JP2949038B2 - Liquid supply cap for tool holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply cap to be mounted on a rotary tool holder, and more particularly, to a drilling and a non-perforated tool which can be used similarly, and a cutting machine introduced into the holder. The present invention relates to a structure of a cap capable of supplying a liquid to an arbitrary cutting position.

[0002]

2. Description of the Related Art In the case of drilling, tapping, boring, and end milling in milling using a machining center or the like, it may be necessary to supply a cutting fluid to a cutting position to perform lubrication or cooling. is there.

FIG. 8 shows a structure of a conventional tool holder capable of supplying a cutting fluid through the inside of the holder.

In this tool holder, a tool mounting hole 43 for mounting the tool 3 using a collet chuck 42 is provided at the tip of the holder shank 41, and the tool mounting hole 43 is provided inside the holder shank 41 from the rear end of the shank. A liquid supply hole 44 penetrating the tool 3 is provided, and the back surface of the tool 3 is brought into contact with a stopper bolt 45 attached to the liquid supply hole 44 to adjust the amount of protrusion of the tool 3.

[0005] In the above-mentioned tool holder, the cutting fluid introduced from the main spindle of the milling machine into the fluid supply hole 44 is sent to the back surface of the tool 3 through the internal hole 46 of the stopper bolt 45.
It is supplied to the tip position of the tool through a through hole 47 formed inside the tool 3.

However, in the tool holder having the above structure, the cutting fluid is discharged through the through hole 47 inside the tool 3, so that the cutting fluid cannot be discharged by a tool having no hole having no through hole. There is a problem that the types of tools that can be used are limited.

Further, since the cutting fluid is supplied directly to the tip of the tool through the inside of the tool 3, the supply direction of the cutting fluid is changed to other cutting positions, and the amount of the cutting fluid supplied is set to an arbitrary value. Therefore, there is a problem that lubrication and cooling by the cutting fluid cannot be adjusted to an optimum state.

In a conventional ordinary milling machine,
An external lubricator is provided for supplying cutting fluid to the cutting position from outside the spindle on which the tool holder is mounted,
Since such an external lubricating device is configured to manually adjust the supply direction and the supply amount of the cutting fluid, the supply direction and the supply amount are adjusted according to various tools having different lengths attached to the tool holder. It is extremely difficult to properly adjust, and there is a problem that is practically impossible when the number of tools is large.

Therefore, Japanese Utility Model Laid-Open No. 6-27046 discloses
A nozzle ring is detachably attached to the tip of the tool holder
The cutting fluid from the nozzle provided on this nozzle ring
A fluid supply device that gushes toward the outer periphery and cutting part of
doing.

SUMMARY OF THE INVENTION The apparatus disclosed in the above publication is
Just change the slur ring or the nozzle provided on it.
It is said that it can be applied to a variety of tools.
It is not designed for both tools and tools without holes
No. In addition, no change is required for changes in the tool diameter and the number of nozzles.
It is necessary to replace the whole slur ring to deal with it.
It is not preferable because the number of nozzle rings to be prepared increases. An object of the present invention is to solve the above-mentioned problem,
Attach a cap to the tool holder opening, and
By changing some of the parts attached to the
It is an object of the present invention to provide a structure which enables use of a tool having a hole and a hole without being changed, and which can cope with a change in a tool diameter and an increase / decrease in the number of nozzles .

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a cap attached to an opening of a holder shank for mounting a tool, the cap body being fixed to the opening, and a cap. A seal ring detachably attached to a central portion of the main body, the seal ring having a through hole through which a tool mounted on a tool holder is inserted, and a supply port for communicating an inner surface and an outer surface of the cap to the cap body. A liquid passage is provided, and a thread is provided in this liquid supply passage.
The nozzle which can change the discharge direction of the cutting fluid from the fluid supply passage to the screw part is detachably attached.
Liquid supply passage that can be attached to the threaded part by replacing the nozzle
Including screw plugs for closing and before changing the tool diameter
The seal ring has a through hole with a diameter corresponding to the tool diameter.
It was exchanged for that .

