JP2006263828A - Cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool used in cutting the inner wall surface of a prepared hole provided in a material to be cut, adjusting the position of a cutting blade in the radial direction of a tool body and widely applicable to a general machining tool such as a machining center. <P>SOLUTION: In this cutting tool, a cutting blade is part 63 is provided on the outer periphery of the tip of the tool body 11. The tool body 11 is provided with a columnar adjusting bar 21 disposed along the axis O of the tool body 11 and an adjusting pin 41 disposed to cross the adjusting bar 21. The side of the adjusting bar 21 is provided with a sliding contact surface 26 inclined to one plane parallel to the axis of the adjusting bar 21, one end face of the adjusting pin 41 is abutted on the sliding contact surface 26, the other end face of the adjusting pin 41 is directed toward the radial inside surface of the tool body 11, and the tip side of the tool body 11 of the adjusting bar 21 is provided with an adjusting nut 31 for moving the adjusting bar 21 in the direction of the axis O of the tool body 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting tool such as a boring cutter used when cutting an inner wall surface of a pilot hole provided in advance in a workpiece.

In recent years, as a cutting tool used for machining a cylinder bore of an engine, for example, a boring cutter having an insert having a cutting edge detachably attached to the outer periphery of a tip end of a tool body as shown in Patent Document 1 is known. It has been.
In the cutting tool disclosed in Patent Document 1, the tool body is attached to the spindle end of a machine tool via an adapter or the like, and is rotated at high speed around the axis of the tool body, and is fed in the axial direction of the tool body. The inner wall surface of the prepared hole is cut by the cutting edge of the insert that is inserted into the prepared hole provided in the workpiece in advance and is attached to the outer periphery of the tip of the tool body to form a processed hole having a predetermined inner diameter. It is.

In these cutting tools, it is necessary to adjust the position of the insert in the radial direction of the tool body in order to accurately cut the inner wall surface of the pilot hole with the cutting edge of the insert. In addition, the cutting edge of the insert has a large amount of wear in the initial stage of use, and the position of the cutting blade in the radial direction of the tool body changes during the use of the cutting tool, so that the cutting tool remains attached to the machine tool. It is necessary to adjust the position in the tool body radial direction.
Therefore, Patent Document 2 discloses a draw bar type boring bar that draws a draw bar arranged along the tool body axial direction toward the tip end of the tool body and adjusts the radial position of the cutting blade.

The boring bar configured as described above can accurately adjust the position of the cutting blade in the radial direction of the tool body. It can be formed.
Registered Utility Model No. 2585714 JP 2002-283112 A

However, in the boring bar disclosed in Patent Document 2, it is necessary to provide a pulling device dedicated to the boring bar in order to pull the draw bar, and machine tools that can use the boring bar are limited and widely used. It was something that could not be used.
In particular, in recent years, computer-controlled processing by a machining center has been widely performed. However, since the above-described boring bar requires a dedicated draw bar pull-in device, it cannot be applied to a general machining center.
In addition, because a dedicated pulling device for the boring bar is required, depending on the dimensional accuracy and size of the material to be cut, it is necessary to replace the corresponding boring bar and pulling device. There was a problem of becoming complicated.

  The present invention has been made in view of the above-described circumstances, and is a cutting tool used when cutting an inner wall surface of a prepared hole previously provided in a workpiece, and a cutting tool main body An object of the present invention is to provide a cutting tool that can adjust the radial position with high accuracy and is widely applicable to general machine tools such as a machining center.

  In order to achieve the above object, the present invention includes a cylindrical tool body that is rotated around an axis, and a cutting edge portion having a cutting edge is provided on an outer periphery of a tip portion of the tool body. A cutting tool that cuts an inner wall surface of a pilot hole provided in a workpiece by cutting to form a machining hole having a predetermined inner diameter, and is disposed along the axis of the tool body inside the tool body A columnar adjustment bar and an adjustment pin arranged so as to intersect the adjustment bar, and the side surface of the adjustment bar has a sliding surface inclined with respect to a plane parallel to the axis of the adjustment bar. A contact surface is provided, and one end surface of the adjustment pin is brought into contact with the sliding contact surface, and the other end surface of the adjustment pin is directed to a surface of the cutting blade portion facing inward in the tool body radial direction. The position of the tool body radial direction of the cutting blade portion can be adjusted, The said tool body distal end side of the integer bars, characterized in that the adjustment nut for moving the adjusting bar in the axial direction of the tool body is provided.

