JPH0639346U - Fluid supply device for tool holder - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a tool holder fluid supply device capable of cooling a plurality of front and rear portions of a portion of a tool 28 projecting forward of a holder body 1 from inside and outside a hole of a workpiece. . [Structure] A holder body 1 mounted on a rotating shaft 31 is rotatably fitted with a non-rotating holder case 6 mounted on a non-rotating member 33 arranged on the outer peripheral side of the rotating shaft 31, and a cutting fluid is supplied from the non-rotating member 33 side. A fluid passage 17 formed inside the holder case 6 and the holder body 1 sends the cutting fluid to an external nozzle 19 provided on an outer peripheral portion of the holder case 6, and the cutting fluid is supplied from a front end of the external nozzle 19 projecting forward of the holder case 1 to the holder body 1. Tool 2 fitted in the tool mounting hole 5
The cutting fluid is supplied from the fluid passage 17 to the rear end portion 5a of the tool mounting hole 5 while being supplied to the blade portion 28b of No. 8 and is discharged from the front end portion of the tool 28 via the fluid supply hole 30 of the tool 28.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is provided in a tool holder that is attached to a rotary shaft such as a main shaft provided in a numerically controlled machine tool such as a machining center, and a fluid such as cutting fluid is projected from the tool holder and a front portion of the tool holder. The present invention relates to a fluid supply device that supplies a workpiece to a processing part by a blade.

[0002]

[Prior art]

 Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 10276/1992, a holder main body is detachably attached to a rotary shaft such as a main shaft of a machine tool, and a tool is provided on a front portion of the holder main body that projects forward from the rotary shaft. A tool in which the holder body is rotatably fitted and held in a holder case that is provided with mounting holes and is non-rotatingly engaged with and held by a non-rotating member such as a spindle head provided on the outer peripheral side of the rotating shaft of the machine tool. There was a holder.

Further, as a fluid supply device for the tool holder, a fluid such as cutting fluid is pressure-fed from the non-rotating member side to a fluid passage hole formed inside the holder case, and the fluid is attached from the front end of the holder case to the attachment. In some cases, a tool such as a drill fitted and fixed in a hole is supplied to the outer periphery of the front portion of the tool, which projects from the tool body, to cool the front portion such as the blade portion of the tool.

Further, a fluid supply hole is formed in a tool such as a drill or an end mill, and the chuck portion of the tool is held in a tool mounting hole provided in a tool holder directly or via a chuck such as a collet chuck, Cutting fluid is pumped from the outside to the rear end of the mounting hole, and the cutting fluid is discharged from the front end of the tool through the fluid supply hole, so that the front end of the tool and the workpiece machining part Some even cooled the inside of the hole.

[0005]

In the conventional fluid supply device provided in the tool holder, a fluid such as cutting fluid is discharged from the front end of the fluid passage hole formed in the holder case, so that the workpiece is machined. If the hole is long, it will not be possible for the cutting fluid to reach the back of the hole because it is blocked by the rear end surface of the workpiece, and if the shank of a small-diameter tool is held through the chuck. , The cutting liquid cannot be supplied to the position close to the shank part of the tool because it is blocked by this shank part, and in order to solve this, it is necessary to make the holder case a large outer diameter or extend it forward. There was a problem that the holder case became large.

On the other hand, in the conventional tool in which the fluid supply hole is formed, only the cutting fluid is discharged from the front end portion of the tool into the hole of the workpiece, so that the hole for machining the workpiece is In the case of a long hole, there was a problem that the part near the rear end of this hole could not be cooled sufficiently.

This invention solves the above-mentioned problems, and the front and rear direction of the processing part by the front part of the tool and its blade part without increasing the size of the holder case and the troublesome attachment and detachment of the tool. It is an object of the present invention to provide a fluid supply device for a tool holder capable of discharging a fluid such as cutting fluid from inside and outside to a plurality of places and cooling it sufficiently even if the length of the hole is long.

[0008]

[Means for Solving the Problems]

 This invention is a fluid supply device for a tool holder as described above, comprising a holder body detachably mounted on a rotary shaft of a machine tool, and a front portion of the holder body protruding forward of the rotary shaft. A tool holder fluid in which the holder body is rotatably fitted and held in a holder case that is provided with a tool mounting hole on the outer peripheral side of the rotating shaft of the machine tool and is held non-rotatably by a non-rotating member. An external nozzle is provided on an outer peripheral portion of the holder case, and a front end of the external nozzle that supplies fluid toward the front center side of the holder case projects toward the front of the holder case. A fluid passage for sending a fluid to the inside is formed inside the holder case and the holder body, and a rear end portion of the tool mounting hole is communicated with the fluid passage.

