JP2014037024A - Boring tool and boring machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring tool which ensures the supply of a cutting liquid even in large diameter boring and achieves simple device structure, and to provide a boring machine tool.SOLUTION: A boring tool 20 includes: a shank 21 connected with a spindle of a machine tool 10; an arm 22 which is supported by the shank 21 and extends in a radial direction relative to a rotation axis line A of the spindle 11; and a blade edge 23 which is supported by a tip of the arm 22 and cuts a workpiece W. The boring tool 20 includes: a tank 25 which is installed at the arm 22 and stores the cutting liquid L therein; and a pipe 26 which continues from the tank 25 to the blade edge 23.

Description

  The present invention relates to a boring tool and a boring machine tool, and more particularly to a tool and a machine tool for boring a large-diameter workpiece.

Conventionally, in order to perform boring on a workpiece, a machine tool such as a boring machine is used, a boring tool is mounted on the spindle, and the inner surface of the workpiece is cut with the cutting edge of the tool.
In the cutting process, a cutting fluid is supplied to a cutting part of a workpiece by a cutting edge, and the part is appropriately cooled and lubricated.

As a machine tool for supplying such a cutting fluid, for example, a machine tool having a device for disposing a nozzle toward a cutting edge of a tool on a spindle head holding a spindle and injecting the cutting fluid from the nozzle is known. (See Patent Document 1).
In addition, some machine tools have a supply path for supplying air or cutting fluid to the center of the spindle (center through type). When using such a machine tool, the cutting fluid supplied from the spindle of the machine tool can be supplied to the cutting edge through the supply path by forming a supply path in the tool mounted on the spindle ( Patent Document 2).

Japanese Patent Application Laid-Open No. 11-347885 JP 2011-73102 A

By the way, in the boring process, when the hole diameter to be machined is large, a boring tool having an arm extending in the radial direction of the main shaft is used, and this is rotated by the main shaft so that the tip of the tip has a large diameter. It circulates along the circumference.
In such a large-diameter boring process, the cutting edge moves greatly with respect to the spindle and the spindle head. For this reason, when trying to inject the cutting fluid using the nozzle method described above, since the distance from the spindle head to the cutting edge is wide and the range of movement is wide, it is not possible to handle several nozzles that are usually installed on the spindle head. Disappear.
On the other hand, it is conceivable to install nozzles in the vicinity of the workpiece, not the spindle head, and to arrange a large number of nozzles along the boring part of the workpiece. Is complicated and difficult in practice.
On the other hand, it is sufficient if the cutting fluid can be supplied to the cutting edge in a concentrated manner, and it is preferable if a nozzle can be installed in the tool. However, it is preferable that the cutting tool rotates with the spindle, especially at the tip of a large-diameter boring tool with a large moving distance. It is practically difficult to install the nozzle.

In this respect, in the machine tool capable of supplying the cutting fluid from the above-described main spindle, a supply path is formed in the boring tool, so that even a large-diameter boring process in which the moving distance of the cutting edge is large can be dealt with.
However, not all machine tools have a function to supply cutting fluid to the spindle. In particular, it is necessary to modify a machine tool that does not have a supply function to add the same function. There are also difficulties.
As described above, in conventional boring tools and boring machine tools, it is difficult to appropriately supply the cutting fluid when performing large-diameter boring processing. There is a problem that an operator cannot avoid the work of manually supplying the cutting fluid to the cutting edge.

  An object of the present invention is to provide a boring tool and a boring machine tool that can reliably supply cutting fluid and have a simple apparatus configuration even in a large-diameter boring process.

  A boring tool according to the present invention includes a shank connected to a spindle of a machine tool, an arm supported by the shank and extending in a radial direction with respect to a rotation axis of the spindle, and supported by a tip of the arm. A boring tool having a cutting edge to be cut, the tank having a tank installed in the arm and storing cutting fluid therein, and a pipe continuous from the tank to the cutting edge.

In the present invention, the boring tool is mounted on the spindle of the machine tool and the spindle is rotated, so that the arm turns and the tip of the tip performs a circumferential motion. Thereby, boring can be performed on the workpiece with the cutting edge, and large diameter boring can be performed by increasing the length of the arm.
At this time, if the cutting fluid is stored in the tank, the cutting fluid is urged toward the distal end side of the arm by centrifugal force as the arm turns, and is sent out toward the cutting edge through the pipe. Thereby, when the boring process by a blade edge | tip is performed, the cutting fluid can be supplied to the blade edge | tip which cuts a workpiece | work.
As described above, according to the present invention, the cutting fluid can be reliably supplied even in a large-diameter boring process with a simple apparatus configuration.

