JP2012200826A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool, which is capable of preventing the air around a shaft coupling from diffusing to the entire region in a cavity, and which is capable of inhibiting the whole interior of a head from rising in temperature.SOLUTION: An angular ball bearing 2 is held in a bearing hole 13 through which a lower part of the head 1 having a cavity 12 passes. A lower end of a tool holding shaft 3 is fitted into and held by the angular ball bearing 2. An upper end 3f of the tool holding shaft 3 on the cavity 12 side is interlocked and coupled with an electric motor 4 via the shaft coupling 5. A regulation wall 19 for regulating an air flow occurring by rotation of the shaft coupling 5 is provided at a position facing the shaft coupling 5 inside the cavity 12, so that the regulation wall 19 can prevent the air around the shaft coupling 5 from diffusing to the entire region in the cavity 12.

Description

  The present invention relates to a machine tool in which a tool holding shaft is rotatably held by a head portion.

  A machine tool holds a plurality of bearings at two positions spaced apart in the axial direction of a concentric axis, and has a box-shaped head having a bearing hole penetrating vertically and a cavity in which an upper end of the bearing hole is opened A tool holding shaft whose upper end is disposed in the cavity, whose lower end is fitted and held in each of the bearings, and whose rotation center is up and down, and an electric motor mounted on the upper outer side of the head part, A shaft coupling that interlocks and connects the drive shaft of the electric motor and the upper end of the tool holding shaft within the cavity, and a rotary machining such as a drill that is pivotally attached to the cavity and held at the lower end of the tool holding shaft. And a lever for unclamping the tool, and rotating the tool holding shaft continuously at a relatively high speed by driving an electric motor, rotating the rotary processing tool held at the lower end of the tool holding shaft, Is configured to rotate And it is (for example, see Patent Document 1).

  The head part has a long box shape in the front and rear, a bearing cylinder part having a bearing hole is arranged in the lower part on the front side, and the inside of the other parts excluding the bearing cylinder part is a substantially sealed cavity, The long central portion of the lever is pivotally attached to the central portion of the cavity.

  Bearings that are spaced apart in the vertical direction in the bearing hole are angular ball bearings, and lubrication oil is applied between the inner and outer rings to increase the durability of the angular ball bearings. A screw ring that abuts the inner ring end surface of the upper angular ball bearing and applies axial preload to the tool holding shaft is screwed to prevent the tool holding shaft from rattling in the axial direction.

JP 2006-82175 A

  By the way, when rotating a plurality of workpieces while continuously rotating the tool holding shaft at high speed for a long time, the temperature rise of the angular ball bearing part becomes excessive, and the lubricating oil applied to the angular ball bearing deteriorates. Furthermore, the tool holding shaft is thermally expanded in the axial direction, the temperature difference between the inner ring and the outer ring of the angular ball bearing is increased, and the amount of thermal expansion of the inner ring in the axial direction is larger than that of the outer ring, The preload applied to the holding shaft is reduced. Due to the deterioration of the lubricating oil, the tool holding shaft cannot be rotated at high speed, and the tool holding shaft needs to be replaced. When the preload is lowered, the tool holding shaft is likely to rattle in the axial direction, the rigidity of the tool holding shaft is lowered, and the rotational machining capability is lowered.

  In addition, the electric motor for continuously rotating the tool holding shaft at a high speed for a long time generates heat, the heat of the electric motor is transmitted to the shaft coupling, the air around the shaft coupling is heated, and the heated air is Due to the rotation of the shaft coupling, it is diffused throughout the cavity, and the temperature inside the head portion rises, and the angular ball bearing portion is more likely to rise in temperature.

  The present invention has been made in view of such circumstances, and the main purpose is to provide a regulating wall that regulates the flow of air generated by the rotation of the shaft coupling at a position facing the shaft coupling inside the cavity. An object of the present invention is to provide a machine tool that can prevent the air around the shaft joint from being diffused throughout the cavity and suppress the temperature inside the entire head portion from rising.

  Another object is to quickly exhaust the air around the shaft coupling whose flow is regulated by the regulating wall from the exhaust port by arranging the exhaust port on the side wall of the head portion closer to the shaft coupling than the regulating wall. It is to provide a machine tool that can be used.

