Cutting tool

Abstract

This cutting tool (18) comprises a tool shaft (34), a blade implement (36), a position adjustment mechanism (38), and a pressing mechanism (40). The blade implement (36) is disposed so as to be capable of moving into an insertion hole (44) in the tool shaft (34). The position adjustment mechanism (38) is capable of adjusting the position of the blade implement (36) relative to the tool shaft (34). The pressing mechanism (40) is attached to the tool shaft (34). The pressing mechanism (40) presses a grinding relief part (68) of the blade implement (36). The pressing mechanism (40) biases the blade implement (36) toward a base end. The pressing mechanism (40) biases the blade implement (36) toward an inner peripheral surface (441) of the insertion hole (44).

Description

Technical Field

[0001] The present invention relates to a cutting tool used in a cutting machine for machining a workpiece.

Background Art

[0002] The cutting machine disclosed in Japanese Patent Application Laid-Open No. 2007-253305 has a rotatable tool body. The outer peripheral portion of the tool body is provided with a plurality of mounting seats along the rotation direction of the tool body. An insert and a clamping member are attached to the plurality of mounting seats. The insert is movable along the first and second mounting surfaces of the mounting seat. A cutting edge portion is provided at the tip of the insert. The tip of an adjustment screw screwed into the mounting seat can abut against the rear end of the insert. The adjustment screw is disposed obliquely with respect to the insert.

[0003] The clamping member is fixed to the tool body from the radially outer side by a fixing screw. In the mounting seat, the insert is clamped and fixed by the clamping member.

[0004] When adjusting the position of the cutting edge, after loosening the fixing screw and tilting the clamping member, the adjustment screw is screwed in to press the rear end of the insert. As a result, the insert moves radially outward of the tool body along the first and second mounting surfaces. Along with the movement of the insert, the position of the cutting edge portion is adjusted. Then, by tightening the fixing screw again, the insert is fixed to the tool body.

Summary of the Invention

[0005] The tool body is rotated to machine the workpiece with the cutting edge of the insert. At this time, a reaction force is applied to the insert from the workpiece due to the contact between the cutting edge of the insert and the workpiece. When the fixing screw is tightened finally, the posture of the clamp member and the insert may change due to the frictional torque generated. As a result, if there is a lift at the tip of the insert, the insert is pressed and moved in a direction away from the first mounting surface or the second mounting surface by the reaction force during machining. There is a problem that the machining accuracy of the workpiece by the cutting edge portion deteriorates when the insert moves from a predetermined position. When adjusting the position of the cutting edge portion, it is necessary to loosen the fixing screw, tilt the clamp member, and then screw the adjusting screw.

[0006] Also, when the adjusting screw is retracted, the insert may not be retracted. Therefore, it is necessary to precisely screw and adjust without going back using two fixing screws and the adjusting screw, and the adjustment work is complicated.

[0007] An object of the present invention is to solve the above-described problems.

[0008] An aspect of the present invention is a cutting tool used in a cutting machine for machining a workpiece, a shaft that is rotationally driven by a drive mechanism, a tip portion formed with a cutting edge portion, and a base end portion opposite to the tip portion, and is inserted into an insertion hole provided in the shaft so as to extend in a direction intersecting the axial direction of the shaft, and is movable in the hole axial direction of the insertion hole, and the cutting edge portion is disposed so as to protrude radially outward from the outer peripheral surface of the shaft, a cutting tool, a position adjusting mechanism attached to the shaft and capable of adjusting the position of the cutting tool in the hole axial direction with respect to the shaft, a pressing mechanism attached to the shaft and pressing a pressed portion disposed between the cutting edge portion and the base end portion of the cutting tool to bias the cutting tool toward the base end portion and bias the cutting tool toward the inner surface of the insertion hole, and comprising.

[0009] According to the present invention, the following effects can be obtained.

[0010] That is, when the shaft rotates and the workpiece is machined by the cutting tool, a reaction force from the workpiece is applied to the cutting edge portion of the cutting tool. At this time, the pressed portion of the cutting tool is pressed by the pressing mechanism, and the cutting tool is biased toward the base end portion of the cutting tool and also biased toward the inner surface of the insertion hole. As a result, the cutting tool is firmly fixed to the shaft. Therefore, when a reaction force from the workpiece is applied to the cutting edge portion of the cutting tool, rattling of the cutting tool with respect to the shaft is prevented. The protruding amount of the cutting edge portion of the cutting tool can be easily and highly accurately adjusted radially outward or radially inward by the position adjusting mechanism. After adjusting the position of the cutting edge portion, there is no need to tighten the fixing screw as in the prior art, so that the posture of the cutting tool does not change.

[0011] As a result, the workpiece can be machined with high precision by the cutting tool. By using the polished relief surface of the cutting edge portion as the pressed portion and applying a preload for biasing the cutting tool toward the base end by the pressing mechanism to the pressed portion, the manufacturing cost can be reduced as compared with the case of newly forming the portion pressed by the pressing mechanism.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0013] The cutting machine 10 is used to perform hole machining on a workpiece W. The workpiece W is a cylinder of an internal combustion engine mounted on a vehicle. As shown in FIGS. 1 and 2, the cutting machine 10 includes a base 12, a main body frame 14, a drive mechanism 16, a cutting tool 18, and a transfer mechanism 20.

[0014] The base 12 is disposed at the lower part of the cutting machine 10. The base 12 is placed on a floor surface or the like.

[0015] The main body frame 14 stands upright upward from the base 12. The main body frame 14 includes a guide rail 22. The guide rail 22 is disposed on the outer peripheral surface of the main body frame 14. The guide rail 22 extends along the axial direction of the main body frame 14.

[0016] The drive mechanism 16 is disposed at the upper part of the main body frame 14. The drive mechanism 16 includes a lifting table 24 and a drive motor 26. The lifting table 24 is movable in the vertical direction along the guide rail 22 of the main body frame 14. The drive motor 26 is fixed to the upper part of the lifting table 24. The drive motor 26 has a drive shaft (not shown). The drive shaft extends downward through the lifting table 24. A rotary shaft 30 of a tool head 28 is connected to the lower end of the drive shaft.

[0017] Four tool heads 28 are provided. The tool heads 28 are disposed on the outer periphery of the main body frame 14. Each tool head 28 is held by a head carrier 32. The four tool heads 28 are arranged at equal intervals in the circumferential direction of the head carrier 32.

