CN109862980B

CN109862980B - Working machine having position correction function and position correction method for working machine

Info

Publication number: CN109862980B
Application number: CN201780058841.XA
Authority: CN
Inventors: 驹井保宏; 藤原吏志; 佐佐木宽史
Original assignee: NT Engineering KK
Current assignee: NT Engineering KK
Priority date: 2016-08-25
Filing date: 2017-08-24
Publication date: 2020-08-11
Anticipated expiration: 2037-08-24
Also published as: JP2018030224A; WO2018038276A1; DE112017004239T5; CN109862980A; JP6763504B2

Abstract

A machine tool (10) having a position correction function is provided with a tool holder (20), an inclined member (26), a peripheral ring member (40), and a conversion mechanism (44). The tilting member (26) is mounted via a support pin (28) so as to be tilted in a radial direction of the tool holder (20), positioned inside the tool holder (20), and provided with an engagement portion (38). A conversion mechanism (44) is provided between the outer peripheral ring member (40) and the engagement portion (38), and converts the rotational motion of the outer peripheral ring member (40) into a tilting motion in the radial direction of the tilting member (26).

Description

Working machine having position correction function and position correction method for working machine

Technical Field

The present invention relates to a work machine having a position correction function in which a tool is attached to a tool holder rotatable integrally with a spindle in such a manner that the position of the tool can be corrected, and a position correction method of the work machine.

Background

In general, various machining beds (work machines) that perform machining on a workpiece by means of a tool (such as a machining tool) attached to a tool holder are used. For example, boring of a cylinder forming an engine block requires machining of inner cylinder diameter dimensions on the order of microns with high precision.

However, for example, in an engine of an automobile, when machining is performed with the same blade (even with a hard tool such as a CBN tool) in mass production, wear also occurs in the blade. Thus, the wear reduces the working diameter of the cutting edge of the tool. Thus, in order to maintain the diameter of the fixing hole, a calibration jig having a calibration function is used.

For example, a blade position adjusting device of a machine tool disclosed in patent document 1 is known. Patent document 1 is a machine tool which controls X, Y and a Z-axis drive motor, and performs machining on a workpiece with a blade tool of a spindle front end, wherein the spindle is rotatably supported on a spindle head, a tool holder is detachably mounted in the front end of the spindle, the tool holder rotatably includes an adjustment shaft at a position eccentric from a rotation shaft of the spindle, and by rotating the adjustment shaft, a radial edge position of the blade tool provided in the tool holder is adjusted in such a manner that the position of the blade tool can be radially displaced, the machine tool comprising: a rotation preventing member to be engaged with and disengaged from the adjustment shaft on a fixed side of the machine tool; and a control device which moves the spindle head in X and Y axis directions orthogonal to an axis of the spindle by the X and Y axis driving motors and controls the spindle head in the X and Y axis directions to rotate the spindle about the axis of the adjusting shaft in a state where the adjusting shaft is locked on the rotation preventing member.

Documents of the prior art

Patent document

Patent document 1

Japanese patent laid-open No.2002-36009

Disclosure of Invention

Technical problem to be solved by the invention

However, in the above-mentioned patent document 1, a slit is provided in the tool holder main body, and the position of the blade is adjusted by elastic deformation. Therefore, there is a problem of lowering the rigidity of the tool holder itself. Also, there is a possibility that the procedure becomes complicated and the control speed is reduced. Further, the front end of the tool holder needs to be fixed by the rotation preventing member, and there is a problem that the degree of freedom of blade design is reduced.

An object of the present invention is to provide a working machine having a position correcting function capable of correcting the position of a tool attached to a tool holder with high accuracy and high resolution in such a machining device with a simple and compact configuration, and a position correcting method for the working machine.

