Cutting insert 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 a cutting tool holder and a cutting tool.

Background Art

[0002] A cutting tool including a cutting insert and a cutting tool holder for holding the cutting insert, and cutting the workpiece with the cutting insert is known. The cutting insert is held by the cutting tool holder with the rake face and the flank face exposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a cutting tool, the temperature of the cutting insert may increase during cutting of the workpiece, which may affect the life of the cutting insert. For this reason, for example, as disclosed in Patent Document 1, measures are taken to cool the cutting insert with a coolant. However, since it is difficult for the coolant to reach the cutting insert due to the workpiece and chips, etc., there is a problem that the cutting insert is difficult to be cooled.

[0005] Therefore, an object of one aspect of the present disclosure is to provide a cutting tool holder capable of efficiently cooling a cutting insert with a coolant, and a cutting tool.

Means for Solving the Problems

[0006] A cutting tool holder according to an aspect of the present disclosure holds a cutting tool having a first chip surface, a second chip surface, and a third chip surface, each surface being disposed adjacent to the other two surfaces, the cutting tool holder comprising: a head block to which the cutting tool is attached; a first coolant nozzle including at least one discharge port; and at least one second coolant nozzle including at least one discharge port, the head block having a first block surface, a second block surface, and a third block surface, each surface being disposed adjacent to the other two surfaces, and a mounting structure for mounting the cutting tool in a posture in which the first block surface is visible when viewed from the normal direction of the first chip surface, the second block surface is visible when viewed from the normal direction of the second chip surface, and the third block surface is visible when viewed from the normal direction of the third chip surface, the first coolant nozzle being attached to the first block surface of the head block, the second coolant nozzle being attached to at least one of the second block surface or the third block surface of the head block, the at least one discharge port of the first coolant nozzle being disposed facing the first chip surface of the cutting tool, and the at least one discharge port of the second coolant nozzle being disposed facing the second chip surface or the third chip surface of the cutting tool.

Advantages of the Invention

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

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment) Hereinafter, embodiments will be described with reference to the drawings. The normal direction of the first chip face, the normal direction of the second chip face, and the normal direction of the third chip face mentioned below indicate the directions in a state where the cutting chip 2 is attached to the cutting chip 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 chip 2 and a cutting chip holder 3 that holds the cutting chip 2. The cutting tool 1 removably holds the cutting chip 2. The cutting tool 1 is mounted, for example, on a cutting device that lathe-processes a workpiece W by bringing the cutting tool 1 into contact with the workpiece W while rotating the workpiece W. The heat of the cutting chip 2 generated during the cutting operation is cooled by a coolant supplied to the cutting chip 2. As will be described in detail later, in the cutting tool 1, the cooling effect of the cutting chip 2 is improved by supplying the coolant toward each chip face C1 to C3 of the cutting chip 2.

[0011] The cutting tip 2 contains a hard material such as cemented carbide. The cutting tip 2 has a first chip surface C1, a second chip surface C2, and a third chip surface C3, each surface being arranged adjacent to the other two surfaces. The first chip surface C1 is also referred to as a rake face. The second chip surface C2 and the third chip surface C3 are also referred to as flank faces. The cutting tip 2 of the present embodiment has a rectangular parallelepiped shape in which the first chip surface C1, the second chip surface C2, and the third chip surface C3 are rectangular when viewed from their respective normal directions.

[0012] The cutting tip 2 also has a machining point C4 located at the boundary of the first chip surface C1, the second chip surface C2, and the third chip surface C3. The machining point C4 is also referred to as a corner or a cutting edge. The machining point C4 contacts the workpiece W. The cutting tip 2 also has a through hole 2a extending in the normal direction Z of the first chip surface C1. A fixing member 31 of a cutting tip holder 3 described later is inserted into the through hole 2a.

