Holder, cutting tool, and processing method

Abstract

To provide a holder, a cutting tool and a machining method capable of smoothly supplying a coolant to a machining part of a workpiece.SOLUTION: The holder 20 for the cutter has a plurality of mounting parts 61A, 61B, and 61C to which a cartridge 60A, 60B, and 60C for holding a cutter insert 22a, 22b, and 22c are mounted, and a coolant flow passage opening at each of the mounting parts,, and, and a coolant flow passage opening at each of the coolant flow passage openings of the plurality of mounting parts,, and. 41c 22a 42c 42a 41b 22b 42b 41a 22c.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a holder, a cutting tool, and a processing method. [Background technology]

[0002] Patent documents 1 and 2 disclose a cutting tool for turning, in which a cartridge that holds a cutting insert is attached to a holder, and in this cutting tool, the cartridges can be simultaneously attached to multiple mounting portions provided on the holder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2005-537143 [Patent Document 2] Special Publication No. 2005-512823 Summary of the Invention [Problem to be solved by the invention]

[0004] However, cutting tools require the supply of coolant to the machining location of a workpiece for cooling and lubrication. Therefore, when machining a workpiece using the cutting tools described in Patent Documents 1 and 2, coolant must be supplied to the machining location of the workpiece from outside.

[0005] Furthermore, even if a flow path for supplying coolant is provided in the holder of the cutting tool, it is difficult to provide a coolant outlet near the cutting insert, making it difficult to properly supply coolant to the machining location of the workpiece using the cutting insert.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a holder, a cutting tool, and a processing method that are capable of smoothly supplying coolant to the processing location of a workpiece. [Means for solving the problem]

[0007] A holder according to one embodiment of the present invention is a holder for a cutting tool, and has a plurality of mounting portions into which cartridges that hold cutting inserts are attached, and a coolant flow path that opens in at least one of the mounting portions.

[0008] The holder of the above structure has a coolant flow path that opens at the mounting portion, so by attaching a cartridge having an internal flow path that opens near the cutting insert to the mounting portion, the coolant flow path is connected to the internal flow path of the cartridge, and coolant can be smoothly supplied via the internal flow path to the machining point of the workpiece by the cutting insert to cool and lubricate it, thereby extending the tool life.

[0009] In addition, since it has multiple mounting sections to which cartridges that hold cutting inserts are attached, by attaching cartridges to each mounting section, multiple types of cutting inserts can be consolidated into one holder, reducing the time required for tool change (non-cutting time) during machining.In addition, even if one of the cartridges is damaged, it is economical because only the damaged cartridge needs to be replaced.

[0010] In a front view, the plurality of mounting portions may be arranged at point-symmetric positions.

[0011] The coolant passage may have at least two coolant passages opening at at least one of the mounting portions.

[0012] Two coolant channels are branched from one inlet channel, The branching positions of the two coolant flow paths in the introduction flow path may be at different positions in the axial direction of the introduction flow path.

[0013] The two coolant flow paths branched from the introduction flow path may be open at adjacent mounting portions.

[0014] Two coolant flow paths may be provided for each of the plurality of mounting portions.

[0015] One of the two coolant passages may be a rake face passage that communicates with an internal passage of the cartridge that opens on the rake face side of the cutting edge of the cutting insert.

[0016] The other of the two coolant passages may be a flank passage that communicates with an internal passage of the cartridge that opens on the flank side of the cutting edge of the cutting insert.

[0017] An adjustment mechanism may be provided that can adjust the amount of coolant flowing through the rake face flow path and the flank face flow path.

[0018] A cutting tool according to one aspect of the present invention comprises: The tool includes the above-mentioned holder and a cartridge that holds the cutting insert and is attached to the mounting portion of the holder, and the cartridge has an internal flow path that opens near the cutting insert and is connected to the coolant flow path when attached to the mounting portion.

[0019] A processing method according to one aspect of the present invention includes: a cartridge for holding a cutting insert; a holder attached to a machine tool, the holder having a plurality of mounting portions to which the cartridges are attached and a coolant flow path that opens in at least one of the mounting portions; A machining method using a cutting tool comprising: a first step of disposing at least two types of cutting inserts in the mounting portion; a second step of machining a rotating workpiece with the first type of cutting insert; a third step of rotating the holder about its central axis by a predetermined angle to position a cutting insert of a type different from the first type at a position where the cutting insert is to be used for machining; a fourth step of machining the workpiece with a cutting insert of a type different from the first type; Equipped with.

