JP7331250B2 - Drilling device and drilling method - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a drilling device and a drilling method for drilling a workpiece in which a plurality of workpieces are stacked.

2. Description of the Related Art Conventionally, there is known a device for removing cutting debris generated by a cutting tool that performs a cutting operation such as drilling a workpiece (see, for example, Patent Document 1). U.S. Patent No. 5,200,000 discloses connecting a vacuum source to an exhaust channel of a chamber formed by a body that adheres to a workpiece, through which cutting debris is evacuated along with the fluid in the chamber. In Patent Document 1, an inlet opening through which a cutting tool is inserted into a main body is closed with a disc, so that an air flow is introduced from a supply channel, and cutting fragments are discharged from an exhaust channel together with the air flow circulated in a cyclone in a chamber. Discharge.

Japanese Patent No. 5171826

In Patent Document 1, since the cutting chips are discharged from the exhaust channel together with the airflow circulated in a cyclone in the chamber, relatively short cutting chips existing in the chamber without adhering to the cutting tool are discharged from the exhaust channel. can be discharged.
However, in Patent Literature 1, it is difficult to reliably remove relatively long cutting pieces adhering to the grooves of the cutting tool. Therefore, there is a possibility that the cutting tool will operate while the relatively long cutting pieces remain attached, and the cutting pieces will damage the workpiece.

The present disclosure has been made in view of such circumstances, and it is possible to remove cutting chips adhering to the groove of a drill included in a drilling part and prevent the workpiece from being damaged by the cutting chips. An object of the present invention is to provide a drilling device and a drilling method.

A drilling device according to an aspect of the present disclosure is a drilling device for drilling a workpiece in which a plurality of workpieces are stacked, the drilling device being formed in a cylindrical shape extending along an axis and having a first end of the workpiece. a first support that supports one surface; a second support that is formed in a cylindrical shape extending along the axis and supports a second surface of the processed portion; and a portion, wherein the drilling portion includes a drill having a circular cross-sectional shape orthogonal to the axis and having a groove formed on an outer peripheral surface thereof to rotate along the axis, and rotating the drill around the axis. and a drive mechanism for moving the drill inside the first support along the axis so as to contact or separate from the first surface of the workpiece, wherein the first support is a discharge part for discharging a gas toward a predetermined position on the outer peripheral surface of the drill for removing chips generated by the drilling of the workpiece by the drilling part from the groove of the drill; a suction part for sucking scraps together with gas, wherein the discharge part sucks gas in a direction coinciding with a tangential direction of the outer peripheral surface passing through the predetermined position when the drill is viewed from above along the axis. to dispense.

A drilling method according to an aspect of the present disclosure is a drilling method for drilling a workpiece in which a plurality of workpieces are stacked, wherein the first support body formed in a tubular shape extending along an axis line allows the above-mentioned a supporting step of supporting the first surface of the portion to be processed and supporting the second surface of the portion to be processed by a second support formed in a cylindrical shape extending along the axis; and a cross-sectional shape perpendicular to the axis. and a drilling step of drilling the workpiece with a drill having a circular groove formed on an outer peripheral surface thereof, the groove rotating along the axis, wherein the drilling step is performed centering on the axis. rotating the drill and moving the drill along the axis within the first support so as to contact the first surface of the workpiece; from the groove of the drill is discharged from the discharge portion of the first support toward a predetermined position on the outer peripheral surface of the drill, and the gas is discharged to the suction portion of the first support. The cutting chips are sucked together with the gas, and the discharge part discharges the gas in a direction coinciding with the tangential direction of the outer peripheral surface passing through the predetermined position when the drill is viewed from above along the axis.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a drilling device and a drilling method capable of removing shavings adhering to the groove of a drill of a drilling section and preventing the workpiece from being damaged by the shavings.

FIG. 4 is a perspective view showing stringers and clips; 1 is a schematic configuration diagram showing a punching device according to a first embodiment of the present disclosure; FIG. 1 is a longitudinal sectional view showing a punching device according to a first embodiment of the present disclosure; FIG. FIG. 4 is a cross-sectional view of the drilling device shown in FIG. 3 taken along the line AA. FIG. 4 is a partially enlarged view of the vicinity of the processed portion of the drilling device shown in FIG. 3; 4 is a flow chart showing a drilling method executed by the drilling device according to the first embodiment of the present disclosure; It is a longitudinal cross-sectional view showing the drilling device before performing a supporting step. FIG. 4 is a vertical cross-sectional view showing the drilling device after carrying out a supporting step; It is a longitudinal cross-sectional view showing the drilling device in the drilling process. FIG. 10 is a vertical cross-sectional view showing the drilling unit moved to the retracted position; FIG. 7 is a partial enlarged view of the vicinity of a processed portion of a drilling device according to a second embodiment of the present disclosure; FIG. 11 is a partial enlarged view of the vicinity of a processed portion of a drilling device according to a third embodiment of the present disclosure;

Embodiments according to the present disclosure will be described below. Each embodiment described below represents one aspect of the present disclosure and does not limit the present disclosure. Each embodiment described below can be arbitrarily modified within the scope of the technical idea of the present disclosure.

[First Embodiment]
A punching device 100 according to a first embodiment of the present disclosure will be described below with reference to the drawings. FIG. 1 is a perspective view showing stringer 210 and clip 220. FIG. FIG. 2 is a schematic configuration diagram showing the drilling device 100 according to the first embodiment of the present disclosure. FIG. 3 is a vertical cross-sectional view showing the drilling device 100 according to the first embodiment of the present disclosure.

FIG. 4 is a cross-sectional view of the drilling device 100 shown in FIG. 3 taken along the line AA. FIG. 5 is a partially enlarged view of the vicinity of the processed portion of the drilling device 100 shown in FIG. The vertical cross-sectional view shown in FIG. 3 is a cross-sectional view taken along line BB in FIG. White arrows shown in FIGS. 3 to 5 indicate the direction of air flow.

A drilling device 100 of the present embodiment is a device for drilling a portion to be processed in which a plurality of workpieces are piled up. As shown in FIG. 1, the plurality of workpieces includes, for example, stringers 210 and clips 220 used in aircraft.

The stringer 210 is an elongated member arranged along the longitudinal direction of the aircraft. The clip 220 is a member for fastening the stringer 210 to a frame (not shown) that cylindrically holds the fuselage of the aircraft divided into panels. Stringer 210 and clip 220 are made of, for example, an aluminum alloy. The punching device 100 of the present embodiment punches a workpiece 300 in which the stringer 210 and the clip 220 are overlapped. The processed portion 300 is a portion in which the stringer 210 and the clip 220 are superimposed and integrated, and is a portion in which an insertion hole 303 is formed by a drilling process using the drilling device 100 .