[0009]

[Action]

 The tool holder fluid supply device according to the present invention is configured such that a fluid such as cutting fluid is supplied from the non-rotating member side such as a spindle head of a machine tool to the inside of the holder case and the holder body to an external nozzle provided on the outer peripheral portion of the holder case. By sending it through the formed fluid passage, it can be discharged from the front end of the external nozzle toward the front center side of the holder main body, and can be supplied to the front outer periphery protruding forward from the holder main body or chuck of the tool. By connecting the front end of the tool mounting hole provided in the holder body to the fluid passage, fluid such as cutting fluid is sent from the fluid passage to the rear end of the tool mounting hole, and the rear end is used for tool mounting. The front end of the tool that sends fluid to the fluid supply hole of the tool installed directly in the hole or through the chuck, or through the channel in the chuck, and opens this fluid in the fluid supply hole. It can direct fluid to by al released within the pores of the workpiece that is processed by the front end. Therefore, fluid such as cutting fluid can be supplied from inside and outside the hole of the workpiece to multiple points in the length direction of the front part protruding from the tool holder body or chuck, and the length of the hole of the workpiece or the front part of the tool can be supplied. Even when the tool is long, the front part of the tool and the part to be machined by the front part can be sufficiently cooled.

Further, since the front end of the external nozzle is projected to the front of the holder case, even if the holder main body or the chuck projects forward from the front end of the case, the front end near the main body of the tool or the chuck is A fluid such as cutting fluid can be supplied accurately, and unlike the conventional holder case, it is not necessary to extend the case to cover the case body and the chuck to increase the size, and the tool can be easily attached and detached.

[0011]

【Example】

 A first embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. 1 and 2, reference numeral 1 denotes a holder main body of a tool holder. The holder main body 1 is provided with a grip portion 3 for automatic tool change in front of a tapered shank portion 2 and a front portion 4 in front of the grip portion 3. A tool mounting hole 5 is formed in the front surface of the holder body 1, and the front end of the tool mounting hole 5 is opened in the front end surface of the holder body 1. The holder case 6 of the tool holder is rotatably fitted and held in the front part 4 of the holder body 1 via front and rear belly rings 7, and the holder case 6 is restrained in the front-rear direction with respect to the holder body 1. The front end is arranged rearward of the front end of the holder body 1.

A hole 6a penetrating the case 6 in the front-rear direction is formed in the lower part of the holder case 6, and a guide cylinder 8 is inserted into the hole 6a, and the guide cylinder 8 is fitted with a spring holder. Since the holder 9 is fixed to the holder case 6, the holder 9 is fixed to the case 6.

As shown in FIG. 3, a clutch member 10 is arranged at the rear part of the holder case 6, and the lower part of the clutch member 10 is fitted to the rear part of the guide cylinder 8 so as to be movable in the front-rear direction. The outer end of the outer casing 8 is loosely fitted to the outer periphery of the outer casing 8 and its front end is biased rearward by an outer spring 11 supported by the holder case 6. Further, the clutch member 10 has a plate-shaped upper portion 10a supported on the front surface of the grip portion 3 of the holder main body 1, and a positioning pin 12 protruding rearward of the holder case 5 is positioned on the plate-shaped upper portion 10a. The hole 10b is fitted. Further, the clutch member 10 is configured such that the clutch pin 13 is engaged with the notch 10c provided in the plate-shaped upper portion 10a, and the clutch pin 13 is provided between the front surface of the grip portion 3 and the rear surface of the holder case 6. It is fixed to the mounting ring 14 which is arranged in the holder body 1 and fitted and fixed to the holder body 1. In addition, in FIG. 1, 15 is a ring fixing screw.

A rear end of the guide cylinder 8 projects rearward of the clutch member 10, and a fluid passage 17 having an introduction hole 8 a provided at a rear end surface of the guide cylinder 8 as an upstream end has a guide cylinder 8, a holder case 6 and The fluid passage 17 is formed inside the holder main body 1, and is configured to connect a positioning block 18 on the machine tool side, which will be described later, and an external nozzle 19 held on the outer peripheral portion of the holder case 6. .

