JP2561178Y2 - Tool holder fixing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure capable of precisely aligning a tool holder to a tip of a spindle of a boring machine tool or the like.

[0002]

2. Description of the Related Art Conventionally, in a boring machine tool, for example, a type shown in FIG. 6 is known as a mounting structure for mounting a detachable tool holder at a tip end of a spindle. That is, a mounting hole 52 is provided on the end surface 51a of the spindle 51, while a shank portion 53c is provided on a fixed reference surface 53b of the tool holder 53.
Is provided. Both the inner surface of the mounting hole 52 and the outer surface of the shank portion 53c are formed straight in parallel along the axial direction, and are formed to have substantially the same diameter so that they are closely fitted and fitted. And the tool holder 53
When mounting the bracket, the shank portion 53c is inserted into the mounting hole 52, and then the socket bolt 54 is tightened and fixed from the tool holder 53 side. In addition, 55 is a blade part in the figure. However, it is necessary to mount the tool holder 53 in a state where the centering accuracy is secured in order to increase the machining accuracy. With a fixing device of the type described above, it is necessary to work manually to secure the runout accuracy and the tool insertion / removal accuracy. Because of the need for experience, it is known that the outer surface of the shank portion 53c and the inner surface of the mounting hole 52 are tapered. That is, the shank portion 53c is provided with a taper having a small diameter on the side of the shank 53c along the axial direction, and the mounting hole 52 is provided with a taper of substantially the same shape having a small diameter on the deep portion side. To prevent it from being attached.

[0003]

However, in order to bring both tapered surfaces into close contact with the end surfaces 51a and 53b of the two at the same time by using the above-described apparatus, the tapered surfaces and the like are processed with very high precision. In addition, there is a problem that the type of material is limited in order to prevent the accuracy from being lowered due to wear or the like. On the other hand, a device such as a so-called petal holder, which has a special function of improving the axial accuracy at the time of mounting, is also known in part, but has a disadvantage that it is very expensive.

[0004]

In order to solve the above-mentioned problem, the present invention provides a shutter provided on the reference surface 3b of the tool holder 3.
Mounting hole 2 provided on the end face 1a of the spindle 1
A fixing device for inserting and fixing
The outer diameter of the portion 3c is smaller than the inner diameter of the
Between the outer peripheral surface of the shank portion 3c in the inserted state and the inner peripheral surface of the mounting hole 2.
A cylindrical fitting gap S is formed therebetween, and the inner surface or
Either side of the outer surface of the junk portion 3c is parallel to the axial direction.
And the other side is inclined from the axial direction to
The width of S is changed in the axial direction, and
A collet 5 for centering is interposed so as to be movable along
In the fixing device of the tool holder , the tool holder 3
An axially movable clamp that supports the rear end of collet 5
A lamp member 10 is provided.
The rectangular hole 11 is provided, and the rectangular hole 11 is
To move the clamp member 10 in the axial direction
Characterized in that the screw pin 12 to be moved is engaged.
I do. Alternatively, the tool holder 33 is located at the rear end of the collet 5.
A clamp member 30 supporting the surface side and movable in the axial direction is provided.
The tip of the clamp member 30 is
It is screwed into the screw part 34 provided on the shaft center on the tip side.
And

[0005]

The collet is moved in the axial direction in the fitting gap and is centered by the collet. In this case, either the inner or outer surface of the fitting interval gap by changing the width of the interval gap fitting a tapered shape in the axial direction, moving of the collet in the fitting interval within gap
Therefore , close contact between the mounting hole of the spindle and the shank portion of the tool holder is achieved, and the centering accuracy is improved. For moving the collet axially of the tool holder attachment and detachment is facilitated since only set the Sukuryupin which advances and retreats in the axial direction and orthogonal direction. Or, move the collet in the axial direction.
Screw the clamp member into the thread of the tool holder,
The tool holder is moved forward and backward by rotating the clamp member.
The tool holder is easy to attach and detach.
You.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tool holder fixing device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing one embodiment of a tool holder fixing device, FIG. 2 is a front view thereof, and FIG. 3 is a perspective view of a collet.

For example, in a boring machine tool, as shown in FIG. 1, a tool holder 3 is detachable from a spindle 1, and the fixing device of the present invention is adopted as a mounting structure of the tool holder 3. .

That is, a mounting hole 2 is provided in the end surface 1a of the spindle 1 along the axis, and the mounting hole 2 is formed in the end surface 1a.
The side is a circular small-diameter hole 2a, the inner side at the back is a large-diameter hole 2b via the step P, and the inner surface of the small-diameter hole 2a is formed as a straight hole parallel to the axial direction. I have.

