JP2017071019A - Rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool which can discharge air without using an air supply source.SOLUTION: A rotary tool 1 includes a holding part 2, a shaft part 3, a protrusion part 4, a suction port 5, a fluid passage 6, and a discharge port 7. The holding part 2 can be attached to a main shaft 100 of a rotating machine. The shaft part 3 extends from the hold part 2 in a rotation axis direction. The protrusion part 4 protrudes to a radial outer side from the shaft part 3. The suction port 5 is arranged in a rotation direction of the protrusion part 4. The fluid passage 6 communicates with the suction port 5, and extends on an inner side of the shaft part 3. The discharge port 7 communicates with the fluid passage 6 and is arranged on an end part opposite to the holding part 2 of the shaft part 3. Thereby, when the rotary tool 1 rotates together with the main shaft 100 of the rotating machine, air taken in the suction port 5 passes through the fluid passage 6, and is discharged from the discharge port 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary tool attached to a main shaft of a rotating machine.

2. Description of the Related Art Conventionally, a rotary tool that is attached to a main shaft of a rotary machine such as a cutting machine is known.
The rotary tool described in Patent Document 1 performs deburring of an inner wall of a hole in a workpiece with a cutting tool attached to a cylindrical main body. This rotary tool is configured such that air is supplied from an external air supply source through an air pipe to an air passage provided inside the cylindrical main body. The air supplied to the air passage is ejected from the gap between the cylindrical main body and the cutting tool. Thereby, this rotary tool can remove the chips generated when deburring the workpiece.

JP 2014-124699 A

However, since the rotary tool described in Patent Document 1 has a configuration in which air is supplied from an external air supply source through an air pipe, the equipment for installing the rotary tool is complicated, and the equipment is increased in size. There's a problem.
This invention is made | formed in view of the above-mentioned point, and it aims at providing the rotary tool which can discharge air, without using an air supply source.

  The rotary tool of the present invention includes a gripping portion, a shaft portion, an overhang portion, a suction port, a fluid passage, and a discharge port. The grip portion can be attached to the main shaft of the rotating machine. The shaft portion extends from the grip portion in the direction of the rotation axis. The overhanging portion projects radially outward from the shaft portion. The suction port is provided in the rotation direction of the overhanging portion. The fluid passage communicates with the suction port and extends inside the shaft portion. The discharge port communicates with the fluid passage and is provided at an end portion of the shaft portion opposite to the grip portion.

  Thereby, when a rotary tool rotates with the main axis | shaft of a rotary machine, the air around a shaft part is taken in into an inlet. The air passes through the fluid passage from the suction port and is discharged from the discharge port. Therefore, this rotary tool can discharge air using the power of the rotating machine without using an air supply source such as a compressor.

It is a perspective view of the rotary tool by 1st Embodiment of this invention. It is sectional drawing containing the rotating shaft of a rotary tool in the II-II line | wire of FIG. It is sectional drawing of the III-III line of FIG. It is a side view of the rotary tool by 2nd Embodiment of this invention. It is an arrow view of the V direction of FIG. It is a top view of the rotary tool by 3rd Embodiment of this invention. It is an arrow view of the VII direction of FIG. It is an arrow directional view of the VIII direction of FIG. It is a perspective view of the rotary tool by 4th Embodiment of this invention. It is sectional drawing containing the rotating shaft of a rotary tool in the XX line of FIG. It is sectional drawing of the rotary tool by 5th Embodiment of this invention. It is a perspective view of the rotary tool by 6th Embodiment of this invention. It is a perspective view of the rotary tool by 7th Embodiment of this invention. It is a perspective view of the rotary tool by 8th Embodiment of this invention. It is sectional drawing containing the rotating shaft of a rotary tool in the XV-XV line | wire of FIG. It is sectional drawing of the XVI-XVI line | wire of FIG.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A first embodiment of the present invention is shown in FIGS. The rotary tool 1 according to the first embodiment is used by being attached to a main shaft 100 of a cutting machine as a rotary machine. The rotary tool 1 is used, for example, for removing chips accumulated inside a hole after forming a hole in a workpiece (not shown) by cutting or the like.

  The rotary tool 1 includes a configuration such as a grip portion 2, a shaft portion 3, an overhang portion 4, a suction port 5, a fluid passage 6, and a discharge port 7. The rotary tool 1 is configured such that, for example, by a metal 3D printer, their configurations are continuously and integrally made of the same material. The metal 3D printer has a space that is curved inward, for example, by a powder sintering method in which fine metal powder laid flat is irradiated with a laser to sinter one layer at a time and this process is repeated to form a three-dimensional structure. It is possible to form products of various shapes.