[0020] In the first step, different types of cutting inserts may be arranged for the respective mounting portions.

[0021] The cartridge may have an internal flow passage, and a discharge port of the internal flow passage may open toward the cutting edge of the cutting insert. [Effects of the Invention]

[0022] According to the present invention, a holder, a cutting tool, and a processing method are provided that are capable of smoothly supplying coolant to a processing location on a workpiece. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a cutting tool in which a cartridge is attached to a holder according to this embodiment. [Figure 2] FIG. 2 is a perspective view of the holder according to this embodiment. [Figure 3] FIG. 3 is a schematic front view of the holder showing the coolant flow paths provided in the holder. [Figure 4] FIG. 4 is a schematic perspective view of the holder showing the coolant flow paths provided in the holder. [Figure 5] FIG. 5 is a perspective view of a cartridge with a cutting insert attached thereto. [Figure 6] FIG. 6 is a schematic perspective view of the cartridge showing the internal flow path of the cartridge. [Figure 7] FIG. 7 is a perspective view of the same cartridge as in FIG. 5, but with a cutting insert different from that in FIG. 5 attached thereto. [Figure 8] FIG. 8 is a perspective view of a cartridge different from that of FIG. 5, in which a cutting insert different from that of FIGS. 5 and 6 is mounted. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2, a cutting tool 10 according to this embodiment includes a holder 20 and a plurality of cartridges 60A, 60B, and 60C. These cartridges 60A, 60B, and 60C hold cutting inserts 61A, 61B, and 61C, respectively. The cutting tool 10 is, for example, a turning tool for performing cutting on a rotating workpiece (not shown) using the cutting inserts 61A, 61B, and 61C. Note that, while this example illustrates a case in which the holder 20 includes three cartridges 60A, 60B, and 60C, the number of cartridges is not limited to three and may be two, four, or more.

[0025] The holder 20 is the largest component in terms of volume of the cutting tool 10 and is made of, for example, steel. The holder 20 is formed in a substantially cylindrical shape. The holder 20 has a connecting portion 21. The connecting portion 21 is a portion on one side of the holder 20 along the longitudinal direction, and is attached to a machine tool (not shown).

[0026] The holder 20 has a plurality of mounting portions 22a, 22b, and 22c. In this example, the holder 20 has three mounting portions 22a, 22b, and 22c. Cartridges 60A, 60B, and 60C are mounted to these mounting portions 22a, 22b, and 22c, respectively. These mounting portions 22a, 22b, and 22c are arranged at point-symmetric positions about the central axis AX1 when viewed from the front of the holder 20. In this way, since the holder 20 has the mounting portions 22a, 22b, and 22c at point-symmetric positions about the central axis AX1, the cutting inserts 61A, 61B, and 61C of the cartridges 60A, 60B, and 60C mounted to any of the mounting portions 22a, 22b, and 22c can be easily aligned with the workpiece by rotating the holder 20 about the central axis AX1.

[0027] The mounting portions 22a, 22b, and 22c of the holder 20 are shaped to correspond to the cartridges 60A, 60B, and 60C to be mounted. In this example, the same type of cartridges 60A and 60B are mounted in the mounting portions 22a and 22b, and a different type of cartridge 60C is mounted in the mounting portion 22c. Different cutting inserts 61A, 61B, and 61C are mounted in the cartridges 60A, 60B, and 60C, respectively. In this example, the same type of cartridges 60A and 60B are used for the different cutting inserts 61A and 61B. However, different cartridges 60A, 60B, and 60C may be dedicated to the different cutting inserts 61A, 61B, and 61C, respectively. Furthermore, the same type of cartridges 60A, 60B, and 60C may be mounted in these mounting portions 22a, 22b, and 22c.

[0028] The mounting portions 22a, 22b, and 22c each have a mounting surface 31, an abutment wall 32, a positioning protrusion 33, and an escape recess 34. The mounting surface 31 is a plane that is along the central axis AX1 and perpendicular to a normal line passing through the central axis AX1. The abutment wall 32 is formed along one edge of the mounting surface 31. The positioning protrusion 33 is formed on the rear edge of the mounting surface 31. The escape recess 34 is a recess that provides an escape for the cutting inserts 61A and 61B held in the cartridges 60A and 60B when the cartridges 60A and 60B are mounted on the mounting portions 22a and 22b, and is formed on the front edge of the mounting surface 31.

