JP2007015041A - Rotating tool and machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively and efficiently cool a cutting blade, etc. in simple and inexpensive constitution. <P>SOLUTION: This rotating tool 20 is furnished with the cutting blade 22 on a head end and a fixed shaft 32 against a main shaft (tool holder 14) on a rear end respectively. A passage 37 for introduction of compressed gas, a cold air generator 40 to generate cold air from the compressed gas, a discharge port 36 to guide the cold air generated hereby to the cutting blade 22, etc., a passage 26, etc. are provided on this rotating tool 20. The cold air generator 40 has a vortex pipe 42 and is constituted to discharge the cold air while revolving air at high speed in the vortex pipe 42 and generating the cold air at a shaft center part by heat separating work accompanying this revolution by introducing the compressed air to the one end side of this vortex pipe from its tangential direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotary tool suitable for processing FRP (Fiber Reinforced Plastics) and the like, and a machine tool including the rotary tool.

  Conventionally, composite materials (hereinafter referred to as FRP) such as CFRP (carbon fiber reinforced plastic), GFRP (glass fiber reinforced plastic), and AFRP (aramid fiber reinforced plastic) are known as lightweight and high strength materials. It is used in a wide range of fields such as automobiles, railway vehicles and ships.

  For cutting of these FRPs, tools for metal materials such as cemented carbide face mills and cemented carbide end mills having cutting edges made of cemented carbide have been used. However, since FRP processing is more prone to edge wear and shorter tool life than when processing metal materials, in recent years diamond with diamond particles electrodeposited or brazed onto a base metal as a cutting blade Tools with cutting edges are used.

On the other hand, as disclosed in Patent Document 1, as a milling machine, air is supplied to the tool tip through the inside of the main shaft and the arbor so that chips can be removed, the cutting blade can be lubricated, and cooled by processing. What has been proposed.
Japanese Patent Laid-Open No. 2005-22063

  FRP machining with a milling tool equipped with a diamond cutting edge is close to grinding due to the structure of the cutting edge, and has a lower machining efficiency than the original cutting. Therefore, in order to achieve high machining efficiency, it is required to set the rotation speed and feed speed of the tool high.

  However, when the rotational speed of the tool is set high, the cutting blade and the part to be processed become high temperature due to the cutting heat generated thereby, causing the following problems. That is, when the temperature exceeds 600 ° C., the wear resistance rapidly decreases, the wear of the diamond particles tends to progress, and the FRP epoxy resin or the like is seized between the diamond particles, which easily causes clogging. As a result, the cutting ability of the cutting blade is significantly reduced. For this reason, it is difficult to perform high-speed cutting, and it has been difficult to sufficiently increase the processing efficiency.

  In view of this, it is considered to avoid the above-described reduction in cutting ability by supplying air (compressed air) to the tip of the tool and cooling the cutting blade or the like as in Patent Document 1. However, when high-speed machining is performed, the cutting edge and the part to be cut become high temperature, so that it is possible to prevent a decrease in cutting ability only by supplying air at normal temperature (working environment temperature) to the tool tip as in Patent Document 1. It is difficult to obtain a cooling effect. On the other hand, it may be possible to cool the air to a temperature lower than room temperature using a refrigerant and then supply it to the tool tip. In this case, however, additional equipment for circulating the refrigerant is required, increasing the size and cost of the device. And the maintenance burden increases. In addition, since air is supplied through the inside of the main shaft or the like, the heat loss of cold heat is also large.

  The present invention has been made in view of the above circumstances, and an object thereof is to effectively and efficiently cool a cutting blade or the like with a simple and inexpensive configuration.

  In view of the above circumstances, the rotary tool of the present invention includes a plurality of cutting blades arranged in the circumferential direction on the front end surface, and has a tool body provided with a fixing portion with respect to the main shaft at the rear end, through the fixing portion. A rotary tool that is rotationally driven integrally with the main shaft by being mounted on the main shaft of a machine tool, and includes an introduction portion for introducing compressed gas from the outside into the tool body, and an axial center of the tool body The cylindrical portion is located in the cylindrical portion, and the compressed gas is introduced from one of the tangential directions to one end side of the cylindrical portion in the axial direction so that the gas is moved in the axial direction while rotating at high speed along the inner peripheral surface of the cylindrical portion. And cold air generating means for generating and discharging cool air having a temperature lower than the introduction temperature in the axial center portion of the cylindrical portion by the heat separation action accompanying this high-speed swirling, and the cold air generated by the cold air generating means I'll cool the cutting blade Those that are configured to (claim 1).

