JPH07314273A - Tool holder - Google Patents

Abstract

PURPOSE:To manufacture a tool holder which firmly supports a rotary shaft even if the width in the axial direction of a nonrevolution type supporting member is narrow and has the simple and compact constitution. CONSTITUTION:As for a tool holder equipped with a rotary shaft 1 installed on the spindle of a machine tool and a nonrevolution type supporting member 2 which supports the rotary shaft 1 in a revolution enabled form the nonrevolution type supporting member 2 is tightly connected in free separation on a fixed part 3 on the machine tool side by a lock means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder for mounting a cutting tool on a spindle of a machine tool, and further, for supplying cutting oil from an oil passage on the machine tool side to a rotary cutting tool with an oil hole. A tool holder with a device.

[0002]

2. Description of the Related Art In order to provide a tool holder with an oil supply device and supply cutting oil to a rotary cutting tool with an oil hole attached to the tool holder, the main body of the tool holder must be supported by a spindle in a non-rotating state. .

A conventional tool holder of this type will be described by taking a tool holder provided with an oil supply device as an example. As shown in FIG. 5, a non-rotating support member 2 for rotatably supporting a rotating shaft 1 is provided on the machine tool side. An oil passage connector 8, which will be described later, which can be attached and detached to and from the oil supply table 3 is integrally provided, and the tool oil supply formed on the rotary shaft 1 through the oil passage connection tool 8 and each oil supply table 3 of the non-rotating support member 2. Oil is passed through the passage 5, and oil is supplied from the supply oil passage 5 to the oil hole of the tool.

At this time, the non-rotating support member 2 is formed wide in the axial direction in order to securely support the rotating shaft 1.
A pair of rolling bearings are interposed between the non-rotational support member 2 and the rotary shaft 1 with the tool supply oil passage 5 sandwiched in the axial direction, and the oil passage connector 8 connected to the non-rotational support member 2 is It was designed to be simply fitted to the fueling table 3 which is the fixed portion on the machine tool side.

As a result, the rotation shaft 1 is supported by the non-rotational support member 2 which is wide in the axial direction with the pair of rolling bearings S interposed, and the oil passage connector 8 merely serves as a detent for the non-rotational support member 2. Was in charge of.

[0006]

As described above, in the conventional tool holder, the rotating shaft 1 is supported by the non-rotating supporting member 2 having only the rotation preventing function on the fixed portion 3 on the machine tool side. Therefore, in order to support the rotating shaft 1 as stably as possible, the non-rotating supporting member 2 itself needs to be formed wide in the axial direction with the rolling bearing interposed.
Naturally, the structure was complicated and large.

In view of the above-mentioned problems, the present invention allows the non-rotating support member 2 to be formed as narrow as possible in the axial direction so as to be downsized as a whole, and thereby the rotating shaft 1 can be stably supported. The purpose is to propose a tool holder of this kind.

Further, in the prior art, the tool oil supply passage 5 is formed across the relative interface between the non-rotating support member 2 in the non-rotating state and the rotating shaft 1 in the rotating state as described above. ,
An oil-tight ring 5 is interposed between the two interfaces to prevent oil leakage from the interface.

However, during a long use period,
Alternatively, cutting powder or the like mixed in the cutting oil is caught between the oil-tight ring 5 and the outer peripheral surface of the rotary shaft 1 with which the oil-tight ring 5 is in rotary contact, as shown by a chain double-dashed line H in FIG. On the outer peripheral surface of the rotary shaft with which the oil-tight ring 5 comes into contact, a dent is generated due to sliding frictional resistance of cutting powder or the like, the oil-tightness of the oil-tight ring is destroyed, and cutting oil (coolant) leaks from the dent, There have been many accidents in which the cutting oil penetrates into the rolling bearing portions S, S provided across the oil supply passage and damages the bearings S, S.

An object of the present invention is to solve this problem as well.