The boring tool of the present invention preferably includes a valve body capable of opening and closing the pipe in the middle of the pipe, and an urging means for urging the valve body toward the rotation axis.
In the present invention, the valve body moves against the urging means when machining, that is, when centrifugal force is working, and the valve body is attached when not working, that is, when centrifugal force is not working. It is held at a fixed position by the biasing means. Therefore, if the valve body is arranged so that the pipe is opened at the time of machining and closed at the time of non-machining, the cutting fluid flows through the pipe only at the time of machining, and the outflow of the cutting fluid can be blocked at the time of non-machining. it can.
Thereby, even when the cutting edge is directed downwardly at the time of non-machining, inconveniences such as leakage of cutting fluid due to gravity can be avoided.

In the boring tool of the present invention, it is desirable to have a replenishment pipe that communicates the surface of the arm with the inside of the tank.
In the present invention, when the cutting fluid in the tank decreases, the cutting fluid can be replenished from the outside through the replenishment pipe.
At this time, if a replenishment bottle is installed in a part of the machine tool and a pump type bottle that discharges the content liquid by pushing the nozzle as this replenishment bottle is used, the arm is moved by the operation of the machine tool, By pushing the nozzle while the supply pipe is in contact with the nozzle of the supply bottle, the cutting fluid in the supply bottle can be transferred into the tank, and the machine tool is automatically used regardless of the manual operation of the operator. In addition, the cutting fluid can be replenished.

In the boring tool according to the present invention, it is preferable that the tank is a cassette-type tank that is detachable from the arm.
In such this invention, when the cutting fluid in a tank reduces, a tank can be taken out from an arm and cutting fluid can be replenished.
At this time, if a plurality of cassette-type tanks are prepared, when the tank in use becomes empty, it can be immediately replaced with another tank, minimizing the work time for replenishing the cutting fluid. Can be suppressed.
If the cassette-type tank is replaced with another robot arm or the like, the machine tool can automatically supply the cutting fluid regardless of the manual operation of the operator.

A boring machine tool according to the present invention includes a rotatable main shaft, an arm supported by the main shaft and extending in a radial direction with respect to a rotation axis of the main shaft, and a cutting edge supported by a tip of the arm to cut the workpiece. And a tank that is installed in the arm and stores cutting fluid therein, and a pipe that continues from the tank to the cutting edge.
In the present invention as described above, it is possible to obtain the same effects as those described for the boring tool of the present invention described above.

In the boring machine tool of the present invention, the arm has a supply pipe that communicates the surface of the arm and the inside of the tank, and the supply that can be connected to the supply pipe at a position where the arm can approach. It is desirable that a bottle is installed.
In the present invention, when the cutting fluid in the tank is reduced, the cutting fluid can be replenished from the external replenishment bottle through the replenishment pipe.
At this time, if a pump-type bottle that discharges the liquid by pushing the nozzle as a replenishment bottle is used, the arm is moved by the operation of the machine tool and the replenishment pipe is in contact with the nozzle of the replenishment bottle. By pushing the nozzle, the cutting fluid in the replenishment bottle can be transferred into the tank, and the machine tool can automatically replenish the cutting fluid regardless of the manual operation of the operator.

The side view which shows 1st Embodiment of this invention. The front view which shows the said 1st Embodiment. The side view which shows 2nd Embodiment of this invention. The front view which shows the said 2nd Embodiment.

[First Embodiment]
1 and 2 show a first embodiment of the present invention.
In the first embodiment, the machine tool 10 is a boring machine tool provided with a boring tool 20 according to the present invention, and the boring tool 20 is supplied with a cutting fluid L from an external supply bottle 30. It is configured.

In FIG. 1, a machine tool 10 is for boring the inner surface of a cylindrical recess W1 formed on the surface of a workpiece W, and the workpiece W is fixed to a table (not shown). The machine tool 10 has a main shaft 11 that can move relative to a table. The main shaft 11 is rotatably supported by a main shaft head 12 and is driven to rotate by a motor (not shown).
The boring tool 20 is attached to the tip of the main shaft 11 and is used for boring the inner surface of the concave portion W1 of the workpiece W.