[0018] Each tool head 28 includes a rotating shaft 30. The rotating shaft 30 is rotatably supported by the tool head 28. The rotating shaft 30 extends downward from the tool head 28. The upper end of the rotating shaft 30 is connected to a drive shaft (not shown) of the drive motor 26 in the drive mechanism 16. The lower end of the rotating shaft 30 is connected to the upper end of the tool shaft 34. By energizing the drive motor 26, the drive shaft and the rotating shaft 30 rotate.

[0019] As shown in FIGS. 3 to 6, the cutting tool 18 includes a tool shaft 34 (shaft), a cutting tool 36, a position adjustment mechanism 38, and a pressing mechanism 40.

[0020] As shown in FIGS. 1 to 5, the tool shaft 34 is detachably arranged on the tool head 28. The tool shaft 34 is an elongated shaft body along the axial direction. The cross-sectional shape of the tool shaft 34 is circular. The tool shaft 34 extends downward from the tool head 28 with a constant diameter. The upper end of the tool shaft 34 can be connected to the lower end of the rotating shaft 30. When the drive motor 26 rotates, the tool shaft 34 rotates together with the rotating shaft 30. The lower end of the tool shaft 34 can be inserted into the bearing of the second bearing portion 102 in the jig 94 described later. In the present embodiment, the tool shaft 34 is a boring bar.

[0021] The tool shaft 34 includes a plurality of accommodating portions 42. The plurality of accommodating portions 42 are spaced apart from each other at substantially equal intervals along the axial direction of the tool shaft 34. The plurality of accommodating portions 42 can accommodate the cutting tool 36, the position adjustment mechanism 38, and the pressing mechanism 40.

[0022] The accommodating portion 42 includes an insertion hole 44, a bolt hole 46, and a recess 48.

[0023] The axial direction (hole axis direction) of the insertion hole 44 intersects the axial direction of the tool shaft 34. In the present embodiment, the insertion hole 44 penetrates in a direction orthogonal to the axial direction of the tool shaft 34. The axial direction of the insertion hole 44 may be inclined with respect to the axial direction of the tool shaft 34. The insertion hole 44 is linear. The central axis of the insertion hole 44 passes through the axis P of the tool shaft 34 (see FIG. 4). The insertion hole 44 has a first hole portion 50 and a second hole portion 52. A cutting tool 36 of a cutting tool 18 described later is inserted into the insertion hole 44.

[0024] The first hole portion 50 is arranged from the center along the extending direction of the insertion hole 44 toward one end of the insertion hole 44. The first hole portion 50 has a constant diameter along the axial direction of the insertion hole 44. The first hole portion 50 opens to the outer peripheral surface of the tool shaft 34.

[0025] The second hole portion 52 is arranged from the center along the extending direction of the insertion hole 44 toward the other end of the insertion hole 44. The second hole portion 52 and the first hole portion 50 are connected in the vicinity of the center along the axial direction of the insertion hole 44. The second hole portion 52 has a larger diameter than the first hole portion 50. The second hole portion 52 opens to the outer peripheral surface of the tool shaft 34. The inner peripheral surface of the second hole portion 52 has an inner peripheral thread portion 54. An adjustment member 76 of a position adjustment mechanism 38 described later is screwed into the second hole portion 52.

[0026] The bolt hole 46 penetrates in a direction orthogonal to the axial direction of the tool shaft 34. The bolt hole 46 and the insertion hole 44 are spaced apart in the axial direction of the tool shaft 34. In the present embodiment, the bolt hole 46 is arranged above the insertion hole 44 (see FIG. 3). The central axis of the bolt hole 46 passes through the axis P of the tool shaft 34. A fastening bolt 86 of a pressing mechanism 40 described later is inserted into the bolt hole 46.

[0027] When viewed axially from the tool shaft 34 shown in Fig. 4, the central axis of the bolt hole 46 and the central axis of the insertion hole 44 intersect at a predetermined angle. The central axis of the bolt hole 46 and the central axis of the insertion hole 44 intersect on the axis P of the tool shaft 34 (see Figs. 4 and 5). When viewed axially from the tool shaft 34 shown in Fig. 4, the bolt hole 46 is arranged at a predetermined angle inclined in the rotational direction (arrow A direction) of the tool shaft 34 with respect to the insertion hole 44. When viewed axially from the tool shaft 34 shown in Fig. 4, the rotational direction of the tool shaft 34 is clockwise.

[0028] The bolt hole 46 has a small-diameter portion 56 and a large-diameter portion 58. The bolt hole 46 is linear.

[0029] The small-diameter portion 56 is arranged at one end along the extending direction of the bolt hole 46. The small-diameter portion 56 opens to the outer peripheral surface of the tool shaft 34. The small-diameter portion 56 has a constant diameter along the extending direction of the bolt hole 46. The small-diameter portion 56 extends from one end to the vicinity of the other end along the extending direction of the bolt hole 46. When viewed axially from the tool shaft 34 shown in Fig. 4, the small-diameter portion 56 opens at a position directed in the rotational direction (arrow A direction) of the tool shaft 34 with respect to the first hole portion 50 of the insertion hole 44.

[0030] The large-diameter portion 58 is arranged at the other end along the extending direction of the bolt hole 46. The large-diameter portion 58 has a larger diameter than the small-diameter portion 56. The large-diameter portion 58 opens to the outer peripheral surface of the tool shaft 34. The large-diameter portion 58 and the small-diameter portion 56 are connected in the vicinity of the other end of the bolt hole 46. When viewed axially from the tool shaft 34 shown in Fig. 4, the large-diameter portion 58 opens at a position directed in the rotational direction (arrow A direction) of the tool shaft 34 with respect to the second hole portion 52 of the insertion hole 44.

[0031] The recess 48 is recessed radially inward from the outer peripheral surface of the tool shaft 34. When viewed from the axial direction of the tool shaft 34 shown in FIGS. 4 and 5, the cross-sectional shape of the recess 48 is substantially rectangular. The recess 48 is in the shape of a long rectangle along the axial direction of the tool shaft 34. The upper part of the recess 48 faces the small-diameter portion 56 of the bolt hole 46. The lower part of the recess 48 faces the first hole portion 50 of the insertion hole 44. The recess 48 is arranged so as to connect the small-diameter portion 56 of the bolt hole 46 and the first hole portion 50 of the insertion hole 44.

[0032] The recess 48 has a flat holding surface 60. The holding surface 60 is a surface spaced radially inward from the outer peripheral surface of the tool shaft 34. The holding surface 60 extends along the axial direction of the tool shaft 34. In the upper part of the recess 48, the small-diameter portion 56 of the bolt hole 46 opens at the center of the holding surface 60. The central axis of the bolt hole 46 is orthogonal to the holding surface 60 (see FIG. 5).

