JP2019115967A - Tool holder - Google Patents

Abstract

To provide a tool holder which enables improvement of the quality of oil mist supplied to a tool.SOLUTION: A tool holder 10 includes a first air flow passage 36 and a second air flow passage 37 in which air sent from a spindle 82 is branched and flows. The first air flow passage 36 and the second air flow passage 37 are respectively provided with regulators 41, 38. The tool holder 10 includes: a storage chamber 55 which stores oil; a compression chamber 61 which is connected to the downstream side of the first air flow passage 36 and applies pressure to the oil in the storage chamber 55; and an oil passage 64 in which the oil sent from the storage chamber 55 flows. The tool holder 10 includes a nozzle 43 which mixes the oil supplied through the oil passage 64 with air supplied through the second air flow passage 37 to generate oil mist and supplies the oil mist to a tool T.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a tool holder.

  In general, a machine tool processes a workpiece while supplying a large amount of oil as a cutting fluid to a processing unit for cooling, lubrication, swarf removal, etc. of a workpiece or a tool. Therefore, there are problems such as large consumption of oil, environmental pollution due to scattering of oil, and disposal processing of used oil. Therefore, in recent years, semi-dry processing has been proposed in which a workpiece is processed while supplying an oil mist generated by mixing oil and high pressure air to a processing unit. In semi-dry processing, the use of oil mist can substantially reduce the amount of oil substantially used.

  However, when the oil mist is released from the inside of the main shaft through the tool fixed to the tool holder, the oil adheres to the inner wall of the passage inside the main shaft, and the oil content in the oil mist actually released decreases. Had the problem of

  In order to solve this problem, an apparatus has been proposed which supplies oil stored in an oil tank in a tool holder to a fluid passage in the vicinity of a tool and mixes it with high pressure air to generate oil mist (Patent Document 1 See Figure 8 in 1).

Unexamined-Japanese-Patent No. 2000-210836

  However, in the device described in Patent Document 1 described above, high-pressure air is introduced into the tank placement portion in the tool holder, applies pressure to the piston of the oil tank, and reaches the venturi portion via the air flow path. That is, the pressure of the air for pressing and injecting the oil and the pressure of the air for mixing are uniformly determined by the pressure of the high pressure air from the air source, and both can not be adjusted individually. For this reason, an appropriate pressure can not be obtained, and there is a possibility that the quality such as the injection speed of the oil mist supplied to the tool and the oil content rate can not be maintained well.

  An object of the present invention is to provide a tool holder capable of improving the quality of oil mist supplied to a tool.

  In order to solve the above-mentioned subject, the tool holder concerning the present invention is provided with the fixed part which fixes a tool, and the main part provided in the end face side of the fixed part, and equipped with the tip part of a spindle. Here, the tool holder includes a first air flow path and a second air flow path which branch and flow the air sent from the main shaft. Pressure adjusting means is provided in at least one of the first air flow passage and the second air flow passage. Further, the tool holder is connected from a storage chamber for storing oil, a pressurizing chamber connected to the downstream side of the first air flow path, and applying pressure to oil in the storage chamber, and sent from the storage chamber And an oil flow path for flowing oil. The tool holder mixes an oil supplied through the oil flow path with air supplied through the second air flow path to generate an oil mist and supply the oil mist generator to the tool. Prepare.

  ADVANTAGE OF THE INVENTION According to this invention, the tool holder which can improve the quality of the oil mist supplied to a tool can be provided.

It is a sectional view showing the composition of the spindle device with which the tool holder concerning one embodiment of the present invention was attached. It is a right side view of the tool holder which showed the oil tank of the tool holder shown by FIG. 1 in the cross section. It is a front view of the tool holder shown by FIG. It is a left side view of the tool holder which showed the oil tank of the tool holder shown by FIG. 1 in the cross section. It is sectional drawing in alignment with the VV line | wire of FIG. It is sectional drawing in alignment with the VI-VI line of FIG. It is sectional drawing in alignment with the VII-VII line of FIG. It is a sectional view showing typically an air channel and an oil channel in a tool holder. (A) is a cross-sectional view taken along line IX-IX in FIG. 7 with the oil flow path opened, and (b) is a cross-sectional view taken along line IX-IX in FIG. 7 with the oil flow path closed.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in each figure, about the same component and the same component, the same code | symbol is attached | subjected and those duplicate description is abbreviate | omitted suitably.