This liquid supply cap has the following form.
It can be changed to any of the three types. (1) A nozzle with only a nozzle attached. (2) Only the screw stopper is attached to the screw part. (3) Use multiple threads and insert nozzles in some
Screw caps are attached to the threaded parts .

The cap of the above-mentioned form (2) is used with a drilling tool.
Either use them in combination or insert through holes in the seal ring.
A gap through which cutting fluid can flow is formed between the hole and the tool.
To be used in combination with a holeless tool.

In the case of providing a plurality of threaded portions, the liquid supply passage is formed by a circumferential groove surrounding the inner peripheral surface of the cap body and a plurality of discharge holes communicating the circumferential groove with the outer surface of the cap. and, together with arranging the respective discharge holes around the through-hole of the seal ring, Ru said threaded portion provided on the inside of each discharge hole
Is preferred.

[0014]

With the above structure, the cap closes the opening of the holder shank, so that the cutting fluid introduced into the holder shank is discharged to the outside through the liquid supply passage of the cap.

In this case, the supply direction of the cutting fluid can be changed by adjusting the nozzle incorporated in the oil supply passage.

When the diameter of the tool to be used changes, it can be dealt with by replacing only the seal ring of the cap and adjusting the through hole of the ring to the diameter of the tool.

Further, by disposing a screw stopper in place of the nozzle in the liquid supply passage to close the passage, the discharge of the cutting fluid from the cap can be stopped. For this reason, a perforated tool having a through hole therein can be mounted, and the cutting fluid in the holder can be supplied to the cutting position through the inside of the tool.

Further, with the liquid supply passage closed with a screw stopper ,
The provision of gap between the through hole and the tool of shea Ruringu,
The cutting fluid can be blown out from the gap, so that it is possible to use a tool without holes.

[0019] Furthermore, by arranging a plurality of discharge holes around the shea Ruringu, when so as to close a part of the discharge hole, is possible to change the supply amount of the cutting fluid, depending on the number of discharge holes plugged it can.

[0020]

1 to 5 show a tool holder to which a cap according to an embodiment is attached. This tool holder is for tool 3
Holder shank 1 for mounting
A pull stud bolt 4 for pulling a tool holder into a main shaft of a milling machine is attached to a rear end of the holder shank 1.

A tool mounting hole 5 having a tapered surface 6 is formed at the tip of the holder shank 1.
The collet chuck 7 holding the tool 3 is stored.

A liquid supply hole 8 penetrating from the tool mounting hole 5 to the rear end of the holder shank is formed inside the holder shank 1. The liquid supply hole 8 is provided with a collet chuck 7.
Is inserted.

The pull-in bolt 9 is composed of a connecting bolt 10 connected to the rear end of the collet chuck 7 and an operating bolt 11 screwed into the inner diameter side of the connecting bolt 10. The connecting bolts 10 are provided to face each other. Screw 12,
12 and is mounted so that it can move only in the axial direction.

In the above-mentioned retracting bolt 9, the operating bolt 1
1 to rotate the connecting bolt 10 and the collet chuck 7
Is retracted, the tapered surface 6 of the tool mounting hole 5 and the collet chuck 7 are pressed against each other, the collet chuck 7 is reduced in diameter, and the tool 3 is held and fixed.

The connecting bolt 10, the operating bolt 11, and the pull stud bolt 4 have through holes 4a, 10a, and 11a, respectively, through which cutting fluid is introduced to the tool mounting hole 5. It is supposed to be.

On the other hand, as shown in FIGS. 2 and 3, the cap 2 of the embodiment has a cap body 13 fitted into the opening at the tip of the holder shank 1 and a seal attached to the central hole 28 of the cap body 13. A through hole 15 through which the tool 3 mounted on the holder shank 1 is inserted is formed at the center of the seal ring 14.

The cap body 13 is provided with a flange portion 17 on the outer peripheral portion which fits into the fitting portion 16 at the tip of the holder shank 1, and the flange portion 17 is fixed to the holder shank 1 by a plurality of bolts 18. It consists of

The flange portion 17 of the cap body 13
Is formed with a liquid supply passage 19 for discharging the cutting fluid from the inner surface to the outer surface of the cap.