[0033] In the lower part of the recess 48, a part of the first hole portion 50 opens in the holding surface 60. The recess 48 is arranged offset in the circumferential direction of the tool shaft 34 with respect to the central axis of the first hole portion 50. The recess 48 is arranged offset in the rotational direction (arrow A direction) of the tool shaft 34 with respect to the central axis of the first hole portion 50. The recess 48 communicates with the insertion hole 44.

[0034] The cutting tool 36 has a main body portion 62, a cutting edge portion 64, a screw portion 66, and a grinding relief portion (pressed portion) 68. The main body portion 62 is a shaft body. The cross-sectional shape of the main body portion 62 is circular. The diameter of the main body portion 62 is substantially the same as the diameter of the first hole portion 50 of the insertion hole 44. The main body portion 62 is inserted into the first hole portion 50.

[0035] The cutting edge portion 64 is arranged at the tip portion along the axial direction of the main body portion 62. The cutting edge portion 64 projects in a direction away from the main body portion 62. The cutting edge portion 64 projects radially outward from the outer peripheral surface of the tool shaft 34.

[0036] The cutting edge portion 64 includes a cutting relief surface 70 and a cutting edge tip 72. The cutting relief surface 70 is inclined from the outer peripheral surface of the main body portion 62 toward the central axis of the cutting tool 36. When viewed from the axial direction of the tool shaft 34 shown in FIG. 4, the cutting relief surface 70 is a plane extending from the outer peripheral surface of the main body portion 62 to a position beyond the central axis of the cutting tool 36.

[0037] The cutting edge tip 72 is provided at the tip of the cutting relief surface 70. The cutting edge tip 72 extends in an oblique direction inclined at a predetermined angle with respect to the central axis of the cutting tool 36. When viewed from the axial direction of the tool shaft 34 shown in FIG. 4, the cutting edge tip 72 is an acute angle. When the cutting tool 36 is attached to the tool shaft 34, the cutting edge tip 72 is arranged in the rotational direction (arrow A direction) of the tool shaft 34 rather than the central axis of the cutting tool 36. The cutting edge tip 72 protrudes toward the rotational direction (arrow A direction) of the tool shaft 34 rather than the central axis of the cutting tool 36.

[0038] By rotating the tool shaft 34, the inner peripheral surface of the machining pilot hole H (see FIG. 2) in the workpiece W is machined by the cutting edge portion 64 of the cutting tool 36.

[0039] The threaded portion 66 is arranged at the proximal end of the main body portion 62 along the axial direction of the main body portion 62. The threaded portion 66 extends in a direction away from the proximal end of the main body portion 62. The threaded portion 66 has a male thread. The threaded portion 66 is accommodated in the second hole portion 52 of the insertion hole 44.

[0040] The grinding relief portion 68 is arranged between the cutting edge portion 64 and the threaded portion 66 and adjacent to the cutting edge portion 64. The grinding relief portion 68 has a shape cut out from the tip of the cutting tool 36 toward the main body portion 62. When viewed from the axial direction of the tool shaft 34 shown in FIG. 4, the grinding relief portion 68 is arranged in the direction opposite to the cutting edge portion 64 (arrow A direction) with respect to the central axis of the main body portion 62. The grinding relief portion 68 has a pressed surface (inclined surface) 74. The pressed surface 74 is inclined with respect to the central axis of the cutting tool 36. The pressed surface 74 is a grinding relief surface.

[0041] When the cutting tool 36 is inserted into the insertion hole 44 of the tool shaft 34, the pressed surface 74 is orthogonal to the central axis of the bolt hole 46. The inclination angle of the pressed surface 74 with respect to the central axis of the cutting tool 36 is the same as the inclination angle of the holding surface 60 of the recess 48 with respect to the central axis of the insertion hole 44 (see Fig. 4). When the cutting tool 36 is inserted into the insertion hole 44 of the tool shaft 34, the polishing relief portion 68 is arranged in the rotational direction (arrow A direction) of the tool shaft 34 with respect to the cutting edge portion 64.

[0042] The position adjustment mechanism 38 is arranged in the second hole portion 52 of the insertion hole 44. The position adjustment mechanism 38 includes an adjustment member 76. The adjustment member 76 is cylindrical. The adjustment member 76 includes a male screw portion 78, a female screw portion 80, and an adjustment hole portion 82.

[0043] The male screw portion 78 is arranged on the outer peripheral surface of the adjustment member 76. The screw pitch of the male screw portion 78 is the first pitch. The male screw portion 78 is screwed into the inner peripheral screw portion 54 of the second hole portion 52. The screw pitches of the male screw portion 78 and the inner peripheral screw portion 54 are the same first pitch.

[0044] The female screw portion 80 is arranged on the inner peripheral surface of the adjustment member 76. The female screw portion 80 penetrates in the axial direction of the adjustment member 76. The screw pitch of the female screw portion 80 is the second pitch. The screw portion 66 of the cutting tool 36 is screwed into the female screw portion 80. The screw pitches of the female screw portion 80 and the screw portion 66 are the same second pitch. The second pitch of the female screw portion 80 is smaller than the first pitch of the male screw portion 78. The screw portion 66 of the cutting tool 36 is fixed to the second hole portion 52 of the insertion hole 44 by the adjustment member 76.

[0045] The adjustment hole portion 82 is disposed at the proximal end of the adjustment member 76 and opens. The adjustment hole portion 82 penetrates the female screw portion 80. When viewed from the axial direction of the adjustment member 76, the adjustment hole portion 82 has a hexagonal shape. An adjustment tool (not shown) with a hexagonal tip is inserted into the adjustment hole portion 82, and the adjustment member 76 can be rotated. By rotating the adjustment member 76, the adjustment member 76 can move along the central axis of the second hole portion 52. When the adjustment member 76 rotates, the tool 36 screwed to the screw portion 66 can move along the central axis of the insertion hole 44 together with the adjustment member 76. That is, the tool 36 is movably held in the axial direction of the insertion hole 44 by the adjustment member 76.

[0046] At this time, the second pitch of the female screw portion 80 into which the screw portion 66 of the tool 36 is screwed is smaller than the first pitch of the inner peripheral screw portion 54 with which the adjustment member 76 is screwed. Therefore, when the adjustment member 76 advances at the first pitch in the axial direction along the inner peripheral screw portion 54, the tool 36 retreats at the second pitch in the axial direction along the female screw portion 80 of the adjustment member 76. That is, the tool 36 advances in the axial direction by the difference between the first pitch and the second pitch.

[0047] The pressing mechanism 40 includes a pressing member 84 and a fastening bolt 86.