A rivet (not shown) made of, for example, an aluminum alloy is inserted into the through hole formed in the processed portion 300 by the drilling process. A riveting device (not shown) fastens the stringer 210 and the clip 220 via the rivet by deforming the rivet inserted in the through hole. Although only a single clip 220 is shown in FIG. 1, multiple clips 220 are attached to the stringer 210 at multiple locations along its length.

In the present embodiment, the stringer 210 and the clip 220 made of an aluminum alloy are used as the workpieces to be drilled by the drilling device 100, but other modes are possible. For example, a metal material other than an aluminum alloy or a material other than a metal material may be used.

As shown in FIGS. 2 and 3, the drilling device 100 of the present embodiment includes an upper clamp (first support) 10, a lower clamp (second support) 20, a drilling unit (drilling section) 30, A suction blower 40 , a discharge blower 50 , an injection blower (injection section) 60 and a control section 70 are provided. As shown in FIG. 2, the control unit 70 and other units are electrically connected via a signal line 101 so as to be communicable.

As shown in FIG. 3, the punching device 100 of the present embodiment punches a workpiece 300 in which workpieces composed of a stringer 210 and a clip 220 are stacked. The drilling apparatus 100 cuts the upper surface 301 of the processed portion 300 by the drilling unit 30 arranged on the upper surface (first surface) 301 side of the processed portion 300 to the lower surface (second surface) 302 of the processed portion 300 . pass through. Axis X shown in FIG. 3 is a straight line orthogonal to upper surface 301 and lower surface 302 of workpiece 300 .

The upper clamp 10 is a tubular member extending along the axis X. As shown in FIG. The upper clamp 10 has an upper movement mechanism (not shown) that moves along the axis X so as to come into contact with or separate from the upper surface 301 of the workpiece 300 in response to a control signal from the controller 70 . The upper clamp 10 is connected to a tubular portion 11 formed in a tubular shape having an inner peripheral surface 11a extending along the axis X, and is connected to the tubular portion 11 so that the outer diameter and and a reduced diameter portion 12 having a reduced inner diameter. The reduced-diameter portion 12 has a reduced inner and outer diameter to avoid interference with the clip 220 and has a cylindrical shape extending along the axis X. As shown in FIG. The upper clamp 10 supports the upper surface 301 of the processed portion 300 by bringing the lower end of the cylindrical portion 11 into contact with the upper surface 301 of the processed portion 300 .

The upper clamp 10 has a discharge port (discharge portion) 13 for discharging air (gas) toward the inside of the cylinder portion 11 and a suction port (suction port) for sucking the cutting chips 400 generated by the drilling process by the drilling unit 30 together with the air. part) 14. Details of the discharge port 13 and the suction port 14 will be described later.

The lower clamp 20 is a tubular member extending along the axis X. As shown in FIG. The lower clamp 20 has a lower movement mechanism (not shown) that moves along the axis X so as to come into contact with or separate from the lower surface 302 of the workpiece 300 in response to a control signal from the controller 70 . The lower clamp 20 supports the lower surface 302 of the workpiece 300 by bringing its upper end into contact with the lower surface 302 of the workpiece 300 .

The drilling unit 30 is a mechanism for drilling the workpiece 300 with the top surface 301 supported by the upper clamp 10 and the bottom surface 302 supported by the lower clamp 20 . The punching unit 30 forms an insertion hole 303 for inserting a fastener such as a rivet or bolt in the processed portion 300 by punching. Further, when forming the insertion hole 303, the part to be machined 300 is cut and cutting waste 400 is generated. The cutting debris 400 has a length of about 30 mm.

As shown in FIG. 3, the drilling unit 30 has a drill 31 extending along the axis X and a drive mechanism 32 rotating the drill 31 about the axis X. As shown in FIG. The drive mechanism 32 drills inside the cylindrical portion 11 and the reduced diameter portion 12 along the axis X so as to come into contact with or separate from the upper surface 301 of the processed portion 300 according to a control signal transmitted from the control portion 70 . Move 31.

As shown in FIG. 4, the drill 31 has a circular cross-sectional shape perpendicular to the axis X (the cross-sectional shape of the outer shape excluding the grooves 31a), and a pair of grooves 31a that turn along the axis X are formed on the outer peripheral surface. It is a member formed in a substantially bar shape. The drill 31 is driven by the drive mechanism 32 to rotate about the axis X in the clockwise rotation direction RD when cutting the workpiece 300 .

The suction blower 40 is a device that serves as a suction source through which the suction port 14 sucks the chips 400 together with air. A suction blower 40 is connected to the suction port 14 of the upper clamp 10 via a suction pipe 41 . The suction blower 40 sucks air through a filter (not shown) and discharges it into the atmosphere after passing through the filter, thereby guiding the air present inside the tubular portion 11 of the upper clamp 10 to the suction port 14. generate an air current. The suction blower 40 has a suction capacity of 3.5 m ³ /min, for example.

The discharge blower 50 is a device that generates a stream of air discharged from the discharge port 13 . A discharge blower 50 is connected to the discharge port 13 of the upper clamp 10 via a discharge pipe 51 . The discharge blower 50 blows air to the discharge port 13 through the discharge pipe 51 by releasing the electromagnetic valve and discharging compressed air.

The jet blower 60 is a device that jets air (gas) for removing the chips 400 attached to the drilling unit 30 from the workpiece 300 at the retracted position where the drilling unit 30 is retracted from the workpiece 300. . The injection blower 60 is connected to an injection port 61 via an injection pipe 62 shown in FIG.

As shown in FIG. 10, the injection port 61 has an injection flow path 61a having a central axis along the linearly extending axis Y1 and having a circular cross-sectional shape perpendicular to the axis Y1. The air flowing through the injection flow path 61 a is injected toward the removal position P4 on the outer peripheral surface 31 b of the drill 31 . The direction in which the injection port 61 discharges air is the direction along the axis Y1, and preferably coincides with the helix angle α of the groove 31a of the drill 31 . By injecting air from the injection port 61 to the removal position P4, it is possible to remove the chips 400 that could not be removed by the air discharged from the discharge port 13 and remained in the groove 31a.