Means for solving the problems

A work machine having a position correcting function according to the present invention includes a tool holder, a tilting member, an engagement mechanism, and an adjustment device. The tool holder is rotatable integrally with the spindle. The inclined member is tiltably mounted on the fulcrum portion in a radial direction crossing a rotational axis direction of the tool holder in an end portion of the tool holder on the opposite side of the spindle, and includes an engaging portion on an inner side of the fulcrum portion in the tool holder, and the tool is attached to the tool holder outside the tool holder. The engagement mechanism is engageable with a peripheral ring member rotatably provided in the outer periphery of the tool holder by moving forward and backward in the radial direction with respect to the rotational axis of the tool holder.

The adjustment mechanism corrects the position of the tool mounted in the tool holder in the radial direction of the tool holder by rotating the peripheral ring member relative to the tool holder in a state where the engagement mechanism is engaged with the peripheral ring member. The adjusting device comprises: one or more claw portions provided in an inner peripheral portion of the outer peripheral ring member; one or more gear portions provided offset from a rotational axis of the tool holder, the gear portions being engaged with the claw portions and rotated only when the outer peripheral ring member performs a rotating action; and a conversion mechanism that converts a rotational motion of the gear portion into a radial tilting motion of the tilting member. The conversion mechanism includes: a rotary screw member that is offset from the rotary shaft and rotates integrally with the gear portion; and a tapered member to which the rotating screw member is screwed, the tapered member including a tapered surface that is inclined in the rotation axis direction and abuts the engagement portion, the tapered member being movable forward and backward in the rotation axis direction.

Preferably, an elastic member to be abutted with the inclined member to press the engaging portion to the tapered surface is provided in the tool holder.

Further, it is preferable that a ball plunger fitted between the teeth of the gear portion is provided in the tool holder.

Further, preferably, although the tapered member has a rectangular shape and the tapered surface abuts the engagement portion, a plurality of other surfaces are supported on the inner surface of the tool holder.

Preferably, the engaging portion has a convex curved surface abutting against the tapered surface.

Further, preferably, one or more groove portions are provided on one side surface of the outer peripheral ring member, and a ball plunger that engages with the groove portions to hold the outer peripheral ring member is provided in the tool holder.

Further, preferably, the engagement mechanism includes: an engagement recess or an engagement projection provided on an outer peripheral surface of the outer peripheral ring member; and an engagement member which engages with the engagement recess or the engagement projection to rotate the peripheral ring member relative to the tool holder.

In the position correction method of the present invention, the radial tilting action of the tilting member is performed by the conversion mechanism one or more times by rotating the spindle one turn in a state where the outer peripheral ring member is non-rotatably held by the engagement mechanism, and the amount of radial movement is set by controlling the rotation time of the spindle.

The invention has the advantages of

With the work machine having a position correcting function according to the present invention, the rotating screw member that is offset from the rotation axis of the tool holder is rotated when the outer peripheral ring member is rotated relative to the tool holder. The rotary screw member is screwed to the tapered member, and the tapered member is moved in the direction of the rotation axis of the tool holder by the rotating operation of the rotary screw member.

At this time, the engaging portion of the inclined member abuts against the tapered surface of the tapered member. When the tapered member is moved in the direction of the rotation axis, the engaging portion is displaced in the radial direction of the tool holder along the inclination of the tapered surface. Therefore, the inclined member is inclined on the fulcrum portion in the radial direction of the tool holder, so that the tool can be corrected and moved.

Thus, the positions of the tools attached to the tool holder can be corrected in the radial direction of the tool holder with high accuracy and high resolution on the order of micrometers in a simple and compact configuration.

With the position correction method of a work machine having a position correction function according to the present invention, the amount of radial movement of the tool is set by controlling the rotation time of the spindle. Therefore, for example, the amount of movement of the tool is accurately set by only rotating the spindle once or twice.

Drawings

Fig. 1 is an exemplary perspective view of a machine tool serving as a working machine having a position correction function according to an embodiment of the present invention.

Fig. 2 is an exemplary sectional view of an essential part of the machine tool.

