JP2698760B2 - 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 tool holder having a liquid supply hole therein, and more particularly, to a liquid supply structure of a stopper bolt for adjusting a projecting amount of a tool.

[0002]

2. Description of the Related Art FIG. 10 shows a structure of a conventional tool holder capable of supplying a cutting fluid through the inside of the holder.

In this tool, a tool mounting hole 43 for mounting the tool 2 using a collet chuck 42 is provided at a tip end of a holder shank 41. Inside the holder shank 41, from the rear end of the shank to the tool mounting hole 43. Liquid supply hole 4 penetrating
4 is provided, and the back surface of the tool 2 is brought into contact with a stopper bolt 46 attached to the screw portion 45 of the liquid supply hole 44 to adjust the amount of protrusion of the tool 2.

In the above-described 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 of the tool 2 through the through hole 47 of the stopper bolt 46.
It is supplied to the tip position of the tool through an internal hole 2a formed inside the tool 2.

[0005]

In the tool holder having the above-mentioned structure, if there is a liquid leak between the liquid supply hole 44 and the stopper bolt 46, the cutting fluid will flow back inside the holder shank 41, and 2 causes a problem that stable supply of cutting fluid cannot be performed.

For this reason, the conventional stopper bolt 46 is
In order to improve the sealing property between the bolt and the liquid supply hole 44, the nut 4 is provided with an adhesive or the like in the middle of the screw portion 45 of the liquid supply hole 44.
8 is fixed in a liquid-tight manner, an adjusting bolt 50 is movably inserted into an internal hole 49 of the nut 48 via a seal ring 51, and a backflow of the cutting fluid is prevented by interposing a fixed nut 48. .

However, in the above-described bolt structure, the amount of movement of the adjustment bolt 50 is limited to the distance between the end of the screw portion 45 and the fixed nut 48, so that the screw portion 45
Cannot be adjusted over the entire length of the tool, and the amount of adjustment of the tool protrusion length is reduced.

In normal use, the thick nut 48 and the adjusting bolt 50 are in a state of being serially arranged in the axial direction through a predetermined gap 52, so that the entire axial space of the stopper bolt 46 becomes large. There is a problem that the total length of the holder shank 41 itself must be increased in order to obtain a required adjustment amount.

Further, in the structure in which the outer peripheral surface of the nut 48 is mechanically fixed to the liquid supply hole 44 with an adhesive or the like, it is difficult to completely seal the outer peripheral surface of the nut 48 in a liquid-tight state. There was also a problem that the backflow of the cutting fluid easily occurs due to the fluid leakage.

Accordingly, the present invention solves the above-mentioned problems, and can reliably prevent the backflow of the cutting fluid between the liquid supply hole and the stopper bolt, and can adjust the stopper bolt in a compact space. It is intended to provide.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a rear end portion of a stopper bolt is formed of an elastic material, and an outer peripheral surface of the elastic material is screwed to a screw portion of a liquid supply hole. In addition to forming the thread to be combined, a tapered pressure-receiving surface is provided on the rear end face of the elastic material, the diameter of which decreases toward the front from the rear end face.

According to a second aspect of the present invention, in the above structure, a pressing member is provided behind the elastic member of the stopper bolt, the pressing member being in full contact with a pressure receiving surface of the elastic material, and the pressing member is provided with a stopper. It was connected to the bolt movably in the front-rear direction.

[0013]

In the above structure, when the cutting fluid is supplied from the rear end of the liquid supply hole, the pressure of the cutting fluid acts on the pressure receiving surface of the elastic material of the stopper bolt, and the elastic material is formed by the tapered shape of the pressure receiving surface. Expands in diameter. By this diameter expansion, the thread of the elastic material is pressed against the thread of the liquid supply hole, and the position of the stopper bolt can be fixed and the outer periphery of the bolt can be sealed liquid-tight.

When the diameter of the elastic material is released from the expanded state, the thread of the elastic material and the pressure contact between the liquid supply hole are loosened. Therefore, by rotating the stopper bolt, the mounting position of the bolt can be changed.