The control unit 70 controls an upper movement mechanism (not shown) of the upper clamp 10, a lower movement mechanism (not shown) of the lower clamp 20, the drilling unit 30, the suction blower 40, the discharge blower 50, and the jet blower 60. , is a device that controls The control unit 70 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. A series of processes for realizing various functions are stored in a storage medium or the like in the form of a program, for example. Various functions of the control unit 70 are realized by the CPU reading the program to the RAM or the like and executing information processing/calculation processing.

Next, details of the upper clamp 10 will be described.
As shown in FIG. 3, the upper clamp 10 includes a discharge port 13 for discharging air (gas) discharged by a discharge blower 50 toward the inside of the cylindrical portion 11, and a drill 31 for discharging the air discharged from the discharge port 13. and a suction port 14 for sucking together with the shavings 400 generated by cutting the portion 300 to be processed by the suction port 14 .

As shown in FIGS. 4 and 5, the discharge port 13 has a linearly extending axis Y as a central axis, and has a circular cross-sectional shape perpendicular to the axis Y (for example, a diameter of 0.5 mm or more and 1.5 mm). ) is provided inside. The air flowing through the discharge channel 13a is directed from the discharge position P1 where the discharge channel 13a and the inner peripheral surface 11a of the cylindrical portion 11 intersect, to the inner peripheral surface 11a of the cylindrical portion 11 of the upper clamp 10 and the outer peripheral surface of the drill 31. 31b and into an annular space S1 formed around the axis X. The pressure of the air discharged from the discharge port 13 into the annular space S1 is set to, for example, 3 kg/cm ² or more and 7 kg/cm ² or less.

In the above description, the cross-sectional shape of the discharge port 13 orthogonal to the axis Y is assumed to be circular, but it may be in another form. For example, it may be any shape different from a circle, such as an ellipse.

The annular space S1 is a space formed between the inner peripheral surface 11a of the cylindrical cylindrical portion 11 centered on the axis X and having a radius R1 and the outer peripheral surface 31b of the drill 31 having a radius R2. The radius R1 is set to, for example, 7.5 mm or more and 9 mm or less. The radius R2 is set to, for example, 2.5 mm or more and 3.5 mm or less.

As shown in FIG. 4, the discharge port 13 discharges air supplied from the discharge blower 50 through the discharge pipe 51 from the discharge position P1 toward the removal position (predetermined position) P2 of the outer peripheral surface 31b of the drill 31. do. Here, the outer peripheral surface 31b of the drill 31 refers to a surface through which the longest distance from the axis X (maximum outer diameter position) passes when the drill 31 is rotated about the axis X. In FIG. 4, the position with the radius R2 with respect to the axis X is the maximum outer diameter position.

FIG. 4 is a cross-sectional view of the drilling device 100 shown in FIG. As shown in FIG. 4, in the present embodiment, when the drill 31 is viewed from above along the axis X, the discharge port 13 is arranged in the tangential direction of the outer peripheral surface 31b of the drill 31 passing through the removal position P2 of the outer peripheral surface 31b. It can also take the form of ejecting air in a direction coinciding with TD. The discharge port 13 is arranged so that the extension of the axis Y, which is the central axis of the discharge flow path 13a, contacts the outer peripheral surface 31b at the removal position P2. That is, the discharge port 13 is installed so that the tangent to the removal position P2 is arranged on the extension of the axis Y. As shown in FIG.

Here, the direction in which the air is discharged from the discharge port 13 is set to match the tangential direction TD of the outer peripheral surface 31b passing through the removal position P2, but other modes are possible. For example, the direction in which the air is discharged from the discharge port 13 from the discharge position P1 is set to the tangential direction of the outer peripheral surface 31b passing through the removal position P2 within a predetermined angle range (for example, -5° to 5°) with respect to the tangential direction TD. You may make it differ from the direction which corresponds with TD.

As shown in FIG. 4, at the removal position P2, the rotation direction RD in which the drill 31 rotates is the same as the tangential direction TD that coincides with the air discharge direction from the discharge position P1. At the removal position P2, the drive mechanism 32 of the drilling unit 30 rotates the drill 31 so that the outer peripheral surface 31b moves in the same direction as the air discharge direction. The discharge speed of the air discharged from the discharge port 13 may be set within a range of 10 times or more and 25 times or less the moving speed of the drill 31 along the rotational direction RD.

As shown in FIG. 5, a discharge position P1 where the discharge port 13 discharges air is a position separated from the upper surface 301 of the workpiece 300 along the axis X by a length L1. On the other hand, the removal position P2 on the outer peripheral surface 31b of the drill 31 is a position separated from the upper surface 301 of the workpiece 300 along the axis X by the length L2. Here, the work piece 300 refers to the portion where the stringer 210 and the clip 220 are to be punched, but it is not limited to the case where two members are piled up, and three or more work pieces may be piled up.

As shown in FIG. 5, since the length L2 is shorter than the length L1, in the height direction along the axis X, the removal position P2 is arranged at a lower position than the discharge position P1. The discharge port 13 discharges air from the discharge position P<b>1 in a direction crossing the upper surface 301 of the processed portion 300 . The direction in which the discharge port 13 discharges air is the direction along the axis Y and the direction that coincides with the helix angle α of the groove 31 a of the drill 31 . The helix angle α is the inclination angle of the groove 31 a with respect to the direction along the axis X, which is the axial direction of the drill 31 . The twist angle α is set to, for example, 20° or more and 40° or less.

Here, the direction in which the air is discharged from the discharge port 13 is set to match the twist angle α of the groove 31a, but other modes may be adopted. For example, the direction in which air is discharged from the discharge port 13 may differ from the twist angle α of the groove 31a within a predetermined angle range (for example, an angle range of α−5° or more and α+5° or less).

As shown in FIGS. 4 and 5, the suction port 14 has an axis Z that extends linearly across the axis X that is the central axis of the drill 31, and has a cross-sectional shape perpendicular to the axis Z. Ideally, the suction channel 14a is formed in a circular shape (for example, a diameter of 10 mm or more and 14 mm or less). The axis Z is the central axis of the suction port 14 . Air flowing through the suction channel 14a is sucked from the annular space S1 to a suction position P3 where the suction channel 14a and the inner peripheral surface 11a of the cylindrical portion 11 intersect. The air and chips 400 guided to the suction flow path 14a at the suction position P3 are guided from the suction flow path 14a to the suction blower 40 via the suction pipe 41. As shown in FIG. The height of the suction position P3 shown in FIG. 5 from the upper surface 301 along the axis X is set so that the suction port 14 does not interfere with the clip 220.