  Another object is to form a regulating wall between both side walls of the head part, so that the shaft joint can be surrounded by the wall part of the head part and the regulating wall, and the air in this enclosed space is exhausted from the exhaust port. An object of the present invention is to provide a machine tool capable of quickly exhausting from a machine.

  Another object is to form the regulating wall integrally with the both side walls of the head part, so that the regulating wall can be provided without increasing the number of parts, and the cost can be reduced while providing the regulating wall. It is to provide a machine tool that can be used.

  Another object is to provide an air blowing means for inserting a cylinder into the head portion and blowing air from the cylinder to the upper end side of the tool holding shaft, at a position separated from the peripheral surface of the tool holding shaft. And by disposing the cylinder at a position intersecting with the axis of the tool holding shaft, and opening a blower outlet on the peripheral surface of the hollow side tip of the cylinder, thereby connecting the upper end of the tool holding shaft and the shaft coupling. It is to provide a machine tool that can be gradually cooled with external air and can suppress the temperature rise of the tool holding shaft and the shaft coupling.

  In addition, by providing the outlets at a plurality of positions spaced apart in the longitudinal direction of the cylindrical body, the other object can be widely blown out toward the upper end side of the tool holding shaft without concentrating the blowing air. An object of the present invention is to provide a machine tool that can further suppress the temperature rise of the upper end portion and the shaft coupling.

  In the machine tool according to the present invention, a bearing is held in a bearing hole vertically passing through a lower portion of a head portion having a cavity, and a tool holding shaft is fitted and supported in the bearing, and the cavity of the tool holding shaft is In a machine tool whose upper end on the side is interlocked and connected to a drive source by a shaft coupling, a regulating wall that regulates the flow of air generated by the rotation of the shaft coupling at a position facing the shaft coupling inside the cavity It is characterized by providing.

  In the present invention, the flow of air in the cavity generated by the rotation of the shaft coupling can be regulated by the regulating wall, and the air around the shaft coupling can be prevented from diffusing throughout the cavity. Even when the drive source is an electric motor, the heat around the shaft coupling transmitted from the electric motor through the shaft coupling can be prevented from diffusing throughout the cavity, and the bearing Can be prevented from rising in temperature. Therefore, the deterioration of the lubricating oil applied to the bearing can be suppressed, the life of the bearing and the tool holding shaft can be extended, and the duration of the rotational machining capability can be increased.

Further, the machine tool according to the present invention is characterized in that an exhaust port is arranged on a side wall of the head portion closer to the shaft coupling than the regulating wall.
In the present invention, since the air around the shaft coupling whose flow is regulated by the regulating wall can be quickly exhausted from the exhaust port, it is better that the heat around the shaft coupling is diffused throughout the cavity. It is possible to prevent the temperature of the bearing from rising due to the heat around the shaft coupling.

The machine tool according to the present invention is characterized in that the restriction wall is formed between both side walls of the head portion.
In the present invention, the shaft joint can be surrounded by the wall portion of the head portion and the restriction wall, and the air in the surrounding space can be quickly exhausted from the exhaust port. It is possible to better prevent diffusion to the entire inner area, and to further suppress the temperature rise of the bearing due to the heat around the shaft coupling.

In the machine tool according to the present invention, the restriction wall is formed integrally with the both side walls.
In the present invention, the restriction wall can be provided without increasing the number of parts, and the cost can be reduced although the restriction wall is provided.

The machine tool according to the present invention further includes air blowing means for fitting a cylinder into the head portion and blowing air from the cylinder to the upper end side, and the cylinder includes the tool holding shaft. The air outlet is disposed at a position separated from the peripheral surface of the cylindrical body and at a position intersecting with the axis of the tool holding shaft, and a blow-out opening is formed on the peripheral surface of the hollow-side tip portion of the cylindrical body. .
In the present invention, the upper end of the tool holding shaft and the shaft joint can be gradually cooled with external air, the temperature rise of the tool holding shaft and the shaft joint can be suppressed, and the tool holding shaft Since the air that has cooled the upper end portion and the shaft coupling can be quickly exhausted from the exhaust port, it is possible to further suppress the temperature rise of the bearing due to the heat around the upper end portion and the shaft coupling.

