JP2003181742A - Tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely supply a cutting fluid to a cutting tool and a cutting position, and to change the direction of a cutting fluid jet to the cutting tool and the cutting position, by simplifying configuration of a cutting fluid passage of a collet to be inserted into a holder body of a tool holder, by easily assembling it, and by preventing the outflow of the cutting fluid from the outside periphery of the collet. <P>SOLUTION: Slotted portions 41, 42 are formed on a collet 40 in order to lead the cutting fluid from a groove 56 to the tip end of the collet 40 by communicating with the groove 56 arranged on a holder body 30 for a passage for supplying the cutting fluid. A sealing cap 50 is dismountably screwed to a tip end flange 43 of the collet 40 so as to prevent the outflow of the cutting fluid by coming into contact with a tip end face 33a of a chuck sleeve 33 and an outside periphery of a shank Ts of a cutting tool T. A plurality of cutting fluid jetting nozzles 60 are arranged at the outer portion of the front end face of the sealing cap 50 so as to swing. Each of the cutting fluid jetting nozzles 60 is communicated with the slotted portions 41, 42 by a fluid passage 53 formed on the sealing cap 50. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool such as a reamer, an end mill or the like, which is used to cut an object to be machined, and which is supplied with an appropriate amount of coolant such as coolant or cutting oil supplied from the machine tool side. The present invention relates to a tool holder that can be surely supplied to a cutting place.

[0002]

2. Description of the Related Art Conventionally, when cutting a work material such as metal with a cutting tool, a large amount of cutting fluid such as coolant or cutting oil is supplied to a tool and a cutting place to improve the cutting workability. ing. By the way, the cutting tool is chucked to a tool holder mounted on a spindle of a machine tool via a collet, and supplies cutting fluid supplied from the machine tool side to a supply hole of the tool holder and a slitting portion of the collet, or a cutting tool. It is designed to be supplied through an oil supply hole formed in the central portion penetrating in the axial direction of the tool. Many tool holders provided with the fluid passage for supplying the cutting fluid have been developed and are in use. For example, conventionally, there is a tool holder of this type shown in FIGS.

The tool holder shown in FIGS. 1 and 2 was proposed by the applicant of the present application in Japanese Patent No. 3035167, and in the drawings, 1 is an insert which is attached to the spindle of a machine tool at one end. The tool holder is provided with a shank portion 2 for use with the tool holding means 5 such as a collet 4 for holding the tool, which is fitted into the chuck cylinder 3 at the other end. The tool holding means 5 is configured to be able to hold the shank portion Ts of the cutting tool T via the cylindrical collet 4. The collet 4 is formed in a cylindrical shape having an insertion hole 6 for inserting the shank portion Ts of the cutting tool T in a central portion thereof, has a flange portion 7 at a tip portion thereof, and the insertion portion at an outer peripheral portion near the tip portion thereof. A plurality of axial slitting portions 8 reaching the holes 6 are formed. A cavity 9 is formed inwardly on the rear end side of the collet 4, and a tail plug 12 having a central hole 11 is screw-fitted into the rear end opening 10 to provide a tail plug. Body 12
An O-ring 13 that comes into contact with the inner wall surface of the tool holder 1 is provided on the outer peripheral surface of so that the cutting fluid does not leak through the outer peripheral surface of the collet 4.

The tool holding means 5 is rotatably arranged via an outer fitting chuck cylinder 3 into which the collet 4 is fitted, and a bearing 16 and the like mounted on a retainer 15 around the outer fitting chuck cylinder 3. The fastening tool 17 is rotated in the forward or reverse direction to reduce or expand the diameter of the collet 4 holding the cutting tool T via the external fitting chuck cylinder 3. It is designed to perform a diameter operation.

Further, a plurality of fluid passages 18 along the axial direction are formed in the collet 4 at the outer peripheral portion of the insertion hole 6 and between the adjacent slitting portions 8. There is. Each fluid passage 18 is configured to penetrate through the collet 4 in the axial direction including the central hole 11 of the cavity portion 9 and the tail plug 12, and the fluid supply passage 19 which is the central hole of the tool holder 1. It is possible to communicate with.