[0029] The mounting portions 22a, 22b, and 22c also have a plurality of screw holes 35a, 35b, 35c, and 35d. The screw holes 35a, 35b, and 35c are formed in the mounting surface 31 of each of the mounting portions 22a, 22b, and 22c. A recess 36 is formed in the other edge of the mounting surface 31 on the side opposite the abutment wall 32, and the screw hole 35d is formed in this recess 36. The screw hole 35d is inclined toward the abutment wall 32 with respect to the mounting surface 31 and toward the central axis AX1.

[0030] The mounting portion 22a has two openings 41aa and 42aa. The mounting portion 22b has two openings 41ba and 42ba. The mounting portion 22c has two openings 41ca and 42ca. These openings 41aa, 42aa, 41ba, 42ba, 41ca, and 42ca are formed in the mounting surfaces 31 of the mounting portions 22a, 22b, and 22c, respectively.

[0031] 3 and 4, the holder 20 has two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c. The coolant flow paths 41a, 41b, and 41c are flow paths for the rake face, and the coolant flow paths 42a, 42b, and 42c are flow paths for the flank face.

[0032] The holder 20 has a supply flow path 45 and three introduction flow paths 46X, 46Y, and 46Z. The supply flow path 45 is formed in the center of the holder 20, and the introduction flow paths 46X, 46Y, and 46Z are connected to the front end of the supply flow path 45 and are in communication with each other. The introduction flow paths 46X, 46Y, and 46Z are gradually inclined in a direction away from the central axis AX1 toward the tip of the holder 20, and each end 46a of these introduction flow paths 46X, 46Y, and 46Z reaches the tip surface 20a of the holder 20. This allows the introduction flow paths 46X, 46Y, and 46Z to be easily formed from the tip surface 20a side of the holder 20 using a drill or other boring tool. In this example, the inlet flow paths 46X, 46Y, and 46Z extend linearly over their entire length, but the linearly extending portion may be at least the tip side of the inlet flow paths 46X, 46Y, and 46Z, more specifically, only the screw portion 47 along which the screw member 48 described later moves.

[0033] The coolant flow paths 41 a and 42 c branch off from the introduction flow path 46 X. The coolant flow paths 41 a and 42 c extend toward the mounting surfaces 31 of the adjacent mounting parts 22 a and 22 c, respectively, with the coolant flow path 41 a forming a right angle with the mounting surface 31 of the mounting part 22 a and the coolant flow path 42 c forming a right angle with the mounting surface 31 of the mounting part 22 c. The coolant flow paths 41b and 42a branch off from the introduction flow path 46Y. The coolant flow paths 41b and 42a extend toward the mounting surfaces 31 of the adjacent mounting parts 22b and 22a, respectively, with the coolant flow path 41b forming a right angle with the mounting surface 31 of the mounting part 22b and the coolant flow path 42a forming a right angle with the mounting surface 31 of the mounting part 22a. The coolant passages 41c and 42b branch off from the introduction passage 46Z. The coolant passages 41c and 42b extend toward the mounting surfaces 31 of the adjacent mounting parts 22c and 22b, respectively, with the coolant passage 41c forming a right angle with the mounting surface 31 of the mounting part 22c, and the coolant passage 42b forming a right angle with the mounting surface 31 of the mounting part 22b.

[0034] Here, if two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c branched from one introduction flow path 46X, 46Y, and 46Z are guided perpendicular to the mounting surface 31 of one mounting portion 22a, 22b, and 22c, a bent portion will be formed on one of the paths. Therefore, when forming one of the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c having a bent portion, it is necessary to form a flow path perpendicular to the mounting surface 31 using a drill or other drilling tool, and then to form a flow path that connects this flow path with the introduction flow paths 46X, 46Y, and 46Z, which makes the drilling process complicated.

[0035] In contrast, in this example, one (a rake face flow path) and the other (a flank face flow path) of the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c branched from each introduction flow path 46X, 46Y, and 46Z are led to the adjacent mounting parts 22a, 22b, and 22c, respectively, so that the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c are led at right angles to the mounting surfaces 31 of the mounting parts 22a, 22b, and 22c, respectively, without providing any bent portions. This allows the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c to be easily formed from the mounting surfaces 31 of the mounting parts 22a, 22b, and 22c using a drill or other drilling tool.

