JPH04176538A - machine tool tool holder - Google Patents

Abstract

PURPOSE:To form a liquid film in the size of the necessary minimum limit in accordance with a tool, by having the function which forms a cylindrical or conical liquid film covering the tool under working on a tool holder itself. CONSTITUTION:A liquid path 14 is formed in continuation along a center shaft at a pull stud 2, tool holder main body 1 and chuck 5. A through hole 17 is formed from the liquid path 14, the tip thereof is connected to a chamber 18. Moreover plural through holes 19 are formed at equal intervals at the chuck 5. One part of the cutting liquid fed to the liquid path 14 is fed to the plural through holes 19 after being fed to the chamber 18 and the cutting liquid is injected from the terminal open part of the through hole 19, Also, the tip of a cylindrical part 23 forms a gap 25 in the space with the outer peripheral edge of a flange 22. At the terminal open part of the through hole 19 the pressure rise part by a centrifugal force is injected with its addition to the feeding pressure fed from the liquid path 14, and the cutting liquid arrives at the internal wall of the cylindrical part 23. The arrived cutting liquid falls downward by passing through the gap 25.

Description

[Detailed description of the invention] (Industrial application field) The present invention is used for machine tools such as machining centers,
The present invention relates to a tool holder for a machine tool that can prevent dust generated during machining from scattering by forming a cylindrical or conical liquid film on the outer periphery of the tool.

(Prior Art) Graphite, which is used as an electrode material, generates fine dust when it is cut, which has the problem of contaminating the surrounding environment and adversely affecting the health of workers.

Therefore, in order to solve these problems, a machine tool for machining graphite has been proposed, as described in Japanese Patent Application Laid-Open No. 62-74546 and in Japanese Utility Model Application Publication No. 64-56940 by the present applicant.

All of these have a nozzle consisting of a ring-shaped slit installed in a spindle head that pivotally supports a spindle to which a processing tool is attached. These devices eject machining fluid or cleaning fluid downward to form a curtain-like cylindrical or conical liquid film. This liquid film can isolate the space around the processed part from the outside world, and can prevent dust generated during processing from being absorbed into the liquid film and scattered around.

(Problem to be Solved by the Invention) However, in the above-mentioned machine tools, the nozzle for forming a liquid film is installed in the spindle head around the spindle, so the outer diameter of the curtain-shaped liquid film that is formed exceeds a certain level. Therefore, if the outer diameter of the tool is small, there is a problem that the diameter becomes unnecessarily large.

Furthermore, in processing while forming a liquid film, the liquid that has fallen as a liquid film is collected, so it is necessary to prevent the liquid film from coming off the edge of the table.

Therefore, the relative movement range between the tool and the table is narrowed, and the processing range is restricted.

The present invention has been made to solve the above problems, and its purpose is to make the curtain-like liquid film a size that corresponds to the outside diameter of the tool, and to limit the range that can be processed. An object of the present invention is to provide a tool holder for a machine tool provided with a nozzle for forming a liquid film so that the amount of liquid film formation can be minimized.

(Means for Solving the Problems) In order to achieve the above object, a first invention provides a ring body rotatable relative to a tool holder and pivotally supported on the outer periphery of a tool holder main body, and a ring body rotatable relative to a tool holder. A locking means is formed on the body and engages with the spindle head side to prevent rotation of the ring body, and a locking means is formed in a ring shape at the lower end of the outer periphery of the ring body and allows the supplied liquid to flow downward to form a cylindrical or A slit-shaped nozzle that creates a conical liquid film, an inlet formed in the tool holder body that introduces the liquid supplied from the spindle side into the spindle body, and the opposing part between the tool holder body and the ring body. , a liquid supply means for supplying the liquid supplied to the injection port to the slit-shaped nozzle portion.

A second invention is the first invention, characterized in that the liquid supplied from the spindle side to the injection port is cutting oil, and a part of the liquid is supplied to the cutting oil supply hole at the upper end of the tool held by the tool holder. .

