CUTTING TOOL AND METHOD FOR PRODUCE A MACHINE-MACHINED PRODUCT

Abstract

A cutting tool (1a, 1b), comprising: a main body (3) with a rod shape extending along a central axis (X1) from a first end (3a) to a second end (3b), wherein the main body (3) a cutting edge (11) which is arranged to project laterally from the first end (3a), a first flow path (15) which is arranged along the central axis (X1) and has an inlet opening (23), a second flow path (17) whose inner diameter is smaller than that of the first flow path (15), wherein the second flow path (17) is arranged from the first flow path (17) to the first end (3a) along the central axis (X1), a third flow path (19) which is connected to the first flow path (15) and has a first outflow opening (25), and a fourth flow path (21) which is connected to the second flow path (17) and has a second outflow opening (27), and the first outlet opening (25) is further away from an imaginary plane (S) that has the central axis (X1) and the cutting edge (11) than the second outlet opening (27), wherein the first outflow opening (25) opens in the direction above the cutting edge (11), wherein the second outflow opening (27) opens towards the cutting edge (11) and where part of the second outlet opening (27) is contained in the imaginary plane (S).

Description

TECHNICAL AREA

[0001] The present embodiments generally relate to cutting inserts for use in a cutting process, in particular cutting tools for use in machining internal diameters and especially drill inserts.

[0002] For example, a drill insert described in JP 2007 - 075 933 A and a cutting tool described in JP 2001 - 087 906 A are known as a cutting tool used in performing a cutting operation of an inner diameter of a workpiece, such as metal.

[0003] JP 2007 - 075 933 A describes the cutting tool in which a spray opening of a coolant hole arranged in a shank is inclined towards a cutting edge in a top view. JP 2001 - 087 906 A describes the cutting tool with a first nozzle for spraying coolant towards an upper side surface of an insert and a second nozzle for spraying the coolant towards the chips.

[0004] Furthermore, a cutting tool is known from US 2013 / 0028669A1, comprising: a main body with a rod shape extending along a central axis from a first end to a second end, wherein the main body has: a cutting edge arranged to project laterally from the first end, a first flow path arranged along the central axis and having an inlet opening, a second flow path whose inner diameter is smaller than that of the first flow path, wherein the second flow path is arranged along the central axis from the first flow path to the first end, a third flow path connected to the first flow path and having a first outlet opening, and a fourth flow path connected to the second flow path and having a second outlet opening.

[0005] Another cutting tool with flow paths is known from JP H06 - 57 503 U.

[0006] It is an object of the present invention to cool a cutting tool more effectively in the area of ​​a cutting edge. BRIEF EXPLANATION

[0007] The problem is solved by a cutting tool with the features according to claim 1. The problem is further solved by a method for producing a machined product with the features according to claim 9. Further embodiments of the cutting tool are described in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view showing a cutting tool in one of the embodiments, Fig. 2 is an enlarged view of an area A1, which is in Fig. 1 is shown, Fig. Figure 3 is a perspective view of a flow path in the cutting tool, which is located in Fig. 1 is shown, Fig. 4 is an enlarged view of an area A2, which is in Fig. 3 is shown, Fig. 5 is a front view of the in Fig. 1 cutting tool shown, when viewed in the direction of a first end, Fig. 6 is a side view of the in Fig. 5 shown cutting tool, when viewed from a B1 direction, Fig. 7 is an enlarged view of one in Fig. 6 of the depicted area A3, Fig. Figure 8 is a perspective view of a flow path in the cutting tool, which is located in Fig. 7 is shown, Fig. 9 is a side view of the in Fig. 5 of the cutting tool shown, when viewed from a B2 direction, Fig. 10 is an enlarged view of an A4 area, which is in Fig. 9 is shown, Fig. Figure 11 is a perspective view of a flow path in the cutting tool, which is located in Fig. 10 is shown, Fig. Figure 12 is a side view showing a cutting tool in one of the embodiments, Fig. 13 is an enlarged view of an A5 area, which is in Fig. 12 is shown, Fig. Figure 14 is a perspective view of a flow path in the cutting tool, which is located in Fig. 13 is shown, Fig. 15 is a side view of the in Fig. 12 shown cutting tool, when viewed from a different direction, Fig. 16 is an enlarged view of one in Fig. 15 of the area shown, A6, Fig. Figure 17 is a perspective view of a flow path in the cutting tool, which is in Fig. 16 is shown, Fig. Figure 18 is a schematic representation showing one of the steps in a process for manufacturing a machined product in one of the embodiments, Fig. Figure 19 is a schematic representation showing one of the steps of the process for manufacturing a machined product in the embodiment, and Fig. Figure 20 is a schematic representation showing one of the steps of the process for manufacturing a machined product in the embodiment. EXECUTION FORMS