[0036] Branch positions 41Q and 42Q of the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c in the introduction flow paths 46X, 46Y, and 46Z are located at different positions in the axial direction of the introduction flow paths 46X, 46Y, and 46Z. Specifically, branch position 42Q of the coolant flow paths 42a, 42b, and 42c in the introduction flow paths 46X, 46Y, and 46Z is located closer to end portion 46a of the introduction flow paths 46X, 46Y, and 46Z than branch position 41Q of the coolant flow paths 41a, 41b, and 41c in the introduction flow paths 46X, 46Y, and 46Z.

[0037] The introduction flow paths 46X, 46Y, 46Z each have an internal thread portion 47 extending from the branching position 42Q of the coolant flow paths 42a, 42b, 42c to each end 46a, and a screw member 48 is threaded into the internal thread portion 47 from each end 46a of the introduction flow paths 46X, 46Y, 46Z. A hollow set screw, for example, is used as the screw member 48. The end 46a of each of the introduction flow paths 46X, 46Y, 46Z is closed by the screw member 48.

[0038] In the holder 20, coolant is sent to the supply flow path 45. The coolant sent to this supply flow path 45 is branched into the inlet flow paths 46X, 46Y, and 46Z, and further branched from these inlet flow paths 46X, 46Y, and 46Z to the respective coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c. As a result, the coolant is supplied to the respective mounting portions 22a, 22b, and 22c through the respective coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c, and can be sent to the cartridges 60A, 60B, and 60C attached to the respective mounting portions 22a, 22b, and 22c. Note that the fluid supplied to the cutting area is not limited to coolant; various lubricants and coolants can also be used, and mist or air can also be supplied.

[0039] Furthermore, the supply flow path 45 has a larger flow path cross-section than the introduction flow paths 46X, 46Y, and 46Z, which in turn have larger flow path cross-sections than the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c. That is, the supply flow path 45, the introduction flow paths 46X, 46Y, and 46Z, and the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c are arranged in order of the coolant flow, and the flow path cross-sections become smaller in that order. Therefore, when the coolant flows from the supply flow path 45 to the introduction flow paths 46X, 46Y, and 46Z and the coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c, the coolant can be delivered to the cartridges 60A, 60B, and 60C attached to the attachment portions 22a, 22b, and 22c while suppressing pressure loss of the coolant.

[0040] In the holder 20, the screw members 48, which are threaded into the female thread portions 47 of the introduction channels 46X, 46Y, and 46Z and close the ends 46a, are advanced and retreated by being rotated with a tool. The screw members 48 function as valves that adjust the cross-sectional area of ​​the coolant channels 42a, 42b, and 42c, which are relief channels, at the branching position 42Q by advancing and retreating through the female thread portions 47. Specifically, after the screw members 48, threaded into the female thread portions 47, reach the branching position 42Q of the coolant channels 42a, 42b, and 42c, the cross-sectional area of ​​the coolant channels 42a, 42b, and 42c at the branching position 42Q is gradually reduced by the screw members 48, until the coolant channels 42a, 42b, and 42c are finally fully closed. Furthermore, when the screw member 48 is loosened from a state in which the coolant flow paths 42a, 42b, and 42c are closed by the screw member 48, the flow path cross-sectional area at the branch position 42Q of the coolant flow paths 42a, 42b, and 42c gradually increases and is finally fully opened. In this way, in the holder 20, by advancing and retracting the screw member 48 as needed, the flow path cross-sectional area at the branch position 42Q of the coolant flow paths 42a, 42b, and 42c, which are relief flow paths, can be increased or decreased, or the coolant flow paths 42a, 42b, and 42c can be opened or closed. In other words, by advancing and retracting the screw member 48, the amount of coolant flowing not only through the coolant flow paths 42a, 42b, and 42c but also through the coolant flow paths 41a, 41b, and 41c, can be adjusted.

[0041] In this example, the introduction passages 46X, 46Y, and 46Z have internal threads 47 extending from the branching positions 42Q of the coolant passages 42a, 42b, and 42c to the respective ends 46a, but a modification is also possible in which the internal threads 47 are extended to the branching positions 41Q of the coolant passages 41a, 41b, and 41c serving as rake face passages, and the cross-sectional area of ​​the coolant passages 41a, 41b, and 41c at the branching positions 41Q is increased or decreased by moving the screw member 48. However, in this modification, in order to increase or decrease the cross-sectional area of ​​the coolant passages 41a, 41b, and 41c serving as rake face passages at the branching positions 41Q, the coolant passages 42a, 42b, and 42c serving as flank face passages must be fully closed in a previous step, which may undermine the advantage of providing two types of coolant passages 41a, 41b, 41c, 42a, 42b, and 42c. For this reason, this example is preferable to the modified example.