[0048] The pressing member 84 is an elastic plate material (leaf spring). The pressing member 84 has a rectangular shape corresponding to the recess 48 of the tool shaft 34. The pressing member 84 is housed in the recess 48. The pressing member 84 is fitted into the recess 48 in its width direction. Thereby, the pressing member 84 is positioned in the recess 48. The pressing member 84 abuts against the holding surface 60 of the recess 48. The pressing member 84 does not protrude from the outer peripheral surface of the tool shaft 34 (see FIGS. 4 and 5). The upper portion of the pressing member 84 has a screw hole 88. In the recess 48, the screw hole 88 faces the small-diameter portion 56 of the bolt hole 46. A fastening bolt 86 inserted through the bolt hole 46 is screwed into the screw hole 88.

[0049] The lower part of the pressing member 84 faces the first hole portion 50 of the insertion hole 44. The lower part of the pressing member 84 abuts against the pressed surface 74 of the grinding relief portion 68 of the cutting tool 36 (see FIG. 4).

[0050] When viewed from the axial direction of the tool shaft 34 shown in FIG. 4, when a line segment passing through the cutting edge 72, which is parallel to the central axis of the cutting tool 36, is defined as the virtual line L, it is desirable that the pressing member 84 be disposed at a position spaced apart from the cutting edge 72 with respect to the virtual line L. Thereby, when replacing the cutting tool 36 due to chipping or the like of the cutting edge 72, it becomes possible to eliminate the need to remove the pressing member 84. That is, the cutting tool 36 can be replaced with the pressing member 84 attached.

[0051] The fastening bolt 86 is inserted into the bolt hole 46 of the tool shaft 34. The fastening bolt 86 has a head 90 and a shaft portion 92. The head 90 is received in the large-diameter portion 58 of the bolt hole 46. The head 90 is exposed to the outside through the large-diameter portion 58. The shaft portion 92 has a smaller diameter than the head 90. The shaft portion 92 is connected to the head 90 and extends in the axial direction. The shaft portion 92 is inserted into the small-diameter portion 56 of the bolt hole 46. Threads are provided on the outer peripheral surface of the shaft portion 92. The tip of the shaft portion 92 is screwed into the screw hole 88 of the pressing member 84 at the recess 48.

[0052] The head 90 of the fastening bolt 86 can be rotated from the outside of the tool shaft 34. When the fastening bolt 86 is rotated, the pressing member 84 screwed to the shaft portion 92 moves toward the holding surface 60 at the recess 48. As the pressing member 84 moves toward the holding surface 60, the pressed surface 74 of the cutting tool 36 is pressed by the pressing member 84. The pressed surface 74 is pressed by the pressing member 84 along the central axis direction of the bolt hole 46 and the fastening bolt 86.

[0053] The cutting tool 36 is pressed toward the base end by the pressing member 84, and the base end of the cutting tool 36 is movably held by the adjusting member 76 on the tool shaft 34.

[0054] As shown in FIGS. 1 and 2, the main body frame 14 includes four jigs 94. The jig 94 can hold the workpiece W. Each jig 94 is rotatably held by a support carrier. When the support carrier rotates, one of the four jigs 94 faces the support block 96 and is held by the support block 96.

[0055] The jig 94 includes a jig body 98 and first and second bearing portions 100, 102. The first bearing portion 100 is disposed at the upper end of the jig body 98. The second bearing portion 102 is disposed at the lower end of the jig body 98.

[0056] When the tool shaft 34 descends together with the tool head 28, the upper portion of the tool shaft 34 is inserted into a bearing (not shown) of the first bearing portion 100. When the tool shaft 34 descends together with the tool head 28, the lower end of the tool shaft 34 is inserted into a bearing (not shown) of the second bearing portion 102. Thereby, the tool shaft 34 is rotatably supported by the bearings of the first and second bearing portions 100, 102.

[0057] As shown in FIG. 1, the transfer mechanism 20 is disposed on the upper portion of the base 12. The transfer mechanism 20 is disposed radially outward of the main body frame 14. The transfer mechanism 20 includes a moving table 104, a cylinder 106, a workpiece holder 108, a pallet 110, and a pallet holding portion 112. The moving table 104 is movable along the base 12. The cylinder 106 biases the moving table 104 in a direction approaching or separating from the main body frame 14. The workpiece holder 108 is held by the moving table 104. A pallet holding portion 112 is attached to an end of the workpiece holder 108. The pallet holding portion 112 can hold the workpiece W via the pallet 110.

[0058] Next, a case of adjusting the position of the cutting tool 36 of the cutting tool 18 with respect to the tool shaft 34 will be described.

[0059] First, when increasing the protrusion amount T (see FIG. 4) of the cutting edge portion 64 of the cutting tool 36 with respect to the outer peripheral surface of the tool shaft 34, an operator inserts an adjustment tool (not shown) into the adjustment hole portion 82 of the adjustment member 76. By rotating the adjustment tool in a predetermined direction, the adjustment member 76 is rotated.

[0060] When the adjustment member 76 rotates, the adjustment member 76 moves along the central axis of the second hole portion 52 toward the first hole portion 50. At this time, the amount of movement of the adjustment member 76 is an amount of movement corresponding to the first pitch, which is the thread pitch of the male screw portion 78 and the inner peripheral screw portion 54.

[0061] Since the rotation of the cutting tool 36 in the insertion hole 44 is blocked by the pressing member 84 having a predetermined angle, the cutting tool 36 does not rotate even when the adjustment member 76 rotates. Therefore, as the adjustment member 76 rotates, the screw portion 66 of the cutting tool 36 and the adjustment member 76 rotate relative to each other. When the screw portion 66 rotates relative to the adjustment member 76, the adjustment member 76 and the main body portion 62 of the cutting tool 36 are axially displaced relative to each other in a direction in which they approach each other (the direction in which the screw portion 66 is drawn into the adjustment member 76). At this time, the relative movement amount of the cutting tool 36 (screw portion 66) with respect to the adjustment member 76 is an amount of movement corresponding to the second pitch, which is the thread pitch of the female screw portion 80 and the screw portion 66. Here, let the movement amount of the adjustment member 76 in the insertion hole 44 when the adjustment member 76 is rotated by a predetermined angle be D1, and the relative movement amount between the adjustment member 76 and the cutting tool 36 accompanying the rotation of the adjustment member 76 be D2. The axial movement amount D in the insertion hole 44 of the cutting tool 36 is D1 - D2.