The third invention includes a ring body pivotally supported on the outer periphery of the tool holder body via a bearing, and a ring body formed on the ring body that engages with the spindle head side to prevent rotation of the ring body and from the spindle head side. An inlet for introducing the supplied liquid into the ring body, and a slit-shaped nozzle formed in a ring shape at the lower end of the outer periphery of the ring body and spouting the supplied liquid downward to create a cylindrical or conical liquid film. , a liquid supply path formed in a ring body and for supplying the supply liquid supplied to the injection port to the slit-shaped nozzle portion.

A fourth invention is based on the third invention, and includes a compressed air inlet formed in the tool holder main body and for introducing compressed air supplied from the spindle side into the spindle main body; It is characterized by comprising a compressed air supply path that supplies compressed air to the opposing surface between the outer periphery of the tool holder main body and the ring body, and to the bearing section.

A fifth invention is a tool holder for a machine tool according to the third invention or the fourth invention, in which a nozzle is provided inside the slit-shaped nozzle formed in the ring body for injecting the supply liquid to the outer periphery of the tool. It is characterized by

A sixth invention is the tool holder for a machine tool according to the fourth invention, characterized in that an air nozzle is formed at the lower end of the outer periphery of the tool holder main body for jetting compressed air to the tool section below.

(Function) In the first invention, the ring body is pivotally supported on the outer peripheral portion of the tool holder main body so as to be able to freely rotate relative to the ring body. This ring body is formed with a locking means, and when the tool holder body rotates together with the spindle, the locking means engages with the spindle head side and prevents rotation of the ring body.

Also, when liquid is supplied from the spindle side to the injection port formed in the tool holder body, the liquid is supplied to the slit-shaped nozzle part of the ring body side by the liquid supply means through the opposed part between the tool holder body side and the ring body. supplied to

A slit-shaped nozzle formed at the lower end of the outer circumference of the ring body causes the supplied liquid to flow downward to form a cylindrical or conical liquid film.

20 The liquid film covers the area around the tool being processed and blocks it from the outside space.

In the second invention, cutting oil is supplied from the spindle side to the inlet, a part of which is supplied to the cutting oil supply hole at the upper end of the tool held by the tool holder, and cutting oil is supplied to the machining part of the tool. be done.

In the third invention, the ring body is pivotally supported on the outer peripheral portion of the tool holder main body via a bearing. Due to the injection port formed in the ring body, when the tool boulder body rotates together with the spindle, the locking means engages with the spindle head side to prevent rotation of the ring body. At the same time, when liquid is supplied to the injection port from the spindle head side, the liquid is supplied to the slit-shaped nozzle portion of the ring body through the liquid supply path.

A slit-shaped nozzle formed at the lower end of the outer circumference of the ring body jets the supplied liquid downward to form a cylindrical or conical liquid film.

This liquid film covers the periphery of the tool being processed and blocks it from outside space.

In the fourth invention, when compressed air is supplied from the spindle side to the compressed air inlet formed in the tool holder main body, the opposing surface between the outer periphery of the tool holder main body and the ring body and the bearing compressed air is supplied to the The supplied compressed air is blown out from the opposing surface and the bearing section, thereby preventing liquids used during machining from entering the opposing surface and the bearing section.

In the fifth invention, the supply liquid is injected onto the outer circumference of the tool from the nozzle provided inside the slit-like nozzle formed in the ring body.

In the sixth invention, compressed air is ejected from the air nozzle formed at the lower end of the outer periphery of the tool holder main body to the tool section below to remove chips and the like generated during machining.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially broken sectional view of a first embodiment according to the first and second inventions.

In the figure, a pull stand 2 is fixed to the upper end of the tool holder main body 1 with a screw, and when the pull stud 2 is pulled upward by an engaging member (not shown),
The spindle 3 is pressed against the tapered surface and fixed. Furthermore, a nose key (not shown) fits into a key groove 4 formed in the tool holder body 1, thereby ensuring power transmission to the spindle 3 side.

A chunk portion 5 is coaxially fixed to the lower part of the tool holder body 1 with a screw. The lower part of the chuck part 5 is attached to the tool T through a sleeve 6 to grip the tool T, and is further tightened by tightening a ring 7.

A ring 9 is pivotally supported on the outer periphery of the tool holder main body 1 above the chuck portion 5 via bearings 8 . The bearing 8 is fixed to the tool holder main body 1 by tightening a holding nut 12 through a spacer 11.