As shown in FIG. 5, the suction position P3 of the suction port 14 is a position separated from the upper surface 301 of the workpiece 300 along the axis X by a length L3. Since the length L3 is longer than the length L1, in the height direction along the axis X, the suction position P3 is arranged at a position higher than the discharge position P1. The reason why the ejection port 13 is arranged at a position higher than the ejection position P1 is to avoid interference with the clip 220 .

As shown in FIG. 4, a suction position P3 where the suction port 14 sucks the chips 400 together with air is arranged at an angle θ2 from the removal position P2 in the circumferential direction around the axis X. As shown in FIG. The angle θ2 is preferably set to, for example, 90° or more and 180° or less. That is, the suction position P3 is preferably arranged within a range of half the circumference from the removal position P2 in the circumferential direction around the axis X. As shown in FIG.

As shown in FIG. 4, the discharge position P1 at which the discharge port 13 discharges air is spaced apart from the removal position P2 by an angle θ1 in the circumferential direction around the axis X. As shown in FIG. It is preferable to set the angle obtained by adding the angle θ1 and the angle θ2 to, for example, 90° or more and 270° or less.

Next, a drilling method executed by the drilling device 100 according to this embodiment will be described with reference to the drawings. FIG. 6 is a flow chart showing a drilling method executed by the drilling device 100 according to this embodiment. FIG. 7 is a vertical cross-sectional view showing the drilling device 100 before carrying out the supporting process. FIG. 8 is a vertical cross-sectional view showing the drilling device 100 after performing the supporting process. FIG. 9 is a longitudinal sectional view showing the drilling device 100 in the drilling process.

In step S101 (supporting step), an upper moving mechanism (not shown) of the upper clamp 10 is controlled by a control signal transmitted from the control section 70, and the lower end of the cylindrical section 11 approaches the upper surface 301 of the processed section 300. move in the direction The upper clamp 10 moves to a position where the lower end of the cylindrical portion 11 contacts the upper surface 301 of the processed portion 300 and supports the upper surface 301 of the processed portion 300 .

Further, in step S101, a lower movement mechanism (not shown) of the lower clamp 20 is controlled by a control signal transmitted from the control section 70, and the upper end of the lower clamp 20 moves in a direction approaching the lower surface 302 of the workpiece 300. Moving. The lower clamp 20 moves to a position where the upper end contacts the lower surface 302 of the workpiece 300 and supports the lower surface 302 of the workpiece 300 . When step S101 is executed, the punching device 100 changes from the state shown in FIG. 7 to the state shown in FIG.

In step S102 (drilling step), the drill 31 of the drilling unit 30 drills the workpiece 300 while the workpiece 300 is supported by the upper clamp 10 and the lower clamp 20 . The driving mechanism 32 of the drilling unit 30 is controlled by a control signal transmitted from the control section 70, and moves from the retracted position indicated by the solid line in FIG. 8 to the position on the axis X indicated by the broken line in FIG.

Further, in step S<b>102 , the drive mechanism 32 of the punching unit 30 is controlled by the control signal transmitted from the control section 70 . The drilling unit 30 moves along the axis X toward the upper surface 301 of the workpiece 300 (downward direction in FIG. 8) inside the reduced-diameter portion 12 and the cylindrical portion 11 of the upper clamp 10. The state shown in 9 is obtained. The drive mechanism 32 rotates the drill 31 about the axis X along the rotation direction RD until the insertion hole 303 is formed in the workpiece 300 .

When the drilling unit 30 moves further toward the upper surface 301 of the workpiece 300, the tip of the drill 31 comes into contact with the upper surface 301 of the workpiece 300, and drilling by the drill 31 is started. When the drill 31 moves further downward along the axis X while contacting the part to be processed 300, an insertion hole 303 is formed in the part to be processed 300 as shown in FIGS.

Further, in step S102, the discharge blower 50 is controlled by the control signal transmitted from the controller 70. FIG. The discharge blower 50 supplies air to the discharge port 13 through the discharge pipe 51 . The discharge port 13 discharges air toward the removal position P2 of the outer peripheral surface 31b of the drill 31 for removing the cutting chips 400 generated by the drilling of the workpiece 300 from the groove 31a of the drill 31 .

Further, in step S102, the suction blower 40 is controlled by the control signal transmitted from the controller 70. FIG. The suction blower 40 sucks and discharges air from the discharge pipe 51, thereby sucking the chips 400 from the annular space S1 to the suction port 14 together with the air.

In step S103 (retreat step), in response to the formation of the insertion hole 303 in the workpiece 300, the drilling unit 30 is moved upward along the axis X from the position where the drill 31 is inserted into the insertion hole 303. It is moved and retracted from the part to be processed 300 . The drilling unit 30 moves to the position on the axis X indicated by the dashed line in FIG. 8, and then to the retracted position indicated by the solid line in FIG.

In step S104 (injection process), air for removing chips 400 from the groove 31a of the drill 31 is blown from the injection port 61 toward the outer peripheral surface 31b of the drill 31 while the drilling unit 30 is retracted to the retracted position. is injected. In addition, it is good also as the aspect which does not perform the injection process of step S104. Step S104 is an effective means for removing the chips when the drill returns to the retracted position with the chips wrapped around the drill. chip removal is possible. Through the above processing, the drilling process for forming the insertion hole 303 in the processed portion 300 is executed.

The operation and effects of the punching device 100 of the present embodiment described above will be described.
According to the drilling apparatus 100 of the present embodiment, the upper surface 301 of the workpiece 300 on which the stringer 210 and the clip 220 are superimposed is supported by the upper clamp 10, and the lower surface 302 of the workpiece 300 is supported by the lower clamp 20. Then, by rotating the drill 31 having the groove 31a formed in the outer peripheral surface 31b around the axis X, the part to be processed 300 is drilled. Cutting waste 400 is generated from a workpiece 300 cut by the drill 31 and grows along the groove 31 a of the drill 31 . When the cutting chips 400 grow to a predetermined length or more, the ends of the cutting chips 400 protrude outside the outer peripheral surface 31 b of the drill 31 .

