Cutting tip holder and cutting tool

Abstract

To provide a cutting tip holder that can efficiently cool cutting tips with a coolant, and a cutting tool.SOLUTION: A cutting tip holder includes a head block, and first and second coolant nozzles. The head block includes: first to third block faces; and an attachment structure to which a cutting tip is attached in an attitude in which the first block face is visible when viewed from a normal direction of the first tip face, the second block face is visible when viewed from a normal direction of the second tip face, and the third block face is visible when viewed from a normal direction of the third tip face. The first coolant nozzle is attached to the first block face. The second coolant nozzle is attached to at least one of the second and third block faces. A discharge port of the first coolant nozzle is disposed facing the first tip face, and a discharge port of the second coolant nozzle is disposed facing the second or third tip face.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to cutting tip holders and cutting tools. [Background technology]

[0002] There is known a cutting tool that includes a cutting tip and a cutting tip holder that holds the cutting tip, and cuts an object to be cut with the cutting tip. The cutting tip is held by the cutting tip holder with a rake face and a flank face exposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-47304 A Summary of the Invention [Problem to be solved by the invention]

[0004] In cutting tools, the temperature of the cutting tip increases as the cutting of the workpiece is performed, which may affect the service life of the cutting tip. For this reason, measures are taken to cool the cutting tip with a coolant, as disclosed in Patent Document 1, for example. However, the cutting tip is difficult to cool because the workpiece and chips make it difficult for the coolant to reach the cutting tip.

[0005] Therefore, one aspect of the present disclosure aims to provide a cutting tip holder and a cutting tool that can efficiently cool a cutting tip with a coolant. [Means for solving the problem]

[0006] A cutting tip holder according to one embodiment of the present disclosure is a cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, each surface being disposed adjacent to the other two surfaces, the cutting tip holder comprising: a head block to which the cutting tip is attached; a first coolant nozzle including at least one outlet; and at least one second coolant nozzle including at least one outlet, the head block comprising a first block surface, a second block surface, and a third block surface, each surface being disposed adjacent to the other two surfaces, the first block surface being visible when viewed from a normal direction of the first tip surface, and the second block surface being visible when viewed from a normal direction of the second tip surface. and a mounting structure in which the cutting tip is mounted in a position in which the third block face is visible when viewed from a direction normal to the third tip face, wherein the first coolant nozzle is mounted to the first block face of the head block, the second coolant nozzle is mounted to at least one of the second block face or the third block face of the head block, the at least one outlet of the first coolant nozzle is arranged toward the first tip face of the cutting tip, and the at least one outlet of the second coolant nozzle is arranged toward the second tip face or the third tip face of the cutting tip. Effect of the Invention

[0007] According to one aspect of the present disclosure, it is possible to provide a cutting tip holder and a cutting tool capable of efficiently cooling a cutting tip with a coolant. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an external view of a cutting tool according to an embodiment. [Diagram 2] FIG. 2 is a partial view showing a cutting tip attached to the cutting tool of FIG. 1 and a configuration around the cutting tip. [Diagram 3] FIG. 3 is a partial cross-sectional view showing a cutting tip attached to the cutting tool of FIG. 1 and a configuration around the cutting tip. [Figure 4]FIG. 4 is a partial view of the cutting tool of FIG. 1 seen from the first tip face side during a cutting operation. [Diagram 5] FIG. 5 is a partial view of the cutting tool of FIG. 1 seen from the second tip face side during a cutting operation. [Figure 6] FIG. 6 is a partial view showing a cutting tip attached to a cutting tool according to a first modified example and a configuration around the cutting tip. [Figure 7] FIG. 7 is a partial view of a cutting tool according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Embodiment) Hereinafter, the embodiment will be described with reference to the drawings. The normal direction of the first tip surface, the normal direction of the second tip surface, and the normal direction of the third tip surface mentioned below refer to the directions when the cutting tip 2 is attached to the cutting tip holder 3.

[0010] FIG. 1 is an external view of a cutting tool 1 according to an embodiment. As shown in FIG. 1, the cutting tool 1 includes a cutting tip 2 and a cutting tip holder 3 that holds the cutting tip 2. The cutting tool 1 holds the cutting tip 2 in a detachable manner. The cutting tool 1 is attached to a cutting device that performs lathe machining of the workpiece W by, for example, bringing the cutting tool 1 into contact with the workpiece W while rotating the workpiece W. Heat generated by the cutting tip 2 during cutting work is cooled by a coolant supplied to the cutting tip 2. As will be described in detail later, in the cutting tool 1, the cooling effect of the cutting tip 2 is improved by supplying the coolant toward each tip surface C1 to C3 of the cutting tip 2.

[0011] The cutting tip 2 includes a hard material such as cemented carbide. The cutting tip 2 has a first tip face C1, a second tip face C2, and a third tip face C3, each of which is disposed adjacent to the other two faces. The first tip face C1 is also referred to as a rake face. The second tip face C2 and the third tip face C3 are also referred to as flank faces. The cutting tip 2 of this embodiment has a rectangular parallelepiped shape in which the first tip face C1, the second tip face C2, and the third tip face C3 are quadrangular when viewed from each normal direction.

[0012] The cutting tip 2 also has a processing point C4 located at the boundary between the first tip surface C1, the second tip surface C2, and the third tip surface C3. The processing point C4 is also called a corner or a cutting edge. The processing point C4 comes into contact with the workpiece W. The cutting tip 2 also has a through hole 2a extending in the normal direction Z of the first tip surface C1. A fixing member 31 of the cutting tip holder 3, which will be described later, is inserted into the through hole 2a.