The liquid supply passage 19 is formed by a circumferential groove 20 surrounding the inner peripheral surface of the flange portion 17 and a plurality of discharge holes 21 communicating axially from the circumferential groove 20 to the outer end surface of the cap 2. The discharge holes 21 are arranged at equal intervals along a concentric circle centered on the seal ring 14.

A screw portion 22 is formed at the outlet of each of the discharge holes 21, and a nozzle 23 is removably incorporated in each screw portion 22.

As shown in FIG. 2, the nozzle 23 is provided with a through hole 25 inside a screw member 24, and the through hole 25
The ball valve 26 and the spring 27 for crimping are assembled at the outlet of the ball valve 26, and the discharge direction of the cutting fluid can be arbitrarily changed by adjusting the direction of the hole of the ball valve 26.

On the other hand, the seal ring 14 attached to the central hole 28 of the cap body 13 is provided with a flange 2 provided on the outer peripheral surface.
9 is engaged with the inner peripheral edge of the center hole 28 so that the cap main body 13 can be detached from the cap main body 13 from the inside. Liquid leakage from the contact portion with the seal ring 14 is prevented.

A plurality of types of seal rings 14 having different diameters of the through holes 15 with respect to one cap 2 are prepared in advance, and an appropriate penetration is made in accordance with a change in the diameter of the tool 3. A seal ring 14 having a hole 15 can be selected.

The tool holder of this embodiment has the above-mentioned structure. When using a tool without a hole having no through hole, a cap 2 is attached to the tip of a holder shank 1 as shown in FIG. The cutting fluid is introduced into the liquid supply hole 8 of the holder shank 1 in a state where the tool 3 having no tool is mounted on the collet chuck 7.

In this state, the cutting fluid is
The cutting fluid passes through the inside of each of the bolts 10 and 11 to the tool mounting hole 5, but the cutting fluid passes through the fluid supply passage 19 of the cap 2 because the opening at the tip of the holder shank 1 is closed by the cap 2. Is discharged outside.

In this case, by adjusting the direction of the ball valve 26 of the nozzle 23, the cutting fluid can be supplied to any required cutting position.

In the plurality of discharge holes 21, the screw portions 22 of some of the discharge holes 21 have solid screw plugs 3 as shown in FIG.
By attaching 2 and closing the discharge holes 21, the number of discharge holes 21 for discharging the cutting fluid changes, so that the amount of cutting fluid that can be supplied to the cutting position can be increased or decreased.

On the other hand, when a perforated tool having a through hole is used, as shown in FIG. 5, all the discharge holes 21 of the cap 2 are closed with screw plugs 22 and the liquid supply passage 19 is closed.

As a result, the cutting fluid introduced into the holder shank 1 is prevented from being discharged from the cap 2.
It is sent to the cutting position through the through hole 47 inside the tool 3.

FIG. 6 shows another embodiment. In this example, the diameter of the through hole 15 provided in the center of the seal ring 14 of the cap 2 is made larger than the diameter of the tool 3 to be mounted,
A gap 34 is provided between the through hole 15 and the tool 3 for inserting the seal ring 14 in the axial direction.

In the above-described tool holder, when the cutting fluid is introduced into the holder with the holeless tool 3 mounted in a state where the liquid supply passage 19 of the cap 2 is closed with the screw plug 32 as shown in the figure, the cutting is performed. The liquid is discharged to the outside of the holder through the gap 34 of the through hole 15 and sent to the tip end position of the tool 3.

In the example shown in FIG. 7, in a cap structure similar to the above, the through hole 15 is formed by a tapered hole whose diameter is reduced outward, and the size of the gap 34 is reduced.
It is formed so as to become gradually smaller toward the outlet side of the cutting fluid.

In this structure, the discharge direction of the cutting fluid is deflected in the direction toward the center, and is controlled so as to be ejected along the surface of the tool 3.

As described above, the tool holder according to the above-described embodiment can support both a tool with a hole and a tool without a hole.
Since the supply direction and supply amount of the cutting fluid can also be adjusted arbitrarily, at the time of mounting the tool on the tool holder, the discharge method, supply direction, supply amount, etc. of the cutting fluid must be determined in advance according to the type of the tool, the projection length, etc. By performing the adjustment, it is possible to supply the optimum cutting fluid according to the tool in the actual cutting, and to realize stable cutting.