Furthermore, the inside of the slitting portion 8 is formed in the slitting portion 8 so as to come into contact with the inner wall surface 3a of the outer fitting chuck cylinder portion 3 and the outer peripheral surface of the shank portion Ts of the cutting tool T, respectively. A rod-shaped oil stopper 20 formed of an elastic body such as rubber or a soft resin that traverses is provided, and the cutting fluid flows from the hollow portion 9 through the slit portion 8 to the end portion on the cutting tool T insertion side. I try to prevent this.

In the oil stopper 20, the cutting fluid supplied from the fluid supply path 19 passes through the slitting portion 8 to collect the collet 4
The cutting fluid is prevented from flowing out to the tip end portion thereof so that the cutting fluid is surely ejected from the fluid passage 18.
Reference numeral 21 is a spherical ejection port member that is attached to the distal end opening portion of the fluid passage 18 formed in the axial direction of the distal end portion of the collet 4 and that can change the ejection angle of the cutting fluid. A jet hole 22 penetrating in the diametrical direction is formed in the. Therefore, the ejection angle of the cutting fluid can be appropriately adjusted for each cutting tool T to be used according to the protruding length of the cutting tool T from the insertion hole 6, the diameter, the shape of the tip blade portion, the rotation speed, and the like. You can do it.

[0008]

In the conventional tool holder constructed as described above, the production of the fluid passage 18 of the collet 4, which is the passage of the cutting fluid supplied from the machine tool side, becomes extremely complicated, There is a problem that the manufacturing cost of the collet becomes high. Further, the cutting fluid passes from the hollow portion 9 through the slit portion 8 to the collar portion 7 on the cutting tool T insertion side.
Since the oil stopper 20 made of an elastic body that is attached to prevent the oil from flowing out to the end including the oil deteriorates with age due to long-term use, the cutting fluid cannot be reliably prevented from flowing out. For each cutting tool T to be used, the cutting fluid can be reliably supplied by appropriately adjusting the projection length, diameter, shape of the tip blade portion, rotation speed, etc. of the cutting tool T from the insertion hole 6. There is a problem that you cannot do it.

An object of the present invention is to simplify the structure of the cutting fluid supply passage of the collet fitted in the holder body of the tool holder, to facilitate the assembly, and to prevent the cutting fluid from flowing out from the outer periphery of the collet relatively easily. It is possible to ensure the supply of the cutting fluid to the cutting tool and the cutting location, and at the same time, to ensure the supply of the cutting fluid to the cutting location by the cutting tool and the tool whose diameter of the blade portion is larger than the diameter of the shank portion, and An object of the present invention is to provide a tool holder capable of freely changing the jetting direction to a cutting location.

[0010]

In order to achieve the above object, the invention of claim 1 has a shank portion which is inserted into a spindle of a machine tool at one end, and has an axis line of the shank portion at the other end. A holder main body having a chuck cylinder extending in a coincident manner and having a tapered surface on the outer peripheral surface, the diameter of which decreases toward the tip side, a tightening cylinder for tightening the chuck cylinder from the outer peripheral surface, and the chuck cylinder. And a collet for gripping the shank portion of the tool, and a tool holder for removably gripping the tool by reducing or restoring the diameter of the chuck cylinder by the tightening cylinder. A fluid passage communicating with the fluid supply passage and guiding the fluid from the fluid supply passage to the tip of the collet is provided in the collet, and the fluid passage closely contacts the tip surface of the chuck cylinder and the outer periphery of the shank portion of the tool. A sealing cap for stopping the outflow of the fluid is provided at the tip of the collet in a detachable manner, and a plurality of fluid ejection nozzles are swingably provided at a position near the outer periphery of the front end surface of the sealing cap. The fluid ejection nozzle and the fluid passage of the collet are connected by a fluid passage formed in the sealing cap.

