, for example, the inner surface of a hemisphere or a portion of a sphere.

[0022] The reflective structure may be positioned to direct the coolant primarily toward the cutting insert or a seat for receiving the cutting insert. This is where chips form, and directing the coolant toward such locations may be beneficial for evacuating the chips. In other embodiments, the reflective structure may be positioned to evenly distribute the coolant around the peripheral surface of the tool body, i.e., around the periphery of the machined hole. This may be sufficient and even beneficial in some applications, as chips may end up remaining in various locations around the machined hole.

[0023] According to some embodiments, the coolant reflector includes a shaft extending axially between the forward end of the tool body and the reflecting structure, connecting the two. The shaft can include an internal conduit and be connected to the forward end of the tool body, allowing coolant exiting the tool body's outlet opening to flow through the shaft's internal conduit toward the reflecting structure. This can be achieved by directly connecting the shaft to the tool body's outlet opening, for example, via a threaded connection. The reflecting structure can have a concave, rearward-facing surface in the form of a hemispherical inner surface, and the shaft can be connected at the center of such hemispherical surface. This allows coolant received by the reflecting structure through the internal conduit in the shaft to be evenly distributed around the hemispherical surface and then flow further rearward toward the tool body and the cutting insert or a seat for accommodating the cutting insert. Alternatively, the reflecting structure can include specific geometric features, such as grooves, to direct the coolant primarily toward a specific point on its peripheral surface, for example, rearward toward the cutting insert.

[0024] According to another embodiment, the coolant reflector does not include any shaft, but instead includes a contact surface configured to be mounted flush against at least a portion of the front end of the tool body, and the reflecting structure is formed by a recess in the contact surface located such that the coolant exiting the outlet opening enters the recess. The recess is preferably formed at the boundary of the contact surface such that the recess forms a passage from the outlet opening of the tool body to the exterior of the tool body. The bottom of the recess may have a concave shape, for example formed as a part of a hemisphere, and is arranged such that the coolant received in the recess is reflected rearward and toward the cutting insert or a seat for accommodating the cutting insert. The recess configured to receive the coolant exiting the outlet opening of the tool body may have other shapes, for example formed by multiple segments of different shapes.

[0025] According to another embodiment, the reflecting structure includes at least one coolant reflecting channel having an inlet configured to receive the coolant flowing out of the outlet opening of the tool body and an outlet positioned to direct the coolant passing through the coolant reflecting channel at least partially rearward and toward the cutting insert or a seat for accommodating the cutting insert. This allows the coolant to be directed more precisely in a specific direction, preferably rearward, toward the cutting insert. The coolant reflecting channel can include first and second channel segments. The channel segments can be linear. The first channel segment extending from the inlet can extend primarily axially, while the second channel segment following the first channel segment and extending to the outlet can extend primarily radially but in a direction angled rearward, thereby directing the coolant flowing out of the outlet at least partially rearward and toward the cutting insert.

[0026] According to some embodiments, a turning tool includes two cutting inserts positioned on opposite sides of a peripheral surface. While both cutting inserts cannot be engaged simultaneously in the cutting process, such turning tools may improve productivity by allowing the inserts to be used sequentially in the cutting process, potentially reducing the number of tool changes required to machine a particular feature. In such embodiments, the reflective structures may be configured to reflect coolant in two specific directions, i.e., backward and toward each of the two cutting inserts, if not positioned to evenly distribute the coolant around the peripheral surface of the tool body. According to other embodiments, the coolant reflector may include two separate reflective structures, one reflective structure positioned to reflect coolant toward one of the cutting inserts and the other reflective structure positioned to reflect coolant toward the other cutting insert.

[0027] A chip space may be formed in the peripheral surface of the tool body adjacent to the seat for receiving the cutting insert. Furthermore, according to some embodiments, at least a portion of the peripheral surface of the tool body includes at least one chip flute. While chip flutes are not commonly used in turning tools, the inventors have found that the chip evacuation effect provided by the coolant reflector is further improved by having chip flutes disposed on the peripheral surface of the tool body of the turning tool. Such chip flutes may extend from the chip space located adjacent to the cutting insert toward the rear end of the tool body. The chip flutes do not have to extend to the rear end of the tool body, but extend as far as necessary to fully and efficiently evacuate chips from the hole. In the case of a turning tool having multiple cutting inserts, it is preferable to have one chip flute disposed for each cutting insert. The chip flutes may be straight, i.e., extend rearward along the peripheral surface in a direction parallel to the central axis, or may be helical, i.e., extend rearward in a spiral manner around the peripheral surface at a helix angle.