[0042] In addition, in this embodiment, the branching position 42Q of the coolant passages 42a, 42b, and 42c in the introduction passages 46X, 46Y, and 46Z is closer to the end 46a of the introduction passages 46X, 46Y, and 46Z than the branching position 41Q of the coolant passages 41a, 41b, and 41c in the introduction passages 46X, 46Y, and 46Z. However, a modification in which the positional relationship between the branching position 42Q and the branching position 41Q is reversed is also possible. In this modification, by advancing and retracting the screw member 48, the coolant flow rate in the coolant passages 41a, 41b, and 41c serving as the rake face passages is reduced and the coolant flow rate in the coolant passages 42a, 42b, and 42c serving as the flank face passages is increased. However, because it is generally desirable to enhance the cooling effect on the rake face side compared to the flank side, this embodiment is preferable to this modification.

[0043] As shown in Fig. 5, the cartridge 60A is formed in a plate shape. The cartridge 60A has an insert pocket 72 on the front side, and a cutting insert 61A is attached to the insert pocket 72. The cartridge 60A also has a positioning recess 73 on the rear end side. When the cartridge 60A is placed in the mounting portion 22a of the holder 20, its lower edge abuts against the abutment wall 32 of the mounting portion 22a, and the positioning protrusion 33 of the mounting portion 22a engages with the positioning recess 73. As a result, the cartridge 60A is placed in the mounting portion 22a in a positioned state.

[0044] This cartridge 60A has a plurality of fastening holes 75a, 75b, 75c, and 75d which are counterbore holes. The fastening holes 75a, 75b, and 75c are formed so as to penetrate the cartridge 60A from the front to the back, and are formed at positions corresponding to the screw holes 35a, 35b, and 35c formed in the mounting portions 22a, 22b, and 22c of the holder 20. The fastening hole 75d is formed at a position corresponding to the screw hole 35d formed in the recess 36 of the other edge of the mounting surface 31 on the side opposite the abutment wall 32.

[0045] The cartridge 60A is placed in the mounting portion 22a of the holder 20, and is fixed to the mounting portion 22a by inserting screws 76a, 76b, 76c, and 76d into the fastening holes 75a, 75b, 75c, and 75d and screwing them into the screw holes 35a, 35b, 35c, and 35d (see FIG. 1). Furthermore, by inserting the screw 76d into the fastening hole 75d and screwing it into the screw hole 35d, the upper piece portion 72a of the insert pocket 72 is pressed against the cutting insert 61A. This firmly fixes the cutting insert 61A to the insert pocket 72.

[0046] The cutting insert 61A held in the insert pocket 72 of the cartridge 60A is used, for example, when performing copy machining or undercutting on a workpiece. The cutting insert 61A has a round cutting edge 62A having a rake face 62Aa and a clearance face 62Ab on both ends thereof, and is held in the insert pocket 72 so that one of the cutting edges 62A is positioned on the tip side of the cartridge 60A.

[0047] 6, the cartridge 60A has internal flow paths 91 and 92. The internal flow paths 91 and 92 have openings 91a and 92a on the surfaces of the mounting portion 22a of the cartridge 60A that abut against the mounting surface 31. These openings 91a and 92a are disposed at positions corresponding to the openings 41aa and 42aa of the coolant flow paths 41a and 42a formed on the mounting surface 31. Thus, by mounting the cartridge 60A to the mounting portion 22a of the holder 20, the coolant flow paths 41a and 42a of the holder 20 are connected to the internal flow paths 91 and 92 of the cartridge 60A.

[0048] The internal flow paths 91 and 92 have discharge ports 91b and 92b that pass through the interior of the cartridge 60A and open at the tip of the cartridge 60A. The discharge port 91b of the internal flow path 91 opens toward the cutting edge 62A on the rake face 62Aa side of the cutting portion of the workpiece that is machined by the cutting edge 62A of the cutting insert 61A. The discharge port 92b of the internal flow path 92 opens on the flank face 62Ab side of the cutting portion of the workpiece that is machined by the cutting edge 62A of the cutting insert 61A.