[0013] The machining point C4 does not have to be an exact point. Also, when viewed from the normal direction Z of the first tip face C1, a minute region of the cutting tip 2 including the machining point C4 may have a curve (nose radius).

[0014] The shape of the cutting tip 2 is not limited to a rectangular parallelepiped shape, and may be, for example, a cylindrical shape. In the cylindrical cutting tip 2, when the processing point C4 is in contact with the workpiece W, the region located on one side of the processing point C4 functions as the second chip surface C2, and the region located on the other side of the processing point C4 functions as the third chip surface C3, as viewed from the normal direction Z of the first chip surface C1. That is, the peripheral surface of the cylindrical cutting tip 2 includes the second chip surface C2 and the third chip surface C3.

[0015] The cutting tip holder 3 has a head block 3a and a mounting block 3b. The cutting tip 2 is attached to the head block 3a. The head block 3a has a first block face B1, a second block face B2, and a third block face B3, each of which is disposed adjacent to the other two faces. In the present embodiment, as an example, the first block face B1 and the first tip face C1 are parallel faces. Also, the second block face B2 and the second tip face C2 are parallel faces. Also, the third block face B3 and the third tip face C3 are parallel faces. The configuration of the head block 3a is not limited thereto. For example, at least one of the block faces B1 to B3 may be curved or spherical, or may include multiple faces.

[0016] The head block 3a has a mounting structure 3c to which the cutting tip 2 is attached. The cutting tip 2 is attached to the mounting structure 3c in a position where the first block face B1 is visible when viewed from the normal direction Z of the first tip face C1, the second block face B2 is visible when viewed from the normal direction X of the second tip face C2, and the third block face B3 is visible when viewed from the normal direction Y of the third tip face C3. The position where the block face is visible when viewed from the normal direction of the tip face means a position where an average worker can view the block face when viewed from the normal direction of the tip face when attaching the cutting tip 2, and may be a position where cutting work can be performed with the cutting tip.

[0017] The head block 3a has a tip seat 3d that faces the surface of the cutting tip 2 opposite to the first tip surface C1 via a sheet member 30 described later. The tip seat 3d is disposed at the tip portion of the head block 3a where the second block surface B2 and the third block surface B3 are adjacent to each other when viewed from the normal direction Z of the first tip surface C1. The tip seat 3d is provided with an insertion hole 3e into which the tip portion of the fixing member 31 is inserted. In this embodiment, the tip seat 3d and the first tip surface C1 are parallel surfaces. However, the tip seat 3d and the first tip surface C1 are not limited to this and do not have to be parallel surfaces.

[0018] The mounting structure 3c of this embodiment includes, as an example, a sheet member 30, a fixing member 31, and a locking member 32. The sheet member 30 is a plate-like body and is disposed on the tip seating surface 3d. The sheet member 30 has a through hole 30a (see FIG. 2) through which the fixing member 31 is inserted in the plate thickness direction. The plate surface of the sheet member 30 of this embodiment and the first tip surface C1 are parallel planes.

[0019] Fig. 2 is a partial view showing the cutting tip 2 attached to the cutting tool 1 in Fig. 1 and the configuration around the cutting tip 2. Fig. 3 is a partial cross-sectional view showing the cutting tip 2 attached to the cutting tool 1 in Fig. 1 and the configuration around the cutting tip 2.

[0020] As shown in FIG. 2, the fixing member 31 has a shaft portion 31a and an expanded diameter portion 31b arranged at one end of the shaft portion 31a. The expanded diameter portion 31b engages with the periphery of the through hole 2a of the cutting tip 2. As shown in FIG. 3, the shaft portion 31a has a recessed portion 31c arranged at a part of the shaft portion 31a and recessed toward the radially inward direction of the shaft portion 31a. The locking member 32 is a member having a shaft portion. The locking member 32 has an engagement groove 32a arranged at one end face in the axial direction and engaged with a fastening tool, and a first screw 32b arranged on the circumferential surface.

[0021] The head block 3a has a first guide path R1 into which the shaft portion 31a of the fixing member 31 is inserted and guided, and a second guide path R2 into which the locking member 32 is inserted and guided. The guide paths R1 and R2 extend in intersecting directions and communicate with each other. The mounting structure 3c has a second screw 3f that is disposed on the inner peripheral surface of the head block 3a that defines the second guide path R2 and that screws into the first screw 32b.

[0022] With the seat member 30 placed on the tip seat 3d and the cutting tip 2 placed on the surface of the seat member 30 opposite to the tip seat 3d, the shaft portion 31a is inserted into the through holes 2a, 30a and the first guide path R1. With a fastening tool engaged in the engagement groove 32a, the first screw 32b is screwed into the second screw 3f. As the screws 3f and 32b are screwed together, the tip portion of the locking member 32 on the insertion side presses the surface in the recess 31c in the direction in which the second guide path R2 extends. As a result, the fixing member 31 is drawn into the inside of the first guide path R1. At this time, the cutting tip 2 is pressed against the tip seat 3d via the seat member 30 by the enlarged diameter portion 31b of the fixing member 31.

[0023] The cutting tip 2 is pressed against a wall surface 3g of the head block 3a disposed between the tip seating surface 3d and the first block surface B1. The cutting tip 2 is positioned relative to the head block 3a by the surface of the sheet member 30 opposite to the tip seating surface 3d and the wall surface 3g of the head block 3a. In this manner, the cutting tip 2 is attached to the cutting tip holder 3 by the attachment structure 3c. Note that the configuration of the attachment structure 3c is not limited to this.

