Cutting tool

Abstract

A cutting tool (18) has a tool shaft (34), a cutting insert (36), a position adjustment mechanism (38), and a pressing mechanism (40). The cutting insert (36) is movably arranged in an insertion hole (44) of the tool shaft (34). The position adjustment mechanism (38) is capable of adjusting the position of the cutting insert (36) relative to the tool shaft (34). The pressing mechanism (40) is mounted to the tool shaft (34). The pressing mechanism (40) presses an abutment portion (68) of the cutting insert (36). The pressing mechanism (40) exerts a force on the cutting insert (36) toward a base end. The pressing mechanism (40) exerts a force on the cutting insert (36) toward an inner peripheral surface (441) of the insertion hole (44).

Description

Technical Field

[0001] This invention relates to a cutting tool for a cutting machine used for machining workpieces. Background Technology

[0002] The cutting machine disclosed in Japanese Patent Publication No. 2007-253305 has a rotatable tool body. The outer periphery of the tool body has multiple mounting seats along the rotation direction of the tool body. An insert and a clamping member are mounted on the mounting seats. The insert is movable along a first mounting surface and a second mounting surface of the mounting seats. The insert has a cutting edge at its tip. The tip of an adjusting screw screwed onto the mounting seat can abut against the rear end of the insert. The adjusting screw is angled relative to the insert.

[0003] The clamping component is fixed to the tool body radially from the outside by a retaining screw. The blade is clamped and fixed in the mounting base by the clamping component.

[0004] When adjusting the position of the cutting edge, after loosening the retaining screw to tilt the clamping component, tighten the adjusting screw to press down the rear end of the insert. This causes the insert to move radially outward along the first and second mounting surfaces towards the tool body. The position of the cutting edge is adjusted as the insert moves. Then, the insert is secured to the tool body by tightening the retaining screw again. Summary of the Invention

[0005] The tool body rotates to cut the workpiece through the cutting edge of the insert. At this time, the workpiece contacts the cutting edge of the insert, and the workpiece exerts a reaction force on the insert. Due to the frictional torque generated when the fixing screw is tightened for the last time, the posture of the clamping component and the insert sometimes changes. Accordingly, when the tip of the insert lifts, the reaction force during machining presses the insert away from the first or second mounting surface, causing it to move. Because the insert moves from its intended position, there is a problem of decreased machining accuracy of the cutting edge on the workpiece. When adjusting the position of the cutting edge, after loosening the fixing screw and tilting the clamping component, it is necessary to turn the adjusting screw.

[0006] In addition, the blade sometimes cannot be retracted when the adjusting screw is moved back. Therefore, two fixing screws and an adjusting screw are required to make precise rotational adjustments without retraction, which is a complicated adjustment operation.

[0007] The purpose of this invention is to solve the above-mentioned technical problems.

[0008] The present invention relates to a cutting tool, a cutting machine for machining workpieces. The cutting tool has a shaft, a cutting tool, a position adjustment mechanism, and a pressing mechanism, wherein... The shaft is driven to rotate by a drive mechanism; The cutting tool has a top end portion with a cutting edge and a base end portion located on the side opposite to the top end portion. The cutting tool is inserted into an insertion hole of the shaft that extends in a direction intersecting the axial direction of the shaft and is movable in the direction of the hole axis of the insertion hole. The cutting edge portion is configured to protrude radially outward from the outer peripheral surface of the shaft. The position adjustment mechanism is mounted on the shaft and can adjust the position of the cutting tool relative to the shaft in the direction of the hole axis. The pressing mechanism is mounted on the shaft and applies force to the cutting tool toward the base end by pressing the pressed part, and applies force to the inner surface of the insertion hole, wherein the pressed part is disposed between the cutting edge of the cutting tool and the base end.

[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, the reaction force from the workpiece is applied to the cutting edge of the cutting tool. At this time, the pressed part of the cutting tool is pressed by the pressing mechanism, and the cutting tool is forced towards its base end and towards the inner surface of the insertion hole. Accordingly, the cutting tool is firmly fixed to the shaft. Therefore, when the reaction force from the workpiece is applied to the cutting edge of the cutting tool, it is possible to prevent the cutting tool from wobbling relative to the shaft. The protrusion of the cutting edge of the cutting tool can be easily and precisely adjusted radially outward or radially inward by the position adjustment mechanism. After the position of the cutting edge is adjusted, there is no need to tighten the fixing screws as in the prior art, thus preventing any change in the posture of the cutting tool.

[0011] As a result, workpieces can be machined with high precision using cutting tools. By using the ground retraction surface of the cutting edge as the pressing part, and applying a preload to the pressing part through the pressing mechanism to exert force on the cutting tool towards the base end, manufacturing costs can be reduced compared to the case where a new pressing mechanism is formed to press the part. Attached Figure Description

[0012] Figure 1 This is a perspective view of a cutting machine using the cutting tools described in the embodiments of the present invention. Figure 2 yes Figure 1 Enlarged 3D view of the main parts of a cutting machine. Figure 3 It means Figure 2 A magnified front view of the area near the cutting tool in a cutting machine. Figure 4It is along Figure 3 Sectional view of IV-IV. Figure 5 It is along Figure 3 A cross-sectional view of VV. Figure 6 yes Figure 4 An enlarged sectional view near the adjustment component. Figure 7 This is a cross-sectional view showing the cutting tool involved in the first variation. Figure 8 This is an enlarged front view of the cutting tool involved in the second variation. Detailed Implementation

[0013] The cutting machine 10 is used to machine holes in workpiece W. Workpiece W is a cylinder of an internal combustion engine mounted in a vehicle. For example... Figure 1 and Figure 2 As shown, the cutting machine 10 has a base 12, a main frame 14, a drive mechanism 16, a cutting tool 18, and a conveying mechanism 20.

[0014] The base 12 is positioned at the lower part of the cutting machine 10. The base 12 is placed on the ground or the like.