[0013] The machining point C4 does not have to be a precise point. Also, when viewed from the normal direction Z of the first chip surface 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 case of a cylindrical cutting tip 2, in a state where the machining point C4 is in contact with the workpiece W, when viewed from the normal direction Z of the first chip surface C1, among the circumferential surface regions of the cylindrical shape, the region located on one side of the machining point C4 functions as the second chip surface C2, and the region located on the other side of the machining point C4 functions as the third chip surface C3. That is, the circumferential surface of the cylindrical cutting tip 2 includes the second chip surface C2 and the third chip surface C3.

[0015] The cutting tool holder 3 has a head block 3a and a mounting block 3b. The cutting tool 2 is attached to the head block 3a. The head block 3a has a first block surface B1, a second block surface B2, and a third block surface B3, each surface being arranged adjacent to the other two surfaces. In the present embodiment, as an example, the first block surface B1 and the first chip surface C1 are parallel planes. Also, the second block surface B2 and the second chip surface C2 are parallel planes. Also, the third block surface B3 and the third chip surface C3 are parallel planes. The configuration of the head block 3a is not limited to this. For example, at least any one of the block surfaces B1 to B3 may be curved or spherical, or may include a plurality of surfaces.

[0016] The head block 3a has a mounting structure 3c to which the cutting tool 2 is attached. In the mounting structure 3c, the first block surface B1 is visible when viewed from the normal direction Z of the first chip surface C1, the second block surface B2 is visible when viewed from the normal direction X of the second chip surface C2, and the third block surface B3 is visible when viewed from the normal direction Y of the third chip surface C3, and the cutting tool 2 is attached in a posture where it can be seen. The posture in which the block surface is visible when viewed from the normal direction of the chip surface means that when attaching the cutting tool 2, an average operator can view the block surface when viewed from the normal direction of the chip surface, and any posture that enables cutting work with the cutting tool is acceptable.

[0017] The head block 3a has a chip seating surface 3d that faces the surface on the opposite side of the first chip surface C1 of the cutting tool 2 via a sheet member 30 described later. The chip seating surface 3d is arranged at the tip portion of the head block 3a where the second block surface B2 and the third block surface B3 are adjacent when viewed from the normal direction Z of the first chip surface C1. An insertion hole 3e into which the tip portion of the fixing member 31 is inserted is provided in the chip seating surface 3d. The chip seating surface 3d and the first chip surface C1 of the present embodiment are parallel planes. Note that the chip seating surface 3d and the first chip surface C1 are not limited to this and may not be parallel planes.

[0018] The mounting structure 3c of the present embodiment has, 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 chip 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 the present embodiment and the first chip surface C1 are parallel planes.

[0019] FIG. 2 is a partial view showing the cutting tip 2 attached to the cutting tool 1 of 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 of 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 a diameter-expanded portion 31b disposed at one end of the shaft portion 31a. The diameter-expanded 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 disposed in a part of the shaft portion 31a and recessed inward in the radial 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 disposed on one end surface in the axial direction and engaging with a fastening tool, and a first screw 32b disposed on the peripheral 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 also has a second screw 3f disposed on the inner peripheral surface of the head block 3a partitioning the second guide path R2 and screwed with the first screw 32b.

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

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

[0024] The cutting chip holder 3 includes a plurality of coolant nozzles. These plurality of coolant nozzles eject a coolant that cools the heat generated in the cutting chip 2. The coolant can be appropriately selected from, for example, liquids, gases, and mixtures thereof. The coolant in the present embodiment contains water.

[0025] The cutting chip holder 3 includes a first coolant nozzle 33 including at least one discharge port. As shown in FIG. 1, the first coolant nozzle 33 is attached to the first block surface B1 of the head block 3a. The at least one discharge port of the first coolant nozzle 33 is disposed facing the first chip surface C1 of the cutting chip 2.

[0026] The cutting tool holder 3 is provided with at least one second coolant nozzle including at least one discharge port. The at least one second coolant nozzle is attached to at least one of the second block surface B2 or the third block surface B3 of the head block 3a. The at least one discharge port of the second coolant nozzle is arranged to face the second chip surface C2 or the third chip surface C3 of the cutting tool 2.