The grip portion 2 is formed in a columnar shape and can be attached to a chuck provided on the main shaft 100 of the cutting machine. Thereby, the rotary tool 1 can rotate with the main axis | shaft 100 of a cutting machine.
The shaft portion 3 extends from the grip portion 2 in the rotation axis direction. The shaft portion 3 includes a cylindrical portion 8 connected to the grip portion 2 and a tapered portion 9 provided on the opposite side of the grip portion 2 with respect to the cylindrical portion 8.

The outer diameter of the cylindrical portion 8 is smaller than the outer diameter of the grip portion 2. Therefore, a stepped portion 10 is provided at a connection portion between the cylindrical portion 8 and the grip portion 2.
The taper portion 9 has a shape in which the outer diameter gradually decreases from the cylindrical portion 8 toward the side opposite to the grip portion 2. Thereby, it is possible to insert the tip of the tapered portion 9 into the inside of the hole formed in the workpiece, and to remove the chips accumulated inside the hole.

The overhanging portion 4 protrudes radially outward from the cylindrical portion 8 of the shaft portion 3. Further, the overhanging portion 4 protrudes outward in the radial direction from the outer diameter of the grip portion 2. In FIG. 3, the boundary line between the overhanging portion 4 and the cylindrical portion 8 is indicated by a two-dot chain line B. However, this boundary line is described for convenience of explanation, and as described above, the overhanging portion 4 and the cylindrical portion 8 are formed continuously and integrally.
The overhang | projection part 4 is provided in angle range (theta) 1 larger than 90 degrees in the cross sectional view perpendicular | vertical to the rotating shaft O. FIG. The shape of the overhanging portion 4 and the angle range θ1 where the overhanging portion 4 is provided can be arbitrarily set.

  As shown in FIGS. 1 and 2, the outer wall on the radially outer side of the grip portion 2 has a substantially arc shape that protrudes outward in a cross-sectional view parallel to the rotation axis O. The outer wall on the outer side in the radial direction of the grip portion 2 is directed from the front side to the rear side in the rotation direction, and the width in the rotation axis direction is gradually reduced. In addition, the grip portion 2 side of the overhang portion 4 is connected to the step portion 10.

The suction port 5 is provided on the front side of the overhanging portion 4 in the rotation direction. The suction port 5 functions as an air intake port that takes in air around the rotary tool 1 when the rotary tool 1 rotates.
The fluid passage 6 communicates with the suction port 5 and extends inside the overhang portion 4 and the shaft portion 3. The fluid passage 6 has a swirl flow path 11 provided mainly inside the overhanging portion 4 and an axial flow path 12 provided inside the shaft portion 3.

The swirl flow path 11 is provided so as to swirl around the rotation axis O from the suction port 5. As shown in FIG. 2, the swirl flow path 11 is provided so that the cross-sectional area of the flow path gradually decreases from the suction port 5 toward the axial flow path 12 side. The swirl flow path 11 has a shape close to a substantially semicircular shape protruding outward in a cross-sectional view parallel to the rotation axis O.
As shown in FIG. 3, the swirl flow path 11 is provided in an angle range θ2 larger than 90 ° in a cross-sectional view perpendicular to the rotation axis O. The shape of the swirl flow path 11 and the angle range θ2 where the swirl flow path 11 is provided can be arbitrarily set.

  The axial flow path 12 extends from the swirl flow path 11 to the discharge port 7 in the rotation axis direction. The rotation axis O of the shaft portion 3 and the central axis of the axial flow path 12 coincide. The axial flow path 12 has a tapered shape in which the flow path cross-sectional area gradually decreases from the swirl flow path 11 side toward the discharge port 7. That is, the fluid passage 6 extends from the suction port 5 to the discharge port 7, and both the swirl flow path 11 and the axial flow path 12 are provided so that the flow path cross-sectional area gradually decreases. Therefore, the fluid passage 6 having the swirl flow path 11 and the axial flow path 12 can increase the pressure of air taken from the suction port 5.

  The discharge port 7 is provided at the end of the shaft 3 opposite to the grip 2. The opening area of the discharge port 7 is smaller than the opening area of the suction port 5. Accordingly, the discharge port 7 can discharge the air taken in from the suction port 5 and pressurized by the fluid passage 6.

