JP2003001544A - Inspection tool and inspection method for seal used in spindle unit of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection tool and inspection method for seals used in a spindle unit of machine tool, which enables leakage of coolant in the spindle unit to be inspected clearly without complicating the structure of the spindle unit. SOLUTION: On a spindle unit of machine tool which is designed so that coolant can be supplied to the top of a cutting tool held with a tool holder through a coolant supply passage 32 in the spindle 17 and the tool holder, a seal inspection tool 38 is mounted instead of the tool holder. The seal inspection tool 38 provides a flow out passage 40 which discharges coolant leaked from the spindle 17 to external when it is mounted onto the spindle, in order to inspect whether coolant is flowed out or not from the opening of the flow out passage 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal inspection tool and inspection method for inspecting coolant leaking from a spindle in a spindle device of a machine tool.

[0002]

2. Description of the Related Art Generally, when machining a deep hole or a deep groove in a work with a tool such as a drill or an end mill in a machine tool, if a coolant is jetted and supplied from an external supply device such as a nozzle toward a processing portion, Coolant may not be sufficiently supplied to the blade edge of. Therefore, a so-called through spindle is formed in which the coolant supply passage is formed inside each of the spindle, the tool holder, and the tool along their axial direction, and the coolant is directly supplied to the cutting edge of the tool through the coolant supply passage. A spindle device that employs a coolant system has been conventionally proposed.

In this through-spindle coolant type spindle device, when a tool holder having a tool attached thereto is mounted on the spindle, the end portion of the tool holder abuts a coolant rod provided in the spindle, whereby the coolant of the coolant is cooled. A supply channel is connected and formed. However, if the end of the tool holder and the coolant rod are simply brought into contact with each other, the coolant leaks into the main shaft due to the wear of the seal member. When the coolant leaks in this way, the bearing, the motor, etc. provided inside the main shaft may be contaminated by the coolant, or lubrication failure or short circuit may occur, resulting in damage to the bearing, the motor, etc.
For this reason, in this type of spindle device, a seal member is interposed between the contact surfaces of the tool holder and the coolant rod to prevent the coolant from leaking into the spindle.

As described above, also in the spindle device provided with the seal member, if the coolant is supplied from the rear portion of the spindle while the seal member is worn by repeatedly exchanging the tool for the spindle, the coolant leaks into the interior of the spindle. Easier to do. Therefore, for example, Japanese Patent No. 2914918
Conventionally, it has been attempted to inspect for coolant leakage by providing an inspection structure as disclosed in Japanese Patent Publication No. JP-A-2003-242242.

That is, in this conventional structure, a coolant outflow passage communicating from the inside to the outside is formed at the tip of the main shaft, and the pressure of the coolant leaked into the main shaft exceeds a predetermined value in the coolant outflow passage. A valve member is provided that is sometimes opened. When the seal member is worn and a coolant leaks inside the main shaft, the coolant flows out through the coolant outflow passage to the tip side of the main shaft so that the coolant can be visually inspected. .

[0006]

However, in this conventional spindle device for a machine tool, it is necessary to form an outflow passage for letting out leakage coolant in the main spindle itself and to incorporate a valve member or the like into the outflow passage. There is. Therefore, there is a problem in that the structure of the spindle device is complicated and the machining and assembly of the spindle device becomes complicated.

Further, in the conventional spindle device, when a coolant is supplied to the coolant supply passage in the spindle and the tool holder with the machining of the workpiece while the tool holder is attached to the spindle, the leakage of the coolant is visually inspected. It is like this. Therefore, at the time of this inspection, the coolant is also discharged from the cutting edge of the tool through the coolant supply passage,
Scatters around as the work is processed. For this reason, it is difficult to visually check only the coolant flowing out to the tip side of the main shaft through the outflow passage, and there is also a problem that it is impossible to clearly inspect the coolant leakage.

The present invention has been made by paying attention to the problems existing in such conventional techniques. An object of the present invention is to provide a seal inspection tool and inspection method for a spindle device of a machine tool, which has a simple structure of the spindle device and can clearly inspect that coolant is leaking inside the spindle. .