In the cutting tool having the above-described configuration, the adjustment bar disposed along the axis of the tool body and the sliding contact surface provided on the side surface of the adjustment bar and inclined with respect to one surface parallel to the axis of the adjustment bar. Since one end face is abutted and the other end face is provided with an adjustment pin directed to the surface facing the tool body radial inner side of the cutting blade portion, by moving the adjustment bar in the tool body axial direction, The adjustment pin moves in the tool main body radial direction along the inclination of the sliding contact surface to press the cutting blade portion, and the position of the cutting blade in the tool main body radial direction can be adjusted.
In addition, the amount of movement of the adjustment pin in the tool body radial direction relative to the amount of movement of the adjustment bar in the tool body axial direction can be adjusted by changing the inclination angle between the sliding contact surface and one surface parallel to the axis of the adjustment bar. Therefore, the position of the cutting blade in the radial direction of the tool body can be adjusted with higher accuracy.

In addition, an adjustment nut for moving the adjustment bar in the axial direction of the tool body is provided on the tool body tip side, so by rotating the adjustment nut from the tool body tip side, The position can be adjusted, and the position of the cutting blade in the radial direction of the tool body can be adjusted without removing the cutting tool from the machine tool.
Here, devices for rotating the nut from the front end side of the tool main body are already widely provided. By installing these devices on a machine tool such as a machining center, the position of the cutting blade in the radial direction of the tool main body can be adjusted. Therefore, this cutting tool can be widely applied to general machine tools, and the entire processing system can be configured simply.

  Further, by providing a biasing member that biases the adjustment bar toward the tip end side of the tool body on the tool body rear end side of the adjustment bar, the adjustment bar is always pressed to the adjustment nut side, The so-called backlash between the adjustment nut and the adjustment bar can be prevented, so that the position of the adjustment bar in the axial direction of the tool body can be adjusted with high accuracy, and the radial position of the tool body in the tool body can be adjusted with higher accuracy. Can be adjusted.

Further, a key groove extending in the axial direction is formed on a side surface of the adjustment bar other than the sliding contact surface, and the tool bar is provided with a key member that fits into the key groove. Therefore, the adjustment bar is prevented from moving in directions other than the tool body axial direction.
Further, since the key member is fitted in the key groove of the adjustment bar, the adjustment bar is prevented from rotating in the tool body even when the adjustment bar is formed in a columnar shape, for example. Since the contact surface can always be arranged toward the adjustment pin, the position adjustment of the cutting blade in the tool body radial direction can be reliably performed.

  Further, by providing a disc-shaped head on the tip end side of the tool body of the adjustment nut, the nut gripping portion of the automatic adjustment machine provided on the machine tool is configured as a collet chuck or the like. The adjusting nut can be gripped without rotating the gripping part or the adjusting nut, the amount of rotation of the adjusting nut can be adjusted with high accuracy, and the position of the cutting blade in the radial direction of the tool body can be performed with higher accuracy.

  Further, the cutting blade portion is provided in a flat cartridge, and the cartridge is provided with a mounting portion for mounting the cartridge on the tool main body so as to be adjacent to the cutting blade portion, and the tool main body radial direction of the cartridge is provided. A slit extending so as to divide the cutting blade portion and the mounting portion is formed on the inwardly facing surface, and the other end surface of the adjustment pin faces the inner side in the tool body radial direction of the cutting blade portion of the cartridge. When the surface of the cutting edge portion facing the inner side in the tool body radial direction is pressed by contacting the surface, the cartridge is elastically deformed with the end point of the slit as a fulcrum, and the cutting edge moves outward in the tool body radial direction. Moreover, if the force which presses the surface which faces the tool main body radial direction inside of a cutting blade part is made small, the cartridge which was elastically deformed will elastically return, and a cutting blade will move to a tool main body radial inside. Thus, since the position of the cutting blade in the tool body radial direction can be adjusted so as to advance and retreat, the position of the cutting blade in the tool body radial direction can be adjusted easily and accurately.