  FIG. 1 is a cross-sectional view showing the configuration of a spindle device 80 on which a tool holder 10 according to an embodiment of the present invention is mounted. Hereinafter, for convenience of explanation, the side to which the tool T is attached may be referred to as the “tip” side or the “front” side, and the opposite side may be referred to as the “base end” side or the “rear” side.

  As shown in FIG. 1, a spindle device 80 of a machine tool includes a cylinder 81 having a cylindrical shape, and a spindle 82 rotatably supported by bearings 83 and 84 inside the cylinder 81. The main shaft 82 is rotated by a built-in motor 85 having a rotor 85a and a stator 85b. A tool holder 10 having a tool T fixed thereto is removably mounted on the tip end of the spindle 82.

  In the inside of the main shaft 82, an axial hole 82a penetrating on the central axis is formed. A tapered hole 82b having a shape complementary to that of the tapered shank portion 34 of the tool holder 10 is formed at the tip (left side in FIG. 1) of the axial hole 82a.

  The main shaft 82 has a pull rod 87 inserted therein. The distal end portion of the pull rod 87 is configured to be able to be locked via a steel ball 88 with respect to the pull stud 33 provided at the proximal end portion of the tool holder 10. A bracket 89 is fixed to the proximal end of the pull rod 87. A disc spring 90 is mounted between the metal fitting 89 and a locking step 82c formed on the inner peripheral surface of the shaft hole 82a of the main shaft 82 via a retainer member 91 and the like.

  When the pull rod 87 is moved to the right in FIG. 1 by the elastic force of the disc spring 90, the pull stud 33 is pulled in by the steel ball 88, and the shank 34 of the tool holder 10 is pressed against the tapered hole 82b of the main shaft 82. It is held. On the other hand, when the metal fitting 89 is pushed forward against the elastic force of the disc spring 90, the holding of the pull stud 33 of the tool holder 10 by the tip of the pull rod 87 and the steel ball 88 is released. Then, an exchanging operation of the tool T and the tool holder 10 is performed by an automatic tool changing device (not shown).

  A passage 87 a is formed on the central axis of the pull rod 87. The proximal end side of the passage 87 a is connected to the air supply device 93 via the supply pipe 92. The supply pipe 92 is provided with an on-off valve 94. By opening the on-off valve 94, high pressure air (hereinafter, also simply referred to as "air") is supplied from the air supply device 93 through the supply pipe 92 to the inside of the tool holder 10.

  FIG. 2 is a right side view of the tool holder 10 showing the oil tank 50 of the tool holder 10 shown in FIG. 1 in cross section. That is, in FIG. 2, the oil tank 50 is shown in cross section, and the other part of the tool holder 10 is shown as viewed from the right side. FIG. 3 is a front view of the tool holder 10 shown in FIG.

  As shown in FIG. 2 and FIG. 3, the tool holder 10 is provided at the fixing portion 20 for fixing the tool T, and at the base end side of the fixing portion 20, and is a main body mounted at the tip of the main shaft 82 (see FIG. And a unit 30. Moreover, the tool holder 10 is equipped with the oil tank 50 which has the storage chamber 55 which stores oil.

  The fixing portion 20 is attached to the front end surface of the main body portion 30 by a bolt 21. The tool T (see FIG. 7) is fixed to the fixing portion 20 of the tool holder 10 by tightening the screw member 86 (see FIG. 7) from the side. That is, although the fixing method of the tool T by the tool holder 10 is a side lock method here, it is not limited to this, For example, other fixing methods, such as a collet chuck method, may be used.

