Cutting tool and tool body and core member thereof

Abstract

The present application particularly relates to a large-diameter drilling tool or the like, which easily sets a cooling liquid discharge port at a desired position even if a complicated flow path of the prior art is not formed. A core member (20) detachably attached to a tool body (10) of a cutting tool, and having a cooling liquid tank (28) and a cooling liquid flow path (29). The cooling liquid tank (28) is provided at a tip end portion of the core member (20), and the cooling liquid flow path (29) is communicated from the cooling liquid tank (28) to a front end portion of the core member (20). Further, the tool body (10) includes a core member attachment portion for housing the core member (20), a first cooling liquid delivery path (18A) for delivering cooling liquid from a tip end portion (10b) side to the core member attachment portion, and a second cooling liquid delivery path communicated from an inner peripheral surface (11p) of the core member attachment portion to a front end portion (10t) of the tool body (10).

Description

Technical Field

[0001] This invention relates to a cutting tool and its tool body and core component. Background Technology

[0002] Conventionally, as large-diameter drilling tools, there are known tools with the insert holder and the cutting head integrated (the insert holder is equipped with an insert as the center cutting edge), and tools with a cartridge-type cutting groove (the cutting groove is equipped with an insert as the center cutting edge). In addition, as such large-diameter drilling tools, there are also known tools with a coolant flow path provided inside (for example, see Patent Documents 1-3).

[0003] Existing technical documents Patent documents Patent Document 1: Specification of Chinese Patent No. 103909287 Patent Document 2: US Patent No. 9,498,829 Patent document 3: Description of German patent application publication No. 102017209442. Summary of the Invention

[0004] Technical issues However, in large-diameter drilling tools, since the outer diameter of the tool is larger than the diameter of the coolant flow path located near the center of the tool body shaft, if a coolant outlet is to be located at a desired position in the direction from the coolant flow path near the shaft center toward the cutting edge at the tool tip, a complex branching flow path must be formed, making the flow path more complex. For example, to branch the flow path, it is sometimes necessary to pass through a hole penetrating the outer circumference of the tool. In this case, sealing the penetrating hole may require components unnecessary for the tool's function, thus creating problems.

[0005] Therefore, the present invention relates in particular to large-diameter drilling tools, etc., and aims to provide a cutting tool and its tool body and core components, which can easily provide a coolant outlet at a desired location even without forming the complex flow path of the prior art.

[0006] Solution One embodiment of the present invention is as follows: A core component, detachably mounted to the tool body of a cutting tool, the core component having: A coolant reservoir, which is disposed at the end of the core component along the central axis of the core component; and A coolant flow path that connects the coolant tank to the front end of the core component.

[0007] Because this core component has a structure that allows coolant to be transported from the end to the front end through a coolant flow path, it is easy to set the coolant outlet at the desired location even without forming the complex flow path of the prior art.

[0008] Multiple coolant tanks may be provided in the aforementioned core component.

[0009] In the aforementioned core component, an inlet for the coolant flow path can be provided on the bottom surface of the coolant tank.

[0010] The aforementioned core component may be provided with multiple coolant flow paths.

[0011] In the aforementioned core component, two coolant flow paths, which are a pair, can be arranged symmetrically with the central axis as the center.

[0012] In the aforementioned core component, the coolant flow path can be configured such that it gradually moves away from the central axis as it moves from the end portion toward the front portion.

[0013] In the aforementioned core component, a spiral groove can be provided on its outer peripheral surface.

[0014] The core component described above can be cylindrical.

[0015] In the aforementioned core component, the blade holder for mounting the cutting blade can be located at the front end of the core component.

[0016] Another embodiment of the present invention is as follows: A tool body for a cutting tool, on which a cutting blade and a drill bit are detachably mounted, the tool body comprising: A core component mounting section for mounting a core component, including a cutting edge, along the central axis of the tool body; A first coolant delivery path, the first coolant delivery path being used to deliver coolant from the end portion side toward the core component mounting portion; and The second coolant delivery path connects from the inner circumferential surface of the core component mounting section to the coolant outlet at the front end of the tool body.

[0017] Multiple second coolant delivery paths can be provided in the main body of the aforementioned tool.

[0018] In the aforementioned tool body, two second coolant delivery paths, which are a pair, can be arranged symmetrically with the central axis as the center.

[0019] In the aforementioned tool body, the second coolant delivery path can be configured as a flow path that gradually moves away from the central axis as it moves from the end portion toward the front portion.