According to the drilling device 100 of the present embodiment, the air for removing the chips 400 generated by the drilling of the workpiece 300 by the drilling unit 30 from the groove 31a of the drill 31 is supplied from the discharge port 13 to the periphery of the drill 31. It is discharged toward the removal position P2 on the surface 31b. The discharge port 13 discharges air in a direction coinciding with the tangential direction TD of the outer peripheral surface 31b passing through the removal position P2 when the drill 31 is viewed from above along the axis X. Therefore, the air discharged from the discharge port 13 is blown to the ends of the chips 400 protruding outside the outer peripheral surface 31 b of the drill 31 . As a result, the ends of the chips 400 are separated from the outer peripheral surface 31 b of the drill 31 and the chips 400 leave the groove 31 a of the drill 31 . The chips 400 separated from the groove 31 a of the drill 31 are sucked by the suction port 14 together with the air discharged from the discharge port 13 .

As described above, according to the drilling apparatus 100 of the present embodiment, since the cutting chips 400 adhering to the groove 31a of the drill 31 of the drilling unit 30 are removed by the air discharged from the discharge port 13, the groove of the drill 31 is removed. It is possible to prevent the stringer 210 and the clip 220 from being damaged by the shavings 400 that grow with the shavings 400 attached to the 31a.

According to the punching device 100 of the present embodiment, in the circumferential direction around the axis X, the suction position P3 is arranged within a half circumference from the removal position P2 through which the air discharged from the discharge port 13 passes. Therefore, the air discharged from the discharge port 13 is guided to the suction port 14 together with the chips 400 while maintaining the velocity component discharged from the discharge port 13 without revolving around the axis X. As a result, in the annular space S1 formed between the upper clamp 10 and the outer peripheral surface 31b of the drill 31, the chips 400 are circulated around the axis X and sucked from the removal position P2 without damaging the workpiece 300. Cutting waste 400 can be guided toward position P3.

According to the drilling device 100 of the present embodiment, air is discharged from the discharge position P1 in a direction intersecting the upper surface 301, so that the chips 400 released from the groove 31a of the drill 31 are guided toward the upper surface 301. Since the chips 400 separated from the groove 31a of the drill 31 are not guided away from the upper surface 301, it is possible to prevent the chips 400 from being discharged to the outside of the upper clamp 10 without being guided to the suction port 14. .

According to the drilling device 100 of this embodiment, air is discharged in a direction that matches the twist angle α of the groove 31 a of the drill 31 . Therefore, it is possible to separate the cutting chips 400 from the grooves 31a of the drill 31 by pulling the ends of the cutting chips 400 away from the outer peripheral surface 31b along the direction matching the helix angle α of the grooves 31a of the drill 31 .

According to the drilling device 100 of the present embodiment, the outer peripheral surface 31b of the drill 31 moves in the same direction as the air discharge direction at the removal position P2 through which the air discharged from the discharge port 13 passes. Therefore, the cutting chips 400 adhering to the grooves 31a of the drill 31 are always given a force in the direction of separating them from the grooves 31a, and the separation of the cutting chips 400 from the grooves 31a can be promoted. Further, since the drill 31 gives the cutting chips 400 a velocity component from the removal position P2 toward the suction port 14, the cutting chips 400 can be guided to the suction port 14 more reliably.

According to the drilling apparatus 100 of the present embodiment, the drilling unit 30 is retracted from the workpiece 300 and at the retracted position, the air is discharged from the discharge port 13 by injecting air toward the outer peripheral surface 31b of the drill 31 . The cutting debris 400 remaining in the groove 31a without being removed by air can be removed before performing the next drilling process.

[Second embodiment]
Next, a punching device 100A according to a second embodiment of the present disclosure will be described with reference to the drawings. FIG. 11 is a partially enlarged view of the vicinity of the processed portion 300 of the drilling device 100A according to this embodiment. This embodiment is a modified example of the first embodiment, and is assumed to be the same as the first embodiment except for the case where it will be particularly described below, and the description below will be omitted.

The discharge port 13 of the punching device 100 of the first embodiment discharges air from the discharge position P1 in a direction intersecting with the upper surface 301 of the workpiece 300 . On the other hand, the discharge port 13A of the punching device 100A of the present embodiment discharges air from the discharge position P1A in a direction parallel to the upper surface 301 of the workpiece 300. As shown in FIG.

As shown in FIG. 11, the upper clamp 10A of the punching device 100A of this embodiment has a discharge port 13A. The discharge port 13A has an axis Y1 extending linearly as a central axis, and has a discharge flow path 13Aa having a circular cross-sectional shape perpendicular to the axis Y1 (for example, a diameter of 0.5 mm or more and 1.5 mm or less). have in

The air flowing through the discharge channel 13Aa is directed from the discharge position P1A where the discharge channel 13Aa and the inner peripheral surface 11Aa of the cylindrical portion 11A intersect, to the inner peripheral surface 11Aa of the cylindrical portion 11A of the upper clamp 10A and the outer peripheral surface of the drill 31. 31b and into an annular space S1 formed around the axis X. The pressure of the air discharged from the discharge port 13A into the annular space S1 is set to, for example, 3 kg/cm ² or more and 7 kg/cm ² or less.

As shown in FIG. 11, the discharge port 13A discharges air supplied from the discharge blower 50 through the discharge pipe 51 from the discharge position P1 toward the removal position (predetermined position) P2A of the outer peripheral surface 31b of the drill 31. do. The discharge port 13A discharges air in a direction parallel to the upper surface 301 of the processed portion 300 from the discharge position P1.

According to the drilling device 100A of the present embodiment, since air is discharged from the discharge position P1A in a direction parallel to the upper surface 301, the chips 400 released from the groove 31a of the drill 31 are guided in a direction parallel to the upper surface 301. . Since the chips 400 separated from the groove 31a of the drill 31 are not directly guided toward the upper surface 301, the chips 400 can be prevented from being directly guided to the upper surface 301 and damaging the upper surface 301.

[Third Embodiment]
Next, a drilling device 100B according to a third embodiment of the present disclosure will be described with reference to the drawings. FIG. 12 is a partially enlarged view of the vicinity of the processed portion 300 of the drilling device 100B according to this embodiment. This embodiment is a modified example of the first embodiment, and is assumed to be the same as the first embodiment except for the case where it will be particularly described below, and the description below will be omitted.

The upper clamp 10 of the drilling device 100 of the first embodiment had a single discharge port 13 . In contrast, the upper clamp 10B of the punching device 100B of the present embodiment has a discharge port 15 in addition to the discharge port 13 .