The boring tool 20 includes a shank 21 connected to the tip of the main shaft 11, an arm 22 supported by the shank 21 and extending in the radial direction with respect to the rotation axis A of the main shaft 11, and a work supported by the tip of the arm 22. A cutting edge 23 for cutting W.
The shank 21 is a standard tapered shank. However, not only a standard taper shank but also the form, structure, etc. are not limited as long as it can be attached to the tip of the main shaft 11.

The arm 22 is a prismatic member extending in the radial direction with respect to the rotation axis A, and is welded or bolted to the shank 21. The arm 22 may be a columnar shape or a long material having a C-shaped cross section opened in one direction.
The cutting edge 23 is a cutting tool made of cemented carbide, and is fixed to the arm 22 with a bolt or the like, for example.

The boring tool 20 includes a tank 25 that is formed on the arm 22 and stores the cutting fluid L therein, and a pipe 26 that continues from the tank 25 to the cutting edge 23.
The tank 25 is formed by forming a cavity inside the arm 22 in a section between the cutting edge 23 of the arm 22 and the shank 21. In forming the cavity, the prism 22 may be cut from one side surface of the prism-shaped member used for the arm 22 and the side surface may be sealed after the cavity is formed. The open surface may be sealed using a C-shaped member. Alternatively, a prismatic hollow member may be used as the arm 22 and both ends thereof may be sealed.
1 and 2 show a state in which the main shaft 11 and the boring tool 20 are rotated, and the cutting fluid L in the tank 25 is drawn in a state where it is accumulated on the blade edge 23 side by centrifugal force.

In the present embodiment, the pipe 26 is a passage drilled in the arm 22, and includes a first section 261 extending from the tank 25 in the longitudinal direction of the arm 22, and the arm 22 in the vicinity of the cutting edge 23 perpendicular to the first section 261. It is comprised with the 2nd area 262 opened to a side surface.
In the middle of the pipe 26, an opening / closing valve 27 is installed at the intersection of the first section 261 and the second section 262.

The on-off valve 27 includes a spherical valve body 271, a valve chamber 272 that houses the valve body 271, and a spring 273 as an urging means that maintains the valve body 271 in the closed position.
The valve chamber 272 forms a cylindrical space that is formed and communicated with the first section 261, and the second section 262 is opened near the first section 261 on the inner peripheral surface of the valve chamber 272.
The valve body 271 is a steel ball or the like having a relatively large weight. When the valve body 271 is on the first section 261 side, the valve body 271 closes the opening of the first section 261 to the valve chamber 272 and also blocks the opening of the second section 262. Therefore, the distribution of the pipe 26 can be blocked.

The spring 273 presses the valve body 271 toward the first section 261, that is, in the direction of the rotation axis A, and normally maintains the pipe 26 blocked by the valve body 271. However, the biasing force of the spring 273 is adjusted according to the mass of the valve body 271, and when the boring tool 20 is driven to rotate, the centrifugal force acting on the valve body 271 exceeds the biasing force of the spring 273. The valve body 271 is set so as to move to the blade edge 23 side of the valve chamber 272.
When the valve body 271 moves as described above, the openings of the first section 261 and the second section 262 are opened, the pipe 26 is unblocked, and the pipe 26 extending from the tank 25 to the cutting edge 23 is conducted. The

In the arm 22, a replenishment pipe 28 that connects the end surface of the arm 22 and the inside of the tank 25 is formed adjacent to the opening / closing valve 27.
The replenishment pipe 28 has an opening 281 that opens at the end face of the arm 22, and a check valve that prevents backflow from the replenishment pipe 28 is formed in the opening 281.
With this supply pipe 28, when the cutting fluid L in the tank 25 decreases, the cutting fluid L can be supplied from the outside.

The machine tool 10 of the present embodiment includes a replenishment bottle 30 for automatically performing replenishment of the cutting fluid L from the replenishment pipe 28 by the operation of the machine tool 10.
The supply bottle 30 is fixed to a part of the table that supports the workpiece W. The replenishing bottle 30 may be one that is fixed to the upper surface of the table that supports the workpiece W, or one that is detachable and replaceable with a magnet, a planar fastener, or the like. Further, not only the upper surface of the table that supports the workpiece W, but also a shelf that protrudes from the side surface of the table may be formed and fixed thereto, or may be supported by an arm or the like protruding from the side surface of the table. The installation position of the replenishment bottle 30 may be within a range where the boring tool 20 can be reached by the operation of the machine tool 10.