[0049] 7, the cartridge 60B has the same configuration and shape as the cartridge 60A, and holds a cutting insert 61B. Since the cartridge 60B has the same configuration and shape as the cartridge 60A, the other components are denoted by the same reference numerals as the cartridge 60A and description thereof will be omitted.

[0050] The cutting insert 61B held in the insert pocket 72 of the cartridge 60B is used, for example, when performing grooving or parting on a workpiece. The cutting insert 61B has an angular cutting edge 62B having a rake face 62Ba and a flank face 62Bb on both ends thereof, and is held in the insert pocket 72 so that one of the cutting edges 62B is located on the tip side of the cartridge 60B.

[0051] This cartridge 60B also has an internal flow passage 91 that opens on the rake face 62Ba side of the cutting insert 61B and an internal flow passage 92 that opens on the flank face 62Bb side of the cutting insert 61B. In the case of this cartridge 60B, by attaching it to the attachment portion 22b of the holder 20, the coolant flow passages 41b, 42b of the holder 20 are connected to the internal flow passages 91, 92 of the cartridge 60B.

[0052] As shown in FIG. 8, the cartridge 60C is formed in a plate shape. The cartridge 60C has a recessed insert pocket 82 on the front side, and a cutting insert 61C is attached to the insert pocket 82. The cartridge 60C also has a positioning recess 83 on the rear end side. When the cartridge 60C is placed in the mounting portion 22c of the holder 20, its lower edge abuts against the abutment wall 32 of the mounting portion 22c, and the positioning protrusion 33 of the mounting portion 22c engages with the positioning recess 83. As a result, the cartridge 60C is placed in the mounting portion 22c in a positioned state.

[0053] This cartridge 60C has a plurality of fastening holes 85a, 85b, 85c, and 85d which are counterbore holes. The fastening holes 85a, 85b, and 85c are formed so as to penetrate the cartridge 60C from the front to the back, and are formed at positions corresponding to the screw holes 35a, 35b, and 35c formed in the mounting portion 22c of the holder 20. The fastening hole 85d is formed at a position corresponding to the screw hole 35d formed in the recess 36 of the other edge of the mounting surface 31 on the side opposite the abutment wall 32.

[0054] The cartridge 60C is placed in the mounting portion 22c of the holder 20, and is fixed to the mounting portion 22c by inserting the screws 76a, 76b, 76c, and 76d into the fastening holes 85a, 85b, 85c, and 85d and screwing them into the screw holes 35a, 35b, 35c, and 35d.

[0055] The cutting insert 61C held in the insert pocket 82 of the cartridge 60C is used, for example, when performing profiling, undercutting, grooving, parting, or threading on a workpiece. The cutting insert 61C has four cutting edges 62C, each having a rake face 62Ca and a flank face 62Cb, around its periphery. These cutting edges 62C are provided at equal intervals in the circumferential direction, and the cutting insert 61C is held in the insert pocket 82 so that one of the cutting edges 62C is located at the tip end side of the cartridge 60C. The cutting insert 61C is fitted into the insert pocket 82, and its center is fixed to the cartridge 60C by a fastening screw 87. Note that the cutting insert 61C has cutting edges 62C of different shapes depending on the type of machining to be performed on the workpiece.

[0056] Unlike cartridges 60A and 60B, cartridge 60C has only an internal flow passage (hereinafter, for convenience of explanation, referred to as internal flow passage 91) that opens toward cutting edge 62C as discharge port 91b on the rake face 62Ca side of cutting insert 61C. Therefore, when cartridge 60C is attached to mounting portion 22c of holder 20, one coolant flow passage 41c of holder 20 is connected to internal flow passage 91 of cartridge 60C, and opening 42ca of coolant flow passage 42c is closed by cartridge 60C. Note that although opening 42ca can be closed with, for example, a screw, in this example, opening 42c is closed on one side of cartridge 60C (the surface facing abutment surface 31 of mounting portion 22c), so opening 42c can remain open, thereby suppressing an increase in the number of parts.