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

[0028] In the cutting tool holder 3 of the present embodiment, among the discharge ports of the first coolant nozzle 33 and the discharge ports of the second coolant nozzles 34 and 35, at least the discharge ports of the second coolant nozzles 34 and 35 are directed toward the machining point C4. In the present embodiment, as an example, all of the discharge ports of the first coolant nozzle 33 and the discharge ports of the second coolant nozzles 34 and 35 are directed toward the machining point C4 of the cutting tool 2.

[0029] The at least one discharge port of the first coolant nozzle 33 includes, for example, a plurality of discharge ports 33a to 33c. As shown in FIG. 2, when viewed from the normal direction Z of the first chip surface C1, the plurality of discharge ports 33a to 33c are arranged at a plurality of different positions. Thereby, a rich coolant is discharged from the plurality of discharge ports 33a to 33c toward the machining point C4 from mutually different directions. The first coolant nozzle 33 of the present embodiment is arranged at a position protruding outward from the first block surface B1. Thereby, the coolant jetted from the discharge ports 33a to 33c toward the first chip surface C1 can easily reach the machining point C4 of the cutting tool 2.

[0030] The pair of second coolant nozzles 34 and 35 each have, as an example, one discharge port 34a and 35a. Coolant is discharged from each of the discharge ports 34a and 35a of the pair of second coolant nozzles 34 and 35 toward the machining point C4 from different directions. The second coolant nozzle 34 of the present embodiment is disposed at a position protruding outward from the second block surface B2. Thereby, the coolant ejected from the discharge port 34a toward the second chip surface C2 can easily reach the machining point C4 of the cutting tip 2. Further, the second coolant nozzle 35 of the present embodiment is disposed at a position protruding outward from the third block surface B3. Thereby, the coolant ejected from the discharge port 35a toward the third chip surface C3 can easily reach the machining point C4 of the cutting tip 2.

[0031] The discharge ports 33a to 33c of the present embodiment have, as an example, the same inner diameter. Also, as an example, the discharge ports 34a and 35a have the same inner diameter. The inner diameters of the discharge ports 34a and 35a of the present embodiment are larger than the inner diameters of the discharge ports 33a to 33c. Note that the inner diameters of the discharge ports 34a and 35a may be smaller than the inner diameters of the discharge ports 33a to 33c, or may be the same as the inner diameters of the discharge ports 33a to 33c.

[0032] In the cutting tip holder 3 of the present embodiment, as an example, the shortest distance between the second coolant nozzles 34 and 35 and the machining point C4 is longer than the shortest distance between the first coolant nozzle 33 and the machining point C4. Thereby, when the machining point C4 is in contact with the workpiece W, interference between the second coolant nozzles 34 and 35 and the workpiece W and chips is suppressed. Therefore, the coolant from the second coolant nozzles 34 and 35 can be stably supplied toward the second chip surface C2 and the third chip surface C3. As an example, when the first chip surface C1 is a horizontal plane, the discharge ports 34a and 35a are disposed at positions below the first chip surface C1 (see FIG. 5).

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

[0034] When viewed from the one direction, the entire body of each of the pair of second coolant nozzles 34 and 35 may be disposed inside a region A, which will be described later, of the head block 3a. The pair of second coolant nozzles 34 and 35 are symmetrically disposed inside the region A with respect to the symmetry axis S of the second block surface B2 and the third block surface B3.

[0035] The head block 3a of the present embodiment may have a shape in which the first block surface B1 is visible and the second block surface B2 and the third block surface B3 are not visible when viewed from the one direction, and the entire body of each of the pair of second coolant nozzles 34 and 35 may be disposed inside the region A.

[0036] The region A is a region that includes the first block surface B1 sandwiched between the straight lines L1 and L2 when viewed from the one direction. The straight lines L1 and L2 are a pair of orthogonal straight lines when viewed from the one direction (that is, the angle between the straight line L1 and the straight line L2 is 90°), and pass through the machining point C4 of the cutting tip 2 and are symmetrically disposed with respect to the symmetry axis S of the second block surface B2 and the third block surface B3.

