JP5245542B2 - Tool holder - Google Patents

Description

  The present invention relates to a tool holder for holding a tool for processing a workpiece.

  Conventionally, Patent Document 1 discloses an example of a tool holder used in a processing apparatus that processes a workpiece while supplying a fluid for cooling and cooling (oil mist).

  In Patent Document 1, in a machine tool in which a tool holder is fixed to a tip end portion of a main shaft via a clamping means in a mechanically detachable manner, a mist-like cutting fluid passage in a holder formed at the center portion of the tool holder It is described that an extension passage in a mode extending backward is formed, and the mist cutting fluid passage in the main shaft and the mist cutting fluid passage in the holder are communicated with each other through the extension passage. Has been.

That is, the communicating tube is inserted into the center hole formed in the holder main body, and the tip of the communicating tube is closely inserted into the center hole of the blade stopper, and the inner hole front portion of the communicating tube and the center hole of the blade stopper are inserted into the holder. It becomes an inner mist-like cutting fluid passage. In addition, a base member is externally fitted to the rear part of the communication pipe protruding rearward (opposite to the tool) from the bottom surface of the recess hole formed in the holder main body, and the front end collar of the base member is used as the bottom surface of the recess. Fix through the screw. The rear part of this communication pipe and the inside of the cap member serve as an extension passage. In this way, oil mist is prevented from leaking from the gaps between the parts.
JP 2001-18148 A

However, in the case of the tool holder shown in Patent Document 1 described above, a base member and a communication pipe are provided between the mist cutting fluid passage in the main shaft and the blade stopper. Since the the cap member and the communication pipe is made of separate members, a possible oil mist from leaking in between the mouthpiece member and the communication pipe. Therefore, it is necessary to take measures against leakage between the base member and the communication pipe in addition to between the blade stopper and the blade.

  Further, the provision of the communication pipe may cause a step in the wall surface through which the oil mist flows. If a step is generated in this way, there is a possibility that a loss occurs in the conveyance of the oil mist.

  The present invention has been made in view of the above problems, and a tool holder that can suppress fluid leakage according to the position of the tool, reduce fluid leakage countermeasures, and supply oil mist smoothly. The purpose is to provide.

In order to achieve the above object, a tool holder according to claim 1 holds a tool having a fluid supply hole for processing a workpiece while jetting a lubricating cooling fluid, and is driven to rotate. Tool holder that is detachably held by a spindle device comprising a main shaft portion that is formed, a through hole formed along the rotation axis of the main shaft portion, and a fluid supply pipe that is disposed in the through hole and is a fluid flow path A holder main body having a through hole formed along the rotating shaft, provided with a mounting portion that is hermetically held by the spindle device on one end side, and a tool holding portion that holds a tool on the other end side. And a fluid passage between the fluid supply pipe and the tool side that is fixed to the holder body in a state of being inserted into the through hole of the holder body, and is formed along the rotation axis. It consists of a cylindrical unit with holes, and flows at one open end. An annular packing arranged between a fluid supply member into which a part of the supply pipe is inserted, a fluid supply member, and a fluid supply pipe inserted into the opening end of the fluid supply member to prevent fluid leakage And a cylindrical member having a through-hole formed along the rotation axis, which is disposed in the through-hole of the holder body, and the end of the fluid supply member is inserted into one of the opening sides and is substantially And a leakage preventing member disposed with the end of the tool substantially in close contact with the other opening side, and the packing includes an opening into which the fluid supply pipe is inserted, In the part facing the supply direction, a groove part provided over the entire circumference of the part, a first hand which is divided into two hands by the groove part and which is in contact with the outer wall surface on the fluid supply pipe side, and the groove part The other hand is divided and provided on the fluid supply member A second hand disposed in the attachment portion, and the first hand is provided so as to be inclined so that the distance from the second hand becomes wider as it goes in the fluid supply direction. in which force is characterized Rukoto pushed open to the fluid supply pipe side according increases.

  By doing in this way, the fluid supply pipe, the fluid supply member, and the fluid leakage between the fluid supply member and the tool can be suppressed, and the distance between the end of the fluid supply member and the end of the tool ( That is, in addition to being able to adjust the position of the leakage prevention member according to the position of the tool), the fluid supply member disposed between the fluid supply pipe and the leakage prevention member is configured as a single unit, so that the fluid supply member There is little fear of fluid leaking in this case, and it is not necessary to take measures against fluid leakage. In addition, by configuring the fluid supply member as an integral member, it is possible to suppress or prevent a step from being generated on the wall surface of the through-hole through which the fluid flows, so that the fluid can flow smoothly.