[0020] In the aforementioned tool body, a spiral groove can be provided on its outer peripheral surface.

[0021] In the aforementioned tool body, the coolant outlet can be positioned in front of the tool body in the direction of rotation relative to the spiral groove.

[0022] Another embodiment of the present invention is as follows: A cutting tool comprising the aforementioned core component and the aforementioned tool body. The second coolant delivery path is formed in such a way that, with the core component installed in the core component mounting part of the tool body in a predetermined orientation, the second coolant delivery path is connected to the coolant tank of the core component. Attached Figure Description

[0023] Figure 1 This is a perspective view of a cutting tool according to one embodiment of the present invention.

[0024] Figure 2 This is a perspective view of an example of a drill head (tool body) of a cutting tool.

[0025] Figure 3 This is a perspective view of an example of a core component that can be detached from the drill bit head.

[0026] Figure 4A It is an exploded 3D view of the drill bit head, core components, cutting blades, etc.

[0027] Figure 4B It is a 3D view of the cutting blade.

[0028] Figure 5 This is a diagram of the drill bit head, etc., viewed from the front end side.

[0029] Figure 6A It is along Figure 5 A cross-sectional view of the drill bit head, etc., along the VI-VI line.

[0030] Figure 6B yes Figure 6A A magnified view of a portion of the image.

[0031] Figure 7 This is a three-dimensional view of an example of a core component.

[0032] Figure 8 This is a diagram of the core component as viewed from the front end side.

[0033] Figure 9 This is a diagram of the core component viewed from the side.

[0034] Figure 10 It is along Figure 5 A cross-sectional view of the drill bit head and core components of the XX line.

[0035] Figure 11 It is along Figure 5 A cross-sectional view of the drill bit head and core components of the XI-XI line.

[0036] Figure 12 It has Figure 10 A perspective view of the drill bit head and core components shown in the cross-section.

[0037] Figure 13A This is a perspective view of the core component with the center cutting blade mounted on the blade holder, viewed from the front end side.

[0038] Figure 13B This is a three-dimensional view of the core component as seen from the end side. Detailed Implementation

[0039] Hereinafter, preferred embodiments of the cutting tool and its tool body and core component provided by the present invention will be described in detail with reference to the accompanying drawings (see attached figures). Figure 1 wait).

[0040] Hereinafter, a drilling tool 1, which is an example of a preferred embodiment of the present invention, will be described (see reference). Figure 1 (etc.). The drilling tool 1 of this embodiment is configured as a tool including a tool body 10, a core member 20 that can be detached from the tool body 10, and a fixing unit 30, etc. (see reference). Figure 4A wait).

[0041] [Tool Body] The tool body 10 is formed as a component for assembling and disassembling the cutting insert 50 and the drill bit. Therefore, when the cutting tool is a drilling tool 1 as in this embodiment, the tool body 10 functions as a so-called drill head. In this embodiment, the tool body 10 extends along the central axis 10x from the end portion 10b to the front portion 10t. On this body, a core component mounting portion 11, a through hole 12, an outer peripheral surface 13, a chip groove 14, an insert holder 15, an extension assembly / disassembly portion 16, a guide block mounting portion 17, and a coolant delivery path 18 are provided (see reference). Figure 4A wait).

[0042] A core component mounting portion 11 is provided on the front end portion 10t of the tool body 10 so that the core component 20 is inserted along the central axis 10x. This core component mounting portion 11 is formed as a circular hole having an inner circumferential surface 11p and a bottom surface 11b (see reference). Figure 6A The inner circumferential surface 11p conforms to the outer shape of the core component 20 (e.g., cylindrical) and is formed along the central axis 10x. The bottom surface 11b abuts against the end portion 20b of the core component 20. The core component 20, mounted on the core component mounting portion 11, is fixed to the tool body 10 by the fixing unit 30 (see reference). Figure 6A wait).