[0037] According to the above configuration, it is possible to suppress interference between the second block surface B2, the third block surface B3, and the second coolant nozzles 34 and 35 with the workpiece W, chips, etc. Therefore, the coolant from the second coolant nozzles 34 and 35 can be stably supplied toward the second chip surface C2 and the third chip surface C3. Note that the arrangement of the pair of second coolant nozzles 34 and 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 and 35 may be disposed outside the region A. Also, when viewed from the one direction, the pair of second coolant nozzles 34 and 35 may be asymmetrically disposed inside the region A with respect to the symmetry axis S.

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

[0039] According to the above configuration, since the amount of protrusion of the second coolant nozzles 34 and 35 outward from the block surfaces B2 and B3 is suppressed, interference of the pair of second coolant nozzles 34 and 35 with the workpiece W and chips or the like is suppressed. Therefore, the coolant from the second coolant nozzles 34 and 35 can be stably supplied toward the second chip surface C2 and the third chip surface C3. Note that the arrangement of the pair of second coolant nozzles 34 and 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 and 35 may be disposed outside between the planes P1 and P2. Also, the pair of second coolant nozzles 34 and 35 may be asymmetrically arranged between the plane P1 and the plane P2 with respect to the symmetry axis S when viewed from the one direction. Further, the angle between the plane P1 and the plane P2 may be a value within a range of 90° or more.

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

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

[0042] The second flow path R32 branches off from the first flow path R31 and extends toward the first coolant nozzle 33. The at least one third flow path of the present embodiment includes, as an example, a pair of third flow paths R33 and R34. The third flow path R33 branches off from the first flow path R31 and extends toward the second coolant nozzle 35. The third flow path R34 branches off from the first flow path R31 and extends toward the second coolant nozzle 34. The coolant flow path R3 of the present embodiment is disposed, as an example, inside the head block 3a. Thereby, the cutting tool holder 3 can be made compact. Note that all or part of the coolant flow path R3 may be provided outside the head block 3a.

[0043] The head block 3a of the present embodiment has, as an example, values of the angle between the first block surface B1 and the second block surface B2 and the angle between the first block surface B1 and the third block surface B3 within a range of less than 90°. The angle is, for example, a value within a range of 45° or more and 80° or less.

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

[0045] Note that the arrangement of these block surfaces B1 to B3 is not limited to this. For example, the head block 3a may have an angle between the first block surface B1 and the second block surface B2, or an angle between the first block surface B1 and the third block surface B3, which is a value in the range of 90° or more. In this case, the angle between the first block surface B1 and the second block surface B2, or the angle between the first block surface B1 and the third block surface 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 seen from the first chip surface C1 side of the cutting tool 1 in FIG. 1 during the cutting operation. In FIG. 4, as an example, it shows a state where the cylindrical workpiece W rotates while the cutting tool 1 performs lathe machining on the workpiece W by outer diameter machining. FIG. 5 is a partial view seen from the second chip surface C2 side of the cutting tool 1 in FIG. 1 during the cutting operation. When the cutting tool 1 is used, the mounting block 3b of the cutting tool 1 is attached to the cutting device.

[0047] As shown in FIG. 4, as an example, the workpiece W is rotated around the axis of the rotation axis Q1. Further, as shown in FIG. 5, as an example, it is set such that the rotation axis Q1 and the first chip surface C1 of the cutting tip 2 are 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 machining 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 while being in contact with the workpiece W in the cutting direction Q2 which is the axial direction of the rotation axis Q1. Thereby, a predetermined region of the workpiece W is cut by the cutting tool 1.

[0048] Coolant is supplied to the coolant passage R3 in the cutting tool 1. The coolant is ejected from the discharge ports 33a to 33c, 34a, 35a of the first coolant nozzle 33 and the second coolant nozzles 34 and 35. The coolant is supplied toward each chip surface C1 to C3 of the cutting tip 2 to cool the machining point C4.