Fig. 3 is a cross-sectional view of the machine tool taken along line III-III in fig. 2.

Fig. 4 is a cross-sectional view of the machine tool taken along line IV-IV in fig. 2.

Fig. 5 is a cross-sectional view of the machine tool taken along line V-V in fig. 2.

Fig. 6 is an exemplary cross-sectional view of a tool holder forming a machine tool.

Fig. 7 is an explanatory view of an operation when the outer peripheral ring member forming the machine tool is engaged with the shank.

Fig. 8 is an operation illustration when the relative position between the outer peripheral ring member and the stem is adjusted by NC control.

Fig. 9 is an explanatory view of the operation when the stem is inserted into the engagement recess of the outer peripheral ring member.

Fig. 10 is an explanatory view of the operation when the outer peripheral ring member is rotated with respect to the mandrel.

Fig. 11 is an exemplary operation diagram when the pawl portion forming the conversion mechanism moves and abuts the gear portion.

Fig. 12 is an explanatory diagram of the operation when the gear portion is rotated and the ball plungers are separated from the teeth.

Fig. 13 is an exemplary operation diagram when the pawl portion is separated from the gear portion.

Fig. 14 is an explanatory view of the operation when the boring bar is corrected in the radial direction by the conversion mechanism.

Detailed Description

As shown in fig. 1, a machine tool 10 forming a working machine with a position correction function according to an embodiment of the present invention includes a main body 12. The spindle housing 14 is slidably mounted in the main body 12 in the X-axis direction, the Y-axis direction, and the Z-axis direction. As shown in fig. 2, a spindle (main shaft) 16 is rotatably provided in the spindle housing 14 by means of a bearing 18, and a tool holder 20 is detachably attached to the spindle 16. The work machine of the present application includes a function and a mechanism by which the tool holder 20 mounted in the spindle 16 of the machine tool 10 operates in conjunction with the action of the machine tool 10.

The tool holder 20 has a handle 22 coupled to the spindle 16, and a body housing 24 is integrally disposed in the handle 22. The tilting member 26 is tiltably mounted in the main body housing 24 on a support pin (fulcrum portion) 28 in a radial direction (arrow R direction) intersecting with a rotational axis direction (arrow L direction) of the tool holder 20.

The front end surface 24e of the main body case 24 has a flat substantially annular shape, and a first opening portion 30a and a second opening portion 30b are continuously formed in a central portion of the front end surface 24 e. As shown in fig. 3, the first opening portion 30a is formed in a substantially circular shape having linear portions 30ar on both sides, and a support pin 28 is provided to pass through the inclined member 26. As shown in fig. 2 and 4, the second opening portion 30b is formed in a circular shape having a smaller opening diameter than the first opening portion 30 a.

The inclined member 26 includes a tool attachment portion 34 on the outside of the tool holder 20, and a tool such as a boring bar 32 is attached to the tool attachment portion 34. The tool attachment portion 34 has a substantially circular disk shape, and an elastic body such as an O-ring 36 is provided between an end surface of the tool attachment portion 34 on the opposite side of the boring bar 32 and the front end surface 24 e. As shown in fig. 3, the portion of the inclined member 26 provided in the first opening portion 30a has substantially the same shape as the first opening portion 30 a.

As shown in fig. 2 and 4, the inclined member 26 includes an engagement portion 38 on the inner side of the support pin 28 in the tool holder 20 (i.e., in the second opening portion 30 b). The engaging portion 38 is formed to project in the radial direction (arrow R direction) on one flat side of the inclined member 26, and has a convex-shaped curved surface 38R curved in an R shape in the axial direction (arrow L direction).

In the outer periphery of the tool holder 20, for example, an outer peripheral ring member 40 is rotatably provided on the inner side of the support pin 28 in the rotational axis direction (arrow Lb direction) in the tool holder 20. The peripheral ring member 40 is disposed in a peripheral groove 42 formed in the outer periphery of the tool holder 20. A conversion mechanism 44 that converts the rotational motion of the outer peripheral ring member 40 into the radial tilting motion of the tilting member 26 is provided between the outer peripheral ring member 40 and the joint portion 38 of the tilting member 26.