[0011]

In order to solve the above problems, in the invention according to claim 1, a rotary shaft 1 attached to a spindle of a machine tool and the rotary shaft 1 are rotatably supported. In the tool holder including the non-rotational support member 2, the non-rotational support member 2 employs a configuration in which the non-rotational support member 2 is detachably fastened to the fixed portion 3 on the machine tool side by the locking means 4. .

According to the second aspect of the present invention, there is provided a tool holder comprising a rotary shaft 1 attached to a spindle of a machine tool, and a non-rotating support member 2 rotatably supporting the rotary shaft 1. The non-rotating support member 2 also serves as a non-rotating oil supply ring 6 that communicates with a tool oil supply passage 5 provided inside the rotating shaft 1, and the non-rotating support member 2 connects the rotating shaft 1 only through an oil-tight bearing 7. The oil passage connector 8 that is supported and connected to the non-rotational support member 2 has a structure in which it is tightly connected to the oil supply table 3 on the machine tool side by the locking means 4.

In the invention according to claim 3, the lock means 4 is a hydraulic lock means which is locked by the hydraulic pressure of oil supplied from the fixed portion 3 on the machine tool side. The configuration described is adopted.

Further, in the invention according to claim 4, the lock means 4 adopts the structure according to claim 2 which is provided inside the fueling table 3.

Further, in the invention according to claim 5, the lock means 4 adopts the structure of claim 2 which is provided inside the tip portion of the oil passage connector 8.

Further, in the invention according to claim 6, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotating shaft 1 and is made of metal, and rotates with the rotating shaft 1, and the sleeve 9. The metal bearing 11, which is in oil-tight contact with 9 and is mounted on the inner peripheral surface of the non-rotating oil supply ring 6 so as to restrict movement in at least the circumferential direction, is employed.

In the invention according to claim 7, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotary shaft 1 and is made of metal, and rotates together with the rotary shaft 1, and the sleeve 9. A metal bearing 11 that is in oil-tight contact with 9 and is axially movable to the inner peripheral surface of the non-rotating oil supply ring 6, but is fitted so as to restrict movement in the circumferential direction; The constitution according to claim 2 is constituted by an urging means 19 which urges the metal bearing 11 in the axial direction to bring the metal bearing 11 into press contact with the sleeve 9.

In the invention according to claim 8, the oil passage connector 8 on the non-rotational support member 2 side is connected to the oil passage connector 8 when the oil passage connector 8 is not connected to the fuel table 3. The tool 8 regulates the rotary shaft 1 to each other to prevent relative rotation between the two, and when the oil passage connector 8 is connected to the fuel table 3, the oil passage connector 8 and the rotary shaft 1 are in the mutually regulated state. The structure according to claim 2 is provided with a relative rotation restricting means 15 which is opened to allow the rotation of the rotary shaft 1.

[0019]

According to the first aspect of the invention, the non-rotating support member 2 for rotatably supporting the rotary shaft 1 is tightly connected to the fixed portion 3 on the machine tool side by the lock means 4. The non-rotating support member 2 is firmly held by the locking means 4 on the fixed portion 3 on the machine tool side, and has not only a rotation preventing function but also a support strength integral with the fixed portion 3, which is why Even if the axial width of 2 is narrow, the rotating shaft 1
Can be firmly supported.

According to the second aspect of the present invention, the non-rotating support member 2 for rotatably supporting the rotary shaft 1 communicates with the tool oil supply passage 5 provided inside the rotary shaft 1 for the non-rotating oil supply ring. Since it also serves as 6, there is no need to separately provide the non-rotational oil supply ring 6 with respect to the non-rotational support member 2, and the structure is simplified accordingly.

Further, the non-rotating support member 2 supports the rotating shaft 1 only through the oil-tight bearing 7, and is not supported by the rolling bearing which is damaged by cutting oil (coolant) as in the conventional case. It is possible to use it for any reason, and it does not hinder the use even if the cutting oil leaks outside.