[0049] According to the cutting tool 1, a rich amount of coolant ejected from the first coolant nozzle 33 and the second coolant nozzles 34 and 35 is supplied toward each chip surface C1 to C3 of the cutting tip 2. The first coolant nozzle 33 supplies coolant toward the first chip surface C1. The second coolant nozzles 34 and 35 supply coolant toward the second chip surface C2 and the third chip surface C3.

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

[0051] By improving the cooling effect of the cutting tip 2, for example, wear of the base material of the cutting tip 2 can be suppressed. Further, when the cutting tip 2 has a coating, peeling of the coating can be prevented.

[0052] (First Modified Example) Hereinafter, a modified example of the present embodiment will be described. FIG. 6 is a partial view showing the cutting tip 2 attached to the cutting tool 101 according to the first modified example 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 modified example has a shape in which the first block surface B1 is visible and the second block surface B2 and the third block surface B3 are not visible when viewed from one direction (for example, the normal direction Z of the first chip surface C1). Also, 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 at a position where it is not visible. As a result, when viewed from the one direction, among the at least one second coolant nozzle, the discharge ports (for example, discharge ports 34a, 35a) of one or a plurality of second coolant nozzles are also disposed at positions where they are not visible.

[0054] According to the above configuration, it is possible to suppress the amount of protrusion of the second coolant nozzle outward from at least one of the second block surface B2 and the third block surface B3. As a result, it is possible to suppress the second coolant nozzle 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 chip surface C2 and the third chip surface C3.

[0055] (Second Modified Example) FIG. 7 is a partial view of the cutting tool 201 according to the second modified example. In FIG. 7, a part of the third block surface B3 of the cutting tool 201 (cutting tip holder 203) is shown enlarged. The head block 203a of the cutting tip holder 203 according to the second modified example has a coolant groove 203h disposed on at least one of the second block surface B2 and the third block surface B3.

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

[0057] According to the above configuration, for example, by ejecting the coolant from the discharge port of the second coolant nozzle into the inside of the coolant groove 203h, the coolant passing through the coolant groove 203h can be accurately brought into contact with the second chip surface C2 or the third chip 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 embodiments and the modified examples have been described as examples of the technique disclosed in the present application. However, the technique in the present disclosure is not limited to this, and is also applicable to embodiments in which changes, replacements, additions, omissions, etc. are appropriately made. Further, it is also possible to form a new embodiment by combining the respective components described in the embodiments and the modified examples. For example, some configurations in one embodiment may be applied to other configurations, and some configurations in an embodiment can be arbitrarily extracted separately from other configurations in the embodiment. Further, among the components described in the accompanying drawings and the detailed description, there are not only components essential for solving the problems, but also components not essential for solving the problems for exemplifying the technique.

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

[0060] [Item 1] A cutting tool holder that holds a cutting tip having a first chip surface, a second chip surface, and a third chip surface, each surface being disposed adjacent to the other two surfaces, a head block to which the cutting tip is attached, a first coolant nozzle including at least one discharge port, At least one second coolant nozzle including at least one discharge port. The head block A first block surface, a second block surface, and a third block surface, each surface being arranged adjacent to the other two surfaces. An attachment structure in which the cutting insert is attached in a posture in which the first block surface is visible when viewed from the normal direction of the first chip surface, the second block surface is visible when viewed from the normal direction of the second chip surface, and the third block surface is visible when viewed from the normal direction of the third chip 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 or the third block surface of the head block. At least one discharge port of the first coolant nozzle is arranged facing the first chip surface of the cutting insert, and at least one discharge port of the second coolant nozzle is arranged facing the second chip surface or the third chip surface of the cutting insert. A cutting insert holder.

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

[0062] [Item 2] 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 at least one discharge port of the pair of second coolant nozzles is arranged facing the second chip surface and the third chip surface of the cutting insert. The cutting insert holder according to Item 1.

[0063] According to the above configuration, by using a pair of second coolant nozzles, coolant can be supplied toward both the second chip surface and the third chip surface to cool the cutting chip. Therefore, the cooling effect of the cutting chip can be further improved.