[0008] The cutting tool described in patent document 2 is the tool used to perform a cutting operation on the outer diameter of a workpiece. Therefore, the cutting tool described in patent document 2 has a high degree of freedom with respect to the position of the outlet openings in the first and second nozzles and with respect to the extension direction of the first and second nozzles.

[0009] The tool used to perform the cutting operation of the workpiece's inner diameter, such as the cutting tool described in patent document 1, is used in a state where it is inserted into a bore in the workpiece. Therefore, the tool has limited freedom with respect to the position of a coolant outlet and the direction of the coolant hole's extension. Consequently, it is difficult to adequately remove chips and efficiently cool the cutting edge using coolant.

[0010] Cutting tools in a variety of embodiments are described individually below with reference to the drawings. For descriptive purposes, only the main elements necessary for describing the embodiments are shown in simplified form in the drawings mentioned below. The cutting tools may therefore have any structural element not depicted in the aforementioned drawings. The dimensions of the elements in each of the drawings are those that do not accurately represent either the dimensions of the actual structural elements or the dimensional ratios of these elements. <schneidwerkzeuge>

[0011] As a cutting tool in one of the embodiments, the cutting tool 1a for use in an internal groove cutting process is shown and described below. The cutting tool 1a in the Fig. The embodiment shown in Figure 1 has a main body 3 with a rod shape, extending from a first end 3a to a second end 3b along a central axis X1. Generally, the first end 3a is referred to as a "front end" and the second end 3b as a "rear end". The main body 3 can be configured to extend from the first end 3a to the second end 3b and can, for example, have a columnar or prismatic shape.

[0012] The main body 3 can be formed from one or more elements. The cutting tool 1a, which has the main body 3 formed from a single element, is generally referred to as the "solid material type". The main body 3 in the Fig. The embodiment shown in Figure 1 is formed by the multitude of elements. In particular, the main body 3 in the Fig. The embodiment shown in Figure 2 has a holder 5, an insert 7 and a fastening element 9.

[0013] The holder 5 can have a rod shape extending from the first end 3a to the second end 3b along the central axis X1, as shown in Fig. 1. The outer diameter of the holder 5 can be kept constant or changed. In the embodiment shown in Fig. In the embodiment shown in Figure 1, the holder 5 is formed from a small-diameter part 5a and a large-diameter part 5b. The small-diameter part 5a is located on one side of the first end 3a and has a relatively small outer diameter. The large-diameter part 5b is located closer to one side of the second end 3b than the small-diameter part 5a and has a relatively large outer diameter.

[0014] The insert 7 can be positioned on one side of the first end 3a in the holder 5. The insert 7 is located with one end face on the side of the first end 3a in the holder 5 in the Fig. 2. The illustrated embodiment is in contact.

[0015] For example, steel, cast iron, and aluminum alloy can be used as elements forming the holder 5. The dimensions of the holder 5 can be appropriately defined according to the dimensions of a workpiece. For example, the length of the holder 5 in one direction along the central axis X1 can be set to approximately 60 mm or more, but 200 mm or less. Its width in one direction orthogonal to the central axis X1 can be set to approximately 6 mm or more, but 50 mm or less.