A protrusion 9a is provided at the upper end of the outer periphery of the ring 9, and by engaging with a retaining part 13 on the spindle head side (not shown), the tool holder main body 1 can be rotated together with the spindle 3 when it is rotationally driven. It stays in place without any problems.

Further, a liquid path 14 consisting of a through hole is continuously formed in the pull stud 2, the tool holder body 1, and the chuck portion 5 along the central axis. The upper opening of the pull stud 2, which is the upper end of the fluid path 14, serves as an inlet for cutting fluid. When cutting fluid is supplied from the spindle 3 side to the fluid path 14 of the brewster 7D 2, it is sent downward through the fluid path 14 formed in the tool holder body 1 and the chunk portion 5. The cutting fluid sent to the lower end of the fluid path 14 is supplied to the processing surface through a space 15 formed in the upper part of the tool T and a cutting fluid supply path 16 inside the tool T.

On the other hand, a through hole 17 is formed radially from the liquid path 14 near the lower end of the tool holder body 1, and the tip thereof is connected to a chamber 18.
connected to. The chamber 18 is formed in a ring shape between the outer circumference of the lower end of the tool holder body 1 and the chuck portion 5. Further, a plurality of through holes 19 are formed at equal intervals in the chuck portion 5 forming the outer surface of the chamber 18. The through hole 19 is formed to be inclined with respect to the rotational direction of the chuck portion 5, that is, the rotational direction of the tool holder body 1, so as to recede toward the outer periphery. A portion of the cutting fluid supplied to the fluid path 14 is once sent to the chamber 18 via the through hole 17, and then supplied to each of the plurality of through holes 19 at a uniform pressure. Moreover, since the through hole 19 is inclined in the counter-rotation direction, the cutting fluid is ejected from the end opening of the through hole 19 toward the rear in the rotation direction.

Flanges 21 and 22 are formed on the outer peripheral surface of the chuck portion 5 above and below the opening of the through hole 19, respectively. Further, a cylindrical portion 23 is formed on the outer side of the tip of the flange 21 , 22 downward from the lower end of the outer periphery of the ring 9 . A ring-shaped space 24 is formed between the flange 21, 22 and the cylindrical part 23. Further, the tip of the cylindrical portion 23 is slightly inclined inward to form a gap 25 serving as a nozzle between it and the outer peripheral edge of the flange 22.

At the end opening of the through hole 19, pressurized bone due to the centrifugal force generated as the cutting fluid itself rotates in the through hole 17.19 and the chamber 18 is added to the supply pressure from the fluid path 14 and ejects, causing cutting. The liquid traces a nearly horizontal and backward trajectory and reaches the inner wall of the cylindrical portion 23. The cutting fluid that has reached the cylindrical portion 23 flows downward under its own weight while passing through a slight depression formed on the inner wall of the cylindrical portion 23, passes through the gap 25, and falls downward.

Note that since the cutting fluid is ejected from the plurality of through holes 19 evenly arranged around the outer periphery of the chuck portion 5, each cutting fluid is discontinuous on the rotating surface at the time of ejection. However, the position where the ejected cutting fluid reaches the inner wall of the cylindrical portion 23 moves as the through hole 19 rotates, so after reaching the inner wall (
The cutting fluids from adjacent through holes 19 are continuous with each other before flowing down the recess. As a result, a continuous cylindrical liquid film C is formed in a curtain shape below the gap 25.

Further, the upper surface of the flange 21 is arranged to form an extremely small gap with the lower surface of the ring 9 so that the cutting fluid ejected onto the inner wall of the cylindrical portion 23 does not enter the upper bearing 8 . Further, a labyrinth 26 is formed above the flange 21 at a portion where the ring 9 and the tool holder main body 1 face each other.

In this embodiment, the cutting fluid is supplied from the spindle 3 side to the tool holder body 1, further supplied to the tool T, and a part of it is supplied to the ring 9 pivotally supported outside the tool holder body 1, and the cutting fluid is supplied from the spindle 3 side to the tool holder body 1. By dropping the tool T through the gap 25, which is a nozzle formed in a Herring shape, a curtain-shaped liquid film C made of cutting fluid is formed around the tool T.