[0024] The cutting tip holder 3 includes a plurality of coolant nozzles. The plurality of coolant nozzles spray coolant for cooling the heat generated in the cutting tip 2. The coolant can be appropriately selected from, for example, a liquid, a gas, and a mixture thereof. The coolant in this embodiment contains water.

[0025] The cutting tip holder 3 includes a first coolant nozzle 33 including at least one outlet. As shown in Fig. 1, the first coolant nozzle 33 is attached to a first block surface B1 of the head block 3a. The at least one outlet of the first coolant nozzle 33 is arranged toward a first tip surface C1 of the cutting tip 2.

[0026] The cutting tip holder 3 includes at least one second coolant nozzle including at least one outlet. The at least one second coolant nozzle is attached to at least one of the second block face B2 or the third block face B3 of the head block 3a. The at least one outlet of the second coolant nozzle is arranged toward the second tip face C2 or the third tip face C3 of the cutting tip 2.

[0027] The at least one second coolant nozzle in this embodiment may include a pair of second coolant nozzles 34, 35 attached to the second block face B2 and the third block face B3 of the head block 3a, respectively. In this case, for example, the second coolant nozzle 34 is attached to the second block face B2. Also, the second coolant nozzle 35 is attached to the third block face B3.

[0028] In the cutting tip holder 3 of this embodiment, of the outlet of the first coolant nozzle 33 and the outlet of the second coolant nozzles 34 and 35, at least the outlet of the second coolant nozzles 34 and 35 are directed toward the processing point C4. As an example in this embodiment, all of the outlet of the first coolant nozzle 33 and the outlet of the second coolant nozzles 34 and 35 are directed toward the processing point C4 of the cutting tip 2.

[0029] The at least one outlet of the first coolant nozzle 33 includes, for example, a plurality of outlets 33a to 33c. As shown in FIG. 2, the plurality of outlets 33a to 33c are arranged at a plurality of different positions when viewed from the normal direction Z of the first tip surface C1. As a result, abundant coolant is discharged from the plurality of outlets 33a to 33c from different directions toward the machining point C4. The first coolant nozzle 33 of this embodiment is arranged at a position protruding outward from the first block surface B1. As a result, the coolant jetted from the outlets 33a to 33c toward the first tip surface C1 easily reaches the machining point C4 of the cutting tip 2.

[0030] The pair of second coolant nozzles 34, 35 have one outlet 34a, 35a, as an example. The outlets 34a, 35a of the pair of second coolant nozzles 34, 35 eject coolant toward the processing point C4 from different directions. The second coolant nozzle 34 of this embodiment is disposed at a position protruding outward from the second block face B2. This makes it easier for the coolant ejected from the outlet 34a toward the second tip face C2 to reach the processing point C4 of the cutting tip 2. The second coolant nozzle 35 of this embodiment is disposed at a position protruding outward from the third block face B3. This makes it easier for the coolant ejected from the outlet 35a toward the third tip face C3 to reach the processing point C4 of the cutting tip 2.

[0031] In this embodiment, the outlets 33a to 33c have the same inner diameter, for example. In addition, the outlets 34a and 35a have the same inner diameter, for example. In this embodiment, the inner diameters of the outlets 34a and 35a are larger than the inner diameters of the outlets 33a to 33c. Note that the inner diameters of the outlets 34a and 35a may be smaller than the inner diameters of the outlets 33a to 33c, or may be the same as the inner diameters of the outlets 33a to 33c.

[0032] In the cutting tip holder 3 of this embodiment, for example, the shortest distance between the second coolant nozzles 34, 35 and the processing point C4 is longer than the shortest distance between the first coolant nozzle 33 and the processing point C4. This prevents the second coolant nozzles 34, 35 from interfering with the workpiece W and chips when the processing point C4 is in contact with the workpiece W. Therefore, the coolant from the second coolant nozzles 34, 35 can be stably supplied to the second tip surface C2 and the third tip surface C3. For example, when the first tip surface C1 is a horizontal plane, the outlets 34a, 35a are disposed below the first tip surface C1 (see FIG. 5).

[0033] As shown in FIG. 2, the head block 3a of this embodiment may have a shape such that, when viewed from one direction (here, the normal direction Z of the first tip surface C1), the first block surface B1 is visible, but the second block surface B2 and the third block surface B3 are not visible.

[0034] When viewed from the one direction, the head block 3a may have the pair of second coolant nozzles 34, 35 entirely disposed inside an area A described below. The pair of second coolant nozzles 34, 35 are disposed symmetrically inside the area A with respect to an axis of symmetry S between the second block face B2 and the third block face B3.

[0035] The head block 3a of this embodiment may have a shape such that, when viewed from the one direction, the first block face B1 is visible, but the second block face B2 and the third block face B3 are not visible, and each of the pair of second coolant nozzles 34, 35 may be entirely disposed inside the region A.

[0036] Region A is a region including the first block face B1 between the straight lines L1 and L2 when viewed from the one direction. The straight lines L1 and L2 are a pair of perpendicular straight lines when viewed from the one direction (i.e., the angle between the straight lines L1 and L2 is 90°), passing through the machining point C4 of the cutting tip 2 as an intersection point, and are symmetrically disposed with respect to the symmetry axis S of the second block face B2 and the third block face B3.

