JP6735211B2 - Center device - Google Patents

Description

The present invention relates to a center device provided with a center changer for connecting and disconnecting a tool holder and a rotation center provided in a multi-tasking machine or the like.

Conventionally, when processing the outer diameter of a rotating shaft work, it is known that one end is supported by a rotation center in order to prevent runout. Particularly, in a multi-tasking machine, since the rotation center is attached to the chuck for the work clamp, the rotation center needs to be precisely centered, and it is difficult to perform automatic exchange using an automatic tool changer (ATC). For this reason, the attachment and detachment of the rotation center requires manual replacement accompanied by machine stoppage, which hinders continuous operation.

Therefore, for example, as in Patent Documents 1 and 2, there is known a center device capable of automatically attaching and detaching a rotation center (see, for example, Patent Document 1).

JP, 2002-307207, A JP, 2004-160589, A

However, in Patent Document 1 described above, since only one side surface of the center is suppressed by the pin, it is not possible to sufficiently prevent the displacement of the rotation center when replacing the rotation center using the ATC. Further, in Patent Document 2, although the outer periphery of the center is pressed by a plurality of hard spheres, once the center is tilted, there is a problem that the tilt remains.

The present invention has been made in view of the above points, and an object of the present invention is to allow the ATC to be attached and replaced without tilting the rotation center.

In order to achieve the above object, in the present invention, the rotation center is supported by a pressing member that presses in the axial direction and a plurality of ball members that press inward in the radial direction.

Specifically, in the first invention, a rotation center detachably attached to the chuck,
A tool holder detachably attached to the tool magazine,
A center device having a center changer for connecting and disconnecting the tool holder and the rotation center is intended.

And the center changer is
A changer tip inserted into the central recess of the tool holder,
A disc portion continuous with the tip of the changer,
A cylindrical portion which is continuous with the disc portion, has an inner diameter larger than the maximum outer diameter of the rotation center, and is capable of accommodating the rotation center;
A pressing member that is inserted into the through hole at the tip of the changer and is urged toward the rotation center by a first urging member;
A second urging member that urges a ball member that is inserted into through holes provided at a plurality of positions of the cylindrical portion and abuts on the outer periphery of the rotation center is provided.

According to the above configuration, since the plurality of ball members press the outer circumference of the rotation center when inserting the rotation center into the cylindrical portion of the center changer, the rotation center is hard to tilt and is pushed by the first biasing member. Since the pressing member presses the rotation center toward the chuck, the rotation center becomes stable.

In a second invention, in the first invention,
The rotation center includes a conical tip portion and a columnar portion that is continuous with the bottom surface of the maximum outer diameter portion of the conical tip portion, and the ball member has the rotation center inserted into the center changer. It is provided at a position in contact with the bottom surface of the maximum outer diameter portion.

According to the above configuration, when the rotation center is inserted into the center changer, the conical tip end portion is pressed radially inward by the plurality of ball members during insertion, so that the rotation center is less likely to tilt. When the tip of the conical tip passes and the tip of the rotation center comes into contact with the pressing member, the bottom surface of the maximum outer diameter portion comes into contact with the ball member, so that the movement of the rotation center is restricted and the rotation center falls due to its own weight. Can be prevented.

In a third invention, in the first or second invention,
The plurality of ball members are provided at equal intervals on the same circumference of the center changer.

According to the above configuration, the ball member uniformly presses the outer periphery of the rotation center toward the inner side in the radial direction, so that the inclination of the rotation center can be effectively prevented.

As described above, according to the present invention, the rotation center is accommodated in the center changer while being pressed by the pressing member and the plurality of ball members, so that the rotation center can be tilted without using the ATC. Since it can be installed and replaced, uninterrupted operation can be performed for a longer period without disturbing continuous operation.

It is sectional drawing which shows the center apparatus in the state which the rotation center hold|gripped by the chuck was inserted in the center changer with which the tool holder was attached. It is a schematic diagram showing a part of compound processing machine containing a center device. It is a side view which shows a center changer.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a center device 1 according to an embodiment of the present invention. The center device 1 is provided, for example, in a multi-tasking machine 20. Although not shown in detail, the multi-tasking machine 20 is provided with a tool shaft 21 to which various tools are attached, and a pair of opposed chucks 22 and 23 for gripping a workpiece are provided on the axis X. .. The multi-tasking machine 20 also includes a tool magazine 24 that stores a plurality of various tools.

The center device 1 includes a rotation center 3 that is detachably attached to the one chuck 22, and a tool holder 4 that is detachably attached to the tool magazine 24. The tool holder 4 can be handled by using a known tool exchanging device 5 for exchanging tools with the tool magazine 24. Further, the center device 1 includes a center changer 10 capable of connecting and disconnecting the tool holder 4 and the rotation center 3.