The first embodiment has the following operational effects.
(1) When the rotary tool 1 of the first embodiment rotates together with the main shaft 100 of the rotating machine, the air around the shaft portion 3 is taken into the suction port 5. The air passes through the fluid passage 6 from the suction port 5 and is discharged from the discharge port 7. Therefore, this rotary tool 1 can discharge air with the power of a rotary machine, without using air supply sources, such as a compressor, for example.

(2) The overhang portion 4 of the first embodiment overhangs radially outward from the grip portion 2.
As a result, the amount of air taken into the suction port 5 increases. Therefore, the rotary tool 1 can increase the amount of air discharged from the discharge port 7.

(3) In the first embodiment, the opening area of the discharge port 7 is smaller than the opening area of the suction port 5.
Thereby, the discharge port 7 can increase the air pressure discharged from the discharge port 7.

(4) In the first embodiment, the fluid passage 6 is provided so that the flow path cross-sectional area gradually decreases from the suction port 5 toward the discharge port 7.
Thereby, the fluid passage 6 can pressurize the air flowing through the fluid passage 6.

(5) In the first embodiment, the fluid passage 6 includes the swirl passage 11 and the axial passage 12. The swirl flow path 11 is provided so as to swirl around the rotation axis O from the suction port 5. The axial flow path 12 extends in the rotation axis direction from the swirl flow path 11 to the discharge port 7.
As a result, the rotary tool 1 can change the flow of air flowing in the rotation direction of the rotation axis O in the turning flow path 11 to the rotation axis direction by the shaft flow path 12 and discharge the air from the discharge port 7 in the rotation axis direction. Is possible.

(6) In the first embodiment, the overhang portion 4 is provided in an angle range θ1 larger than 90 ° in a cross-sectional view perpendicular to the rotation axis O. Further, the swirl passage 11 provided inside the overhanging portion 4 is also provided in an angle range θ2 larger than 90 ° in a cross-sectional view perpendicular to the rotation axis O.
Thereby, since the distance of the turning flow path 11 becomes long, the cross-sectional area of the flow path can be gradually reduced. Therefore, the swirl flow path 11 can pressurize the air taken into the suction port 5 and quickly flow it to the axial flow path 12.

(7) In the first embodiment, the swirling channel 11 is provided so that the channel cross-sectional area gradually decreases from the suction port 5 toward the axial channel 12 side.
Thereby, the fluid resistance of the air which flows through the turning flow path 11 reduces. Therefore, the swirl flow path 11 can pressurize the air flowing therethrough.

(8) In 1st Embodiment, the axial flow path 12 is provided in the taper shape from which the flow-path cross-sectional area becomes small gradually toward the discharge port 7 from the turning flow path 11 side.
Thereby, the fluid resistance of the air which flows through the axial flow path 12 reduces. Therefore, the axial flow path 12 can pressurize the air flowing therethrough.

(9) In 1st Embodiment, the level | step-difference part 10 and the overhang | projection part 4 which were provided in the connection location of the holding part 2 and the shaft part 3 are connected.
Thereby, the rotary tool 1 can increase the rigidity of the overhanging portion 4.

(Second Embodiment)
A second embodiment of the present invention is shown in FIGS. Note that, in a plurality of embodiments described below, the same reference numerals are given to substantially the same configurations as those in the first embodiment described above, and the description will be omitted.
In the rotary tool 1 of the second embodiment, two projecting portions 4 are disposed in the rotational axis direction on the radially outer side of the shaft portion 3. Suction ports 5 are respectively provided on the front side in the rotational direction of the two overhanging portions 4. That is, the two suction ports 5 are both disposed in the direction of the rotation axis of the shaft portion 3.
In the second embodiment, it is possible to increase the amount of air taken into the fluid passage 6 from the suction ports 5 by increasing the number of the suction ports 5 in the rotation axis direction of the shaft portion 3. Therefore, the air pressure discharged from the discharge port 7 can be increased. In the second embodiment, the number of the overhang portions 4 and the number of the suction ports 5 can be arbitrarily set.