[0043] The through hole 12 is provided for the passage of the fixing unit 30, etc., and therefore can be adopted in various ways depending on the specific example of the fixing unit 30. For example, in this embodiment, a fixing screw is used as the fixing unit 30, and an internal thread for engaging with the fixing screw is machined on the inner circumference of the through hole 12 (see reference). Figure 4A (etc.). Furthermore, in this embodiment, the through hole 12 is configured as follows: the centerline 12c of the through hole 12 is inclined relative to the central axis 10x, and the through hole 12 is inclined such that it gradually approaches the front end portion 10t side as it moves radially outward toward the tool body 10, and extends from the outer peripheral surface 13 of the tool body 10 to the inner peripheral surface 11p of the core component mounting portion 11 (see...). Figure 6A (etc.). When the fixing unit 30 passes through the inclined through hole 12 and presses against the abutment surface 21 on the outer periphery of the core member 20, in addition to the radial force, a component force along the central axis 10x is also generated. Therefore, the fixing unit 30 generates not only a force that presses the core member 20 against the inner peripheral surface 11p, but also a force that presses the core member 20 against the bottom surface 11b of the core member mounting portion 11 along the central axis 10x. This allows the fixing unit 30 to push the core member 20 axially toward the end portion 10b and press it against the bottom surface 11b, thereby achieving a more secure fixation or retention (see...). Figure 6B As long as this structure is adopted, the angle α formed by the central axis 10x of the tool body 10 and the center line 12c of the through hole 12 is not particularly limited. However, from the perspective of performing the above-mentioned functions, the angle α formed by the central axis 10x and the center line 12c on the imaginary plane formed by the two is preferably 45° or more and less than 90°, more preferably 74° or more and less than 76°. It should be noted that the angle α formed by the central axis 10x of the tool body 10 and the center line 12c of the through hole 12 on the imaginary plane formed by the central axis 10x and the center line 12c can also be equal to the angle formed by the central axis 10x and the perpendicular line 21v of the abutment surface 21.

[0044] The outer peripheral surface 13 of the tool body 10 has: a large diameter portion 13t near the front end 10t, a small diameter portion 13b closer to the end portion 10b than the large diameter portion 13t, and a tapered portion 13m connecting these large diameter portions 13t and small diameter portions 13b (see reference). Figure 2 (etc.). An opening of through hole 12 is provided on the circumferential surface of the large diameter portion 13t (see Figure 6).

[0045] Chip removal groove 14 is a groove used to discharge chips generated during cutting along with coolant. In the tool body 10 of this embodiment, a pair of chip removal grooves 14 are provided on the outer peripheral surface 13. The pair of chip removal grooves 14 are axially symmetrical about the central axis 10x (see reference). Figure 5 wait).

[0046] The blade holder 15 is a seat for mounting the cutting blade 50 onto the tool body 10. The specific arrangement of the blade holder 15 and the cutting blade 50 mounted thereon is not particularly limited; multiple blade holders 15 may be provided radially outward from the core component mounting portion 11. As an example, in this embodiment, four blade holders 15, two on each side of the central axis 10x, are arranged in a radially linear configuration (see reference). Figure 5 (etc.). On each blade holder 15, a cutting blade 50 is mounted in a predetermined orientation (see reference). Figure 2 wait).

[0047] Extension assembly / disassembly section 16 is the part used to install extension 62 (see reference). Figure 1 , Figure 2 (etc.). Although not specifically illustrated, the adapter 60 can also be directly installed on the extension part 16 without using the extension part 62.

[0048] The guide block mounting part 17 is provided for mounting the guide block 70. The guide block 70 is a component that abuts against the inner wall surface of the hole through which the workpiece is cut by the cutting blade 50, thereby providing a guiding function. The guide block 70 is mounted in the guide block mounting part 17 and is fixed to the side (outer peripheral surface 13) of the tool body 10 by a locking screw 72 (see reference). Figure 2 wait).

[0049] The coolant delivery path 18 is a flow path provided for supplying coolant to the cutting edge (e.g., the cutting edge of the cutting insert 40 constituting the center edge) at the front end of the drilling tool 1. In the tool body 10 of this embodiment, a circular first coolant delivery path 18A is provided inside the tool body 10, extending straight from the end portion 10b along the central axis 10x to the front portion 10t (see Figure 6). Figure 11 The portion of the first coolant delivery path 18A located on the front end 10t side opens at the bottom surface 11b of the core component mounting portion 11 to deliver coolant to the coolant tank 28 of the core component 20.