  The main body portion 30 includes a mounting portion 31 positioned on the main shaft 82 (see FIG. 1) side, and a support portion 32 provided on the front side of the mounting portion 31. The mounting portion 31 has a shank portion 34 having a tapered outer peripheral surface 34 a which can be in close contact with the tapered hole 82 b (see FIG. 1) of the main shaft 82. A pull stud 33 is attached to the proximal end side of the shank portion 34 by screw fastening. On the front side of the shank portion 34, a gripped portion 35 which can be gripped by an automatic tool changer (not shown) is continuously provided. A passage 30 a is formed on the central axis of the mounting portion 31 over the pull stud 33, the shank portion 34 and the gripped portion 35.

  The support portion 32 is integrally formed with the mounting portion 31. In the support portion 32, the first air flow path 36 and the second air flow path for branching and flowing the air sent from the passage 87a in the pull rod 87 of the main shaft 82 (see FIG. 1) through the passage 30a in the mounting portion 31 37 are formed.

  The second air passage 37 has a passage 37a communicating with the passage 30a and extending radially in the support portion 32, and a passage 37b communicating with the passage 37a and extending axially in the support portion 32. . Further, the second air flow path 37 has a tube 37c made of, for example, a resin and communicated with the passage 37b, and a joint 39 connected and communicated with the tube 37c. A regulator 38 is provided between the passage 37 b of the second air flow passage 37 and the tube 37 c. The regulator 38 is provided with an adjusting hexagonal socket head 38 a as an adjusting unit for adjusting the set pressure value of the regulator 38.

  The oil tank 50 includes a cylindrical inner case 51 disposed radially outward of the support portion 32 of the main body 30, and a cylindrical outer case 52 disposed radially outward of the inner case 51. There is. An annular space 53 is formed between the inner case 51 and the outer case 52, and an annular piston 54 is accommodated in the space 53. The rear side of the piston 54 in the space 53 functions as a storage chamber 55 for storing oil. That is, the storage chamber 55 is disposed radially outward of the main body portion 30, and the storage chamber 55 has an annular space surrounding the main body portion 30.

  On the outer peripheral surface of the oil tank 50, an injection port 56 for injecting oil toward the storage chamber 55 is provided. The injection port 56 is provided with an oil receiving mechanism 57 having a valve that is normally closed and opened at the time of oil injection. However, a closure plug (not shown) may be removably attached to the injection port 56 so that the oil is injected toward the storage chamber 55 after the closure plug is removed at the time of oil injection. The oil tank 50 is fixed to the main body 30 by a bolt 58. At the front end face of the oil tank 50, a weight 59 for adjusting the rotational balance is fixed by a bolt 60, as required.

  The front side of the piston 54 in the space 53 functions as a pressure chamber 61 that applies pressure to the oil in the storage chamber 55. The pressure chamber 61 is in communication with the joint 63 via the passage 62.

  FIG. 4 is a left side view of the tool holder 10 showing the oil tank 50 of the tool holder 10 shown in FIG. 1 in cross section. That is, in FIG. 4, the oil tank 50 is shown in cross section, and the other part of the tool holder 10 is shown as viewed from the left side.

  As shown in FIG. 4, the first air flow passage 36 communicates with the passage 30 a and extends radially in the support 32, and the passage extending axially in the support 32 in communication with the passage 36 a. And 36b. Further, the first air flow path 36 has, for example, a resin tube 36c in communication with the passage 36b, and a joint 40 connected to the tube 36c for communication. A regulator 41 is provided between the passage 36 b of the first air flow passage 36 and the tube 36 c. The regulator 41 is provided with an adjustment hexagonal socket head 41 a as an adjustment unit for adjusting the set pressure value of the regulator 41. Here, the regulator 41 corresponds to a first pressure adjusting means provided in the first air flow passage 36, and the regulator 38 corresponds to a second pressure adjusting means provided in the second air flow passage 37. ing.

  As shown in FIGS. 2 and 4, the support portion 32 of the main body portion 30 has a pair of large diameter portions 32 a and 32 b which are formed to be separated in the front and rear direction. Further, between the pair of large diameter portions 32a and 32b, a cylindrical trunk portion 32c having an outer diameter smaller than that of the pair of large diameter portions 32a and 32b is formed.