[0015] The main frame 14 is erected upwards from the base 12. The main frame 14 has a guide rail 22. The guide rail 22 is disposed on the outer peripheral surface of the main frame 14. The guide rail 22 extends along the axial direction of the main frame 14.

[0016] The drive mechanism 16 is configured on the upper part of the main frame 14. The drive mechanism 16 has a lifting platform 24 and a drive motor 26. The lifting platform 24 is movable vertically along the guide rail 22 of the main frame 14. The drive motor 26 is fixed to the upper part of the lifting platform 24. The drive motor 26 has a drive shaft (not shown). The drive shaft extends downward through the lifting platform 24. The rotating shaft 30 of the 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 configured on the outer periphery of the main frame 14. Each tool head 28 is held in place by a head support 32. The four tool heads 28 are evenly spaced apart in the circumferential direction of the head support 32.

[0018] Each tool head 28 has a rotating shaft 30. The rotating shaft 30 is rotatably supported on 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 the 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] like Figures 3-6 As shown, the cutting tool 18 has a tool axis 34 (axis), a cutting tool 36, a position adjustment mechanism 38, and a pressing mechanism 40.

[0020] like Figures 1-5 As shown, the tool shaft 34 is detachably disposed on the tool head 28. The tool shaft 34 is an elongated shaft 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 fixture 94 described later. In this embodiment, the tool shaft 34 is a boring bar.

[0021] The tool shaft 34 has multiple receiving portions 42. The multiple receiving portions 42 are spaced approximately equally from each other along the axial direction of the tool shaft 34. The multiple receiving portions 42 can accommodate the cutting tool 36, the position adjustment mechanism 38, and the pressing mechanism 40.

[0022] The receiving part 42 has an insertion hole 44, a bolt hole 46 and a recess 48.

[0023] The axial direction (direction of the hole axis) of the insertion hole 44 intersects the axial direction of the tool shaft 34. In this embodiment, the insertion hole 44 extends through in a direction orthogonal to the axial direction of the tool shaft 34. The axial direction of the insertion hole 44 may also be inclined relative to the axial direction of the tool shaft 34. The insertion hole 44 is straight. The central axis of the insertion hole 44 passes through the axis P of the tool shaft 34 (refer to...). Figure 4 The insertion hole 44 has a first hole portion 50 and a second hole portion 52. The cutting tool 36 of the cutting tool 18, which will be described later, is inserted into the insertion hole 44.

[0024] The first hole 50 is disposed at one end of the insertion hole 44 from the center along the extension direction of the insertion hole 44. The first hole 50 has a constant diameter along the axial direction of the insertion hole 44. The first hole 50 is open on the outer peripheral surface of the tool shaft 34.

[0025] The second hole 52 is positioned from the center of the insertion hole 44 along its extension direction toward the other end of the insertion hole 44. Near the center along the axial direction of the insertion hole 44, the second hole 52 connects with the first hole 50. The diameter of the second hole 52 is larger than the diameter of the first hole 50. The second hole 52 opens on the outer circumferential surface of the tool shaft 34. An inner circumferential thread 54 is present on the inner circumferential surface of the second hole 52. The adjusting member 76 of the position adjusting mechanism 38, described later, engages with the second hole 52.

[0026] The bolt hole 46 extends through in a direction orthogonal to the axial direction of the tool shaft 34. The bolt hole 46 and the insertion hole 44 are axially separated from each other on the tool shaft 34. In this embodiment, the bolt hole 46 is positioned above the insertion hole 44 (see reference). Figure 3 The central axis of bolt hole 46 passes through axis P of tool shaft 34. A fastening bolt 86 of pressing mechanism 40 (described later) is inserted into bolt hole 46.

[0027] from Figure 4 Viewed axially from the tool shaft 34, the central axis of the bolt hole 46 intersects the central axis of the insertion hole 44 at a predetermined angle. The central axis of the bolt hole 46 and the central axis of the insertion hole 44 intersect at point P on the axis of the tool shaft 34 (see reference). Figure 4 and Figure 5 ).from Figure 4 Viewed axially from the tool shaft 34, the bolt hole 46 is positioned at a predetermined angle relative to the insertion hole 44 in the direction of rotation of the tool shaft 34 (arrow A direction). Figure 4 When viewed axially, the tool shaft 34 rotates clockwise.

[0028] Bolt hole 46 has a small diameter portion 56 and a large diameter portion 58. Bolt hole 46 is in a straight line.

[0029] A minor diameter portion 56 is provided at one end of the bolt hole 46 along its extending direction. The minor diameter portion 56 opens on the outer circumferential surface of the tool shaft 34. The minor diameter portion 56 has a constant diameter along the extending direction of the bolt hole 46. The minor diameter portion 56 extends from one end of the bolt hole 46 along its extending direction to near the other end. Figure 4 Viewed axially from the tool shaft 34, the minor diameter portion 56 opens relative to the first hole portion 50 of the insertion hole 44 at a position toward the rotational direction of the tool shaft 34 (arrow A direction).

[0030] The larger diameter portion 58 is disposed at the other end of the bolt hole 46 along its extending direction. The diameter of the larger diameter portion 58 is larger than the diameter of the smaller diameter portion 56. The larger diameter portion 58 opens on the outer circumferential surface of the tool shaft 34. The larger diameter portion 58 and the smaller diameter portion 56 are connected near the other end of the bolt hole 46. Figure 4 Viewed axially from the tool shaft 34, the large diameter portion 58 opens relative to the second hole portion 52 of the insertion hole 44 at a position toward the rotational direction of the tool shaft 34 (arrow A direction).

