Coolant reflector and turning tool comprising same

Abstract

The invention relates to a coolant reflector (12, 13, 14) for a turning tool and to a turning tool comprising such a coolant reflector. The turning tool comprises a tool body (1) comprising a front end portion (2), a rear end portion (3), a peripheral surface (4) connecting the front end portion and the rear end portion, and a central axis (C) extending from the front end portion to the rear end portion. The turning tool further 5 comprises: a cutting insert (5, 6) or an insert seat for receiving a cutting insert arranged in the tool body; and a coolant channel (9) extending at least partially through the tool body (1) for supplying coolant to the cutting insert (5, 6), the coolant channel being in fluid communication with an exit opening (11) in the tool body. The coolant reflector comprises a reflective structure (15, 16, 25) arranged to receive coolant flowing out of the exit opening (11) in the tool body 10 (1) and to reflect the coolant at least partially rearward and towards the cutting insert (5, 6).

Description

Technical Field

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

[0002] In the field of metal cutting, a turning tool can be used to machine the surface of a rotating workpiece, such as the inner surface of a hole in the workpiece. In such a machining operation, the tool can extend along a central axis parallel to the axis of rotation of the workpiece.

[0003] When machining inside a hole in a rotating workpiece, if the generated chips remain inside the hole, the chips can have an adverse effect on the result of the machining process.

[0004] When machining inside a closed hole, the chips must be discharged in the same way as the turning tool enters the hole. Coolant is sometimes applied to the cutting zone, which can to some extent help to discharge the chips. EP1806191 discloses a turning tool having a chip groove for assisting in discharging chips, and in which coolant flows out of an opening in the front part of the turning tool, the opening being located on the side of the turning tool opposite to the blade seat. Thus, the main flow of coolant should travel towards the cutting blade and the chip groove via the bottom of the closed hole. However, this may not effectively discharge the chips in all applications, for example when machining a deep hole, where the distance between the cutting tool and the bottom of the hole is large. When machining inside an open hole, the chips may be discharged through an opening opposite to the location where the turning tool enters the hole. However, this may cause other problems, such as causing the coolant to spread in an uncontrolled manner to places where coolant is not required, such as eventually falling on the workshop floor.

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

[0006] The object of the present invention is to mitigate the deficiencies of the prior art and provide a turning tool in which improved chip discharge is achieved when machining inside a hole in a rotating workpiece. Another object of the present invention is to achieve a controlled distribution of the coolant of the turning tool in order to mitigate any adverse effects caused by the spread of the coolant in the machining environment.

[0007] Accordingly, in a first aspect, the present invention relates to a turning tool which comprises a tool body that includes a front end portion, a rear end portion, a peripheral surface connecting the front end portion and the rear end portion, and a central axis extending from the front end portion to the rear end portion. The turning tool further comprises: a cutting insert disposed in the tool body or a seat for receiving a cutting insert; and a coolant passage that at least partially extends through the tool body for supplying coolant to the cutting insert, the coolant passage being in fluid communication with a discharge opening in the tool body. The turning tool further comprises a coolant reflector that includes a reflecting structure arranged to receive coolant flowing out of the discharge opening in the tool body and reflect the coolant at least partially rearwardly and towards the cutting insert.

[0008] Thereby, the coolant is at least to some extent guided rearwardly towards the cutting insert, which, if machining is taking place inside a hole of a rotating workpiece, corresponds to the direction outwards from the machined hole. Thus, the chips produced are flushed out of the hole. This is particularly useful when machining is taking place in an open hole (through-hole) or a deep blind hole where there is no bottom surface of the hole to assist in redirecting the coolant towards the cutting insert and further discharging it from the hole.