As shown in FIG. 12, the upper clamp 10B of the punching device 100B of this embodiment has a discharge port 15. As shown in FIG. The discharge port 15 has an axis Z1 extending linearly as a central axis, and has a discharge flow passage 15a having a circular cross-sectional shape perpendicular to the axis Z1 (for example, a diameter of 0.5 mm or more and 1.5 mm or less). have in

The air flowing through the discharge channel 15a is directed from the discharge position P5 where the discharge channel 15a and the inner peripheral surface 11Ba of the cylindrical portion 11B intersect to the inner peripheral surface 11Ba of the cylindrical portion 11B of the upper clamp 10B and the outer peripheral surface of the drill 31. 31b and into an annular space S1 formed around the axis X. The pressure of the air discharged from the discharge port 15 into the annular space S1 is set to, for example, 3 kg/cm ² or more and 7 kg/cm ² or less.

As shown in FIG. 12, the discharge port 15 discharges the air supplied from the discharge blower 50 through the discharge pipe 52 from the discharge position P5 toward the removal position (predetermined position) P6 of the outer peripheral surface 31b of the drill 31. do. The discharge port 15 discharges air in a direction parallel to the upper surface 301 of the processed part 300 from the discharge position P1.

According to the drilling device 100</b>B of this embodiment, air is discharged from both the discharge port 13 and the discharge port 15 to the outer peripheral surface 31 b of the drill 31 . Therefore, compared with the case where air is discharged from a single discharge port, the chips 400 attached to the groove 31a of the drill 31 can be reliably removed.

Further, according to the drilling device 100B of the present embodiment, air is discharged from the discharge position P5 in a direction parallel to the upper surface 301, so that the cutting chips 400 separated from the groove 31a of the drill 31 move in a direction parallel to the upper surface 301. be guided. Since the chips 400 separated from the groove 31a of the drill 31 are not directly guided toward the upper surface 301, the chips 400 can be prevented from being directly guided to the upper surface 301 and damaging the upper surface 301.

Further, according to the drilling device 100B of the present embodiment, even if the cutting chips 400 are guided to the upper surface 301 by the air discharged from the discharge port 13 toward the upper surface 301, they are cut in the direction parallel to the upper surface 301 from the discharge position P5. The ejected air can prevent the chips 400 from colliding with the upper surface 301 .

The discharge port 13 of the present embodiment discharges air from the discharge position P1 in the direction intersecting with the upper surface 301 of the processed part 300, as in the first embodiment, but may be in another mode. . For example, like the ejection port 13A of the second embodiment, air may be ejected from the ejection position P1 in a direction parallel to the upper surface 301 of the processed portion 300. FIG.

The punching device (100) described in the embodiments described above can be grasped, for example, as follows.
A drilling device (100) according to the present disclosure drills a workpiece (300) in which a plurality of workpieces (210, 220) are stacked, and is formed into a cylindrical shape extending along an axis (X). A first support (10) supporting a first surface (301) of the part to be processed, and a second support (10) formed in a cylindrical shape extending along the axis and supporting a second surface (302) of the part to be processed. 2 a support body (20) and a drilling part (30) for drilling the part to be processed, the drilling part having a circular cross-sectional shape orthogonal to the axis and rotating along the axis a drill (31) having a groove (31a) formed on its outer peripheral surface, and rotating the drill around the axis and moving the drill so as to come into contact with or separate from the first surface of the workpiece; and a drive mechanism (32) for moving the inside of the first support (10) along the a discharge part (13) for discharging gas toward a predetermined position on the outer peripheral surface of the drill for removing from the groove of the drill; and a suction part (14) for sucking the chips together with the gas. The discharge portion discharges gas in a direction that coincides with a tangential direction of the outer peripheral surface passing through the predetermined position when the drill is viewed from above along the axis.

According to the drilling device according to one aspect of the present disclosure, the first surface of the processed portion in which the plurality of processed materials are stacked is supported by the first support, and the second surface of the processed portion is supported by the second support. A drill having grooves formed on its outer peripheral surface is rotated around its axis while being supported, so that a drilling process is performed on the part to be processed. Chips are generated from the workpiece cut by the drill, and the chips grow along the flutes of the drill. When the chips grow to a predetermined length or longer, the ends of the chips protrude outside the outer peripheral surface of the drill.

According to the drilling device according to one aspect of the present disclosure, the gas for removing cutting chips generated by the drilling process of the workpiece by the drilling unit from the discharge unit is delivered to a predetermined position on the outer peripheral surface of the drill. It is discharged towards. The discharge part discharges gas in a direction that coincides with a tangential direction of the outer peripheral surface that passes through a predetermined position when the drill is viewed from above along the axis. Therefore, the gas discharged from the discharge part is blown to the end of the chips projecting outside the outer peripheral surface of the drill. As a result, the ends of the chips are pulled away from the outer peripheral surface of the drill and the chips are separated from the flutes of the drill. Chips separated from the groove of the drill are sucked by the suction part together with the gas discharged from the discharge part.

As described above, according to the drilling device according to one aspect of the present disclosure, the cutting chips adhering to the groove of the drill of the drilling section are removed by the gas discharged from the discharge section, so that the cutting chips remain in the groove of the drill. It is possible to prevent the workpiece from being damaged by the cutting chips that grow while adhering to them.

In the drilling device according to an aspect of the present disclosure, it is preferable that a suction position where the suction unit suctions the cutting waste is arranged within a range of half a circumference from the predetermined position in the circumferential direction around the axis.
According to the punching device of this configuration, in the circumferential direction around the axis, the suction position is arranged within a range of half the circumference from the predetermined position through which the gas discharged from the discharge part passes. Therefore, the gas discharged from the discharge part is guided to the suction part together with the chips while maintaining the velocity component discharged from the discharge part without revolving around the axis. As a result, in the space formed between the first support and the outer peripheral surface of the drill, the cutting chips are circulated around the axis so that the cutting chips are removed from the predetermined position toward the suction position without damaging the workpiece. can lead.

In the drilling device according to one aspect of the present disclosure, a discharge position where the discharge part discharges the gas is a position separated from the first surface along the axis, and the discharge part is located from the discharge position to the A configuration in which the gas is discharged in a direction intersecting with the first surface is preferable.
According to the drilling device of this configuration, the gas is discharged from the discharge position in the direction intersecting with the first surface, so that the chips released from the groove of the drill are guided toward the first surface. Since the chips separated from the groove of the drill are not guided away from the first surface, it is possible to prevent the chips from being discharged to the outside of the first support without being guided to the suction portion.