[0009]

In order to achieve the above object, in the invention relating to the seal inspection tool according to claim 1, a coolant supply flow provided inside the main shaft, inside the tool holder and inside the rear part, respectively. A seal inspection tool used for a spindle device of a machine tool that supplies coolant to the tip of a tool through a passage, for inspecting the wear of a coolant leakage prevention seal, and replacing it with the tool holder. It is characterized in that an outflow passage is provided for allowing the coolant leaking from the seal portion on the main shaft side to flow out to the outside in a state of being mounted on the main shaft.

Therefore, according to the first aspect of the present invention, the coolant leakage caused by the seal damage flows out of the seal inspection tool when the seal inspection tool is attached to the main shaft instead of the tool holder. Confirmed by visually observing the coolant flowing out from the road. Therefore, it is not necessary to form an outflow passage for letting out the leaked coolant in the main spindle itself, or to install a valve member or the like in the outflow passage, and the main spindle device has a simple structure and can be easily processed and assembled. be able to. In addition, as described above, in the state where the seal inspection tool is exchangeably attached to the spindle with the tool holder, in order to visually inspect for the presence of the coolant flowing out of the outflow passage, the tool tip portion of the tool is passed through the coolant supply passage. Since there is no discharged coolant, it is possible to clearly inspect for coolant leakage inside the spindle.

According to a second aspect of the present invention, in the first aspect of the present invention, an engaging portion that engages with a seal provided on the main shaft side is provided, and the outflow passage includes the seal and the engaging portion. It is characterized in that it is arranged at a position where the coolant leaking from the gap flows out.

Therefore, it is possible to confirm the damage of the seal that engages with the engaging portion, and it is possible to reliably perform the inspection even if the seal is arranged at a position that is difficult to confirm from the outside. In the invention described in claim 3, claim 1 or claim 2
In the invention described in (3), a groove for gripping is formed on the outer circumference.

Therefore, according to the third aspect of the invention, it is possible to easily attach / detach the seal inspection tool to / from the main shaft by locking the tool exchange arm or the like in the groove on the outer periphery.
In the invention described in claim 4, claim 1 to claim 3
In the invention described in any one of 1, the outflow passage is open toward the front surface.

Therefore, according to the invention as set forth in claim 4, in the state where the seal inspection tool is mounted on the main shaft, it is easy to detect the presence or absence of the coolant flowing out from the opening of the outflow passage on the front side of the seal inspection tool. Can be visually inspected.

The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, a hollow portion is provided inside. Therefore, according to the invention described in claim 5, it is possible to reduce the weight of the seal inspection tool as a whole and easily attach and detach the seal inspection tool to and from the main shaft.

In a sixth aspect of the invention, in the invention according to any one of the first to fifth aspects, a coolant leak is displayed on at least a surface corresponding to the opening of the outflow passage. It is characterized in that display means is provided for this purpose.

Therefore, according to the sixth aspect of the present invention, the presence or absence of the coolant flowing out from the opening of the outflow passage can be more easily visually inspected by the display of the display means.

In the invention relating to the inspection method described in claim 7, the seal inspection tool according to any one of claims 1 to 6 is mounted on a main shaft, and a coolant leaks from the main shaft. It is characterized by inspecting.

Therefore, according to the invention described in claim 7, it is possible to obtain the same effects as the operations described in claims 1 to 6. In the invention according to the inspection method described in claim 8, the seal inspection tool according to any one of claims 3 to 6 is held in a tool magazine, and the seal inspection tool is held by a tool exchange arm. According to the above, the tool holder is replaced with the tool holder and mounted on the spindle, and the coolant leaking from the spindle is inspected.

Therefore, according to the invention as set forth in claim 8, the tool changing arm allows the seal inspecting tool to be easily exchanged and attached to the tool holder with respect to the main shaft, and the coolant leakage inspection can be automatically performed. Can be done.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, in this machine tool, a column 15 is supported on a base (not shown) so as to be movable in the X direction, and is moved by a drive mechanism (not shown) including a motor and a ball screw. .