As a result, dust-like chips generated from the work being processed by the tool T can be prevented from scattering to the outside.

In particular, in cases where dust consisting of fine particles is generated during processing, such as with graphite, and diffuses into the surrounding area, this liquid film C completely isolates the processed part from the outside world, and the generated dust is removed by the liquid film C. It can be carried out and collected outside.

Furthermore, the outer shape of the liquid film C that is formed has a size that corresponds to the outer diameter of the ring that is pivotally supported on the tool holder body 1, so that it can be made to the minimum necessary size depending on the tool T. . As a result, the outer shape of the liquid film C becomes smaller compared to a conventional machine tool that has a liquid film forming device installed on the spindle head side, and the machinable range becomes wider accordingly. The outer shape is approximately cylindrical, but due to the surface tension of the cutting fluid, it may take on an inverted conical shape with a slightly smaller diameter at the bottom.

In addition, since the liquid film C is formed on the tool holder body 1 side rather than on the spindle head side, even if the machine tool is not equipped with a device for forming a liquid film, as long as the cutting fluid can be supplied from the spindle 3 side. This tool holder can be installed by simply providing the locking portion 13 to prevent rotation on the spindle head side of the machine tool.

Furthermore, the tool T to be used has a cutting fluid supply channel 16 inside.
It is possible to use even those without. In that case, the supply pressure of the cutting fluid is lowered by the amount that the cutting fluid is not supplied to the tool T. Also, if cutting fluid is not required to the tool T,
It is also possible to change the supplied liquid to a cleaning liquid other than cutting fluid.

In this embodiment, when the upper edge of the opening of the through hole 19 is aligned with the lower surface of the flange 21, the ejected cutting fluid is sent to the inner wall of the cylindrical portion 23 while traveling along the lower surface of the flange 21, so that it diffusion is carried out more smoothly. Further, the shape of the through hole 19 can be made not simply circular but flat in the direction of rotation to achieve smoother diffusion in the direction of rotation.

FIG. 2 is a partially broken sectional view of a second embodiment according to the first and second inventions.

In this embodiment, the tool holder body 1 is
The structure of the cutting fluid supply section is different from the first embodiment, and the other parts are the same as the first embodiment.

Hereinafter, different parts will be explained, and parts common to the first embodiment will be given the same numbers and the explanation will be omitted.

As shown in the figure, a fluid path 31 for supplying cutting fluid to the spindle 3 near the joint surface with the tool holder body 1 is formed parallel to the axial direction. A check valve 32 is formed in the large diameter portion at the end of the liquid path 31. The check valve 32 includes a valve body 33 having an inclined surface at its tip, a coil spring 34 that pushes the valve body 33 upward, and a spacer 35 that supports the lower end of the coil spring 34. This check valve 32 is connected to the liquid path 3.
When cutting fluid is supplied from 1 at a certain pressure or higher, the valve body 33 moves back while compressing the coil spring 34 and becomes open. The lower end of the check valve 32 is supported by a pressing member 36 which is fitted onto the lower end surface of the spindle 3 and has an angular cross section. The pressing member 36 has a through hole formed in a portion that supports the check valve 32 to allow the cutting fluid supplied from the check valve 32 to pass therethrough. A pipe 38 is fitted into the lower surface of the pressing member 36. This pipe 38 is pressed against a surface that is perpendicular to the axis of rotation and that forms the shoulder of the tool holder main body l. A liquid passage 40 is formed on the surface of the tool holder body 1 against which the pipe 38 is pressed, and the liquid passage 40 is connected to a liquid passage 14 formed at the center of the tool holder body 1. That is, in this embodiment, the cutting fluid supplied from the fluid path 31 of the spindle 3 via the pipe 38 is sent to the fluid path 14 after passing through the fluid path 40 .

In this embodiment, the check valve 32 is installed in the cutting fluid supply path.
By providing this, when the machining is stopped and the pressure feeding of cutting fluid is stopped, the check valve 32 is immediately closed, and the cutting fluid remaining in the supply path before the check valve 32 is allowed to flow down naturally. There's nothing left to do. As a result, the response to the formation and disappearance of the liquid film C when machining starts and stops becomes clearer, and the tool T, workpiece, or tool holder itself can be replaced without being covered in cutting fluid, making it easier to use. improves.