[0037] According to the above configuration, it is possible to suppress interference of the second block face B2, the third block face B3 and the second coolant nozzles 34, 35 with the workpiece W and chips. Therefore, the coolant from the second coolant nozzles 34, 35 can be stably supplied toward the second tip face C2 and the third tip face C3. The arrangement of the pair of second coolant nozzles 34, 35 is not limited to this. For example, the pair of second coolant nozzles 34, 35 may be at least partially arranged outside the region A when viewed from the one direction. Also, the pair of second coolant nozzles 34, 35 may be asymmetrically arranged inside the region A with respect to the axis of symmetry S when viewed from the one direction.

[0038] As an example, when viewed from the one direction, each of the pair of second coolant nozzles 34, 35 is entirely disposed between a plane P1 including the second tip surface C2 and a plane P2 including the third tip surface C3, which are disposed symmetrically with respect to the axis of symmetry S within region A. When viewed from the one direction, the pair of second coolant nozzles 34, 35 are disposed symmetrically between the planes P1 and P2 with respect to the axis of symmetry S. As an example, the angle between the planes P1 and P2 is a value in the range of less than 90°.

[0039] According to the above configuration, the amount by which the second coolant nozzles 34, 35 protrude outward from the block faces B2, B3 is suppressed, so that the pair of second coolant nozzles 34, 35 are prevented from interfering with the workpiece W and chips. Therefore, the coolant from the second coolant nozzles 34, 35 can be stably supplied toward the second tip face C2 and the third tip face C3. The arrangement of the pair of second coolant nozzles 34, 35 is not limited to this. For example, when viewed from the one direction, at least a part of the pair of second coolant nozzles 34, 35 may be arranged outside between the planes P1, P2. Also, when viewed from the one direction, the pair of second coolant nozzles 34, 35 may be arranged asymmetrically between the planes P1 and P2 with respect to the symmetry axis S. Also, the angle between the planes P1 and P2 may be a value in the range of 90° or more.

[0040] In the cutting tip holder 3 of this embodiment, at least one of the first coolant nozzle 33 and the second coolant nozzles 34, 35 (both in this embodiment) is detachably attached to the head block 3a. The first coolant nozzle 33 of this embodiment is attached to the first block face B1 of the head block 3a by a fastening structure. The second coolant nozzles 34, 35 of this embodiment are attached to the second block face B2 and the third block face B3 by a fastening structure. This allows each of the coolant nozzles 33-35 to be individually and easily attached to and detached from the head block 3a.

[0041] The cutting tip holder 3 of this embodiment includes a coolant flow path R3 through which the coolant flows. The coolant flow path R3 includes, for example, a first flow path R31, a second flow path R32, and at least one third flow path R33, R34. The first flow path R31 allows coolant supplied from the outside to flow. In the cutting tip holder 3 of this embodiment, coolant is supplied from the cutting device to the first flow path R31 in a state in which the mounting block 3b is attached to the cutting device.

[0042] The second flow passage R32 branches off from the first flow passage R31 and extends toward the first coolant nozzle 33. The at least one third flow passage in this embodiment includes, for example, a pair of third flow passages R33 and R34. The third flow passage R33 branches off from the first flow passage R31 and extends toward the second coolant nozzle 35. The third flow passage R34 branches off from the first flow passage R31 and extends toward the second coolant nozzle 34. The coolant flow passage R3 in this embodiment is, for example, disposed inside the head block 3a. This allows the cutting tip holder 3 to be made compact. Note that all or a part of the coolant flow passage R3 may be provided outside the head block 3a.

[0043] In the head block 3a of the present embodiment, for example, the angle between the first block face B1 and the second block face B2 and the angle between the first block face B1 and the third block face B3 are values ​​in the range of less than 90°. The angles are, for example, values ​​in the range of 45° to 80°.

[0044] According to the above configuration, the amount by which the second coolant nozzle 34 protrudes outward from the boundary position between the first block face B1 and the second block face B2 when viewed from the normal direction Z of the first chip face C1 can be suppressed. Also, the amount by which the second coolant nozzle 35 protrudes outward from the boundary position between the first block face B1 and the third block face B3 when viewed from the normal direction Z of the first chip face C1 can be suppressed. This further suppresses the pair of second coolant nozzles 34, 35 from interfering with the workpiece W and chips, etc. Therefore, the coolant from the pair of second coolant nozzles 34, 35 can be stably supplied toward the second chip face C2 and the third chip face C3.

[0045] The arrangement of the block faces B1 to B3 is not limited to this. For example, the head block 3a may have an angle between the first block face B1 and the second block face B2, or an angle between the first block face B1 and the third block face B3, which is a value in the range of 90° or more. In this case, the angle between the first block face B1 and the second block face B2, or the angle between the first block face B1 and the third block face B3, may be, for example, a value in the range of 90° or more and 120° or less.

[0046] Fig. 4 is a partial view of the cutting tool 1 of Fig. 1 seen from the first tip surface C1 side during cutting operation. Fig. 4 shows, as an example, how the cutting tool 1 turns the cylindrical workpiece W by external diameter machining while the workpiece W rotates. Fig. 5 is a partial view of the cutting tool 1 of Fig. 1 seen from the second tip surface C2 side during cutting operation. When the cutting tool 1 is used, the mounting block 3b of the cutting tool 1 is attached to a cutting device.

[0047] As shown in FIG. 4, for example, the workpiece W is rotated around the axis of rotation Q1. Also, as shown in FIG. 5, for example, the rotation axis Q1 and the first tip surface C1 of the cutting tip 2 are set to be located on the same plane when viewed from the axial direction of the rotation axis Q1. Each block surface B1 to B3 of the head block 3a is kept at a position separated from the workpiece W. In this state, the processing point C4 of the cutting tip 2 held by the cutting tip holder 3 is brought into contact with the surface of the workpiece W. As an example, the cutting tool 1 is moved in a cutting direction Q2, which is the axial direction of the rotation axis Q1, while being in contact with the workpiece W. As a result, a predetermined area of ​​the workpiece W is cut by the cutting tool 1.