[0050] The main body 10 of the tool is also provided with a second coolant delivery path 18B and a coolant outlet 19 (see reference). Figure 10The second coolant delivery path 18B is configured to connect from the inner peripheral surface 11p of the core component mounting portion 11 in the tool body 10 to the front end portion 10t of the tool body 10, and its specific configuration is not particularly limited. As an example, in the tool body 10 of this embodiment, a pair of two second coolant delivery paths 18B are symmetrically arranged about the central axis 10x (see reference). Figure 10 , Figure 12 Furthermore, these two second coolant delivery paths 18B, which are a pair, are configured to gradually move away from the central axis 10x as they extend from the end portion 10b of the tool body 10 toward the front end portion 10t, thus forming a so-called trumpet-shaped extension (see reference). Figure 10 , Figure 12 At this time, the centrifugal force generated when the tool body 10 rotates can also function as a force to deliver coolant to the front end 10t side.

[0051] The coolant outlet 19 is the outlet for discharging the coolant flowing in the coolant delivery path 18 (first coolant delivery path 18A, second coolant delivery path 18B). In the tool body 10 of this embodiment, in each of the two second coolant delivery paths 18B, the coolant outlet 19 is positioned closer to the front of the tool body 10 in the direction of rotation than the chip removal groove (spiral groove) 14 (see reference). Figure 4A , Figure 5 The coolant discharged from the coolant outlet 19 in this configuration facilitates the feeding of chips into the chip removal groove (spiral groove) 14 and their discharge.

[0052] [Core Components] Core component 20 is a rigid component (steel body) that is detachable from the core component mounting part 11 of the tool body 10 (see reference). Figures 3 to 9 As the core component 20, components such as a so-called solid drill with an integrally formed cutting edge at the front end can be used, or components with interchangeable tips or interchangeable heads can be used. As an example, in this embodiment, a core component 20 with an interchangeable head structure will be described. The core component 20 of this embodiment is generally cylindrical (including the case of a cylindrical shape) extending along the central axis 20x, and includes an abutment surface 21, a spiral groove 22, a cutting tool holder 23, a coolant groove 28, and a coolant flow path 29, etc.

[0053] The abutting surface 21 is formed to abut against a portion of the fixing unit 30. In this embodiment, a notch is formed by cutting off a portion of the outer peripheral surface 20p of the core member 20, and the abutting surface 21 is formed in this notch portion (see reference). Figure 7(etc.). By inserting the core component 20 into the core component mounting portion 11 along the central axis 10x of the tool body 10, and in this state, making a portion of the fixing unit 30 abut against the contact surface 21, the core component 20 can be fixed to the tool body 10 (see reference). Figure 3 (etc.). The abutment surface 21 is arranged in such a way that it is inclined relative to an imaginary plane (denoted by the symbol VP in FIG. 6) perpendicular to the central axis 20x of the core member 20, and faces outward and toward the front end portion 20t side of the core member 20 (see reference). Figure 9 (etc.). For the contact surface 21, the imaginary plane formed by the central axis 20x and the perpendicular line 21v of the contact surface 21 (refer to the plane in the image). Figure 6B On the surface that appears as a cross-section, the angle β formed by the central axis 20x of the core member 20 and the perpendicular line 21v of the abutment surface 21 is preferably 45° or more and less than 90° (refer to...). Figure 9 Furthermore, an example of a preferred range for this angle β is 74° to 76°.

[0054] In this embodiment, such an abutment surface 21 is provided at a position near the end portion 20b of the core member 20 (see reference). Figure 7 (etc.), but this is only one example. Conversely, it can also be positioned near the front end 20t, or it can be positioned near the center along the length direction of the central axis 20x. Furthermore, in this embodiment, the abutment surface 21 is composed of a flat surface (see...). Figure 9 (etc.), but for example, the abutment surface 21 may also be composed of at least a surface containing a curved surface. Although not specifically illustrated, for example, by configuring the abutment surface 21 as a concave surface and configuring a portion of the fixing unit 30 (the portion abutting against the abutment surface 21) as a convex surface that matches the concave surface, it is possible to achieve automatic alignment or core alignment when the fixing unit 30 is pressed against the abutment surface 21. It should be noted that, although not specifically illustrated, the opposite structure may also be adopted, that is, the abutment surface 21 may be configured as a convex surface and a portion of the fixing unit 30 (the portion abutting against the abutment surface 21) may be configured as a concave surface that matches the convex surface, or the abutment surface 21 may be configured as a convex surface and a portion of the fixing unit 30 (the portion abutting against the abutment surface 21) may be configured as a plane. In the latter case, the position where the fixing unit 30 abuts against the abutment surface 21 is less affected by manufacturing tolerances, thereby enabling the core member 20 to be precisely fixed in the designed position.