  According to this rotary tool, when compressed gas is supplied into the tool body from the outside, cold air having a temperature lower than that of the compressed gas is generated in the cold air generating means, and this is supplied to the tool tip to cool the cutting edge and the work portion of the workpiece. Will be performed. On the other hand, when the gas is swirled at high speed inside the cylindrical portion, the cold air generating means gathers high-energy hot gas molecules near the inner peripheral surface of the cylindrical portion, while low-energy cold gas molecules gather at the axial center portion of the cylindrical portion. Since cold air having a temperature lower than that of the compressed gas is generated by utilizing the heat separation action of gathering, it is possible to generate cold air without using power or a refrigerant.

  In this rotary tool, the tool body includes a tool body provided with the cutting blade, and a tool assembly including the fixing portion and the tool body is detachably assembled. It is preferable that the cold air generating means is incorporated in the appendage (claim 2).

  That is, the entire tool body may have an integrated configuration. However, according to the above configuration, for example, when the cutting blade is worn or damaged, the tool body is attached to the tool assembly. Since it is possible to continuously use the cold air generating means simply by replacing the, it becomes a rational configuration.

  In addition, about the rotary tool with which the main axis | shaft of a machine tool is equipped with the supply part of compressed gas, the introduction part for introduce | transducing compressed gas is provided in the said fixed part, and the mounting state to the said main axis | shaft The introduction part may be configured to be connected to the supply part (Claim 3).

  That is, recently, since a machine tool (for example, Patent Document 1 of the prior art) in which compressed air is supplied to the tool tip via the main spindle has appeared, the compressed gas is applied to the fixed portion of the tool body as described above. If the introduction portion is provided, it is possible to generate the cold air by introducing the compressed gas into the tool body using the configuration of the machine tool as it is.

  The configuration of the rotary tool as described above is particularly useful when the cutting blade is provided with a diamond cutting blade having diamond particles supported on a base metal (claim 4).

  That is, when processing FRP, a tool having a diamond cutting edge is often applied as a cutting edge. It is difficult to maintain the cutting performance of diamond cutting blades at high temperatures, such as a decrease in wear resistance due to temperature rise due to processing. Therefore, the configuration of the rotary tool that can effectively cool the cutting edge or the like is particularly useful for a tool having a diamond cutting edge.

  On the other hand, a machine tool of the present invention includes a main shaft that is rotationally driven, a rotary tool that is detachably fixed to the main shaft, and a table that supports a workpiece to be movable relative to the main shaft. In a machine tool, the rotary tool according to any one of claims 1 to 4 is detachably fixed to the main shaft as a rotary tool, and gas that supplies compressed gas to the rotary tool via the introduction portion. Supply means is provided (claim 5).

  According to this machine tool, while the workpiece is processed by driving the rotary tool, compressed gas is supplied to the rotary tool by the gas supply means while the workpiece is processed, and the cold air generating means incorporated in the rotary tool is used. Cold air is generated. As a result, the cutting edge or the workpiece portion of the workpiece is cooled.

  The rotary tool has a compressed gas introduction part in the fixed part of the tool body, and a compressed gas supply part that can be connected to the introduction part in a state where the rotary tool is mounted on the spindle. It is preferable that the gas supply means is configured to supply compressed gas to the rotary tool through the supply unit (Claim 6).

  According to this configuration, it is possible to generate cold air while supplying compressed gas to the rotary tool through the main shaft.

  According to the rotary tool and the machine tool of the present invention, the cutting blade or the part to be processed can be effectively cooled using cool air lower than the working environment temperature (normal temperature). In addition, since the cold air is generated without using a refrigerant, there is no need to provide a refrigerant or a circulation facility thereof, and therefore the cutting blade can be cooled with a simple and inexpensive configuration. In addition, since the cool air itself is generated by the rotary tool provided with the cutting edge, the cooling air can be given to the cutting edge with almost no loss of cold. Therefore, the cutting blade and the like can be cooled effectively and efficiently.

  A preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows a vertical milling machine which is a machine tool according to the present invention (a machine tool to which a rotary tool according to the present invention is applied).