(Third embodiment)
A third embodiment of the present invention is shown in FIGS. In the rotary tool 1 of the third embodiment, four projecting portions 4 are arranged in the rotational direction on the radially outer side of the shaft portion 3. As shown in FIG. 7, the four overhang portions 4 are disposed at the same position in the rotation axis direction.
A suction port 5 is provided on each of the four overhanging parts 4 on the front side in the rotational direction. That is, the four suction ports 5 are arranged in the rotation direction of the shaft portion 3. Further, the four suction ports 5 are disposed at the same position in the rotation axis direction. The fluid passage 6 communicating with the four suction ports 5 communicates with the inside of the shaft portion 3 and further communicates with the discharge port 7.
Also in the third embodiment, it is possible to increase the amount of air taken into the fluid passage 6 from the suction ports 5 by increasing the number of the suction ports 5 in the rotation direction of the shaft portion 3. Therefore, the air pressure discharged from the discharge port 7 can be increased. In the third embodiment, the number of the overhang portions 4 and the number of the suction ports 5 can be arbitrarily set.

(Modification of the third embodiment)
The modification of 3rd Embodiment mentioned above is shown in FIG. 6 and FIG. In the modification of the third embodiment, the four overhang portions 4 arranged in the rotation direction of the shaft portion 3 are arranged at positions shifted in the rotation axis direction. Specifically, each of the four overhanging portions 4 includes one predetermined overhanging portion 4 and one overhanging portion 4 at a position that is 90 ° different from the predetermined overhanging portion 4 in the rotational direction. The overhanging portion 4 is disposed at a position shifted in the vertical direction by a distance half the distance in the rotation axis direction.
Also in the modified example of the third embodiment, the suction ports 5 are provided on the front side in the rotational direction of the four overhang portions 4. That is, the four suction ports 5 are arranged at positions shifted in the direction of the rotation axis of the shaft portion 3. The fluid passage 6 communicating with the four suction ports 5 communicates with the inside of the shaft portion 3 and further communicates with the discharge port 7.

(Fourth embodiment)
A fourth embodiment of the present invention is shown in FIGS. The rotary tool 1 according to the fourth embodiment includes an attachment portion 14 to which a cutting tool 13 can be attached to the shaft portion 3. The attachment portion 14 is a concave portion that is recessed in a cylindrical shape from the distal end side of the shaft portion 3 to the grip portion 2 side. The cutting tool 13 is attached to the inside of the attachment portion 14 by shrink fitting, for example. The attachment part 14 can attach and detach the cutting tool 13 by heating and cooling of the shaft part 3. Note that a grinding tool may be attached to the attachment portion 14 instead of the cutting tool 13.

  In the fourth embodiment, a plurality of discharge ports 7 are provided on the outer side in the radial direction of the attachment portion 14 at the end of the shaft portion 3 opposite to the grip portion 2. The axial flow path 12 included in the fluid passage 6 is branched into a plurality of tributaries 15 inside the shaft portion 3. The plurality of tributaries 15 communicate with the corresponding plurality of discharge ports 7. Thereby, the air taken into the fluid passage 6 from the suction port 5 is discharged from the plurality of discharge ports 7. Therefore, the rotary tool 1 of the fourth embodiment can remove chips and the like generated from the workpiece during machining with the cutting tool 13 or the grinding tool from the workpiece by the air discharged from the discharge port 7. is there.

(Fifth embodiment)
FIG. 11 shows a fifth embodiment of the present invention. The rotary tool 1 of 5th Embodiment respond | corresponds to the cutting tool 13 which has the through hole 16 connected to an axial direction. The discharge port 7 of the rotary tool 1 is provided in the deep part of the attachment part 14. Thereby, the air taken into the suction port 5 passes through the through hole 16 of the cutting tool 13 from the discharge port 7 and is discharged from the tip of the cutting tool 13. Therefore, also in the rotary tool 1 of the fifth embodiment, it is possible to remove chips and the like generated from the workpiece during processing by the cutting tool 13 and the like by air discharged from the through hole 16.

(Sixth embodiment)
A sixth embodiment of the present invention is shown in FIG. As for the rotary tool 1 of 6th Embodiment, the shaft part 3 is formed in the column shape. A plurality of blades 17 are attached to the outer wall on the radially outer side of the shaft portion 3. Further, the discharge port 7 of the rotary tool 1 is provided at the tip of the shaft portion 3. Also in the sixth embodiment, it is possible to remove chips and the like generated from the workpiece during processing by the plurality of blades 17 with the air discharged from the discharge port 7.