Further, since the oil passage connector 8 connected to the non-rotational supporting member 2 is adapted to be tightly connected to the oil supply base 3 on the machine tool side by the lock means 4, the same as in the invention according to claim 1. The non-rotating support member 2 is firmly held by the fixing means 3 on the machine tool side by the locking means 4 and has not only a rotation preventing function but also a supporting strength integral with the fixing portion 3, which is why the non-rotating support member 2 is supported. Even if the axial width of the member 2 is narrow, the rotary shaft 1 can be firmly supported.

According to the third aspect of the present invention, the lock means 4 is a hydraulic lock means for locking by the hydraulic pressure of the pressure oil supplied from the fixed part 3 on the machine tool side. It is possible to operate the locking means 4 by using the cutting oil supplied to No. 2 and to release the locking operation of the locking means 4 by stopping the supply of the cutting oil.

Further, in the invention according to claim 4, since the locking means 4 is provided inside the fueling base 3, the diameter of the oil passage connector 8 itself does not increase, which is different from the conventional one. The diameter is the same and the structure does not change.

Further, in the invention according to claim 5, since the locking means 4 is provided inside the tip end portion of the oil passage connector 8, the refueling table itself does not become large and is different from the conventional one. The size is similar and the configuration does not change.

According to the invention of claim 6, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotary shaft 1 and is made of metal, and rotates together with the rotary shaft 1. And a metal bearing 11 mounted on the inner peripheral surface of the non-rotating oil supply ring 6 so as to restrict movement in the circumferential direction at least.
The sleeve 9 and the metal bearing 11 contacting the sleeve 9 reduce the occurrence of wear as much as possible, and the non-rotating oil supply ring 6 is stably supported on the rotating shaft 1 for a long period of time.

In the invention according to claim 7, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotating shaft 1 and rotates with the rotating shaft 1. The sleeve 9 is made of metal. A metal bearing 11 that is in oil-tight contact with 9 and is axially movable to the inner peripheral surface of the non-rotating oil supply ring 6, but is fitted so as to restrict movement in the circumferential direction; A biasing means 19 for biasing the metal bearing 11 in the axial direction to bring the metal bearing 11 into contact with the sleeve 9 in a pressing manner. Therefore, the sleeve 9, the metal bearing 11, and the biasing means for pushing the metal bearing 11 toward the sleeve 9. Reference numeral 19 forms a kind of mechanical seal, and although the rotary shaft 1 rotates at high speed, the cutting oil flowing through the oil supply passage 20 of the non-rotating oil supply ring 6 hardly leaks from between the sleeve 9 and the metal bearing 11. .

According to the invention of claim 8, the oil passage connector 8 on the non-rotational supporting member 2 side is connected to the oil supply table 3 when the oil passage connector 8 is not connected to the oil supply table 3. 8
Regulates each other with the rotating shaft 1 to prevent relative rotation between them, and when the oil passage connector 8 is connected to the fueling table 3, the mutual regulating state of the oil passage connector 8 and the rotating shaft 1 is released. The non-rotational supporting member 2 and the oil passage connector 8 integrated with the non-rotational supporting member 2 are provided when they are escaped from the spindle on the machine tool side because they are provided with the relative rotation restricting means 15 that allows the rotation of the rotating shaft 1. In addition, in a fixed state integrated with the rotary shaft 1, the spindle can be conveyed to the magazine without shaking, and can be accurately accommodated in the magazine.

[0029]

FIG. 1 shows an embodiment of the present invention, in which a manipulator gripping portion 16 and a tapered shank portion 17 are concentrically formed on one end side of a rotary shaft 1 and an oil is formed on the other end portion. The mounting portion 18 of the hole-cutting tool T is formed concentrically.