[0031] The recess 48 is recessed radially inward from the outer circumferential surface of the tool shaft 34. Figure 4 and Figure 5Viewed axially from the tool shaft 34, the cross-sectional shape of the recess 48 is approximately rectangular. The recess 48 is elongated 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 configured 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 retaining surface 60. The retaining surface 60 is a surface that moves radially inward from the outer periphery of the tool shaft 34. The retaining surface 60 extends axially along the tool shaft 34. At the upper part of the recess 48, the small-diameter portion 56 of the bolt hole 46 opens at the center of the retaining surface 60. The central axis of the bolt hole 46 is orthogonal to the retaining surface 60 (see reference). Figure 5 ).

[0033] At the lower part of the recess 48, a portion of the first hole 50 opens into the retaining surface 60. The recess 48 is offset in the circumferential direction of the tool shaft 34 relative to the central axis of the first hole 50. The recess 48 is also offset in the direction of rotation (arrow A) of the tool shaft 34 relative to the central axis of the first hole 50. The recess 48 communicates with the insertion hole 44.

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

[0035] The cutting edge 64 is disposed at the axially oriented tip of the main body 62. The cutting edge 64 protrudes in a direction away from the main body 62. The cutting edge 64 protrudes radially outward from the outer peripheral surface of the tool shaft 34.

[0036] The cutting edge 64 has a cutting retraction surface 70 and a tool tip 72. The cutting retraction surface 70 is inclined from the outer peripheral surface of the main body 62 toward the central axis of the cutting tool 36. Figure 4 Viewed axially from the tool axis 34, the cutting retreat surface 70 extends from the outer peripheral surface of the main body 62 to a plane that crosses the central axis of the cutting tool 36.

[0037] A cutting tip 72 is provided at the top of the cutting retreat surface 70. The cutting tip 72 is oriented in an inclination direction at a predetermined angle relative to the central axis of the cutting tool 36. Figure 4Viewed axially from the tool shaft 34, the tool tip 72 is an acute angle. When the cutting tool 36 is mounted on the tool shaft 34, the tool tip 72 is positioned closer to the rotation direction (arrow A) of the tool shaft 34 than the central axis of the cutting tool 36. The tool tip 72 protrudes further into the rotation direction (arrow A) of the tool shaft 34 than the central axis of the cutting tool 36.

[0038] By rotating the tool shaft 34, the cutting edge 64 of the cutting tool 36 is used to machine the lower hole H (refer to) of the workpiece W. Figure 2 The inner circumferential surface of the ) is machined by cutting.

[0039] A threaded portion 66 is disposed at the base end of the body portion 62 along the axial direction of the body portion 62. The threaded portion 66 extends in a direction away from the base end of the body portion 62. The threaded portion 66 has external threads. The threaded portion 66 is received in the second hole portion 52 of the insertion hole 44.

[0040] A grinding retraction portion 68 is positioned between the cutting edge portion 64 and the threaded portion 66, and adjacent to the cutting edge portion 64. The grinding retraction portion 68 has a notch shape formed from the tip of the cutting tool 36 toward the body portion 62. Figure 4 When viewed axially from the tool shaft 34, the grinding retraction portion 68 is positioned in the opposite direction (arrow A) to the cutting edge portion 64 relative to the central axis of the main body portion 62. The grinding retraction portion 68 has a pressing surface (inclined surface) 74. The pressing surface 74 is inclined relative to the central axis of the cutting tool 36. The pressing surface 74 is the grinding retraction 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 relative to the central axis of the cutting tool 36 is the same as the inclination angle of the retaining surface 60 of the recess 48 relative to the central axis of the insertion hole 44 (see reference). Figure 4 When the cutting tool 36 is inserted into the insertion hole 44 of the tool spindle 34, the grinding retreat portion 68 is positioned relative to the cutting edge portion 64 in the rotation direction (arrow A direction) of the tool spindle 34.

[0042] The position adjustment mechanism 38 is disposed in the second hole portion 52 of the insertion hole 44. The position adjustment mechanism 38 has an adjustment member 76. The adjustment member 76 is cylindrical. The adjustment member 76 has an external thread portion 78, an internal thread portion 80, and an adjustment hole portion 82.

[0043] An external thread portion 78 is disposed on the outer peripheral surface of the adjusting member 76. The pitch of the external thread portion 78 is a first pitch. The external thread portion 78 engages with the inner peripheral thread portion 54 of the second hole portion 52. The pitches of the external thread portion 78 and the inner peripheral thread portion 54 are the same first pitch.

[0044] An internal thread portion 80 is disposed on the inner circumferential surface of the adjusting member 76. The internal thread portion 80 extends axially along the adjusting member 76. The pitch of the internal thread portion 80 is the second pitch. The threaded portion 66 of the cutting tool 36 is screwed into the internal thread portion 80. The pitches of the internal thread portion 80 and the threaded portion 66 are the same second pitch. The second pitch of the internal thread portion 80 is smaller than the first pitch of the external thread portion 78. The threaded portion 66 of the cutting tool 36 is fixed to the second hole portion 52 of the insertion hole 44 by the adjusting member 76.

[0045] An adjustment hole 82 is disposed at the base end of the adjustment member 76 and is open. The adjustment hole 82 passes through the internal thread 80. Viewed axially from the adjustment member 76, the adjustment hole 82 is hexagonal in shape. By inserting an adjustment tool (not shown) with a hexagonal tip into the adjustment hole 82, 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 52. By rotating the adjustment member 76, the cutting tool 36, which engages with the thread 66, can move together with the adjustment member 76 along the central axis of the insertion hole 44. That is, by means of the adjustment member 76, the cutting tool 36 is held so that it can move axially along the insertion hole 44.

[0046] At this time, the second pitch of the internal thread portion 80 that engages with the threaded portion 66 of the cutting tool 36 is less than the first pitch of the internal circumferential thread portion 54 that engages with the adjusting member 76. Therefore, when the adjusting member 76 advances axially along the internal circumferential thread portion 54 at the first pitch, the cutting tool 36 retracts axially along the internal thread portion 80 of the adjusting member 76 at the second pitch. That is, the cutting tool 36 advances axially by the difference between the first pitch and the second pitch.