That is, a ball valve 16 that opens and closes the introduction hole 8 a and an inner spring 20 that urges the valve 16 in the closing direction are provided in the guide cylinder 8, and the fluid passage 17 is connected to the guide cylinder 8. It is connected to a communication hole 21 arranged near the front end of the intermediate portion of the guide cylinder 8 via the spring receiver 9, and an upstream passage 22 in the holder case 6 is connected to the communication hole 21. Is connected to the annular passage 23 formed between the inner peripheral surface of the holder case 6 and the outer peripheral surface of the holder body 1 at the rear of the tool mounting hole 5 of the holder body 1, and the annular passage 23 is connected to the holder case 6. Three lower circulation passages 24 formed at an angular interval of 120 ° are connected to each other, and the downstream passage 24 has three nozzle pipes 25 provided in the outer nozzle 19 and a long hole 25a extending in the front-rear direction in the nozzle pipe 25. Each connected to There.

The nozzle pipes 25 are respectively arranged at positions corresponding to the downstream passages 24, extend in the front-back direction of the holder case 6, are supported movably in this direction, and are clamped by screws in the holder case 6. It is fixed at a required position by 27. A spherical nozzle 26 is rotatably held in the front end opening of the nozzle pipe 25.

The external nozzle 19 is arranged such that the spherical nozzle 26 projects forward from the front end of the holder case 25 even when the nozzle pipe 25 is located at the rear end. Is slightly projected outward from the outer peripheral surface of the holder case 6, and the rear end is closed. Further, in the external nozzle 19, the spherical nozzle 26 is rotatably held on the nozzle pipe 25 by a retaining nut 38 screwed onto the front end portion of the nozzle pipe 25, and the external nozzle 19 is slanted from the injection passage 26a to the holder body 1 at a required angle. A fluid such as cutting fluid is ejected toward the front center side.

Further, the fluid passage 17 is provided with an internal passage 39 that branches from the annular passage 23 and communicates with the rear end portion 5 a of the tool mounting hole 5, and the internal passage 39 is formed in the holder body 1. There is. Then, the shank 28a of the tool 28 formed of an end mill is fitted into the tool mounting hole 5, and the shank 28a is attached to the holder body 1 by the clamp bolt 29 screwed into the front end portion of the holder body 1 projecting forward of the holder case 6. Removably retained in. In this state, a space is formed in the rear end portion 5a between the rear end surface of the shank 28a of the tool 28 and the opening of the internal passage 39 of the tool mounting hole 5, and the shank 28a of the fluid supply hole 30 formed in the tool 28 is formed. The inlet 30a opening to the rear end face is communicated with the rear end 5a, and the front end 30b of the fluid supply hole 30 is bifurcated into a front portion of the tool 28, that is, a blade portion 28b protruding forward of the holder body 1. An injection port 30c is opened at the front end. In addition, at the rear end portion of the tapered shank portion 2 of the holder main body 1, a plstat bolt (not shown in FIG. 1) is projected.

In FIG. 1, reference numeral 31 is a rotary shaft such as a main shaft installed in a numerical control type machine tool such as a machining center. A taper hole 32 is formed at the front end of the rotary shaft 31, and the rotary shaft 31 is fitted into the rotary shaft 31. The positioning block 18 is fixed to the lower portion of the front end surface of the non-rotating member 33 formed of a quill such as the inserted spindle head. The rear chamber 34 inside the block 18 communicates with a fluid supply source (not shown) provided at a proper position outside the block 18 through a flow path having a flexible hose 35, and communicates with the rear chamber 34. A push rod 37 fixed to the rear chamber 34 is projected into the shaped positioning portion 36.

Next, the operation of the fluid supply device for the tool holder according to the first embodiment having the above-described configuration will be described. The shank 28a of the tool 28 is fitted and held in advance in the tool mounting hole 5 provided in the holder body 1 of the tool holder. In this state, the grip part 3 provided on the holder body 1 is gripped by the automatic tool changer (not shown) provided on the machine tool, and the taper shank portion 2 of the holder body 1 is installed on the rotary shaft 31 of the machine tool. The tool holder is set in the position shown by the solid line in FIG. At this position, the rear end of the positioning guide tube 8 provided in the holder case 6 of the tool holder is fitted into the positioning portion 36 of the positioning block 18 of the non-rotating member 33 of the machine tool.

Next, the automatic attachment / detachment mechanism (not shown) provided in the inner part of the taper hole 32 of the rotary shaft 31 and the automatic tool changer are operated by the controller, so that the holder main body 1 can be operated by the automatic attachment / detachment mechanism. Hold the pull-stat bolt provided on the tapered shank portion 2 of the holder shank 2, and pull the shank portion 2 into the tapered hole 32 of the rotary shaft 31 to a predetermined position as shown by the chain line in FIG. Further, the guide cylinder 8 is pulled up to the position indicated by the chain line in FIG.