The rotating shaft 1 is rotatably supported by the non-rotating supporting member 2 via an oil-tight bearing 7, and the oil passage connector 8 is provided on one side of the non-rotating supporting member 2 in the radial direction so as to be parallel to the rotating shaft 1. The oil passage connector 8 is attached to the oil supply table 3 fixed to the machine tool at its tip end, and is tightly connected to the oil supply table 3 by the locking means 4.

The non-rotating support member 2 has a metallic non-rotating oil supply ring 6 and a metal bearing 11 fitted in an annular step portion 13 on the inner peripheral surface thereof.

As shown in FIG. 2, the metal bearing 11 is formed in an annular shape in a front view, and flat portions 11a are provided on the outer peripheral surface thereof at appropriate intervals. The flat surface 11a is an annular step of the non-rotating oil supply ring 6. By matching a flat surface (not shown) provided on the inner peripheral surface of the surface 13, the metal bearing 11 can move in the axial direction on the inner peripheral surface of the non-rotating oil supply ring 6, but in the circumferential direction. Movement is regulated. As shown in FIG. 2, oil grooves 11a are formed on the front side of the metal bearing 11 at appropriate intervals in the circumferential direction, and the cutting oil accumulated in the oil grooves 11a smoothes the contact surfaces of the sleeve 9 and the metal bearing 11 with each other. It is designed to improve the slidability.

On the inner peripheral surface of the non-rotating oil supply ring 6, an annular oil passage 20 communicating with the tool oil supply passage 5 provided on the rotary shaft 1 is formed, and an oil-tight bearing including a sleeve 9 and a metal bearing 11. By means of 7, the cutting oil flowing through the annular oil passage 20 is prevented from leaking to the outside.

A metal sleeve 9 consisting of a thick first sleeve 9a, a plate-shaped second sleeve 9b and a thick third sleeve 9c is axially adjacent to the outer peripheral surface of the rotary shaft 1. Mated.

The non-rotating support member 2 and the metal bearing 1
1 and the metal sleeve 9 are attached to the rotary shaft 1 in such a manner that the first sleeve 9a is externally fitted to the rotary shaft 1 and is brought into contact with the outer peripheral step portion 1a, and then the second sleeve 9b is externally fitted. , The non-rotational support member 2 fitted with the metal bearings 11, 11 is externally fitted to the outer peripheral side thereof, and then the third sleeve 9c.
Is externally fitted, and finally the nut 22 is screwed onto the rotary shaft 1, whereby the metal sleeve 9 composed of the first to third sleeves 9a, 9b, 9c is integrally fixed to the rotary shaft 1 and is not rotated. The metal bearing 11 on the support member 2 side is the first sleeve 9a.
And the third sleeve 9c, the metal bearing 11 on the non-rotational support member 2 side and the metal sleeve 9 on the rotary shaft 1 side are oil-tightly rotatable in this state.

As for the non-rotating support member 2 and the oil passage connector 8, one end side of the oil passage 21 is screwed into the non-rotating support member 2, and the connecting ring portion 21a on the other end side of the oil passage connector 8 is screwed into the screw 21.
It is connected by the oil passage pipe 21 by being stopped by b.
The oil passage 23 of the oil passage connector 8, the oil passage 24 of the oil passage 21 and the annular oil passage 20 of the non-rotating oil supply ring 6 are communicated with each other via the oil passage 21. The oil passage 21 constitutes a part of a member that maintains the non-rotating state of the non-rotating support member 2.

The oil passage connector 8 has a hollow pin shape,
The oil supply table 3, which is a fixed portion into which the tip of the oil passage connector 8 is engaged, is fixed to the main body 25 of the machine tool, and the lock means 4 is provided inside the oil supply table 3.

