JP5157643B2 - Apparatus and method for cleaning machined holes - Google Patents

Description

  The present invention relates to a technique for cleaning a machining hole in which an internal thread portion is formed at least in part.

A workpiece such as a cylinder block, which is an engine part, is cleaned by a technique such as shower cleaning after the machining hole is formed. However, in the shower cleaning in which the entire workpiece is washed, foreign matters such as chips existing inside the machining hole cannot be completely removed.
Regarding the above problem, Patent Document 1 describes a technique for cleaning the inside of a processed hole. In the technique described in Patent Document 1, a nozzle that injects a cleaning liquid toward a machining hole is formed flat, and the flat nozzle is moved so as to cross the machining hole while rotating.

Japanese Patent Laid-Open No. 10-24269

When the internal thread portion is formed in the processed hole, fine foreign matters such as chips and oil are likely to remain in the thread groove, and may not be sufficiently removed even in the cleaning process. For example, in the technique of Patent Document 1, the cleaning liquid is sprayed parallel to the axis of the machining hole, that is, toward the bottom surface of the machining hole. In this method, the cleaning liquid sprayed into the processing hole collides with the spray liquid discharged from the processing hole. In this case, a strong flow of the cleaning liquid cannot be generated inside the processing hole, and it is difficult to remove foreign matters remaining in the thread groove.
The present invention provides a technique capable of cleanly cleaning a machining hole in which a female thread portion is formed.

  As a result of intensive research, the present inventors pay attention to the flow formed in the processing hole by the cleaning fluid injected into the processing hole, and if the cleaning fluid flow can be formed along the thread groove of the processing hole, The present inventors have found that foreign matters remaining in the thread groove can be effectively removed. The present invention was created based on such knowledge and ideas.

The present invention is embodied in an apparatus for cleaning a machining hole in which an internal thread portion is formed at least in part. This apparatus is provided with a support means for supporting a workpiece in which a machining hole is formed, and a cleaning nozzle for injecting a cleaning fluid into the machining hole of the workpiece. The direction in which the cleaning nozzle sprays the cleaning fluid is not parallel to the axis of the machining hole and is in a torsional positional relationship that does not intersect the machining hole axis, and is inclined obliquely with respect to the horizontal plane perpendicular to the machining hole axis. And inclined at an angle with respect to the tangential plane on the side surface of the processing hole through which the cleaning fluid is jetted. The cleaning nozzle injects the cleaning fluid obliquely toward the side surface of the processing hole, thereby generating a swirling flow of the cleaning fluid that spirally spirals along the thread groove inside the processing hole.

  A work hole having a thread groove is formed in the workpiece. The thread groove is a groove formed on the inner wall of the processing hole and continuously extending in a spiral shape from the opening of the processing hole to the back thereof. The thread groove of the processed hole is fitted with the thread of the screw inserted into the processed hole.

In this apparatus, a gaseous and / or liquid cleaning fluid is injected obliquely toward the side surface of the processing hole. In other words, the direction in which the cleaning fluid is ejected is not parallel to the axis of the machining hole and does not intersect with the axis of the machining hole, but is in a twisted relationship with the axis of the machining hole. When the cleaning fluid is ejected obliquely toward the side surface of the machining hole, a swirling flow of the cleaning fluid swirling along the thread groove can be generated inside the machining hole. A strong flow of the cleaning liquid can be generated inside the processing hole, and foreign matters remaining in the thread groove can be effectively removed.
According to this apparatus, the processing hole in which the female thread portion is formed can be cleaned cleanly.

In the above apparatus, it is preferable that the cleaning nozzle ejects the cleaning fluid from the outside of the female screw portion toward the side surface of the female screw portion.
According to this configuration, the cleaning fluid sprayed into the machining hole advances to the bottom surface of the machining hole while turning along the side surface of the machining hole. The cleaning fluid that has reached the bottom surface of the machining hole returns to the opening of the machining hole along the axis of the machining hole and is discharged. A stable flow of cleaning fluid can be realized inside the processing hole, and a strong flow of cleaning liquid can be generated inside the processing hole.