[0057] As described above, in the cutting tool 10 of this embodiment, the holder 20 includes a plurality of mounting portions 22a, 22b, 22c to which the cartridges 60A, 60B, 60C that hold the cutting inserts 61A, 61B, 61C are mounted. In other words, it is possible to arrange different types of cutting inserts 61A, 61B, 61C in each mounting portion 22a, 22b, 22c (first step), and after machining the workpiece with one of the cutting inserts 61A, 61B, 61C (first type of cutting insert) (second step), the holder 20 is rotated 120 degrees around its central axis to position one of the remaining two cutting inserts (a cutting insert of a type different from the first type) at a position for machining (third step), and after machining the workpiece with that cutting insert (fourth step), the holder 20 is further rotated 120 degrees around its central axis to position the remaining cutting insert at a position for machining, and the workpiece can be machined.

[0058] Therefore, various types of machining can be performed on a workpiece using cutting inserts 61A, 61B, and 61C held in cartridges 60A, 60B, and 60C attached to multiple attachment portions 22a, 22b, and 22c of holder 20. In other words, multiple types of cutting inserts 61A, 61B, and 61C can be integrated into one holder 20, reducing the time required for tool replacement (non-cutting time) during machining. Furthermore, even if any of cartridges 60A, 60B, and 60C is damaged, only the damaged cartridge needs to be replaced, resulting in excellent economy.

[0059] Furthermore, the holder 20 according to this embodiment has two types of coolant flow paths 41a, 41b, 42a, and 42b that open in the mounting portions 22a, 22b, and 22c. Thus, by mounting the cartridges 60A and 60B in the mounting portions 22a and 22b, the coolant flow paths 41a and 42a communicate with the internal flow paths 91 and 92 of the cartridges 60A and 60B, respectively. Also, by mounting the cartridge 60C in the mounting portion 22c, the coolant flow path 41c communicates with the internal flow path 91 of the cartridge 60C.

[0060] Therefore, in the cartridge 60A attached to the attachment portion 22a, coolant can be supplied from the coolant flow paths 41a, 42a of the holder 20 to the internal flow paths 91, 92, and the coolant can be discharged from the discharge ports 91b, 92b that open on the rake face 62Aa side and the flank face 62Ab side of the machining location on the workpiece by the cutting edge 62A. This allows the coolant to be smoothly supplied to the machining location on the workpiece by the cutting edge 62A of the cutting insert 61A, thereby cooling and lubricating the workpiece.

[0061] Similarly, in the cartridge 60B attached to the attachment portion 22b, coolant can be supplied from the coolant flow paths 41b, 42b of the holder 20 to the internal flow paths 91, 92, and the coolant can be discharged from the discharge ports 91b, 92b that open on the rake face 62Ba side and the flank face 62Bb side of the machining location on the workpiece by the cutting edge 62B. This allows the coolant to be smoothly supplied to the machining location on the workpiece by the cutting edge 62B of the cutting insert 61B, thereby cooling and lubricating the workpiece.

[0062] Furthermore, in the cartridge 60C attached to the attachment portion 22c, coolant can be supplied from the coolant flow path 41c of the holder 20 to the internal flow path 91, and the coolant can be discharged from the discharge port 91b that opens on the rake face 62Ca side of the machining location on the workpiece by the cutting edge 62C. This allows the coolant to be smoothly supplied to the machining location on the workpiece by the cutting edge 62C of the cutting insert 61C, thereby cooling and lubricating the workpiece.

[0063] As described above, according to this embodiment, coolant can be smoothly supplied to the machining location of the workpiece, and the tool life can be extended.

[0064] Moreover, in the holder 20, the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c branch off from a single introduction flow path 46X, 46Y, and 46Z, and branch positions 41Q and 42Q of the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c in the introduction flow path 46X, 46Y, and 46Z are located at different axial positions of the introduction flow path 46X, 46Y, and 46Z. By thus positioning the branch positions 41Q and 42bQ of the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c in the introduction flow path 46X, 46Y, and 46Z at different axial positions of the introduction flow path 46X, 46Y, and 46Z, the diameters of the introduction flow paths 46X, 46Y, and 46Z can be reduced, and the holder 20 can be prevented from becoming larger.

[0065] Furthermore, in the holder 20, the cross-sectional area of ​​the coolant flow paths 42a, 42b, and 42c, which are relief flow paths, at the branch position 42Q can be adjusted by advancing and retracting the screw members 48 provided at the ends 46a of the introduction flow paths 46X, 46Y, and 46Z. Therefore, by advancing and retracting the screw members 48 as needed, the cross-sectional area of ​​the coolant flow paths 42a, 42b, and 42c, which are relief flow paths, at the branch position 42Q can be increased or decreased, or the coolant flow paths 42a, 42b, and 42c can be opened or closed.