  Therefore, according to this invention, it is a cutting tool used when cutting the inner wall surface of the pilot hole previously provided in the workpiece, and the position of the cutting blade in the radial direction of the tool body can be adjusted with high accuracy. In addition, a cutting tool that can be widely applied to general machine tools such as a machining center can be provided.

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 3 show a boring cutter which is a cutting tool of this embodiment.
The boring cutter 10 has a tool body 11 formed in a columnar shape, and an insert 61 having a cutting edge 62 is provided on the outer peripheral portion of the tool body 11 on the tip side (lower side in FIG. 1).

The tool body 11 is made of steel or the like, and as shown in FIGS. 1 and 2, the outer shape of the tool body 11 is formed in a columnar shape centered on the axis O, and the tool body 11 has a rear end (upper side in FIG. 1). A mounting portion 12 for mounting on a machine tool or the like (not shown) is provided.
In addition, a recess 13 having a circular cross section having a bottom surface perpendicular to the axis O is formed at the tip of the tool body 11, and a bolt hole 14 is provided in the circumferential direction on the radially outer side of the recess 13. A plurality (6 positions as shown in FIG. 2 in this embodiment) are formed at equal intervals in parallel to the axis O.

  As shown in FIG. 3, the tool body 11 is provided with one tip pocket 15 cut out so as to open to the outside of the tool body 11 in the radial direction and the front side of the tool rotation direction T, as shown in FIG. A notch 16 in which the cartridge 51 is accommodated is formed on the rear side of the tip pocket 15 in the tool rotation direction T. A wall surface 16A on the inner side in the radial direction of the tool body 11 of the notch 16 is arranged so as to extend perpendicularly to the radial direction of the tool body 11, and a mounting screw hole 17 is formed on the wall surface 16A as shown in FIG. The tool body 11 is bored inward in the radial direction.

Then, inside the tool body 11, as shown in FIG. 1, the tool body 11 opens at the tip surface of the tool body 11 and extends coaxially along the axis O of the tool body 11 to the center of the tool body 11 in the axis O direction. A bar accommodating hole 18 is formed.
A pin receiving hole 19 is provided on the tip end side of the bar receiving hole 18 so as to be connected to the bar receiving hole 18 and extend perpendicular to the axis O. The pin receiving hole 19 is shown in FIG. As described above, the notch 16 is opened in the wall surface 16 </ b> A on the radially inner side of the tool body 11.

  As shown in FIG. 1, the bar receiving hole 18 is connected to the bar receiving hole 18 at the rear side of the pin receiving hole 19 and perpendicular to the axis O. A key member accommodation hole 20 extending on the opposite side is formed, and is opened on the outer peripheral surface of the tool body 11 on the opposite side across the notch 16 and the axis O, and the distal end side of the tool body 11 and the tool body of the opened portion On the rear end side, a fixing bolt hole for attaching the key member 46 is formed perpendicular to the axis O.

As shown in FIG. 1, the adjustment bar 21 accommodated in the bar accommodation hole 18 is formed in a multistage cylindrical shape, and has an outer diameter approximately the same as the inner diameter of the bar accommodation hole 18, and the other of the barrels 22. And a screw portion 24 having a smaller diameter than the body portion 22 and having an external thread formed on the outer periphery thereof. A coil spring 25 is disposed on one end side of the adjustment bar 21. ing.
Further, a sliding contact surface 26 is formed on the side surface of the body portion 22 so as to recede toward the inside of the adjustment bar 21 toward the one end side, and on the opposite side of the sliding contact surface 26. A key groove 27 having a pair of wall surfaces extending along the axis of the adjustment bar 21 is formed.