The conversion mechanism 44 includes: a rotary screw member 46 which is offset from the rotational axis of the tool holder 20, and which engages with the inner peripheral portion of the outer peripheral ring member 40 and rotates; and a tapered member 48 to which the rotating screw member 46 is screwed, the tapered member 48 having a tapered surface 48t that is inclined in the rotational axis direction and abuts the engagement portion 38, the tapered member 48 being capable of moving forward and backward in the rotational axis direction. The rotation screw member 46 is rotatably supported on the inner end surface of the tool holder 20.

As shown in fig. 2 and 5, a gear portion 50 that rotates integrally with the rotary screw member 46 is provided in the rotary screw member 46, and one or more claw portions 52 that engage with the gear portion 50 to rotate the gear portion 50 are provided on an inner circumferential surface of the outer circumferential ring member 40. At least one engaging recess (or engaging projection) 54 for rotating the peripheral ring member 40 relative to the tool holder 20 is provided on the outer peripheral surface of the peripheral ring member 40. The joining recess 54 has a conical hole shape, but may have, for example, a circular shape, a hemispherical shape, a concave hole shape, a groove shape, or the like.

In the present embodiment, the adjustment means is formed by the conversion structure 44, the gear portion 50, and the pawl portion 52, and preferably, one gear portion 50 and one pawl portion 52 are provided. The gear portion 50 and the claw portions 52 are engaged only when the rotating action of the outer peripheral ring member 40 is performed, and the power transmission is separated between the gear portion 50 and the claw portions 52 in the normal state.

As shown in fig. 6, one or more groove portions 56 are provided on one side surface of the outer peripheral ring member 40, and ball plungers 58 that engage with the groove portions 56 to hold the outer peripheral ring member 40 at predetermined phase positions are provided in the body housing 24 of the tool holder 20. As shown in fig. 5, in the body housing 24 of the tool holder 20, one or more ball plungers 60 fitted between the teeth of the gear portion 50 are provided.

While the tapered member 48 has a rectangular shape and the tapered surface 48t abuts the engagement portion 38, as shown in fig. 4, a plurality of other surfaces such as three surfaces are supported on the inner surface of the tool holder 20. As shown in fig. 6, the tapered surface 48t is inclined inward (toward the support pin 28 side) to the front side (the arrow Lf direction) in the rotation axis direction (toward the boring bar 32 side).

As shown in fig. 4 and 6, a screw hole 62 is formed in the main body housing 24 of the tool holder 20 from the outer peripheral surface opposite to the tapered member 48. An elastic member (for example, a coil spring 64) to be abutted against the inclined member 26 to press the engaging portion 38 to the tapered surface 48t of the tapered member 48 is provided in the screw hole 62. The coil spring 64 abuts against and is held by a set screw 66 that is screwed into the screw hole 62.

As shown in fig. 1, the machine tool 10 includes a locking member, for example, a stem (engaging member) 68, which is fitted to the predetermined engaging recess 53 so as to rotate the peripheral ring member 40 relative to the tool holder 20. The stem 68 is movable forward and backward in the axial direction by a coil spring or the like (not shown), and is movable forward and backward in the radial direction with respect to the rotational axis of the tool holder 20. The stem 68 and the engagement recess 54 form an engagement mechanism.

The action of the thus formed machine tool 10 according to the present embodiment will be described below with respect to the position correction method according to the present embodiment.

When the cutting edge of the boring bar 32 is worn, the position of the boring bar 32 is adjusted (corrected) in the radially outward direction by tilting the tilting member 26 by a predetermined angle by the conversion mechanism 44.