The machine tool according to the present invention is characterized in that the air outlets are arranged at a plurality of positions spaced apart in the longitudinal direction of the cylindrical body.
In the present invention, it is possible to blow a wide range to the upper end portion side of the tool holding shaft without concentrating the blown air, further suppressing the temperature rise of the upper end portion and the shaft coupling, Since the air that has cooled the upper end of the tool holding shaft and the shaft joint can be quickly exhausted from the exhaust port, it is possible to further suppress the temperature rise of the bearing due to the heat around the upper end and the shaft joint. it can.

  According to the present invention, the flow of air in the cavity generated by the rotation of the shaft coupling can be regulated by the regulating wall, and the air around the shaft coupling can be prevented from diffusing throughout the cavity. The heat around the shaft joint can be prevented from diffusing throughout the cavity, and the temperature of the bearing can be prevented from rising due to the heat around the shaft joint. Therefore, the deterioration of the lubricating oil applied to the bearing can be suppressed, the life of the bearing and the tool holding shaft can be extended, and the duration of the rotational machining capability can be increased.

  Further, according to the present invention, the air around the shaft coupling whose flow is regulated by the regulating wall can be quickly exhausted from the exhaust port, and the heat around the shaft coupling is better diffused throughout the cavity. It is possible to prevent the temperature of the bearing from rising due to the heat around the shaft coupling.

  In addition, according to the present invention, the shaft joint can be surrounded by the wall portion and the restriction wall of the head portion, and the air around the shaft joint can be quickly exhausted from the exhaust port. It is possible to better prevent diffusion to the entire area of the cavity, and to further suppress the temperature rise of the bearing due to the heat around the shaft coupling.

  Further, according to the present invention, it is possible to provide a restriction air without increasing the number of parts, and it is possible to reduce the cost while providing a restriction wall.

  Further, according to the present invention, the upper end portion of the tool holding shaft and the shaft joint can be gradually cooled with external air, the temperature rise of the tool holding shaft and the shaft joint can be suppressed, and the tool holding shaft Since the air that has cooled the upper end portion and the shaft coupling can be quickly exhausted from the exhaust port, it is possible to further suppress the temperature rise of the bearing due to the heat around the upper end portion and the shaft coupling.

  Further, according to the present invention, it is possible to blow a wide range to the upper end side of the tool holding shaft without concentrating the blown air, and it is possible to further suppress the temperature rise of the upper end portion and the shaft coupling, Since the air that has cooled the upper end of the tool holding shaft and the shaft joint can be quickly exhausted from the exhaust port, it is possible to further suppress the temperature rise of the bearing due to the heat around the upper end and the shaft joint. it can.

It is a vertical side view which shows the structure of the head part of the machine tool which concerns on this invention. It is the II-II sectional view taken on the line of FIG. It is a front view which shows the structure of the head part of the machine tool which concerns on this invention. It is the perspective view which decomposed | disassembled one part which shows the structure of the head part of the machine tool which concerns on this invention. It is an expanded sectional view which shows the structure of the principal part of the machine tool which concerns on this invention. It is a perspective view which shows the structure of the control wall of the machine tool which concerns on this invention. It is a front view which shows the structure of the control wall of the machine tool which concerns on this invention. It is a perspective view which shows the structure of the cylinder of the machine tool which concerns on this invention. It is a front view which shows the structure of the cylinder of the machine tool which concerns on this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
1 is a longitudinal side view showing the configuration of a head portion of a machine tool according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a front view showing the configuration of the head portion, and FIG. FIG. 5 is an enlarged cross-sectional view showing a configuration of a main part.

  The machine tool shown in the figure holds two angular contact ball bearings 2 at two positions spaced apart in a concentric axial length direction, and a bearing cylinder portion 11 having a central axis vertically and the bearing cylinder portion. 11 is a box-shaped head portion 1 having a cavity 12 that is open on the upper side, and an upper end portion thereof is disposed in the cavity 12, and a lower end portion is fitted and held in each of the angular ball bearings 2, and the center of rotation is up and down. The tool holding shaft 3, the electric motor 4 that is mounted on the upper outside of the front portion of the head portion 1, and the drive shaft 41 is disposed in the cavity 12, and the upper end end of the tool holding shaft 3 and the drive shaft 41 are hollow. The shaft coupling 5 that is interlocked and connected in the shaft 12, the lever 6 that is pivotally mounted in the cavity 12 and holds the tool held by the lower end portion of the tool holding shaft 3, and the upper end portion side of the tool holding shaft 3. And a cylindrical body 7 for blowing out air.