That is, the fueling table 3 comprises a cylinder body 26 and an inner cylindrical portion 27 concentrically provided inside the body 26,
A clamping piston 28 is interposed between the cylinder body 26 and the inner cylinder portion 27, and hydraulic pressure is applied to one end side of the clamping piston 28 and the return spring 29 is applied to the other end side thereof. Further, the tip end of the oil passage connector 8 is engaged with the inner tube portion 27, and the communication tube 31 pressed by the compression small spring 30 is slidably fitted on the tip end side thereof. ing. Further, a clamp ball 32 is fitted in the inner cylinder portion 27 so as to penetrate inward and outward in the circumferential direction thereof, and the outer peripheral side thereof abuts a tapered surface 33 provided on the clamp piston,
The inner peripheral side is adapted to engage with the clamp groove 34 provided on the outer peripheral surface of the tip portion of the oil passage connector 8.

The operation will be described. The cylinder body 26
The pressure oil introduced into the cylinder pushes the clamping piston 28 against the urging force of the return spring 29 on the other end side and moves to the right in the drawing, and is thereby pushed by the tapered surface 33 provided on the clamping piston 28. And the clamp ball 32 is strongly engaged with the clamp groove 34 provided in the oil passage connector 8,
The oil passage connector 8 is firmly and immovably connected to the oil supply table 3 by locking the oil supply table 3 so as not to be able to escape from the oil supply table 3 and by strongly engaging the clamp groove 32 with the clamp groove 34. The non-rotating support member 2 connected to the connector 8 is firmly held.

Further, when the introduction of the pressure oil to the oil supply table 3 is stopped, the pressure oil force inside the silling main body 26 disappears, so that the clamp piston 28 is pushed back by the return spring 29, and the clamp ball 32 is biased to the outer peripheral side. Since it is in a state of being easily transferred, the oil passage connection tool 8 can be easily escaped from the oil supply stand 3 by the pulling force of the oil passage connection tool 8 from the oil supply stand 3.

The connecting tube 31 sliding in the inner tube portion 27 when the oil passage connector 8 is detached from the oil supply table 3 is pushed by the small compression spring 30 to move, and a stopper projecting from one end of the connecting tube 31. When 31 a hits the clamping piston 28, it is prevented from coming out of the inner cylinder portion 27. The connecting cylinder 31 has a role of connecting the introduction of the pressure oil from the machine tool side when the oil passage connector 8 is engaged with the oil supply table 3 and preventing the escape of the pressure oil applied to the clamping piston 28. It is a thing.

Further, the oil passage connector 8 is provided with a relative rotation regulating means 1
5, the relative rotation restricting means 15 includes a rotation stopping member 35 including a collar 35a that moves along the outer peripheral surface of the oil passage connector 8 and an engagement pin 35b that integrally projects at a right angle to the collar 35a. A compression coil spring 36 for urging the member 35 to come into contact with the tip surface of the fueling table 3, and an engagement pin 35.
and the engaging hole 37 provided on the rotary shaft 1 side so that b is engaged.

The state of FIG. 1 shows a state in which the shank portion 17 of the tool holder is fitted to the spindle 38 of the machine tool, and at this time, the engagement pin 3 of the rotation preventing member 35.
5b abuts on the tip end surface of the fueling table 3 and retreats against the urging force of the compression coil spring 36, and the engagement pin 35b escapes from the engagement hole 37 on the rotary shaft 1 side and does not rotate with the rotary shaft 1. The relative rotation with the support member 2 is freely possible.

Although not shown, when the shank portion 17 of the tool holder is disengaged from the spindle 38 of the machine tool, the detent member 35 is urged by the compression coil spring 36 in accordance with the disengagement operation, so that the engaging pin 35b thereof. Rotating shaft 1
Side engaging hole 37 to engage with rotating shaft 1 and non-rotating support member 2
It is designed to prevent relative rotation with.