[0064] [Item 3] Among the discharge port of the first coolant nozzle and the discharge port of the second coolant nozzle, at least the discharge port of the second coolant nozzle is directed toward the machining point located at the boundary of the first chip surface, the second chip surface, and the third chip surface of the cutting chip. The cutting chip holder according to Item 1 or 2.

[0065] According to the above configuration, the machining point, which is the contact portion between the cutting chip and the workpiece, can be efficiently cooled by the coolant ejected from at least the second coolant nozzle.

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

[0067] According to the above configuration, since the second coolant nozzle is arranged at a position farther from the machining point of the cutting chip than the first coolant nozzle, it is possible to suppress 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 one of the second chip surface or the third chip surface.

[0068] [Item 5] When viewed from the normal direction of the first chip surface, the at least one discharge port of the first coolant nozzle includes a plurality of discharge ports arranged at a plurality of different positions. The cutting chip holder according to any one of Items 1 to 4.

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

[0070] [Item 6] 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, and the cutting tip holder according to any one of Items 1 to 5.

[0071] According to the above configuration, since the amount of protrusion of the second block surface and the third block surface of the head block protruding outward can be suppressed, it is possible to suppress the head block from interfering with the workpiece and chips, etc. Therefore, the coolant from the second coolant nozzle can be stably supplied toward at least one of the second chip surface and the third chip surface.

[0072] [Item 7] The at least one second coolant nozzle includes a pair of second coolant nozzles respectively attached to the second block surface and the third block surface of the head block, When viewed from one direction, the entire pair of second coolant nozzles is disposed inside a region including the first block surface sandwiched between a pair of orthogonal straight lines passing through a machining point located at the boundary of the first chip surface, the second chip surface, and the third chip surface of the cutting tip as an intersection point and symmetrically arranged with respect to the symmetry axis of the second block surface and the third block surface, and the cutting tip holder according to any one of Items 1 to 6.

[0073] According to the above configuration, since the amount of protrusion of the pair of second coolant nozzles protruding outward can be suppressed from both the second block surface and the third block surface, it is possible to suppress the pair of second coolant nozzles from interfering with the workpiece and chips. Therefore, the coolant from the pair of second coolant nozzles can be stably supplied to both the second chip surface and the third chip surface.

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

[0075] According to the above configuration, since the amount of protrusion of the pair of second coolant nozzles protruding outward can be further suppressed from both the second block surface and the third block surface, it is possible to further suppress the pair of second coolant nozzles from interfering with the workpiece and chips. Therefore, the coolant from the pair of second coolant nozzles can be stably supplied to both the second chip surface and the third chip surface.

[0076] [Item 9] The cutting tool 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 within a range less than 90°.

[0077] According to the above configuration, when viewed from the normal direction of the first chip surface of the cutting chip, since the amount of protrusion of the second coolant nozzles protruding outward can be reduced from both the second block surface and the third block surface, it is possible to preferably suppress the second coolant nozzles from interfering with the workpiece and chips. Therefore, the coolant from the pair of second coolant nozzles can be stably supplied to at least one of the second chip surface and the third chip surface.

[0078] [Item 10] When viewed from one direction, the head block has a shape in which the first block surface is visible and the second block surface and the third block surface are not visible. The cutting tool 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 of protrusion of the second coolant nozzle outward from at least one of the second block surface and the third block surface, and it is possible to suppress the second coolant nozzle from interfering with the workpiece and chips. Therefore, the coolant from the second coolant nozzle can be stably supplied to at least one of the second chip surface and the third chip surface.

[0080] [Item 11] Comprising a coolant flow path through which coolant flows. The coolant flow path A first flow path through which coolant supplied from the outside flows, A second flow path branching from the first flow path and extending toward the first coolant nozzle, The cutting tool holder according to any one of items 1 to 10, including at least one third flow path branching from the first flow path and extending toward the second coolant nozzle.