Further, as shown in claim 2, the outer peripheral surface of the through hole and the leakage preventing member Holder body is corresponding screw mechanism formed with each other, leakage preventing member, threaded into the through hole of the Holder body May be arranged. By doing so, the position of the leakage preventing member can be easily adjusted.

Embodiments of the present invention will be described below with reference to the drawings. Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a partial cross-sectional view showing a schematic configuration of a processing apparatus according to an embodiment of the present invention. That is, FIG. 1 schematically shows a cross-sectional configuration of the vicinity of the tip of the spindle device 30 on which the tool holder 10 holding the tool 20 (for example, a cutting tool) is mounted, cut along a plane including the rotation axis. . FIG. 2 is a cross-sectional view showing a schematic configuration of the coolant hose in the embodiment of the present invention. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a plan view showing packing of the processing apparatus in the embodiment of the present invention. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a cross-sectional view showing a schematic configuration of the leakage preventing member in the embodiment of the present invention. FIG. 8 is a view taken along the line VIII of FIG. 9 is a IX view of FIG. FIG. 10 is a cross-sectional view of a leakage preventing member portion of the processing apparatus according to the embodiment of the present invention. FIG. 11 is a cross-sectional view of a leakage preventing member portion of a processing apparatus in a comparative example.

  In the processing apparatus according to the present embodiment, the tool holder 10 on which a tool 20 for performing cutting or the like on a workpiece (workpiece or workpiece) can be attached to or detached from the spindle device 30 (replaceable). By holding and rotating the spindle device 30, the tool holder 10 on which the tool 20 is mounted is rotated to process the workpiece. That is, when processing the workpiece, the main shaft portion 41, the tool holder 10 and the tool 20 rotate, while the fluid supply pipe 61 does not rotate because it is fixed to the non-rotating portion of the main shaft device 30. For this reason, oil mist (also referred to as fluid or coolant) introduced from the rear end portion of the fluid supply pipe 61 flows through the fluid supply pipe 61 to the tip end side (tool side) without being affected by the centrifugal force. Oil mist flowing out from the tip of the fluid supply pipe 61 is supplied to the tip of the tool 20 through the through hole 80 of the coolant hose 70, the space 12 of the tool holder 10, and the through hole 22 of the tool 20. And lubrication and cooling of the workpiece. Thus, the oil mist introduced from the rear end side of the fluid supply pipe 61 is supplied to the tool 20 without being affected by the centrifugal force associated with the rotation of the spindle device 30. Therefore, a sufficient amount of oil mist can be supplied to the tip side of the tool 20.

  A spindle section 41 to which the tool holder 10 is detachably mounted as shown in FIG. 1 is rotatably supported by a hollow cylindrical housing (not shown) of the spindle apparatus 30 and is rotated by a motor (not shown). It is designed to be driven. The main shaft portion 41 is formed with a through hole 42 penetrating along the rotation axis.

  A holder mounting hole 44 in which the tool holder 10 is mounted is formed in the holder mounting portion 43 located near the tip of the through hole 42 in the main shaft portion 41. The inner peripheral surface 46 of the holder mounting hole 44 is formed in a tapered shape having a larger diameter toward the distal end side of the main shaft portion 41. On the outside of the holder mounting hole 44, an annular end face 45 is formed that is substantially perpendicular to the rotation axis.

  The through-hole 42 has a holding member that rotates together with the main shaft portion 41 and holds a part of the tool holder 10 in an airtight manner in a detachable manner. This holding member includes a sleeve 51, a clamp member 56, a tension coil spring 58, and a draw bar 59.

  The draw bar 59 is for operating the attachment / detachment of the tool holder 10 to / from the holder mounting hole 44, and is provided along the rotation axis of the spindle device 30. The draw bar 59 is urged toward the rear end side (the side opposite to the tool) of the main shaft portion 41 by a tension coil spring 58. In addition, the draw bar 59 is formed with a through-hole through which the fluid supply pipe 61, which will be described later, is disposed, penetrating along the rotation axis. A cylindrical sleeve 51 protruding from the holder mounting hole 44 is attached to the leading end side (tool side) of the draw bar 59. On the outer peripheral surface of the sleeve 51, a stepped portion 52 having a diameter enlarged toward the distal end side is formed. Further, a packing mounting portion 55 is provided on the sleeve 51 (at the front end side). The packing mounting portion 55 is provided with a rubber annular packing 53 that seals between a later-described coolant hose (fluid supply member) 70 attached to the tool holder 10. The holding member detachably holds the tool holder 10 (coolant hose 70) with the annular packing 53 in an airtight state.