[0016] An end surface 7a and a surface arranged on one side opposite end surface 7a in the insert 7 can be arranged as in the Fig. 2. The embodiment shown has an approximately circular disk shape. The insert 7 can have a through-hole 7b that opens into the end surface 7a and the surface on the side opposite the end surface 7a, as shown in the Fig. 2 depicted embodiment.

[0017] One form of deployment 7 is not based on one in Fig. The configuration shown in Figure 2 is limited. For example, the end surface 7a and the surface located on the side of the insert 7 opposite end surface 7a can have a polygonal plate shape with an approximate polygonal shape. The insert 7 can have a rod shape extending in one direction orthogonal to the central axis X1 of the holder 5. The rod-shaped insert 7 is sometimes referred to as the "dogbone type".

[0018] For example, cemented carbide or cermet can be used as a material for an element forming insert 7. Examples of cemented carbide compositions are WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and then sintering. WC-TiC-Co is produced by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co is produced by adding tantalum carbide (TaC) to WC-TiC-Co.

[0019] Cermet is a sintered composite material obtained by combining metal and a ceramic component. Examples of cermet include those primarily composed of a titanium compound, such as titanium carbide (TiC) or titanium nitride (TiN).

[0020] Fastening element 9 is the element for attaching the insert 7 to the holder 5. Fastening element 9 is located in the Fig. In the embodiment shown in Figure 2, a screw 9 is used. The fastening element 9 is not limited to the screw 9, but can, for example, be a clamping element. The insert 7 has the through-hole 7b as described above, and the holder 5 has a screw hole (not shown) at a location corresponding to the through-hole 7b in the Fig. 2 corresponds to the embodiment shown.

[0021] The insert 7 can be attached to the holder 5 by inserting the screw 9 into the through hole 7b of the insert 7 and screwing the screw 9 into the screw hole of the holder 5. The through hole 7b and the screw hole are located in the Fig. 2 in the embodiment shown, extended in the direction of the central axis X1.

[0022] The main body 3 has a cutting edge 11 which is arranged to project laterally from the first end 3a. A cutting operation can be carried out by bringing the cutting edge 11 into contact with the workpiece. The cutting edge 11 is furthest from the central axis X1 on the side of the first end 3a of the main body 3 in a Fig. In the embodiment shown in Figure 5, the cutting edge 11 is arranged remotely. Since the cutting edge 11 projects laterally, it is possible to bring only a portion of the cutting edge 11 in the main body 3 into contact with the workpiece. The insert 7 in the main body 3 has the cutting edge 11 in the position shown in Figure 5. Fig. 5 depicted embodiment.

[0023] The main body 3 also has a flow path 13 arranged therein. The flow path 13 is able to serve as a component that allows coolant to pass through during the use of the cutting tool 1a. The holder 5 in the main body 3 has in the Fig. In the embodiment shown in Figure 3, the flow path 13 is shown.

[0024] Flow path 13 indicates in the Fig. In the embodiment shown in Figure 3, a first flow path 15, a second flow path 17, a third flow path 19, and a fourth flow path 21 are provided. The first flow path 15 is arranged along the central axis X1 and has an inlet opening 23 for the coolant. The first flow path 15 is located on the side of the second end 3b in the main body 3 and extends in the Fig. 3. In the illustrated embodiment, straight along the central axis X1.

[0025] The coolant inlet opening 23 is located on the end surface on the side of the second end 3b in the main body 3 in the Fig. 3 as shown in the embodiment. The position of the inlet opening 23 for the coolant is not limited to the end surface, but can, for example, be arranged on an outer circumferential surface of the main body 3.

[0026] The second flow path 17 extends from the first flow path 15 towards the first end 3a and is arranged along the central axis X1. In the Fig. In the embodiment shown in Figure 4, the second flow path 17 is arranged closer to the side of the first end 3a in the main body 3 than the first flow path 15 and extends in a straight line along the central axis X1.