A spindle head 16 is movably supported in the vertical direction (Y direction) on the column 15 and is moved by a drive mechanism including a motor and a ball screw (not shown). A spindle 17 is rotatably supported by the spindle head 16 and is rotated by a motor (not shown). At the tip of the main shaft 17,
A tool 18 such as a drill is detachably attached to a tool holder 19 in a mounted state. And this tool 1
While rotating 8, the workpiece 8 is moved toward the workpiece (not shown) so that the workpiece is perforated.

A tool exchanging device 20 is arranged on the column 15 so as to be located above the main spindle 17, and the tool exchanging device 20 allows a predetermined tool 18 for the main spindle 17.
Is exchangeably mounted together with the tool holder 19. That is,
A comb-shaped tool magazine 22 is fixed to the frame 21. A plurality of holding grooves 22a are formed in the tool magazine 22, and a tool holder 19 having different kinds of tools 18 attached thereto is detachably held in the tool pot 23 in these holding grooves 22a.

Then, as shown in FIGS. 1 and 2, the ball screw 52 is rotated by the drive of the motor 51, and the moving body 53 is moved along the extension direction of the tool magazine 22. Then, from the plurality of tools 18 held in the holding groove 22a, one selected tool 18 is picked up by the pickup body 54 by driving the cylinder 56. Next, the moving body 53 is moved to the processing section side,
The motor 55 turns 90 degrees. Next, the pickup body 54 is lowered by the cylinder 56, and the picked-up tool 18 is placed at the tool exchange position S1 on the lower transfer body 58.

A tool changing arm 24 is attached to the frame 21 so as to be positioned between the spindle 17 and the tool changing position S1.
Is rotatably and movably supported on an axis parallel to the axis of the main shaft 17, and is rotated and moved by a motor 57.
A tool gripping portion 24a is provided at both ends of the tool exchanging arm 24, and as shown in FIG. 3, engages with a gripping groove portion 19a formed on the outer periphery of the tool holder 19 to move the tool 18 and the tool holder 19 together. It is designed to be gripped.

Then, with the tool 18 and the tool holder 19 arranged at the tool replacement position S1 together with the tool pot 23, the tool replacement arm 24 is rotated and moved in the axial direction. By this movement, at one of the tool gripping portions 24a,
The tool 18 and the tool holder 19 at the tool exchange position S1 are pulled out from the tool pot 23 and mounted on the spindle 17.
At the same time, at the other tool gripping portion 24a, the spindle 17
The tool 18 and the tool holder 19 are pulled out from and are returned and mounted in the tool pot 23 at the tool exchange position S1. Further, the tool 18 and the tool holder 19 after the return mounting are moved upward together with the tool pot 23 by a tool attaching / detaching mechanism (not shown), and the empty holding groove 2 on the tool magazine 22 is moved.
It is stored in 2a.

Next, the structure of the spindle device including the spindle 17 will be described in detail. As shown in FIG.
A holding cylinder 27 is fixed inside the distal end of the, and a plurality of engagement balls 28 are held on the peripheral wall thereof so as to be movable in the radial direction. A locking cylinder 29 is provided at the base of the tool holder 19 so as to project, and an engagement recess 29a capable of engaging with the engagement ball 28 is formed on the inner surface of the peripheral wall thereof. The coolant rod 30 is fitted in the main shaft 17 so as to be movable in the axial direction, and is urged to move in the main shaft 17 by a spring (not shown). A lock rod 31 is attached to the tip of the coolant rod 30, and an inclined surface 31a and a concave portion 31b are formed on the outer peripheral surface thereof.