[0066] For example, by moving the screw member 48 in the inlet flow passage 46Y to close the coolant flow passage 42a, coolant can be supplied only to the rake face 62Aa side of the cutting portion of the workpiece by the cutting insert 61A to cool and lubricate it. Also, by moving the screw member 48 in the inlet flow passage 46Z to close the coolant flow passage 42b, coolant can be supplied only to the rake face 62Ba side of the cutting portion of the workpiece by the cutting insert 61B to cool and lubricate it. Also, by moving the screw member 48 in the inlet flow passage 46X to close the coolant flow passage 42c, coolant can be supplied only to the rake face 62Ca side of the cutting portion of the workpiece by the cutting insert 61C to cool and lubricate it.

[0067] As described above, according to this embodiment, increasing the amount of coolant supplied to the cutting faces 62Aa, 62Ba, and 62Ca is effective for cutting titanium alloys, which experience relatively large wear on the cutting faces 62Aa, 62Ba, and 62Ca, and also contributes to the breakup of chips.

[0068] The present disclosure is not limited to the above specific examples, and designs that are appropriately modified by a person skilled in the art from these specific examples are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of the above specific examples, as well as their arrangement, conditions, shape, etc., are not limited to those exemplified and can be modified as appropriate. The elements of the above specific examples can be combined as appropriate as long as no technical contradictions arise. [Explanation of symbols]

[0069] 10 cutting tools 20 Holder 22a, 22b, 22c attachment parts 41a, 41b, 41c, 42a, 42b, 42c Coolant flow passage 41Q, 42Q branch position 46X, 46Y, 46Z Inlet channel 47 Female thread (adjustment mechanism) 48 Screw member (adjustment mechanism) 60A, 60B, 60C Cartridges 61A, 61B, 61C Cutting Inserts 62A, 62B, 62C cutting edge 62Aa, 62Ba, 62Ca rake face 62Ab, 62Bb, 62Cb Flank 91,92 Internal flow path

Claims

1. A holder for a cutting tool, comprising: a plurality of mounting portions to which cartridges for holding cutting inserts are mounted; a coolant passage opening at at least one of the mounting portions; having Retainer.

2. When viewed from the front, the plurality of mounting portions are arranged at point-symmetric positions. The holder of claim 1 .

3. At least two of the coolant flow passages are open at at least one of the mounting portions. The holder of claim 1 .

4. The two coolant flow paths are branched from one introduction flow path, The branching positions of the two coolant passages in the introduction passage are at different positions in the axial direction of the introduction passage. The holder of claim 1 .

5. The two coolant flow paths branched from the introduction flow path are open at the mounting portions adjacent to each other. The holder according to claim 4.

6. Two coolant flow paths are provided for each of the plurality of mounting portions. The holder of claim 1 .

7. One of the two coolant flow paths is a rake face flow path that is in communication with an internal flow path of the cartridge that opens on a rake face side of the cutting edge of the cutting insert. The holder according to claim 6.

8. the other of the two coolant flow paths is a flank flow path that is in communication with an internal flow path of the cartridge that opens on a flank side of the cutting edge of the cutting insert; The holder according to claim 7.

9. an adjusting mechanism capable of adjusting the amount of coolant flowing through the rake face flow path and the flank face flow path; The holder of claim 8.

10. The holder according to any one of claims 1 to 9, a cartridge that holds a cutting insert and is attached to the attachment portion of the holder; Equipped with the cartridge has an internal flow passage that opens near the cutting insert and communicates with the coolant flow passage when the cartridge is attached to the attachment portion; cutting tools.

11. a cartridge for holding a cutting insert; a holder attached to a machine tool, the holder having a plurality of mounting portions to which the cartridges are attached and a coolant flow path opening in at least one of the mounting portions; A machining method using a cutting tool comprising: a first step of disposing at least two types of cutting inserts in the mounting portion; a second step of machining a rotating workpiece with the first type of cutting insert; a third step of rotating the holder about its central axis by a predetermined angle to position a cutting insert of a type different from the first type at a position where the cutting insert is to be used for machining; a fourth step of machining the workpiece with a cutting insert of a type different from the first type; A processing method comprising:

12. The first step includes arranging different types of cutting inserts for the respective mounting portions. The processing method according to claim 11.

13. The cartridge has an internal flow path, and a discharge port of the internal flow path opens toward the cutting edge of the cutting insert. The processing method according to claim 11.

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