[0027] In the Fig. In the embodiment shown in Figure 4, the inner diameter of the second flow path 17 is smaller than the inner diameter of the first flow path 15. Since the inner diameter of the second flow path 17 is smaller than the inner diameter of the first flow path 15, it is therefore possible to increase the fluid pressure of the coolant that is expelled from a first outlet opening 25 and a second outlet opening 27, which will be described later.

[0028] The third flow path 19 is connected to the first flow path 15 and has the first outflow opening 25. In the Fig. In the embodiment shown in Figure 4, the first outlet opening 25 is arranged on an outer circumferential surface of the main body 3. The third flow path 19 can extend in a straight line, as shown in Figure 4. Fig. 4 of the embodiment shown. The first outlet opening 25 can serve as an area for expelling the coolant in the direction of the chips produced by the cutting edge 11.

[0029] In cases where the holder 5 is formed from the small diameter part 5a and the large diameter part 5b, as in the Fig. In the embodiment shown in Figure 2, the first outlet opening 25 can be arranged so that it lies over the small diameter part 5a and the large diameter part 5b.

[0030] The fourth flow path 21 is connected to the second flow path 17 and has the second outflow opening 27. The second outflow opening 27 is located on an outer circumferential surface of the main body 3 in the Fig. 4 as shown in the embodiment. As in the Fig. In the embodiment shown in Figure 4, the fourth flow path 21 can extend in a straight line. The second outlet opening 27 can serve as an area for expelling the coolant in the direction of the chips produced by the cutting edge 11.

[0031] The first outlet opening 25 is located further away from an imaginary plane S, which has the central axis X1 and the cutting edge 11, than the second outlet opening 27. The imaginary plane S denotes the plane which has the central axis X1 and the cutting edge 11, as shown in Fig. Figure 5 shows the central axis X1 overlapping the imaginary plane S in a state where the cutting edge 11 overlaps the central axis X1, as shown in Fig. 7 and Fig. 8 shown.

[0032] Since the first outlet opening 25 and the second outlet opening 27 have the positional relationship described above, the chips can be discharged appropriately and the cutting edge 11 can be cooled efficiently. This is because the coolant discharged from the first outlet opening 25 is less likely to collide with the coolant discharged from the second outlet opening 27 when the coolant from the first outlet opening 25 is discharged in the direction of the chips, and when the coolant from the second outlet opening 27 is discharged in the direction of the cutting edge 11.

[0033] If, in particular, part of the second outlet opening 27 lies in the imaginary plane S, the probability that the coolant expelled from the first outlet opening 25 collides with the coolant expelled from the second outlet opening 27 is significantly lower.

[0034] Even if the first outlet opening 25 is further away from the central axis X1 than the second outlet opening 27 in a front view from a direction orthogonal to the imaginary plane S, it is much less likely that the coolant expelled from the first outlet opening 25 will collide with the coolant expelled from the second outlet opening 27.

[0035] The coolant is supplied to the first flow path 15 from the inlet opening 23. The coolant supplied to the first flow path 15 passes through the third flow path 19 and is discharged from the first outlet opening 25. The coolant supplied to the first flow path 15 passes through the fourth flow path 21 and is discharged from the second outlet opening 27.

[0036] Alternatively, the coolant can be supplied not only via the inlet opening 23, but also via a section other than the inlet opening 23. The coolant can be supplied not only via the first outlet opening 25 and the second outlet opening 27, but also from a section other than these outlet openings.

[0037] The coolant is formed, for example, from water-insoluble or water-soluble cutting fluid and can be selected according to the workpiece material. Examples of water-insoluble cutting fluids include oil-based, inert, and high-pressure cutting fluids. Examples of water-soluble cutting fluids include emulsion, soluble, and solution-type fluids. Alternatively, the coolant can be gaseous, such as an inert gas, instead of liquid.