The machine tool 10 operates automatically along program control (NC control). The peripheral ring member 40 of the machine tool 10 is coupled to the stem 68 in a particular phase by an orientation function (see fig. 7). Specifically, as shown in fig. 8, the specific engagement recess 54 of the outer peripheral ring member 40 is provided on the same axis (same phase) as the stem 68. Next, the tool holder 20 is moved in the radial direction by NC control, and the stem 68 is inserted into the engagement recess 54 (see fig. 9).

In this state, the spindle 16 is controlled and rotated by the NC control. In the NC control, the number of rotations, rotation time, and spindle orientation are set. For example, when the revolution number is 60 revolutions per minute (60RPM) and the spindle rotates for exactly one second, the spindle 16 makes one revolution (360 °) and stops (see fig. 10). Meanwhile, when a rotation command for five seconds is output, the spindle 16 makes five rotations and stops. The peripheral ring member 40 rotates substantially 360 ° (one revolution) relative to the mandrel 16 during one revolution of the mandrel 16. Therefore, the diameter of the boring bar 32 is increased by, for example, 1 μm in the radial direction (the outward arrow R direction) by the conversion mechanism 44. Meanwhile, the diameter of the boring bar 32 is increased by 5 μm in the radial direction when the spindle 16 makes five revolutions. That is, the amount of radial movement of the boring bar 32 is set by controlling the rotation time of the spindle 16.

That is, when the outer ring member 40 rotates once with respect to the tool holder 20, the claw portion 52 provided on the inner peripheral surface of the outer ring member 40 rotates in the arrow a direction as shown in fig. 11, and abuts against one tooth of the gear portion 50 to rotate the gear portion 50 in the arrow a direction. As shown in fig. 12, the gear portion 50 rotates in the arrow a direction while pressing the ball plunger 60 inward, and stops at a position of an angle θ ° at which the pawl portion 52 separates (see fig. 13). At this angular position, the gear portion 50 is held by the ball plunger 60.

The gear portion 50 is rotated by a predetermined angle θ integrally with the rotating screw member 46. Thereby, the cone member 48 to which the gear portion 50 is screwed moves to one side in the rotational axis direction (in the arrow Lb direction or the arrow Lf direction). At this time, as shown in fig. 14, by changing the height position of the tapered surface 48t, the joint portion 38 abutting against the tapered surface 48t of the tapered member 48 is displaced inward in the radial direction (arrow R direction) of the tool holder 20. Accordingly, the inclined member 26 is rotated in the arrow B direction with the support pin 28 as a support point, and the boring bar 32 is corrected in the radially outward direction by a predetermined movement amount (e.g., 1 μm). While the outer circumferential ring member 40 makes one rotation, the boring bar 32 moves in the radial direction by, for example, 2 μm or 3 μm.

By rotating the peripheral ring member 40 by a predetermined number, the blade position of the boring bar 32 is set at a desired position in the radial direction. When the outer peripheral ring member 40 is rotated in one direction, the boring bar 32 is adjusted in a radially outward direction (in a direction of increasing diameter). Meanwhile, the boring bar 32 is adjusted in a radially inward direction (in a direction of decreasing diameter) while the outer peripheral ring member 40 is rotated in the other direction. Although the rotating operation of the outer peripheral ring member 40 is automatically corrected by the NC control, the rotating operation may also be performed by a manual operation.

In the boring, so-called positive correction is performed in which the blade position is adjusted in a direction to increase the diameter by the amount of diameter reduction due to wear. After the positive correction of several μm is repeatedly performed and when the blade reaches the wear limit, the corrected state is restored to zero, that is, the peripheral ring member 40 is rotated in the reverse direction (the direction of reverse correction), and a new blade is installed.

In this case, in the present embodiment, when the outer peripheral ring member 40 is rotated with respect to the tool holder 20, the rotation screw member 46 offset from the rotation axis of the tool holder 20 is rotated. The rotary screw member 46 is screwed to the tapered member 48, and the tapered member 48 is moved in the rotational axis direction of the tool holder 20 by the rotating operation of the rotary screw member 46.