[0062] Therefore, when the adjustment member 76 is rotated to move the adjustment member 76 toward the tip of the cutting tool 36, it is possible to slightly move the cutting tool 36 toward the tip with respect to the adjustment member 76. At this time, the tip of the cutting tool 36 moves radially outward against the pressing force of the pressing member 84. That is, in a state where the pressing member 84 applies preload to the cutting tool 36, the cutting tool 36 can be moved toward the tip without rattling. Thereby, it becomes possible to easily and highly accurately adjust the protrusion amount T of the cutting edge portion 64 in the cutting tool 36 by rotating the adjustment member 76.

[0063] At this time, by the pressing member 84 of the pressing mechanism 40, the cutting tool 36 is pressed in a direction inclined at a predetermined angle with respect to the central axis of the cutting tool 36 via the pressed surface 74 of the grinding relief portion 68. The main body portion 62 of the cutting tool 36 is biased toward the inner peripheral surface 441 of the first hole portion 50 in a direction opposite to the rotation direction of the tool shaft 34 (direction of arrow B) with respect to the central axis of the cutting tool 36. The outer peripheral surface of the main body portion 62 comes into contact with and is pressed against the inner peripheral surface 441 of the first hole portion 50.

[0064] In this way, by rotating the adjusting member 76 of the position adjusting mechanism 38, the cutting tool 36 can be advanced along the central axis of the insertion hole 44, and the protruding amount T of the cutting edge portion 64 from the outer peripheral surface of the tool shaft 34 can be increased. After the position of the cutting edge portion 64 of the cutting tool 36 is adjusted, the cutting tool 36 is firmly pressed against and fixed to the inner peripheral surface 441 of the insertion hole 44 by the pressing member 84.

[0065] Next, when reducing the protruding amount T of the cutting edge portion 64 of the cutting tool 36 with respect to the outer peripheral surface of the tool shaft 34, the operator rotates the adjusting member 76 in a direction opposite to the above by a tool (not shown). As a result, the adjusting member 76 rotates and moves in a direction away from the first hole portion 50 along the central axis of the second hole portion 52. At this time, the moving amount of the adjusting member 76 is a moving amount corresponding to the first pitch which is the screw pitch of the male screw portion 78 and the inner peripheral screw portion 54.

[0066] With the rotation of the adjusting member 76, the screw portion 66 of the cutting tool 36 and the adjusting member 76 rotate relative to each other. By the screw portion 66 rotating with respect to the adjusting member 76, the adjusting member 76 and the cutting tool 36 are relatively displaced in a direction in which the adjusting member 76 and the main body portion 62 of the cutting tool 36 separate from each other along the central axis of the insertion hole 44. At this time, the moving amount of the cutting tool 36 (screw portion 66) is a moving amount corresponding to the second pitch which is the screw pitch of the female screw portion 80 and the screw portion 66. That is, the moving distance of the cutting tool 36 becomes shorter than the moving distance of the adjusting member 76.

[0067] Therefore, when the adjusting member 76 is rotated to move the adjusting member 76 toward the proximal end of the cutting tool 36, the cutting tool 36 can be slightly moved toward the proximal end with respect to the adjusting member 76. That is, with the pressing member 84 applying a preload to the cutting tool 36, the cutting tool 36 can be moved toward the proximal end without rattling. As a result, it becomes possible to easily and highly accurately adjust the protruding amount T of the cutting edge portion 64 of the cutting tool 36 by rotating the adjusting member 76.

[0068] At this time, the cutting tool 36 is pressed by the pressing member 84 of the pressing mechanism 40 in a direction inclined at a predetermined angle with respect to the central axis of the cutting tool 36 via the pressed surface 74 of the grinding relief portion 68. The main body portion 62 of the cutting tool 36 is biased toward the inner peripheral surface 441 of the first hole portion 50 in a direction opposite to the rotation direction of the tool shaft 34 (arrow B direction) with respect to the central axis of the cutting tool 36. The outer peripheral surface of the main body portion 62 comes into contact with and is pressed against the inner peripheral surface 441 of the first hole portion 50.

[0069] In this way, by rotating the adjusting member 76 of the position adjusting mechanism 38, the cutting tool 36 can be retracted along the central axis of the insertion hole 44, and the protruding amount T of the cutting edge portion 64 from the outer peripheral surface of the tool shaft 34 can be reduced. After the position of the cutting edge portion 64 is adjusted, the cutting tool 36 is firmly pressed against and fixed to the inner peripheral surface 441 of the insertion hole 44 by the pressing member 84.

[0070] Next, the operation of the cutting machine 10 using the cutting tool 18 will be described.

[0071] First, at a position where the moving table 104 of the transfer mechanism 20 is separated from the main body frame 14, the workpiece W is held on the pallet 110. The cylinder 106 is driven to move the moving table 104 together with the workpiece holder 108 toward the main body frame 14. The workpiece W is held by the jig 94. The support block 96 is sent out toward the jig 94 to hold the jig 94 with the support block 96.

[0072] Next, a feed mechanism (not shown) is driven to lower the drive mechanism 16 and the tool head 28 toward the workpiece W. As a result, the cutting tool 18 descends together with the tool head 28. The cutting tool 18 is inserted into the machining lower hole H of the workpiece W. The upper and lower ends of the tool shaft 34 are rotatably supported by the first and second bearing portions 100 and 102.

[0073] The workpiece W is slightly moved horizontally by the transfer mechanism 20 to align the axial center of the machining lower hole H of the workpiece W with the axis P of the tool shaft 34. The drive motor 26 is driven to further lower the tool shaft 34 while rotating it. As a result, the cutting tool 18 rotates together with the tool shaft 34. The inner peripheral surface of the machining lower hole H is machined by the cutting edges 64 of the cutting tools 36 in the plurality of cutting tools 18. The inner peripheral surface of the machining lower hole H in the workpiece W is machined to a desired inner diameter.

[0074] At this time, the pressed surface 74 of the cutting tool 36 is pressed by the pressing member 84, the cutting tool 36 is biased toward the base end, and the main body portion 62 of the cutting tool 36 is pressed against and fixed to the inner peripheral surface 441 of the insertion hole 44. Therefore, when machining the machining lower hole H of the workpiece W with the cutting tool 36, even if a reaction force from the workpiece W is applied to the cutting edge 64, rattling of the cutting tool 36 due to the reaction force is preferably suppressed. The machining lower hole H of the workpiece W is machined with high precision by the cutting tool 36 firmly fixed to the tool shaft 34.