[0038] The shape of the flow path 13 is not particularly restricted, as long as it allows the passage of the coolant. In one embodiment, the first flow path 15, the second flow path 17, the third flow path 19, and the fourth flow path 21 have a circular shape in the sense of a cross-section orthogonal to the flow direction of the coolant. The cross-sectional shape of the flow path 13 can, for example, be elliptical or polygonal. The inner diameter of the flow path 13 can, for example, be 1 mm or more, but 10 mm or less.

[0039] The flow path 13 can be formed by drilling a hole through an element serving as the main body 3 using a drill or similar tool. A portion of the resulting hole, not serving as the flow path 13, can be sealed by a sealing element (not shown) to prevent coolant leakage. Examples of sealing elements include solder, resin elements, and screw elements.

[0040] In flow path 13 in the Fig. In the embodiment shown in Figure 3, the inner diameter of the second flow path 17 is smaller than the inner diameter of the first flow path 15. This makes it easier to ensure that the first outlet opening 25 of the third flow path 19, which is connected to the first flow path 15, is located further away from the imaginary plane S, which has the central axis X1 and the cutting edge 11, than the second outlet opening 27 of the fourth flow path 21, which is connected to the second flow path 17. This results in a high degree of freedom with respect to the direction of extension of the third flow path 19 and the fourth flow path 21, and with respect to the position of the first outlet opening 25 and the second outlet opening 27.

[0041] In the Fig. In the embodiment shown in Figure 3, the inner diameter of the fourth flow path 21 is smaller than the inner diameter of the second flow path 17. The discharge pressure of the coolant discharged from the second outlet opening 27 can be improved if the inner diameter of the fourth flow path 21 is smaller than the inner diameter of the second flow path 17.

[0042] In a Fig. 8 and Fig. In the embodiment shown in Figure 11, the second outlet opening 27 opens towards the cutting edge 11 to allow the coolant to flow towards the cutting edge 11. Specifically, an imaginary extension line L1 of the fourth flow path 21, which extends in a straight line, intersects the cutting edge 11. In cases where the imaginary extension line L1 of the fourth flow path 21 intersects the cutting edge 11, it is possible to cool the cutting edge 11 more efficiently.

[0043] The first outflow opening 25 opens towards a position on the imaginary plane S away from the cutting edge 11, in order to flow into a Fig. 7 and Fig. In the embodiment shown in Figure 8, the coolant is directed towards the chips produced by the cutting edge 11. Specifically, the first outlet opening 25 opens in the Fig. 7 and Fig. 8 illustrated embodiment in the direction above the cutting edge 11.

[0044] In cases where the first outlet opening 25 is arranged in this way, it is possible to apply the coolant expelled from the first outlet opening 25 stably to the chips produced by the cutting edge 11 and extending over the cutting edge 11. This results in improved chip evacuation.

[0045] Although in the Fig. 7 and Fig. In the embodiment shown in Figure 8, if the first outlet opening 25 is located further from the imaginary plane S than the second outlet opening 27, the third flow path 19 can be located further from the imaginary plane S than the fourth flow path 21. In cases where the third flow path 19 and the fourth flow path 21 have the positional relationship described above, it is possible to ensure a higher degree of freedom with respect to the direction of extension of the third flow path 19 and the fourth flow path 21, and with respect to the position of the first outlet opening 25 and the second outlet opening 27. This leads to more efficient cooling of the cutting edge 11 and improved chip removal.

[0046] The direction of extension of the third flow path 19 is not restricted to a specific direction. For example, the third flow path 19 can extend such that it moves away from the imaginary plane S as its distance from the first flow path 15 increases. The third flow path 19 extends upwards, so that it lies in the Fig. 8 of the illustrated embodiment with increasing distance from the first flow path 15 from the imaginary plane S.