  The machine tool also includes a base (not shown) on which a workpiece holding table is mounted so as to be movable in the lateral direction, and a column (not shown) fixed to the base. The part 1 is mounted so as to be movable in the vertical direction.

  The head portion 1 has a long box shape in front and rear, and a bearing tube portion 11 having a bearing hole 13 penetrating vertically is disposed at a lower portion on the front side (right side in FIG. 1). The inside of the other part excluding the bearing cylinder part 11 is a cavity 12. A first opening 14 is opened on the upper side of the bearing cylinder 11, and a second opening 15 is opened on the rear side of the first opening 14. The electric motor 4 is mounted in the first opening 14 so that the drive shaft 41 faces downward, and is closed by a flange 42 of the electric motor 4. The other end portion of the lever 6 pivotally attached to the second opening portion 15 is inserted into the second opening portion 15 and is closed by a flexible seal ring. The cavity 12 is almost sealed.

  The bearing tube portion 11 has a middle portion in the vertical direction continuous to the side walls 1 a and 1 a and an upper end portion disposed in the cavity 12. The lower end portion is disposed outside the cavity 12, and the cylindrical body 7 is disposed on the rear side of the upper end portion of the bearing tube portion 11.

  The bearing tube portion 11 has a large-diameter hole portion 13a on the upper end side, and a small-diameter hole portion 13b connected to the large-diameter hole portion 13a via a stepped portion. A step portion is formed at the boundary between the large diameter hole portion 13a and the small diameter hole portion 13b, and a retaining ring is locked to the step portion. The outer rings of the two angular ball bearings 2 and 2 are fitted and held on the upper side of the small-diameter hole 13b, and the outer rings of the two angular ball bearings 2 and 2 are fitted and held on the lower side of the small-diameter hole 13; The large and small cylindrical spacers 16 and 16 are fitted between the angular ball bearings 2 and 2. The lower end portion of the tool holding shaft 3 is fitted into the inner rings of the angular ball bearings 2 and 2.

  A through hole 17 is opened at a position behind the upper end portion of the bearing tube portion 11 below the one side wall 1 a of the head portion 1, and a cylindrical body that is substantially orthogonal to the axis of the tool holding shaft 3 in the through hole 17. 7 is inserted. The flow of air generated by the rotation of the exhaust port 18 and the shaft coupling 5 is regulated at a position spaced apart from the shaft coupling 5 on the upper side of the one side wall 1a, so that the heat around the shaft coupling 5 is spread throughout the cavity. A restriction wall 19 for preventing diffusion is provided, and an exhaust pipe 20 is connected to the exhaust port 18.

  The rear outside of the head unit 1 has a screw shaft whose rotation center is up and down, a screw ring screwed into the screw shaft so as to be relatively rotatable, and a second electric motor that rotates the screw shaft forward and backward. It is attached to a mechanism (not shown). The head unit 1 can be moved up and down by driving the second electric motor. On the upper rear side of the head portion 1, an operating body (not shown) for contacting the other end portion of the lever 6 and rotating the lever 6 is mounted.

  FIG. 6 is a perspective view showing the configuration of the regulating wall 19, and FIG. 7 is a front view showing the configuration of the regulating wall 19. The restriction wall 19 is arranged at a position behind the exhaust port 18, over the upper side and the lower side of the exhaust port 18, and up and down over both side walls 1 a, 1 a, and both side walls 1 a, It is molded integrally with 1a. The regulating wall 19 is opposed to the peripheral surface of the upper end portion 3f of the tool holding shaft 3 and the shaft coupling 5 with a distance to the rear side. A substantially rectangular tube-shaped air passage is formed around the upper end 3f. The restriction wall 19 restricts the air around the shaft joint 5 generated by the rotation of the shaft joint 5 from flowing to the rear side of the exhaust port 18 so that the air around the shaft joint 5 flows to the exhaust port 18 quickly. There is. A notch 19 a for preventing interference with the lever 6 is provided at the center in the horizontal direction of the regulating wall 19.

  The tool holding shaft 3 has a cylindrical shape having a small diameter shaft portion 3a on the upper end side and a large diameter shaft portion 3c on the lower end side connected to the small diameter shaft portion 3a via a step portion 3b. A rod 8 having a clamp finger 81 is fitted in the tool holding shaft 3 so as to be movable up and down.