FIG. 5 is a cross-sectional view taken along the line V-V of FIG.
As shown in FIG. 5, a pair of parallel flat surfaces 32d and 32e are formed on the outer periphery of the body 32c with the central axis of the body 32c interposed therebetween. The distance between the pair of flat surfaces 32d and 32e is set smaller than the maximum outside diameter of the body 32c. That is, in the pair of flat surfaces 32d and 32e, a pair of portions on opposite sides (left and right in FIG. 5) in the outer periphery of the body 32c are respectively retracted inward in the radial direction than the maximum outer diameter of the body 32c. It is formed. The regulator 38 and the regulator 41 are disposed on the radially outer side of each of the pair of flat surfaces 32 d and 32 e. The regulator 38 and the regulator 41 are here identical parts, ie identical structures.

  The regulator 38 and the regulator 41 are disposed at opposite positions across the central axis of the main body 30. Further, in the present embodiment, particularly, the regulator 41 is disposed so as to overlap with the other when assuming that one of the regulator 38 and the regulator 41 is rotated 180 degrees around the central axis of the main body 30. That is, viewed from the direction of the central axis of the main body 30, the regulator 38 and the regulator 41 are in a point-symmetrical relationship.

  The injection port 56 of the oil tank 50 communicates with the inside of the storage chamber 55 (see FIG. 2) through the oil receiving mechanism 57 and the oil injection passage 42. The oil injection passage 42 communicates with the injection port 56 and extends radially, the injection passage 42b communicating with the injection passage 42a and extending substantially radially and communicating with the injection passage 42a, and extends axially and communicates with the injection passage 42b. And an injection channel 42c. The injection passage 42 c communicates with the interior of the storage chamber 55.

6 is a cross-sectional view taken along the line VI-VI of FIG.
As shown in FIG. 6, the joint 39 is L-shaped, one end of which is connected to the tube 37c, and the other end of which is connected to the air inlet 43a of the nozzle 43 as an oil mist generator. The joint 40 is disposed in a recess 32f formed in the body 32c of the support portion 32, one end thereof is connected to the tube 36c, and the other end is in communication with the passage 44 formed in the support portion 32. ing.

7 is a cross-sectional view taken along the line VII-VII in FIG.
As shown in FIG. 7, the passage 44 is in communication with the passage 62 through the joint 63. The passage 44, the joint 63 and the passage 62 are components of the first air passage 36. The passage 62 is in communication with the pressure chamber 61. That is, the pressure chamber 61 is connected to the downstream side of the first air channel 36.

  The tool holder 10 is provided with an oil passage 64 through which the oil sent from the storage chamber 55 flows. The oil flow passage 64 includes a flow passage 64a extending in the radial direction in communication with the storage chamber 55, and a flow passage 64b extending in the axial direction in communication with the flow passage 64a.

  The nozzle 43 is incorporated in the support portion 32 of the main body portion 30. Specifically, the nozzle 43 is disposed in a hole 32g formed on the central axis of the support portion 32, and is pressed and fixed to the bottom of the hole 32g by a nut 45 via a packing 46. ing. Thereby, the flow path 64 b of the oil flow path 64 communicates with the oil inlet 43 b of the nozzle 43. The nozzle 43 mixes oil supplied through the oil flow path 64 with air supplied through the second air flow path 37 (see FIG. 2) to generate oil mist and supply it to the tool T. . At the tip of the nozzle 43, an injection port 43c for injecting oil mist is provided.

  A nut 22 is screwed to the proximal end of the fixing portion 20. The axial attachment position of the tool T with respect to the tool holder 10 is regulated by abutting on the tip of the nut 22. In the inside of the tool T, through holes Ta and Tb which penetrate from the proximal end side to the distal end side of the tool T are formed.

  At the inlet of the flow passage 64 a of the oil flow passage 64, a flow rate adjusting unit 65 is provided which adjusts the flow rate of the oil flowing through the oil flow passage 64. The flow rate adjusting means 65 is provided with an adjusting hexagonal hole 65 a as an adjusting unit for adjusting the set flow rate value of the flow rate adjusting means 65. The flow rate adjusting means 65 has a cylindrical shape, and has a notch 65 b formed such that a part of the outer periphery of the flow rate adjusting means 65 is retracted inward in the radial direction.