On the other hand, in the second means, the pressure of the cutting fluid acts on the pressing member, and the pressing member presses the pressure receiving surface of the elastic material, thereby applying a force in the radial direction to the elastic material, thereby elastically deforming the elastic material. Let it.

[0016]

1 and 2 show a first embodiment of the present invention. The holder shank 1 is formed at the front end thereof with a tapered hole 4 into which a collet chuck 3 for holding a tool is fitted, and the collet chuck 3 fitted into the tapered hole 4.
Is pressed into the tapered hole 4 by the tightening nut 5, the collet chuck 3 is reduced in diameter, and the tool 2 inserted therein is held and fixed.

In the inside of the holder shank 1, a liquid supply hole 6 penetrating in the axial direction from the rear end to the tapered hole 4.
Are formed. The liquid supply hole 6 has a thread portion 7 for attaching a pull stud bolt on the rear end side, and a thread portion 8 for a stopper bolt on the front end side, and a stopper bolt 9 is attached to the thread portion 8. Have been.

The stopper bolt 9 is, as shown in FIGS. 1 and 2, a metal operating member 10 arranged on the front end side.
And an elastic member 11 disposed on the rear end side. A radial key 14 is engaged with grooves 12 and 13 formed on the end faces of the two members 10 and 11 to rotate the two members 10 and 11 together. It is stopped and formed so as to rotate integrally. The operation member 10 and the elastic member 11 may be prevented from rotating by bonding.

Threads 15 and 16 are formed on the outer peripheral surfaces of the operation member 10 and the elastic member 11 so as to be screwed into the screw portions 8 of the liquid supply holes 6, respectively. A through hole 17 serving as a passage is formed. A wrench groove 18 is formed at the front end of the through hole 17, and a seal ring 19 that seals the end surface of the through hole 17 where the operation member 10 and the tool 2 come into contact with each other is incorporated.

On the rear end surface of the elastic member 11, there is formed a conical pressure receiving surface 20 whose diameter decreases from the rear end to the front end. When pressure is applied to the pressure receiving surface 20, the elastic member 11 can be expanded.

The elastic member 11 is made of an elastic material such as urethane or synthetic rubber.

The tool holder of this embodiment has the above-described structure. When a cutting fluid is introduced at a predetermined pressure from the rear of the liquid supply hole 6 of the holder shank 1, the cutting fluid is first removed from the stopper bolt 9. It is strongly pressed against the pressure receiving surface 20 of the elastic member 11, and is introduced into the internal hole 2 a of the tool 2 through the through hole 17 of the operation member 10.

In this case, the elastic member 11 is expanded and deformed by the pressure of the cutting fluid acting on the pressure receiving surface 20, and the elastic member 11
The screw thread 16 on the outer peripheral surface is pressed against the screw portion 8 of the liquid supply hole 6. By the press-fitting of the thread 16 and the screw portion 8, liquid leakage from the outer periphery of the stopper bolt 9 is reliably prevented, and the movement of the stopper bolt 9 is fixed.

On the other hand, when the fixing position of the stopper bolt 9 is changed, the supply of the cutting fluid is stopped, the elastic deformation of the elastic member 11 is stopped, and the crimped state between the screw thread 16 and the screw portion 8 is released. In this state, a wrench jig is inserted into the wrench groove 18 of the through hole 17 of the operation member 10, and the stopper bolt 9 is rotated by the operation of the wrench jig to a required position.

FIGS. 3 and 4 show a second embodiment. In this example, a metal pressing member 21 is disposed behind the elastic member 11 of the stopper bolt 9 with respect to the first embodiment described above.

The pressing member 21 is composed of a pressing portion 22 and a connecting portion 23, and has a conical tapered surface 24 which makes surface contact with the pressing portion 21 over the entire circumference of the pressure receiving surface 20 of the elastic member 11.
Are formed.

A screw portion 25 is formed at the tip of the connecting portion 23, while a recess 26 having a screw portion 27 at the entrance is formed inside the operating member 10 of the stopper bolt 9. The screw portion 25 fits into the recess 26. The axial length of the concave portion 26 is set to be larger than the length of the screw portion 25, and the pressing member 21 is movable in the axial direction with respect to the stopper bolt 9 within the range of the difference in the length. It is connected to.