When the guide cylinder 8 is pulled in as described above, the ball valve 16 in the guide cylinder 8 is pressed against the push rod 37 fixed to the positioning block 18. Therefore, the ball valve 16 moves forward and opens against the spring force of the inner spring 20, and the rear chamber 34 of the positioning block 18 and the introduction hole 8a provided in the rear end surface of the guide cylinder 8, that is, the fluid passage 17 are provided. Communicates with the upstream end of. At the same time, the clutch member 10 is pressed against the front end surface of the block 18, moves forward against the spring force of the outer spring 11, and the notch portion 10c provided in the plate-shaped upper portion 10a of the clutch member 10 and the holder body 1 are provided. The holder pin 6 is disengaged from the clutch pin 13 fixed to the holder case 6 via the ring 14, and the holder body 1 is freely rotatable with respect to the holder case 6.

In this state, the rotary shaft 31 is driven to rotate the holder body 1 and the tool 28 integrally. At this time, the holder case 6 does not rotate because the rear end of the guide tube 8 is engaged and held by the positioning portion 36 of the positioning block 18. Subsequently, the cutting fluid is pumped into the rear chamber 34 of the positioning block 18 via a valve (not shown) provided in the flow path connecting the positioning block 18 and the fluid supply source.

The cutting fluid pumped into the rear chamber 34 is sent from the introduction hole 8 a provided at the rear end surface of the guide cylinder 8 to the inside of the guide cylinder 8 of the fluid passage 17, and the communication hole 21 and the holder case 6 After passing through the upstream passage 21, the annular passage 23, and the downstream passage 24, they are fed into the pipes 25 through the long holes 25a of the nozzle pipes 25 provided in the three external nozzles 19, respectively, and are provided at the front end openings thereof. It is jetted from the jet passage 26a of the spherical nozzle 26 toward the center of the holder body 1 in the diagonally forward direction.

At the same time, the cutting fluid is attached to the inner passage 27 formed in the holder body 1 from the annular passage 23 of the fluid passage 17 and the tool mounting portion located at the front portion 4 protruding forward of the rotation shaft 31 of the holder body 1. It is sent to the fluid supply hole 30 of the tool 28 through the rear end 5a of the working hole 5, and is jetted to the outer peripheral side of the tool 28 obliquely from the injection port 30c opened at the front end of the blade 28b which is the front of the tool 28. Let

In the above-mentioned state, the rotary shaft 31 and the tool holder are advanced together with the non-rotating member 33 of the machine tool, and the blade portion 28b of the tool 28 is pushed into the prepared hole of the workpiece to perform cutting work, The cutting liquid jetted from the front end portion of 28b cools the front end portion of the blade portion 28b and the processed portion of the workpiece, and the cutting liquid jets from the spherical nozzle 26 provided at the front end portion of the nozzle pipe 25 of the external nozzle 19. Cool the front and rear positions of 28b and the back of the work piece.

After the machining of the workpiece is completed, the rotary shaft 31 and the tool holder are retracted together with the non-rotating member 33, the blade portion 28b of the tool 28 is extracted from the workpiece, and the non-rotating member 33 is returned to the original position. Then, the rotation of the rotary shaft 31 is stopped, and the supply of the cutting fluid from the fluid supply source to the rear chamber 34 of the positioning block 18 is also stopped.

The rotating shaft 31 is stopped at a position where the clutch pin 13 fixed to the holder body 1 via the mounting ring 14 and the notch 10c of the clutch member 10 provided in the holder case 6 face each other, and 1 is restrained from rotating with respect to the holder case 6, the grip part 3 is grasped by the automatic tool changer, the taper shank part 2 of the holder body 1 is pulled out from the taper hole 32 of the rotating shaft 31, and the positioning provided on the holder case 6 is performed. The guide cylinder 8 is pulled out from the positioning block 18, and the tool holder is returned to a predetermined position outside the rotary shaft 31 and the positioning block 18. Hereinafter, the above-mentioned operation is performed on different workpieces.