  The adjustment nut 31 for moving the adjustment bar 21 has a multi-stage columnar shape as shown in FIG. 1. Inside the adjustment nut 31 is an axis of a cylinder formed by the adjustment nut 31 that opens to the rear end surface of the adjustment nut 31. A screw hole portion 32 having a coaxial circular cross section and longer than the axial length of the screw portion 24 of the adjustment bar 21 is provided, and a female screw portion is formed on the inner peripheral surface of the screw hole portion 32. On the rear end side (upper side in FIG. 1) of the adjusting nut 31, a sliding portion 33 that can be fitted in the concave portion 13 on the distal end side of the tool body 11 is formed. A nut main body 34 that is one step smaller in diameter than 33 and a head 35 that is one step smaller in diameter than the nut main body 34 and circular in cross section are provided.

  The ring member 36 for attaching the adjustment nut 31 to the tool main body 11 has an outer shape formed in a ring shape, and the inner peripheral surface of the ring hole 37 and the outer peripheral surface of the nut main body 34 are slidably disposed. On the outer peripheral side of the ring hole 37, a plurality of mounting bolts 38 for attaching the ring member 36 to the tip surface of the tool body 11 are provided at equal intervals in the circumferential direction (in this embodiment, six locations as shown in FIG. 2). ing. A scale indicating the rotational position of the adjustment nut 31 is displayed on the tip surface of the ring member 36.

The adjustment pin 41 accommodated in the pin accommodation hole 19 has an outer diameter that is cylindrical, and one end surface is a contact surface 42 that is in contact with the sliding contact surface 26 of the adjustment bar 21. The surface 42 is an inclined surface inclined with respect to a plane perpendicular to the axis of the cylinder formed by the adjustment pin 41, and the angle formed between the plane perpendicular to the axis of the cylinder formed by the adjustment pin 41 and the contact surface 42 is adjusted. The inclination angle of the sliding contact surface 26 of the bar 21 is the same. The other end surface of the adjustment pin 41 is a pressing surface 43 that presses the cutting edge portion 63 and is a plane perpendicular to the axis of the cylinder formed by the adjustment pin 41.
The key member 46 accommodated in the key member accommodation hole 20 includes a key body that can be fitted in the key groove 27 of the adjustment bar 21, and a fixing portion that fixes the key member 46 to the tool body 11. Is provided with a fixing bolt 47.

  The cartridge 51 fitted into the notch 16 is formed in a flat plate shape, and an insert mounting seat 52 for mounting the insert 61 and a mounting portion 53 for mounting the cartridge 51 on the tool main body 11 are provided side by side. A slit 54 extending so as to divide the insert mounting seat 52 and the mounting portion 53 is formed on the surface of the cartridge 51 facing the inside of the tool body 11 in the radial direction, and the depth of the slit 54 is about 1 / th of the thickness of the cartridge 51. 2.

As shown in FIG. 3, the wall surface 52A on the rear side in the tool rotation direction T of the insert mounting seat 52 is inclined so as to gradually recede toward the rear side in the tool rotation direction T as it goes outward in the radial direction of the tool body 11. A fixing screw for fixing the insert 61 is screwed to the wall surface 52A.
In addition, a pressing pin 55 arranged along the radial direction of the tool body 11 is inserted into the distal end side of the tool body 11 of the insert mounting seat 52, and the inner surface of the pressing body 55 in the radial direction of the tool body 11 is It is directed to the pin accommodation hole 19 of the tool body 11.

The insert 61 fixed to the cartridge 51 has a square flat plate shape, the square surface is a rake face, and a cutting edge 62 is provided on a side ridge portion of the square surface. As shown in FIG. The negative insert 61 is not attached.
The insert 61 is fixed to the insert mounting seat 52 with a fixing screw, and the insert 61 and the insert mounting seat 52 constitute a cutting edge portion 63.