[0009] A "turning tool" is to be understood as a cutting tool for machining a rotating workpiece. In the case of machining the inner surface of a hole in a rotating workpiece, such a tool is sometimes also referred to as a boring bar. The central axis of such a turning tool is parallel to, but usually not coaxial with, the rotational axis of the workpiece, and the turning tool can be moved radially within the hole to engage the surface of the workpiece. Thus, unlike drilling or boring using a rotating tool, different internal profiles of the hole can be machined by varying the radial displacement between the turning tool and the rotational axis of the workpiece. 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 can be arranged at the front end portion of the tool body of the turning tool. Thus, at least a part of the coolant reflector can be attached at the front end portion. For example, a threaded member of the coolant reflector can be attached to a corresponding threaded member at the front end portion of the tool body. As another example, a part of the coolant reflector that includes at least one through-hole can be arranged against the front end portion and then connected to the front end portion by extending one or more screws or other fastening elements through the through-hole and into a (threaded) hole formed in the front end portion of the tool body.

[0011] The cutting insert, or the insert seat for accommodating the cutting insert, may be located at the front end portion of the tool body, or more precisely, is arranged in the tool body at the junction between the front end portion and the peripheral surface of the tool body. It is also contemplated that the cutting insert or the insert seat for accommodating the cutting insert is positioned further rearward in the peripheral surface, but in any case is closer to the front end portion than the rear end portion.

[0012] The coolant channel 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 in the tool body (from which the coolant flows towards the reflector structure) may be located at the front end portion of the tool body, for example, at the position of the central axis of the tool body. Thus, for example, the outlet opening may be formed by a coolant channel coaxially formed with the central axis of the tool body, and this coolant channel continuously passes straight through the tool body until it reaches the outer surface at the front end portion of the tool body. As a further example, a coolant channel portion that is inclined with respect to the coolant channel coaxially formed with the central axis of the tool body and diverges from this coolant channel may open at a position radially separated from the central axis of the tool body in the front end portion of the tool body. A plurality of such coolant channel portions may diverge from the coolant channel. Thus, the tool body may include further outlet openings that are in fluid communication with the coolant channel. More than one outlet opening may point towards the reflector structure. Alternatively, different outlet openings may point towards different reflector structures. The plurality of reflector structures may be included in a single coolant reflector, or may be included in separate coolant reflectors arranged on the turning tool.

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

[0015] Not all outlet openings that are in fluid communication with the coolant channel necessarily point towards the reflector structure of the coolant reflector. Some openings may be arranged to direct the coolant towards other regions of the tool body, such as directly towards the cutting insert, or towards a region near the cutting insert. The coolant may also be partially directed rearward via an opening on the peripheral surface of the tool body, via a diverging coolant channel portion that extends from the coolant channel but is inclined towards the rear end portion, so that the coolant flowing out from there impacts the hole wall at a position behind the cutting insert of the machined hole. The coolant directed in this way can further improve the chip evacuation from the hole.

[0016] The reflecting structure can be located in front of the front end portion of the tool body. In other words, all parts constituting the reflecting structure can be located in front of the front end portion (even if other parts of the coolant reflector may be positioned in a different manner). Thereby, the coolant received by the reflecting structure can be reflected both backward and in the direction toward the cutting insert, even when the cutting insert is arranged at the front end portion of the tool body.

[0017] As used herein, the term "backward", when referring to the direction in which the coolant is reflected, is not necessarily the direction directly toward the rear end portion of the tool body, but rather refers to any direction toward the rear end plane, which is the plane passing through the rear end portion and perpendicular to the central axis. In other words, the backward direction should be understood as a direction having at least a component in the backward direction parallel to the central axis.

[0018] In this context, it should be emphasized that the coolant reflector according to the present disclosure does not merely redirect the coolant from the forward axial direction toward the cutting element to a radially outward direction, but redirects it both backward (i.e., at least slightly inclined relative to the radial direction to approach the rear end plane) and in the direction toward the cutting insert.

[0019] According to some embodiments, the coolant reflector extends radially relative to the central axis over a distance that is less than the maximum radial extension of the tool body at the location along the central axis where the cutting insert or the blade seat for accommodating the cutting insert is arranged, and in particular less than the maximum radial extension at the junction between the outer peripheral surface and the front end portion of the tool body.