The supply bottle 30 stores the cutting fluid L therein and can be connected to the opening 281 of the supply pipe 28 via the nozzle 31. The replenishing bottle 30 has a structure similar to that of a pump-type bottle that is generally used as a container for hand-washing liquid soap and the like, and when the nozzle 31 is pressed, the cutting fluid L stored therein is discharged.
Accordingly, the boring tool 20 is moved by operating the machine tool 10, the tip of the arm 22 on the blade edge 23 side faces the supply bottle 30, the opening 281 is brought close to the nozzle 31, and the nozzle 31 is further connected. The cutting fluid L is discharged by pushing in 31, and this cutting fluid L can be supplied into the tank 25 from the supply pipe 28.

In this embodiment, the following effects can be obtained.
The boring tool 20 is mounted on the main shaft 11 of the machine tool 10 and the main shaft 11 is rotated, whereby the arm 22 turns and the cutting edge 23 at the tip performs a circumferential motion. Thereby, the boring process can be performed on the workpiece W with the cutting edge 23. And the large diameter boring process can be performed by taking the length of the arm 22 large.
At this time, if the cutting fluid L is stored in the tank 25, the cutting fluid L is urged toward the distal end side of the arm 22 by centrifugal force as the arm 22 turns, and is directed toward the cutting edge 23 through the pipe 26. Sent out. Thereby, when the boring with the cutting edge 23 is executed, the cutting fluid L can be supplied to the cutting edge 23 that cuts the workpiece W.
Therefore, in this embodiment, the cutting fluid L can be reliably supplied even in a large-diameter boring process with a simple apparatus configuration.

In the present embodiment, the opening / closing valve 27 having the valve body 271 that can open and close the pipe 26 and the spring 273 as the biasing means that biases the valve body 271 toward the rotation axis A is provided in the middle of the pipe 26. When processing, that is, when centrifugal force is applied, the valve body 271 moves against the spring 273. When not processing, that is, when centrifugal force is not applied, the valve body 271 is moved to a fixed position by the spring 273. Retained. Since the valve body 271 is arranged such that the pipe 26 is opened at the time of machining and the pipe 26 is closed at the time of non-machining, the cutting fluid L circulates through the pipe 26 only at the time of machining. Outflow can be blocked.
Thereby, even if the cutting edge 23 faces downward in the non-machining state, it is possible to avoid inconveniences such as the cutting fluid L leaking due to gravity.

In this embodiment, since the replenishment pipe 28 that communicates the surface of the arm 22 and the inside of the tank 25 is provided, the cutting fluid L is replenished from the outside through the replenishment pipe 28 when the cutting fluid L in the tank 25 decreases. can do.
In particular, a replenishment bottle 30 is installed in a part of the machine tool 10, and a pump-type bottle from which content liquid is discharged by pushing a nozzle 31 is used as the replenishment bottle 30. The cutting fluid L in the replenishment bottle 30 can be transferred into the tank 25 by pushing the nozzle 31 with the replenishment pipe 28 applied to the nozzle 31 of the replenishment bottle 30. The machine tool can automatically supply the cutting fluid L regardless of the manual operation.

[Second Embodiment]
3 and 4 show a second embodiment of the present invention.
In the second embodiment, the machine tool 10A is a boring machine tool provided with a boring tool 20A according to the present invention. The boring tool 20A uses a replaceable cassette type tank 25A, whereas the boring tool 20 of the first embodiment receives replenishment of the cutting fluid L from the external replenishment bottle 30. Is.

In the machine tool 10A of this embodiment, the replenishment bottle 30 installed in the machine tool 10 of the first embodiment is omitted, but the spindle 11, the spindle head 12 and the like constituting the machine tool 10A are the first embodiment described above. It is the same as the form. For this reason, the overlapping description is abbreviate | omitted about a common structure.
In the boring tool 20A of the present embodiment, the shank 21 and the cutting edge 23 are common to the boring tool 20 (see FIG. 1) of the first embodiment. However, the arm 22A has the same outer shape, material, dimensions, etc. as the arm 22 of the first embodiment, but the replenishing pipe 28 (see FIG. 1) is omitted, and the tank 25A and the pipe 26A are also configured differently. Yes.