[0048] Coolant is supplied to the coolant flow path R3 of the cutting tool 1. The coolant is ejected from the respective outlets 33a to 33c, 34a, and 35a of the first coolant nozzle 33 and the second coolant nozzles 34 and 35. The coolant is supplied toward the respective tip faces C1 to C3 of the cutting tip 2, and cools the processing point C4.

[0049] According to the cutting tool 1, abundant coolant is sprayed from the first coolant nozzle 33 and the second coolant nozzles 34, 35 and supplied toward each of the tip faces C1 to C3 of the cutting tip 2. The first coolant nozzle 33 supplies coolant toward the first tip face C1. The second coolant nozzles 34, 35 supply coolant toward the second tip face C2 and the third tip face C3.

[0050] According to the above configuration, even if it is difficult to cool the cutting tip only with the coolant sprayed from the first coolant nozzle 33 toward the first tip face C1, the processing point C4 of the cutting tip 2 can be cooled from different directions by the coolant sprayed from the second coolant nozzles 34 and 35 toward the second tip face C2 and the third tip face C3. Therefore, the cooling effect of the cutting tip 2 can be improved.

[0051] The improved cooling effect of the cutting tip 2 can, for example, suppress wear of the base material of the cutting tip 2. Furthermore, in the case where the cutting tip 2 has a coating, peeling of the coating can be prevented.

[0052] (First Modification) Modifications of this embodiment will be described below. Fig. 6 is a partial view showing the cutting tip 2 attached to a cutting tool 101 according to a first modification and the configuration around the cutting tip 2.

[0053] As shown in Fig. 6, the head block 103a of the cutting holder 103 according to the first modification has a shape in which the first block face B1 is visible, but the second block face B2 and the third block face B3 are not visible, when viewed from one direction (for example, the normal direction Z of the first chip face C1). Furthermore, when viewed from the one direction, the at least one second coolant nozzle (for example, a pair of second coolant nozzles 34, 35) is disposed in a position where it is not visible. As a result, when viewed from the one direction, one or more outlets of the at least one second coolant nozzle (for example, outlets 34a, 35a) are also disposed in a position where they are not visible.

[0054] According to the above configuration, the amount by which the second coolant nozzle protrudes outward from at least one of the second block face B2 and the third block face B3 can be reduced. As a result, the second coolant nozzle is prevented from interfering with the workpiece W and chips. Therefore, the coolant from the second coolant nozzle can be stably supplied to at least one of the second tip face C2 and the third tip face C3.

[0055] (Second Modification) Fig. 7 is a partial view of a cutting tool 201 according to a second modified example. Fig. 7 shows an enlarged view of a portion of the third block face B3 of the cutting tool 201 (cutting tip holder 203). The head block 203a of the cutting tip holder 203 according to the second modified example has a coolant groove 203h arranged on at least one of the second block face B2 and the third block face B3.

[0056] As shown in Fig. 7, the coolant groove 203h extends from a second coolant nozzle (second coolant nozzle 35 in the example shown in Fig. 7) disposed on the block surface toward the cutting tip 2. At least a part of the outlet of the second coolant nozzle (outlet 35a in the example shown in Fig. 7) is located inside the coolant groove 203h.

[0057] According to the above configuration, for example, by ejecting the coolant from the outlet of the second coolant nozzle into the inside of the coolant groove 203h, the coolant that has passed through the coolant groove 203h can be brought into accurate contact with the second tip surface C2 or the third tip surface C3 of the cutting tip 2. As a result, the cooling effect of the cutting tip 2 can be further improved.

[0058] As described above, the embodiment and the modified example have been described as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. have been made as appropriate. In addition, it is also possible to combine the components described in the embodiment and the modified example to form a new embodiment. For example, a part of the configuration in one embodiment may be applied to another configuration, and a part of the configuration in an embodiment can be separated from the other configurations in the embodiment and arbitrarily extracted. In addition, the components described in the attached drawings and detailed description include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the technology.

[0059] (Disclosure items) Each of the following sections is a disclosure of a preferred embodiment.

[0060] [Item 1] A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, each surface disposed adjacent the other two surfaces, a head block to which the cutting tip is attached; a first coolant nozzle including at least one outlet; at least one second coolant nozzle including at least one outlet; The head block includes: a first block face, a second block face, and a third block face, each face being disposed adjacent to the other two faces; a mounting structure in which the cutting tip is mounted in a position in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface, the first coolant nozzle is attached to the first block surface of the head block, and the second coolant nozzle is attached to at least one of the second block surface and the third block surface of the head block, A cutting tip holder, wherein the at least one outlet of the first coolant nozzle is arranged toward the first tip surface of the cutting tip, and the at least one outlet of the second coolant nozzle is arranged toward the second tip surface or the third tip surface of the cutting tip.

[0061] According to the above configuration, the cutting tip held by the cutting tip holder can be cooled by abundant coolant sprayed from the first coolant nozzle and the second coolant nozzle. Also, even if it is difficult to cool the cutting tip only with the coolant sprayed from the first coolant nozzle toward the first tip surface, the cutting tip can be cooled by the coolant sprayed from the second coolant nozzle toward the second tip surface or the third tip surface. Therefore, the cooling effect of the cutting tip can be improved.