According to a second aspect of the present invention, in the tool holder according to the first aspect, the tool has a blade portion having a diameter larger than a diameter of the tool shank portion, and the sealing cap has a diameter of the blade portion. The location of the fluid ejection nozzle, which is formed to have a larger diameter and is provided in this sealing cap, is located outside the diameter of the blade portion.

According to a third aspect of the present invention, in the tool holder according to the first or second aspect, the tip portion of the collet has a collar portion having a diameter larger than the diameter of the collet, and the outer peripheral surface of the collar portion has a male screw. Part is formed, an internal thread part is formed on the inner peripheral surface of the side wall part of the sealing cap, and the sealing cap is attached to the tip part of the shank part by screwing the internal thread part to the external thread part. It is characterized by being done.

According to a fourth aspect of the present invention, in the tool holder according to any one of the first to third aspects, a sealing material is interposed between a surface where the tip end surface of the chuck cylinder and the sealing cap come into close contact with each other. It is characterized by being.

According to a fifth aspect of the present invention, in the tool holder according to any one of the first to fourth aspects, the inner peripheral surface of the central through hole of the sealing cap, through which the shank portion of the tool penetrates, and the A seal material is interposed between the surfaces of the tool shank portion that are in close contact with the outer peripheral surface.

According to a sixth aspect of the present invention, in the tool holder according to the first aspect, the collet with the shank portion of the tool fitted and held therein is inserted into the chuck cylinder, and the chuck cylinder is tightened with the tightening cylinder. After that, the cap for sealing is attached to the tip of the collet.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a tool holder according to the present invention will be described below with reference to the drawings. Figure 3
FIG. 4 is a vertical sectional side view of a tool holder according to an embodiment of the present invention, FIG. 4 is a cross-sectional plan view taken along line 4-4 of FIG. 3, and FIG. 5 is a bottom view of a sealing cap according to an embodiment of the present invention.

The cutting tool T applied to the tool holder 100 shown in this embodiment has a blade portion Tb having a diameter larger than the diameter of the tool shank portion Ts like the composite burnishing reamer shown in FIG. . As shown in FIG. 3, the tool holder 100 has a holder main body 30, and the holder main body 30 has a taper shank portion 31 inserted into a spindle of a machine tool (not shown) and the taper shank portion 3.
1. A gripping flange 32 formed at the large-diameter side end portion of No. 1 and the taper shank portion 3 in the direction opposite to the taper shank portion 31 from the end surface on the side opposite to the taper shank portion of the flange 32.
The cylindrical chuck cylinder 33 is provided so as to extend along the axis of No. 1 and has a tapered surface 32a on the outer peripheral surface, the diameter of which decreases from the flange 32 toward the tip.

Further, in FIG. 3, reference numeral 34 denotes a roller holding cylinder which is loosely fitted around the outer circumference of the chuck cylinder 33. The roller holding cylinder 34 has a tip end at a taper angle substantially similar to the taper surface 33a of the chuck cylinder 33. It is formed from a cylindrical body whose diameter decreases as it goes to. In addition, this roller holding cylinder 3
4 is held by a retaining ring 35 provided on the outer periphery of the tip end of the chuck cylinder 33 so as not to fall off from the chuck cylinder 33.

A large number of needle rollers 36, which are fitted in the roller holding cylinder 34 at a predetermined angle in the circumferential direction with respect to the axis of the roller holding cylinder 34, are arranged in the circumferential direction. Further, each needle roller 36 is formed to have a diameter larger than the wall thickness of the roller holding cylinder 34.
Each needle roller 36 protruding toward the inner peripheral surface of the roller holding cylinder 34 is brought into contact with the tapered surface 33a of the chuck cylinder 33,
Each needle roller 36 protruding toward the outer peripheral surface side of the roller holding cylinder 34 is configured to abut an inner peripheral surface of a tightening cylinder 37, which will be described later.