(Seventh embodiment)
A seventh embodiment of the present invention is shown in FIG. The rotary tool 1 according to the seventh embodiment includes a plurality of ribs 18 on the inner wall of the swirl passage 11 included in the fluid passage 6. The plurality of ribs 18 are provided so as to turn while being inclined toward the tip end side of the shaft portion 3 from the suction port 5 side toward the axial flow path 12 side.
Thereby, when the rotary tool 1 rotates, the air flowing through the swirl flow path 11 is pushed into the axial flow path 12 along the ribs 18. Therefore, the rotary tool 1 of the seventh embodiment can increase the air pressure discharged from the discharge port 7 by the plurality of ribs 18.

In the seventh embodiment, the number of ribs 18 can be arbitrarily set.
In the seventh embodiment, the rib 18 may be provided on the inner wall of the axial flow path 12.
Furthermore, in the seventh embodiment, instead of providing the rib 18 on the inner wall of the swirling flow path 11 or the axial flow path 12, a groove may be provided on the inner wall of the swirling flow path 11.

(Eighth embodiment)
An eighth embodiment of the present invention is shown in FIGS. In FIG. 15, each boundary line of the grip part 2, the cylindrical part 8, the taper part 9, and the overhang part 4 is indicated by a two-dot chain line B. In FIG. 16, the boundary line between the overhang part 4 and the shaft part 3 is illustrated. This is indicated by a two-dot chain line B. However, this boundary line is described for convenience of explanation, and as described above, the rotary tool 1 is configured continuously and integrally from the same material.

  The shaft portion 3 has a cylindrical portion 8 and a tapered portion 9. The outer diameter of the cylindrical portion 8 is smaller than the outer diameter of the grip portion 2. Further, the outer diameter of the tapered portion 9 is larger than the outer diameter of the cylindrical portion 8. Therefore, a first step portion 10 is provided at a connection portion between the grip portion 2 and the column portion 8, and a second step portion 19 is provided at a connection portion between the column portion 8 and the taper portion 9.

The overhanging portion 4 protrudes radially outward from the cylindrical portion 8 of the shaft portion 3. However, the overhang | projection part 4 of 8th Embodiment is an outer diameter substantially the same as the holding part 2 also in the location 41 where the outer diameter is the largest. The suction port 5 is provided on the front side in the rotational direction of the portion 41 where the outer diameter of the overhang portion 4 is the maximum.
As shown in FIGS. 14 and 15, the outer diameter of the grip portion 2, the maximum outer diameter of the overhang portion 4, and the outer diameter of the taper portion 9 are substantially the same. The overhanging portion 4 is connected to the first stepped portion 10 on the gripping portion 2 side, and the tapered portion 9 side of the overhanging portion 4 is connected to the second stepped portion 19.

As shown in FIG. 16, the overhanging portion 4 is provided in an angular range θ3 of approximately 360 ° in a cross-sectional view perpendicular to the rotation axis O. The overhang | projection part 4 is provided so that the outer diameter may become small gradually toward the rotation direction rear side from the location 41 where the outer diameter is the largest.
The fluid passage 6 communicates with the suction port 5 and extends inside the overhang portion 4 and the shaft portion 3. The fluid passage 6 includes a swirl passage 11 provided inside the overhanging portion 4 and the cylindrical portion 8, and an axial passage 12 provided mainly inside the taper portion 9.

The swirl flow path 11 swivels around the rotation axis O from the suction port 5 in a cross-sectional view perpendicular to the rotation axis O, and is provided in an angular range θ4 of approximately 450 °. The swirl flow path 11 is provided so that the cross-sectional area of the flow path gradually decreases from the suction port 5 toward the axial flow path 12 side. Therefore, the fluid passage 6 can pressurize the air taken from the suction port 5 by the swirl flow path 11.
In addition, the shape of the overhang | projection part 4 and the turning flow path 11, and angle ranges (theta) 3 and (theta) 4 which provide the overhang | projection part 4 and the turning flow path 11 can be set arbitrarily.

The axial flow path 12 extends from the swirl flow path 11 to the discharge port 7 in the rotation axis direction. The axial channel 12 has the same channel cross-sectional area from the swirl channel 11 side toward the discharge port 7. The air taken into the swirl flow path 11 from the suction port 5 flows through the axial flow path 12 in a pressurized state, and is discharged from the discharge port 7.
Also in the eighth embodiment, the rotary tool 1 can discharge air by the power of the rotating machine without using an air supply source such as a compressor.