The adjustment bar 21, the adjustment pin 41, and the cartridge 51 are assembled to the tool body 11 as follows to constitute the boring cutter 10.
First, the adjustment bar 21 in which the coil spring 25 is arranged on one end side is inserted into the bar accommodation hole 18 so that the sliding contact surface 26 faces the pin accommodation hole 19 and the key groove 27 becomes the key member accommodation hole 20. It is arranged to face. The key member 46 is inserted into the key member receiving hole 20 so that the key body engages with the key groove 27 and is fixed to the tool body 11 by the fixing bolt 47, and the adjustment bar 21 can be moved only in the axis O direction. The

  The adjustment nut 31 is screwed onto the screw portion 24 of the adjustment bar 21, and the bottom surface of the recess 13 at the tip of the tool body 11 and the rear end surface of the adjustment nut 31 are brought into contact with each other. The ring member 36 is fitted into the adjustment nut 31, and a mounting bolt 38 disposed around the ring hole 37 is screwed into the bolt hole 14 on the tip surface of the tool body 11, so that the ring member 36 is on the tip surface of the tool body 11. Attached to. Here, the inner peripheral surface of the ring hole 37 of the ring member 36 and the outer peripheral surface of the nut body 34 are arranged so as to be slidable.

The adjustment pin 41 is inserted from the opening of the wall surface 16A on the radially inner side of the tool body 11 of the notch 16 of the pin housing hole 19, and the sliding contact surface 26 of the adjustment bar 21 and the contact surface 42 of the adjustment pin 41 come into contact with each other. Are arranged as follows.
The cartridge 51 is disposed in the cutout portion 16, and a mounting screw 56 is inserted through the mounting portion 53 of the cartridge 51, and is screwed into the mounting screw hole 17 formed in the wall surface 16 </ b> A on the radially inner side of the tool body 11 of the cutout portion 16. As a result, the cartridge 51 is accommodated in the notch 16. Here, the end surface of the pressing pin 55 inserted into the cartridge 51 is brought into contact with the pressing surface 43 of the adjustment pin 41.

  In the boring cutter 10 configured in this way, after the position of the cutting blade 62 in the radial direction of the tool body 11 is adjusted, the mounting portion 12 of the tool body 11 is attached to the spindle end of a machine tool such as a machining center via an adapter or the like. Attached, rotated at high speed around the axis O of the tool body 11, fed in the direction of the axis O of the tool body 11, inserted into a prepared hole provided in advance in the workpiece, and a cutting edge 62 of the insert 61. Then, the inner wall surface of the prepared hole is cut to form a processed hole having a predetermined inner diameter.

  In this boring cutter 10, the position of the cutting blade 62 in the radial direction of the tool body 11 is adjusted by, for example, an automatic adjuster provided in the machine tool while the tool body 11 is attached to the spindle end of the machine tool as described above. This is done by turning the adjustment nut. By rotating the adjustment nut 31 in this way, the adjustment bar 21 moves along the female screw of the screw hole portion 32 of the adjustment nut 31, but the adjustment nut 31 is the tip of the tool body 11 in the direction of the axis O of the tool body 11. Since it is fixed to the surface and cannot move, the adjustment bar 21 moves in the direction of the axis 11 of the tool body 11.

  Here, the sliding contact surface 26 on the side surface of the adjustment bar 21 is formed so as to recede to the inside of the adjustment bar 21 toward the one end side, and the contact surface 42 of the adjustment pin 41 is formed on the sliding contact surface 26. Since the adjustment pin 41 is disposed along the radial direction of the tool body 11, the adjustment bar 21 moves to the rear end side of the tool body 11, that is, one end side of the adjustment bar 21. The adjustment pin 41 is moved outward in the radial direction of the tool body 11 along the inclination of the slidable contact surface 26, and the pressing surface 43 of the adjustment pin 41 presses the pressing pin 55 inserted into the cartridge 51. The cutting edge 62 is elastically deformed with the end point of the slit 54 as a fulcrum, and the tool body 11 protrudes outward in the radial direction of the tool body 11.