[0028] According to some embodiments, the coolant reflector is removably disposed on the tool body, whereby the coolant reflector can be selectively used only in applications where it is beneficial. In other applications, for example, when machining near the bottom of a hole (i.e., where the coolant reflector may limit tool accessibility), the coolant reflector can be removed.

[0029] According to another aspect, the present invention relates to a coolant reflector for use in a turning tool according to any of the embodiments disclosed herein, the coolant reflector being positionable at a forward end of a tool body of the turning tool and comprising a reflective structure arranged to receive coolant exiting an outlet opening of the tool body and to reflect the coolant at least partially rearwardly towards a cutting insert disposed within the tool body.

[0030] Thus, the present invention not only relates to a turning tool with a coolant reflector, but also to such a coolant reflector that can be manufactured as a separate unit adapted for selective use with a turning tool body.

[0031] The solution will now be explained in more detail by means of exemplary embodiments and with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0032] [Figure 1A] 1 shows a turning tool including a coolant reflector according to a first embodiment; [Figure 1B] 1 shows a turning tool including a coolant reflector according to a first embodiment; [Figure 1C] 1 shows a turning tool including a coolant reflector according to a first embodiment; [Figure 2A] 1 shows a turning tool including a coolant reflector according to a second embodiment. [Figure 2B] 1 shows a turning tool including a coolant reflector according to a second embodiment. [Figure 2C] 1 shows a turning tool including a coolant reflector according to a second embodiment. [Figure 3A] 10 shows a coolant reflector for a turning tool according to a third embodiment. [Figure 3B] 10 shows a coolant reflector for a turning tool according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] All figures are schematic and not necessarily to scale, generally showing only parts necessary to explain the respective embodiments, other parts may be omitted or merely suggested. Unless otherwise indicated, like reference symbols refer to like parts in different figures.

[0034] 1A-1C show a turning tool according to a first embodiment. FIG. 1A is a perspective view of the turning tool, and FIG. 1B is a side view. The turning tool comprises a tool body 1 having a front end 2 and a rear end 3. A central axis C extends longitudinally from the front end 2 to the rear end 3. The tool body 1 has two insert seats in which cutting inserts 5, 6 are mounted. The turning tool is for machining the interior of a hole in a rotating workpiece. The tool body comprises two chip flutes 20, one for each cutting insert, to facilitate the evacuation of chips from the machined hole towards the rear end. FIG. 1C is a front view of the turning tool looking along the central axis C towards the front end 2.

[0035] The coolant channel 9, shown in dashed lines in FIG. 1B, is formed by a first portion extending centrally within the tool body along the central axis C and two angled portions extending from the first portion toward respective outlet openings 11 (one of which is visible in FIG. 1A) in the front end 2.

[0036] The turning tool further includes a coolant reflector 12 disposed at the front end 2 of the tool body 1, with the bottom contact surface of the coolant reflector 12 positioned flush with the front end 2. The coolant reflector has two through-holes 21 (best seen in FIG. 1C ), through which the coolant reflector is connected to the tool body 1 using fastening elements such as screws (not shown). The coolant reflector has two reflective structures in the form of recesses 15 with concave, rearward-facing surfaces (only one of which is visible in FIGS. 1A and 1B ; both are shown in dashed lines in FIG. 1C ). The recesses 15 are disposed at the boundary of the contact surface of the coolant reflector, thus forming a passage for the coolant flowing out of the outlet 11. The coolant is thus received by the concave surfaces within the recesses 15 and at least partially reflected rearward toward the respective cutting inserts 5 and 6. Each concave, rearward-facing surface has the shape of a portion of the inner surface of a sphere.

[0037] 2A-2C show the front of a turning tool according to a second embodiment. FIG. 2A is a perspective view, and FIGS. 2B and 2C are side views from different directions. According to this second embodiment, a coolant reflector 13 is disposed at the front end of the tool body 1 in a manner corresponding to the embodiment shown in FIGS. 1A-1C, for example, using screws extending through holes 21 in the coolant reflector. The coolant reflector 13 is disposed flush with the front end of the tool body 1 and includes two reflective structures in the form of coolant reflecting channels 16 (one of which is shown in dashed lines in FIGS. 2B and 2C). Each coolant reflecting channel 16 has an inlet 18 and an outlet 19. The inlets 18 are positioned to receive coolant flowing from the outlet openings 11 of the coolant channels 9 inside the tool body 1. The outlet openings 11 are therefore positioned directly adjacent to the inlets 18, providing an uninterrupted flow of coolant from the coolant channels 9 in the tool body 1 to the coolant reflecting channels 16 in the coolant reflector. The outlets 19 of the coolant reflection channels 16 are arranged so that the coolant is directed therefrom at least partially rearwardly towards each of the cutting inserts 5, 6.