On the other hand, it is also preferable that the cleaning nozzle jets the cleaning fluid toward the side surface of the female screw portion at a position facing the bottom surface of the processing hole.
According to this configuration, the cleaning fluid is introduced to the vicinity of the bottom surface of the processing hole through the cleaning nozzle. Then, the cleaning fluid ejected from the cleaning nozzle advances to the opening of the processing hole while being swung along the side surface of the processing hole, and is discharged. Also with this configuration, it is possible to realize a stable flow of cleaning fluid inside the processing hole, and it is possible to generate a strong flow of cleaning liquid inside the processing hole.

When the cleaning nozzle is arranged at a position facing the bottom surface of the machining hole as in the configuration described above, the cleaning nozzle has a first injection port for injecting the cleaning fluid obliquely toward the side surface of the female screw portion, and the machining hole. It is preferable to include a second injection port for injecting the cleaning fluid toward the bottom surface in parallel with the axis of the machining hole.
According to this configuration, the cleaning fluid ejected from the first injection hole forms a flow that swirls along the side surface of the processing hole, and the cleaning fluid ejected from the second injection hole is processed from the bottom surface of the processing hole. Create a flow that goes to the opening of the hole. Accordingly, it is possible to form a flow in which the foreign matter removed from the screw groove is reliably discharged to the outside.

When the first injection hole and the second injection hole are formed in the cleaning nozzle as in the configuration described above, the opening area of the first outlet is preferably larger than the opening area of the second outlet.
According to this configuration, the flow rate of the cleaning fluid ejected from the second ejection port becomes relatively small, and it is possible to prevent the swirling flow generated inside the machining hole from being disturbed.

The apparatus according to the present invention preferably further comprises means for moving at least one of the workpiece and the cleaning nozzle to adjust the relative position of the workpiece and the cleaning nozzle.
As a result, the cleaning fluid can be appropriately jetted into the machining hole in accordance with the position and shape of the machining hole formed in the workpiece.

The apparatus according to the present invention preferably further includes a cleaning tank for storing a liquid. In this case, it is preferable that the support means supports the workpiece in the liquid in the cleaning tank, and the cleaning nozzle ejects the cleaning fluid in the liquid in the cleaning tank.
Here, the liquid stored in the cleaning tank and the cleaning fluid ejected from the cleaning nozzle may be the same or different. For example, the same liquid may be sprayed from the cleaning nozzle or a gas such as air may be sprayed to the machining hole of the work supported in the liquid in the cleaning tank.
According to this configuration, since the foreign matter removed from the processing hole diffuses into the liquid in the cleaning tank, the foreign matter can be prevented from entering the processing hole again.

The present invention can also be embodied in a method for cleaning a machining hole in which an internal thread portion is formed at least in part. This method includes a supporting process for supporting a workpiece in which a machining hole is formed, and a cleaning process for injecting a cleaning fluid into the machining hole of the workpiece. In the cleaning process, the direction in which the cleaning fluid is sprayed into the machining hole of the workpiece is in a torsional positional relationship that is not parallel to the machining hole axis and does not intersect with the machining hole axis, and is in a horizontal plane perpendicular to the machining hole axis. The cleaning fluid is inclined toward the side surface of the processing hole by being inclined so as to be inclined with respect to the tangent plane on the side surface of the processing hole to which the cleaning fluid is jetted. Are injected obliquely to generate a swirling flow of the cleaning fluid swirling along the thread groove inside the machining hole.
According to this method, a strong flow of the cleaning liquid can be generated inside the processing hole, and the processing hole in which the female screw portion is formed can be cleaned cleanly.

  According to the present invention, it is possible to clean the processed hole having the female screw portion, and to significantly prevent the occurrence of defective products due to poor cleaning.

The main features of the embodiments described below are listed.
(Characteristic 1) The direction in which the cleaning nozzle ejects the cleaning fluid is not parallel to the axis of the machining hole and is in a positional relationship that does not intersect the axis of the machining hole. That is, the direction in which the cleaning nozzle ejects the cleaning fluid is in a positional relationship of twist with the axis of the machining hole.
(Characteristic 2) The direction in which the cleaning nozzle ejects the cleaning fluid is inclined with respect to a horizontal plane perpendicular to the axis of the machining hole (that is, not vertical).
(Characteristic 3) The direction in which the cleaning nozzle ejects the cleaning fluid forms an angle with the radial direction of the processing hole in a horizontal plane perpendicular to the processing hole axis (not parallel). That is, the direction in which the cleaning nozzle ejects the cleaning fluid is inclined obliquely (that is, not perpendicular) with respect to the tangential plane on the side surface of the processing hole in which the cleaning fluid is ejected.
(Characteristic 4) Cleaning that swirls along the thread groove inside the processing hole by adjusting at least one of the diameter of the cleaning nozzle and the distance between the nozzle of the cleaning nozzle and the side surface of the processing hole that injects the cleaning fluid A swirling flow of fluid is generated.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the description of the configuration common to the first embodiment in the second and third embodiments is omitted.