[0062] [Item 2] 2. The cutting tip holder according to item 1, wherein the at least one second coolant nozzle includes a pair of second coolant nozzles attached to the second block surface and the third block surface of the head block, and the at least one outlet of the pair of second coolant nozzles is arranged toward the second tip surface and the third tip surface of the cutting tip.

[0063] According to the above configuration, the pair of second coolant nozzles can be used to supply coolant to both the second tip surface and the third tip surface to cool the cutting tip, thereby further improving the cooling effect of the cutting tip.

[0064] [Item 3] 3. The cutting tip holder according to item 1 or 2, wherein of the outlet of the first coolant nozzle and the outlet of the second coolant nozzle, at least the outlet of the second coolant nozzle is directed toward a machining point located at a boundary between the first tip surface, the second tip surface, and the third tip surface of the cutting tip.

[0065] According to the above configuration, the machining point, which is the contact portion of the cutting tip with the workpiece, can be efficiently cooled by the coolant sprayed from at least the second coolant nozzle.

[0066] [Item 4] 4. The cutting tip holder according to any one of items 1 to 3, wherein a shortest distance between the second coolant nozzle and a processing point located at a boundary between the first tip surface, the second tip surface, and the third tip surface of the cutting tip is longer than a shortest distance between the first coolant nozzle and the processing point.

[0067] According to the above configuration, the second coolant nozzle is disposed farther away from the machining point of the cutting tip than the first coolant nozzle, so that it is possible to prevent the second coolant nozzle from interfering with the workpiece, chips, etc. Therefore, the coolant from the second coolant nozzle can be stably supplied toward at least either the second tip surface or the third tip surface.

[0068] [Item 5] 5. The cutting tip holder according to any one of claims 1 to 4, wherein, as viewed from the normal direction of the first tip surface, the at least one outlet of the first coolant nozzle includes a plurality of outlets arranged at a plurality of different positions.

[0069] According to the above configuration, the cooling effect of the cutting tip can be improved by discharging a large amount of coolant in different directions from the multiple discharge ports of the first coolant nozzle. Also, the amount of protrusion of the first coolant nozzle from the first block surface can be reduced. Therefore, the cutting tip holder can be made compact.

[0070] [Item 6] 6. The cutting tip holder according to any one of items 1 to 5, wherein the head block has a shape in which, when viewed from one direction, the first block surface is visible and the second block surface and the third block surface are not visible.

[0071] According to the above configuration, the amount of outward protrusion of the second block surface and the third block surface of the head block can be reduced, thereby preventing the head block from interfering with the workpiece, chips, etc. Therefore, the coolant from the second coolant nozzle can be stably supplied to at least either the second tip surface or the third tip surface.

[0072] [Item 7] the at least one second coolant nozzle includes a pair of second coolant nozzles attached to the second block surface and the third block surface of the head block, respectively; 7. The cutting tip holder according to any one of items 1 to 6, wherein, when viewed from one direction, the entirety of each of the pair of second coolant nozzles is disposed inside a region that includes the first block surface and is sandwiched between a pair of orthogonal straight lines that pass through a machining point that is located on a boundary between the first tip surface, the second tip surface, and the third tip surface of the cutting tip as an intersection point and are symmetrically disposed with respect to an axis of symmetry of the second block surface and the third block surface.

[0073] According to the above configuration, the amount by which the pair of second coolant nozzles protrude outward from both the second block surface and the third block surface can be reduced, thereby preventing the pair of second coolant nozzles from interfering with the workpiece, chips, etc. Therefore, coolant from the pair of second coolant nozzles can be stably supplied toward both the second tip surface and the third tip surface.

[0074] [Item 8] 8. The cutting tip holder according to item 7, wherein, when viewed from the one direction, the entirety of each of the pair of second coolant nozzles is disposed between a plane including the second tip surface that is symmetrically disposed with respect to the axis of symmetry of the second tip surface and the third tip surface of the cutting tip within the region, and a plane including the third tip surface.

[0075] According to the above configuration, the amount by which the pair of second coolant nozzles protrude outward from both the second block surface and the third block surface can be further reduced, which further reduces interference between the pair of second coolant nozzles and the workpiece, chips, etc. Therefore, coolant from the pair of second coolant nozzles can be stably supplied toward both the second tip surface and the third tip surface.

[0076] [Item 9] Item 88. The cutting tip holder according to any one of items 1 to 87, wherein an angle between the first block surface and the second block surface, and an angle between the first block surface and the third block surface, are values ​​in a range less than 90°.

[0077] According to the above configuration, the amount by which the second coolant nozzle protrudes outward from both the second block face and the third block face when viewed from the normal direction of the first tip face of the cutting tip can be reduced, so that the second coolant nozzle can be effectively prevented from interfering with the workpiece, chips, etc. Therefore, the coolant from the pair of second coolant nozzles can be stably supplied toward at least one of the second tip face or the third tip face.

[0078] [Item 10] the head block has a shape in which, when viewed from one direction, the first block surface is visible, and the second block surface and the third block surface are not visible, 10. The cutting tip holder according to any one of items 1 to 9, wherein the at least one second coolant nozzle is disposed at a position where it is not visible when viewed from the one direction.

[0079] According to the above configuration, it is possible to suppress the amount by which the second coolant nozzle protrudes outward from at least one of the second block face and the third block face, and to suppress the second coolant nozzle from interfering with the workpiece, chips, etc. Therefore, it is possible to stably supply coolant from the second coolant nozzle toward at least one of the second tip face and the third tip face.