[0038] 2B and 2C, each coolant reflecting channel 16 comprises two channel segments: a first segment extending forward from an inlet 18 into the coolant reflector, and a second segment extending rearward from the first segment to an outlet 19. Such segments of the coolant reflecting channel may be formed by drilling. In other embodiments, the coolant reflecting channel 16 may be formed by a single curved channel, which may be achieved, for example, when manufacturing the coolant reflector by additive manufacturing methods.

[0039] 1A-1C, the coolant channel 9 in the tool body includes two separate angled portions 9′ (one of which is shown in FIGS. 2B and 2C) extending from a centrally extending portion to each outlet opening 11. Additionally, in this embodiment, the coolant channel 9 also includes two additional portions 9″ (one of which is shown in FIG. 2B) extending from the centrally extending portion of the coolant channel 9 to respective sets of sub-outlets 22, with each set 22 in the illustrated embodiment including three outlets. The coolant channel portion 9″ that carries coolant to the sub-outlets 22 extends to a hole 21 used to attach a coolant reflector to the tool body. The end section of the coolant channel portion 9" adjacent the front end 2 of the tool body 1 may be threaded so that a screw extending through the hole 21 into the portion 9" of the coolant channel 9 can in fact secure the coolant reflector to the front end of the tool body and close the open end of the coolant channel portion 9". This allows the coolant transported through the coolant channel 9 to exit from the outlet 19 of the coolant reflector (via the outlet opening 11 and the reflecting structure 16) and from the secondary outlet 22 of the tool body.

[0040] The secondary outlets 22 are positioned such that the coolant exiting therefrom is directed at least partially rearward into the chip flutes 20, thereby further improving the rearward evacuation of chips. For clarity, the portion 9" of the rearward-facing coolant channel 9 that directs coolant to the secondary outlets 22 is not shown in FIG. 2C, but is only shown in FIG. 2B.

[0041] Because the coolant reflector is removably positioned at the tip of the tool body, the coolant reflector may be selectively used only in those applications where it is appropriate. As an example, if the coolant reflector is removed but a screw or other means is still used to block the open end of the coolant channel portion 9″, the coolant conveyed through the coolant channel 9″ will flow forward through the outlet opening 11 and rearward through the secondary outlet 22, which may be beneficial in some applications, for example, when machining near the bottom of a closed hole (in which case the coolant reflector may get in the way and the bottom of the hole provides sufficient coolant reflection in any case). In other applications where it is desirable to increase the flow of coolant in the forward direction, the channel portion 9″ can be left open.

[0042] 3A-3B show a coolant reflector 14 according to a third embodiment of the present invention. FIG. 3A is a perspective view of the coolant reflector, and FIG. 3B is a side view of the front portion of the coolant reflector. The coolant reflector 14 may be disposed in a turning tool body similar to the tool bodies shown in the first and second embodiments, but the coolant channels in the tool body preferably include a portion that extends along the central axis all the way to the front end of the tool body. In other words, the coolant reflector 14 is preferably disposed in a coolant channel that emerges at the center of the front end of the tool body and is attached via a threaded connection onto the coolant reflector shaft 17. The outlet openings, through which the coolant channels in the tool body are in fluid communication, are directly connected to an internal conduit 24, shown in dashed lines in FIG. 3B, that extends through the shaft 17 of the coolant reflector 14.

[0043] The coolant reflector 14 includes a reflective structure in the form of a rearward-facing concave surface 25 .

[0044] Thus, during operation, coolant exiting the outlet openings of the coolant channels in the tool body is conveyed via conduit 24 to reflecting structure 25, from where it is at least partially reflected backwards towards one or more cutting inserts disposed in the tool body.

[0045] 1A-1C and 2A-2C, the coolant reflector 14 shown in FIGS. 3A-3B does not direct coolant specifically toward the cutting insert, but rather distributes coolant backward along the entire circumference of the machined hole (and thus at least partially toward the cutting insert). In many applications, this may not necessarily be a disadvantage, as chips that need to be evacuated may end up in various locations around the machined surface. Furthermore, a coolant reflector 14 such as that shown in FIGS. 3A-3B may be particularly easy to manufacture and versatile, as it can potentially be positioned on a variety of different turning tool bodies having different shapes.