  As shown in the figure, a column 2 is erected on a base 1 of a milling machine, and a knee 3 is provided so as to be movable up and down with respect to the column 2, and a workpiece is fixed to the knee 3. The table 4 is provided so as to be movable in the left-right direction. A ram base 6 is attached to the upper portion of the column 2, and a ram 7 is supported on the ram base 6 so as to be movable in the front-rear direction (a direction perpendicular to the paper surface in FIG. 1). A head 10 mounted with a main shaft 12 that can rotate around a vertical axis and a motor that drives the main shaft 12 is attached to the front surface of the ram 7. A rotary tool 20 is connected to the main shaft 12 via a tool holder 14. It is attached to.

  The knee 3, the table 4 and the ram 7 can be manually fed by a handle operation not shown in the figure, or can be automatically fed by a motor, and the workpiece fixed on the table 4 and the rotary tool 20 by feeding the knee 3 or the like. The workpiece is configured to perform desired processing while relatively moving the workpiece.

  In the figure, reference numeral 9 denotes a compressor attached to the milling machine. While the workpiece is being processed, compressed air is generated by the compressor 9 and is supplied to the head 10 via an air filter (not shown). The main shaft 12 is supplied.

  FIG. 2 schematically shows the rotary tool 20 (rotary tool according to the present invention) in a sectional view.

  This rotary tool 20 is a front milling machine for processing FRP such as CFRP (carbon fiber reinforced plastic), and has a cylindrical tool body as shown in FIG. In the drawing, a plurality of cutting blades 22 are arranged in the circumferential direction on the lower end surface.

  A fixed shaft 32 (corresponding to a fixed portion according to the present invention) is connected to the rear end of the tool body, and the fixed tool 32 is held by the tool holder 14 so that the rotary tool 20 faces downward. In other words, the cutting blade 22 is mounted on the spindle 12 in a posture oriented toward the table 4 side.

  The rotary tool 20 includes a front end side tool body 21a having a cutting edge 22 and a rear end side tool assembly 21b having the fixed shaft 32. The tool body 21a is attached to and detached from the tool assembly 21b. It has a combined structure.

  Specifically, as shown in FIG. 4, an assembling recess 24 is formed on the rear end surface (the end surface opposite to the cutting edge 22) of the tool main body 21a, while the front end surface of the tool assembly 21b ( An assembly convex part 34 is formed on the end surface opposite to the fixed shaft 32, and the tool is attached to the tip of the tool assembly 21 b with the assembly convex part 34 fitted in the assembly concave part 24. The main body 21a is assembled, and in this state, a bolt 29 is inserted into the tool main body 21a from the tool front end side and screwed to the tool assembly 21b. Therefore, by loosening the bolt 29, both members can be easily separated and only the tool body 21a can be removed. The tool main body 21a and the tool assembly 21b are configured such that the key 35 fixed to the assembly convex portion 34 is interposed in the key groove 24a formed on the inner peripheral surface of the assembly concave portion 24. They are keyed together.

  As shown in FIG. 3, a plurality of cutting blades 22 are provided on the front end surface of the rotary tool 20 in a circumferential direction around the central axis. In the illustrated example, eight cutting blades 22 are provided. It has been.

  These cutting blades 22 are configured by electrodepositing diamond particles on a flat cutting blade projection (base metal) protruding from the tip surface of the tool body 21a. The particle is fixed to the convex part for the cutting edge by electroplating of nickel.

  Each cutting edge 22 is formed in a substantially triangular shape in plan view. Grooves are formed by the side walls of the cutting blades 22 between the adjacent cutting blades 22 in the circumferential direction. These grooves are formed in a spiral shape from the center of rotation as shown in the figure, and during processing, the machining waste is smoothly discharged to the outside by centrifugal force as the rotary tool 20 rotates. Yes. In FIG. 3, white arrows indicate the rotation direction of the rotary tool 20 during processing.

  The rotary tool 20 is provided with a plurality of passages 26 that allow the assembly recess 24 to communicate with the outside of the tip of the tool body 21a. These passages 26 are for guiding the cool air generated by the cool air generator 40, which will be described later, to the front end surface of the rotary tool 20, one at the center of the rotary tool 20 and eight in the circumferential direction. Are arranged in line. As shown in FIG. 3, the ends of the respective passages 26 arranged in the circumferential direction are on the rotation center side with respect to the cutting blades 22 and open in the vicinity of the apex portions of the respective cutting blades 22.