[0055] The spiral groove 22 is formed by a spiral groove disposed on the outer periphery of the core member 20. In the core member 20 of this embodiment, two spiral grooves 22 arranged in a pair are axially symmetrical about the central axis 20x on the outer peripheral surface 20p (see reference). Figure 8(etc.). Furthermore, when the core component 20 is inserted into the core component mounting portion 11, the spiral groove 22 is formed to smoothly connect with the chip discharge groove 14 of the tool body 10, or to form a surface for smooth connection (see reference). Figure 2 (etc.). Since there is no drop in the chip discharge groove 14 formed in this way, it does not obstruct the chips during chip discharge, thereby improving chip discharge performance.

[0056] The blade holder 23 is disposed at the front end 20t of the core member 20 so that the cutting blade (blade) 40 is mounted along the central axis 20x (see [reference]). Figure 4A (etc.). A threaded hole 23h is provided near the insert holder 23 for the fixing screw 23s to pass through, and the fixing screw 23s is used to fix the cutting insert 40. In this way, the cutting insert 40, which is mounted on the insert holder 23 along the central axis 20x, functions as the central cutting edge of the drilling tool 1. It should be noted that on the front end side of the cutting insert 40, which functions as the central cutting edge of the drilling tool 1, there is a rake face 41 facing forward in the tool rotation direction and a flank face 42. The flank face 42 faces axially toward the central axis 10x and moves away from the front end as it moves toward the rear end in the tool rotation direction. The intersection of the rake face 41 and the flank face 42 forms the cutting edge 43 (see Figure 4A , Figure 4B Furthermore, an example is shown here with a single insert holder 23 located at the center of the drilling tool 1, but other arrangements are also possible. For example, although not specifically illustrated, multiple insert holders 23 may be arranged around a central axis 20x, and a drill bit with a replaceable tip may be mounted on these insert holders 23.

[0057] A coolant reservoir 28 is provided at the end portion 20b of the core component 20. When the core component 20 is inserted into the core component mounting portion 11 of the tool body 10, the coolant reservoir 28 communicates with the coolant delivery path 18 of the tool body 10, thereby forming a flow path for coolant flow (see reference). Figure 6A (etc.). The shape or structure of the coolant tank 28 is not particularly limited; for example, it can be formed by a single tank or by multiple tanks. In this embodiment, the coolant tank 28 of the core component 20 is formed by two tanks: a first coolant tank 281 and a second coolant tank 282 that intersect in a cross shape (see reference). Figure 7 , Figure 13B (etc.). An inlet 29a for a coolant flow path 29 is provided on the bottom surface 281b of the first coolant tank 281. In the core component 20 of this embodiment, the two inlets 29a are symmetrically arranged about the central axis 20x (see reference). Figure 11 , Figure 13B ).

[0058] The coolant flow path 29 is, for example, multiple flow paths provided inside the core component 20, for guiding the coolant flowing into the coolant tank 28 to the front end 20t and discharging it. In this embodiment, the coolant flow path 29 of the core component 20 consists of two flow paths, which extend from a portion of the coolant tank 28 (e.g., the bottom surface 281b of the first coolant tank 281) to the coolant outlet 29e (see reference). Figure 7 , Figure 8 , Figure 12 (etc.). Two coolant outlets 29e, arranged as a pair, are configured to discharge coolant toward the cutting edge (e.g., the cutting edge of the cutting insert 40 constituting the center edge) at the front end of the drilling tool 1 (see reference). Figure 13A (etc.). In this embodiment, the two coolant flow paths 29 of the core component 20 are arranged symmetrically about the central axis 20x (see reference). Figure 11 (etc.). Furthermore, these coolant flow paths 29 are configured to gradually move away from the central axis 20x from the end portion 20b toward the front portion 20t, thus forming a so-called trumpet-shaped expansion (see...). Figure 11 ).

[0059] The core member 20 of this embodiment, having this structure, can transport coolant from the end portion 20b to the front portion 20t via the aforementioned coolant flow path 29. Therefore, even without forming the complex flow path of the prior art, it is easy to provide the coolant outlet 29e at the desired location.