  On the other hand, when the adjustment bar 21 moves to the tip end side of the tool body 11, that is, the threaded portion 24 side of the adjustment bar 21, the adjustment pin 41 is moved radially inward along the inclination of the sliding contact surface 26. The pressing force with which the pressing surface 43 of the adjustment pin 41 presses the pressing pin 55 is reduced. Therefore, the elastically deformed cartridge 51 is elastically restored, and the cutting blade 62 is retracted radially inward of the tool body 11.

In this boring cutter 10, the position of the cutting blade 62 in the radial direction of the tool body 11 can be adjusted so as to advance and retreat as described above. Therefore, the position of the cutting blade 62 can be adjusted easily and accurately. Processing accuracy can be improved.
Further, by rotating the adjustment nut 31 from the distal end side of the tool body 11, the adjustment bar 21 can be moved in the direction of the axis O of the tool body 11, and the position of the cutting blade 62 in the radial direction of the tool body 11 can be adjusted. The boring cutter 10 can be used in a machine tool such as a machining center incorporating an automatic adjuster having a nut gripping portion. Therefore, a dedicated drawing device is not required for the machine tool, and the entire machining system can be simplified.
Further, since the position of the cutting blade 62 in the radial direction of the tool body 11 can be adjusted with the boring cutter 10 attached to the machine tool, even when the initial wear of the cutting blade 62 of the insert 61 is large, the machining hole is formed with high accuracy. be able to.

  Further, since the coil spring 25 is fitted on one end side of the adjustment bar 21, the adjustment bar 21 is always pressed toward the adjustment nut 31, and the female screw of the screw hole portion 32 of the adjustment nut 31. And so-called backlash can be prevented, the position of the adjustment bar 21 in the direction of the axis 11 of the tool main body 11 can be adjusted with high accuracy, and the tool body of the cutting blade 62 can be accurately adjusted. The 11 radial position can be adjusted with higher accuracy.

  Further, a key groove 27 extending in the direction of the axis O is formed on the opposite side of the sliding contact surface 26 of the adjustment bar 21, and a key member 46 that fits into the key groove 27 is inserted. Since the guide 46 is guided by the member 46 and moves along the key groove 27, the tool body 11 is prevented from moving in directions other than the axis O direction, and the sliding contact surface 26 can always be arranged in the direction of the pin receiving hole 19; The position adjustment in the radial direction of the tool main body 11 can be reliably performed.

  Further, since the adjustment nut 31 has a disk-shaped head portion 35, the nut gripping portion of the automatic adjuster provided in the machine tool is configured as a collet chuck or the like, and the nut gripping portion or the tool body 11 is configured. The adjusting nut 31 can be gripped without moving the rotational position. That is, if the head portion 35 of the adjusting nut 31 is hexagonal and the nut gripping portion is also a hexagonal hole corresponding thereto, the nut gripping portion and the tool body 11 are rotated until these hexagons can be fitted. There is a possibility that an error may occur in the adjustment amount of the position of the cutting blade 62 due to the rotation of the adjustment nut 31 by the amount of rotation in the meantime, but in this embodiment, the nut gripping portion and the adjustment nut 31 are rotated. Since the adjustment nut 31 can be gripped without any adjustment, the amount of rotation of the adjustment nut 31 can be adjusted with high accuracy, and the position of the cutting blade 62 in the radial direction of the tool body 11 can be performed with higher accuracy.

  In this embodiment, a male screw is formed on the screw portion 24 of the adjustment bar 21, a screw hole portion 32 is provided on the adjustment nut 31, and a female screw is formed on the inner peripheral surface of the screw hole portion 32. Although described, the present invention is not limited to this configuration. For example, a screw hole may be formed in the screw portion 24 of the adjustment bar 21 and a male screw may be formed in the adjustment nut 31. It is sufficient that the adjustment bar 21 is moved in the direction of the axis O of the tool body 11 by moving.