  One inner ring end face of the lower angular ball bearing 2 is in contact with the step portion 3 b of the tool holding shaft 3. A screw portion 3d is provided in a portion disposed in the large-diameter hole portion 13a in the middle of the small-diameter shaft portion 3a. The screw portion 3d is screwed with a screw ring 31 that is in contact with one inner ring end face of the upper angular ball bearing 2. The screw ring 31 and the stepped portion 3b are attached to the inner ring of each of the angular ball bearings 2 and the cylindrical spacers 16 and 16, and apply a preload in the axial direction to the tool holding shaft 3.

  A long hole 32 extending vertically is provided in the upper end portion 3f of the small diameter shaft portion 3a. A connecting pin 33 is inserted into the long hole 32, and the upper end of the rod 8 is connected to the center of the connecting pin 33.

  A holding hole 3e having a truncated cone shape is provided inside the large-diameter shaft 3c, and the tool 10 is inserted into the holding hole 3e from below. The upper end of the tool 10 is clamped by a clamp finger 81.

  The rod 8 in the tool holding shaft 3 has a clamp finger 81 held at the lower end, and the upper end is connected to the central portion of the connecting pin 33 so that it can move up and down. A coil spring 9 is arranged around the rod 8. The coil spring 9 always biases the rod 8 upward. The clamp finger 81 causes the tool 10 to be clamped by the coil spring 9.

  The lever 6 has a substantially square shape, is disposed in the cavity 12, and a central bent portion is pivotally attached to the side walls 1 a and 1 a of the head portion 1 by a pivot. One end of the lever 6 has a bifurcated shape, and the bifurcated portion faces the peripheral surfaces of both ends of the connecting pin 33. The other end of the lever 6 is interlocked with the reciprocating motion of the operating body. One end of the lever 6 is moved downward by the forward movement of the operating body, the bifurcated portion presses the connecting pin 33 to move the rod 8 downward, and the tool 10 is in an unclamped state. One end of the lever 6 is moved upward by the backward movement of the operating body, the rod 8 is moved upward by the biasing force of the coil spring 9, and the tool 10 is clamped.

  FIG. 8 is a perspective view showing the configuration of the cylinder, and FIG. 9 is a front view showing the configuration of the cylinder. The cylindrical body 7 has a bottom, and three outlets 71 penetrating in the radial direction at one place in the circumferential direction are opened apart in the longitudinal direction. One end of the cylinder 7 is fitted into the through hole 17 of the head 1. The cylindrical body 7 is positioned at the rear side of the upper end portion of the bearing cylindrical portion 11, in other words, at a position lower than the upper end portion 3 f of the tool holding shaft 3 protruding upward from the bearing cylindrical portion 11. Arranged so as to be substantially orthogonal to the center, the air outlet 71 is directed obliquely upward (in the direction of the upper end 3f). The total opening area of the air outlet 71 is substantially equal to the cross-sectional area of the hole in the cylinder 7, and the air amount supplied to the hole in the cylinder 7 is reduced from each of the air outlets 71 in the direction of the upper end portion 3 f. put out.

  Of the three air outlets 71, the central air outlet 71 is disposed at a position facing the axis of the tool holding shaft 3, and the other two air outlets 71 have the same diameter as the upper end portion 3 f of the tool holding shaft 3. Are separated by a distance of The cylindrical body 7 is distributed over the upper end portion 3f and blown obliquely upward without concentrating the blown air on the upper end portion 3f.

  One end of the cylindrical body 7 is provided with a flange 72, and a male screw is inserted into an insertion hole 73 formed in the flange 72, and is opened around the through hole 17 in the side wall 1a. The cylinder body 7 is attached to the head portion 1 by being screwed into the screw hole.

  A pipe joint 74 is connected to the open end of the cylindrical body 7 on the flange 72 side. The pipe joint 74 is connected to an air supply pipe connected to a pressurized air source such as a compressor disposed in the factory. The air supply pipe is provided with an on-off valve in the middle, and supplies air to the cylinder body 7 by opening the on-off valve.

  In the machine tool configured as described above, the end portion of the tool 10 is inserted into the lower opening of the tool holding shaft 3, the one end portion of the lever 6 is moved upward by the operating body, and the rod is moved by the coil spring 9. 8, the clamp finger 81 moves upward, and the upper end of the tool 10 is clamped.