The boring tool 20A includes a tank 25A that is formed on the arm 22A and stores the cutting fluid L therein, and a pipe 26A that continues from the tank 25A to the cutting edge 23.
In this embodiment, the tank 25 </ b> A is configured inside a tank cassette 40 that is detachable and replaceable.
The tank cassette 40 is a long columnar or columnar material, and a cavity serving as a tank 25A is formed inside.

A cavity 41 for accommodating the tank cassette 40 is formed in the arm 22A.
The cavity 41 is opened on one side surface of the arm 22A, and the tank cassette 40 can be taken in and out of the cavity 41 from the outside. The opening of the cavity 41 is preferably one of the three surfaces of the arm 22A excluding the side surface to which the shank 21 is connected.

A third section 263 communicating with the tank 25A is formed at one end of the tank cassette 40 (the side facing the blade edge 23).
In the arm 22A, a first section 261 and a second section 262 of the pipe 26A are formed as in the first embodiment. The first section 261 of the second section 262 is opened on the inner surface of the cavity 41.
When the tank cassette 40 is mounted in the cavity 41, that is, in the arm 22A, the third section 263 of the tank cassette 40 is connected to the second section 262 that opens to the inner surface of the cavity 41, thereby the first section 261 to the second section. A series of three sections 263 form a pipe 26A extending from the tank 25A to the vicinity of the blade edge 23.

In the tank cassette 40, an on-off valve 27A is installed in the middle of the third section 263. The on-off valve 27A has the same configuration as that of the first embodiment, although the installation position is different.
The on-off valve 27A includes a spherical valve body 271, a valve chamber 272 that accommodates the valve body 271, and a spring 273 as an urging means that maintains the valve body 271 in the closed position.
The valve chamber 272 is a cylindrical space having a diameter larger than that of the third section 263 on the same axis as the third section 263.
The valve body 271 is a steel ball or the like having a relatively large weight, and closes the opening of the third section 263 when it is on the tank 25A side, thereby blocking the flow of the pipe 26A.

The spring 273 presses the valve body 271 toward the tank 25A, that is, toward the rotation axis A with the tank cassette 40 mounted in the cavity 41, and normally maintains the pipe 26A blocked by the valve body 271. However, the biasing force of the spring 273 is adjusted according to the mass of the valve body 271, and when the boring tool 20 </ b> A is driven to rotate, the centrifugal force acting on the valve body 271 exceeds the biasing force of the spring 273. The valve body 271 is set so as to move to the blade edge 23 side of the valve chamber 272.
When the valve body 271 moves as described above, the shutoff of the pipe 26A by the on-off valve 27A is released, and the pipe 26A from the tank 25A to the blade edge 23 is conducted.

In this embodiment, the following effects can be obtained.
Also in the present embodiment, the cutting fluid L can be reliably supplied even in a large-diameter boring process with a simple apparatus configuration as in the first embodiment described above.
That is, by mounting the boring tool 20A on the main shaft 11 of the machine tool 10A and rotating the main shaft 11, the arm 22A turns and the cutting edge 23 at the tip makes a circumferential motion. Thereby, the boring process can be performed on the workpiece W with the cutting edge 23. A large diameter boring process can be performed by increasing the length of the arm 22A.
At this time, if the cutting fluid L is stored in the tank 25A, the cutting fluid L is urged toward the distal end side of the arm 22A by centrifugal force as the arm 22A rotates, and toward the cutting edge 23 through the pipe 26A. Sent out. Thereby, when the boring with the cutting edge 23 is executed, the cutting fluid L can be supplied to the cutting edge 23 that cuts the workpiece W.

Also in the present embodiment, as in the first embodiment described above, the on-off valve 27A is opened and closed depending on the presence or absence of operation, and the cutting fluid L flows through the pipe 26A only during machining, and the cutting fluid L flows out when not machining. Can be cut off.
Thereby, even when the cutting edge 23 faces downward in the machine tool 10A during non-machining, inconveniences such as leakage of the cutting fluid L due to gravity can be avoided.

In the present embodiment, the cutting fluid L cannot be replenished by the replenishment pipe 28 and the replenishment bottle 30 as in the first embodiment, but the cutting fluid L can be replenished quickly by replacing the tank cassette 40.
That is, in this embodiment, when the cutting fluid L in the tank 25A decreases, the tank cassette 40 can be taken out from the arm 22A and the cutting fluid L can be replenished.
At this time, if a plurality of tank cassettes 40 are prepared, the tank cassette 40 in use can be immediately replaced with another tank cassette 40 when the used tank cassette 40 becomes empty, and work for replenishing the cutting fluid L can be performed. Time can be minimized.
Further, if the tank cassette 40 is replaced with another robot arm or the like, the machine tool can automatically supply the cutting fluid regardless of the manual operation of the operator.