(First embodiment)
FIG. 1 shows a schematic configuration of the cleaning device 2. The cleaning device 2 includes a cleaning tank 4 that stores the cleaning liquid 6, a robot 8 that immerses the workpiece 12 in the cleaning tank 4, and cleaning nozzles 22 and 26. The robot 8 supports the workpiece 12 in the cleaning liquid 6 in the cleaning tank 4. The cleaning nozzles 22 and 26 inject the cleaning fluid (in this embodiment, the cleaning liquid 6) toward the work 12 in the cleaning liquid 6 of the cleaning tank 4.
A guide rail 18 is provided on the inner wall of the cleaning tank 4. Cleaning nozzles 22 and 26 are slidably disposed on the guide rail 18 by nozzle driving units 20 and 24, respectively. The nozzle drive units 20 and 24 can move the cleaning nozzles 22 and 26 in the liquid in the vertical direction by an actuator (not shown). Further, the nozzle driving units 20 and 24 can rotate the cleaning nozzles 22 and 26. The nozzle driving units 20 and 24 are controlled by a control device (not shown), and individually drive the nozzles 22 and 26. The cleaning liquid supply pipe 28 communicates with the cleaning nozzles 22 and 26, and can supply the cleaning liquid 6 in the cleaning tank 4 to the cleaning nozzles 22 and 26. A pump 30 and a filter 32 are provided on the upstream side of the cleaning nozzles 22 and 26. By operating the pump 30, the cleaning liquid 6 is introduced from the drain port 34 into the cleaning liquid supply pipe 28. The introduced cleaning liquid 6 is filtered by the filter 32 and sprayed from the cleaning nozzles 22 and 26.

  The robot 8 includes an arm 9 and a work support unit 10. The arm 9 has an upper limb side end connected to a joint (not shown) and a lower limb side end connected to the work support unit 10. The work support unit 10 supports the work 12 by holding the upper part of the work 12. The robot 8 is controlled by a control device (not shown) and can move a work supported by the work support unit 10. Machined holes 14 and 16 are formed in the workpiece 12. The processing holes 14 and 16 have a female screw structure inside.

  In the present embodiment, the nozzle driving units 20 and 24 and the robot 8 can be operated in conjunction with each other. By moving both the workpiece 12 and the cleaning nozzles 22 and 26, the relative positions of the workpiece 12 and the cleaning nozzles 22 and 26 can be adjusted. For example, the control device that controls the nozzle drive units 20 and 24 and the control device that controls the robot 8 may be connected to be communicable.

  Below, the case where the process holes 14 and 16 of the workpiece | work 12 are wash | cleaned using the washing | cleaning apparatus 2 is demonstrated. FIG. 2 is a cross-sectional view showing the inside of the processing hole 14 during cleaning, and FIG. 3 is a plan view showing the inside of the processing hole 14 during cleaning. The processed holes 14 and 16 have the same structure. Therefore, in the following description, the processing hole 14 will be described as an example, but the processing hole 16 is also cleaned simultaneously with the processing hole 14 by the same method.

  As shown in FIG. 2, a thread groove 36 is formed on the entire inner wall of the machining hole 14 of the workpiece 12. The thread groove 36 continuously extends in a spiral from the opening of the processing hole 14 to the back thereof (that is, the direction from the surface of the workpiece 12 to the bottom 38 of the processing hole 14). The thread groove 36 of the machining hole 14 has a small amount of oil adhering to fine chips generated during the internal thread forming process and other machining processes of the work 12 even after the entire workpiece 12 is cleaned. Such foreign matter 50 may adhere and remain.