As shown in FIG. 3, the center changer 10 also includes a cylindrical changer tip 11 that is inserted into the central recess 4 a of the tool holder 4. A side surface of the changer tip portion 11 is partially chamfered, and a through hole 11a having a circular cross section is formed at the center. Further, the center changer 10 is provided with a disc portion 12 which is continuous with the changer tip portion 11 and which can abut on the peripheral edge of the central concave portion 4a of the tool holder 4. Further, the center changer 10 is provided with a cylindrical portion 13 which is continuous with the disc portion 12, has an inner diameter larger than the maximum outer diameter of the rotation center 3, and can accommodate the rotation center 3. The inner diameter of the cylindrical portion 13 is slightly larger than the maximum outer diameter of the rotation center 3, and a difference of, for example, 0.05 mm is provided.

A spring receiving portion 11b having a small inner diameter is formed in the through hole 11a of the changer tip portion 11. A pin-shaped pressing member 15 biased toward the rotation center 3 by a first coil spring 14 serving as a first biasing member is axially movably inserted into the through hole 11a. The first coil spring 14 is fitted on the outer periphery of the cylindrical body of the pressing member 15, and is arranged between the disk-shaped head portion 15a and the disk-shaped retaining portion 15b. As a result, the first coil spring 14 has one end abutting on the spring receiving portion 11b and the other end abutting the pressing member 15, so that the pressing member 15 is biased to the rotation center 3 side with an appropriate force. ing.

In the middle portion of the cylindrical portion 13, for example, a plurality of oval-shaped lightening portions 13a that are long in the axial direction are arranged at equal intervals in the circumferential direction. On the rotation center 3 side of this lightening 13a, for example, ball through holes 13b are provided at six locations evenly in the circumferential direction. This lightening 13a is for the purpose of reducing the weight and may be omitted. Each ball through hole 13b is a through hole having a circular cross section that extends in the radial direction of the center changer 10, and a ball member 16 that abuts the outer circumference of the rotation center 3 is provided on the inside in the radial direction. A second coil spring 17 as a second biasing member for biasing the ball member 16 is built in the ball through hole 13b. The second coil spring 17 abuts on the ball member 16 via the receiving washer 18, and the ball through hole 13 b is closed by the embedded screw 19. The radially inner end of the ball through hole 13b has a diameter smaller than the outer diameter of the ball member 16 so that the ball member 16 does not pop out. As described above, six ball members 16 are provided at equal intervals on the same circumference of the center changer 10, and each of them is biased inward in the radial direction. The ball member 16 is made of, for example, a hard metal having a diameter of 4.5 mm, and protrudes from the ball through hole 13b by, for example, 1.4 mm in a state where no force is applied from the inside in the radial direction.

The rotation center 3 includes a conical tip portion 3a and a cylindrical portion 3b continuous with the maximum outer diameter portion bottom surface 3c of the conical tip portion 3a. The ball member 16 is provided at a position where it comes into contact with the maximum outer diameter portion bottom surface 3c in a state where the rotation center 3 is inserted into the center changer 10. The shape of the rotation center 3 is not limited to this, but the shape of the center changer 10 may be set according to the shape of the rotation center 3.

Next, the operation of the center device 1 according to the present embodiment will be described. Specifically, the work of removing the rotation center 3 after processing the workpiece will be described.

First, the tool changer 5 having the center changer 10 attached to the tool holder 4 is called from the tool magazine 24.

Next, as shown in FIG. 2, the tool changing device 5 is rotated in the tool axis direction.

Next, the tool changer 5 is lowered to the position of the tool shaft, and brought close to the position of the rotation center 3 gripped by the chuck 22.

Then, the center changer 10 is pushed toward the rotation center 3 until the ball member 16 contacts.

Next, all the six ball members 16 pass through the maximum outer diameter portion of the rotation center 3 and contact the bottom surface 3c of the maximum outer diameter portion. As a result, the rotation center 3 is securely fixed to the center changer 10.

Then, the chuck 22 is unclamped, so that the rotation center 3 remains on the center changer 10 side. At this time, the rotation center 3 is evenly pushed by the six ball members 16 and held at the center of the center changer 10.

Next, the tool changer 5 moves away from the chuck 22 and moves to the position of the tool magazine 24.

Next, the tool changer 5 turns while holding the rotation center 3. At this time, since the bottom surface of the maximum outer diameter portion is in contact with the six ball members 16, it is possible to prevent the rotation center 3 from dropping due to its own weight.