[0020] Obviously, the coolant reflector must be located radially inside the cutting edge of the cutting insert so as not to interfere with the cutting process. By making the radial extension less than the maximum radial extension of the outer peripheral surface of the tool body, it is ensured that the coolant reflector will never limit the mobility of the turning tool in the radial direction, i.e., such that the maximum radial cutting depth will not be affected by the presence of the coolant reflector. The radial distance over which the coolant reflector extends can be less than the maximum radial extension of the tool body at any position along the central axis of the tool body, at least in the portion of the tool body intended to be positioned inside a hole in an internal turning process. Thus, the maximum width of the coolant reflector can be less than the maximum width of the tool body.

[0021] According to some embodiments, the reflection structure includes a surface that is angled with respect to a central axis and is inclined rearwardly. Thereby, the coolant will be effectively reflected in at least a partially rearward direction. The surface can be flat or curved, or include multiple segments, some of which are flat and some of which are curved. According to some embodiments, the reflection structure includes a rear-facing concave surface, which can be particularly effective in guiding the coolant rearward. For example, the shape of such a concave surface can correspond to the inner surface of a part of a hemisphere or a sphere.

[0022] The reflection structure can be arranged to direct the coolant mainly towards the cutting blade or towards the blade seat that houses the cutting blade. This is where chip formation occurs, and directing the coolant towards such a location can facilitate chip evacuation. In other embodiments, the reflection structure can be arranged to distribute the coolant evenly around the peripheral surface of the tool body, i.e., around the perimeter of the hole being machined. This can be sufficient or even beneficial in certain applications, as chips can end up in different locations around the perimeter of the hole being machined.

[0023] According to some embodiments, the coolant reflector includes a shaft that extends axially between the front end of the tool body and the reflection structure and connects the front end of the tool body to the reflection structure. The shaft can include an internal conduit and is connected to the front end of the tool body such that the coolant flowing out of the exit opening in the tool body passes through the internal conduit in the shaft towards the reflection structure. This can be achieved by directly connecting the shaft (e.g., via a threaded connection) to the exit opening in the tool body. The reflection structure can be a rear-facing concave surface in the form of the inner surface of a hemisphere, and the shaft can be connected at the center of such a hemispherical surface. Thereby, the coolant received at the reflection structure via the internal conduit in the shaft can be evenly distributed around the hemispherical surface and then further flow rearward towards the tool body and the cutting blade or towards the blade seat that houses the cutting blade. Alternatively, the reflection structure can include certain geometric features, such as grooves, for directing the coolant rearward mainly towards a specific point on the peripheral surface, e.g., towards the cutting blade.

[0024] According to other embodiments, the coolant reflector does not include any shaft, but includes a contact surface which is configured to be mounted flush with at least a part of the front end portion of the tool body, wherein the reflecting structure is formed by a recess in the contact surface, and the recess is positioned such that the coolant flowing out of the exit opening enters the recess. Preferably, the recess is formed at the boundary of the contact surface so that the recess forms a passage from the exit opening in the tool body to the outside of the tool body. The bottom of the recess may have a concave shape, for example, be formed as a part of a hemisphere, and is arranged such that the coolant received in the recess is reflected backward and toward the cutting blade or the blade seat for receiving the cutting blade. The recess arranged to receive the coolant flowing out of the exit opening in the tool body may also have other shapes and, for example, be formed by a plurality of segments having different shapes.

[0025] According to other embodiments, the reflecting structure includes at least one coolant reflecting channel having: an inlet arranged to receive the coolant flowing out of the exit opening in the tool body; and an outlet positioned to direct at least part of the coolant flowing through the coolant reflecting channel backward and toward the cutting blade or the blade seat for receiving the cutting blade. Thereby, the coolant can be more precisely directed backward along a specific direction, i.e., preferably toward the cutting blade. The coolant reflecting channel may include a first channel segment and a second channel segment. These channel segments may be straight. The first channel segment extending from the inlet may mainly extend in the axial direction, and the second channel segment following the first channel segment and extending to the outlet may mainly extend in the radial but backwardly inclined direction so that the coolant flowing out of the outlet is directed at least partly backward and toward the cutting blade.