[0060] [Fixed Unit] The fixing unit 30 is used to fix the core member 20, which is installed in the core member mounting part 11 of the tool body 10. As described above, although a fixing screw is used as the fixing unit 30 in this embodiment (see reference 10), the fixing unit 30 is fixed with a fixing screw. Figure 6A (etc.), but this is only one example of a suitable means for fixing the core member 20, and of course, other components besides screws can also be used. As components other than screws, force-applying components that utilize elastic deformation (spring components, or components that deform a part of the tool body 10, etc.) can also be used. In addition, the shape of the through hole 12 can be appropriately changed according to the shape of the fixing unit 30 (for example, changing it to a structure that accommodates the force-applying component in a non-through hole).

[0061] [Drilling tools] The drilling tool 1 of this embodiment is configured as a tool including the tool body 10 as described above, a core member 20 that can be detached from the tool body 10, and a fixing unit 30, etc. (see reference) Figure 4A (etc.). In the state where the core component 20 is inserted into the core component mounting portion 11 of the tool body 10 with a predetermined orientation and fixed by the fixing unit 30 (see reference...). Figure 6A(etc.), the second coolant delivery path 18B is connected to the second coolant tank 282 of the coolant tank 28 of the core component 20 (refer to) Figure 10 A portion of the coolant supplied from the first coolant supply path 18A flows into the second coolant supply path 18B through the coolant tank 28 of the core component 20 and is discharged from the coolant outlet 19.

[0062] Based on the aforementioned tool body 10, core component 20, fixing unit 30, or drilling tool 1 composed of these, the outer peripheral surface 20p of the core component 20 is pressed in a direction inclined relative to the imaginary plane VP (which is perpendicular to the central axis 20x of the core component 20) by the fixing unit 30, thereby generating a component force along the central axis 10x of the tool body 10 or along the central axis 20x of the core component 20, thereby more firmly fixing the core component 20. Regarding this point, in large-diameter drilling tools, although conventional tools with a box-shaped insert holder (containing the insert as the center cutting edge) have the advantage of only needing to replace the insert holder when the center cutting edge is damaged, compared to non-box-shaped tools, the cylindrical component serving as the center cutting edge is sometimes fixed in the following way: the component is inserted into an insertion hole located at the center of the axial front end of the drilling tool body, and the front end of a screw inserted into a threaded hole is used to press against a plane located on the side of the component and parallel to the central axis of the component. This threaded hole is positioned perpendicular to the central axis of the tool body and extends from the outer circumferential surface of the tool body toward the inner circumferential surface of the insertion hole. With this fixing method, it must be acknowledged that the force parallel to the central axis of the component can only be resisted by the frictional force generated between the inner circumferential surface of the insertion hole and the outer circumferential surface of the component, which is caused by the clamping force of the screw. In this regard, the drilling tool 1 described in this embodiment has the advantages described above.

[0063] Furthermore, the drilling tool 1 according to this embodiment adopts a so-called dual structure, namely, a structure in which a replaceable center cutting edge (cutting blade 40) is inserted into the core member 20 and the core member 20 is inserted into the tool body 10. This structure easily prevents damage or deformation of the tool body 10 itself. Moreover, since the core member 20 can be firmly fixed to the tool body 10, stable cutting performance is easily achieved even when machining under high-efficiency machining conditions or unstable conditions.

[0064] It should be noted that the above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto. Various modifications can be made without departing from the spirit of the present invention. For example, the drilling tool 1 described in the above embodiment is a so-called dual-structure tool with interchangeable cutting tips. Its tool body (drill head) 10 is detachably equipped with a core member 20 and its core member 20 is detachably equipped with a center cutting edge (cutting blade 40). However, this is only a preferred example, and it can certainly be applied to other structures, such as tools with blades made of cemented carbide or the like (e.g., a drill bit with a cutting edge with a blade made of cemented carbide or other materials welded on as the cutting edge, or the core member 20, etc.).

[0065] Furthermore, the above embodiments illustrate an example of applying the invention to a drilling tool 1, but this is merely one example of cutting tools to which the invention is applicable. Besides such drilling tools (drill bits), the invention can also be applied to milling tools such as end mills.

[0066] Furthermore, the above-described dual-structure cutting tool (drilling tool) has been used as an example, but the present invention can certainly also be applied to a triple-structure cutting tool. For example, the core member 20 is a so-called straight shank twist drill, with a drill bit integrally provided as a central cutting edge at its front end 20t, and a cutting insert disposed on its outer periphery (outside the central cutting edge). Thus, the core member 20 and the tool body 10 are combined to form a triple-structure cutting tool, which can also be applied to the present invention.

