Holder, cutting tool and processing method

Abstract

A holder, cutting tool, and processing method capable of smoothly supplying coolant to a processing location of a workpiece are provided. [Solution] A holder 20 for a cutting tool has a plurality of mounting portions 22a, 22b, 22c to which cartridges 60A, 60B, 60C that hold cutting inserts 61A, 61B, 61C are attached, and coolant flow paths 41a, 41b, 41c, 42a, 42b, 42c that open at each mounting portion 22a, 22b, 22c.

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 as a turning tool 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] Incidentally, in cutting tools, it is necessary to supply coolant to the machining location of a workpiece for cooling and lubrication. Therefore, when machining a workpiece with the cutting tools described in Patent Documents 1 and 2, it is necessary to supply coolant from outside to the machining location of the workpiece.

[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 has an object to provide a holder, a cutting tool, and a processing method that are capable of smoothly supplying coolant to a 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 passage that opens in at least one of the mounting portions.

[0008] A holder with the above structure has a coolant flow passage that opens at the mounting portion. By mounting a cartridge having an internal flow passage that opens near the cutting insert to the mounting portion, the coolant flow passage is connected to the internal flow passage of the cartridge, and coolant can be smoothly supplied via the internal flow passage to the machining point of the workpiece by the cutting insert for cooling and lubrication, thereby extending the tool life.

[0009] In addition, since it has multiple mounting parts on which cartridges that hold cutting inserts are attached, multiple types of cutting inserts can be consolidated into one holder by attaching cartridges to each mounting part, which reduces the time required for tool change (non-cutting time) during processing. Also, 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 multiple mounting parts may be arranged in point symmetry.

[0011] There may be at least two coolant passages opening at at least one mounting portion.

[0012] Two coolant channels are branched off from one inlet channel. The branching positions of the introduction flow passage into the two coolant flow passages may be different positions in the axial direction of the introduction flow passage.

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

[0014] Two coolant passages may be provided for each of the 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 passage and the flank face flow passage.

[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, the cartridge having an internal flow passage that opens near the cutting insert and is connected to the coolant flow passage when attached to the mounting portion.

[0019] A processing method according to one aspect of the present invention includes the steps of: a cartridge for holding a cutting insert; a holder that is attached to a machine tool and has a plurality of mounting portions to which the cartridges are attached and a coolant flow passage that opens at at least one of the mounting portions; A processing 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 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 disposed for each of the mounting portions.

[0021] The cartridge may have an internal flow passage, and a discharge port of the internal flow passage may open toward a cutting edge of the cutting insert. Effect 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 of a workpiece. [Brief description 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 the present embodiment. [Diagram 2] FIG. 2 is a perspective view of the holder according to the present embodiment. [Diagram 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. [Diagram 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 paths 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. [Figure 8] FIG. 8 is a perspective view of a cartridge different from that in FIG. 5, in which a cutting insert different from that in FIGS. 5 and 6 is attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in Fig. 1 and Fig. 2, the cutting tool 10 according to the present 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, in this example, the holder 20 includes three cartridges 60A, 60B, and 60C, but the number of cartridges is not limited to three, and may be two, four, or more.

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

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

[0027] The mounting parts 22a, 22b, and 22c of the holder 20 are shaped according to the cartridges 60A, 60B, and 60C to be mounted. In this example, the same type of cartridges 60A and 60B are mounted on the mounting parts 22a and 22b, and a cartridge 60C of a different type from the cartridges 60A and 60B is mounted on the mounting part 22c. Different cutting inserts 61A, 61B, and 61C are mounted on 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, but different cartridges 60A, 60B, and 60C may be dedicated to different cutting inserts 61A, 61B, and 61C, respectively. The same type of cartridges 60A, 60B, and 60C may be mounted on these mounting parts 22a, 22b, and 22c.

[0028] The mounting parts 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 serves as an escape for the cutting inserts 61A and 61B held by the cartridges 60A and 60B when the cartridges 60A and 60B are mounted on the mounting parts 22a and 22b, and is formed on the front edge of the mounting surface 31.

[0029] Further, the mounting parts 22a, 22b, 22c have a plurality of screw holes 35a, 35b, 35c, 35d. The screw holes 35a, 35b, 35c are formed in the mounting surface 31 of each of the mounting parts 22a, 22b, 22c. A recess 36 is formed in the other edge of the mounting surface 31 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 side toward the central axis AX1 with respect to the mounting surface 31.

[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 passages 41a, 41b, 41c, 42a, 42b, and 42c. The coolant passages 41a, 41b, and 41c are passages for the rake face, and the other coolant passages 42a, 42b, and 42c are passages for the flank face.