[0075] As described above, in the embodiment of the present invention, in the cutting tool 18 used in the cutting machine 10 for machining the workpiece W, the cutting tool 36, the position adjusting mechanism 38, and the pressing mechanism 40 are provided. The cutting tool 36 is movably disposed in the insertion hole 44 of the tool shaft 34. The position adjusting mechanism 38 can adjust the axial position of the cutting tool 36 with respect to the tool shaft 34. The pressing mechanism 40 presses the polishing relief portion 68 of the cutting tool 36. The pressing mechanism 40 biases the cutting tool 36 toward the base end of the cutting tool 36. The pressing mechanism 40 biases the cutting tool 36 toward the inner peripheral surface 441 of the insertion hole 44.

[0076] By moving the cutting tool 36 along the insertion hole 44 by the position adjusting mechanism 38, the radially outward protruding amount T of the cutting edge portion 64 of the cutting tool 36 with respect to the outer peripheral surface of the tool shaft 34 can be adjusted. By pressing the pressed surface 74 provided in the vicinity of the cutting edge portion 64 at a predetermined angle by the substantially plate spring-like pressing member 84 in the pressing mechanism 40, while pressing the cutting tool 36 from the vicinity of the cutting edge portion 64 toward the proximal end, it can be pressed in a direction intersecting the central axis of the cutting tool 36 and pressed against the inner peripheral surface 441 of the insertion hole 44. Thereby, the cutting tool 36 can be firmly fixed to the tool shaft 34. The pressing direction of the cutting tool 36 is the direction opposite to the rotation direction of the tool shaft 34 (direction of arrow B).

[0077] When the tool shaft 34 rotates and the workpiece W is machined by the cutting tool 36, even if a reaction force from the workpiece W is applied to the cutting edge portion 64 of the cutting tool 36, rattling of the cutting tool 36 in the insertion hole 44 is prevented. As a result, when the workpiece W is machined by the cutting tool 18, vibration of the cutting tool 36 due to contact with the workpiece W is suppressed. Therefore, the workpiece W can be machined with high precision by the cutting tool 36.

[0078] Even when the tool shaft 34 has a small diameter, the protruding amount T of the cutting edge portion 64 of the cutting tool 36 can be adjusted with high precision both radially outward and radially inward by the position adjusting mechanism 38.

[0079] The grinding relief portion 68 of the cutting tool 36 is a stepped portion in which a part of the main body portion 62 is cut out. The grinding relief portion 68 is arranged in the rotation direction of the tool shaft 34 with respect to the cutting edge portion 64 of the cutting tool 36 and has a pressed surface 74 inclined with respect to the central axis of the cutting tool 36. By the pressing member 84 of the pressing mechanism 40 coming into contact with and pressing the pressed surface 74, the cutting tool 36 can be pressed in the direction opposite to the rotation direction of the tool shaft 34 (direction of arrow B). The main body portion 62 of the cutting tool 36 can be pressed against the inner peripheral surface 441 of the insertion hole 44 and fixed. Thereby, by using the grinding relief portion 68 of the cutting tool 36 and pressing the pressed surface 74 of the grinding relief portion 68 by the pressing member 84, the cutting tool 36 can be surely fixed to the insertion hole 44 of the tool shaft 34.

[0080] By adopting a configuration in which the grinding relief portion 68 (pressed surface 74) in the cutting tool 36 is used as the pressed portion and can be pressed by the pressing member 84 to apply preload, the manufacturing cost of the cutting tool 18 can be reduced as compared with the case where a new portion to be pressed by the pressing member 84 is provided.

[0081] By pressing the grinding relief portion 68 close to the cutting edge portion 64 with the pressing member 84, the cutting tool 36 can be firmly fixed to the tool shaft 34, and the rigidity of the cutting tool 36 can be increased. Accordingly, vibration of the cutting tool 36 when machining the workpiece W with the cutting tool 36 can be prevented.

[0082] The pressing mechanism 40 includes a pressing member 84 that presses the pressed surface 74 of the grinding relief portion 68 of the cutting tool 36, and a fastening bolt 86 that is inserted into the bolt hole 46 of the tool shaft 34. The shaft portion 92 of the fastening bolt 86 is screwed into the screw hole 88 of the pressing member 84. By rotating the fastening bolt 86 to bias the pressing member 84 toward the tool shaft 34 and the cutting tool 36, the pressed surface 74 of the cutting tool 36 is pressed by the pressing member 84, and the cutting tool 36 can be pressed against the inner peripheral surface 441 of the insertion hole 44 and firmly fixed. After the cutting tool 36 is positioned on the tool shaft 34, since it is not necessary to screw the fastening bolt 86, the posture of the cutting tool 36 is maintained without change.

[0083] When viewed from the axial direction of the tool shaft 34, the pressing member 84 is arranged in a direction away from the cutting edge portion 64 with respect to an imaginary line L that is parallel to the central axis of the cutting tool 36 and passes through the cutting edge 72 of the cutting edge portion 64. Thus, when removing and replacing the cutting tool 36 from the tool shaft 34 and pulling out the cutting tool 36 from the insertion hole 44 in the direction of the second hole portion 52, the cutting edge 72 (cutting edge portion 64) of the cutting tool 36 and the pressing member 84 do not come into contact. Therefore, when replacing the cutting tool 36, the replacement operation can be performed without removing the pressing member 84. The same applies when attaching a new cutting tool 36 to the tool shaft 34.

[0084] That is, when performing the replacement operation of the cutting tool 36, it is possible to easily perform the replacement operation without removing the pressing member 84.

[0085] The position adjusting mechanism 38 includes an adjusting member 76. The adjusting member 76 has a male screw portion 78 screwed onto the inner peripheral surface 441 of the insertion hole 44 of the tool shaft 34 and a female screw portion 80 screwed onto the screw portion 66 of the cutting tool 36. The adjusting member 76 is rotatably disposed in the second hole portion 52 of the insertion hole 44. The screw pitch of the female screw portion 80 is smaller than the screw pitch of the male screw portion 78. Thus, by rotating the adjusting member 76, the cutting tool 36 screwed to the adjusting member 76 can be moved along the axial direction, and the protruding amount T of the cutting edge portion 64 with respect to the outer peripheral surface of the tool shaft 34 can be adjusted. As described above, the screw pitch of the female screw portion 80 is smaller than the screw pitch of the male screw portion 78. Therefore, when the adjusting member 76 is rotated, the cutting tool 36 can be slightly moved in the axial direction.

[0086] As a result, the protruding amount T of the cutting tool 36 with respect to the outer peripheral surface of the tool shaft 34 can be adjusted with high precision. In the cutting tool of the prior art, two adjusting screws and a fixing screw are provided, and the adjustment operation is performed using the adjusting screw and the fixing screw. In contrast, in the present invention, by rotating the adjusting member 76, the adjustment operation of the protruding amount T of the cutting tool 36 can be performed. Therefore, the man-hours for adjusting the protruding amount T of the cutting tool 36 can be reduced.