The tightening cylinder 37 has a diameter that reduces the diameter of the chuck cylinder 33 and tightly grips a target tool, and a needle roller 36 held by a roller holding cylinder 34 on the outer circumference of the chuck cylinder 33. Are fitted through. The inner peripheral surface of the tightening cylinder 37 is formed as a tapered cylindrical surface whose diameter decreases from the end facing the flange 32 to the tip. Further, a retaining ring 38 that also serves as a seal is attached to the inner periphery of the proximal end portion of the tightening tube 37 on the flange 32 side. The retaining ring 38 that also serves as a seal should be in contact with the outer peripheral surface of the chuck cylinder 33. Thereby exerting a sealing function, and by coming into contact with the end surface of the roller holding cylinder 34, the tightening cylinder 37 is prevented from falling off from the chuck cylinder 33.

In FIGS. 3 and 4, reference numeral 40 denotes a collet having a straight outer peripheral surface which is fitted into the chuck cylinder 33 of the holder main body 30 by gripping a cutting tool.
At 0, a plurality of slit portions 41, 42 extending in the axial direction from both end portions 40a, 40b thereof are formed at equal angular intervals in the circumferential direction, and the slit portions 41, 42 are described in the claims. Also serves as a fluid passage. A collar 43 having a diameter larger than that of the collet 40 is formed at the tip of the collet 40, and a male screw portion 44 is formed on the outer peripheral surface of the collar 43.
Are formed.

In FIGS. 3 and 5, 50 is the tip surface 33a of the chuck cylinder 33 and the shank portion Ts of the tool T.
Is a sealing cap that closely adheres to the outer peripheral surface of the workpiece and stops the outflow of coolant and other cutting fluid.
Is provided with a flat plate portion 50a facing the front surface of the collar portion 43 of the collet 40 and a side wall portion 50b facing the outer peripheral surface of the collar portion 43. A through hole 51 through which the shank portion Ts of the cutting tool T penetrates is concentrically formed in the center of the flat plate portion 50a of the sealing cap 50, and the collar portion 43 is formed on the inner peripheral surface of the side wall portion 50b. A female screw portion 52 that is screwed with the male screw portion 44 is formed.

A plurality of fluid ejection nozzles 60 projecting forward from the flat plate portion 50a are provided in a portion of the sealing cap 50 near the outer periphery of the flat plate portion 50a.
It is swingable so that the direction in which cutting fluid such as coolant is jetted can be adjusted. Further, the flat plate portion 50a of the sealing cap 50 is formed with a fluid passage 53 which communicates between each fluid ejection nozzle 60 and the slit portions 41, 42 (fluid passages) of the collet 40.

When the sealing cap 50 is attached to the tip of the collet 40, the chuck cylinder 33 is attached.
In order to ensure air-tightness or liquid-tightness with the front end surface 33a of the chuck cap 33, the end surface 50c of the side wall portion 50b of the sealing cap 50 facing the front end surface 33a of the chuck cylinder 33 is, as shown in FIG. A sealing material 70 such as an O-ring is attached. The sealing material 70 is formed on the tip surface 33 of the chuck cylinder 33.
a and the end surface 5 of the side wall portion 50b of the sealing cap 50
The airtightness or the liquidtightness with 0c is ensured so that the cutting fluid such as coolant does not leak from the gap between the two.
Further, as shown in FIG. 1, the inner peripheral surface of the central through hole 51 of the sealing cap 50, through which the shank portion Ts of the cutting tool T penetrates, secures adhesion with the outer peripheral surface of the tool shank portion Ts. A sealing material 71 such as an O-ring is attached.
The sealing material 71 ensures the airtightness or the liquidtightness between the outer peripheral surface of the shank portion Ts and the inner peripheral surface of the central through hole 51 so that cutting fluid such as coolant does not leak from the gap between the both. .

The side wall portion 5 of the sealing cap 50 is
The height of 0b is larger than the thickness of the collar portion 43 of the collet 40. Further, the sealing cap 50 is formed with a diameter larger than the diameter of the blade portion Tb of the cutting tool T, and the location of the fluid ejection nozzle 60 provided in the sealing cap 50 is located outside the diameter of the blade portion Tb. It is supposed to do. Further, on the inner wall surface of the chuck cylinder 32 of the holder body 30, a groove 56 serving as a cutting fluid supply passage having a plurality of predetermined depths is formed.
By forming the above, it is used as a supply path of cutting fluid supplied from the machine tool side, and the elastic deformation of the chuck cylinder 33 in the diameter reducing direction by the tightening cylinder 37 is further facilitated.