[0032] The holder 20 has a supply flow passage 45 and three introduction flow passages 46X, 46Y, 46Z. The supply flow passage 45 is formed in the center of the holder 20, and the introduction flow passages 46X, 46Y, 46Z are connected to the front end of the supply flow passage 45 and communicate with each other. The introduction flow passages 46X, 46Y, 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 passages 46X, 46Y, 46Z reaches the tip surface 20a of the holder 20. As a result, the introduction flow passages 46X, 46Y, 46Z can be easily formed from the tip surface 20a side of the holder 20 by a drilling tool such as a drill. 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 passages 41a and 42c are branched off from the introduction passage 46X. The coolant passages 41a and 42c extend toward the mounting surfaces 31 of the adjacent mounting parts 22a and 22c, respectively, with the coolant passage 41a forming a right angle with respect to the mounting surface 31 of the mounting part 22a, and the coolant passage 42c forming a right angle with respect to the mounting surface 31 of the mounting part 22c. The coolant passages 41b and 42a are branched off from the introduction passage 46Y. The coolant passages 41b and 42a extend toward the mounting surfaces 31 of the adjacent mounting parts 22b and 22a, respectively, with the coolant passage 41b forming a right angle with respect to the mounting surface 31 of the mounting part 22b and the coolant passage 42a forming a right angle with respect to the mounting surface 31 of the mounting part 22a. The coolant passages 41c and 42b are branched 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 perpendicular to the mounting surface 31 of the mounting part 22c and the coolant passage 42b perpendicular to the mounting surface 31 of the mounting part 22b.

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

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

[0036] The branch positions 41Q, 42Q of the coolant passages 41a, 41b, 41c, 42a, 42b, 42c in the introduction passages 46X, 46Y, 46Z are different from each other in the axial direction of the introduction passages 46X, 46Y, 46Z. Specifically, the branch position 42Q of the coolant passages 42a, 42b, 42c in the introduction passages 46X, 46Y, 46Z is closer to the end 46a of the introduction passages 46X, 46Y, 46Z than the branch position 41Q of the coolant passages 41a, 41b, 41c in the introduction passages 46X, 46Y, 46Z.

[0037] Further, the introduction flow passages 46X, 46Y, 46Z have female threads 47 between the branching positions 42Q of the coolant flow passages 42a, 42b, 42c and the respective ends 46a, and screw members 48 are screwed into the female threads 47 from the respective ends 46a of the introduction flow passages 46X, 46Y, 46Z. For example, a porcelain enamel set is used as the screw member 48. The screw members 48 close the respective ends 46a of the introduction flow passages 46X, 46Y, 46Z.

[0038] In the holder 20, the coolant is sent to the supply flow path 45. The coolant sent to the supply flow path 45 is diverted to the introduction flow paths 46X, 46Y, and 46Z, and further diverted from these introduction flow paths 46X, 46Y, and 46Z to the respective coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c. This allows the coolant to be supplied to the respective mounting parts 22a, 22b, and 22c through the respective coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c, and the coolant can be sent to the cartridges 60A, 60B, and 60C mounted on the respective mounting parts 22a, 22b, and 22c. The fluid supplied to the cutting part is not limited to the coolant, and various lubricants and coolants can be used, and mist or air may also be supplied.

[0039] Further, the supply flow passage 45 has a larger flow passage cross section than the introduction flow passages 46X, 46Y, 46Z, and the introduction flow passages 46X, 46Y, 46Z have a larger flow passage cross section than the coolant flow passages 41a, 41b, 41c, 42a, 42b, 42c. That is, the supply flow passage 45, the introduction flow passages 46X, 46Y, 46Z, and the coolant flow passages 41a, 41b, 41c, 42a, 42b, 42c arranged in the order of the flow of the coolant have smaller flow passage cross sections in the order of arrangement. Therefore, when the coolant flows from the supply flow passage 45 to the introduction flow passages 46X, 46Y, 46Z and the coolant flow passages 41a, 41b, 41c, 42a, 42b, 42c, the coolant can be sent to the cartridges 60A, 60B, 60C attached to the attachment parts 22a, 22b, 22c while suppressing the pressure loss of the coolant.