[0026] According to some embodiments, a turning tool includes two cutting blades which are arranged on opposite sides of the peripheral surface. Although the two cutting blades cannot participate in the cutting process simultaneously, such a turning tool can provide higher productivity because the blades can be used sequentially in the cutting process, thereby reducing the number of tool changes required for machining a specific geometry. For such embodiments, if the reflecting structure is not arranged to evenly distribute the coolant around the peripheral surface of the tool body, the reflecting structure may be configured to reflect the coolant in two specific directions, i.e., backward and toward each of the two cutting blades. According to other embodiments, the coolant reflector may include two separate reflecting structures, wherein one reflecting structure is arranged to reflect the coolant toward one of the cutting blades, and the other reflecting structure is arranged to reflect the coolant toward the other cutting blade.

[0027] A chip space may be formed in the peripheral surface of the tool body and adjacent to the insert seat for accommodating the cutting insert. Additionally, according to some embodiments, at least a portion of the peripheral surface of the tool body includes at least one chip groove. Chip grooves are not typically used on turning tools, but the present inventors have found that by arranging chip grooves on the peripheral surface of the tool body of a turning tool, the chip evacuation effect provided by the coolant reflector can be further enhanced. Such a chip groove may extend from the chip space located near the cutting insert towards the rear end portion of the tool body. The chip groove may not extend all the way to the rear end portion of the tool body, but only as far as is effective to evacuate the chips from the hole. For a turning tool having multiple cutting inserts, preferably, one chip groove is arranged for each cutting insert. The chip groove may be straight, i.e., extending rearward along the peripheral surface in a direction parallel to the central axis, or the chip groove may be helical, i.e., extending helically around the peripheral surface rearward at a certain helix angle.

[0028] According to some embodiments, the coolant reflector is arranged at the tool body in a detachable manner. Thereby, the coolant reflector can be selectively used only in applications where it is beneficial. For other applications, such as when machining near the bottom surface of the hole (i.e., where the coolant reflector may limit the accessibility of the tool), the coolant reflector can be removed.

[0029] According to another aspect, the present invention relates to a coolant reflector for a turning tool according to any one of the embodiments disclosed herein, wherein the coolant reflector may be arranged at the front end portion of the tool body of the turning tool and includes a reflecting structure that is arranged to receive the coolant flowing out of the outlet opening in the tool body and reflect the coolant at least partially rearward and towards the cutting insert arranged in the tool body.

[0030] Thus, the present invention relates not only to a turning tool including a coolant reflector, but also to such a coolant reflector that can be manufactured as a separate unit, the separate unit being adapted to be selectively used together with the turning tool body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The solution will now be described in more detail by way of exemplary embodiments and with reference to the drawings, in which:

[0032] Figures 1A to 1C A turning tool including a coolant reflector according to a first embodiment is shown.

[0033] Figures 2A to 2C A turning tool including a coolant reflector according to a second embodiment is shown.

[0034] Figures 3A to 3BShows a coolant reflector for a turning tool according to a third embodiment.

[0035] All the figures are schematic, not necessarily drawn to scale, and generally show only parts necessary for elucidating the respective embodiments, while other parts may be omitted or only suggested. Unless otherwise stated, the same reference numerals denote the same parts in different figures. Detailed Description

[0036] Figures 1A to 1C Shows a turning tool according to a first embodiment. Figure 1A is a perspective view of the turning tool, and Figure 1B is a side view. The turning tool includes a tool body 1 having a front end portion 2 and a rear end portion 3. A central axis C extends longitudinally from the front end portion 2 to the rear end portion 3. The tool body 1 has two blade seats, and cutting blades 5, 6 are mounted in the two blade seats. The turning tool is intended for internal machining of the interior of a hole in a rotating workpiece. The tool body includes two chip grooves 20, one for each cutting blade, to facilitate discharging chips from the machined hole toward the rear end portion. Figure 1C is a front view of the turning tool seen along the central axis C toward the front end portion 2.