9 (a) is a cross-sectional view taken along the line IX-IX in FIG. 7 with the oil passage 64 open, and FIG. 9 (b) is a line IX-IX in FIG. 7 with the oil passage 64 closed. FIG.
As shown in FIG. 9A, when the rotational direction position of the flow rate adjusting means 65 is set using the adjustment hexagonal hole 65a so that the notch 65b faces the flow path 64a, the oil flow path 64 is opened. . As shown in FIG. 9B, the rotational direction position of the flow rate adjusting means 65 is set using the adjustment hexagonal hole 65a so that the not cut outer peripheral surface 65c of the flow rate adjusting means 65 faces the flow path 64a. Then, the oil flow path 64 is shut off. Further, the intermediate state between the state of FIG. 9A and the state of FIG. 9B, that is, the rotation of the flow rate adjusting means 65 so that the not-cut outer peripheral surface 65c blocks only a part of the flow path 64a. Directional position may be set.

  Next, the operation of the tool holder 10 configured as described above will be described with reference to FIGS. 1 and 8. FIG. 8 is a cross-sectional view schematically showing an air flow passage and an oil flow passage in the tool holder 10.

  As shown in FIG. 8, before processing a work (not shown), oil is stored in advance in the storage chamber 55 of the oil tank 50 of the tool holder 10 through an injection port 56 provided on the outer peripheral surface of the oil tank 50. Is injected and stored in a predetermined amount. Then, the tool holder 10 in which a predetermined amount of oil is stored in the storage chamber 55 and the tool T is fixed to the fixing portion 20 is mounted on the tip of the main shaft 82 (see FIG. 1).

  As shown in FIG. 1, when processing a workpiece, high pressure air is supplied from the air supply device 93 through the supply pipe 92 into the passage 87a in the pull rod 87 of the main shaft 82. The air sent from the passage 87a of the main shaft 82 flows into the passage 30a formed in the main body 30 of the tool holder 10, as shown in FIG. The air sent through the passage 30a branches into the first air flow passage 36 and the second air flow passage 37 and flows.

  The air flowing through the first air flow passage 36 is supplied to the pressurizing chamber 61 through the passage 36 a, the passage 36 b, the regulator 41, the tube 36 c, the joint 40, the passage 44, the joint 63 and the passage 62. Here, the pressure of the air supplied to the pressurizing chamber 61 through the first air flow path 36 is adjusted by the regulator 41 to an appropriate value. Then, the piston 54 is pressed to the base end side by the air supplied to the pressure chamber 61, and pressure is applied to the oil stored in the storage chamber 55. As a result, pressurized oil is supplied to the nozzle 43 through the oil passage 64.

  On the other hand, the air flowing through the second air flow passage 37 is supplied to the nozzle 43 through the passage 37a, the passage 37b, the regulator 38, the tube 37c, and the joint 39. Here, the pressure of the air supplied to the nozzle 43 through the first air flow passage 36 is adjusted by the regulator 38 to an appropriate value.

  The nozzle 43 mixes the oil supplied through the oil flow path 64 with the air supplied through the second air flow path 37 to generate an oil mist, which is jetted from the injection port 43c. The oil mist injected from the injection port 43c is supplied to the processing unit through the through holes Ta and Tb (see FIG. 7) formed inside the tool T.

  As described above, the tool holder 10 according to the present embodiment includes the first air flow path 36 and the second air flow path 37 which branch and flow the air sent from the main shaft 82. Regulators 41 and 38 are provided in the first air flow channel 36 and the second air flow channel 37, respectively. In addition, the tool holder is connected to the storage chamber 55 for storing oil and the downstream side of the first air channel 36, and applies a pressure to the oil in the storage chamber 55, and from the storage chamber 55 And an oil flow path 64 through which the oil to be sent flows. The tool holder 10 is provided with a nozzle 43 which mixes the oil supplied via the oil flow path 64 with the air supplied via the second air flow path 37 to generate an oil mist and supply it to the tool T.