At this time, the engaging portion 38 of the inclined member 26 abuts against the tapered surface 48t of the tapered member 48. When the tapered member 48 is moved in the rotation axis direction, the engaging portion 38 is displaced in the radial direction of the tool holder 20 along the inclination of the tapered surface 48 t. Accordingly, the inclined member 26 is inclined on the support pin 28 in the radial direction (arrow R direction) of the tool rest 20, so that the boring bar 32 can be corrected and moved.

Also, as shown in fig. 2 and 5, one or more claw portions 52 are provided in the inner peripheral portion of the outer peripheral ring member 40, and a gear portion 50 that is engaged with the claw portions 52 and rotates integrally with the rotating screw member 46 is provided in the rotating screw member 46. Therefore, with a simple configuration, one rotation action of the outer peripheral ring member 40 can be converted into a turning action of a predetermined angle θ ° of the rotation screw member 46, and then easily converted into an axial moving action of the tapered member 48.

Thus, it is possible to obtain an effect of correcting the position of the boring bar 32 attached to the tool holder 20 in the radial direction of the tool holder 20 with high accuracy and high resolution on the order of micrometers in a simple and compact configuration.

As shown in fig. 2 and 4, an elastic member (for example, a coil spring 64) to be abutted with the inclined member 26 to press the engaging portion 38 to the tapered surface 48t of the tapered member 48 is provided in the tool holder 20. Therefore, the engaging portion 38 of the inclined member 26 can always abut against the tapered surface 48t, and the inclined member 26 can be reliably inclined.

As shown in fig. 5, the tool holder 20 is provided with ball plungers 60 fitted between the teeth of the gear portion 50. Thus, the gear portion 50 can be reliably held at the predetermined angle θ ° by one rotation of the outer peripheral ring member 40, so that highly accurate correction is performed.

While the tapered member 48 has a rectangular shape and the tapered face 48t abuts the engagement portion 38 as shown in fig. 4, a plurality of other surfaces such as three surfaces are supported on the inner surface of the tool holder 20. Therefore, when the rotary screw member 46 is rotated, the taper member 48 is not rotated, so that the taper member 48 can be smoothly and reliably moved only in the direction of the rotation axis.

Further, the engaging portion 38 has a convex-shaped curved surface 38R that abuts against the tapered surface 48t of the tapered member 48. Therefore, the engaging portion 38 makes line contact with the tapered surface 48t of the tapered member 48. Thereby, even when the tilting member 26 performs the tilting action with the support pin 28 as a fulcrum, a stable line contact state can be ensured.

Further, as shown in fig. 6, one or more groove portions 56 are provided on one side surface of the outer peripheral ring member 40, and ball plungers 58 that engage with the groove portions 56 to hold the outer peripheral ring member 40 are provided in the tool holder 20. Thus, the outer peripheral ring member 40 is reliably held at a predetermined phase at all times. Further, when the outer peripheral ring member 40 is manually operated, it is possible to easily sense that the outer peripheral ring member 40 is disposed at the predetermined phase, and prevent the outer peripheral ring member 40 from being rotated beyond the predetermined phase position.

At least one engaging recess (or engaging projection) 54 for rotating the peripheral ring member 40 relative to the tool holder 20 is provided on the outer peripheral surface of the peripheral ring member 40. Therefore, the outer peripheral ring member 40 is rotated only by using the stem 68, and automatic correction of the boring bar 32 is performed well with simple NC control.

Further, in the present embodiment, the amount of radial movement of the boring bar 32 is set by controlling the rotation time of the spindle 16. Therefore, for example, the amount of movement of the boring bar 32 is accurately set only by rotating the spindle 16 once or twice.

Industrial applicability

With the work machine having the position correcting function according to the present invention, it is possible to correct the position of the tool attached to the tool holder in the radial direction of the tool holder with high accuracy and high resolution on the order of micron with a simple and compact configuration. Also, with the position correction method of a work machine having a position correction function according to the present invention, the radial movement amount of the tool is set by controlling the rotation time of the spindle. Thus, for example, the amount of movement of the tool is accurately set by only rotating the spindle one or two times.