However, the pressure oil introduced from the machine tool side into the cylinder body 26 of the oil supply table 3 passes through the oil supply passage 23 of the oil passage connector 8 fitted into the inner cylinder portion 27 from the communication cylinder 31. It passes through the oil passage 24 of the oil passage 21 and the annular oil passage 20 of the non-rotating oil supply ring 6, and then passes through the tool oil supply passage 5 of the rotating shaft 1 which is in the middle of rotation to the mounting portion 18 at the tip of the rotating shaft 1. Although it is supplied to the oil hole h of the attached cutting tool T with an oil hole, the non-rotating support member 2 in the non-rotating state, to be precise, the metal bearing 1 on the non-rotating oil supply ring 6 side.
1 and the rotating shaft 1 in the rotating state, to be precise, the metal sleeve 9 is constantly in oil-tight contact with the oil-tight bearing 7 that axially supports the non-rotating support member 2 and the rotating shaft 1. Since they are formed, the pressure oil is discharged as cutting oil from the tip of the tool T while the relative interface between the two is kept oiltight.

The metal sleeve 9 and the metal oil-tight ring 13 are made of steel or iron, and are made of a general steel plate plated with chromium, made of hardened steel or super hard material, or It is preferable that at least the surface of the metal bearing 11 has abrasion resistance, such as those obtained by coating ceramics or titanium nitrite on them. It is preferably formed by a metal material such as a foreign metal material.

FIG. 3 shows another embodiment of the locking means 4. In this embodiment, the cylinder body 26 is formed thick and the pressure oil passage 26a is formed in the thick portion. A pair of clamp pistons 28 are provided so as to be orthogonal to the oil passage connector 8 fitted in the center of the cylinder body 26, and the clamp piston 28 is provided in the oil passage connector 8 with a clamp groove 34. The oil passage connector 8 is tightly connected to the fuel table 3 by directly engaging with According to this embodiment, the number of parts is small and it can be manufactured at low cost. In this embodiment as well, a communication cylinder 31 that is pressed by a small compression spring 30 that plays the same role as in the above embodiment, and a return spring 29 that returns the clamping piston 28 are provided.

FIG. 4 shows another embodiment of the lock means 4. In both of the above embodiments, the lock means 4 is provided on the fuel table 3 side. In this case, the lock means 4 is provided at the tip of the oil passage connector 8, and a hollow thick cylindrical piston 28 for clamping is provided in the hollow portion at the tip of the oil passage connector 8. The end face side receives the hydraulic pressure, and the other end face receives the biasing force of the return spring 29, and the clamp ball 32 penetrating inward and outward on the outer peripheral side of the oil passage connector 8 is provided on the outer peripheral side of the fuel table 3. It engages with the clamp groove 34 provided on the peripheral surface, and contacts the tapered surface 33 provided on the clamping piston 28 on the inner peripheral side. 28 goes to the right in the figure, and on its tapered surface 33 Clamping the ball 32 in contact is that so as to lock the disabling escape oil passage connection device 8 is strongly engaged with the clamp groove 34 of the oil supply block 3 via the fuel supply table 3.

According to this embodiment, since the locking means 4 is not provided on the fueling table 3 side, it can be formed to have a small diameter, and the locking means 4 can be provided by providing the locking means 4 on the oil passage connector 8. There is no need to distinguish between the oil passage for operating and the oil passage to the cutting tool, and therefore, the communication cylinder as described above does not have to be provided.

[0050]

According to the invention of claim 1, the non-rotating support member 2 for rotatably supporting the rotating shaft 1 is tightly connected to the fixed portion 3 on the machine tool side by the locking means 4. The non-rotating support member 2 is firmly held by the locking means 4 on the fixed portion 3 on the machine tool side, and has not only a rotation preventing function but also a support strength integral with the fixed portion 3, which is why Even if the axial width of 2 is narrow, the rotating shaft 1
Can be firmly supported, and as a result, a tool holder having a simple structure and a compact structure can be manufactured.

According to the second aspect of the present invention, the non-rotating support member 2 for rotatably supporting the rotating shaft 1 communicates with the tool supply oil passage 5 provided inside the rotating shaft 1 for the non-rotating oil supply ring. Since it also serves as 6, it is not necessary to separately provide the non-rotational oil supply ring 6 with respect to the non-rotational support member 2, and the structure can be simpler and the cost can be reduced.