On the other hand, the tool holder 3 has a large diameter portion 3a and a shank portion 3c provided on a reference surface 3b on the end face of the large diameter portion 3a. The shank portion 3c is configured as a cylindrical protrusion having a smaller diameter than the mounting hole 2, and the outer surface is a tapered surface T which is tapered and inclined in the axial direction.

Therefore, when the shank portion 3c of the tool holder 3 is inserted into the mounting hole 2, a fitting gap S having a different width in the axial direction is formed between the inner surface of the mounting hole 2 and the outer surface of the shank portion 3c. As a result, a collet 5 described later is interposed in the fitting gap S.

A guide hole 6 is provided in the shank 3c of the tool holder 3 along the axis. A small-diameter screw portion 7 is provided at the back of the guide hole 6 at the center of the shaft. Are in communication.

A clamp rod 10 as a clamp member is inserted into the guide hole 6. The clamp rod 10 has substantially the same diameter as the guide hole 6 and is slidable in the guide hole 6. The clamp rod 10 has a flange portion 10 a at one end and a right-angled hole 11 penetrating at a predetermined position in the axial direction. ing. In the embodiment, a taper 11a is provided at one end of the right-angled hole 11 so as to expand outward.

The diameter of the flange 10a is larger than the diameter of the end of the shank 3c and smaller than the diameter of the small-diameter hole 2a of the mounting hole 2 so that the flange 10a can abut on one end of the collet 5 described later.

A screw pin 12 is provided in the through hole 8. That is, the screw portion 8a is provided at the entrance side of the through hole 8.
The screw portion 12a of the screw pin 12 is screwed into the screw portion 8a, and a tapered portion t is provided at the tip of the screw pin 12. And this taper part t is the taper 11 of the right-angled hole 11 of the clamp rod 10.
a is inserted from the opening on the formation side, and
1 is in contact with the inner surface at one axial end. Then, a pressing force to move the clamp rod 10 to the inside of the guide hole 6 can be given by the advance of the screw pin 12.

The clamp rod 10 in the guide hole 6
For the movement of the screw pin 12, the tip of the screw pin 12 is
Since the clamp rod 10 is inserted inside the clamp rod 1 , the clamp rod 10 does not rotate around the axis. However, a separate key member for preventing rotation may be provided.

The tool holder 3 constructed as described above has its reference surface 3b brought into contact with the end surface 1a of the spindle 1 and, as shown in FIG. It will be.

Next, as shown in FIG. 3, the collet 5 has a cylindrical shape in which the thickness n changes in the axial direction so that one end is thicker and the other end is thinner. Are provided with slit grooves 13,. The change in the thickness n is formed by making the inner peripheral surface an inclined surface with respect to the outer peripheral surface, which is a straight surface, so as to correspond to the axial width change of the fitting gap S.

For this reason, the collet 5 can be closely inserted into the fitting gap S. When the collet 5 moves in the fitting gap S in the axial direction,
The tapered surface T of the shank portion 3c is in close contact with the mounting hole 2 via the collet 5, and the tool holder 3 is precisely centered with respect to the axis of the spindle 1.

In the fixing device configured as described above,
When the screw pin 12 is advanced as described above, the clamp rod 10 is pushed into the guide hole 6 inward by the tapered portion t at the tip, and the collet 5 is also pushed by the flange portion 10a and is spread by the tapered surface T. However, when attaching the tool holder 3, the screw pin 12 is loosened.

That is, by loosening the screw pin 12, the diameter of the collet 5 is in a contracted state, and the collet 5 can be easily inserted into the mounting hole 2. After insertion, the socket is lightly temporarily tightened with several socket bolts 4.

Then, when the screw pin 12 is tightened, the clamp rod 10 is pushed into the guide hole 6 and the tool holder 3 is precisely centered by the expansion and close contact of the collet 5 with which the clamp rod 10 is drawn. That is, the inner surface is in close contact with the tapered surface T, and the outer peripheral portion of the collet 5 is about to be pushed and widened within the clearance range. At this time, when the centering is completed, the end surface 1a of the spindle 1 is in contact with the reference surface 3b of the tool holder 3. When the centering is completed, the temporarily tightened socket bolt 4 is tightened.

Next, a second embodiment of the present invention will be described with reference to FIG.

This embodiment uses a mounting hole 22 on the spindle 1 side.
Is a reverse taper, and the shank portion 23c of the tool holder 23 is formed.
Is formed as a straight overhang, and the shape of the fitting gap S is reversed from that of the above embodiment.

That is, a ring-shaped mounting member 21 is mounted on the end surface of the spindle 1 with a plurality of mounting bolts 24. The small-diameter hole portion 22a on the inner surface of the mounting member 21 is tapered so that the outside is narrowed. The mounting hole 22 is formed by providing a large-diameter hole portion 22b having a larger diameter than the small-diameter hole portion 22a on one end face.