[0047] The pressing mechanism 40 has a pressing component 84 and a fastening bolt 86.

[0048] The pressing member 84 is a resilient sheet metal (leaf spring). The pressing member 84 is rectangular in shape, corresponding to the recess 48 of the tool shaft 34. The pressing member 84 is received within the recess 48. The pressing member 84 is fitted into the recess 48 in its width direction. Accordingly, the pressing member 84 is positioned within the recess 48. The pressing member 84 abuts against the retaining surface 60 of the recess 48. The pressing member 84 does not protrude from the outer peripheral surface of the tool shaft 34 (see reference). Figure 4 and Figure 5 The pressing member 84 has a threaded hole 88 on its upper part. In the recess 48, the threaded hole 88 faces the small diameter portion 56 of the bolt hole 46. A fastening bolt 86, which is inserted into the bolt hole 46, is screwed into the threaded 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 retraction portion 68 of the cutting tool 36 (see reference). Figure 4 ).

[0050] from Figure 4 Viewed axially from the tool axis 34, when an imaginary line L is taken as the line segment parallel to the central axis of the cutting tool 36 and passing through the tool tip 72, the pressing member 84 is preferably positioned separate from the tool tip 72 relative to the imaginary line L. Therefore, when the cutting tool 36 needs to be replaced due to chipping or other reasons at the tool tip 72, it is not necessary to disassemble the pressing member 84. That is, the cutting tool 36 can be replaced while the pressing member 84 is installed.

[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 protrudes to the outside through the large-diameter portion 58. The diameter of the shaft portion 92 is smaller than the diameter of the head 90. The shaft portion 92 is connected to the head 90 and extends axially. The shaft portion 92 is inserted into the small-diameter portion 56 of the bolt hole 46. The outer peripheral surface of the shaft portion 92 has threads. The tip of the shaft portion 92 engages with the threaded hole 88 of the pressing member 84 in the recess 48.

[0052] The head 90 of the fastening bolt 86 is rotatable from outside the tool shaft 34. When the fastening bolt 86 is rotated, the pressing member 84, which engages with the shaft portion 92, moves toward the retaining surface 60 in the recess 48. As the pressing member 84 moves toward the retaining surface 60, it presses the pressed surface 74 of the cutting tool 36. 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 against the base end by the pressing member 84, and the base end of the cutting tool 36 is held in a movable manner on the tool shaft 34 by the adjusting member 76.

[0054] like Figure 1 and Figure 2 As shown, the main frame 14 has four clamps 94. The clamps 94 are capable of holding the workpiece W. Each clamp 94 is held in a rotatable manner by a support bracket. When the support bracket rotates, one of the four clamps 94 is held against the support block 96.

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

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

[0057] like Figure 1 As shown, the conveying mechanism 20 is disposed on the upper part of the base 12. The conveying mechanism 20 is disposed radially outward of the main frame 14. The conveying mechanism 20 has a moving stage 104, a cylinder 106, a workpiece holder 108, a tray 110, and a tray holding part 112. The moving stage 104 is movable along the base 12. The cylinder 106 applies force to the moving stage 104 in a direction approaching or away from the main frame 14. The workpiece holder 108 is held on the moving stage 104. The tray holding part 112 is mounted at the end of the workpiece holder 108. The tray holding part 112 is able to hold the workpiece W via the tray 110.

[0058] Next, the position of the cutting tool 36 of the cutting tool 18 relative to the tool axis 34 will be explained.

[0059] First, when the protrusion T of the cutting edge 64 of the cutting tool 36 relative to the outer peripheral surface of the tool shaft 34 is increased (refer to...) Figure 4 When adjusting, the operator inserts an adjustment tool (not shown) into the adjustment hole 82 of the adjustment component 76. The adjustment component 76 is rotated by rotating the adjustment tool in a specified direction.

[0060] By rotating the adjusting component 76, the adjusting component 76 moves along the central axis of the second hole 52 toward the first hole 50. At this time, the amount of movement of the adjusting component 76 becomes the amount of movement corresponding to the pitch of the external thread 78 and the internal thread 54, i.e., the first pitch.

[0061] Since the rotation of the cutting tool 36 within the insertion hole 44 is prevented by the pressing member 84 at a predetermined angle, the cutting tool 36 will not rotate even if the adjusting member 76 rotates. Therefore, as the adjusting member 76 rotates, the threaded portion 66 of the cutting tool 36 and the adjusting member 76 rotate relative to each other. The threaded portion 66 rotates relative to the adjusting member 76, thereby causing the adjusting member 76 and the cutting tool 36 to move axially relative to each other in the direction in which the main body portion 62 of the adjusting member 76 and the cutting tool 36 approach each other (the direction in which the threaded portion 66 is pulled into the adjusting member 76). At this time, the relative movement of the cutting tool 36 (threaded portion 66) relative to the adjusting member 76 is a movement corresponding to the pitch of the internal thread portion 80 and the threaded portion 66, i.e., the second pitch. Here, the movement of the adjusting member 76 within the insertion hole 44 when the adjusting member 76 rotates by a predetermined angle is defined as D1, and the relative movement of the adjusting member 76 and the cutting tool 36 as the adjusting member 76 rotates is defined as D2. The axial movement D of the cutting tool 36 within the insertion hole 44 is D1-D2.

[0062] Therefore, when the adjusting member 76 is rotated and moved towards the tip of the cutting tool 36, the cutting tool 36 can be moved slightly towards the tip relative to the adjusting 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, under the condition that a preload is applied to the cutting tool 36 by the pressing member 84, the cutting tool 36 can be moved towards the tip without wobbling. Accordingly, by rotating the adjusting member 76, the protrusion T of the cutting edge 64 in the cutting tool 36 can be easily and with high precision.