[0081] According to the above configuration, it is possible to make the flow paths for supplying coolant to both the first coolant nozzle and the second coolant nozzle common. Therefore, the coolant flow path can be made compact and simplified.

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

[0083] According to the above configuration, the cutting tool holder can be made more compact compared to the case where the coolant flow path is arranged outside the head block. Also, since the coolant flow path can be protected from the outside, coolant can be stably supplied to the surface of the cutting tip.

[0084] [Item 13] The cutting tool 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 according to the cutting tip. Therefore, a stable cooling effect by the coolant can be obtained according to the cutting tip.

[0086] [Item 14] The head block is arranged 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 arranged on the block surface toward the cutting tip, and at least a part of the discharge port of the second coolant nozzle is located inside the coolant groove. The cutting tool holder according to any one of Items 1 to 13.

[0087] According to the above configuration, by ejecting coolant inside the coolant groove, the coolant can be supplied toward the second chip surface or the third chip surface of the cutting tip while suppressing the interference of the coolant with the block surface. Therefore, the cooling effect of the cutting tip can be further improved.

[0088] [Item 15] A cutting tool, comprising: the cutting tool holder according to any one of Items 1 to 14; and the cutting tip.

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

Explanation of reference numerals

[0090] B1 First block surface B2 Second block surface B3 Third block surface C1 First chip surface C2 Second chip surface C3 Third chip surface C4 Machining point R3 Coolant flow path R31 First coolant flow path R32 Second coolant flow path R33, R34 Third coolant flow path S Axis of symmetry 1, 101, 201 Cutting tool 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 Discharge port 34, 35 Second coolant nozzle 203h Coolant groove

Claims

1. A cutting tool holder for holding a cutting tool having a first chip surface, a second chip surface, and a third chip surface, wherein each surface is disposed adjacent to the other two surfaces, comprising: a head block to which the cutting tool is attached; a first coolant nozzle including at least one discharge port; at least one second coolant nozzle including at least one discharge port, wherein the head block has: a first block surface, a second block surface, and a third block surface, each surface being disposed adjacent to the other two surfaces; a mounting structure for mounting the cutting tool in a posture in which the first block surface is visible when viewed from the normal direction of the first chip surface, the second block surface is visible when viewed from the normal direction of the second chip surface, and the third block surface is visible when viewed from the normal direction of the third chip surface; the first coolant nozzle is attached to the first block surface of the head block, and the second coolant nozzle is attached to a specific block surface that is at least one of the second block surface or the third block surface of the head block; the at least one discharge port of the first coolant nozzle is disposed facing the first chip surface of the cutting tool; when the direction from the first chip surface toward the surface opposite to the first chip surface among the normal directions of the first chip surface is defined as downward, the at least one discharge port of the second coolant nozzle is: below the machining point located at the boundary of the first chip surface, the second chip surface, and the third chip surface, and is disposed facing the machining point of the cutting tool and the second chip surface or the third chip surface, and is spaced apart from the machining point along the specific block surface when viewed from the normal direction of the first chip surface; 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 discharge port of the pair of second coolant nozzles is disposed facing the second chip surface and the third chip surface of the cutting tool. A cutting tool holder.

2. The cutting tool holder according to claim 1, wherein the discharge port of the first coolant nozzle is directed toward the machining point.

3. The cutting tool holder according to claim 1, 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.

4. The cutting tool holder according to claim 1, wherein, when viewed from the normal direction of the first chip surface, the at least one discharge port of the first coolant nozzle includes a plurality of discharge ports arranged at a plurality of different positions.