(Other embodiments)
(1) In embodiment mentioned above, the rotary tool 1 shall be attached to the cutting machine as a rotary machine. On the other hand, in other embodiments, the rotary tool 1 may be used by being attached to a hand-held processing machine as a rotating machine or a grinding machine.

(2) In the above-described embodiment, the discharge port 7 of the rotary tool 1 is provided in the axial direction of the shaft portion 3. On the other hand, in another embodiment, the discharge port 7 of the rotary tool 1 may be provided in the radial direction of the shaft portion 3.

(4) In the above-described embodiment, the outer diameter of the shaft portion 3 is smaller than the outer diameter of the grip portion 2. On the other hand, in other embodiments, the outer diameter of the shaft portion 3 may be the same as the outer diameter of the grip portion 2 or larger than the outer diameter of the grip portion 2.

(5) In the embodiment described above, the rotary tool 1 is formed by a metal 3D printer. On the other hand, in other embodiment, after forming the member which divided | segmented the rotary tool 1 in the predetermined position by cutting etc., you may form by joining these members integrally.
Thus, the present invention is not limited to the above-described embodiments, and can be implemented in various forms within the scope of the invention in addition to combining the above-described plurality of embodiments.

DESCRIPTION OF SYMBOLS 1 ... Rotary tool 2 ... Holding part 3 ... Shaft part 4 ... Overhang | projection part 5 ... Suction port 6 ... Fluid passage 7 ... Discharge port 100 ... Spindle

Claims (14)

A rotating tool that rotates with the main shaft (100) of the rotating machine,
A grip portion (2) attachable to the main shaft;
A shaft portion (3) extending in the rotation axis direction from the gripping portion;
An overhanging portion (4) projecting radially outward from the shaft portion;
A suction port (5) provided in the rotation direction of the overhang;
A fluid passage (6) communicating with the suction port and extending inside the shaft portion;
A rotary tool comprising: a discharge port (7) provided in an end portion of the shaft portion that is in communication with the fluid passage and opposite to the grip portion of the shaft portion.   The rotary tool according to claim 1, wherein the projecting portion projects outward in the radial direction from the gripping portion.   The rotary tool according to claim 1 or 2, wherein an opening area of the discharge port is smaller than an opening area of the suction port.   The rotary tool according to any one of claims 1 to 3, wherein the fluid passage is provided so that a cross-sectional area of the flow path gradually decreases from the suction port to the discharge port. The fluid passage is
A swirl flow path (11) provided to swirl around a rotation axis from the suction port;
The rotary tool according to any one of claims 1 to 4, further comprising: an axial flow path (12) extending in a rotation axis direction from the swirl flow path to the discharge port.   The rotary tool according to claim 5, wherein the swirl flow path is provided so that a cross-sectional area of the flow path gradually decreases from the suction port side toward the axial flow path side. The projecting portion is provided in an angle range (θ1) larger than 90 ° in a cross-sectional view perpendicular to the rotation axis.
The rotary tool according to claim 5 or 6, wherein the swirl flow path is also provided on the inner side of the projecting portion in an angle range (θ2) larger than 90 ° in a cross-sectional view perpendicular to the rotation axis.   The rotary tool according to any one of claims 5 to 7, wherein the axial channel has a tapered shape in which a channel cross-sectional area gradually decreases from the swirl channel side to the discharge port side.   A rib (18) or a groove provided on an inner wall of the fluid passage and provided so as to turn while tilting from the suction port side toward the discharge port side toward the tip end side of the shaft portion. The rotary tool according to any one of 1 to 8. The outer diameter of the grip portion is larger than the outer diameter of the shaft portion,
The rotary tool according to any one of claims 1 to 9, wherein a stepped portion (10) provided at a connection portion between the grip portion and the shaft portion is connected to the projecting portion. A plurality of the overhang portions are provided in the rotation axis direction on the radially outer side of the shaft portion,
The rotary tool according to claim 1, wherein the suction port is provided in each of the plurality of overhang portions. A plurality of the overhang portions are provided in the rotational direction on the radially outer side of the shaft portion,
The rotary tool according to any one of claims 1 to 11, wherein the suction port is provided in each of the plurality of overhang portions.   The rotary tool according to any one of claims 1 to 12, further comprising an attachment portion (14) to which a cutting tool (13) or a grinding tool can be attached to the shaft portion.   The rotary tool according to any one of claims 1 to 13, wherein the grip portion, the shaft portion, and the overhang portion are configured integrally and continuously from the same material.

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