[0040] In the holder 20, the screw member 48, which is screwed into the female thread portion 47 of each of the introduction passages 46X, 46Y, and 46Z and closes the end portion 46a, is advanced and retreated by rotating it with a tool. The screw member 48 advances and retreats through the female thread portion 47 to function as a valve that adjusts the flow passage cross-sectional area at the branch position 42Q of the coolant passages 42a, 42b, and 42c, which are the clearance passages. Specifically, after the screw member 48 screwed into the female thread portion 47 reaches the branch position 42Q of the coolant passages 42a, 42b, and 42c, the flow passage cross-sectional area at the branch position 42Q of the coolant passages 42a, 42b, and 42c is gradually reduced by the screw member 48, and finally, the coolant passages 42a, 42b, and 42c are fully closed. Also, when the screw member 48 is loosened from a state in which the coolant passages 42a, 42b, 42c are closed by the screw member 48, the flow passage cross-sectional area at the branch position 42Q of the coolant passages 42a, 42b, 42c gradually increases, and finally becomes fully open. In this way, in the holder 20, the flow passage cross-sectional area at the branch position 42Q of the coolant passages 42a, 42b, 42c, which are flank passages, can be increased or decreased, or the coolant passages 42a, 42b, 42c can be opened or closed, by advancing and retracting the screw member 48 as necessary. In other words, the flow rate of the coolant in not only the coolant passages 42a, 42b, 42c but also the coolant passages 41a, 41b, 41c can be adjusted by advancing and retracting the screw member 48.

[0041] In the present embodiment, the introduction flow passages 46X, 46Y, and 46Z have female threads 47 between the branch positions 42Q of the coolant flow passages 42a, 42b, and 42c and the ends 46a, but a modification is also possible in which the female threads 47 are extended to the branch positions 41Q of the coolant flow passages 41a, 41b, and 41c that are the flow passages for the rake face, and the flow passage cross-sectional area at the branch positions 41Q of the coolant flow passages 41a, 41b, and 41c is increased or decreased by moving the screw member 48 forward or backward. However, in this modification, in order to increase or decrease the flow passage cross-sectional area at the branch positions 41Q of the coolant flow passages 41a, 41b, and 41c that are the flow passages for the rake face, the coolant flow passages 42a, 42b, and 42c that are the flow passages for the flank face are fully closed in a previous step, so that the advantage of providing two types of coolant flow passages 41a, 41b, 41c, 42a, 42b, and 42c may be lost. For this reason, this example is preferable to the modified example.

[0042] In addition, the branch position 42Q of the coolant passages 42a, 42b, 42c in the introduction passages 46X, 46Y, 46Z in this example is closer to the end 46a of the introduction passages 46X, 46Y, 46Z than the branch position 41Q of the coolant passages 41a, 41b, 41c in the introduction passages 46X, 46Y, 46Z, but a modified example in which the positional relationship between the branch position 42Q and the branch position 41Q is reversed is also possible. In this modified example, the coolant flow rate of the coolant passages 41a, 41b, 41c that are the rake face passages is reduced and the coolant flow rate of the coolant passages 42a, 42b, 42c that are the flank face passages is increased by moving the screw member 48 forward and backward. However, since it is generally desired to increase the cooling effect on the rake face side more than on the flank face side, this example is preferable to this modified example.

[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 end side, and the 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, the lower edge of the cartridge 60A 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 counterbored 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 parts 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 part of the mounting surface 31 on the opposite side to the abutment wall 32.

[0045] The cartridge 60A is fixed to the mounting portion 22a by inserting the 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 in a state in which the cartridge 60A is placed in the mounting portion 22a of the holder 20 (see FIG. 1). In addition, the screw 76d is inserted into the fastening hole 75d and screwed into the screw hole 35d, so that the upper piece portion 72a of the insert pocket 72 is pressed against the cutting insert 61A. As a result, the cutting insert 61A is firmly fixed 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 undercut machining 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, and is held in the insert pocket 72 so that one of the cutting edges 62A is located at the tip side of the cartridge 60A.

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

[0048] The internal flow passages 91 and 92 have discharge ports 91b and 92b that pass through the inside of the cartridge 60A and open at the tip of the cartridge 60A. The discharge port 91b of the internal flow passage 91 opens toward the cutting edge 62A on the rake face 62Aa side of the cutting portion of the workpiece to be machined by the cutting edge 62A of the cutting insert 61A. The discharge port 92b of the internal flow passage 92 opens on the flank face 62Ab side of the cutting portion of the workpiece to be 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 a cutting insert 61B is held in the cartridge 60B. 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 the 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 cut-off on a workpiece. The cutting insert 61B has an angular cutting edge 62B having a rake face 62Ba and a clearance face 62Bb on both ends, 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. Also in the case of this cartridge 60B, by mounting it on the mounting portion 22b of the holder 20, the coolant flow passages 41b, 42b of the holder 20 are communicated with 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 concave insert pocket 82 on the front end side, and the 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, the lower edge of the cartridge 60C 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, 85d which are counterbored holes. The fastening holes 85a, 85b, 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, 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 portion of the mounting surface 31 on the opposite side to 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 copy machining, undercut machining, grooving, parting off, or thread cutting on a workpiece. The cutting insert 61C has four cutting edges 62C having a rake face 62Ca and a clearance 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 any one of the cutting edges 62C is disposed on the tip 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. The cutting insert 61C has cutting edges 62C of different shapes depending on the type of machining on the workpiece.