Then, the tool changer 5 fits the center changer 10 and the tool holder 4 together with the rotation center 3 into the tool magazine 24.

On the other hand, when the tool changer 5 grips the rotation center 3 and attaches it to the chuck 22, the procedure reverse to the above may be performed. When the rotation center 3 is left on the chuck 22, the center changer 10 is moved to the opposite side of the chuck 22 so that the six ball members 16 are pushed back against the biasing force of the second coil spring 17, and the maximum outer diameter of the rotation center 3 is increased. It suffices to pass the part and separate it.

As described above, in the present embodiment, when the rotation center 3 is inserted into the cylindrical portion 13 of the center changer 10, the plurality of ball members 16 press the outer circumference of the rotation center 3 and are pressed by the first coil spring 14. Further, since the pressing member 15 presses the rotation center 3 toward the chuck 22, the rotation center 3 is less likely to tilt and is held in a stable state. The six ball members 16 evenly arranged in the circumferential direction press the bottom surface 3c of the maximum outer diameter portion of the rotation center 3 with an even force after the passage of the maximum outer diameter portion, and the pressing member 15 axially rotates the rotation center 3. Since the rotation center 3 is pressed, the rotation center 3 is securely mounted on the axis X and does not tilt.

That is, in the present embodiment, when the rotation center 3 is inserted into the center changer 10, the conical tip portion 3a is pressed radially inward by the plurality of ball members 16 during insertion, so that the rotation center 3 is Hard to lean. When the conical tip 3a passes and the tip of the rotation center 3 comes into contact with the pressing member 15, the maximum outer diameter portion bottom surface 3c comes into contact with the ball member 16, so that the movement of the rotation center 3 is restricted. It is possible to prevent the rotation center 3 from dropping due to its own weight. Moreover, in the present embodiment, the ball member 16 uniformly presses the outer periphery of the rotation center 3 toward the inner side in the radial direction, so that the rotation center 3 is less likely to tilt.

Therefore, according to the center device 1 of this embodiment, the rotation center 3 is housed in the center changer 10 while being pressed by the pressing member 15 and the plurality of ball members 16. Since the center 3 can be attached and replaced without tilting, continuous operation is not hindered and unmanned operation can be performed for a longer time.

(Other embodiments)
The present invention may have the following configurations in the above embodiment.

That is, in the above embodiment, six ball members 16 are provided on the same circumference of the center changer 10 at equal intervals, but the number thereof is not particularly limited and may be four or more. However, it is better to increase the number of rotation centers with a large outer diameter in order to increase the regulation of movement.

Further, in the above embodiment, the spherical ball member 16 pushes the outer periphery of the rotation center 3, but the rotation center 3 may be pushed by a pin member having a hemispherical tip. However, since the spherical ball member 16 itself rotates, the rotation center 3 can be attached and detached more easily.

The above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, and uses.

1 Center device
3 rotation center
3a Conical tip
3b Column part
3c bottom surface of maximum outer diameter
4 Tool holder
4a central recess
5 Tool changer
10 Center changer
11 Changer tip
11a through hole
11b Spring receiving part
12 disk part
13 Cylindrical part
13a meat removal
13b Ball through hole
14 First coil spring
15 Pressing member
15a disk-shaped head
15b Disc-shaped retaining part
16 ball members
17 Second coil spring
18 Receiving washer
19 Embedded screws
20 Multi-tasking machine
21 Tool axis
22,23 chuck
24 tool magazine

Claims (3)

A rotation center that is detachably attached to the chuck,
A tool holder detachably attached to the tool magazine,
A center device comprising a center changer for connecting and disconnecting the tool holder and the rotation center,
The center changer is
A changer tip inserted into the central recess of the tool holder,
A disc portion continuous with the tip of the changer,
A cylindrical portion which is continuous with the disc portion, has an inner diameter larger than the maximum outer diameter of the rotation center, and is capable of accommodating the rotation center;
A pressing member that is inserted into the through hole at the tip of the changer and is urged toward the rotation center by a first urging member;
A center device, comprising: a second biasing member that is inserted into through holes provided at a plurality of positions of the cylindrical portion and that biases a ball member that abuts the outer periphery of the rotation center. The center device according to claim 1,
The rotation center includes a conical tip portion and a columnar portion that is continuous with the bottom surface of the maximum outer diameter portion of the conical tip portion, and the ball member has the rotation center inserted into the center changer. A center device provided at a position in contact with the bottom surface of the maximum outer diameter portion. The center device according to claim 1 or 2,
A center device, wherein a plurality of the ball members are provided at equal intervals on the same circumference of the center changer.

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