According to such this embodiment, it becomes possible to adjust separately the pressure of the air for pressing and injecting oil, and the pressure of the air for mixing. Therefore, since an appropriate pressure can be obtained for both, the quality such as the injection speed of the oil mist supplied to the tool T and the oil content can be well maintained.
That is, according to this embodiment, the tool holder 10 which can improve the quality of the oil mist supplied to the tool T can be provided.
Further, the tool holder 10 according to the present embodiment can be used by being attached to a spindle for coolant processing that processes a workpiece while supplying coolant from inside the spindle via a tool fixed to the tool holder. For this reason, it is not necessary to prepare a spindle having a special structure, and semi-dry processing using the tool holder 10 can be performed at low cost.

  Further, in the present embodiment, the nozzle 43 is incorporated in the main body 30, and the storage chamber 55 is disposed radially outside the main body 30. Therefore, the storage chamber 55 can be changed to an appropriate capacity and set without changing the configuration of the main body 30, and, for example, the capacity can also be increased. Further, the storage chamber 55 can be disposed radially outside of the nozzle 43 without being arranged side by side in the axial direction of the nozzle 43, so the axial dimension of the tool holder 10 can be shortened.

  Further, in the present embodiment, the storage chamber 55 has an annular space surrounding the main body portion 30. Therefore, the capacity of the storage chamber 55 can be increased only by slightly increasing the radial dimension of the tool holder 10.

  Further, in the present embodiment, an injection port 56 for injecting oil toward the storage chamber 55 is provided on the outer peripheral surface of the oil tank 50 having the storage chamber 55. Therefore, the oil can be injected into the storage chamber 55 from the outside in the radial direction of the tool holder 10. Therefore, the space required for the oil injection operation can be sufficiently secured, and the injection operation can be facilitated. In addition, when the oil injection operation is performed automatically using the oil injection device, the degree of freedom in the layout and operation range of the oil injection device is increased.

  Further, in the present embodiment, when one of the regulator 38 and the regulator 41 is rotated 180 degrees around the central axis of the main body 30, it is disposed so as to overlap the other. For this reason, before and after installation to the tool holder 10 of the regulators 38 and 41 as a pressure adjustment means, it can suppress that the rotation balance of the tool holder 10 changes.

  Further, in the present embodiment, a pair of parallel flat surfaces 32d and 32e are formed on the outer periphery of the body 32c with the central axis of the body 32c interposed therebetween, and between the pair of flat surfaces 32d and 32e. The distance is smaller than the maximum outer diameter of the body 32c. The regulator 38 and the regulator 41 are disposed on the radially outer side of each of the pair of flat surfaces 32 d and 32 e. Accordingly, an installation space can be secured on the side of the body 32 c of the main body 30, and the regulator 38 and the regulator 41 can be compactly stored in the installation space.

  Further, in the present embodiment, the regulators 38 and 41 are provided with adjusting hexagonal socket head portions 38 a and 41 a as adjusting units for adjusting the set pressure values of the regulators 38 and 41. Thereby, the set pressure values of the regulators 38 and 41 can be appropriately changed and adjusted, and the quality of the oil mist supplied to the tool T can be further improved.

  Further, the present embodiment includes the flow rate adjusting means 65 for adjusting the flow rate of the oil flowing through the oil flow path 64, and the flow rate adjusting means 65 performs adjustment as an adjusting unit for adjusting the set flow rate value of the flow rate adjusting means 65. A hexagonal hole 65a is provided. Thereby, the flow rate of the oil supplied to the nozzle 43 through the oil flow path 64 can be appropriately changed and adjusted, and the quality of the oil mist supplied to the tool T can be further improved.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure described in the said embodiment. The present invention can appropriately change the configuration without departing from the scope of the present invention, including appropriately combining or selecting the configurations described in the embodiments. Moreover, it is possible to add, delete, and replace a part of the configuration of the embodiment.