Then, as shown in FIG. 3, when the coolant rod 30 is biased in the main shaft 17, the inclined surface 31a of the lock rod 31 engages with the engaging balls 28, and their engagement is increased. The compound ball 28 is engaged with the engaging recess 29a of the locking cylinder 29. By this engagement, the tool holder 19 at the base end of the tool 18 is locked and held in the mounted state with respect to the spindle 17. Further, when the coolant rod 30 is moved to the tip end side of the main shaft 17 by a cylinder (not shown) in this locked state, the recess 31b of the lock rod 31 corresponds to each engaging ball 28 and the engagement of the locking cylinder 29. Mating recess 29a
The engagement ball 28 is disengaged from the. By this detachment, the locking of the tool holder 19 with respect to the spindle 17 is released, and the tool holder 19 can be removed from the spindle 17.

As shown in FIG. 3, a coolant supply passage 32 for the coolant is formed at the center of the coolant rod 30 and the lock rod 31. Also, each tool 1
A coolant supply channel 33 for the coolant is also formed in the center of the tool holder 8 and the tool holder 19. Then, with the tool 18 and the tool holder 19 mounted on the main shaft 17, both coolant supply flow paths 32 and 33 are connected to each other, and during machining of the workpiece, the tool is supplied via the coolant supply flow paths 32 and 33. Coolant is supplied to the blade edges of 18.

A first seal member 34 is fitted in the annular groove 27a on the front end surface of the holding cylinder 27, and the first seal member 34 seals the contact surface between the holding cylinder 27 and the tool holder 19. Retained. A second seal member 35 is fitted into the annular groove 31c on the outer periphery of the tip of the lock rod 31, and the second seal member 35 allows the lock rod 31 and the holding cylinder 2 to be held.
The seal between the sliding contact surfaces with 7 is retained.

In the structure of the spindle device as described above, when the tool 18 is repeatedly attached to and detached from the spindle 17,
The seal members 34 and 35 are worn and the seal holding becomes insufficient. In this case, since the first seal member 34 is exposed on the tip side of the main spindle 17, the wear state of the first seal member 34 can be directly visually checked with the tool 18 and the tool holder 19 removed from the main spindle 17. can do. On the other hand, the second seal member 35 cannot be visually checked directly from the tip side of the main shaft 17. Therefore, although the second seal member 35 is worn, the confirmation is delayed and the coolant supplied from the coolant supply passage 32 passes between the sliding contact surfaces of the lock rod 31 and the holding cylinder 27. As a result, there is a risk of leakage into the main shaft 17.

In order to inspect for such coolant leakage, as shown in FIGS. 1 and 2, the tool magazine 22 is used.
The seal inspection tool 38 is provided in the holding groove 22a of the tool pot 2
It is detachably held in a state in which it is fitted in the unit 3. Then, by the same operation as when the tool 18 is exchanged by the tool exchange arm 24, the seal inspection tool 38 is attached to the spindle 17 by exchanging the tool 18 and the tool holder 19, and the coolant leaks in the spindle 17. To be inspected.

Therefore, the structure of the seal inspection tool 38 will be described in detail. As shown in FIG. 4, the seal inspection tool 38 is formed in a short cylindrical shape having substantially the same shape as the tool holder 19, and the tool gripping portion 24 of the tool exchange arm 24 is provided on the outer periphery thereof.
A groove 38a for gripping which can be engaged with a is formed.
Further, a hollow portion 38b is formed inside the seal inspection tool 38, so that the weight of the seal inspection tool 38 as a whole is reduced.

On the back surface of the seal inspection tool 38, the locking cylinder 3 is provided.
9 is provided so as to project, and an engaging recess 39a capable of engaging with the engaging ball 28 in the main shaft 17 is formed on the inner surface of the peripheral wall thereof.
Then, with the seal inspection tool 38 mounted on the spindle 17, the engagement ball 28 engages with the engagement recess 39a of the locking cylinder 39, so that the seal inspection tool 38 is locked in the mounted state on the spindle 17. Retained.

A coolant outflow passage 40 is formed in the seal inspection tool 38, the rear end thereof is opened in the engagement recess 39a of the locking cylinder 39, and the front end thereof is sealed.
The front is open. Then, with the seal inspection tool 38 mounted on the spindle 17, the coolant supply passage 32
When the coolant is supplied to the second seal member 35 and the coolant leaks in the main shaft 17, the coolant flows out through the outflow passage 40 to the front surface of the seal inspection tool 38. To be done.