Since the non-rotating support member 2 supports the rotary shaft 1 only through the oil-tight bearing 7, and is not supported by the rolling bearing which is damaged by cutting oil (coolant) as in the conventional case, it is safer. In addition to being able to be used for, it can be stably used without causing any trouble even if the cutting oil leaks to the outside.

Furthermore, since the oil passage connector 8 connected to the non-rotating support member 2 is tightly connected to the oil supply table 3 on the machine tool side by the lock means 4, the same as in the invention according to claim 1. The non-rotating support member 2 is firmly held by the fixing means 3 on the machine tool side by the locking means 4 and has not only a rotation preventing function but also a supporting strength integral with the fixing portion 3, which is why the non-rotating support member 2 is supported. Even if the axial width of the member 2 is narrow, the rotary shaft 1 can be firmly supported, and as a result, a tool holder having a simple structure and compact size can be manufactured.

According to the third aspect of the present invention, the lock means 4 is a hydraulic lock means that locks by the hydraulic pressure of the pressure oil supplied from the fixed portion 3 on the machine tool side. The lock means 4 can be operated by using the cutting oil supplied to the second part 2, and the lock operation of the lock means 4 can be released by stopping the supply of the cutting oil, and the operation operation of the lock means 4 is easy. Is.

Further, in the invention according to claim 4, since the locking means 4 is provided inside the fueling base 3, the diameter of the oil passage connector 8 itself does not increase, which is different from the conventional one. The diameter is the same and the structure does not change.

Further, in the invention according to claim 5, since the locking means 4 is provided inside the tip end portion of the oil passage connector 8, the refueling table itself does not become large and is different from the conventional one. It is the same size, and the configuration does not change,
Can be installed on existing equipment.

According to the invention of claim 6, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotary shaft 1 and is made of metal, and rotates with the rotary shaft 1. And the metal bearing 11 mounted on the inner peripheral surface of the non-rotating oil supply ring 6 so as to restrict movement in the circumferential direction at least.
The sleeve 9 and the metal bearing 11 contacting the sleeve 9 reduce the occurrence of wear as much as possible, and the non-rotating oil supply ring 6 is stably supported on the rotating shaft 1 for a long period of time.

When the metal sleeve 9 and the metal bearing 11 are worn due to long-term use, the sleeve 9 is worn.
Only the metal bearing 11 and the metal bearing 11 need to be replaced, and the rotating shaft 1 does not need to be replaced, so the maintenance cost is very low.

Further, in the invention according to claim 7, the oil-tight bearing 7 is detachably fitted to the outer peripheral surface of the rotating shaft 1 and is made of metal, and rotates together with the rotating shaft 1, and the sleeve 9. A metal bearing 11 that is in oil-tight contact with 9 and is axially movable to the inner peripheral surface of the non-rotating oil supply ring 6, but is fitted so as to restrict movement in the circumferential direction; A biasing means 19 for biasing the metal bearing 11 in the axial direction to bring the metal bearing 11 into contact with the sleeve 9 in a pressing manner. Therefore, the sleeve 9, the metal bearing 11, and the biasing means for pushing the metal bearing 11 toward the sleeve 9. 19 forms a kind of mechanical seal, and although the rotating shaft 1 rotates at high speed, the cutting oil flowing through the oil supply passage 20 of the non-rotating oil supply ring 6 hardly leaks from between the sleeve 9 and the metal bearing 11. Stable over a long period of time It is possible to use Te.