In this embodiment, the nozzle pipe 25 is moved forward within the range of the length dimension 1 in which the long hole 25a provided in the nozzle pipe 25 of the external nozzle 19 communicates with the downstream passage 24 of the fluid passage 21. And by rolling the spherical nozzle 26 and changing the inclination angle of these jet passages 26a with respect to the axial direction of the tool 28, the cutting fluid jetted from the jet passage 26a to the proper position of the blade portion 28b of the tool 28 can be adjusted. It can be reliably supplied. Since the three external nozzles 19 can be positioned in the front-rear direction independently of each other, the holder case of the tool 28 can be obtained by making the front-rear position of the spherical nozzle 26 and the inclination angle of the injection passage 26a different from each other. 6 Efficiently cool the entire blade portion 28b from the outer peripheral side or remove cutting scraps adhering to the blade portion 28b according to changes in the length and outer diameter of the front portion protruding forward, that is, the blade portion 28b. It is possible to improve the performance without extending the holder case 6 forward and making it large.

Furthermore, since the spherical nozzle 26 can be rolled to close the tip opening of the nozzle pipe 25, some or all of the external nozzles 19 such as the tool 28 having a short blade 28 b can be used. Of the cutting fluid can be stopped, and if the shank of a tool without a fluid supply hole is fitted and fixed in the tool mounting hole 5 of the holder body 1, the ejection of cutting fluid from the front end of the tool can be eliminated. It can be done easily.

The nozzle pipe 25 can be moved in the front-back direction by loosening the clamp screw 27 and tightening the screw 27 after the movement. The rolling of the spherical nozzle 26 can be suppressed and the nut 38 can be loosened. These operations are simple because it is sufficient to tighten the holding nut 38 after the movement.

FIG. 4 shows a second embodiment of the present invention. In FIG. 4, the same symbols as those in FIGS. 1, 2 and 3 are corresponding parts. In the second embodiment, the upstream passage 22 provided in the holder case 6 of the fluid passage 17 is connected to the rear end portion 5a of the tool mounting hole 5 in the holder body 1 by the connecting passage 41 extending in the radial direction of the holder body 1. The rear end portion 5a is communicated with the outer periphery, and the rear end portion 5a serves as a part of the fluid passage 17 and is circumferentially separated from the connection passage 41 on the outer periphery of the rear end portion 5a. And 43 are formed.

Further, in the second embodiment, a collet chuck 44 is provided at the front end of the holder body 1, and a shank 46 a of a tool 46 made of a drill is detachably fitted and fixed to the collet 45 of the chuck 44. A sleeve 47 provided behind the collet 45 of the chuck 44 is fitted and fixed in the front part of the tool mounting hole 5, and a fluid supply passage 48 formed in the tool 46 is connected to the sleeve 47 and the collet 45. It is communicated with the rear end portion 5a of the tool mounting hole 5 through a chuck inner flow path 50 formed in a support cylinder 49 which is provided between the two and supports the rear end of the shank 46a of the tool 46. Then, the cutting fluid is sent from the rear end portion 5a of the tool mounting hole 5 to the fluid supply hole 48 of the tool 46 through the chuck internal flow path 50 and is opened at the front end portion of the blade portion 46b which is the front portion of the tool 46. It is designed to be ejected from the ejection port 48c.

The configuration, operation, and action of the second embodiment other than those described above are almost the same as those of the first embodiment. Further, in the second embodiment, the tool is mounted in the tool mounting hole of the holder main body through the collet chuck, but in the present invention, instead of the collet chuck, a needle type milling chuck holds the shank of the tool to perform milling. The tool may be attached to the tool mounting hole of the holder body via the chuck.

In this invention, as the tool, in addition to the end mill and the drill, a reamer, a boring bar, a tap, and the like can be used. These may or may not be provided with a fluid supply hole, and the fluid can be cut. In addition to the liquid, high pressure water or cooling air may be used.

Further, in the present invention, the means for fixing the nozzle pipe and the spherical nozzle of the external nozzle may use an appropriate member other than the clamp screw and the retaining nut, and the number of external nozzles is limited to three. However, the external nozzles may be fixed to the holder case as long as the front end projects from the front end of the holder case.In this case, the front ends of the multiple external nozzles may be arranged in different positions in the front-back direction. preferable.

[0037]

[Effect of device]

 As described above, the present invention has a holder main body that is detachably attached to a rotary shaft of a machine tool, and a tool mounting hole is provided in a front portion of the holder main body that projects forward of the rotary shaft. A fluid supply device for a tool holder, wherein the holder main body is rotatably fitted and held in a holder case that is non-rotatably held by a non-rotating member provided on the outer peripheral side of a rotating shaft of a machine. An external nozzle is provided on the outer peripheral part of the case, and a front end for supplying fluid toward the front center side of the external nozzle is projected toward the front of the holder case, and a fluid passage for sending fluid from the non-rotating member side to the external nozzle is described above. Since it is formed inside the holder case and the holder body and the rear end of the tool mounting hole is communicated with the fluid passage, the following effects can be obtained.

