JP2018069423A - Center device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to perform attachment and displacement by use of an ATC without inclination of a rotation center.SOLUTION: A center changer 10 is provided with: a changer tip 11 which is inserted in a center recess part of a tool holder 4; a circular disk part 12 which is continuous with the tip; a cylindrical part 13 which is continuous with the circular disk part 12, has an inner diameter smaller than a maximum outer diameter of the rotation center 3, and can accommodate the rotation center 3; a pressing component 15 which is inserted in an open hole of the changer tip 11 and is energized to the rotation center 3 side by a first coil spring 14; and a second coil spring 17 which is inserted in an open hole provided at plural locations of the cylindrical part 13, and energizes a ball member 16 which contacts an outer periphery of the rotation center 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a center device including a center changer that couples and separates a tool holder and a rotation center provided in a multi-task machine or the like.

  Conventionally, when machining the outer diameter of a rotating shaft workpiece, it is known that one end is supported by a rotation center to prevent the deflection. In particular, in a multi-task machine, a rotation center is attached to a chuck for work clamping, so the rotation center needs to be precisely centered, and automatic change using an automatic tool changer (ATC) is difficult. For this reason, the attachment / detachment of the rotation center is a manual replacement accompanied by a machine stop, which hinders continuous operation.

  Therefore, for example, as in Patent Documents 1 and 2, a center device that can automatically attach and detach the rotation center is known (see, for example, Patent Document 1).

JP 2002-307207 A JP 2004-160589 A

  However, in the above-mentioned Patent Document 1, since only one side of the center is suppressed by a pin, it is not possible to sufficiently prevent the rotation center from being displaced when the rotation center is replaced using the ATC. Moreover, in the thing of patent document 2, although the outer periphery of a center is pressed with a some hard sphere, once a center inclines, there exists a problem that an inclination remains as it is.

  The present invention has been made in view of this point, and an object of the present invention is to enable attachment and replacement using an ATC 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 that is detachably attached to the chuck;
A tool holder detachably attached to the tool magazine;
A center apparatus including a center changer that couples and separates the tool holder and the rotation center is an object.

And the center changer is
A changer tip inserted into the central recess of the tool holder;
A disc part continuous to the tip of the changer;
A cylindrical portion that is continuous with the disc portion, has an inner diameter smaller than the maximum outer diameter of the rotation center, and can accommodate 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 the first urging member;
And a second urging member that urges a ball member that is inserted into through holes provided at a plurality of locations of the cylindrical portion and contacts the outer periphery of the rotation center.

  According to the above configuration, since the plurality of ball members press the outer periphery of the rotation center when the rotation center is inserted into the cylindrical portion of the center changer, the rotation center is not easily tilted and is pressed by the first urging member. Since the pressing member presses the rotation center toward the chuck, the rotation center is stabilized.

In the second invention, in the first invention,
The rotation center includes a conical tip portion and a cylindrical portion continuous to a bottom surface of the maximum outer diameter portion of the conical tip portion, and the ball member is inserted in 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 portion is pressed radially inward by the plurality of ball members during the insertion, so that the rotation center is not easily tilted. 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 by its own weight. Can be prevented.

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

  According to said structure, since a ball member presses the outer periphery of a rotation center equally toward radial inner side, the inclination of a rotation center can be prevented effectively.

  As described above, according to the present invention, since the rotation center is accommodated in the center changer while being pressed by the pressing member and the plurality of ball members, the rotation center is not tilted using the ATC. Since it can be mounted and replaced, it does not hinder continuous operation, and unmanned operation can be carried out for a longer time.

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

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a center device 1 according to an embodiment of the present invention, and this center device 1 is provided in, for example, a multi-task machine 20. Although not shown in detail, the multi-task 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. . Further, the multi-task machine 20 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 one chuck 22 and a tool holder 4 that is detachably attached to the tool magazine 24. The tool holder 4 can be handled using a known tool changer 5 for exchanging tools with the tool magazine 24. Further, the center device 1 includes a center changer 10 that can couple and separate the tool holder 4 and the rotation center 3.

  As shown in FIG. 3, the center changer 10 includes a columnar changer tip 11 that is inserted into the central recess 4 a of the tool holder 4. The changer tip 11 is partially chamfered at the side, and a through hole 11a having a circular cross section is formed at the center. Further, the center changer 10 includes a disk portion 12 that is continuous with the tip end portion 11 of the changer and that can contact the peripheral edge of the central recess 4 a of the tool holder 4. Further, the center changer 10 includes a cylindrical portion 13 that is continuous with the disc portion 12, has an inner diameter smaller 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, for example, a difference of 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 urged toward the rotation center 3 by a first coil spring 14 as a first urging member is inserted into the through hole 11a so as to be movable in the axial direction. The first coil spring 14 is fitted on the outer periphery of the cylindrical main body of the pressing member 15 and is disposed between the disc-shaped head portion 15a and the disc-shaped retaining portion 15b. As a result, the first coil spring 14 comes into contact with the spring receiving portion 11b and the other end contacts the pressing member 15, thereby urging the pressing member 15 toward the rotation center 3 with an appropriate force. ing.