  The rotary tool 20 is further provided with a plurality of heat radiating fins 28 on its outer peripheral surface, and these fins 28 are arranged in parallel in the axial direction at equal intervals.

  On the other hand, a cold air generator 40 (corresponding to the cold air generating means according to the present invention) is incorporated in the tool assembly 21b.

  The cold air generator 40 generates cold air without using any refrigerant by introducing compressed air. More specifically, the cold air generator 40 has a vortex tube 42 (corresponding to the cylindrical portion according to the present invention) disposed on the axis of the rotary tool 20 as shown in FIG. The front end (lower end in FIG. 2) of the vortex tube 42 is provided with a cold air discharge port 44a formed at a diameter smaller than that of the vortex tube 42 at the axial center, and the opening is adjusted by a valve 47 at the rear end. A possible warm air discharge port 44b is provided. Further, a port 46 provided in a tangential direction with respect to the vortex tube 42 is provided immediately behind the discharge port 44a in the vortex tube 42, and the compressed air guided through the introduction passage 37 to be described later is supplied to this port. It is introduced into the vortex tube 42 through 46. That is, when compressed air is introduced into the vortex tube 42 from the tangential direction via the port 46, the compressed air moves from the front end side toward the other end side while rotating at high speed along the inner peripheral surface of the vortex tube 42. With this high-speed rotation, high energy hot gas molecules gather near the wall peripheral surface of the vortex tube 42, while low energy cold gas molecules gather at the axial center of the vortex tube 42. Of the compressed air that has moved to the rear end of the vortex tube 42, the warm air in the vicinity of the wall peripheral surface is exhausted to the outside through the discharge port 44b. As a result, the cool air is discharged from the discharge port 44a at the tip of the vortex tube.

  The cold air generator 40 has a maximum of about 40 ° C. lower than the inlet temperature to the vortex tube 42 (introduction temperature to the port 46 described later) by setting conditions such as the pressure and flow rate of compressed air and the opening degree of the valve 47. In this embodiment, the pressure of the compressed air, the flow rate, and the opening of the valve 47 are set so as to generate cool air that is lower by about 10 ° C. than the working environment temperature (normal temperature). Yes.

  The discharge port 44a of the cold air generator 40 communicates with the concave portion 34a formed at the tip of the convex portion 34 through the discharge hole 36 formed in the assembling convex portion 34, whereby the cold air generator 40 The generated cold air is introduced into each passage 26 of the tool body 21a through the discharge hole 36 and the recess 34a.

  The tool assembly 21b is further provided with an introduction passage 37 and a warm air discharge hole 38.

  The introduction passage 37 is a passage for supplying compressed air for generating cold air to the cold air generator 40. As shown in FIG. 2, the introduction passage 37 is connected to the end face of the fixed shaft 32 (compressed gas according to the present invention). And is provided so as to guide the compressed air introduced from the introduction port to the port 46 of the cold air generator 40 (indicated by a broken line arrow in FIG. 2).

  Although not shown in detail, the tool holder 14 is provided with a passage 14 a that communicates with the introduction passage 37, and the spindle 12 is provided with a passage (not shown) that communicates with the passage 14 a of the tool holder 14. It has been. The compressor 9 is connected to the passage of the main shaft 12 through various valves, air filters, etc., so that the compressed air generated by the compressor 9 is rotated via the main shaft 12 and the tool holder 14. (Cold air generator 40) is supplied.

  On the other hand, the warm air discharge hole 38 is for releasing the warm air generated by the cool air generator 40 to the outside, and a portion corresponding to the vortex tube 42 (mainly the vortex tube 42 of the vortex tube 42). The rear part) is provided so as to communicate with the outside of the tool assembly 21b. That is, in the cool air generator 40, warm air is generated as a by-product of cold air generation as described above, but this warm air is discharged from the discharge port 44b provided at the rear end of the vortex tube 42 and further rotated through the warm air discharge hole 38. It is discharged to the outside of the tool 20.

  When a workpiece (FRP material) is machined by the above machine tool, the spindle 12 is driven to rotate the rotary tool 20 integrally therewith and cut and feed it to the workpiece. On the other hand, the compressor 9 is operated, whereby compressed air is supplied to the rotary tool 20 via the main shaft 12 and the tool holder 14. When compressed air is supplied to the rotary tool 20 in this way, cold air is generated by the cold air generator 40 built in the rotary tool 20 based on the compressed air, and this cold air is discharged into the discharge hole 36, the recess 34a and the passage. 26, it is guided to the front end surface of the rotary tool 20 through 26, and is supplied to each cutting edge 22 and a part to be processed of the workpiece (shown by a one-dot chain line in FIGS. 2 and 3). That is, the cutting blades 22 and the like are cooled by this cold air, and as a result, the temperature rise of each cutting blade 22 and the part to be processed accompanying the processing is suppressed.