[0046] The operation of a turning tool according to any of the embodiments disclosed herein is described below. To machine the inner surface of a hole in a workpiece, the turning tool is operated to engage the workpiece (not shown) while rotating the workpiece and moved in a feed direction, thereby machining the inner surface of the hole so that chips of workpiece material are formed. These chips need to be evacuated from the hole. When coolant is conveyed through coolant channels in the tool body during machining, the coolant is directed backward toward the cutting insert via the reflective structure. In addition to cooling the cutting insert, the coolant also helps evacuate the chips backward from the hole. Chip evacuation is further improved by the presence of chip flutes. The turning tool according to the illustrated embodiment includes two cutting inserts 5 and 6. The cutting inserts 5 and 6 do not simultaneously engage the workpiece. Instead, the turning tool can be used for different operations depending on which cutting insert is brought into contact with the workpiece (i.e., in which radial direction the tool engages the workpiece). For example, a first cutting insert 5 may be used when machining forward into a hole and a second cutting insert 6 may be used when machining backward out of the hole. In the embodiment shown herein, coolant is directed towards both cutting inserts 5 and 6 via the reflective structure, regardless of which of the cutting inserts is active.

[0047] While the above description contains a number of specificities, these should not be construed as limiting the scope of the concepts described herein, but rather as merely providing illustrations of a number of exemplary embodiments of the concepts described. It will be understood that the scope of the concepts described herein fully encompasses other embodiments that may become apparent to one of ordinary skill in the art, and thus the scope of the concepts described herein should not be limited.

Claims

1. A turning tool comprising a tool body (1), the tool body (1) comprising: a front end (2); a rear end (3); a peripheral surface (4) connecting the front end (2) and the rear end (3); a central axis (C) extending from the front end (2) to the rear end (3); The turning tool is a cutting insert (5, 6) or a seat for receiving the cutting insert (5, 6) arranged in said tool body (1); a coolant channel (9) extending at least partially through the tool body (1) for supplying coolant to the cutting inserts (5, 6), the coolant channel (9) being in fluid communication with an outlet opening (11) of the tool body; The turning tool further comprises a coolant reflector (12, 13, 14) including a reflecting structure (15, 16, 25) arranged to receive the coolant flowing out of the outlet opening (11) of the tool body (1) and to reflect the coolant at least partially backwards towards the cutting insert (5, 6).

2. 2. A turning tool according to claim 1, wherein the coolant reflector (12, 13, 14) is arranged at the front end (2) of the tool body (1).

3. 3. A turning tool according to claim 1 or 2, wherein the cutting insert (5, 6) or the seat for accommodating the cutting insert (5, 6) is arranged in the tool body (1) at the boundary between the front end (2) and the peripheral surface (4).

4. 4. The turning tool according to claim 1, wherein the tool body (1) comprises two outlet openings (11) with which the coolant channels (9) are in fluid communication, and the coolant reflector (12, 13, 14) comprises a separate reflecting structure (15, 16, 25) for each of the two outlet openings (11).

5. Turning tool according to any one of claims 1 to 4, wherein the reflecting structure (15, 16, 25) is located in front of the front end (2) of the tool body (1).

6. 6. The turning tool according to claim 1, wherein the coolant reflector (12, 13, 14) extends radially relative to the central axis (C) by a distance that is smaller than a maximum radial extension of the tool body (1) at a position along the central axis (C) at which the cutting insert (5, 6) or a seat for accommodating the cutting insert (5, 6) is located.

7. A turning tool according to any one of claims 1 to 6, wherein the reflective structures (15, 16) are oblique to the central axis (C) and include rearwardly sloping surfaces.

8. Turning tool according to any one of the preceding claims, wherein the reflective structure comprises a concave rearward facing surface (15, 25).

9. 9. The turning tool according to claim 1, wherein the coolant reflector (14) includes a shaft (17) extending in the axial direction between and connecting the front end of the tool body and the reflecting structure (15, 16, 25).

10. 10. The turning tool according to claim 1, wherein the reflecting structure comprises at least one coolant reflecting channel (16) having an inlet (18) configured to receive coolant flowing out of the outlet opening (11) of the tool body (1), and an outlet (19) positioned to direct coolant passing through the coolant reflecting channel (16) at least partially rearward and towards the cutting insert (5, 6) or the seat for accommodating the cutting insert (5, 6).

11. Turning tool according to any one of the preceding claims, wherein at least a part of the peripheral surface (4) of the tool body (1) is provided with chip flutes (20).

12. Turning tool according to any one of claims 1 to 11, wherein the coolant reflector (12, 13, 14) is removably arranged on the tool body (1).

13. 13. A coolant reflector (12, 13, 14) for use with a turning tool according to any one of claims 1 to 12, the coolant reflector (12, 13, 14) being positionable at a front end (2) of a tool body (1) of the turning tool, the coolant reflector (12, 13, 14) comprising a reflective structure (15, 16, 25) arranged to receive coolant flowing out of an outlet opening (11) in the tool body (1) and to reflect the coolant at least partially rearward and towards a cutting insert (5, 6) arranged in the tool body (1).

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