List of reference numerals

10: machine tool

14: mandrel shell

16: mandrel

20: tool rack

24: main body shell

26: tilting member

28: support pin

32: boring bar

34: tool attachment

38: joint part

40: peripheral ring member

44: switching mechanism

46: rotary screw member

48: conical member

50: gear part

52: claw part

Claims

1. A work machine having a position correction function, the work machine comprising:

a tool holder capable of rotating integrally with the spindle;

an inclined member mounted on an end portion of the tool holder on an opposite side of the spindle via a fulcrum portion in such a manner as to be tiltable in a radial direction intersecting a rotational axis direction of the tool holder, the inclined member including an engaging portion located on an inner side of the tool holder than the fulcrum portion, a tool being attached to the inclined member outside the tool holder;

an engagement mechanism engageable with a peripheral ring member rotatably provided on an outer periphery of the tool holder by moving forward and backward in the radial direction with respect to a rotation shaft of the tool holder; and

an adjusting device that corrects a position of the tool mounted on the tool holder in the radial direction of the tool holder by rotating the peripheral ring member with respect to the tool holder in a state where the engaging mechanism is engaged with the peripheral ring member, wherein,

the adjusting device comprises:

one or more claw portions provided at an inner peripheral portion of the outer peripheral ring member;

one or more gear portions provided offset from the rotational axis of the tool holder, the gear portions being engaged with the claw portions and rotated only when the outer peripheral ring member performs a rotating action; and

a conversion mechanism that converts a rotational motion of the gear portion into a radial tilting motion of the tilting member, and

the conversion mechanism includes:

a rotary screw member that is offset from the rotary shaft and rotates integrally with the gear portion; and

a tapered member to which the rotating screw member is screwed, the tapered member including a tapered surface that is inclined in the rotation axis direction and abuts the engagement portion, the tapered member being movable forward and backward in the rotation axis direction.

2. The work machine with the position correcting function according to claim 1, wherein an elastic member to be abutted with the inclined member to press the engagement portion to the tapered surface is provided on the tool holder.

3. The work machine with the position correcting function according to claim 1, wherein a ball plunger fitted between the teeth of the gear portion is provided on the tool holder.

4. The work machine with a position correcting function according to claim 1, wherein the tapered member has a rectangular shape and the tapered surface abuts the engaging portion, while a plurality of other surfaces of the tapered member are supported on an inner surface of the tool holder.

5. The work machine with the position correcting function according to claim 1, wherein the engagement portion has a convex curved surface that abuts against the tapered surface.

6. The work machine with a position correcting function according to claim 1, wherein one or more groove portions are provided on one side surface of the outer peripheral ring member, and

a ball plunger is provided on the tool holder that engages with the groove portion to retain the peripheral ring member.

7. The work machine with a position correcting function according to claim 1, wherein the engagement mechanism includes:

an engagement recess or an engagement projection provided on an outer peripheral surface of the outer peripheral ring member; and

an engagement member engaged with the engagement recess or the engagement projection to rotate the peripheral ring member relative to the tool holder.

8. A position correction method for a working machine having a position correction function, the working machine comprising:

a tool holder capable of rotating integrally with the spindle;

the adjusting device comprises:

the conversion mechanism includes:

a tapered member to which the rotating screw member is screwed, the tapered member including a tapered surface that is inclined in the rotation axis direction and abuts the engagement portion, the tapered member being movable forward and backward in the rotation axis direction,

in the position correction method,

performing a radial tilting action of the tilting member by the conversion mechanism one or more times by rotating the spindle one revolution in a state where the outer peripheral ring member is non-rotatably held by the engagement mechanism, and

the amount of radial movement of the inclined member is set by controlling the rotation time of the spindle.