[0087] The pressing member 84 is disposed along the axial direction of the tool shaft 34. A fastening bolt 86 is screwed into the upper portion of the pressing member 84 through a screw hole 88. The lower portion of the pressing member 84 is in contact with the pressed surface 74 of the cutting tool 36. Thus, the pressing force applied to the upper portion of the pressing member 84 from the fastening bolt 86 can be surely applied to the cutting tool 36 at the lower portion of the pressing member 84. Therefore, the cutting tool 36 is biased toward the screw portion 66 by the pressing member 84, and the main body portion 62 is biased toward the inner peripheral surface 441 of the insertion hole 44 and pressed against the inner peripheral surface 441 to be fixed.

[0088] When viewed from the axial direction of the tool shaft 34, the fastening bolt 86 and the cutting tool 36 are arranged to intersect. As a result, when the fastening bolt 86 is rotated to move the pressing member 84 toward the cutting tool 36, a pressing force can be applied to the cutting tool 36 from the pressing member 84 in an oblique direction with respect to the central axis of the cutting tool 36. Therefore, the cutting tool 36 can be reliably pressed against the inner peripheral surface 441 of the insertion hole 44 by the pressing member 84, and rattling during machining of the workpiece W can be suppressed.

[0089] For example, a cutting tool 120 according to a first modification shown in FIG. 7 may be employed. The cutting tool 120 has a cutting tool 122. The cutting tool 122 includes first and second grinding relief portions 124 and 126. The first grinding relief portion 124 is arranged to be spaced apart from the cutting edge portion 64 toward the threaded portion 66. The second grinding relief portion 126 is arranged to be further spaced apart from the first grinding relief portion 124 toward the threaded portion 66.

[0090] The first and second grinding relief portions 124 and 126 are each formed in a shape notched from the tip of the cutting tool 122 toward the main body portion 62. The first grinding relief portion 124 is adjacent to the cutting edge portion 64 and close to the central axis of the cutting tool 122. The second grinding relief portion 126 is arranged closer to the outer peripheral surface of the cutting tool 122 than the first grinding relief portion 124.

[0091] When the cutting tool 122 is inserted into the insertion hole 44 of the tool shaft 34, the first and second grinding relief portions 124 and 126 are arranged in the rotational direction of the tool shaft 34 (arrow A direction) with respect to the cutting edge portion 64. The first grinding relief portion 124 and the second grinding relief portion 126 are formed in a stepped shape.

[0092] The first grinding relief portion 124 includes a first pressed surface 128. The second grinding relief portion 126 includes a second pressed surface 130. The first pressed surface 128 and the second pressed surface 130 are substantially parallel. When the cutting tool 122 is inserted into the insertion hole 44 of the tool shaft 34, the first and second pressed surfaces 128, 130 are perpendicular to the central axis of the bolt hole 46 respectively. The inclination angles of the first and second pressed surfaces 128, 130 with respect to the central axis of the cutting tool 122 are the same as the inclination angle of the holding surface 60 of the recess 48 with respect to the central axis of the insertion hole 44 (see Fig. 7).

[0093] A locking surface 132 is provided between the first pressed surface 128 and the second pressed surface 130. When viewed from the axial direction of the tool shaft 34, the locking surface 132 is substantially parallel to the central axis of the cutting tool 122. The locking surface 132 connects the outer edge of the first pressed surface 128 and the inner edge of the second pressed surface 130.

[0094] When viewed from the axial direction of the tool shaft 34, when a line segment passing through the cutting edge 72 and parallel to the central axis of the cutting tool 122 is defined as the virtual line L, the second pressed surface 130 is disposed at a position separated from the cutting edge 72 with respect to the virtual line L. A pressing member 84 housed in the recess 48 abuts against the second pressed surface 130 of the second grinding relief portion 126. The pressing member 84 abuts against the locking surface 132.

[0095] In this cutting tool 120, when the pressing member 84 is brought into contact with the second grinding relief portion 126 to hold the cutting tool 122, by contacting the second pressed surface 130, the cutting tool 122 can be biased toward the threaded portion 66 and also biased toward the inner peripheral surface 441 of the insertion hole 44 and fixed. By the pressing member 84 abutting against the locking surface 132, movement of the cutting tool 122 in the rotational direction (arrow A direction) can be suppressed. Thereby, by holding the second pressed surface 130 and the locking surface 132 of the cutting tool 122 by the pressing member 84, vibration of the cutting tool 122 when machining the workpiece W with the cutting tool 122 can be more reliably suppressed.

[0096] When viewed from the axial direction of the tool shaft 34, when a line segment passing through the cutting edge 72 and parallel to the central axis of the cutting tool 122 is defined as the virtual line L, the pressing member 84 is arranged at a position separated from the cutting edge 72 with respect to the virtual line L. Therefore, when the cutting tool 122 is withdrawn from the insertion hole 44 in the direction of the second hole portion 52, the pressing member 84 and the cutting edge 72 do not come into contact. Therefore, when the cutting tool 122 is exchanged from the tool shaft 34, the cutting tool 122 can be exchanged without removing the pressing member 84.

[0097] The cutting tool 140 according to the second modification shown in FIG. 8 may be employed. The cutting tool 140 has a pair of fastening bolts 861, 862. The fastening bolts 861, 862 are arranged at intervals in the axial direction of the tool shaft 34.

[0098] The fastening bolt 861 is arranged at a distance above the cutting tool 36. The fastening bolt 862 is arranged at a distance below the cutting tool 36. That is, the fastening bolts 861, 862 are arranged so as to sandwich the cutting tool 36 in the axial direction of the tool shaft 34. When viewed from the axial direction of the tool shaft 34, the fastening bolts 861, 862 overlap.

[0099] The fastening bolts 861, 862 are respectively inserted into the bolt holes 46 of the tool shaft 34.

[0100] The shaft portions 92 of the fastening bolts 861, 862 are respectively screwed into the screw holes 881, 882 of the pressing member 142. The pressing member 142 is housed in the recess 481 of the tool shaft 34. The central portion of the pressing member 142 abuts against the pressed surface 74 of the grinding relief portion 68 of the cutting tool 36. Thereby, the pressing force applied to the upper and lower portions of the pressing member 142 from the fastening bolts 861, 862 can be more reliably applied toward the cutting tool 36 at the central portion of the pressing member 142 as compared with the case where the pressing is performed by a single fastening bolt 86.

[0101] Therefore, the cutting tool 36 can be biased toward the threaded portion 66 through the pressing member 142 pressed by a set of fastening bolts 861 and 862, and the main body portion 62 can be biased toward the inner peripheral surface 441 of the insertion hole 44 and pressed against the inner peripheral surface 441 to be fixed more reliably.