[0063] At this time, the cutting tool 36 is pressed by the pressing member 84 of the pressing mechanism 40 via the pressing surface 74 of the grinding retraction portion 68 in a direction inclined at a predetermined angle to the central axis of the cutting tool 36. The main body 62 of the cutting tool 36 is subjected to force on the inner circumferential surface 441 of the first hole portion 50, which is a surface in the opposite direction (arrow B direction) to the rotation direction of the tool shaft 34 relative to the central axis of the cutting tool 36. The outer circumferential surface of the main body 62 contacts the inner circumferential surface 441 and is pressed into the first hole portion 50.

[0064] Thus, by rotating the adjusting member 76 of the position adjusting mechanism 38, the cutting tool 36 can advance along the central axis of the insertion hole 44, thereby increasing the protrusion T of the cutting edge 64 from the outer peripheral surface of the tool shaft 34. After the position of the cutting edge 64 is adjusted, the cutting tool 36 is firmly pressed and fixed to the inner peripheral surface 441 of the insertion hole 44 by the pressing member 84.

[0065] Next, when reducing the protrusion T of the cutting edge 64 of the cutting tool 36 relative to the outer circumferential surface of the tool shaft 34, the operator rotates the adjusting member 76 in the opposite direction using a tool (not shown). Accordingly, the adjusting member 76 rotates and moves along the central axis of the second hole 52 away from the first hole 50. At this time, the amount of movement of the adjusting member 76 corresponds to the pitch of the external thread 78 and the internal thread 54, i.e., the first pitch.

[0066] As the adjusting member 76 rotates, the threaded portion 66 of the cutting tool 36 rotates relative to the adjusting member 76. This rotation of the threaded portion 66 relative to the adjusting member 76 causes a relative displacement between the adjusting member 76 and the cutting tool 36 along the central axis of the insertion hole 44 in the direction in which the adjusting member 76 separates from the main body 62 of the cutting tool 36. At this time, the amount of movement of the cutting tool 36 (threaded portion 66) becomes the amount of movement corresponding to the pitch of the internal thread portion 80 and the threaded portion 66, i.e., the second pitch. That is, the distance the cutting tool 36 moves is shorter relative to the distance the adjusting member 76 moves.

[0067] Therefore, when the adjusting member 76 is rotated and moved towards the base end of the cutting tool 36, the cutting tool 36 can be moved slightly towards the base end relative to the adjusting member 76. That is, when a preload is applied to the cutting tool 36 by the pressing member 84, the cutting tool 36 can be moved towards the base end without wobbling. Accordingly, by rotating the adjusting member 76, the protrusion T of the cutting edge 64 in the cutting tool 36 can be easily and with high precision adjusted.

[0068] At this time, the cutting tool 36 is pressed by the pressing member 84 of the pressing mechanism 40 via the pressing surface 74 of the grinding retraction portion 68 in a direction inclined at a predetermined angle to the central axis of the cutting tool 36. The main body 62 of the cutting tool 36 is subjected to force on the inner circumferential surface 441 of the first hole portion 50, which is a surface in the opposite direction (arrow B direction) to the rotation direction of the tool shaft 34 relative to the central axis of the cutting tool 36. The outer circumferential surface of the main body 62 contacts the inner circumferential surface 441 and is pressed into the first hole portion 50.

[0069] Thus, 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, thereby reducing the protrusion T of the cutting edge 64 from the outer peripheral surface of the tool shaft 34. After the position of the cutting edge 64 is adjusted, the cutting tool 36 is firmly pressed 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 explained.

[0071] First, with the moving table 104 of the conveying mechanism 20 away from the main frame 14, the workpiece W is held on the pallet 110. The drive cylinder 106 moves the moving table 104 and the workpiece holder 108 together toward the main frame 14. The workpiece W is held by the clamp 94. The support block 96 is fed onto the clamp 94, and the clamp 94 is held by the support block 96.

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

[0073] The workpiece W is slightly moved horizontally by the conveying mechanism 20, aligning the axis center of the machining hole H of the workpiece W with the axis P of the tool shaft 34. The drive motor 26 drives the tool shaft 34 to rotate and further descend. Accordingly, the cutting tools 18 rotate together with the tool shaft 34. The inner circumferential surface of the machining hole H is machined by the cutting edges 64 of the cutting tools 36 among the multiple cutting tools 18. The inner circumferential surface of the machining hole H in the workpiece W is machined to the desired inner circumferential diameter.

[0074] At this time, the pressing surface 74 of the cutting tool 36 is pressed by the pressing member 84, the cutting tool 36 is subjected to force towards its base end, and the main body 62 of the cutting tool 36 is pressed and fixed to the inner circumferential surface 441 of the insertion hole 44. Therefore, when machining the lower hole H of the workpiece W by the cutting tool 36, even if a reaction force from the workpiece W is applied to the cutting edge 64, the wobble of the cutting tool 36 caused by the reaction force can be appropriately suppressed. The lower hole H of the workpiece W is machined with high precision by the cutting tool 36, which is firmly fixed to the tool shaft 34.

[0075] As described above, in the embodiment of the present invention, the cutting tool 18 used in the cutting machine 10 for machining the workpiece W includes a cutting tool 36, a position adjustment mechanism 38, and a pressing mechanism 40. The cutting tool 36 is movably disposed in the insertion hole 44 of the tool shaft 34. The position adjustment mechanism 38 is capable of adjusting the axial position of the cutting tool 36 relative to the tool shaft 34. The pressing mechanism 40 presses the grinding retraction portion 68 of the cutting tool 36. The pressing mechanism 40 applies force to the cutting tool 36 toward its base end. The pressing mechanism 40 applies force to the cutting tool 36 toward the inner circumferential surface 441 of the insertion hole 44.