[0037] The coolant passage 9 is Figure 1B shown in dashed lines and is formed by a first portion and two inclined portions. The first portion extends centrally within the tool body along the central axis C, and the two inclined portions extend from the first portion toward respective outlet openings 11 in the front end portion 2 ( Figure 1A one of the outlet openings is visible therein).

[0038] The turning tool further includes a coolant reflector 12, which is arranged at the front end portion 2 of the tool body 1 such that the bottom contact surface of the coolant reflector 12 is positioned flush with the front end portion 2. The coolant reflector has two through holes 21 (most clearly visible in Figure 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 reflecting structures in the form of recesses 15, which have concave surfaces facing rearward (only one of the reflecting structures is visible in Figure 1A and Figure 1B , and both reflecting structures are shown in dashed lines in Figure 1C ). The recesses 15 are arranged at the boundary of the contact surface of the coolant reflector, thereby forming a passage for the coolant flowing out from the outlet 11. Thus, the coolant will be received on the concave surface in the recess 15 and at least partially reflected rearward and toward the respective cutting blades 5 and 6. Each concave surface facing rearward has the shape of a part of the inner surface of a sphere.

[0039] Figures 2A to 2C Shows the front part of a turning tool according to a second embodiment. Figure 2A is a perspective view, and Figure 2B and Figure 2C are side views seen from different directions. According to this second embodiment, the coolant reflector 13 is arranged at the front end portion of the tool body 1 in a manner corresponding to the embodiment shown in Figures 1A to 1C , for example, by using screws extending through the holes 21 in the coolant reflector. The coolant reflector 13 is arranged flush with the front end portion of the tool body 1 and includes two reflecting structures in the form of coolant reflecting channels 16 ( Figure 2B and Figure 2C shows one of the reflecting structures in dashed lines). Each coolant reflecting channel 16 has an inlet 18 and an outlet 19. The inlet 18 is arranged to receive the coolant flowing out from the outlet opening 11 of the coolant channel 9 within the tool body 1. Thus, the outlet opening 11 is arranged directly adjacent to the inlet 18, thereby providing an uninterrupted coolant flow from the coolant channel 9 in the tool body 1 to the coolant reflecting channel 16 in the coolant reflector. The outlet 19 of the coolant reflecting channel 16 is arranged such that: the coolant is guided at least partially backward and toward the corresponding cutting insert among the cutting inserts 5, 6 from the outlet 19.

[0040] As Figure 2B and Figure 2C shown, each coolant reflecting channel 16 includes two channel segments - the first segment extends forward from the inlet 18 to the coolant reflector, and the second segment extends backward from the first part to the outlet 19. These segments of the coolant reflecting channel can be formed by drilling. In other embodiments, the coolant reflecting channel 16 can be formed by a single curved channel, for example, if the coolant reflector is manufactured by an additive manufacturing method, such a single curved channel can be achieved.

[0041] Similar to Figures 1A - 1C in the embodiment shown, the coolant channel 9 in the tool body includes two separate inclined portions 9' ( Figure 2B and 2C shows one of them) extending from the centrally extending portion to the corresponding outlet opening 11. In addition, in this embodiment, the coolant channel 9 further includes two additional portions 9'' ( Figure 2BOne of them is shown in FIG. The additional part 9’’ extends from the central extending part of the coolant channel 9 to the corresponding group of auxiliary outlets 22, and each group of auxiliary outlets 22 includes three outlets in the illustrated embodiment. The coolant channel part 9’’ for delivering coolant to the auxiliary outlets 22 extends to the hole 21 for mounting the coolant reflector to the tool body. The end section of the coolant channel part 9’’ adjacent to the front end 2 of the tool body 1 can be threaded, so that the screw extending through the hole 21 and into the part 9’’ of the coolant channel 9 can actually both fix the coolant reflector to the front end of the tool body and close the open end of the coolant channel part 9’’. Thus, the coolant delivered through the coolant channel 9 will flow out from the outlet 19 of the coolant reflector (via the outlet opening 11 and the reflecting structure 16) and the auxiliary outlets 22 in the tool body.