In the drilling device configured as described above, it is preferable that the discharge section discharges gas in a direction that matches the twist angle of the groove of the drill.
According to the drilling device of this configuration, since the gas is discharged in the direction that matches the helix angle of the flute of the drill, the ends of the chips are separated from the outer peripheral surface along the direction that matches the helix angle of the flute of the drill. , cutting chips can be more reliably separated from the flute of the drill.

In the punching device according to the aspect of the present disclosure, it is preferable that the discharge section discharges gas from the discharge position in a direction parallel to the first surface.
According to the drilling device of this configuration, the gas is discharged from the discharge position in the direction parallel to the first surface, so that the chips released from the groove of the drill are guided in the direction parallel to the first surface. Since the chips separated from the groove of the drill are not directly guided toward the first surface, it is possible to prevent the chips from being directly guided to the first surface and damaging the first surface.

In the drilling device according to the aspect of the present disclosure, it is preferable that the drive mechanism rotates the drill so that the outer peripheral surface moves in the same direction as the gas discharge direction at the predetermined position.
According to the drilling device of this configuration, the outer peripheral surface of the drill moves in the same direction as the gas discharge direction at the predetermined position through which the gas discharged from the discharge part passes. Therefore, it is possible to always apply a force in the direction of detachment from the groove portion to the chips adhering to the flute of the drill, and to promote the detachment of the chips from the flute. In addition, since the drill imparts a velocity component directed from a predetermined position to the suction portion to the chips, it is possible to more reliably guide the cutting groove to the suction portion.

In the drilling device according to one aspect of the present disclosure, gas for removing the chips from the groove of the drill toward the outer peripheral surface of the drill at a retracted position in which the drilling part is retracted from the workpiece. It is preferable to have a configuration provided with an injection portion for injecting the.
According to the drilling apparatus of this configuration, the drilling portion is retracted from the workpiece and, at the retracted position, the gas is jetted toward the outer peripheral surface of the drill. Chips adhering to the can be removed before performing the next drilling operation.

For example, the drilling method described in the embodiments described above can be grasped as follows.
A drilling method according to an aspect of the present disclosure performs a drilling process on a workpiece in which a plurality of workpieces are stacked, and a first support body formed in a cylindrical shape extending along an axis line is used to form a first support of the workpiece. a supporting step (S101) of supporting a second surface of the processed portion by a cylindrical second support that supports one surface and extends along the axis; In a state in which the work piece is supported by a support, a drill having a circular cross-sectional shape perpendicular to the axis line and having a groove formed on the outer peripheral surface thereof that rotates along the axis line is used to drill a hole in the work piece. and a drilling step (S102) of performing machining, wherein the drilling step rotates the drill about the axis and moves the drill along the axis so as to contact the first surface of the workpiece. gas for removing chips generated by drilling of the workpiece from the groove of the drill from the discharge part of the first support. The drill is discharged toward a predetermined position on the outer peripheral surface of the drill, and the suction portion of the first support sucks the chips together with the gas. The gas is discharged in a direction coinciding with a tangential direction of the outer peripheral surface passing through the predetermined position.

According to the drilling method according to one aspect of the present disclosure, the first surface of the portion to be processed in which a plurality of workpieces are stacked is supported by the first support, and the second surface of the portion to be processed is supported by the second support. By rotating the drill having grooves on the outer peripheral surface while being supported, the drilling process is performed on the part to be processed. Chips are generated from the workpiece cut by the drill, and the chips grow along the flutes of the drill. When the chips grow to a predetermined length or longer, the ends of the chips protrude outside the outer peripheral surface of the drill.

According to the drilling method according to one aspect of the present disclosure, the gas for removing chips generated by the drilling of the workpiece by the drilling unit from the groove of the drill is discharged from the discharge unit to a predetermined position on the outer peripheral surface of the drill. It is discharged towards. The discharge part discharges gas in a direction that coincides with a tangential direction of the outer peripheral surface that passes through a predetermined position when the drill is viewed from above along the axis. Therefore, the gas discharged from the discharge part is blown to the end of the chips projecting outside the outer peripheral surface of the drill. As a result, the ends of the chips are pulled away from the outer peripheral surface of the drill and the chips are separated from the flutes of the drill. Chips separated from the groove of the drill are sucked by the suction part together with the gas discharged from the discharge part.

As described above, according to the drilling method according to one aspect of the present disclosure, since the cutting debris adhering to the groove of the drill is removed by the gas discharged from the discharge part, the cutting debris adheres to the groove of the drill and grows. As a result, it is possible to prevent the workpiece from being damaged by cutting waste.

In the drilling method according to an aspect of the present disclosure, it is preferable that a suction position at which the suction portion suctions the cutting waste is arranged within a range of half a circumference from the predetermined position in the circumferential direction around the axis.
According to the drilling method of this configuration, in the circumferential direction around the axis, the suction position is arranged within a range of half the circumference from the predetermined position through which the gas discharged from the discharge part passes. Therefore, the gas discharged from the discharge part is guided to the suction part together with the chips while maintaining the velocity component discharged from the discharge part without revolving around the axis. As a result, in the space formed between the first support and the outer peripheral surface of the drill, the cutting chips are circulated around the axis so that the cutting chips are removed from the predetermined position toward the suction position without damaging the workpiece. can lead.

In the drilling method according to an aspect of the present disclosure, the ejection position at which the ejection part ejects the gas is a position separated from the first surface along the axis, and the drilling step is performed from the ejection position to the A configuration in which the gas is discharged in a direction intersecting with the first surface is preferable.
According to the drilling method of this configuration, the gas is discharged from the discharge position in the direction intersecting with the first surface, so that the chips released from the groove of the drill are guided toward the first surface. Since the chips separated from the groove of the drill are not guided away from the first surface, it is possible to prevent the chips from being discharged to the outside of the first support without being guided to the suction portion.

In the drilling method according to an aspect of the present disclosure, it is preferable that the drilling step discharges gas from the discharge part in a direction that matches the twist angle of the groove of the drill.
According to the drilling method of this configuration, since the gas is discharged in the direction that matches the helix angle of the flute of the drill, the end of the chips is separated from the outer peripheral surface along the direction that matches the helix angle of the flute of the drill. , cutting chips can be more reliably separated from the flute of the drill.

In the drilling method according to an aspect of the present disclosure, it is preferable that the drilling step discharges gas from the discharge position in a direction parallel to the first surface.
According to the drilling method of this configuration, the gas is discharged from the discharge position in the direction parallel to the first surface, so that the chips released from the groove of the drill are guided in the direction parallel to the first surface. Since the chips separated from the groove of the drill are not directly guided toward the first surface, it is possible to prevent the chips from being directly guided to the first surface and damaging the first surface.