[0076] The cutting tool 36 is moved along the insertion hole 44 by the position adjustment mechanism 38, thereby adjusting the amount T by which the cutting edge 64 of the cutting tool 36 protrudes radially outward relative to the outer circumferential surface of the tool shaft 34. The pressing surface 74, located near the cutting edge 64, is pressed at a predetermined angle by the generally spring-shaped pressing member 84 in the pressing mechanism 40, thereby pressing the cutting tool 36 from near the cutting edge 64 toward its base end, and pressing the inner circumferential surface 441 of the insertion hole 44 in a direction intersecting the central axis of the cutting tool 36. This securely fixes the cutting tool 36 to the tool shaft 34. The pressing direction of the cutting tool 36 is opposite to the rotation direction of the tool shaft 34 (arrow B direction).

[0077] Even when the cutting tool axis 34 rotates and the workpiece W is machined by the cutting tool 36, the reaction force from the workpiece W is applied to the cutting edge 64 of the cutting tool 36, preventing the cutting tool 36 from wobbling in the insertion hole 44. As a result, when the workpiece W is machined by the cutting tool 18, vibration of the cutting tool 36 caused by 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 diameter of the tool shaft 34 is small, the protrusion T of the cutting edge 64 of the cutting tool 36 can be adjusted with high precision on both the radially outer and radially inner sides by the position adjustment mechanism 38.

[0079] The grinding retraction portion 68 of the cutting tool 36 is a stepped portion where a part of the main body 62 has been cut off. This grinding retraction portion 68 is positioned relative to the cutting edge portion 64 of the cutting tool 36 in the rotation direction of the tool shaft 34, and has a pressing surface 74 inclined relative to the central axis of the cutting tool 36. The pressing member 84 of the pressing mechanism 40 abuts against the pressing surface 74 and presses, thereby pressing the cutting tool 36 in the opposite direction to the rotation direction of the tool shaft 34 (arrow B direction). This presses and fixes the main body 62 of the cutting tool 36 to the inner circumferential surface 441 of the insertion hole 44. Therefore, by using the grinding retraction portion 68 of the cutting tool 36 and pressing the pressing surface 74 of this grinding retraction portion 68 by the pressing member 84, the cutting tool 36 can be reliably fixed to the insertion hole 44 of the tool shaft 34.

[0080] By using the grinding retreat portion 68 (pressed surface 74) in the cutting tool 36 as the pressed portion and configuring it to be able to apply a preload by pressing with the pressing member 84, the manufacturing cost of the cutting tool 18 can be reduced compared to the case where the pressing part of the pressing member 84 is newly provided.

[0081] By pressing the grinding retraction portion 68 near the cutting edge 64 with the pressing member 84, the cutting tool 36 can be firmly fixed to the tool shaft 34, thereby improving the rigidity of the cutting tool 36. This also prevents vibration of the cutting tool 36 when machining the workpiece W.

[0082] The pressing mechanism 40 includes a pressing member 84 and a fastening bolt 86. The pressing member 84 presses against the pressed surface 74 of the grinding retraction portion 68 of the cutting tool 36, and the fastening bolt 86 is inserted into the bolt hole 46 of the tool shaft 34. The shaft portion 92 of the fastening bolt 86 engages with the threaded hole 88 of the pressing member 84. By rotating the fastening bolt 86, force is applied to the pressing member 84 on the tool shaft 34 and the cutting tool 36. The pressing member 84 presses against the pressed surface 74 of the cutting tool 36, thus firmly fixing the cutting tool 36 against the inner circumferential surface 441 of the insertion hole 44. After the cutting tool 36 is positioned on the tool shaft 34, there is no need to rotate the fastening bolt 86; therefore, the orientation of the cutting tool 36 is maintained without changing.

[0083] Viewed axially from the tool spindle 34, the pressing member 84 is positioned away from the cutting edge 64 relative to the imaginary line L, which is parallel to the central axis of the cutting tool 36 and passes through the tip 72 of the cutting edge 64. Therefore, when the cutting tool 36 is removed from the tool spindle 34 and replaced, the tip 72 (cutting edge 64) of the cutting tool 36 does not contact the pressing member 84 when the cutting tool 36 is pulled out from the insertion hole 44 toward the second hole 52. Thus, the replacement of the cutting tool 36 can be performed without removing the pressing member 84. The same applies when installing a new cutting tool 36 onto the tool spindle 34.

[0084] That is, when changing the cutting tool 36, the replacement operation can be easily carried out without removing the pressing part 84.

[0085] The position adjustment mechanism 38 includes an adjustment member 76. The adjustment member 76 has an external threaded portion 78 that engages with the inner circumferential surface 441 of the insertion hole 44 of the tool shaft 34, and an internal threaded portion 80 that engages with the threaded portion 66 of the cutting tool 36. The adjustment member 76 is rotatably disposed in the second hole portion 52 of the insertion hole 44. The pitch of the internal threaded portion 80 is smaller than the pitch of the external threaded portion 78. Accordingly, by rotating the adjustment member 76, the cutting tool 36 engaged with the adjustment member 76 can be moved axially, thereby adjusting the amount T of protrusion of the cutting edge portion 64 relative to the outer circumferential surface of the tool shaft 34. As described above, the pitch of the internal threaded portion 80 is smaller than the pitch of the external threaded portion 78. Therefore, when the adjustment member 76 is rotated, the cutting tool 36 can be moved slightly axially.

[0086] As a result, the protrusion amount T of the cutting tool 36 relative to the outer peripheral surface of the tool shaft 34 can be adjusted with high precision. In existing cutting tools, two adjusting screws and a fixing screw are used for adjustment. In contrast, in this invention, the protrusion amount T of the cutting tool 36 can be adjusted by rotating the adjusting member 76. Therefore, the time spent adjusting the protrusion amount T of the cutting tool 36 can be reduced.