According to the invention of claim 8, the oil passage connector 8 on the non-rotational supporting member 2 side is connected to the oil supply table 3 when the oil passage connector 8 is not connected to the oil supply table 3. 8
Regulates each other with the rotating shaft 1 to prevent relative rotation between them, and when the oil passage connector 8 is connected to the fueling table 3, the mutual regulating state of the oil passage connector 8 and the rotating shaft 1 is released. The non-rotational supporting member 2 and the oil passage connector 8 integrated with the non-rotational supporting member 2 are provided when they are escaped from the spindle on the machine tool side because they are provided with the relative rotation restricting means 15 that allows the rotation of the rotating shaft 1. In addition, in a fixed state integrated with the rotary shaft 1, the spindle can be conveyed to the magazine without shaking, and can be accurately accommodated in the magazine.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing a main part of the present invention.

FIG. 3 is a sectional view showing still another essential part of an embodiment of the present invention.

FIG. 4 is a sectional view showing still another essential part of an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating shaft 2 non-rotating support member 3 fixed part (fueling stand) 4 locking means 5 tool oil supply passage 6 non-rotating oil supply ring 7 oil-tight bearing 8 oil passage connector 9 metal sleeve 11 metal bearing 11 19 biasing means

Claims (8)

[Claims] 1. A tool holder comprising a rotating shaft 1 attached to a spindle of a machine tool and a non-rotating supporting member 2 rotatably supporting the rotating shaft 1, wherein the non-rotating supporting member 2 is on the machine tool side. A tool holder characterized in that it is detachably fastened to a fixed portion 3 of the same by a locking means 4. 2. A tool holder comprising a rotating shaft 1 attached to a spindle of a machine tool and a non-rotating supporting member 2 rotatably supporting the rotating shaft 1, wherein the non-rotating supporting member 2 is the rotating shaft 1. Also serves as a non-rotating oil supply ring 6 communicating with a tool oil supply passage 5 provided inside, and the non-rotating support member 2 supports the rotating shaft 1 only through an oil-tight bearing 7 and is connected to the non-rotating support member 2. A tool holder characterized in that the oil passage connector 8 to be connected is tightly connected to the oil supply table 3 on the machine tool side by the locking means 4. 3. The tool holder according to claim 1, wherein the lock means 4 is a hydraulic lock means that is locked by hydraulic pressure of oil supplied from the machine tool side fixed portion 3. 4. The tool holder according to claim 2, wherein the locking means 4 is provided inside the fueling table 3. 5. The tool holder according to claim 2, wherein the locking means 4 is provided inside the tip of the oil passage connector 8. 6. The oil-tight bearing 7 includes a metal sleeve 9 which is detachably fitted to the outer peripheral surface of the rotary shaft 1 and rotates together with the rotary shaft 1, and a non-rotating metal sleeve 9 which contacts the sleeve 9 in an oil-tight manner. The tool holder according to claim 2, comprising a metal bearing 11 mounted on the inner peripheral surface of the oil supply ring 6 so as to be restricted from moving in the circumferential direction. 7. The oil-tight bearing 7 is a metal sleeve 9 which is detachably fitted to the outer peripheral surface of the rotating shaft 1 and rotates together with the rotating shaft 1, and a non-rotating contact with the sleeve 9 in an oil-tight manner. A metal bearing 11 fitted to the inner peripheral surface of the oil supply ring 6 so as to be movable in the axial direction but restricted in movement in the peripheral direction.
And the metal bearing 11 is urged in the axial direction.
The tool holder according to claim 2, further comprising a biasing means 19 for pressingly contacting the sleeve 9 with the sleeve 9. 8. The oil passage connector 8 on the non-rotational support member 2 side restricts the oil passage connector 8 and the rotary shaft 1 from each other when the oil passage connector 8 is not connected to the fuel table 3. Therefore, the relative rotation of the both is prevented, and when the oil passage connector 8 is connected to the fueling table 3, the mutual restriction state of the oil passage connector 8 and the rotating shaft 1 is released to prevent the rotation of the rotating shaft 1. The oil supply device for a tool holder according to claim 2, further comprising a relative rotation restricting means 15 which permits the relative rotation.