  According to the machine tool as described above, in order to supply cold air having a temperature lower than the working environment temperature (normal temperature) to the cutting blade 22 or a part to be processed during machining of the workpiece, conventional air is simply supplied to the cutting blade. Compared with the apparatus, a high cooling effect can be obtained, and the temperature rise of each cutting edge 22 and the like accompanying processing can be effectively suppressed. In particular, in the rotary tool 20 that processes the FRP material with the diamond cutting blade (cutting blade 22) on which diamond particles are to be electrodeposited, the wear resistance is remarkably lowered when the temperature of the cutting blade 22 rises excessively, and the workpiece is processed. As a result of the seizure or clogging of the epoxy resin that constitutes the FRP material to the cutting edge 22 easily due to the temperature rise of the portion, it is considered that the cutting ability of the cutting edge 22 is remarkably reduced or in some cases impossible to cut. However, according to the apparatus of the above embodiment, such a situation can be effectively prevented. Further, by supplying cold air to the cutting blade 22 or the part to be processed, the chip removal effect is effectively exhibited.

  Therefore, while processing the FRP material while rotationally driving the rotary tool 20 at high speed, it becomes possible to effectively prevent the temperature rise of the cutting edge 22 due to such high speed processing. As a result, the diamond cutting edge Processing of the FRP material by the rotary tool 20 provided with the (cutting edge 22) can be performed at higher speed and smoothly.

  In addition, since the cool air is generated using the cool air generator 40 that generates cool air without using any refrigerant, the above-described effects can be obtained with a simple and inexpensive configuration.

  For example, a coolant circulation facility is provided on the main body side of the machine tool, and heat is exchanged between the coolant and air using a heat exchanger, so that cold air is generated and supplied to the rotary tool 20. In this case, however, it is necessary to separately provide a refrigerant, its circulation facility, etc. on the machine tool main body side, which inevitably increases the burden of maintenance as well as the complexity and cost of the apparatus. On the other hand, according to the configuration of the above-described embodiment, the cool air generator 40 is incorporated into the rotary tool 20 and the compressed air is simply supplied to the rotary tool 20. Therefore, the configuration is simple and inexpensive, and the maintenance burden is increased. The above-described effects can be obtained without causing them.

  In addition, since the cool air generator 40 is incorporated in the rotary tool 20 itself, the generated cool air can be immediately supplied to the cutting blade 22, and the heat loss of cold heat can be minimized. Therefore, compared with the structure which guides the air cooled using the refrigerant from the main body side of the machine tool to the rotary tool 20, it is possible to efficiently cool the cutting blade 22 and the like while suppressing the heat loss of the cold.

  By the way, the machine tool as described above and the rotary tool 20 applied thereto are one of preferred embodiments of the machine tool and the rotary tool according to the present invention, and the specific configuration thereof is the gist of the present invention. Changes can be made as appropriate without departing from the scope.

  (1) For example, in the embodiment, the cool air generator 40 is provided as the cool air generating means according to the present invention, and this is housed in the tool assembly 21b, but the tool assembly 21b itself is the cold air generating means. You may comprise. That is, instead of providing the cold air generator 40, a space corresponding to the vortex tube 42 may be formed in the tool assembly 21b itself, and compressed air may be introduced into this space to generate cold air. According to this configuration, it is possible to reduce the weight of the rotary tool 20 compared to the configuration of the above-described embodiment in which the separate cool air generator 40 is accommodated in the tool assembly 21b.

  (2) In the embodiment, the rotary tool 20 provided with a diamond cutting blade on which diamond particles are to be electrodeposited has been described as the cutting blade 22. However, the type of the cutting blade 22 is not limited to the diamond cutting blade but is general. A cutting blade made of a cemented carbide may be used.

  (3) In the rotary tool 20 of the embodiment, the tool body 21a is configured to be detachable from the tool assembly 21b including the cool air generator 40. For example, the tool body 21a and the tool assembly 21b are configured. The cutting blade 22 may be provided by an attached blade or a transplanting blade.