5. The cutting tool holder according to claim 1, 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.

6. A cutting tool holder for holding a cutting tool having a first chip surface, a second chip surface, and a third chip surface, wherein each surface is arranged adjacent to the other two surfaces, a head block to which the cutting tool is attached, a first coolant nozzle including at least one discharge port, and at least one second coolant nozzle including at least one discharge port, wherein the head block has a first block surface, a second block surface, and a third block surface, each of which is arranged adjacent to the other two surfaces, and has a mounting structure in which the cutting tool is attached in a posture such that the first block surface is visible when viewed from the normal direction of the first chip surface, the second block surface is visible when viewed from the normal direction of the second chip surface, and the third block surface is visible when viewed from the normal direction of the third chip surface, and has a chip seating surface facing the surface of the cutting tool opposite to the first chip surface, wherein the first coolant nozzle is attached to the first block surface of the head block, and the second coolant nozzle is attached to a specific block surface that is at least one of the second block surface or the third block surface of the head block, the at least one discharge port of the first coolant nozzle is arranged facing the first chip surface of the cutting tool, when the direction from the first chip surface toward the surface opposite to the first chip surface is defined as downward among the normal directions of the first chip surface, the at least one discharge port of the second coolant nozzle Below the machining point located at the boundary of the first chip surface, the second chip surface, and the third chip surface, and arranged toward the machining point of the cutting chip and the second chip surface or the third chip surface, and when viewed from the normal direction of the first chip surface, it is arranged at a distance from the machining point along the specific block surface. The at least one second coolant nozzle includes a pair of second coolant nozzles respectively attached to the second block surface and the third block surface of the head block. When viewed from one direction, inside the region including the first block surface sandwiched between a pair of orthogonal straight lines passing through the machining point as an intersection point and symmetrically arranged with respect to the symmetry axis of the second block surface and the third block surface, the entirety of each of the pair of second coolant nozzles is arranged at a distance from the chip seating surface and the machining point. A cutting tool holder.

7. When viewed from the one direction, between the plane including the second chip surface symmetrically arranged with respect to the symmetry axis of the second chip surface and the third chip surface of the cutting chip in the region and the plane including the third chip surface, the entirety of each of the pair of second coolant nozzles is arranged. The cutting tool holder according to claim 6.

8. The angle between the first block surface and the second block surface and the angle between the first block surface and the third block surface are values in the range of less than 90°. The cutting tool holder according to claim 1.

9. A cutting tool holder that holds a cutting tool having a first chip surface, a second chip surface, and a third chip surface, each surface being arranged adjacent to the other two surfaces, A head block to which the cutting tool is attached, A first coolant nozzle including at least one discharge port, At least one second coolant nozzle including at least one discharge port, The head block is, A first block surface, a second block surface, and a third block surface, each surface being arranged adjacent to the other two surfaces, A mounting structure in which the cutting tool is mounted in a posture in which the first block surface is visible when viewed from the normal direction of the first chip surface, the second block surface is visible when viewed from the normal direction of the second chip surface, and the third block surface is visible when viewed from the normal direction of the third chip surface. When viewed from one direction, it has a shape in which the first block surface is visible and the second block surface and the third block surface are not visible. 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 or the third block surface of the head block. At least one of the discharge ports of the first coolant nozzle is arranged facing the first chip surface of the cutting chip. Among the normal directions of the first chip surface, when the direction from the first chip surface toward the surface opposite to the first chip surface is defined as downward, at least one of the discharge ports of the second coolant nozzle is below the first chip surface and is arranged facing the second chip surface or the third chip surface of the cutting chip. A cutting tool holder arranged at a position where at least one second coolant nozzle is not visible when viewed from the one direction.

10. It includes a coolant flow path through which coolant flows. The coolant flow path A first flow path through which coolant supplied from the outside flows, A second flow path branching from the first flow path and extending toward the first coolant nozzle, The cutting tool holder according to claim 1, including at least one third flow path branching from the first flow path and extending toward the second coolant nozzle.

11. The cutting tool holder according to claim 10, wherein the coolant flow path is arranged inside the head block.

12. The cutting tool 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.

13. The head block has a coolant groove arranged on at least one of the second block surface and the third block surface and extending from the second coolant nozzle arranged on the block surface toward the cutting chip. The cutting tool holder according to claim 1, wherein at least a part of the discharge port of the second coolant nozzle is located inside the coolant groove.

14. A cutting tool comprising the cutting tool holder according to claim 1 And the cutting chip.

Images