[0047] The coolant passing through the third flow path 19 is expelled from the first outlet opening 25 in the direction of the chips produced by the cutting edge 11. In cases where the third flow path 19 extends such that it moves away from the imaginary plane S with increasing distance from the first flow path 15, the chips tend to be expelled by the coolant from the first outlet opening 25 in a direction away from the cutting edge 11, thus further improving chip evacuation performance.

[0048] The direction of extension of the fourth flow path 21 is not particularly restricted to a specific direction. For example, the fourth flow path 21 extends parallel to the imaginary plane S. The fourth flow path 21 can extend along the imaginary plane S, as in the fourth flow path 21 in the Fig. 8 illustrated embodiment.

[0049] The coolant passing through the fourth flow path 21 is expelled from the second outlet opening 27 towards the cutting edge 11. If the fourth flow path 21 is parallel to the imaginary plane S, the distance from the second outlet opening 27 to the cutting edge 11 is reduced. Consequently, the coolant expelled from the second outlet opening 27 can be applied more efficiently to the cutting edge 11. This results in more efficient cooling of the cutting edge 11.

[0050] Alternatively, the second outlet opening 27 can be arranged closer to one side of the first end 3a than the first outlet opening 25, as shown in the Fig. The embodiment shown in Figures 6 to 8. If the second outlet opening 27 is arranged relatively close to the side of the first end 3a, the length of the second outlet opening 27 can be reduced up to the cutting edge 11. Thus, the coolant expelled from the second outlet opening 27 can be efficiently applied to the cutting edge 11 as described above.

[0051] If the first outlet opening 25 is located relatively on one side of the second end 3b, the coolant expelled from the first outlet opening 25 is distributed over a large area. This enables a stable ejection of the chips produced by the cutting edge 11.

[0052] An angle formed by the fourth flow path 21 and the central axis X1 (hereinafter referred to as the second tilt angle Θ2) can be larger than an angle formed by the third flow path 19 and the central axis X1 (hereinafter referred to as the first tilt angle Θ1), as in a Fig. 11 illustrated embodiment.

[0053] If the second inclination angle Θ2 is relatively large, the length from the second outlet opening 27 to the cutting edge 11 can be further reduced, while the expulsion of the coolant from the second outlet opening 27 to the cutting edge 11 is facilitated. If the first inclination angle Θ1 is relatively small, it is possible to reduce the fluid pressure loss when the coolant flows from the first flow path 15 to the third flow path 19. Consequently, the chips tend to be ejected more stably by the coolant expelled from the second outlet opening 27.

[0054] The cutting tool 1a for internal diameter machining is not limited to a cutting tool for the internal grooving method. Examples of cutting tools for internal diameter machining are drill inserts. A drill insert for internal diameter machining is shown and described below as cutting tool 1b in one of its embodiments.

[0055] The cutting tool 1b in the embodiment is described below with reference to the Fig. Described in sections 12 to 17. Fig. Numbers 12 to 17 are drawings, each representing the Fig. 6 to 11 correspond. The following description of cutting tool 1b focuses mainly on the differences from cutting tool 1a. Therefore, in some cases, a detailed description of a configuration similar to that of cutting tool 1a is omitted.

[0056] Similar to cutting tool 1a, cutting tool 1b, which is located in the Fig. 12 and Fig. Figure 15 shows a main body 3 with a rod shape, extending along a central axis X1 from a first end 3a to a second end 3b. Similar to the one in Fig. The main body 3 shown in 6 is the main body 3 in a Fig. The embodiment shown in 12 consists of a holder 5, an insert 7 and a fastening element 9.

[0057] A pocket is arranged on one side of the first end 3a in the holder 5. The holder 5 directs the pocket in the Fig. 12 and Fig. The embodiment shown in Figure 13 is shown. A concave part is arranged on one side of the first end 3a in the holder 5, and the pocket is formed from the concave part in the Fig. 12 and Fig. The embodiment shown in Figure 13 is formed. The pocket is an area in which the insert 7 is arranged.