[0042] The auxiliary outlets 22 are arranged such that the coolant flowing out from the auxiliary outlets 22 is at least partially guided backward into the chip groove 20. This will further improve the backward discharge of the chips. For clarity, the part 9’’ of the coolant channel 9 for delivering coolant to the auxiliary outlets 22 is not shown in Figure 2C but is only shown in Figure 2B FIG.

[0043] Since the coolant reflector is arranged at the front end of the tool body in a detachable manner, the coolant reflector can be selectively used only in the applications where it is suitable. For example, if the coolant reflector is removed, but the open end of the coolant channel part 9’’ is still plugged with a screw or other means, the coolant delivered through the coolant channel 9 will flow forward from the outlet opening 11 and backward from the auxiliary outlets 22, which can be beneficial in some applications, such as when machining near the bottom of the closed hole (in this case, the coolant reflector may form an obstruction, and the bottom surface of the hole will provide sufficient coolant reflection effect anyway). In other applications, when an increase in the coolant flow rate in the forward direction is required, the channel part 9’’ can be kept open.

[0044] Figures 3A to 3B A coolant reflector 14 according to the third embodiment of the present invention is shown. Figure 3A is a perspective view of the coolant reflector, and Figure 3BIt is a side view of the front part of the coolant reflector. The coolant reflector 14 can be arranged in a similar manner to the tool body shown in the first and second embodiments, but preferably, the coolant channels in the tool body include a part that extends along the central axis all the way to the front end of the tool body. In other words, preferably, the coolant reflector 14 is arranged in the coolant channel that discharges at the center of the front end of the tool body and is installed via a threaded connection on the shaft 17 of the coolant reflector. Thus, the outlet opening that is in fluid communication with the coolant channel in the tool body will be directly connected to the internal through-channel 24 that extends through the shaft 17 of the coolant reflector 14 ( Figure 3B shown in dashed lines).

[0045] The coolant reflector 14 includes a reflecting structure in the form of a concave surface 25 facing backward.

[0046] Therefore, in operation, the coolant flowing out from the outlet opening of the coolant channel in the tool body will be conveyed via the channel 24 to the reflecting structure 25 and be at least partially reflected backward and toward one or more cutting inserts arranged on the tool body from there.

[0047] Compared with Figures 1A to 1C and Figures 2A to 2C the embodiments shown in Figures 3A to 3B the coolant reflector 14 shown in Figures 3A to 3B will not specifically direct the coolant toward the cutting inserts, but will distribute the coolant backward along the perimeter of the hole being machined (and thus at least partially toward the cutting inserts). For many applications, this may not necessarily be a disadvantage because the chips to be discharged can eventually fall at different positions around the machined surface. In addition, the coolant reflector 14 shown in

[0048] In the following, the operation of a turning tool according to any one of the embodiments disclosed herein will be described. To machine the inner surface of a hole in a workpiece, the turning tool is operated to engage the workpiece and move in the feed direction while the workpiece (not shown) rotates, thereby machining the inner surface of the hole and forming chips of the workpiece material. These chips need to be discharged from the hole. If coolant is conveyed through a coolant passage within the tool body during machining, the coolant will be directed backward toward the cutting inserts via a reflecting structure. Thus, in addition to cooling the cutting inserts, the coolant will also assist in discharging the chips backward out of the hole. The presence of the chip grooves further improves chip evacuation. The turning tool according to the illustrated embodiment includes two cutting inserts 5 and 6. The cutting inserts 5 and 6 will not engage the workpiece simultaneously. Instead, the turning tool can be used for different operations, depending on which cutting insert forms contact with the workpiece (i.e., in which radial direction the tool engages the workpiece). For example, when machining into the hole in the forward direction, the first cutting insert 5 can be used, while when machining out of the hole in the backward direction, the second cutting insert 6 can be used. In the embodiment shown herein, regardless of which cutting insert is in the working state, the coolant will be directed toward both cutting inserts 5 and 6 via the reflecting structure.