  In the intermediate portion of the cylindrical portion 13, for example, a plurality of oval thinnings 13a that are long in the axial direction are arranged at equal intervals in the circumferential direction. For example, six through holes 13b for balls are provided in the circumferential direction at six locations on the rotation center 3 side of the lightening 13a. This lightening 13a is for the purpose of weight reduction and may not be present. Each ball through-hole 13 b is a through-hole having a circular cross section extending in the radial direction of the center changer 10, and a ball member 16 that abuts the outer periphery of the rotation center 3 is provided on the inner side in the radial direction. A second coil spring 17 as a second urging member that urges the ball member 16 is incorporated in the ball through-hole 13b. The second coil spring 17 is in contact with the ball member 16 via a receiving washer 18, and the ball through hole 13 b is closed with an embedded screw 19. The radially inner end of the ball through-hole 13b has a smaller diameter than the outer diameter of the ball member 16 so that the ball member 16 does not jump out. As described above, six ball members 16 are provided at equal intervals on the same circumference of the center changer 10, and each is urged radially inward. The ball member 16 is made of a hard metal having a diameter of 4.5 mm, for example, and protrudes, for example, 1.4 mm from the ball through hole 13b 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 to the bottom surface 3c of the maximum outer diameter portion of the conical tip portion 3a. The ball member 16 is provided at a position in contact with the bottom surface 3c of the maximum outer diameter portion 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 this embodiment will be described. Specifically, the removal work of 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 changer 5 is turned in the tool axis direction.

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

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

  Next, all six ball members 16 pass through the maximum outer diameter portion of the rotation center 3 and come into contact with the bottom surface 3c of the maximum outer diameter portion. Thereby, the rotation center 3 is reliably fixed to the center changer 10.

  Next, 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 pushed evenly 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 falling due to its own weight.

  Next, 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 reverse procedure 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 as to push back the six ball members 16 against the urging force of the second coil spring 17. What is necessary is just to let a part pass and to detach | leave.

  As described above, in this 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 periphery of the rotation center 3 and are pressed by the first coil spring 14. Since the pressing member 15 presses the rotation center 3 toward the chuck 22, the rotation center 3 is difficult to tilt and is held in a stable state. The six ball members 16 arranged uniformly in the circumferential direction hold the bottom surface 3c of the maximum outer diameter portion of the rotation center 3 with an equal force after passing through the maximum outer diameter portion, and the pressing member 15 extends in the axial direction in the rotation center 3 The rotation center 3 is securely mounted on the axis X and does not tilt.

  That is, in this 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 the insertion. It is hard to tilt. Then, when the conical tip 3a passes and the tip of the rotation center 3 comes into contact with the pressing member 15, the bottom surface 3c of the maximum outer diameter comes into contact with the ball member 16, so that the movement of the rotation center 3 is restricted. The rotation center 3 can be prevented from falling by its own weight. In addition, in the present embodiment, the ball member 16 presses the outer periphery of the rotation center 3 evenly radially inward, so that the rotation center 3 is difficult to tilt.

  Therefore, according to the center device 1 according to the present embodiment, the rotation center 3 is accommodated in the center changer 10 while being pressed by the pressing member 15 and the plurality of ball members 16, so that the rotation is performed using the ATC. Since the center 3 can be mounted 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 be configured as follows with respect to the above embodiment.

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

  Moreover, in the said embodiment, although the outer periphery of the rotation center 3 is pushed with the spherical ball member 16, you may make it push the rotation center 3 with a pin member with a hemispherical tip. However, since the spherical ball member 16 itself rotates, the detachment of the rotation center 3 is further facilitated.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Center device
3 Rotation center
3a Conical tip
3b cylinder
3c Maximum outer diameter bottom
4 Tool holder
4a Center recess
5 Tool changer
10 Center changer
11 Changer tip
11a Through hole
11b Spring receiving part
12 Disc part
13 Cylindrical part
13a without meat
13b Through hole for ball
14 First coil spring
15 Pressing member
15a Disc head
15b Disc-shaped retaining part
16 Ball member
17 Second coil spring
18 Washer
19 Embedded screw
20 Multi-task machine
21 Tool axis
22, 23 Chuck
24 Tool magazine

Claims (3)

A rotation center detachably attached to the chuck;
A tool holder detachably attached to the tool magazine;
A center device comprising a center changer for coupling and separating the tool holder and the rotation center,
The center changer
A changer tip inserted into the central recess of the tool holder;
A disc part continuous to the tip of the changer;
A cylindrical portion that is continuous with the disc portion, has an inner diameter smaller than the maximum outer diameter of the rotation center, and can accommodate the rotation center;
A pressing member that is inserted into the through hole at the tip of the changer and is biased toward the rotation center by the first biasing member;
A center device comprising: a second urging member that urges a ball member that is inserted into through holes provided at a plurality of locations of the cylindrical portion and abuts on an outer periphery of the rotation center. The center device according to claim 1,
The rotation center includes a conical tip portion and a cylindrical portion continuous to a bottom surface of the maximum outer diameter portion of the conical tip portion, and the ball member is inserted in 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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