Therefore, in this embodiment, the workpiece 12 is supported by the robot 8 and the machining hole 14 is cleaned by the cleaning fluid sprayed from the cleaning nozzle 22 while being immersed in the cleaning liquid 6 in the cleaning tank 4. At this time, the cleaning nozzle 22 injects the liquid cleaning fluid obliquely in the direction in which the screw groove 36 draws a spiral toward the side surface of the processing hole 14 where the screw groove 36 is formed. That is, the direction in which the cleaning fluid is ejected is not parallel to the axis of the machining hole 14 but is inclined to form an angle with respect to the axis of the machining hole 14. Therefore, the angle formed by the direction in which the cleaning fluid is ejected and the horizontal plane perpendicular to the axis of the machining hole 14 forms an acute angle (see θ1 in FIG. 2). This angle θ1 can be set based on, for example, the inclination angle (lead angle) of the thread groove 36.
Further, the direction in which the cleaning fluid is jetted does not intersect the axis of the machining hole 14 on the machining surface of the machining hole 14. That is, in the plan view shown in FIG. 3, the angle formed by the tangential plane at the point where the cleaning fluid collides with the side surface of the machining hole 14 and the direction in which the cleaning fluid is ejected forms an acute angle (see θ2 in FIG. 3). . This angle θ2 can be set based on the diameter of the processed hole 14, for example.

  When the cleaning fluid is sprayed toward the screw groove 36 from the above-described direction that is in a torsional relationship with the shaft of the processing hole 14, the cleaning fluid is introduced along the screw groove 36 into the processing hole 14. As a result, as indicated by arrows in FIGS. 2 and 3, a swirling flow of the cleaning fluid swirling along the thread groove 36 can be generated inside the machining hole 14. A strong flow of the cleaning liquid 6 occurs along the thread groove 36 inside the processing hole 14, and the foreign matter 50 remaining in the thread groove 36 can be efficiently removed. When reaching the bottom 38 of the machining hole 14, the cleaning fluid moves up the central part of the swirling flow along the axis of the machining hole 14. The removed foreign matter 50 can be discharged to the outside of the machining hole 14 without disturbing the swirl flow formed along the screw groove 36.

As described above, the position where the cleaning nozzle 22 is disposed is in a relationship of twist with the axis of the processing hole 14. Therefore, the cleaning nozzle 22 does not prevent the cleaning fluid that has risen in the central portion of the swirling flow from being discharged to the outside of the screw hole 14. A stable flow can be generated inside the processing hole 14.
In the present embodiment, the cleaning is performed with the screw hole 14 and the cleaning nozzle 22 facing each other in a direction parallel to the liquid surface. For this reason, the foreign material 50 released into the cleaning liquid 6 does not settle into the lower part of the cleaning tank 4 and enters the processing hole 14 again. According to the cleaning device 2, the processed hole 14 in which the female thread portion is formed can be cleaned cleanly.

  In addition to the angles θ1 and θ2 described above, the relationship between the size of the diameter d of the cleaning nozzle 22 and the pressure of the cleaning fluid injected from the injection port 22a, the size of the diameter d of the cleaning nozzle 22 and the size of the flank of the thread groove 36. By adjusting conditions such as the distance and the distance l between the jet port 22a of the cleaning nozzle 22 and the jet position of the cleaning fluid, a more stable and strong swirl flow can be generated inside the processing hole 14. Thereby, the processing hole 14 can be more effectively cleaned.

(Second embodiment)
FIG. 4 shows a second embodiment. The processing hole 44 of this embodiment has a female screw structure only at a part on the bottom 38 side. For example, there may be a distance between the opening portion of the processing hole 44 and the portion where the screw groove 36 is formed, such as the processing hole 44 shown in FIG. In such a case, even if a cleaning nozzle is disposed outside the processing hole 44 and the cleaning fluid is sprayed toward the inner wall 40 on the processing surface side of the processing hole 44, a sufficient cleaning effect of the thread groove 36 can be obtained. There is a risk of not. In such a case, as shown in FIG. 4, the cleaning nozzle 42 may be inserted into the machining hole 44 to inject the cleaning fluid. Also in this embodiment, the cleaning nozzle 42 injects the liquid cleaning fluid obliquely in the direction in which the screw groove 36 draws a spiral toward the side surface of the processing hole 44 where the screw groove 36 is formed. The direction in which the cleaning fluid is ejected is not parallel to the axis of the processing hole 44 and does not intersect with the axis of the processing hole 44, as in the case of the cleaning nozzle 22 described above. That is, the direction in which the cleaning fluid is ejected is in a torsional relationship with the axis of the machining hole 44. The cleaning nozzle 42 may be formed with an angled tip in order to realize the above angle condition (see FIG. 4).
This cleaning nozzle 42 can also generate a swirling flow of the cleaning fluid swirling along the thread groove 36 inside the processing hole 44 as indicated by an arrow in FIG. The processing hole 44 in which the female thread portion is formed can be cleaned cleanly.