[0087] The pressing member 84 is arranged axially along the tool shaft 34. The fastening bolt 86 is screwed onto the upper part of the pressing member 84 via the threaded hole 88. The lower part of the pressing member 84 abuts against the pressed surface 74 of the cutting tool 36. Accordingly, the pressing force applied from the fastening bolt 86 to the upper part of the pressing member 84 can be reliably applied to the cutting tool 36 from the lower part of the pressing member 84. Therefore, the cutting tool 36 can be pressed and fixed to the inner circumferential surface 441 by applying force to the threaded portion 66 by the pressing member 84 and by applying force to the inner circumferential surface 441 of the insertion hole 44 by the main body portion 62.

[0088] Viewed axially from the tool shaft 34, the fastening bolt 86 and the cutting tool 36 are arranged in a cross configuration. Accordingly, 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 by the pressing member 84 from a direction inclined relative to the central axis of the cutting tool 36. Therefore, by reliably pressing the cutting tool 36 against the inner circumferential surface 441 of the insertion hole 44 by the pressing member 84, wobble during workpiece W machining can be suppressed.

[0089] For example, it can also be used Figure 7 The first modified example shown pertains to a cutting tool 120. The cutting tool 120 has a cutting cutter 122. The cutting cutter 122 has a first grinding retraction portion 124 and a second grinding retraction portion 126. The first grinding retraction portion 124 is separately disposed from the cutting edge portion 64 toward the threaded portion 66. The second grinding retraction portion 126 is further separately disposed from the first grinding retraction portion 124 toward the threaded portion 66.

[0090] The first grinding retraction portion 124 and the second grinding retraction portion 126 are respectively shaped to form notches from the tip of the cutting tool 122 toward the main body portion 62. The first grinding retraction portion 124 is adjacent to the cutting edge portion 64 and close to the central axis of the cutting tool 122. The second grinding retraction portion 126 is closer to the outer peripheral surface of the cutting tool 122 than the first grinding retraction portion 124.

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

[0092] The first grinding retraction portion 124 has a first pressing surface 128. The second grinding retraction portion 126 has a second pressing surface 130. The first pressing surface 128 and the second pressing surface 130 are substantially parallel. When the cutting tool 122 is inserted into the insertion hole 44 of the tool shaft 34, the first pressing surface 128 and the second pressing surface 130 are orthogonal to the central axis of the bolt hole 46. The inclination angle of the first pressing surface 128 and the second pressing surface 130 relative to the central axis of the cutting tool 122 is the same as the inclination angle of the retaining surface 60 of the recess 48 relative to the central axis of the insertion hole 44 (see reference). Figure 7 ).

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

[0094] Viewed axially from the tool axis 34, when an imaginary line L is defined as a line segment parallel to the central axis of the cutting tool 122 and passing through the tool tip 72, the second pressed surface 130 is positioned separate from the tool tip 72 relative to the imaginary line L. The pressing member 84, housed in the recess 48, abuts against the second pressed surface 130 of the second grinding retraction portion 126. The pressing member 84 abuts against the locking surface 132.

[0095] In this cutting tool 120, when the pressing member 84 abuts against the second grinding retraction portion 126 to hold the cutting tool 122, force is applied to the cutting tool 122 toward the threaded portion 66 and to the inner circumferential surface 441 of the insertion hole 44 by abutting against the second pressed surface 130, thus fixing it in place. By pressing the member 84 against the locking surface 132, movement of the cutting tool 122 in the rotational direction (arrow A direction) can be suppressed. Accordingly, 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 can be further reliably suppressed when machining the workpiece W.

[0096] Viewed axially from the tool shaft 34, when an imaginary line L is defined as the line segment parallel to the central axis of the cutting tool 122 and passing through the tool tip 72, the pressing member 84 is positioned separate from the tool tip 72 relative to the imaginary line L. Therefore, when the cutting tool 122 is pulled out from the insertion hole 44 toward the second hole 52, the pressing member 84 does not contact the tool tip 72. Thus, when changing the cutting tool 122 from the tool shaft 34, the pressing member 84 can be removed without changing the cutting tool 122.

[0097] Alternatively, it can be used Figure 8 The cutting tool 140 involved in the second modified example shown has a pair of fastening bolts 861 and 862. The fastening bolts 861 and 862 are axially separated on the tool shaft 34.

[0098] Fastening bolt 861 is separately positioned above the cutting tool 36. Fastening bolt 862 is separately positioned below the cutting tool 36. That is, fastening bolts 861 and 862 are configured to clamp the cutting tool 36 in the axial direction of the tool shaft 34. When viewed from the axial direction of the tool shaft 34, fastening bolts 861 and 862 overlap.

[0099] Fastening bolts 861 and 862 are respectively inserted into bolt holes 46 of tool shaft 34.

[0100] The shaft portions 92 of the fastening bolts 861 and 862 are screwed into the threaded holes 881 and 882 of the pressing member 142, respectively. 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 retraction portion 68 of the cutting tool 36. Accordingly, compared with the case where pressing is performed by a single fastening bolt 86, a pressing force that applies force from the fastening bolts 861 and 862 to the upper and lower portions of the pressing member 142 can be applied to the cutting tool 36 more reliably at the central portion of the pressing member 142.

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

[0102] The above implementation methods can be summarized as follows.

[0103] The above embodiment is a cutting tool (18) of a cutting machine (10) for machining a workpiece (W). The cutting tool has a shaft (34), a cutting tool (36), a position adjustment mechanism (38), and a pressing mechanism (40), wherein, The shaft is driven to rotate by a drive mechanism (16); The cutting tool has a top end portion with a cutting edge (64) and a base end portion located on the side opposite to the top end portion. The cutting tool is inserted into an insertion hole (44) of the shaft that extends in a direction intersecting the axial direction of the shaft and is movable in the direction of the hole axis of the insertion hole. The cutting edge portion is configured to protrude radially outward from the outer peripheral surface of the shaft. The position adjustment mechanism is mounted on the shaft and is capable of adjusting the position of the cutting tool relative to the shaft in the direction of the hole axis. The pressing mechanism is mounted on the shaft and applies force to the cutting tool toward the base end by pressing the pressed part (68), and applies force to the inner surface of the insertion hole, wherein the pressed part is disposed between the cutting edge of the cutting tool and the base end.