A display layer 41 as a display means is applied and formed on the front surface of the seal inspection tool 38 so as to correspond to the front end opening of the outflow passage 40. When the coolant flows out from the front end opening of the outflow passage 40, the display layer 4
1 is discolored, and the leakage of the coolant is displayed.

Therefore, according to this embodiment, the following effects can be obtained. (1) In the seal inspection tool 38 of this spindle device,
When trying to inspect for coolant leaks, the tool holder 1
It is designed so that it can be mounted on the main shaft 17 by exchanging with 9.
Further, the seal inspection tool 38 is provided with an outflow passage 40 for allowing the coolant leaking from the main shaft 17 to flow out to the outside in a state of being attached to the main shaft 17.

Therefore, unlike the conventional inspection structure, it is not necessary to form an outflow passage for letting out the leaked coolant in the main spindle 17 itself, or to install a valve member or the like in the outflow passage, and the main spindle device It has a simple structure and can be easily processed and assembled. Further, in a state where the seal inspection tool 38 is attached to the spindle 17 in exchange with the tool holder 19, the presence or absence of the coolant flowing out from the outflow passage 40 is visually inspected. Therefore, there is no coolant discharged from the cutting edge of the tool 18 via the coolant supply channels 32 and 33, and it is possible to clearly inspect the coolant leakage inside the spindle 17.

(2) The seal inspection tool 38 of this spindle device
In the above, a groove 38a is formed on the outer periphery for being gripped by the tool changing arm 24. Therefore, it is possible to easily attach and detach the seal inspection tool 38 to and from the main shaft 17 by engaging the tool exchange arm 24 with the groove 38a on the outer periphery.

(3) The seal inspection tool 38 of this spindle device
In, the outflow passage 40 is opened toward the front surface of the seal inspection tool 38. Therefore, the seal inspection tool 3
8 is mounted on the main shaft 17, and the seal inspection tool 38
It is possible to easily visually inspect the presence of leaked coolant flowing out from the opening of the outflow passage 40 on the front side of the. Therefore, the defective seal can be clearly recognized.

(4) The seal inspection tool 38 of this spindle device
In, a hollow portion 38b is provided inside. Therefore, the overall weight of the seal inspection tool 38 can be reduced, and the seal inspection tool 38 can be easily attached to and detached from the main shaft 17.

(5) The seal inspection tool 38 of this spindle device
In, the display layer 41 is provided on the front surface corresponding to the opening of the outflow passage 40. Therefore, the presence or absence of the coolant flowing out from the opening of the outflow passage 40 can be more easily visually inspected by the discoloration of the display layer 41.

(6) In this spindle inspection method, the seal inspection tool 38 is held in the tool magazine 22. The seal inspecting tool 38 is exchanged with the tool holder 19 by the tool exchanging arm 24 and attached to the spindle 17, so that the coolant leaking from the spindle 17 is inspected. For this reason, the tool change arm 24 causes the seal inspection tool 38 to move to the tool holder 1 with respect to the spindle 17.
9 can be easily replaced and installed, and a coolant leak inspection can be automatically performed.

(Second Embodiment) Next, a second embodiment of the present invention will be described focusing on the points different from the first embodiment.

In the second embodiment, as shown in FIG.
As shown in, the holding cylinder 27 is fixed inside the tip of the main shaft 17, and an openable and closable collet 44 is supported on the inner surface of the peripheral wall thereof. An engagement cylinder 45 is attached to the lock rod 31 at the tip of the coolant rod 30, and an inclined surface 45 a for opening and closing the collet 44 and the recess 4 are attached to the outer peripheral surface thereof.
5b is formed. On the back surface of the tool holder 19 to which the tool 18 is attached and the seal inspection tool 38, a locking cylinder 39 is provided in a protruding manner, and an engagement recess 39a capable of engaging with the collet 44 is formed on the inner surface of the peripheral wall thereof.