[0102] Summarizing the above embodiments, it is as follows.

[0103] The above embodiment is a cutting tool (18) used for a cutting machine (10) for machining a workpiece (W), a shaft (34) that is rotationally driven by a drive mechanism (16), a cutting tool (36) having a tip portion formed with a cutting edge portion (64) and a base end portion on the side opposite to the tip portion, inserted into an insertion hole (44) provided on the shaft so as to extend in a direction intersecting the axial direction of the shaft, movable in the hole axial direction of the insertion hole, and having the cutting edge portion disposed to protrude radially outward from the outer peripheral surface of the shaft, a position adjusting mechanism (38) attached to the shaft and capable of adjusting the position of the cutting tool in the hole axial direction with respect to the shaft, a pressing mechanism (40) attached to the shaft and pressing a pressed portion (68) disposed between the cutting edge portion and the base end portion of the cutting tool, thereby biasing the cutting tool toward the base end portion and biasing the cutting tool toward the inner surface of the insertion hole, and comprising.

[0104] The pressed portion is a stepped portion in which a part of the cutting tool is cut out, the stepped portion has an inclined surface (74) disposed inclined with respect to the central axis of the cutting tool in the rotational direction of the shaft with respect to the cutting edge portion, the pressing mechanism abuts against the inclined surface.

[0105] The pressing mechanism includes a pressing member (84) that presses the pressed portion of the cutting tool, a fastening bolt (86) inserted through the shaft and screwed into the pressing member to bias the pressing member toward the shaft and the cutting tool. comprises.

[0106] The pressing mechanism includes a pressing member disposed substantially parallel to the inclined surface of the pressed portion and pressing the inclined surface, a fastening bolt inserted through the shaft and screwed into the pressing member to bias the pressing member toward the shaft and the cutting tool, and comprises.

[0107] When viewed from the axial direction of the shaft, it is parallel to the central axis of the cutting tool, and the pressing member is arranged in a direction away from the cutting edge portion with respect to a line segment (L) passing through the cutting edge (72) of the cutting edge portion.

[0108] The position adjusting mechanism includes an adjustment member (76) having a male screw portion (78) screwed onto the inner surface of the insertion hole and a female screw portion (80) screwed onto the cutting tool, the adjustment member is rotatably disposed inside the insertion hole, and the screw pitch of the female screw portion is smaller than the screw pitch of the male screw portion.

[0109] The pressing member is arranged along the axial direction of the shaft, one end of the pressing member along the axial direction has the fastening bolt screwed thereon, and the other end of the pressing member along the axial direction abuts against the cutting tool.

[0110] When viewed from the axial direction of the shaft, the fastening bolt and the cutting tool intersect.

[0111] A set of the fastening bolts is provided with the cutting tool interposed therebetween in the axial direction of the shaft.

[0112] The pressed portion includes a first pressed surface close to the cutting edge portion, a second pressed surface disposed closer to the base end portion than the first pressed surface and radially outward of the cutting tool with respect to the first pressed surface, and comprises, and the second pressed surface is pressed by the pressing mechanism.

[0113] Note that the present invention is not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

Explanation of Reference Numerals

[0114] 10... machining tool 16... drive mechanism 18, 120, 140... cutting tools 34... tool shaft 36, 122... cutting blades 38... position adjustment mechanism 40... pressing mechanism 44... insertion hole 46... bolt hole 64... cutting edge portion 66... threaded portion 68... grinding relief portion 76... adjustment member 84, 142... pressing members 86, 861, 862... fastening bolts 132... locking surface

Claims

1. A cutting tool (18) used in a cutting machine (10) for machining a workpiece (W), a shaft (34) that is rotationally driven by a drive mechanism (16), a tool (36) having a tip portion where a cutting edge portion (64) is formed and a base end portion opposite to the tip portion, and being inserted into an insertion hole (44) provided in the shaft so as to extend in a direction intersecting the axial direction of the shaft, being movable in the axial direction of the insertion hole, and having the cutting edge portion disposed to project radially outward from the outer peripheral surface of the shaft, a position adjustment mechanism (38) attached to the shaft and capable of adjusting the position of the tool in the axial direction of the shaft with respect to the shaft, a pressing mechanism (40) attached to the shaft and pressing a pressed portion (68) disposed between the cutting edge portion and the base end portion of the tool, thereby biasing the tool toward the base end portion and biasing the tool toward the inner surface of the insertion hole, comprising: the pressing mechanism includes a pressing member (84) that presses the pressed portion of the tool, a fastening bolt (86) that is inserted through the shaft and screwed into the pressing member, and biases the pressing member toward the shaft and the tool, comprising: a cutting tool, as viewed from the axial direction of the shaft, being parallel to the central axis of the tool and having the pressing member disposed in a direction away from the cutting edge portion with respect to a line segment (L) passing through the cutting edge (72) of the cutting edge portion.

2. The cutting tool according to claim 1, wherein the pressed portion is a stepped portion in which a part of the tool is cut out, the stepped portion has an inclined surface (74) disposed to be inclined with respect to the central axis of the tool in the rotational direction of the shaft with respect to the cutting edge portion, and the pressing mechanism abuts against the inclined surface.

3. (Deleted)

4. (Deleted)

5. (Deleted)

6. The cutting tool according to claim 1 or 2, wherein the position adjustment mechanism includes an adjustment member (76) having a male screw portion (78) screwed into the inner surface of the insertion hole and a female screw portion (80) screwed into the tool, the adjustment member is rotatably disposed inside the insertion hole, and the pitch of the female screw portion is smaller than the pitch of the male screw portion.

7. The cutting tool according to claim 1, wherein the pressing member is disposed along the axial direction of the shaft. At one end of the pressing member along the axial direction, it is screwed to the fastening bolt, and the other end of the pressing member along the axial direction abuts against the cutting tool, which is a cutting tool.

8. In the cutting tool according to claim 1 or 7, A cutting tool in which the fastening bolt and the cutting tool intersect when viewed from the axial direction of the shaft.

9. In the cutting tool according to claim 1, The fastening bolts are provided in a pair with the cutting tool interposed therebetween in the axial direction of the shaft, which is a cutting tool.

10. In the cutting tool according to claim 1, The pressed portion includes a first pressed surface close to the cutting edge portion and a second pressed surface disposed closer to the base end portion than the first pressed surface and disposed radially outward of the cutting tool with respect to the first pressed surface, and the second pressed surface is pressed by the pressing mechanism, which is a cutting tool.

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