When the cutting tool T is held by the tool holder having the above-mentioned structure according to the present embodiment,
First, the sealing cap 50 is attached to the cutting tool T by inserting the shank portion Ts of the cutting tool T into the central through hole 51 of the sealing cap 50. The collet 40 is fitted into the shank portion Ts of the cutting tool T, and the shank portion Ts of the cutting tool T is inserted into the cylindrical hole of the chuck cylinder 33 together with the collet 40. When the tightening cylinder 37 is rotated in the clockwise direction in such a state, each needle roller 36 that abuts the tapered cylindrical surface of the tightening cylinder 37 rotates about the axis perpendicular to its own axis while rotating around the outer peripheral surface of the chuck cylinder 33. Since the roller holding cylinder 34 revolves in a spiral shape, the roller holding cylinder 34 moves in the direction from the tip end side of the chuck cylinder 33 toward the flange 32 while rotating with the revolution of the needle roller 34, and at the same time, the tightening cylinder 37 also moves toward the flange 3.
Move in direction 2. As a result, the distance between the tapered cylindrical surface of the tightening cylinder 37 and the outer peripheral tapered surface of the chuck cylinder 33 decreases, so that the tightening cylinder 33 moves the chuck cylinder 33 from the outer circumference to the inner circumference direction via the needle rollers 36. The pressure will be forced down from the entire circumference to reduce the diameter. As a result, the chuck cylinder 33
The shank portion Ts of the cutting tool T inserted into the cylindrical hole is clamped and held by the collet 40.

Next, the sealing cap 50 is attached to the collet 4.
Tighten it by screwing it into the collar part 43 of 0. As a result, the end surface 50c of the side wall portion 50b of the sealing cap 50 is brought into close contact with the tip end surface 33a of the chuck cylinder 33 via the sealing material 70, and the airtightness or liquidtightness between the two is ensured, so that the gap therebetween. It is possible to prevent the cutting fluid such as coolant from leaking from the inside. Further, since the inner peripheral surface of the central through hole 51 of the sealing cap 50 is in close contact with the outer peripheral surface of the tool shank portion Ts via the seal material 71, airtightness or liquidtightness therebetween is secured, Cutting fluid such as coolant can be prevented from leaking out from the gap.

Next, the operation of supplying the cutting fluid to the cutting tool T held by the tool holder in the present embodiment will be described. As shown in FIG. 3, the cutting fluid supplied from the machine tool side (not shown) is supplied through the central hole 30a of the holder body 30 to the grooves 56 which are a plurality of fluid supply paths formed on the inner wall surface of the chuck cylinder 33. Collet 4 from this groove 56
Collected in the tip of the collet 40 and the sealing cap 50 via the slit portion 41 of 0, and further the sealing cap 50
Is supplied from each fluid passage 53 to each fluid ejection nozzle 60. Then, the cutting tool T is ejected from each of the fluid ejection nozzles 60.
It is possible to reliably supply the cutting fluid ejected in the blade tip direction along the outer peripheral surface of the cutting tool T to the blade portion Tb and the cutting portion of the workpiece.

When the tightening cylinder 37 in the tightened state is rotated in the counterclockwise direction opposite to the above-described operation, the roller holding cylinder 36 moves to the tip side of the chuck cylinder 33 and the tightening cylinder 37 moves in the same direction. Move to. Therefore, the diameter of the chuck cylinder 33, which has been reduced in diameter, is restored to the original diameter, and the gripping force on the tool T is released. As a result, the tool T can be extracted or replaced.