Then, with the tool holder 19 or the seal inspection tool 38 mounted on the spindle 17, the lock rod 3
1 is urged to move in the collapsing direction, so that collet 4
4 is opened in a diameter-expanded state in correspondence with the inclined surface 45a of the engagement cylinder 45, and is engaged with the engagement recess 39a of the locking cylinder 39. By this engagement, the tool holder 19 or the seal inspection tool 38
Is locked and held in the mounted state with respect to the main shaft 17. Also,
When the lock rod 31 is moved in the protruding direction by a cylinder (not shown), the collet 44 is closed in a reduced diameter state in correspondence with the recess 45b of the engagement cylinder 45, and the locking cylinder 3
The engagement of 9 with the engagement recess 39a is released. By this release, the tool holder 19 or the seal inspection tool 38 is unlocked from the main shaft 17, and they can be removed from the main shaft 17.

The tool holder 19 and the seal inspection tool 38
A cylindrical protrusion 46 as an engaging portion is formed in the center of the back surface of the protrusion, and the protrusion 46 is inserted into the engaging cylinder 45 when the holder 19 is attached to the main shaft 17.
The sealing material 47 is provided in the annular groove 45c on the inner surface of the tip of the engagement cylinder 45.
The seal member 47 holds the seal between the joint surfaces of the protrusion 46 and the engagement cylinder 45.

Also in this embodiment, similarly to the first embodiment, the outflow passage 40 is formed in the seal inspection tool 38, and the display layer 41 is formed by coating on the front surface of the seal inspection tool 38. . Then, the seal inspection tool 38
Is attached to the main shaft 17, the coolant supply passage 3
When the seal member 47 is worn and coolant leaks in the main shaft 17 when the coolant is supplied to the coolant 2, the coolant flows out to the front surface of the seal inspection tool 38 through the outflow passage 40. It At this time, the display layer 41 is discolored, and the leakage of the coolant is displayed.

Therefore, according to the second embodiment, in addition to the effects described in (1) to (3), (5) and (6) in the first embodiment, the following effects are obtained. Can be obtained.

(7) The seal inspection tool 38 is provided with the cylindrical projection 46, and the seal material 47 is engaged with the outer peripheral surface of the projection 46 to inspect the seal material 47.
For this reason, even if the sealing material 47 is arranged at a position such as an inner wall surface of a cylinder that is difficult to see, the inspection of the sealing material 47 can be accurately performed.

(Third Embodiment) Next, a third embodiment of the present invention will be described focusing on parts different from the first embodiment.

In the third embodiment, as shown in FIG.
As shown in, a collet 44, which is substantially the same as that of the second embodiment, is provided in the main shaft 17. At the base ends of the tool holder 19 to which the tool 18 is attached and the seal inspection tool 38,
Pull studs 48 that can be engaged with the collet 44 are provided in a protruding manner. Then, the tool holder 19 or the seal inspection tool 3
When the 8 is mounted on the spindle 17, this pull stud 48
Is brought into contact with the tip surface of the coolant rod 30. In this state, the collet 44 is engaged with the pull stud 48, so that the tool holder 19 or the seal inspection tool 38 is locked and held in the mounted state with respect to the spindle 17.

A seal member 49 is fitted in the annular groove 30a on the tip end surface of the coolant rod 30, and by this seal member 49, the pull stud 48 and the coolant rod 3 are attached.
The seal between the contact surfaces with 0 is retained. When the seal inspection tool 38 is attached to the main shaft 17 and coolant is supplied to the coolant supply passage 32, when the seal member 49 is worn and coolant leaks in the main shaft 17. The coolant is discharged to the front surface of the seal inspection tool 38 via the outflow passage 40. At this time, the display layer 41 is discolored, and the leakage of the coolant is displayed.

Therefore, according to the third embodiment, it is possible to obtain the same effects as the effects described in (1) to (3), (5) and (6) in the first embodiment. (Modification) The present embodiment can be modified and embodied as follows.