Further, since the spindle 3 and the tool holder body 1 are engaged with each other by a nose key (not shown), the pipe 38 supported by the spindle 3 and the flow path 40 formed in the tool holder body 1 coincide with each other, allowing continuous cutting fluid flow. Form a flow path.

FIG. 3 is a partially broken sectional view of an embodiment according to the third to fifth aspects of the invention.

This embodiment differs from the embodiments shown in FIGS. 1 and 2 in that compressed air is supplied through the tool holder body 1 to the surface facing the bearing 8 and the ring, and that cutting fluid is supplied to the spindle head side. The method is to supply the ring directly from the source. Other structures are substantially the same as those of the embodiment shown in FIGS. 1 and 2, so common parts are given the same reference numerals and explanations will be omitted.

The different parts will be explained below.

As shown in the figure, an air injection hole 41 for supplying compressed air is formed near the upper end of the tapered surface of the tool holder body 1 to which the spindle 3 is joined. A pull stand 2 is fitted in the center of the upper part of the tool holder main body 1 in the axial direction, and is fixed with a screw.

A groove 42 is formed on the outer periphery of the fitting portion of the pull stand 2, and the inner end of the air injection hole 41 is opened in this groove 42. The pull stand 2 has a radial air passage 4 extending from the groove 42.
3 and an axial air passage 44 are continuously formed in the center. Compressed air supplied from the air injection hole 41 is sent to the air passage 46 formed in the center of the tool holder body 1 via the groove 42 and air passages 43 and 44. Further, the compressed air passes through an air passage 47 formed in the radial direction near the lower end of the tool holder body 1, and is blown out into a ring-shaped space 48 surrounded by the chuck portion 45, the ring 49, the tool holder body 1, and the like. A portion of the compressed air ejected into the space 48 heads upward, passes between the holding nut 12 and the inner peripheral surface of the ring 49, and is supplied to the bearing 8. By supplying compressed air to the bearing 8, cutting fluid and other foreign substances are prevented from entering the bearing 8, thereby preventing corrosion and wear.

The remaining compressed air passes through the labyrinth 51 formed between the chuck part 45 and the inner circumferential surface of the ring 49, and enters the gap 52.
The tightening force flows out along the outer peripheral surface of the ring 7. Similarly, the outflow of compressed air from the labyrinth 51 and the gap 52 prevents foreign matter such as cutting fluid from entering upward, and when the outflow pressure of the compressed air is high, chips generated outside the tool T are prevented. It can be blown away and eliminated.

A cylindrical portion 53 is provided at the upper end of the outer periphery of the ring 49 to supply cutting fluid to the ring 49 .

A connecting tube 55 that is pressed upward by a coil spring 54 is fitted into the cylindrical portion 53 so as to be movable up and down. A plate-shaped engagement member 56 is provided at the central large diameter portion of the connecting pipe 55.
is press-fitted and fixed. When the connecting pipe 55 is ascending, the tip of the retaining member 56 engages with a notch 57 formed in the tool holder body 1 to prevent the tool holder body 1 and the ring 49 from rotating. Further, near the lower end of the connecting tube 55, an O-ring 58 is installed between the connecting tube 55 and the cylindrical portion 53 to seal the connecting tube 55. At the upper end of this connecting pipe 55,
Supply pipe 5 supported by a spindle head (not shown)
By pressing 9 to connect, the connecting pipe 55 is pushed down and the tip of the retaining member 56 is removed from the notch 57, releasing the rotation prevention between the tool holder body 1 and the ring 49. At the same time, since the connecting pipe 55 is supported by the supply pipe 59, the ring 49 is prevented from rotating, and even if the tool holder main body 1 rotates, the ring 49 remains stationary without freely rotating.

Further, a liquid path 61 is formed from the bottom of the cylindrical portion 53 to the center of the ring 49 . The inner end of this liquid path 61 is connected to a chamber 62 formed concentrically with respect to the central axis of the ring 49 . At the inner lower end of the chamber 62, a liquid path 63 having an angled cross-section is formed continuously to the chamber 62. The liquid path 63 is formed around the entire circumference similarly to the chamber 62, and the gap 64 at the open end serves as a nozzle.