  For example, in the above-described embodiment, the regulators 41 and 38 are respectively provided in the first air flow channel 36 and the second air flow channel 37, but the present invention is not limited to this. A regulator as a pressure adjusting unit may be provided in any one of the first air flow passage 36 and the second air flow passage 37. In this case, the pressure of the air flowing through the air flow path not provided with the regulator is adjusted by pressure adjusting means provided on the upstream side of the main shaft 82, for example, the air supply device 93 and the supply pipe 92. be able to.

  Moreover, in the embodiment described above, the first air flow channel 36 and the second air flow channel 37 are configured to include a passage, a tube, a joint, and the like, but the present invention is not limited to this. The configurations of the first air flow channel 36 and the second air flow channel 37 can be changed as appropriate, and for example, the joint 40, the joint 39, etc. may be omitted by directly connecting the flow paths such as a passage or a tube.

  Further, in the above-described embodiment, although the one-surface restraint type in which only the outer peripheral surface of the tapered shape of the shank portion of the tool holder is in close contact with the tapered hole of the spindle, a so-called BT shank type is adopted. is not. For example, a so-called HSK shank type may be employed in which a tapered outer peripheral surface of the shank closely contacts the tapered hole of the main shaft and an inner end surface of the flange closely contacts the end surface of the main shaft.

DESCRIPTION OF SYMBOLS 10 Tool holder 20 fixing | fixed part 30 Body part 32c Body part 32d Flat surface 32e Flat surface 36 1st air flow path 37 2nd air flow path 38 Regulator (2nd pressure adjustment means)
38a Adjustment Hexagon Socket Head (Adjustment Part)
41 Regulator (1st pressure adjustment means)
41a Adjustment Hexagon Socket Head (Adjustment Section)
43 nozzle (oil mist generator)
Reference Signs List 50 oil tank 55 reservoir 56 injection port 61 pressure chamber 64 oil flow path 65 flow rate adjusting means 65a adjustment hexagonal hole (adjustment portion)
82 spindle T tool

Claims (9)

A fixing part for fixing the tool,
A main body portion provided on the proximal end side of the fixing portion and mounted on the tip end portion of the spindle;
A first air flow passage and a second air flow passage which branch and flow the air sent from the main shaft;
Pressure adjusting means provided in at least one of the first air passage and the second air passage;
A storage chamber for storing oil,
A pressure chamber connected to the downstream side of the first air flow passage for applying pressure to the oil in the storage chamber;
An oil flow path for flowing oil sent from the storage chamber;
An oil mist generator that generates an oil mist by mixing the oil supplied through the oil flow path and the air supplied through the second air flow path;
Tool holder characterized by having. The oil mist generator is built in the main body,
The tool holder according to claim 1, wherein the storage chamber is disposed radially outward of the main body portion.   The tool holder according to claim 2, wherein the storage chamber has an annular space surrounding the main body.   The tool holder according to claim 2 or 3, wherein an injection port for injecting oil toward the storage chamber is provided on an outer peripheral surface of an oil tank having the storage chamber.   The pressure adjustment means includes a first pressure adjustment means provided in the first air flow passage, and a second pressure adjustment means provided in the second air flow passage. A tool holder according to any one of the preceding claims.   The tool according to claim 5, wherein one of the first pressure adjusting means and the second pressure adjusting means overlaps the other when assuming that one of the first pressure adjusting means and the second pressure adjusting means is rotated 180 degrees around the central axis of the main body. holder. The main body portion has a cylindrical body portion,
A pair of parallel flat surfaces are formed on the outer periphery of the body, with the central axis of the body interposed therebetween.
The distance between the pair of flat surfaces is smaller than the maximum outer diameter of the body,
The tool holder according to claim 5 or 6, wherein the first pressure adjusting means and the second pressure adjusting means are respectively disposed on the radially outer side of each of the pair of flat surfaces. .   The tool holder according to any one of claims 1 to 7, wherein the pressure adjusting means is provided with an adjusting unit for adjusting a set pressure value of the pressure adjusting means. A flow rate adjusting means for adjusting the flow rate of oil flowing through the oil flow path;
The tool holder according to any one of claims 1 to 8, wherein the flow rate adjusting means is provided with an adjusting unit for adjusting a set flow rate value of the flow rate adjusting means.

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