  A plurality of clamp members 56 are slidably provided on the outer peripheral surface of the sleeve 51 on the outer peripheral side of the sleeve 51. On the tip end side of the clamp member 56, a locking portion 57 protruding to the outer peripheral side is formed. When the clamp member 56 slides on the outer peripheral surface of the sleeve 51 and the locking portion 57 rides on the stepped portion 52, the locked portion 16 of the tool holder 10 described later is locked by the locking portion 57. ing. On the other hand, when the draw bar 59 and the sleeve 51 are moved toward the distal end side of the main shaft portion 41 against the urging force of the tension coil spring 58, the engaging portion 57 of the clamp member 56 riding on the stepped portion 52 becomes the outer peripheral surface of the sleeve 51. Move to the rotating shaft side while sliding. Thereby, the locking by the locking part 57 of the locked part 16 of the tool holder 10 is released.

  A fluid supply pipe 61 that has a through hole 62 and supplies oil mist (fluid) as a lubricating cooling fluid to the tool is inserted in the through hole of the draw bar 59. The fluid supply pipe 61 is fixed to a non-rotating portion (not shown) of the spindle device 30 via, for example, an O-ring. The fluid supply pipe 61 is rotatably supported by the sleeve 51 via a bearing (not shown). The fluid supply pipe 61 may be rotatably fixed to a non-rotating portion (not shown) of the spindle device 30 through a bearing or the like, for example. The oil mist is introduced into the fluid supply pipe 61 from the rear end side of the main shaft portion 41 and flows through the fluid supply pipe 61 toward the tip end side (tool side). Since the fluid supply pipe 61 is rotatably fixed to a non-rotating portion (not shown) of the spindle device 30, it does not rotate even when the machining apparatus is in operation (when the spindle device 30 is rotated). Therefore, the oil mist flowing in the fluid supply pipe 61 flows without being affected by the centrifugal force accompanying the rotation of the spindle device 30.

  The tool holder 10 is a two-surface constraining type (for example, HSK shank type, HSK type) that comes into contact with both the inner peripheral surface 46 and the end surface 45 of the holder mounting hole 44 when mounted on the main shaft portion 41. The tool holder 10 includes a holder main body 11, a space portion 12 that penetrates along the rotation axis of the holder main body 11, a coolant hose attachment portion 19, a coolant hose 70, a leakage prevention member 90, and the like.

  On one end side of the holder main body 11, a tapered portion 15 for mounting on the main shaft portion 41 is provided. The tapered portion 15 is formed so as to protrude from the holder main body 11 into a hollow cylindrical shape. On the outer periphery of the tapered portion 15, a tapered surface 15 a formed in a tapered shape having a larger diameter toward the holder body 11 side is formed. When the tool holder 10 is inserted into the holder mounting hole 44 of the main shaft portion 41, the tapered surface 15 a comes into contact with the inner peripheral surface 46 of the holder mounting hole 44. At the tip of the taper portion 15, an annular locked portion 16 that protrudes toward the inner peripheral side and is partially thick and can be locked by the locking portion 57 of the clamp member 56 is formed.

  The bottom surface 18 inside the taper portion 15 is formed with a concave coolant hose attachment portion 19 for attaching the coolant hose 70 (concave shape on the tool side with respect to the bottom surface 18), and the coolant hose attachment portion 19 has a coolant on the bottom surface. A through hole into which the hose 70 is inserted is formed. A screw groove (female screw) corresponding to the screw 70a (male screw) is formed on the inner peripheral surface of the coolant hose attachment portion 19. The screw 70a has a hole through which a part of the coolant hose 70 can penetrate in the center. The coolant hose 70 is in a state in which a part of the coolant hose 70 is inserted into a through hole formed in the bottom surface of the coolant hose attachment portion 19 (the flange portion 72 of the coolant hose 70 contacts the bottom surface of the coolant hose attachment portion 19. In this state, it is fixed to the tool holder 10 with screws 70a.