[0067] Industrial availability Preferably, the present invention is applicable to the tool body and core components of a cutting tool.

[0068] Explanation of main component symbols 1. Drilling tool (cutting tool); 10. Tool body; 10b. End portion; 10t. Front end portion; 10x. Central axis; 11. Core component mounting portion; 11b. Bottom surface; 11p. Inner peripheral surface; 12. Through hole; 12c. (Through hole) centerline; 13. Outer peripheral surface; 13b. Small diameter portion; 13t. Large diameter portion; 13m. Tapered portion; 14. Chip removal groove (spiral groove); 15. Tool holder; 16. Extension assembly / disassembly portion; 17. Guide block mounting portion; 18. Coolant delivery path; 18A. First coolant delivery path; 18B. Second coolant delivery path; 19. Coolant outlet; 20. Core component; 20b. End portion; 20p. Outer peripheral surface; 20t. Front end portion; 20x. Central axis; 21. Abutment surface; 21v. Perpendicular line of the abutment surface; 22. Spiral groove ; 23, blade holder; 23h, threaded hole; 23s, fixing screw; 28, (end part) coolant tank; 281, first coolant tank; 281b, (first coolant tank) bottom surface; 282, second coolant tank; 29, coolant flow path; 29a, coolant flow path inlet; 29e, coolant outlet; 30, fixing unit; 40, center cutting edge (cutting blade); 41, rake face; 42, flank face; 43, cutting edge; 50, cutting blade; 60, adapter; 62, extension; 70, guide block; 72, stop screw; α, angle between the central axis 10x of the tool body 10 and the center line 12c of the through hole 12; β, angle between the central axis 20x of the core component 20 and the perpendicular line 21v of the contact surface 21; VP, imaginary plane (perpendicular to the central axis).

Claims

1. A core component detachably mounted to the tool body of a cutting tool, said core component having: A coolant tank, the coolant tank being disposed at the end of the core component along the central axis of the core component; and A coolant flow path, which connects from the coolant tank to the front end of the core component.

2. The core component according to claim 1, characterized in that, The core component is provided with multiple coolant tanks.

3. The core component according to claim 1, characterized in that, The inlet of the coolant flow path is provided on the bottom surface of the coolant tank.

4. The core component according to claim 1, characterized in that, The core component is provided with multiple coolant flow paths.

5. The core component according to claim 4, characterized in that, The two coolant flow paths, which are a pair, are arranged symmetrically around the central axis.

6. The core component according to claim 4, characterized in that, The coolant flow path is configured such that it gradually moves away from the central axis as it moves from the end portion toward the front portion.

7. The core component according to any one of claims 1 to 6, characterized in that, A spiral groove is provided on the outer peripheral surface of the core component.

8. The core component according to any one of claims 1 to 6, characterized in that, The core component is cylindrical.

9. The core component according to any one of claims 1 to 6, characterized in that, A blade holder for mounting cutting blades is located at the front end of the core component.

10. A tool body for a cutting tool, wherein a cutting blade and a drill bit are detachably mounted on the tool body, the tool body comprising: A core component mounting section is used to mount a core component, including a cutting edge, along the central axis of the tool body; A first coolant delivery path is used to deliver coolant from the end portion side toward the core component mounting portion; as well as The second coolant delivery path connects from the inner circumferential surface of the core component mounting portion to the coolant outlet at the front end of the tool body.

11. The tool body according to claim 10, characterized in that, The tool body is provided with multiple second coolant delivery paths.

12. The tool body according to claim 11, characterized in that, The two second coolant delivery paths, which are a pair, are arranged symmetrically around the central axis.

13. The tool body according to claim 11, characterized in that, The second coolant delivery path is configured as a flow path that gradually moves away from the central axis as it moves from the end portion toward the front portion.

14. The tool body according to any one of claims 10 to 13, characterized in that, A spiral groove is provided on the outer peripheral surface of the tool body.

15. The tool body according to claim 14, characterized in that, The coolant outlet is positioned in front of the spiral groove in the direction of rotation of the tool body.

16. A cutting tool, comprising a core member according to any one of claims 1 to 6 and a tool body according to any one of claims 10 to 13, characterized in that, The second coolant delivery path is formed such that, with the core component installed in the core component mounting portion of the tool body in a predetermined orientation, the second coolant delivery path is connected to the coolant tank of the core component.

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