In the second and third embodiments,
As in the first embodiment, the hollow portion 38b is formed inside the seal inspection tool 38. -In the said 1st Embodiment, similarly to 2nd and 3rd Embodiment, the seal | sticker inspection tool 38 is formed in the solid shape without the hollow part 38b.

In each of the above embodiments, the coolant outflow passage 40 is opened to a side surface other than the front surface of the seal inspection tool 38. -In a machine tool that does not include the tool changer 20, the worker may use the seal inspection tool 38 of each of the above-described embodiments as needed.
Attach the to the main shaft 17 and use the method of inspecting for coolant leakage.

A sensor for detecting coolant leakage is provided in the outflow passage 40 of the seal inspection tool 38, and a notification means such as a lamp is operated based on the detection of the sensor.

[0059]

As described above in detail, the present invention has an excellent effect that the structure of the spindle device is simple and that the leakage of the coolant inside the spindle can be clearly inspected. Demonstrate.

[Brief description of drawings]

FIG. 1 is a side view of a machine tool including a seal inspection tool according to a first embodiment.

FIG. 2 is a front view of the machine tool of FIG.

FIG. 3 is an enlarged cross-sectional view of main parts showing a spindle device of the machine tool of FIG. 1.

FIG. 4 is a cross-sectional view of essential parts in a state where a seal inspection tool is attached to the spindle device of FIG.

FIG. 5 is a cross-sectional view of essential parts showing a mounted state of the seal inspection tool according to the second embodiment.

FIG. 6 is a cross-sectional view of essential parts showing a mounted state of a seal inspection tool according to a third embodiment.

[Explanation of symbols]

16 ... Spindle head, 17 ... Spindle, 18 ... Tool, 19 ... Tool holder, 20 ... Tool changer, 22 ... Tool magazine,
24 ... Tool exchange arm, 24a ... Tool gripping part, 30 ... Coolant rod, 32, 33 ... Coolant supply channel, 38 ... Seal inspection tool, 38a ... Gripping groove part, 38b ... Hollow part, 40 ... Outflow path , 41 ... Display layers as display means, 47, 49 ... Sealing members.

Claims (8)

[Claims] 1. A coolant leakage prevention system for a machine tool, wherein coolant is supplied to the tip of a tool through coolant supply channels provided inside the spindle, inside the tool holder and inside the rear portion, respectively. A seal inspecting tool for inspecting wear of a seal, comprising an outflow passage for outflowing a coolant leaking from a seal portion on the spindle side to the outside in a state where the seal holder is exchanged with the tool holder and mounted on the spindle. A seal inspection tool characterized by being provided. 2. An engagement portion that engages with a seal provided on the main shaft side is provided, and the outflow passage is arranged at a position where the coolant leaking from between the seal and the engagement portion flows out to the outside. The seal inspection tool according to claim 1, wherein: 3. The seal inspection tool according to claim 1, wherein a groove for gripping is formed on the outer circumference. 4. The seal inspection tool according to claim 1, wherein the outflow passage is open toward the front surface. 5. The seal inspection tool according to claim 1, wherein a hollow portion is provided inside. 6. The display means for displaying the leakage of the coolant is provided at least on the surface corresponding to the opening of the outflow passage, according to any one of claims 1 to 5. Seal inspection tool. 7. A seal inspection tool according to claim 1, wherein the seal inspection tool according to any one of claims 1 to 5 is mounted on a main shaft, and a seal provided on the main shaft and a seal inspection tool engaged with the seal. A method for inspecting a seal in a spindle device of a machine tool, characterized by inspecting a leakage of a coolant from between an engaging portion of the machine tool. 8. The seal inspection tool according to any one of claims 3 to 6 is held in a tool magazine,
Replace the seal inspection tool with the tool holder by the tool change arm and attach it to the spindle, and inspect the coolant leakage between the seal of the spindle and the engagement part of the seal inspection tool that engages with the seal. Seal inspection method for machine tool spindle devices.