  That is, the screw 70 a presses the flange portion 72 of the coolant hose 70 against the bottom surface of the coolant hose attachment portion 19 by screwing the screw 70 a to the coolant hose attachment portion 19 where the coolant hose 70 is disposed. In this way, the coolant hose 70 is fixed to the tool holder 10.

  When the tool holder 10 is mounted on the main shaft portion 41, the coolant hose 70 is fitted into the sleeve 51 (via the packing 53), and the tip of the fluid supply pipe 61 is a through hole in the coolant hose 70. 80 (through packing 54).

  As shown in FIGS. 2 to 3, the coolant hose 70 is formed of a cylindrical integrated body having a through hole 80 provided along the rotation axis of the spindle device 30, and includes a tool side cylinder portion 71 and a flange portion. 72, a supply pipe side cylinder part 73, a packing attaching part 76, a bush 77, and the like. A part of the fluid supply pipe 61 is inserted into one opening end (supply pipe side opening 75), and the packing 54 is disposed between the fluid supply pipe 61 and the inserted fluid supply pipe 61. The bush 77 is provided to easily provide the packing mounting portion 76 in the through hole of the coolant hose 70.

  By the way, the tool holder 10 can be attached to and detached from the spindle device 30. That is, the tool holder 10 can be exchanged depending on the processing object, the type of tool, and the like. The tool holder 10 in the present embodiment is an HSK type, and the spindle device 30 corresponds to the HSK type tool holder 10. That is, in a state where the tool holder 10 is mounted on the spindle device 30, a part (tip portion) of the fluid supply pipe 61 is disposed inside the coolant hose 70 fixed to the tool holder 10. In such a case, a gap is always required between the inner peripheral surface of the coolant hose 70 and the outer peripheral surface of the fluid supply pipe 61.

  However, when there is a gap between the coolant hose 70 and the fluid supply pipe 61 in this way, oil may leak from this gap. Usually, the oil mist flows toward the tip of the tool 20. However, when the diameter of the oil mist supply hole at the tip of the tool 20 (that is, the diameter of the oil mist outlet) is sufficiently smaller than the diameter of the fluid supply pipe 61, the fluid supply pipe 61, the through hole 80, the space portion, and the like. 12. The internal pressure in the through hole 22 may increase and oil mist may leak from the gap.

  Therefore, as shown in FIG. 2 and the like, a packing mounting portion 76 is provided on the inner peripheral surface of the coolant hose 70, and the packing 54 is provided there. As shown in FIGS. 5 and 6, the packing 54 has an opening diameter (diameter of the opening 540) as the force acting on the oil mist leaking from the gap (oil mist flowing in the direction opposite to the supply direction) increases. ) Is deformed to be smaller. Specifically, the packing 54 is an annular elastic member having an opening 540 into which the fluid supply pipe 61 is inserted, and has a Y-shaped cross section. That is, the packing 54 has a divided portion having a first hand 541 and a second hand 542 divided by the groove portion 543. And this packing 54 is arrange | positioned at the coolant hose 70 (packing attachment part 714) so that a division part (a groove part 543, the 1st hand 541, the 2nd hand 542) may face the supply direction of oil mist. Further, the first hand 541 is provided to be inclined with respect to the oil mist supply direction, and is disposed between the coolant hose 70 and the fluid supply pipe 61.

  In this way, when oil mist leaks from the gap, the leaked oil mist contacts the first hand 541 of the packing 54 and spreads the first hand 541. As described above, when the first hand 541 is pushed and spread, the degree of adhesion between the packing 54 and the fluid supply pipe 61 is improved. That is, the packing 54 is in close contact with the fluid supply pipe 61 even when the oil mist does not leak from the gap, but the degree of close contact with the fluid supply pipe 61 increases as the oil mist leakage increases. It is preferable because the aperture is reduced and the leakage prevention effect is improved.

  Further, the packing 54 rotates with the spindle device 30, whereas the fluid supply pipe 61 does not rotate with the spindle device 30. Therefore, if the packing 54 and the fluid supply pipe 61 are always in close contact with each other, the life of the packing 54 may be shortened. However, in the packing 54 in the present embodiment, when a small amount of oil mist leaks from the gap, the force that pushes the first hand 541 by the oil mist is weak, and there is a slight gap between the packing 54 and the fluid supply pipe 61. Oil mist easily enters. As described above, when a small amount of oil mist enters between the packing 54 and the fluid supply pipe 61, the oil mist becomes lubricating oil and can extend the life of the packing 54.