Further, although the description has been made with the cartridge 51 in which the insert 61 is fixed in the notch portion 16 of the tool body 11, the present invention is not limited to this. For example, the insert 61 is directly fixed to the tool body 11, The structure which presses the insert 61 with the adjustment pin 41 may be sufficient.
Further, although the adjustment bar 21 is described as being formed in a columnar shape, the present invention is not limited to this. For example, the adjustment bar 21 may be a rectangular column shape, and is a sliding contact inclined with respect to the axis of the column formed by the adjustment bar 21. Any configuration may be used as long as the surface 26 is formed and the rear end surface of the adjustment pin 41 is in contact with the sliding contact surface 26.
Moreover, although demonstrated using the adjustment nut 31 which has the disk shaped head 35, it is not limited to this, For example, you may have the hexagonal head 35. FIG. In this case, the position of the cutting blade 62 in the radial direction of the tool body 11 can be adjusted by manually turning the adjustment nut 31 and using the scale displayed on the tip surface of the ring-shaped member 36.

  Moreover, although the chip pocket 15 was formed in one place and one insert 61 was described, the present invention is not limited to this, and a plurality of chip pockets 15 are formed and a plurality of inserts 61 are disposed. It may be. In this case, it is necessary to provide a plurality of sliding contact surfaces 26 so that the position of the cutting blade 62 of the other insert 61 in the radial direction of the tool body 11 can be adjusted.

It is a side surface fragmentary sectional view of the boring cutter which is this embodiment. It is a bottom view of the boring cutter which is this embodiment. It is XX sectional drawing in FIG.

Explanation of symbols

10 Boring cutter (cutting tool)
11 Tool body 21 Adjustment bar 25 Coil spring (biasing member)
26 Sliding contact surface 27 Key groove 31 Adjustment nut 35 Head 41 Adjustment pin 46 Key member 51 Cartridge 53 Mounting portion 54 Slit 62 Cutting blade 63 Cutting blade portion

Claims (5)

A cylindrical tool body that rotates about an axis, and a cutting edge portion having a cutting edge is provided on the outer periphery of the tip of the tool body, and the inside of the prepared hole provided in the workpiece by the cutting edge A cutting tool that forms a hole with a predetermined inner diameter by cutting a wall surface,
Inside the tool body, a columnar adjustment bar arranged along the axis of the tool body, and an adjustment pin arranged to intersect the adjustment bar are provided,
A side surface of the adjustment bar is provided with a sliding contact surface inclined with respect to one surface parallel to the axis of the adjustment bar, and one end surface of the adjustment pin is in contact with the sliding contact surface, The other end surface of the adjustment pin is directed to the surface of the cutting blade portion facing the inner side in the tool body radial direction, and the position of the cutting blade portion in the tool body radial direction can be adjusted.
A cutting tool characterized in that an adjustment nut for moving the adjustment bar in the axial direction of the tool main body is provided on the tip end side of the tool main body of the adjustment bar.  2. The cutting tool according to claim 1, wherein a biasing member that biases the adjustment bar toward the tip end side of the tool body is provided on the rear end side of the tool body of the adjustment bar.   The key groove extending in the axial direction is formed on a side surface of the adjustment bar other than the sliding contact surface, and the tool body is provided with a key member that fits into the key groove. The cutting tool according to claim 1 or 2.   The cutting tool according to any one of claims 1 to 3, wherein a disk-shaped head is provided on a tip end side of the tool body of the adjustment nut. The cutting blade portion is provided in a flat cartridge, and the cartridge is provided with a mounting portion for mounting the cartridge on the tool main body so as to be adjacent to the cutting blade portion, and the tool main body of the cartridge On the surface facing radially inward, a slit extending so as to separate the cutting blade portion and the mounting portion is formed,
The other end surface of the adjustment pin is in contact with a surface of the cutting blade portion of the cartridge that faces the inside of the tool main body in the radial direction of the tool body. Cutting tools.

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