[0104] The pressed portion is a stepped portion that has been cut off by the cutting tool. The stepped portion has an inclined surface (74), which is inclined relative to the cutting edge portion in the rotational direction of the shaft and relative to the central axis of the cutting tool. The pressing mechanism is in contact with the inclined surface.

[0105] The pressing mechanism has a pressing component (84) and a fastening bolt (86), wherein, The pressing component presses the pressed portion of the cutting tool; The fastening bolt is inserted through the shaft and screwed into the pressing component, which applies force to the shaft and the cutting tool.

[0106] The pressing mechanism includes a pressing component and a fastening bolt, wherein... The pressing member is configured to be substantially parallel to the inclined surface of the pressed portion, and presses the inclined surface; The fastening bolt is inserted into the shaft and screwed into the pressing member, which applies force to the shaft and the cutting tool.

[0107] When viewed from the axial direction of the shaft, the pressing member is configured in a direction away from the cutting edge relative to the line segment (L), wherein the line segment (L) is parallel to the central axis of the cutting tool and passes through the tip (72) of the cutting edge.

[0108] The position adjustment mechanism has an adjustment component (76) having an external thread (78) that engages with the inner surface of the insertion hole and an internal thread (80) that engages with the cutting tool. The adjustment component is rotatably disposed inside the insertion hole. The pitch of the internal thread is smaller than the pitch of the external thread.

[0109] The pressing component is arranged along the axial direction of the shaft. The fastening bolt is screwed onto one end of the pressing member along the axial direction, 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 bolts intersect with the cutting tool.

[0111] A set of fastening bolts is provided axially on the shaft, separated from the cutting tool.

[0112] The pressed portion has a first pressed surface and a second pressed surface, wherein, The first pressed surface is close to the cutting edge; The second pressing surface is positioned closer to the base end than the first pressing surface, and is positioned radially outward of the cutting tool relative to the first pressing surface. The second pressed surface is pressed by the pressing mechanism.

[0113] Furthermore, the present invention is not limited to the above-described embodiments, and various structures may be adopted without departing from the spirit of the present invention. [Explanation of reference numerals in the attached figures]

[0114] 10: Cutting machine; 16: Drive mechanism; 18, 120, 140: Cutting tools; 34: Tool spindle; 36, 122: Cutting tools; 38: Position adjustment mechanism; 40: Pressing mechanism; 44: Insertion hole; 46: Bolt hole; 64: Cutting edge; 66: Threaded part; 68: Grinding and retraction part; 76: Adjusting component; 84, 142: Pressing component; 86, 861, 862: Fastening bolt; 132: Locking surface.

Claims

1. A cutting tool (18), a cutting machine (10) for machining a workpiece (W), characterized in that, It has a shaft (34), a cutting tool (36), a position adjustment mechanism (38), and a pressing mechanism (40), wherein, The shaft is driven to rotate by a drive mechanism (16); The cutting tool has a top end portion with a cutting edge (64) and a base end portion located on the side opposite to the top end portion. The cutting tool is inserted into an insertion hole (44) of the shaft that extends in a direction intersecting the axial direction of the shaft and is movable in the direction of the hole axis of the insertion hole. The cutting edge portion is configured to protrude radially outward from the outer peripheral surface of the shaft. The position adjustment mechanism is mounted on the shaft and can adjust the position of the cutting tool relative to the shaft in the direction of the hole axis. The pressing mechanism is mounted on the shaft and applies force to the cutting tool toward the base end by pressing the pressed portion (68), and also applies force to the inner surface of the insertion hole, wherein the pressed portion is disposed between the cutting edge portion of the cutting tool and the base end. The pressing mechanism has a pressing component (84) and a fastening bolt (86), wherein, The pressing component presses the pressed portion of the cutting tool; The fastening bolt is inserted into the shaft and screwed into the pressing component, which applies force to the shaft and the cutting tool. When viewed from the axial direction of the shaft, the pressing member is configured in a direction away from the cutting edge relative to the line segment (L), wherein the line segment (L) is parallel to the central axis of the cutting tool and passes through the tip (72) of the cutting edge.

2. The cutting tool according to claim 1, characterized in that, The pressed portion is a stepped portion that has been cut off by the cutting tool. The stepped portion has an inclined surface (74), which is inclined relative to the cutting edge portion in the rotational direction of the shaft and relative to the central axis of the cutting tool. The pressing mechanism is in contact with the inclined surface.

3. The cutting tool according to claim 1 or 2, characterized in that, The position adjustment mechanism has an adjustment component (76) having an external thread (78) that engages with the inner surface of the insertion hole and an internal thread (80) that engages with the cutting tool. The adjustment component is rotatably disposed inside the insertion hole. The pitch of the internal thread is smaller than the pitch of the external thread.

4. The cutting tool according to claim 1, characterized in that, The pressing component is arranged along the axial direction of the shaft. The fastening bolt is screwed onto one end of the pressing member along the axial direction, and the other end of the pressing member along the axial direction abuts against the cutting tool.

5. The cutting tool according to claim 1 or 4, characterized in that, When viewed from the axial direction of the shaft, the fastening bolts intersect with the cutting tool.

6. The cutting tool according to claim 1, characterized in that, A set of fastening bolts is provided axially on the shaft, separated from the cutting tool.

7. The cutting tool according to claim 1, characterized in that, The pressed portion has a first pressed surface and a second pressed surface, wherein, The first pressed surface is close to the cutting edge; The second pressing surface is positioned closer to the base end than the first pressing surface, and is positioned radially outward of the cutting tool relative to the first pressing surface. The second pressed surface is pressed by the pressing mechanism.

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