In the above-described structure, when the cutting fluid is introduced into the fluid supply hole 6, the pressing member 21 moves forward by receiving the pressure of the cutting fluid, and the tapered surface 24 moves to the pressure receiving surface 20 of the elastic member 11.
Crimp to Thereby, the elastic member 11 expands and deforms in diameter,
The screw thread 16 is pressed against the screw portion 8 of the liquid supply hole 6.

The cutting fluid is introduced into the recess 26 through the through hole 28 provided in the pressing member 21 and sent to the tool 2 side.

FIGS. 5 and 6 show a third embodiment. Although the basic structure and operation of this example are the same as those of the second embodiment, there is a difference in the connection structure between the stopper bolt 9 and the pressing member 21.

That is, in this example, the stopper bolt 9
A pin 31 in the radial direction is passed through the connecting portion between the operating member 10 and the elastic member 11, and the two members 10,
11 is stopped.

The connecting portion 23 of the pressing member 21 fitted into the operating member 10 is formed in a straight cylindrical shape, and the pin 31 is inserted into the axially long hole 32 provided in the connecting portion 23.
Through.

Thus, the pressing member 21 can be moved in the axial direction within the gap between the elongated hole 32 and the pin 31.
The elastic member 11 is pressed.

FIGS. 7 and 8 show a fourth embodiment. In this embodiment, an annular groove 33 is formed on the rear end surface of the pressing member 21 in the third embodiment.

By forming the annular groove 33 in this way, the surface area of the rear end face of the pressing member 21 is increased, and there is an advantage that the pressure of the cutting fluid can be efficiently received.

Instead of the annular groove 33, a plurality of independent grooves 34 are formed as shown in FIG.
The surface area under the pressure of 1 may be increased.

[0037]

As described above, according to the present invention, a stopper bolt is used for deforming an elastic material by the pressure of a cutting fluid and pressing the elastic material against a liquid supply hole by the deformation to seal and fix the outer periphery of the stopper bolt. Can be easily sealed and fixed by a single operation, liquid leakage between the liquid supply hole and the stopper bolt can be reliably prevented, and a stable tool holder can be used.

Further, since the stopper bolt has no component fixed to the liquid supply hole with an adhesive or the like and can be moved over the entire length of the screw portion of the liquid supply hole, the amount of adjustment of the projecting length of the tool can be increased. There are advantages.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment.

FIG. 2 is an exploded perspective view of the same stopper bolt.

FIG. 3 is a longitudinal sectional view showing a second embodiment.

FIG. 4 is an exploded perspective view of the same stopper bolt.

FIG. 5 is a longitudinal sectional view showing a third embodiment.

FIG. 6 is an exploded perspective view of the same stopper bolt.

FIG. 7 is a longitudinal sectional view showing a fourth embodiment.

FIG. 8 is a perspective view of the pressing member of the above.

FIG. 9 is a perspective view showing another example of the pressing member.

FIG. 10 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder shank 2 Tool 3 Collet chuck 6 Liquid supply hole 8 Screw part 9 Stopper bolt 10 Operating member 11 Elastic member 15, 16 Thread 17 Through hole 20 Pressure receiving surface 21 Pressing member 24 Tapered surface 26 Depression 33 Annular groove 34 Groove

Claims (2)

(57) [Claims] 1. A holder shank for mounting a tool is provided with a liquid supply hole penetrating the entire length of the holder, and a stopper bolt having a through hole is attached to a screw portion provided in the liquid supply hole. In a tool holder for adjusting the amount of protrusion of a tool by bringing the tool into contact, a rear end portion of the stopper bolt is formed of an elastic material, and a screw which is screwed to an outer peripheral surface of the elastic material with a screw portion of the liquid supply hole. A tool holder, wherein a ridge is formed, and a tapered pressure-receiving surface is provided on a rear end surface of the elastic material, the tapered pressure receiving surface decreasing in diameter from the rear end surface toward the front. 2. The rear part of the elastic material of the stopper bolt,
The tool holder according to claim 1, wherein a pressing member that makes full contact with the pressure receiving surface of the elastic member is arranged, and the pressing member is connected to the stopper bolt so as to be movable in the front-rear direction.