Further, a liquid passage 65 is formed on the inner surface of the chamber 62, and the tip thereof is connected to a cutting liquid nozzle 66 disposed on the lower surface of the ring 49. The fluid passages 65 and the cutting fluid nozzles 66 are arranged evenly in the circumferential direction of the ring 49, and the nozzles 66
are connected and fixed to the liquid path 65 by screws, respectively. The tip of this nozzle 66 is directed toward the tool T.

Here, when the cutting fluid is supplied from the supply pipe 59 to the connecting pipe 55, the cutting fluid flows into the chamber 62 through the fluid path 61. The cutting fluid is once stored in the chamber 62, and then a part of it flows out from the gap 64 through the fluid path 63 in a ring shape to form a cylindrical fluid film C. Also, chamber 6
The remaining cutting fluid in the cutting fluid 2 is sent to the nozzle 66 through the fluid path 65, and is ejected from the tip of the nozzle 66 and poured into the tool T.

In this embodiment, compressed air is sent from the spindle 3 side, and a portion of the air is supplied between the inner and outer rings of the hair ring 8 that pivotally supports the ring 49, thereby preventing cutting fluid from entering the bearing 8. To prevent. Therefore, even in poor environments where cutting fluid and chips are splashed, the tool holder body 1
The relative rotation between the ring 49 and the ring 49 is maintained smoothly.

Further, in the sixth invention, in the embodiment shown in FIG. 3, the air resistance of the labyrinth 51 and the gap 52 is appropriately set so that a part of the compressed air blows out to the processing section below,
The gap r452 is a ring-shaped air nozzle.

When air is blown downward from this air nozzle, chips generated during machining are removed from the tool T, and machining can proceed efficiently.

Furthermore, since the cutting fluid nozzle 66 is arranged on the lower surface of the ring 49 located inside the liquid film C, it is possible to pour the cutting fluid from a position closer to the tool T than in conventional models, allowing a small amount of cutting fluid to be poured. It can be supplied more efficiently.

Note that if the nozzle 66 is not required depending on the processing conditions,
It is also possible to remove it and instead seal it with a plug. It is also possible to adjust the flow rate of the cutting fluid by providing a cock in the nozzle 66 itself and opening and closing the cock.

Further, in the embodiment, since the amount of compressed air and the jet of nozzle 66 in the liquid film C is large, the internal pressure increases, and the shape of the liquid film C may swell outward accordingly.

Furthermore, as another embodiment (not shown), it is also possible to adopt a structure in which both compressed air and cutting fluid are supplied from the spindle head side to a ring that is pivotally supported by the tool holder body 1.

In this case, there is an advantage that piping for supplying compressed air and cutting fluid to the spindle 3 side is not required. As a result, even if the spindle itself does not have a supply device for compressed air or cutting fluid, etc., this tool holder can be installed by simply making some modifications to the spindle head side.

(Effects of the Invention) As described above, according to the first invention, the tool holder itself, which is detachably attached to a machine tool, has the function of forming a cylindrical or conical liquid film that covers the tool being processed. This makes it possible to form a liquid film of the minimum necessary size depending on the tool. As a result, the outer diameter of the liquid film that is formed is smaller, which reduces the limitations on the machining range of the machine tool, making it possible to process a wider range than conventional models.

According to the second invention, in the first invention, the injection port for the liquid for forming the liquid film and the injection port for the cutting fluid for supplying into the inside of the tool are made the same, so that the supply of the cutting fluid is improved. Miniaturization is also possible when applied to a tool holder that holds necessary tools.

According to the third invention, similar to the first invention, the tool holder itself, which is detachably attached to the machine tool, has a function of forming a cylindrical or conical liquid film to cover the tool being processed. , it is possible to form a liquid film of the minimum necessary size depending on the tool. As a result, the outer diameter of the liquid film that is formed is smaller, which reduces the limitations on the machining range of the machine tool, making it possible to process a wider range than conventional models.