(Third embodiment)
FIG. 5 shows a third embodiment. A thread groove 36 is formed on the entire inner wall of the processed hole 14 as in the first embodiment. For example, when the depth of the processed hole 14 is deep, a sufficient cleaning effect of the thread groove 36 on the bottom 38 side may not be obtained simply by disposing the cleaning nozzle outside the processed hole 14 and spraying the cleaning fluid. . In such a case, as shown in FIG. 5, the cleaning nozzle 52 may be inserted into the machining hole 14 to inject the cleaning fluid.

The cleaning nozzle 52 has a first injection port 52a and a second injection port 52b. When the cleaning nozzle 52 is inserted into the processing hole 14, the first injection port 52 a injects the cleaning fluid obliquely toward the thread groove 36. The second injection port 52b injects the cleaning fluid toward the bottom 38 in parallel with the axis of the machining hole 14. According to this configuration, the cleaning fluid ejected from the first injection hole 52a forms a flow swirling along the thread groove 36 of the processing hole 14, and the cleaning fluid ejected from the second injection hole 52b is processed. A flow is formed which proceeds from the bottom 38 of the hole 14 to the opening of the processed hole 14. Also in this embodiment, the first injection port 52a is configured such that the screw groove 36 draws a spiral from the bottom 38 side of the processing hole 14 toward the side surface of the processing hole 14 where the screw groove 36 is formed. Injected diagonally in the direction. Although the swirl direction formed by the jetted cleaning fluid is opposite to that of the first and second embodiments described above, the direction in which the cleaning fluid is jetted from the first jet port 52a of the cleaning nozzle 52 of the present embodiment is Similar to the first embodiment and the second embodiment, the shaft of the machining hole 14 is twisted.
Moreover, the opening area of the 1st jet nozzle 52a is formed larger than the opening area of the 2nd jet nozzle 52b. For this reason, the flow rate of the cleaning fluid ejected from the second ejection port 52b becomes relatively small, and the swirling flow generated inside the machining hole is prevented from being disturbed.

  In the present embodiment, the cleaning fluid sprayed from the cleaning nozzle 52 advances to the opening of the processing hole 14 while being swung along the screw groove 36 formed on the side surface of the processing hole 14 and is discharged. Also according to the configuration of the present embodiment, it is possible to realize a stable flow of the cleaning fluid inside the processing hole 14 and to generate a strong flow of the cleaning liquid inside the processing hole 14. The processed hole 14 in which the female thread portion is formed can be cleaned cleanly.

In the above embodiment, the robot 8 can adjust the relative position of the work 12 with respect to the nozzles 22 and 26, and the nozzle driving units 20 and 24 can adjust the relative position of the nozzles 22 and 26 with respect to the work 12. Can do. This makes it possible to appropriately realize a positional relationship that allows the cleaning fluid to be appropriately jetted into the machining hole in accordance with the position and shape of the machining hole formed in the workpiece. Further, the processing holes 14 and 44 of the workpiece 12 are cleaned in the liquid in the cleaning tank 4. Accordingly, the foreign matter 50 removed from the processing holes 14 and 44 diffuses into the liquid in the cleaning tank 4, and thus the foreign matter 50 can be prevented from entering the processing holes 14 and 44 again.
According to the present invention, it is possible to clean the processed holes 14 and 44 having the female screw portion, and to significantly prevent the occurrence of defective products due to poor cleaning.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, in the above-described embodiment, the cleaning liquid 6 is ejected from the cleaning nozzle 22 as the cleaning fluid, but other liquids or gases such as air may be ejected from the cleaning nozzle 22 as the cleaning fluid.
In the above-described embodiment, the workpiece 12 is disposed in the liquid (in the cleaning liquid 6) to clean the machining hole 14, but the workpiece 12 is disposed in the gas (for example, in the atmosphere) and the machining hole 14 is disposed. Cleaning may be performed.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