  In the present embodiment, an example in which the packing 54 having a Y-shaped cross section is used as a leakage preventing member for preventing leakage, but the present invention is not limited to this. Any material that can prevent oil mist from leaking may be used.

  The holder body 11 has a flange portion 14 that is provided adjacent to the tapered portion 15 and has a larger outer diameter than the tapered portion 15. An annular end surface 17 adjacent to the tapered surface 15a of the flange portion 14 is formed substantially perpendicular to the rotation axis. When the tool holder 10 is inserted into the holder mounting hole 44 of the main shaft portion 41, the end surface 17 of the flange portion 14 comes into contact with the end surface 45 of the main shaft portion 41.

  On the other end side of the holder body 11, a tool holding unit 13 that holds a tool 20 for processing a workpiece is provided. The tool body 21 of the tool 20 is formed with a through hole 22 that penetrates from the rear end portion held by the tool holding portion 13 to the front end portion side. When the tool 20 is held by the tool holding portion 13, the through hole 22 formed in the tool 20 and the through hole 80 of the coolant hose 70 are arranged coaxially via the space portion 12 of the tool holder 10. As a result, the oil mist that has flowed out of the fluid supply pipe 61 into the space 12 of the tool holder 10 flows through the through hole 22 of the tool 20 to the tip side.

  However, the depth at which the tool 20 is inserted into the holder body 11 is not always constant. Therefore, a gap may be generated between the end of the tool 20 and the end of the coolant hose 70. FIG. 11 is a cross-sectional view of a leakage preventing member portion of a processing apparatus in a comparative example. As shown in FIG. 11, when a gap is generated between the end of the tool 20 and the end of the coolant hose 70, the coolant may leak from this gap.

  Therefore, as shown in FIG. 1, the tool holder 10 in the present embodiment is provided with a leakage preventing member 90 disposed between the tool 20 and the coolant hose 70. As shown in FIGS. 7-9, it is a cylindrical member which has the through-hole 93 formed along the rotating shaft. Further, the leakage preventing member 90 is disposed in the through hole of the tool holder 10, and the end (the tool side opening 74 side) of the coolant hose 70 is on one opening side (supply pipe side opening 91). The tool 20 is disposed in a state of being in close contact with each other, and the end of the tool 20 is disposed in a state of being in close contact with the other opening side (tool side opening 92).

  Further, the leakage preventing member 90 is arranged in a state movable with respect to the through hole of the tool holder 10 in the direction of the rotation axis. In the present embodiment, the screw holes corresponding to each other are formed in the through hole of the tool holder 10 and the outer peripheral surface of the leakage preventing member 90, and the leakage preventing member 90 is screwed into the through hole of the tool holder 10. This example is adopted. That is, as shown in FIG. 7 and the like, the leakage prevention member 90 includes a screw portion 94 (for example, a male screw) on the outer peripheral surface. And although illustration is abbreviate | omitted, in the through-hole of the tool holder 10, the screw part (for example, internal thread) corresponding to the screw part 94 is provided. Thus, by providing the screw mechanism on the through hole of the tool holder 10 and the outer peripheral surface of the leakage preventing member 90, the position of the leakage preventing member 90 can be easily adjusted.

  The outer diameter of the portion of the coolant hose 70 inserted into the leak prevention member 90 and the inner diameter of the through hole 93 of the leak prevention member 90 are substantially the same, so that the leak prevention member 90 and the coolant hose 70 are substantially the same. It can be set as the state which adhered. In addition, the end surfaces of the tool 20 and the leakage preventing member 90 that are in contact with each other are substantially flush with each other, so that the leakage preventing member 90 and the tool 20 can be in close contact with each other. In addition, you may make it chamfer the end surface which the tool 20 and the leak prevention member 90 contact mutually. For example, the portion of the tool 20 that contacts the leakage preventing member 90 is chamfered, and the portion of the leakage prevention member 90 that contacts the tool 20 is chamfered so as to have a hollow shape corresponding to the mountain shape. By doing in this way, the adhesiveness of the tool 20 and the leak prevention member 90 can be improved, and the leak of oil mist can be suppressed further.