According to the fourth invention, by supplying compressed air to the facing surface between the outer periphery of the tool holder main body and the ring body and the bearing portion in the third invention, liquid used during machining and generated chips can be removed. This prevents foreign matter from entering the bearing, preventing corrosion and wear of the bearing.

According to the fifth invention, it is possible to supply liquid to the outer circumference of the tool from the nozzle provided inside the slit-shaped nozzle formed in the ring body in the third or fourth invention,
It can also handle machining that requires supply of cutting fluid to the outer circumference of the tool, increasing the versatility of machining.

According to the sixth invention, by forming the air nozzle at the lower end of the outer periphery of the tool holder main body in the fourth invention,
Compressed air is ejected from the air nozzle to the tool section below, making it easier to remove chips from the processing section of the tool, thereby improving processing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a first embodiment according to the first and second inventions, FIG. 2 is a partial sectional view showing a second embodiment according to the first and second inventions, Figure 3 is the third
It is a partial sectional view showing an example concerning the 5th invention. 1... Tool holder body 2... Brewster, do 3... Spindle 8... Bearing 9... Ring 9a... Projection part 13... Engagement part 14.
...Liquid path 15...Space 16...Cutting fluid supply path 1
7...Through hole 18...Chamber 19...Through hole 2
1, 22...Flange 23...Cylindrical part 24...
・Space 25...Gap 26...Labyrinth 31
...Liquid path 32...Check valve 40...Liquid path
41...Air injection hole 42...Groove 43.44...
・Air passage 46.47...Air passage 48...Space 4
9...Ring 5...Labyrinth 52...Gap 53 River cylindrical part 54...Coil spring 55...
Connection pipe 59... Supply pipe 61... Liquid path 62...
・Chamber 63...Liquid path 64...Gap 65・
...Liquid path 66...Cutting fluid nozzle C...Liquid film T
...Tool Figure 2 Figure 1: 1 1; Tool holder book r book 15: Space C: Liquid film T: Hole

Claims (6)

[Claims] (1) A ring body is pivotally supported on the outer periphery of the tool holder body to allow free rotation relative to the tool holder, and a ring body is formed on the ring body and engages with the spindle head side to prevent rotation of the ring body. a slit-shaped nozzle formed in a ring shape at the lower end of the outer periphery of the ring body to cause the supplied liquid to flow downward to form a cylindrical or conical liquid film; and a slit-shaped nozzle formed in the tool holder body, an injection port for introducing liquid supplied from the spindle side into the spindle body;
A tool holder for a machine tool, comprising: liquid supply means for supplying liquid supplied to an inlet to a slit-shaped nozzle part through a facing part between a tool holder body and a ring body. (2) In the tool holder for a machine tool according to claim 1, the liquid supplied from the spindle side to the inlet is used as cutting oil, and a part of the liquid is supplied to the cutting oil supply hole at the upper end of the tool gripped by the tool holder. Mechanical tool holder. (3) A ring body is pivotally supported on the outer periphery of the tool holder body via a bearing, and a ring body is formed on the ring body and engages with the spindle head side to prevent rotation of the ring body and is supplied from the spindle head side. an injection port for introducing liquid into the ring body; a slit-shaped nozzle formed in a ring shape at the lower end of the outer periphery of the ring body and for spouting the supplied liquid downward to create a cylindrical or conical liquid film; A tool holder for a machine tool, comprising: a liquid supply path formed in a body for supplying liquid supplied to an inlet to a slit-shaped nozzle part; (4) In the tool holder for a machine tool according to claim 3, a compressed air inlet is formed in the tool holder body and introduces compressed air supplied from the spindle side into the spindle body; A tool holder for a machine tool, comprising: a compressed air supply path for supplying the supplied compressed air to the outer periphery of the tool holder main body, a facing surface of a ring body, and a bearing portion. (5) The tool holder for a machine tool according to claim 3 or 4, wherein a nozzle for injecting the supply liquid to the outer periphery of the tool is provided inside the slit-shaped nozzle formed in the ring body. (6) The tool holder for a machine tool according to claim 4, wherein an air nozzle is provided at the lower end of the outer periphery of the tool holder main body for ejecting compressed air to the tool section below.