In the drilling method according to an aspect of the present disclosure, it is preferable that the drilling step rotates the drill so that the outer peripheral surface moves in the same direction as the gas discharge direction at the predetermined position.
According to the drilling method of this configuration, the outer peripheral surface of the drill moves in the same direction as the gas discharge direction at the predetermined position through which the gas discharged from the discharge part passes. Therefore, it is possible to always apply a force in the direction of detachment from the groove portion to the chips adhering to the flute of the drill, and to promote the detachment of the chips from the flute. In addition, since the drill imparts a velocity component directed from a predetermined position to the suction portion to the chips, it is possible to more reliably guide the cutting groove to the suction portion.

In the drilling method according to one aspect of the present disclosure, gas for removing the cutting debris from the groove of the drill toward the outer peripheral surface of the drill at a retracted position where the drilling portion is retracted from the workpiece. A configuration including an injection step of injecting is preferable.
According to the drilling method of this configuration, the drilling part is retracted from the part to be machined and, at the retracted position, the gas is jetted toward the outer peripheral surface of the drill. Chips adhering to the can be removed before performing the next drilling operation.

10, 10A, 10B upper clamp (first support)
11, 11A, 11B cylindrical portions 11a, 11Aa, 11Ba inner peripheral surfaces 13, 13A, 15 discharge port (discharge portion)
13a, 13Aa, 15a discharge channel 14 suction port (suction portion)
14a suction channel 20 lower clamp (second support)
30 drilling unit (drilling part)
31 drill 31a groove 31b outer peripheral surface 32 drive mechanism 40 suction blower 50 discharge blower 60 injection blower 61 injection port (injection part)
61a injection flow path 70 control unit 100, 100A, 100B drilling device 210 stringer (workpiece)
220 clip (workpiece)
300 Workpiece 301 Upper surface (first surface)
302 lower surface (second surface)
303 insertion hole 400 chips P1, P1A, P5 discharge position P2, P4 removal position P3 suction position RD rotation direction S1 annular space TD tangential direction X, Y, Y1, Z, Z1 axis

Claims (12)

A drilling device for drilling a workpiece in which a plurality of workpieces are stacked,
a first support formed in a cylindrical shape extending along an axis and supporting a first surface of the processed portion;
a second support formed in a cylindrical shape extending along the axis and supporting a second surface of the processed portion;
a drilling section for drilling the processed portion while the processed portion is supported by the first support and the second support;
The drilling part is
a drill having a circular cross-sectional shape perpendicular to the axis and having a groove formed along the entire outer peripheral surface thereof for turning along the axis;
a drive mechanism that rotates the drill about the axis and moves the drill along the axis inside the first support so as to come into contact with or separate from the first surface of the workpiece; have
The first support is
a discharge unit for discharging a gas toward a predetermined position on the outer peripheral surface of the drill for removing cutting chips generated by the drilling of the workpiece by the drilling unit from the groove of the drill;
a suction unit for sucking the cutting chips together with gas,
When the drill is viewed from the top along the axis, the discharge part discharges gas in a direction that matches the tangential direction of the outer peripheral surface passing through the predetermined position and the twist angle of the groove of the drill. Discharge perforator. 2. The drilling device according to claim 1, wherein a suction position where said suction portion sucks said chips is arranged within a range of a half circumference from said predetermined position in a circumferential direction around said axis. A discharge position at which the discharge portion discharges the gas is a position spaced apart from the first surface along the axis,
3. The perforating device according to claim 1, wherein the discharge part discharges the gas from the discharge position in a direction intersecting with the first surface. A discharge position at which the discharge portion discharges the gas is a position spaced apart from the first surface along the axis,
3. The perforating device according to claim 1, wherein the discharge part discharges gas from the discharge position in a direction parallel to the first surface. The drilling device according to any one of claims 1 to 4 , wherein the drive mechanism rotates the drill so that the outer peripheral surface moves in the same direction as the gas discharge direction at the predetermined position. 2. An injection part for injecting gas for removing said chips from said groove of said drill toward said outer peripheral surface of said drill at a retracted position where said drilling part is retracted from said part to be machined. 6. A perforating device according to any one of claims 1 to 5 . A drilling method for drilling a workpiece in which a plurality of workpieces are stacked,
A first support formed in a cylindrical shape extending along the axis supports the first surface of the portion to be processed, and a second support formed in a shape of a cylinder extending along the axis supports the portion to be processed. a supporting step of supporting the second surface;
A groove having a circular cross-sectional shape orthogonal to the axis and rotating along the axis is formed on the entire circumference of the outer peripheral surface in a state where the processed portion is supported by the first support and the second support. a drilling step of drilling the processed portion with the formed drill;
The drilling step includes:
rotating the drill about the axis and moving the drill along the axis within the first support so as to contact the first surface of the workpiece;
A gas is discharged from a discharge portion of the first support toward a predetermined position on the outer peripheral surface of the drill for removing chips generated by drilling the workpiece from the groove of the drill. ,
sucking the cutting waste together with gas by a suction portion of the first support;
When the drill is viewed from the top along the axis, the discharge part is aligned with the tangential direction of the outer peripheral surface passing through the predetermined position and is aligned with the twist angle of the groove of the drill. Drilling method to discharge. 8. The drilling method according to claim 7 , wherein a suction position at which the suction portion sucks the chips is arranged within a range of a half circumference from the predetermined position in the circumferential direction around the axis. A discharge position at which the discharge portion discharges the gas is a position spaced apart from the first surface along the axis,
9. The drilling method according to claim 7 , wherein the drilling step ejects the gas from the ejection position in a direction intersecting with the first surface. A discharge position at which the discharge portion discharges the gas is a position spaced apart from the first surface along the axis,
9. The drilling method according to claim 7 , wherein the drilling step ejects the gas from the ejection position in a direction parallel to the first surface. The drilling method according to any one of claims 7 to 10 , wherein the drilling step rotates the drill so that the outer peripheral surface moves in the same direction as the gas discharge direction at the predetermined position. 8. A jetting step of jetting gas for removing said chips from said groove of said drill toward said outer peripheral surface of said drill at a retracted position in which said drilling portion is retracted from said portion to be machined. 12. A drilling method according to any one of claims 11 to 11.

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