In each of the above-described embodiments, the collet chuck 7 is pulled in by the pull-in bolt 9 to hold the tool. However, by changing the mounting structure of the cap 2, the collet is changed as shown in FIG. The present invention can also be applied to a holder having a structure in which the chuck is fastened on the front end side.

The present invention can be similarly applied to a holder for mounting a tool by a method other than the collet chuck for holding a bolt or the like.

[0047]

As described above, according to the present invention , the liquid supply passage is provided in the cap attached to the holder shank, and the liquid supply passage is provided in the passage.
Since the cutting fluid supply method is switched by selectively mounting the chisel and screw stopper, fluid supply can be performed for both drilled and non-drilled tools, and the advantage that the types of tools that can be used can be greatly expanded is provided. is there. In addition, the removable
Tool ring and replace the seal ring to reduce the tool diameter.
Since it was designed to respond to changes, the liquid supply passage and screw
No need to prepare several types of girder caps
There is no.

[0048] Further, the double screw portion to the liquid supply passage of the cap
Nozzles on some of the threads and threads on the remaining threads.
Change the position and number of nozzles for cutting fluid
It is possible to arbitrarily adjust the supply point and the supply amount, and to set an optimum liquid supply state according to the tool to be used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a tool holder equipped with a cap according to an embodiment.

FIG. 2 is an enlarged longitudinal sectional view of a main part of FIG. 1;

FIG. 3 is a side view of the above.

FIG. 4 is an exploded perspective view of the above cap.

FIG. 5 is a longitudinal sectional view showing an example of use of a drilling tool.

FIG. 6 is a longitudinal sectional view showing another embodiment.

FIG. 7 is a longitudinal sectional view showing an improved example of the above.

FIG. 8 is a longitudinal sectional view showing a conventional tool holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder shank 2 Cap 3 Tool 5 Tool mounting hole 7 Collet chuck 9 Pull-in bolt 13 Cap body 14 Seal ring 15 Through hole 19 Liquid supply passage 20 Circumferential groove 21 Discharge hole 23 Nozzle 32 Screw plug 34 Clearance

Claims (4)

(57) [Claims] 1. A cap attached to an opening of a holder shank for mounting a tool, comprising: a cap body fixed to the opening; and a seal ring detachably attached to a central portion of the cap body. In the seal ring, a through hole through which a tool mounted on the tool holder is inserted is formed, a liquid supply passage communicating the inner surface and the outer surface of the cap is provided in the cap body, and a screw portion is provided in the liquid supply passage.
A nozzle capable of arbitrarily changing the direction in which the cutting fluid is discharged from the liquid supply passage is detachably attached to the screw portion of the lever.
Closes the liquid supply passage that can be attached to the screw part by replacing the nozzle
Include screw plugs for closing, and for changes in tool diameter,
Seal rings with through holes of a diameter corresponding to the tool diameter
A liquid supply cap for the tool holder, which can be replaced with a new one . 2. A liquid supply passage of the liquid supply cap according to claim 1.
A screw plug in place of the nozzle is detachably attached to the thread of the road.
The liquid supply passage is closed with this screw stopper, and the seal
The cutting fluid is supplied through the internal through hole
For liquid supply of a tool holder through which a drilled tool is inserted
cap. 3. A liquid supply passage of the liquid supply cap according to claim 1.
A screw plug in place of the nozzle is detachably attached to the thread of the road.
The liquid supply passage is closed with this screw stopper, and the seal
Cutting fluid can flow between the through hole and the tool.
For supplying liquid to the tool holder with a functioning gap
cap. 4. The liquid supply passage is formed by a circumferential groove surrounding the inner peripheral surface of the cap body and a plurality of discharge holes communicating the circumferential groove with the outer surface of the cap. 4. The liquid supply cap for a tool holder according to claim 1, wherein the liquid supply cap is arranged around a through hole of the seal ring and a screw portion is provided inside each discharge hole.