[0049] Although the foregoing description contains many specific details, these specific details should not be construed as limiting the scope of the concepts described herein, but rather as merely providing illustrations of some exemplary embodiments of the concepts. It will be understood that the scope of the presently described concepts fully encompasses other embodiments that may become obvious to those skilled in the art, and thus, the scope of the presently described concepts is not limited.

Claims

1. A turning tool, the turning tool comprising a tool body (1), the tool body (1) comprising - a front end portion (2), - a rear end portion (3), - an outer peripheral surface (4) connecting the front end portion (2) and the rear end portion (3), and - a central axis (C) extending from the front end portion (2) to the rear end portion (3); Among them, The turning tool further comprises - cutting inserts (5, 6) or a seat for receiving the cutting inserts (5, 6), the cutting inserts or the seat being arranged in the tool body (1); And - a coolant channel (9) at least partially extending through the tool body (1) for supplying coolant to the cutting inserts (5, 6), the coolant channel (9) being in fluid communication with a discharge opening (11) in the tool body; Wherein the turning tool is characterized in that it further comprises coolant reflectors (12, 13, 14), the coolant reflectors comprising a reflecting structure (15, 16, 25), the reflecting structure being arranged to receive the coolant flowing out of the discharge opening (11) in the tool body (1) and to reflect the coolant at least partially rearward and towards the cutting inserts (5, 6).

2. The turning tool according to claim 1, wherein the coolant reflectors (12, 13, 14) are arranged at the front end portion (2) of the tool body (1).

3. The turning tool according to any one of the preceding claims, wherein the cutting inserts (5, 6) or the seat for receiving the cutting inserts (5, 6) is arranged in the tool body (1) at the junction between the front end portion (2) and the outer peripheral surface (4).

4. The turning tool according to any one of the preceding claims, wherein the tool body (1) comprises two discharge openings (11) in fluid communication with the coolant channel (9), and the coolant reflectors (12, 13, 14) comprise separate reflecting structures (15, 16, 25) for each of the two discharge openings (11).

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

6. The turning tool according to any one of the preceding claims, wherein, Relative to the central axis (C), the coolant reflectors (12, 13, 14) extend radially a distance less than the maximum radial extension of the tool body (1) at the position along the central axis (C) where the cutting inserts (5, 6) or the seat for receiving the cutting inserts (5, 6) is arranged.

7. The turning tool according to any one of the preceding claims, wherein the reflecting structure (15, 16) comprises a surface inclined at an oblique angle relative to the central axis (C) and inclined rearward.

8. A turning tool according to any one of the preceding claims, wherein the reflecting structure includes a rear-facing concave surface (15, 25).

9. A turning tool according to any one of the preceding claims, wherein the coolant reflector (14) includes a shaft (17) that extends in the axial direction between the front end portion of the tool body and the reflecting structure (15, 16, 25) and connects the front end portion of the tool body and the reflecting structure (15, 16, 25).

10. A turning tool according to any one of the preceding claims, wherein the reflecting structure includes at least one coolant reflecting channel (16) having: an inlet (18) arranged to receive coolant flowing out of the exit opening (11) in the tool body (1); and an outlet (19) positioned to reflect at least part of the coolant flowing through the coolant reflecting channel (16) rearward and toward the cutting insert (5, 6) or the insert seat for receiving the cutting insert (5, 6).

11. A 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) includes a chip groove (20).

12. A turning tool according to any one of the preceding claims, wherein the coolant reflector (12, 13, 14) is arranged on the tool body (1) in a detachable manner.

13. A coolant reflector (12, 13, 14) for a turning tool according to any one of claims 1 - 12, wherein the coolant reflector (12, 13, 14) is capable of being arranged at the front end portion (2) of the tool body (1) of the turning tool and includes a reflecting structure (15, 16, 25) arranged to receive coolant flowing out of the exit opening (11) in the tool body (1) and reflect the coolant at least partially rearward and toward the cutting insert (5, 6) arranged in the tool body (1).

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