It is a figure showing schematic structure of a washing | cleaning apparatus. It is sectional drawing showing the mode inside the processing hole at the time of washing | cleaning. It is a top view showing the mode of the inside of the processing hole at the time of washing | cleaning. It is sectional drawing showing the mode of the inside of the processing hole at the time of washing | cleaning in 2nd Example. It is sectional drawing showing the mode inside the processing hole at the time of the washing | cleaning in 3rd Example.

Explanation of symbols

2: Cleaning device 4: Cleaning tank 6: Cleaning liquid 8: Robot 9: Arm 10: Work support part 12: Work 14, 16, 44: Work hole 18: Guide rail 20, 24: Nozzle driving parts 22, 26, 42, 52: Cleaning nozzles 22a, 42a: Spout 28: Cleaning liquid supply pipe 30: Pump 32: Filter 34: Drain 36: Screw groove 38: Bottom 40: Inner wall 50: Foreign matter 52a: First spout 52b: Second spout

Claims (8)

It is a device for cleaning a machining hole in which a female thread part is formed at least in part,
A support means for supporting the workpiece formed with the machining hole;
Equipped with a cleaning nozzle that sprays cleaning fluid into the workpiece hole,
The cleaning nozzle jets the cleaning fluid obliquely toward the side surface of the processing hole, and generates a swirling flow of the cleaning fluid that swirls along the thread groove inside the processing hole .
The direction in which the cleaning nozzle sprays the cleaning fluid is not parallel to the axis of the machining hole and is in a torsional positional relationship that does not intersect the machining hole axis, and is inclined obliquely with respect to the horizontal plane perpendicular to the machining hole axis. And an apparatus for cleaning a processing hole, wherein the processing hole is inclined obliquely with respect to a tangential plane on a side surface of the processing hole to which the cleaning fluid is jetted .   The apparatus for cleaning a machining hole according to claim 1, wherein the cleaning nozzle ejects a cleaning fluid from the outside of the female screw portion toward a side surface of the female screw portion.   The apparatus for cleaning a processing hole according to claim 1, wherein the cleaning nozzle sprays a cleaning fluid toward a side surface of the female screw portion at a position facing the bottom surface of the processing hole.   The cleaning nozzle includes a first injection port that injects the cleaning fluid obliquely toward the side surface of the female screw portion, and a second injection port that injects the cleaning fluid toward the bottom surface of the processing hole in parallel with the axis of the processing hole. The apparatus for cleaning a processing hole according to claim 3, wherein:   The apparatus for cleaning a processing hole according to claim 4, wherein an opening area of the first ejection port is larger than an opening area of the second ejection port. The processing hole according to any one of claims 1 to 5, further comprising means for moving at least one of the workpiece and the cleaning nozzle to adjust a relative position between the workpiece and the cleaning nozzle. Equipment to wash. A cleaning tank for storing liquid;
The support means supports the workpiece in the liquid in the cleaning tank,
The apparatus for cleaning a machining hole according to any one of claims 1 to 6, wherein the cleaning nozzle ejects a cleaning fluid in the liquid in the cleaning tank. It is a method of cleaning a machining hole in which a female screw part is formed at least in part,
A supporting step for supporting the workpiece in which the machining hole is formed;
It is equipped with a cleaning process that injects a cleaning fluid into the workpiece hole.
In the cleaning process, the direction in which the cleaning fluid is sprayed into the machining hole of the workpiece is in a torsional positional relationship that is not parallel to the machining hole axis and does not intersect with the machining hole axis, and is in a horizontal plane perpendicular to the machining hole axis. The cleaning fluid is inclined toward the side surface of the processing hole by being inclined so as to be inclined with respect to the tangent plane on the side surface of the processing hole to which the cleaning fluid is jetted. Is a method of cleaning a machining hole, characterized in that a swirling flow of a cleaning fluid that swirls along a screw groove is generated inside the machining hole.

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