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

[0057] Thus, in the cutting tool 10 of this embodiment, the holder 20 includes a plurality of mounting portions 22a, 22b, and 22c to which the cartridges 60A, 60B, and 60C that hold the cutting inserts 61A, 61B, and 61C are attached. 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 the workpiece is processed 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 processing (third step), and after the workpiece is processed 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 processing the workpiece.

[0058] Therefore, various types of machining can be performed on the workpiece by the cutting inserts 61A, 61B, and 61C held in the cartridges 60A, 60B, and 60C mounted on the mounting portions 22a, 22b, and 22c of the holder 20. In other words, multiple types of cutting inserts 61A, 61B, and 61C can be integrated into one holder 20, and the tool replacement time (non-cutting time) during machining can be reduced. In addition, even if any of the cartridges 60A, 60B, and 60C is damaged, only the damaged cartridge needs to be replaced, which is economical.

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

[0060] Therefore, in the cartridge 60A mounted on the mounting portion 22a, the 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 to cool and lubricate it.

[0061] Similarly, in the cartridge 60B mounted on the mounting 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 to cool and lubricate it.

[0062] Furthermore, in the cartridge 60C mounted on the mounting portion 22c, the 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 to cool and lubricate it.

[0063] In this manner, 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 are branched from one introduction flow path 46X, 46Y, and 46Z, and the branch positions 41Q and 42Q in the introduction flow paths 46X, 46Y, and 46Z of the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c are set to different positions in the axial direction of the introduction flow paths 46X, 46Y, and 46Z. In this way, by setting the branch positions 41Q and 42bQ in the introduction flow paths 46X, 46Y, and 46Z of the two types of coolant flow paths 41a, 41b, 41c, 42a, 42b, and 42c to different positions in the axial direction of the introduction flow paths 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 large.

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

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

[0067] As described above, according to this embodiment, by increasing the amount of coolant supplied to the cutting faces 62Aa, 62Ba, and 62Ca, it is effective in cutting titanium alloys, where wear on the cutting faces 62Aa, 62Ba, and 62Ca is relatively large, and can also contribute to breaking down chips.

[0068] In addition, the present disclosure is not limited to the above specific examples, and those in which a person skilled in the art appropriately modifies the specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above specific examples and their arrangements, conditions, shapes, etc. are not limited to those exemplified and can be appropriately changed. The combinations of the elements of each of the above specific examples can be appropriately changed as long as no technical contradictions arise. [Explanation of symbols]

[0069] 10 cutting tools 20 Holder 22a, 22b, 22c Mounting parts 41a, 41b, 41c, 42a, 42b, 42c Coolant passage 41Q, 42Q Branch position 46X, 46Y, 46Z Inlet flow path 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 passage

Claims

1. A holder for a cutting tool, comprising: A plurality of mounting portions to which cartridges having internal flow paths and holding cutting inserts are mounted; a coolant passage that opens to a surface of at least one of the mounting portions against which the cartridge abuts, and that communicates with the internal passage when the cartridge is mounted in the mounting portion; having Retainer.

2. When viewed from the front, the multiple mounting parts are arranged in point symmetry. The holder of claim 1 .

3. At least two of the coolant 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 different positions in an 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 of the coolant flow paths are provided for each of the multiple mounting portions. The holder of claim 1 .

7. One of the two coolant passages is a rake face passage that is connected to an internal passage 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 passages is a clearance passage that is connected to an internal passage of the cartridge that opens on the clearance side of the cutting edge of the cutting insert. The holder according to claim 7.

9. An adjustment mechanism is provided that can adjust the amount of coolant flowing through the rake face flow passage and the flank face flow passage. The holder of claim 8.

10. A 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 passage that opens in the vicinity of the cutting insert and communicates with the coolant passage when the cartridge is attached to the attachment portion; cutting tools.

11. A cartridge having an internal flow passage and holding a cutting insert; a holder that is attached to a machine tool and that has a plurality of mounting sections to which the cartridge is attached, and a coolant flow passage that opens on a surface of at least one of the mounting sections that contacts the cartridge and communicates with the internal flow passage when the cartridge is attached to the mounting section; A processing 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 for machining; a fourth step of machining the workpiece with a cutting insert of a type different from the first type; The processing method includes:

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

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

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