On the other hand, the shank portion 23 of the tool holder 23
The outer surface of c is parallel to the axial direction and is a straight surface.

Therefore, the shank 23c and the small-diameter hole 2
2a, there is a cylindrical annular gap S having a different width in the axial direction.
However, the shape of the annular gap S has a tapered portion on the outer surface side, contrary to the shape shown in FIG.

The shape of the collet 25 has a tapered portion on the outer surface in accordance with this, but the other configuration is the same as that of the above-described example. That is, the guide hole 6 is provided in the tool holder 23 to make the clamp rod 10 slidable.
A configuration in which the end face of the collet 25 is supported by Oa, a configuration in which the tapered portion t of the screw pin 12 is engaged with the right-angled hole 11 provided in the clamp rod 10, and the like.

Even in such a configuration, the collet 25 is pulled in similarly to the above, whereby the shank portion 23c is brought into close contact with the small-diameter hole portion 22a, and precise centering is performed.

The reason why the mounting hole 22 is formed by the mounting member 21 is to take into account the difficulty of processing the reverse taper, and it is a matter of course that the mounting hole 22 may be formed directly on the end face of the spindle 1. .

Next, another embodiment of the mechanism for moving the clamp rod 10 will be described with reference to FIG.

In this embodiment, a screw hole 34 is drilled along the axis on the distal end side of the tool holder 33 and penetrates toward the distal end surface.
In this configuration, the screw portion 30a at the leading end is screwed.

Further, a hexagonal tightening hole 30b for a hexagonal wrench R, for example, is provided on the distal end surface of the screw portion 30a of the clamp rod 30.

For this reason, in this configuration, the clamp rod 30 is turned by the hexagon wrench R to
Numeral 0 advances by the screw action, and at the same time, the collet 5 advances to obtain the same centering effect as described above. still,
In the above figures, 15 is a blade portion.

[0034]

As described above, the tool holder fixing device of the present invention provides a fitting gap between the mounting hole and the shank,
Since the collet disposed in the fitting gap is centered so as to be movable, it is possible to mount a tool holder which is frequently attached and detached with a simple operation in a state where the centering is performed in a short time. Operation time can be shortened. In addition, the conventional manual assembling required work experience and skill to secure the accuracy such as runout accuracy, tool insertion / removal accuracy, etc., but the present invention does not depend on such experience etc. Can be obtained. Further, according to the present invention, there is an advantage that the cost can be reduced because the current tool holder can be used almost as it is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a tool holder fixing device.

FIG. 2 is a front view of the same.

FIG. 3 is a perspective view of a collet.

FIG. 4 is a sectional view showing another embodiment of the fixing device.

FIG. 5 is a sectional view showing another embodiment of the moving mechanism of the clamp rod.

FIG. 6 is a sectional view of a conventional fixing device.

[Explanation of symbols]

 Reference Signs List 1 spindle 2 mounting hole 3 tool holder 3c shank part 5 collet 10 clamp rod 11 right-angled hole 12 screw pin S fitting gap

Claims (2)

(57) [Scope of request for utility model registration] 1. A shank portion provided on a reference plane of the tool holder a fixing device for fixing crowded difference mounting hole provided in the end face of the spindle, than the inner diameter of the mounting hole of the outer diameter of the shank portion A cylindrical fitting gap is formed between the outer peripheral surface of the inserted shank portion and the inner peripheral surface of the mounting hole by reducing the amount by a predetermined amount , and either the inner surface of the mounting hole or the outer surface of the shank portion is formed .
One side is parallel to the axial direction, and the other side is
To change the width of the fitting gap in the axial direction.
Because, in the fixing device of the meta toolholder Shi intervening collet for movably centering along the axial direction in the fitting interval within gap
The tool holder supports a rear end surface of the collet.
And a clamp member that is movable in the axial direction.
In addition to providing a right-angled hole at right angles to the
The clamp member moves back and forth in the right-angled hole in the direction perpendicular to the axial direction.
A screw pin for moving the tool holder in the axial direction is engaged . 2. A shank provided on a reference surface of a tool holder.
Part into the mounting hole provided on the end face of the spindle.
Fixing device for measuring the outer diameter of the shank portion.
Inserted shank with a predetermined amount smaller than the bore diameter
Forming a cylindrical fitting gap between the outer peripheral surface of the part and the inner peripheral surface of the mounting hole
Either the inner surface of the mounting hole or the outer surface of the shank
One side is parallel to the axial direction, and the other side is
To change the width of the fitting gap in the axial direction.
To be axially movable within this fitting gap.
Tool holder fixing device with a collet
The tool holder supports a rear end surface of the collet.
And a clamp member that is movable in the axial direction.
The tip of the stopper member is provided on the axis on the tip side of the tool holder.
A tool holder fixing device, which is screwed into a screw portion .