[0080] [Item 11] A coolant flow path is provided through which the coolant flows. The coolant flow path is a first flow path through which a coolant supplied from an outside flows; a second flow passage branching from the first flow passage and extending toward the first coolant nozzle; and at least one third flow path branching off from the first flow path and extending toward the second coolant nozzle.

[0081] According to the above configuration, a common flow passage can be used to supply coolant to both the first coolant nozzle and the second coolant nozzle, making the coolant flow passage compact and simple.

[0082] [Item 12] Item 12. The cutting tip holder according to item 11, wherein the coolant passage is disposed inside the head block.

[0083] According to the above-mentioned configuration, the cutting tip holder can be made more compact than when the coolant flow passage is disposed outside the head block. Also, since the coolant flow passage can be protected from the outside, the coolant can be stably supplied to the surface of the cutting tip.

[0084] [Item 13] 13. The cutting tip holder according to any one of items 1 to 12, wherein at least one of the first coolant nozzle and the second coolant nozzle is detachably attached to the head block.

[0085] According to the above configuration, at least one of the first coolant nozzle and the second coolant nozzle can be easily detached from the head block and replaced depending on the cutting tip, so that the cooling effect of the coolant can be stably obtained depending on the cutting tip.

[0086] [Item 14] 14. The cutting tip holder according to any one of items 1 to 13, wherein the head block is disposed on at least one of the second block surface and the third block surface, and has a coolant groove extending from the second coolant nozzle disposed on the block surface toward the cutting tip, and at least a portion of the outlet of the second coolant nozzle is located inside the coolant groove.

[0087] According to the above configuration, by ejecting the coolant into the coolant groove, the coolant passing through the coolant groove can be supplied to the second tip surface or the third tip surface of the cutting tip while preventing the coolant from interfering with the block surface, thereby further improving the cooling effect of the cutting tip.

[0088] [Item 15] A cutting tip holder according to any one of items 1 to 14, The cutting tip.

[0089] According to the above configuration, a cutting tool can be configured that improves the cooling effect of the cutting tip and can perform stable cutting work while maintaining the cutting tip in a state suitable for cutting. [Explanation of symbols]

[0090] B1 1st block surface B2 2nd block surface B3 3rd block surface C1 First chip surface C2 Second chip surface C3 3rd chip surface C4 Machining point R3 Coolant passage R31 First coolant passage R32 Second coolant passage R33, R34 3rd coolant passage S Symmetry axis 1, 101, 201 cutting tools 2 Cutting tip 3, 103, 203 Cutting tip holder 3a, 103a, 203a head block 3c Mounting structure 33 First coolant nozzle 33a, 33b, 33c, 34a, 35a outlet 34, 35 Second coolant nozzle 203h Coolant groove

Claims

1. A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, a head block to which the cutting tip is attached; a first coolant nozzle including a discharge port; a second coolant nozzle including a discharge port, the head block includes a first block surface, a second block surface, and a third block surface; the cutting tip is attached to the head block in an orientation in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface; When viewed from a normal direction of the first block surface, the first coolant nozzle is positioned to overlap the first block surface, the second coolant nozzle is positioned so as to overlap with a specific block face, which is at least one of the second block face and the third block face, when viewed from a normal direction of the specific block face, the discharge port of the first coolant nozzle faces the first tip surface, when a direction from the first tip surface toward a surface opposite to the first tip surface is defined as downward in a normal direction of the first tip surface, the discharge port of the second coolant nozzle is located below a machining point located at a boundary between the first tip surface, the second tip surface, and the third tip surface, and is separated from the machining point along the specific block surface as viewed from the normal direction of the first tip surface, a cutting tip holder in which the entire second coolant nozzle is disposed within an area that includes the first block surface and is sandwiched between a pair of orthogonal straight lines that pass through the machining point as an intersection and are symmetrically disposed with respect to an axis of symmetry of the second block surface and the third block surface, when viewed from the normal direction of the first tip surface.

2. A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, a head block to which the cutting tip is attached; a first coolant nozzle including a discharge port; a second coolant nozzle including a discharge port, the head block includes a first block surface, a second block surface, and a third block surface; the cutting tip is attached to the head block in an orientation in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface; When viewed from a normal direction of the first block surface, the first coolant nozzle is positioned to overlap the first block surface, the second coolant nozzle is positioned so as to overlap with a specific block face, which is at least one of the second block face and the third block face, when viewed from a normal direction of the specific block face, the discharge port of the first coolant nozzle faces the first tip surface, when a direction from the first tip surface toward a surface opposite to the first tip surface is defined as downward in a normal direction of the first tip surface, the discharge port of the second coolant nozzle is located below a machining point located at a boundary between the first tip surface, the second tip surface, and the third tip surface, and is separated from the machining point along the specific block surface as viewed from the normal direction of the first tip surface, A cutting tip holder, wherein the entire second coolant nozzle is disposed between a plane including the second tip surface and a plane including the third tip surface when viewed from the normal direction of the first tip surface.

3. A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, a head block to which the cutting tip is attached; a first coolant nozzle including a discharge port; a second coolant nozzle including a discharge port, the head block includes a first block surface, a second block surface, and a third block surface; a tip seating surface facing a surface of the cutting tip opposite to the first tip surface, the cutting tip is attached to the head block in an orientation in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface; When viewed from a normal direction of the first block surface, the first coolant nozzle is positioned to overlap the first block surface, the second coolant nozzle is positioned so as to overlap with a specific block face, which is at least one of the second block face and the third block face, when viewed from a normal direction of the specific block face, the discharge port of the first coolant nozzle faces the first tip surface, when a direction from the first tip surface toward a surface opposite to the first tip surface is defined as downward in a normal direction of the first tip surface, the discharge port of the second coolant nozzle is located below a machining point located at a boundary between the first tip surface, the second tip surface, and the third tip surface, and is separated from the machining point along the specific block surface as viewed from the normal direction of the first tip surface, a cutting tip holder, wherein an upper end of the discharge port of the second coolant nozzle is positioned below the tip seat surface.