[Modification]
The present invention is not limited to the above-described embodiments, and modifications and the like without departing from the object of the present invention are included in the present invention.
For example, the opening positions of the pipes 26 and 26A for supplying the cutting fluid L to the cutting edge 23 (the opening positions on the surfaces of the arms 22 and 22A of the first section 261) may be changed as appropriate, and the boring tools 20 and 20A are rotationally driven. It is desirable that the cutting fluid L flowing out from the pipes 26 and 26A is adjusted so that the cutting edge L is appropriately applied to the cutting edge 23 when in the machining state.

  The boring tools 20 and 20A are not limited to those having the cutting edge 23 only at one end of the arms 22 and 22A, and the cutting edge 23 may be provided at both ends thereof. In such a case, it is desirable to install the pipes 26, 26A or tanks 25, 25A according to the present invention for each cutting edge 23 so that the cutting fluid L is reliably supplied by centrifugal force. .

The tanks 25 and 25A are not limited to those configured as cavities in the arms 22 and 22A, or are configured as cavities in the tank cassette 40. For example, containers such as commercially available PET bottles for beverages can be used as appropriate. You may comprise by connecting.
In addition, the detailed shape, dimensions, material, and the like of each part can be appropriately changed in implementation.

In the first embodiment, the replenishment pipe 28 that communicates with the inside of the tank 25 is provided on the end face of the arm 22 on the cutting edge 23 side. However, the replenishment pipe 28 may be formed on the end face opposite to the cutting edge 23. . In this case, as the replenishment bottle 30, a bottle with the nozzle 31 facing upward can be used as in the first embodiment.
On the other hand, the replenishment pipe 28 communicating with the inside of the tank 25 may be formed in any direction on the side surface of the arm 22. In this case, the replenishment bottle 30 is such that the nozzle 31 is horizontally oriented, the arm 22 is moved in the horizontal direction, the opening 281 of the replenishment pipe 28 is connected to the nozzle 31, and the nozzle 31 is further pushed in The cutting fluid L may be transferred.

DESCRIPTION OF SYMBOLS 10, 10A ... Machine tool 11 ... Spindle 12 ... Spindle head 20, 20A ... Boring tool 21 ... Shank 22, 22A ... Arm 23 ... Cutting edge 25, 25A ... Tank 26, 26A ... Pipe 261 ... First section 262 ... Second Section 263 ... Third section 27, 27A ... On-off valve 271 ... Valve body 272 ... Valve chamber 273 ... Spring 28 as urging means ... Supply pipe 281 ... Opening 30 ... Supply bottle 31 ... Nozzle 40 ... Tank cassette 41 ... Cavity A ... Rotational axis L ... Cutting fluid W ... Workpiece W1 ... Concavity

Claims (6)

For boring having a shank connected to a spindle of a machine tool, an arm supported by the shank and extending in a radial direction with respect to the rotation axis of the spindle, and a cutting edge supported by the tip of the arm to cut a workpiece A tool,
A boring tool comprising: a tank that is installed on the arm and stores a cutting fluid therein; and a pipe that continues from the tank to the cutting edge. The boring tool according to claim 1,
A boring tool comprising: a valve body capable of opening and closing the pipe in the middle of the pipe; and urging means for urging the valve body toward the rotation axis. In the boring tool according to claim 1 or 2,
A boring tool comprising a replenishment pipe communicating the surface of the arm and the inside of the tank. In the boring tool according to claim 1 or 2,
A boring tool characterized in that the tank is a cassette-type tank which is detachable from the arm. A boring machine tool comprising: a rotatable main shaft; an arm supported on the main shaft and extending in a radial direction with respect to a rotation axis of the main shaft; and a cutting edge supported on a tip of the arm to cut the workpiece. And
A boring machine tool comprising a tank that is installed in the arm and stores cutting fluid therein, and a pipe that continues from the tank to the cutting edge. In the boring machine tool according to claim 5,
The arm has a supply pipe that communicates the surface of the arm and the inside of the tank,
A boring machine tool, wherein a replenishing bottle connectable to the replenishing pipe is installed at a position where the arm can approach.

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