[0058] Insert 7 has the disc shape in the Fig. 2. The insert 7 has the form of a polygonal plate in the form shown in Fig. 13 embodiment shown. Similar to the use 7 in the in Fig. In the embodiment shown in 13, the insert 7 in the Fig. In the embodiment shown in Figure 2, the through-hole 7b is located. The through-hole 7b and the screw hole extend in the area shown in Figure 2. Fig. 2. In the embodiment shown, the through hole 7b and a screw hole extend in the direction of the central axis X1. The through hole 7b and a screw hole extend in an embodiment which is shown in Fig. 15 is shown, in a direction orthogonal to the central axis X1 in use 7.

[0059] Similar to the cutting tool 1a in the Fig. In the embodiment shown in 7, the cutting tool 1b has in the Fig. In the embodiment shown in Figure 13, the flow path 13 comprises a first flow path 15, a second flow path 17, a third flow path 19, and a fourth flow path 21. As in Fig. 13 and Fig. As shown in Figure 14, a first outlet opening 25 in the third flow path 19 is further away from an imaginary plane S, which has the central axis X1 and the cutting edge 11, than a second outlet opening 27 in the fourth flow path 21. Therefore, it is also in the cutting tool 1b in the Fig. In the embodiment shown in Figures 15 to 17, it is possible to efficiently cool the cutting edge 11 and to remove the chips in a suitable manner.

[0060] Although a detailed description is omitted, the described configuration of cutting tool 1a is suitably applicable to cutting tool 1b. For example, the third flow path 19 can extend such that it moves away from the imaginary plane S with increasing distance from the first flow path 15, and the fourth flow path 21 can extend parallel to the imaginary plane S in cutting tool 1b, as shown in Fig. 14 shown. <Verfahren zur Herstellung eines maschinell bzw. spanabhebend bearbeiteten Produkts>

[0061] The methods for producing a machined product 103 in various embodiments of the present disclosure are described in detail below. The cutting tool 1a is placed in a manner described in the Fig. The embodiment shown in Figures 18 to 20 is used, but it is not intended to be limited to this embodiment. For example, the cutting tool 1b can be used.

[0062] The method for producing a machined product 103 in one of the embodiments comprises the following steps (1) to (4). (1) Preparing a workpiece 101 and the cutting tool 1a as in Fig. 18 shown, (2) Turning the workpiece 101, (3) bring the workpiece 101 and the cutting tool 1a into contact with each other, as shown in Fig. 19 shown, and (4) separate the workpiece 101 and the cutting tool 1a from each other, as shown in Fig. 20 shown.

[0063] Specifically, examples of materials for the workpiece prepared in step (1) include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals. In step (1), the cutting tool 1a is placed in the Fig. 18 illustrated embodiment prepared.

[0064] In step (2), the workpiece 101 is rotated based on a rotary axis O of it, as shown in Fig. 18 shown.

[0065] In step (3), the cutting tool 1a is brought relatively close to the rotating workpiece 101 by moving the cutting tool 1a in the direction of arrow Y1. The cutting tool 1a is then brought into contact with the workpiece 101, which is positioned as shown in Fig. The workpiece 101 is rotated as shown in Figure 19. The workpiece 101 is cut by bringing the cutting edge of the cutting tool 1a into contact with the workpiece 101 in the position shown in Figure 19. Fig. In the embodiment shown in 19, the workpiece 101 is brought into contact with the workpiece. The workpiece 101 can be cut while the coolant is forced to flow out of the first and second outlet openings.

[0066] In step (4) the cutting tool 1a is held far away from the workpiece 101 in order to obtain the machined product 103 by moving the cutting tool 1a in an arrow direction Y2, as shown in Fig. 20 shown.

[0067] In the method for producing the machined product 103 in the embodiment, the use of the cutting tool 1a enables efficient cooling of the cutting edge and suitable chip emission.