According to the present embodiment as described above, the grooves 56 are formed on the inner wall surface of the chuck cylinder 33 at predetermined intervals, and the grooves 56 are used as the fluid supply passages, so that the grooves 56 are easily elastically deformed in the diameter reducing direction. Become. Then, the sealing cap 50 is screwed into the tip flange portion 43 of the collet 40 for gripping the cutting tool T inserted into the chuck cylinder 33, and the end surface 50c of the side wall portion 50b of the sealing cap 50 is chucked. Cylinder 33 Tip surface 33
a through the sealing material 70, and the inner peripheral surface of the central through hole 51 of the sealing cap 50 has a sealing material 71.
Since it is in close contact with the outer peripheral surface of the tool shank portion Ts via, the leakage of the cutting fluid can be reliably prevented, and the cutting fluid can be supplied to the tip blade portion and the cutting location of the cutting tool without waste. In addition, the collet 4 does not have to be the collet 40 having a complicated cutting supply path as in the conventional case.
The manufacture of 0 can be provided easily and inexpensively. Further, it is possible to reliably prevent the cutting fluid during machining from entering the needle roller portion from the tip end portion of the tightening cylinder and the dust entering the groove.

Further, according to this embodiment, the installation location of each fluid ejection nozzle 60 on the sealing cap 50 is located outside the diameter of the tool blade portion Tb, and each fluid ejection nozzle 60 is sealed. Since it is swingably provided on the stop cap 50, like a composite burnishing reamer,
Even with the cutting tool T having the blade portion Tb having a diameter larger than the diameter of the tool shank portion Ts, the cutting fluid can be reliably supplied to the blade portion and the cutting portion, and each fluid ejection nozzle 6
The jetting direction of the cutting fluid from 0 can be appropriately adjusted according to the protruding length, diameter, shape of the tip blade portion, rotational speed, etc. of the cutting tool T.

In the above embodiment, the chuck cylinder 3
3 sealing mechanism between the tip surface 33a and the end surface 50c of the side wall portion 50b of the sealing cap 50, and the sealing cap 5
The seal mechanism between the central through hole 51 of 0 and the tool shank portion Ts is not limited to the seal materials 70 and 71 shown in the embodiment,
Labyrinth packing or the like may be used. Further, in the above-mentioned embodiment, the collet 40 is straight, but when the inner wall surface of the chuck cylinder 33 is tapered, it is of course applicable to a tapered collet instead of the straight collet. Is. Further, in the above-mentioned embodiment, the coupling method between the collar portion of the collet 40 and the sealing cap 50 is the screwing method using the female screw and the male screw, but the present invention is not limited to this, and the L-shaped groove is used. It may be a coupling structure by key engagement or the like. Further, in the present invention, the tip surface 3 of the chuck cylinder 33
3a and the end surface 50 of the side wall portion 50b of the sealing cap 50
c and the inner peripheral surface of the central through hole 51 of the sealing cap 50 and the outer peripheral surface of the tool shank portion Ts are highly accurately polished to improve the adhesion, the sealing materials 70, 71 shown in the embodiment.
Can be omitted.

[0033]

As described above, according to the tool holder of the present invention, the collet has the fluid passage which communicates with the fluid supply passage provided in the holder body and guides the fluid from the fluid supply passage to the tip of the collet. A front end surface of the sealing cap is provided detachably provided on the front end portion of the collet, the sealing cap being in close contact with the tip end surface of the chuck cylinder and the outer periphery of the shank portion of the tool to stop the outflow of fluid. A plurality of fluid ejection nozzles are swingably provided near the outer periphery of
Since each of the fluid ejection nozzles and the fluid passage of the collet are configured to be communicated with each other by the fluid passage formed in the sealing cap, it is possible to surely prevent the leakage of the cutting fluid. The liquid can be supplied to the cutting edge of the cutting tool and the cutting location without waste, and the collet can be easily and inexpensively manufactured without the collet having a complicated cutting supply path as in the past. it can.