  Thus, the tool holder 10 in the present embodiment can suppress the leakage of the coolant between the fluid supply pipe 61 and the coolant hose 70 and between the coolant hose 70 and the tool 20, and the end of the coolant hose 70. In addition to being able to adjust the position of the leakage prevention member 90 according to the distance between the tool 20 and the end of the tool 20 (that is, the position of the tool 20), the coolant disposed between the fluid supply pipe 61 and the leakage prevention member 90 Since the hose 70 is formed as a single body, there is little fear of coolant leaking in the coolant hose 70, and there is no need to take measures against coolant leakage. In addition, by configuring the coolant hose 70 as an integral object, it is possible to suppress or prevent a step from being generated on the wall surface of the through hole through which the oil mist flows, so that the oil mist can flow smoothly.

It is a fragmentary sectional view which shows schematic structure of the processing apparatus in embodiment of this invention. It is sectional drawing which shows schematic structure of the coolant hose in embodiment of this invention. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is a top view which shows the packing of the processing apparatus in embodiment of this invention. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is sectional drawing which shows schematic structure of the leak prevention member in embodiment of this invention. FIG. 8 is a VIII view of FIG. 7. It is IX view of FIG. It is sectional drawing of the leak prevention member part of the processing apparatus in embodiment of this invention. It is sectional drawing of the leak prevention member part of the processing apparatus in a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tool holder, 11 Holder main body, 12 Space part, 13 Tool attaching part (tool holding part), 14 Flange part, 15 Tapered part, 15a Tapered surface, 16 Locked part, 17 End face, 18 Bottom face, 19 Coolant hose attachment Part, 20 tool, 21 tool body, 22 through hole, 30 spindle device, 41 spindle part, 42 through hole, 43 holder mounting part, 44 holder mounting hole, 45 end face, 46 inner peripheral face, 51 sleeve, 52 step part, 53 packing, 54 packing, 55 packing mounting part, 56 clamp member, 57 locking part, 58 tension coil spring, 59 draw bar, 61 fluid supply pipe, 62 through hole, 70 coolant hose, 71 tool side cylinder part, 72 flange part, 73 Supply pipe side cylinder, 74 Tool side opening, 75 Supply pipe side opening, 76 Packing attachment, 77 Bush, 80 Through hole, 90 Leakage prevention member, 91 Supply pipe side opening, 92 Tool side opening, 93 Through hole, 94 Screw part, 540 Opening, 541 First hand, 542 Second hand, 543 Groove

Claims (2)

Holds a tool having the fluid supply hole for processing a workpiece while jetting a lubricating cooling fluid, and is formed along a main shaft portion that is rotationally driven and a rotation axis of the main shaft portion. A tool holder that is detachably held in a spindle device that includes a through hole that is formed and a fluid supply pipe that is disposed in the through hole and that is a flow path of the fluid,
A holder main body having a through-hole formed along the rotation axis, provided with a mounting portion that is hermetically held by the spindle device on one end side, and a tool holding portion that holds the tool on the other end side; ,
The fluid passage is configured between the fluid supply pipe and the tool side by being fixed to the holder body in a state of being inserted into the through hole of the holder body, and along the rotation axis. A fluid supply member made of a cylindrical one-piece having a formed through hole, and a part of the fluid supply pipe inserted into one open end;
An annular packing for preventing leakage of the fluid, disposed between the fluid supply member and the fluid supply pipe inserted into the open end of the fluid supply member;
A cylindrical member having a through hole formed along the rotation axis, which is disposed in the through hole of the holder body, and an end of the fluid supply member is inserted into one opening side A leakage preventing member that is disposed in a substantially intimate contact state and disposed in a state in which the end portion of the tool is substantially in close contact with the other opening side ,
The packing includes an opening into which the fluid supply pipe is inserted, a groove provided over the entire circumference of the opening facing the fluid supply direction, and one hand divided in two by the groove. A first hand that is in contact with the outer wall surface on the fluid supply pipe side, and a second hand that is the other hand divided by the groove and is disposed on an attachment portion provided on the fluid supply member. Prepared,
The first hand is provided to be inclined so that the distance from the second hand becomes wider as it goes in the fluid supply direction, and the fluid supply increases as the force acting on the fluid increases. tool holder, characterized in Rukoto pushed apart on the tube side.   The through hole of the holder body and the outer peripheral surface of the leakage prevention member are formed with screw mechanisms corresponding to each other, and the leakage prevention member is screwed into the through hole of the holder body. The tool holder according to claim 1.

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