[0068] Alternatively, in step (3), the workpiece 101 can be brought close to the cutting tool 1a. In step (4), the workpiece 101 can be held away from the cutting tool 1a. If a cutting operation is to be continued, the step in which the cutting edge is brought into contact with different parts of the workpiece 101 can be repeated while the workpiece 101 continues to be rotated.

[0069] While the cutting tools 1 and the methods for producing a machined product in the embodiments of the present disclosure have been explained above by way of example, the present disclosure is not limited to the embodiments mentioned above. It is of course possible to make any embodiments, provided they do not deviate from the core of the present disclosure. Reference symbol list 1a, 1b Cutting tool 3 main bodies 3a first end 3b second end 5 holders 5a Part with small diameter holder 5b Part with large diameter of the holder 7 deployment 7a End surface of the insert 7b Through hole of the insert 9 Fastening element (screw) 11 Cutting edge 13 Flow path 15 first flow path 17 second flow path 19 third flow path 21 fourth flow path 23 Inlet opening 25 first outlet 27 second outlet 101 workpiece 103 machined product L1 Extension line of the fourth flow path S imaginary plane that has the central axis and the cutting edge O axis of rotation of the workpiece X1 Central axis of the main body Y1 Arrow direction of movement of the cutting tool Y2 Arrow direction of the movement of the cutting tool Θ1 first angle (incline angle of the first flow path) Θ2 second angle (incline angle of the fourth flow path)< / schneidwerkzeuge>

Claims

[1] A cutting tool (1a, 1b) comprising: a main body (3) with a rod shape extending along a central axis (X1) from a first end (3a) to a second end (3b), wherein the main body (3) a cutting edge (11) which is arranged to project laterally from the first end (3a), a first flow path (15) which is arranged along the central axis (X1) and has an inlet opening (23), a second flow path (17) whose inner diameter is smaller than that of the first flow path (15), wherein the second flow path (17) is arranged from the first flow path (17) to the first end (3a) along the central axis (X1), a third flow path (19) which is connected to the first flow path (15) and has a first outflow opening (25), and a fourth flow path (21) which is connected to the second flow path (17) and has a second outflow opening (27), and the first outlet opening (25) is further away from an imaginary plane (S) that has the central axis (X1) and the cutting edge (11) than the second outlet opening (27), wherein the first outflow opening (25) opens in the direction above the cutting edge (11), wherein the second outflow opening (27) opens towards the cutting edge (11) and where part of the second outlet opening (27) is contained in the imaginary plane (S). [2] The cutting tool (1a, 1b) according to claim 1, wherein the third flow path (19) is arranged further away from the imaginary plane (S) than the fourth flow path (21). [3] The cutting tool (1a, 1b) according to claim 1 or 2, wherein the third flow path (19) extends to move away from the imaginary plane (S) as the distance from the first flow path (15) increases. [4] The cutting tool (1a, 1b) according to any one of claims 1 to 3, wherein the fourth flow path (21) extends parallel to the imaginary plane (S). [5] The cutting tool (1a, 1b) according to any one of claims 1 to 4, wherein the second outlet opening (27) is arranged closer to one side of the first end (3a) than the first outlet opening (25). [6] The cutting tool (1a, 1b) according to claim 5, wherein an angle (Θ2) formed by the fourth flow path (21) and the central axis (X1) is larger than an angle (Θ1) formed by the third flow path (19) and the central axis (X1). [7] The cutting tool (1a, 1b) according to any one of claims 1 to 6, wherein the second outlet opening (27) is arranged in a front view from a direction orthogonal to the imaginary plane (S) further away from the central axis (X1) than the first outlet opening (25). [8] The cutting tool (1a, 1b) according to any one of claims 1 to 7, wherein an inner diameter of the fourth flow path (21) is smaller than an inner diameter of the second flow path (17). [9] A method for producing a machined product (103), comprising: Turning a workpiece (101), bring the cutting tool (1a, 1b) according to any one of claims 1 to 8 into contact with the rotating workpiece (101), and move the cutting tool (1a, 1b) away from the workpiece (101).

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