Further, according to the present invention, the installation location of each fluid ejection nozzle on the sealing cap is located outside the diameter of the tool blade portion, and each fluid ejection nozzle is swung on the sealing cap. Since it is installed so that even if it is a cutting tool that has a blade part with a diameter larger than the diameter of the tool shank part, it is possible to reliably supply the cutting liquid to the blade part and the cutting location, and to eject each fluid. The ejection direction of the cutting fluid from the nozzle can be appropriately adjusted according to the protruding length, diameter, shape of the tip blade portion, rotational speed, etc. of the cutting tool T.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional tool holder provided with a cutting oil supply mechanism.

FIG. 2 is a perspective view of a collet used in a conventional tool holder provided with a cutting oil supply mechanism.

FIG. 3 is a vertical sectional side view of the tool holder according to the embodiment of the present invention.

4 is a cross-sectional plan view taken along line 4-4 of FIG.

FIG. 5 is a bottom view of the sealing cap according to the embodiment of the present invention.

[Explanation of symbols]

30 Tool holder body 31 shank 32 flange 33 chuck tube 33a Tip surface 34 Roller holding cylinder 36 needle roller 37 Tightening tube 40 collets 41,42 Slotting part 43 collar part 44 Male thread 50 Sealing cap 51 Central through hole 51a Flat plate part 51b Side wall 52 Female thread 53 fluid passage 56 groove 60 fluid jet nozzle 70,71 sealing material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, triangular             1-53 Motomachi 1-53, Higashi-Osaka City, Osaka Prefecture Stock             Company Nikken Kosakusho F-term (reference) 3C011 EE06 EE09                 3C032 BB14

Claims (6)

[Claims] 1. A shank portion to be inserted into a spindle of a machine tool is provided at one end, and the shank portion is provided at the other end so as to extend in line with the axis of the shank portion, and the diameter of the shank portion becomes smaller toward the tip end on the outer peripheral surface. A holder main body having a chuck cylinder with a tapered surface formed thereon, a tightening cylinder for tightening the chuck cylinder from the outer peripheral surface side, and a collet that is fitted to the chuck cylinder and holds a shank portion of a tool, A tool holder for removably gripping the tool by reducing or restoring the diameter of the chuck cylinder with a tightening cylinder, wherein the tool is communicated with a fluid supply passage provided in the holder body, and the fluid from the fluid supply passage is connected to the collet. A fluid passage that leads to the tip is provided in the collet, and a sealing cap that adheres to the tip surface of the chuck cylinder and the outer periphery of the shank portion of the tool to stop the outflow of fluid is attached to the tip of the collet. A plurality of fluid ejection nozzles are swingably provided near the outer periphery of the front end surface of the sealing cap, and the sealing is provided between each fluid ejection nozzle and the fluid passage of the collet. A tool holder characterized in that they are communicated with each other by a fluid passage formed in a cap for use. 2. The tool has a blade portion having a diameter larger than a diameter of the tool shank portion, and the sealing cap has a diameter larger than a diameter of the blade portion, and is provided on the sealing cap. The tool holder according to claim 1, wherein the location of the fluid ejection nozzle is located outside the diameter of the blade portion. 3. A tip portion of the collet has a collar portion having a diameter larger than that of the collet, and a male screw portion is formed on an outer peripheral surface of the collar portion, and an inner peripheral surface of a side wall portion of the sealing cap is formed. 3. A tool holder according to claim 1, wherein a female thread portion is formed, and the sealing cap is mounted on the tip portion of the shank portion by screwing the female thread portion onto the male thread portion. . 4. The tool according to claim 1, wherein a sealing material is interposed between the surfaces of the chuck cylinder and the sealing cap that are in close contact with each other. holder. 5. A sealing material is interposed between the inner peripheral surface of the central through hole of the sealing cap and the outer peripheral surface of the tool shank portion, through which the shank portion of the tool penetrates. The tool holder according to any one of claims 1 to 4, which is characterized. 6. The collet, to which the shank portion of the tool is fitted and held, is inserted into the chuck cylinder, the chuck cylinder is tightened with the tightening cylinder, and the sealing cap is attached to the tip of the collet. The tool holder with the fluid passage according to claim 1, wherein the tool holder is mounted.