4. A cutting chip holder described in any one of claims 1 to 3, wherein the outlet of the second coolant nozzle is positioned at a position where the coolant contacts the second chip surface or the third chip surface.

5. A cutting chip holder described in any one of claims 1 to 3, wherein the outlet of the second coolant nozzle faces the machining point and the second chip surface or the third chip surface.

6. The specific block surface has a planar area extending linearly when viewed from a normal direction of the first chip surface, the second coolant nozzle includes a protruding portion protruding outward from the flat area of ​​the specific block face, The cutting tip holder according to any one of claims 1 to 3, wherein the outlet of the second coolant nozzle is arranged at a position spaced apart from the flat area of ​​the specific block face of the protrusion.

7. the second coolant nozzle is a pair of second coolant nozzles, one of the pair of second coolant nozzles is positioned to overlap the second block surface, which is the specific block surface, when viewed in a normal direction of the second block surface, and the other of the pair of second coolant nozzles is positioned to overlap the third block surface, which is the specific block surface, when viewed in a normal direction of the third block surface, The cutting tip holder according to any one of claims 1 to 3, wherein the outlet of one of the pair of second coolant nozzles faces the second tip surface, and the outlet of the other of the pair of second coolant nozzles faces the third tip surface.

8. The cutting tip holder according to any one of claims 1 to 3, wherein the outlet of the first coolant nozzle faces the machining point.

9. The cutting tip holder according to any one of claims 1 to 3, wherein the shortest distance between the second coolant nozzle and the machining point is longer than the shortest distance between the first coolant nozzle and the machining point.

10. The cutting tip holder according to any one of claims 1 to 3, wherein, when viewed from a normal direction of the first tip surface, the outlet of the first coolant nozzle includes a plurality of outlets arranged at different positions.

11. The cutting tip holder according to any one of claims 1 to 3, wherein the head block has a shape in which, when viewed from a normal direction of the first tip surface, the first block surface is visible, and the second block surface and the third block surface are not visible.

12. 4. The cutting tip holder according to claim 1, wherein an angle between the first block surface and the second block surface and an angle between the first block surface and the third block surface are values ​​in a range of less than 90 degrees.

13. A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, a head block to which the cutting tip is attached; a first coolant nozzle including a discharge port; a second coolant nozzle including a discharge port, the head block includes a first block surface, a second block surface, and a third block surface; the cutting tip is attached to the head block in an orientation in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface; When viewed from a normal direction of the first block surface, the first coolant nozzle is positioned to overlap the first block surface, the second coolant nozzle is positioned so as to overlap with a specific block face, which is at least one of the second block face and the third block face, when viewed from a normal direction of the specific block face, the discharge port of the first coolant nozzle faces the first tip surface of the cutting tip, the discharge port of the second coolant nozzle faces the second tip surface or the third tip surface of the cutting tip, A cutting tip holder is arranged at a position where the second coolant nozzle is not visible when viewed from the normal direction of the first tip surface.

14. It has a coolant flow path through which coolant flows, The coolant flow path is a first flow path through which a coolant supplied from an external source flows; a second flow path branching from the first flow path and extending toward the first coolant nozzle; a third flow path branching from the first flow path and extending toward the second coolant nozzle;

15. 4. The cutting tip holder according to claim 1, wherein at least one of the first coolant nozzle and the second coolant nozzle is detachably attached to the head block.

16. the head block is disposed on the specific block surface and has a coolant groove extending from the second coolant nozzle toward the cutting tip; 4. The cutting tip holder according to claim 1, wherein at least a portion of the outlet of the second coolant nozzle is located inside the coolant groove.

17. A cutting tip holder that holds a cutting tip having a first tip surface, a second tip surface, and a third tip surface, a head block to which the cutting tip is attached; a first coolant nozzle including a discharge port; a pair of second coolant nozzles each including a discharge port; the head block includes a first block surface, a second block surface, and a third block surface; the cutting tip is attached to the head block in an orientation in which the first block surface is visible when viewed from a normal direction of the first tip surface, the second block surface is visible when viewed from a normal direction of the second tip surface, and the third block surface is visible when viewed from a normal direction of the third tip surface; When viewed from a normal direction of the first block surface, the first coolant nozzle is positioned to overlap the first block surface, one of the pair of second coolant nozzles is positioned to overlap the second block surface when viewed from a direction normal to the second block surface, and the other of the pair of second coolant nozzles is positioned to overlap the third block surface when viewed from a direction normal to the third block surface; the discharge port of the first coolant nozzle faces the first tip surface, when a direction from the first tip surface toward a surface opposite to the first tip surface is defined as a downward direction among normal directions of the first tip surface, the discharge ports of the pair of second coolant nozzles are located below a machining point located at a boundary between the first tip surface, the second tip surface, and the third tip surface, a cutting tip holder, wherein, when viewed from a normal direction of the first tip surface, the outlet of one of the pair of second coolant nozzles is separated from the machining point along the second block surface, and the outlet of the other of the pair of second coolant nozzles is separated from the machining point along the third block surface.

18. A cutting tip holder according to any one of claims 1 to 3, 13 and 17; The cutting tip.

Images