  In this state, the electric motor 4 is driven, and the tool holding shaft 3 rotates at high speed via the shaft coupling 5. In addition, the screw shaft is rotated by the driving of the second electric motor, and the head portion 1 is moved up and down integrally with the screw ring that is screwed into the screw shaft so as to be relatively rotatable, and the workpiece is held on the table. The tool 10 is rotated.

  The cylinder 7 is supplied with clean air from a pressurized air source continuously or intermittently, and the upper end is arranged in the cavity 12 of the tool holding shaft 3 from the three outlets 71 of the cylinder 7. Air is blown toward the portion 3f, and the upper end portion 3f and the shaft coupling 5 of the tool holding shaft 3 can be cooled by the blown air. By cooling the upper end portion 3f and the shaft coupling 5, the tool holding shaft 3 Temperature rise can be suppressed. Further, the blowout air blown out from the blowout port 71 and the air around the shaft coupling 5 generated by the rotation of the shaft coupling 5 are restricted by the restriction wall 19 from flowing to the rear side of the exhaust port 18. 18 can be quickly and efficiently exhausted to the outside from the exhaust port 18, and the inside of the cavity 12 can be easily replaced with clean air, so that the temperature inside the head portion 1 is prevented from rising. be able to. Therefore, when the tool holding shaft 3 is continuously rotated at a high speed for a long time, the temperature rise of the tool holding shaft 3 and the shaft coupling 5 can be further effectively suppressed, and the tool holding shaft 3 is continuously rotated at a high speed. By doing so, when the temperature of the angular ball bearing 2 is increased, the heat of the tool holding shaft 3 in which the temperature increase is suppressed is transferred from the lower end to the angular ball bearing 2, and the temperature of the angular ball bearing 2 is increased. Therefore, the deterioration of the lubricating oil applied to the angular ball bearing 2 due to heat can be suppressed, and the service life of the lubricating oil and the durability of the angular ball bearing 2 and the tool holding shaft 3 can be improved. Further, since the temperature rise of the tool holding shaft 3 can be suppressed, it is possible to suppress a decrease in the preload applied to the tool holding shaft 3 by the screw ring 31 and to suppress a decrease in rigidity of the tool holding shaft 3. it can. Further, the flow of air in the cavity 12 that has flowed away from the upper end portion 3f of the tool holding shaft 3 without being regulated by the regulating wall 19 can be moderated, and the occurrence of spraying in the cavity 12 can be eliminated. Can do.

  In the embodiment described above, the angular ball bearing 2 is used as a bearing for supporting the tool holding shaft 3. However, a roller bearing may be used, and the configuration of the bearing is not particularly limited.

  In the embodiment described above, the restriction walls 19 are provided integrally with the both side walls of the head portion 1. In addition, a restriction wall formed separately from the head portion 1 is disposed in the cavity 12. Also good.

DESCRIPTION OF SYMBOLS 1 Head part 12 Cavity 13 Bearing hole 18 Exhaust port 19 Restriction wall 2 Bearing 3 Tool holding shaft 3f Upper end part 4 Electric motor (drive source)
41 drive shaft 5 shaft coupling 7 cylinder (air blowing means)
71 Air outlet

Claims (6)

A bearing is held in a bearing hole that vertically penetrates the lower portion of the head portion having a cavity, and a tool holding shaft is fitted and supported in the bearing, and the upper end portion on the cavity side of the tool holding shaft serves as a drive source. In machine tools that are linked together by shaft couplings,
A machine tool comprising a restriction wall for restricting a flow of air generated by rotation of the shaft joint at a position facing the shaft joint inside the cavity.   The machine tool according to claim 1, wherein an exhaust port is disposed on a side wall of the head portion closer to the shaft coupling than the restriction wall.   The machine tool according to claim 1, wherein the regulation wall is formed between both side walls of the head portion.   The machine tool according to claim 3, wherein the restriction wall is formed integrally with the both side walls. An air blowing means for inserting air into the head part and blowing air from the cylinder toward the upper end;
The cylindrical body is disposed at a position separated from the peripheral surface of the tool holding shaft and at a position intersecting with the axial center of the tool holding shaft, and a blower outlet is provided on the peripheral surface of the hollow side tip portion of the cylindrical body. The machine tool according to claim 2, which is established.   The machine tool according to claim 5, wherein the air outlets are arranged at a plurality of positions separated in the longitudinal direction of the cylindrical body.

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