  (4) The number and opening positions of the passages 26 for guiding the cold air to the cutting blade 22 are not limited to the embodiment, and the cutting blade 22 is effective depending on the specific shape and arrangement of the cutting blade 22. It may be provided so that it can be cooled. In the example of the embodiment, a spiral groove is formed between the adjacent cutting edges 22 in the circumferential direction, and the opening position of the passage 26 is in the vicinity of the acute angle portion on the rotation center side of each cutting edge 22. As a result, the cool air discharged from the passage 26 is smoothly discharged to the outside in the rotational radial direction through the grooves while cooling the cutting blades 22 as shown by a one-dot chain line in FIG. Therefore, there is an effect that the cutting scraps 22 can be effectively discharged to the outside while the cutting blade 22 is effectively cooled.

  (5) Although the cold air generator 40 is provided in the rotary tool 20 in the embodiment, the cold air generator 40 may be provided in the tool holder 14. That is, the rotary tool 20 is provided with only the passage 26 for guiding the cool air to the cutting edge 22, and the tool holder 14 is provided with a configuration corresponding to the cold air generator 40, the introduction passage 37, the warm air discharge hole 38, and the like. Alternatively, compressed air may be introduced into the tool holder 14 via the main shaft 12 and supplied to the rotary tool 20 while generating cool air with the tool holder 14. In this case, the tool holder 14 constitutes the tool assembly according to the present invention, and the rotary tool 20 constitutes the tool main body according to the present invention.

  (6) In the embodiment, the invention relating to the rotary tool of the present invention is applied to a face mill, but it can also be applied to, for example, an end mill, a boring cutter, or the like.

1 is a schematic front view showing a milling machine that is a machine tool according to the present invention (a machine tool to which a rotary tool according to the present invention is applied). It is a longitudinal cross-sectional view which shows a rotary tool. It is A arrow line view of FIG. 2 which shows the structure of a tool main body. It is a longitudinal cross-sectional view of the rotary tool which shows the state (state which removed the tool main body) of the rotary tool.

Explanation of symbols

12 Spindle 14 Tool holder 20 Rotating tool 21a Tool body 21b Tool assembly 22 Cutting blade 40 Cold air generator

Claims (6)

The spindle includes a plurality of cutting blades arranged circumferentially on the front end surface, and a tool body having a fixing portion for the main shaft at the rear end, and is attached to the main shaft of the machine tool via the fixing portion. A rotary tool that is driven to rotate together with
The tool body has an introduction portion for introducing compressed gas from the outside, and a cylindrical portion located on the axial center of the tool body, and the compressed gas is introduced from one tangential direction to one axial end side of the cylindrical portion. By introducing the gas, the gas is moved in the axial direction while rotating at high speed along the inner peripheral surface of the cylindrical portion, and cold air having a temperature lower than the introduction temperature is applied to the axial center portion of the cylindrical portion by the heat separation action accompanying the high-speed rotation. A rotating tool characterized by comprising cold air generating means for generating and discharging, and configured to cool the cutting blade with the cold air generated by the cold air generating means. The rotary tool according to claim 1, wherein
The tool body is composed of a tool body provided with the cutting blade, and a tool assembly including the fixing portion and removably assembled to the tool body, and the cold air generating means is attached to the tool assembly. A rotary tool characterized in that is incorporated. The rotary tool according to claim 1 or 2,
A rotary tool to be mounted on the main shaft provided with a compressed gas supply unit,
A rotary tool, wherein an introduction part for introducing compressed gas is provided in the fixed part, and the introduction part is connected to the supply part in a state of being mounted on the main shaft. The rotary tool according to any one of claims 1 to 3,
The rotary tool, wherein the cutting blade is a diamond cutting blade having diamond particles supported on a base metal. In a machine tool comprising a main shaft that is rotationally driven, a rotary tool that is detachably fixed to the main shaft, and a table that supports a workpiece to be movable relative to the main shaft.
The rotary tool according to any one of claims 1 to 4 is detachably fixed to the main shaft as a rotary tool, and further includes gas supply means for supplying compressed gas to the rotary tool via the introduction portion. A machine tool characterized by The machine tool according to claim 7,
The rotary tool has a compressed gas introduction part in the fixed part of the tool body, and the main shaft is provided with a compressed gas supply part connectable to the introduction part in a state where the rotary tool is mounted. The gas supply means is configured to supply compressed gas to the rotary tool through the supply unit.

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