That is, in the tool holder fluid supply device according to the present invention, a fluid such as a cutting fluid is supplied from the non-rotating member side such as the spindle head of the machine tool to the external nozzle provided on the outer peripheral portion of the holder case. And through the fluid passage formed inside the holder body, it is discharged from the front end of the external nozzle toward the front center side of the holder body, and to the front outer periphery protruding forward from the tool holder body and chuck. In addition to being able to supply, fluid such as cutting fluid is sent from the fluid passage to the rear end of the tool mounting hole by connecting the front end of the tool mounting hole provided in the holder body to the fluid passage. From the part to the tool mounting hole directly or through the chuck to the fluid supply hole of the tool, or directly through the flow path inside the chuck, and feed this fluid to the fluid supply hole. The fluid can be discharged from the front end of the tool, which is opened, to guide the fluid into the hole of the workpiece being machined. Therefore, a fluid such as cutting fluid can be supplied from inside and outside the hole of the workpiece to multiple points in the length direction of the front portion protruding from the tool holder body or the chuck, and the length of the hole of the workpiece or the front portion of the tool can be increased. Even with long lengths, the front part of the tool and the part to be machined by the front part can be sufficiently cooled.

Further, since the front end of the external nozzle is projected to the front of the holder case, even if the holder main body or the chuck is projected forward from the front end of this case, the front end near the main body of the tool or the chuck is A fluid such as cutting fluid can be supplied accurately, and unlike the conventional holder case, it is not necessary to extend the case to cover the case body and the chuck to increase the size, and the tool can be easily attached and detached.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a fluid supply device for a tool holder according to a first embodiment of the present invention.

FIG. 2 is a front view showing a fluid supply device of the tool holder shown in FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a longitudinal sectional view showing a fluid supply device for a tool holder according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Tool holder holder body 2 Tapered shank portion 3 Grip portion 4 Front portion of holder body 5 Tool mounting hole 5a Rear end portion 6 Holder case 8 Guide tube 9 Spring receiver 10 Clutch member 10b Positioning hole 10c Cutout portion 11 Outer spring 12 Positioning pin 13 Clutch pin 16 Ball valve 17 Fluid passage 18 Positioning block 19 External nozzle 20 Inner spring 23 Annular passage 25 Nozzle pipe 26 Spherical nozzle 26a Injection passage 27 Clamp screw 28 Tool 28a Shank 28b Blade (front) 30 Fluid supply hole 31 rotating shaft 32 taper hole 33 non-rotating member 34 rear chamber 36 positioning portion 37 push rod 38 retaining nut 39 internal passage 44 collet chuck 46 tool 47 sleeve 48 fluid supply hole 50 chuck internal flow passage

Claims (4)

[Scope of utility model registration request] 1. A rotary shaft of a machine tool, comprising a holder body detachably mounted on the rotary shaft of the machine tool, and a tool mounting hole is provided in a front portion of the holder main body that projects forward of the rotary shaft. A fluid supply device for a tool holder in which the holder main body is rotatably fitted and held in a holder case that is non-rotatably engaged and held by a non-rotating member provided on the side of the holder case. With a nozzle,
A front end that supplies fluid toward the front center side of the external nozzle is projected toward the front of the holder case, and a fluid passage that sends fluid from the non-rotating member side to the external nozzle is formed inside the holder case and the holder main body. A fluid supply device for a tool holder, wherein a rear end portion of the tool mounting hole communicates with the fluid passage. 2. A plurality of external nozzles are provided on the outer circumference of the holder case with the positions thereof being different from each other in the circumferential direction of the holder case and the positions of the front ends being different from each other in the front-back direction. A fluid supply device for the tool holder described. 3. A plurality of external nozzles are arranged at positions different from each other in the circumferential direction of the holder case, and are held in the holder case so as to be movable in the front-back direction, respectively. Fluid supply device for tool holder. 4. The tool mounting hole of the holder body holds the rear portion of the tool directly or via a chuck, and connects the fluid passage to the rear end portion located rearward of the rear end of the tool. The fluid supply device for a tool holder according to claim 1, 2, or 3.