JP2002337011A - Tool rest device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact tool rest device capable of stably controlling a series of turret dividing operation. SOLUTION: A first servo motor 4 turns a turret 2 via pinion 6 and a ring gear 11. A second electric motor 5 deceleratingly and energizingly rotates a worm wheel 22 via worm 25a to move a feed screw 21 screwed with the worm wheel 22 in the turret turning axis direction. The feed screw 21 engages/ disengages a clutch 13 with/from the ring gear 11 and a toothed member 12 via a clutch holder 23 so as to clamp/unclamp the turret 2 to the tool rest 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool rest apparatus installed on a machine tool such as a lathe.

[0002]

2. Description of the Related Art Generally, a turret indexing operation in an NC machine tool such as a lathe is divided into a turret turning operation and a clamping operation. Conventionally, as a drive source of the turning operation,
Although the electric motor and the hydraulic motor are used properly according to the specification, the clamping operation requires a large thrust,
Hydraulic cylinders are widely used as the driving source.

[0003]

However, hydraulic cylinders generally have low response accuracy, making it difficult to stably control a series of turret indexing operations, and also serve as a heat source that causes thermal deformation of peripheral members. Another problem is that the hydraulic unit occupies a large installation space on or around the tool rest. In view of the above problems, an object of the present invention is to provide a compact tool rest apparatus capable of stably controlling a series of turret indexing operations.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a turret for holding a tool, a tool rest for rotatably supporting the turret, and a first turret for rotating the turret. An electric motor, a clutch for clamping and unclamping the turret with respect to the tool post, a switching mechanism for switching the clutch to the clamp and unclamping positions, a second electric motor for driving the switching mechanism, a first electric motor and a second electric motor Control means for synchronously controlling the motor.

According to a second aspect of the present invention, the switching mechanism comprises: a rotating body rotated by a second electric motor at a fixed position in a turret rotating axis direction; and a turret rotating screwed to the rotating body by rotation of the rotating body. It is characterized by including a feed screw that moves in the axial direction and a connecting member that connects the feed screw to the clutch.

According to a third aspect of the present invention, the rotating body is a worm wheel, the first electric motor is installed on the tool post parallel to the turret turning axis, and the second electric motor is connected to the turret turning axis. The worm is installed at a right angle, a worm shaft is connected to the output shaft of the second electric motor, and a worm meshing with the worm wheel is provided on the worm shaft.

According to a fourth aspect of the present invention, the connecting member includes a spring member for urging the clutch against the feed screw in the clamping direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tool rest apparatus according to the present invention will be described below in detail with reference to the drawings. First, the configuration of the tool rest apparatus 1 will be described with reference to FIGS. The turret device 1 includes a turret 2 for holding a tool, a turret 3 for rotatably supporting the turret 2, a first electric servomotor 4 for rotating the turret 2, and a turret 2 for the turret 2.
Clamp 13 for clamping and unclamping against
A switching mechanism for switching the clutch 13 to the clamp / unclamp position; a second electric servomotor 5 for driving the switching mechanism; and control means for synchronously controlling the first servomotor 4 and the second servomotor 5. Hereinafter, each component will be described.

The turning shaft 2a of the turret 2 is rotatably supported by the tool rest 3. A ring gear 11 is interposed between the turret 2 and the tool rest 3, and a toothed member 12 is fitted inside the ring gear 11. The ring gear 11 is fixed to the turret 2 and rotates together with the turret 2, and the toothed member 12 is
The turret side surfaces are formed with meshing portions in the same plane. On the other hand, the first servomotor 4 is installed on the tool post 3 in parallel with the turret rotation axis, and a pinion 6 that meshes with the ring gear 11 is attached to the output shaft 4a.

A feed screw 21 is provided around the turret pivot 2a.
Are supported rotatably about the pivot axis and slidably in the pivot axis direction. Outer peripheral screw 21a of feed screw 21
Is screwed into the inner peripheral screw 22a of the worm wheel 22. The worm wheel 22 is rotatably supported by the tool post 3 via a bearing 22b at a fixed position in the turret rotation axis direction, and the rotation of the worm wheel 22 allows the feed screw 21 to move in the turret rotation axis direction.

Around the feed screw 21, the turret 2
A stepped cup-shaped clutch holder 2 is provided between the
3 is inserted, and the ring gear 11 is
And a clutch 13 engaged with the toothed member 12 is fixed. A projection 23b is fixed to the inner periphery of the clutch holder 23, and an engagement portion 21b that engages with the projection 21b and pushes the clutch holder 23 toward the turret is fixed to the feed screw 21. A disc spring 24 is interposed between the engagement portion 21b and the clutch holder 23 as a spring member for urging the clutch 13 against the feed screw 21 in the clamping direction. A connection member that connects the feed screw 21 and the clutch 13 is constituted by the disc spring 24, the clutch holder 23, the protrusion 23b, and the engagement portion 21b.

As shown in FIG. 2, the second servomotor 5 is mounted on the tool rest 3 at right angles to the turret rotation axis, and the worm shaft 25 is coupled to the output shaft 5a of the coupling 2.
6. The worm shaft 25 is provided with a worm 25a that meshes with the worm wheel 22.
The second servo motor 5 switches the clutch 13 between the clamp position and the unclamping position via the worm 25a, the worm wheel 22, the feed screw 21, the clutch holder 23 and the like.

As shown in FIG. 3, the control means for synchronously controlling the first servo motor 4 and the second servo motor 5 comprises a processing section for calculating rotation command values of the servo motors 4 and 5 based on a turret indexing command. 31, a first servo control unit 32a and a first serve amplifier 33a for performing feedback control of the first servo motor 4, and a second servo control unit 32b and a second serve amplifier 33b for performing feedback control of the second servo motor 5 Have been.

The turret indexing operation of the tool rest apparatus 1 configured as described above will be described. When the turret indexing command is output, first, the second servomotor 5 rotates in one direction, and the worm wheel 2 is rotated via the worm 25a.
2, the feed screw 21 is moved to the turret side, and the clutch 13 is connected to the ring gear 11 and the toothed member 1.
2 and the turret 2 is unclamped from the tool rest 3. Next, the first servomotor 4 rotates, the turret 2 is turned via the ring gear 11, and the next tool is indexed to the cutting position.

Subsequently, the second servo motor 5 rotates in the reverse direction, the feed screw 21 is moved to the opposite side of the turret, the clutch 13 is engaged with the ring gear 11 and the toothed member 12, and
The turret 2 is clamped on the tool rest 3. At this time, since the disc spring 24 urges the clutch 13 in the clamping direction, the clutch 13 is prevented from being biased, and the turret 2
And the tool rest 3 can be securely clamped.

During the index control, the servo motors 4 and 5 are synchronously controlled at the timing shown in FIG. At the start of indexing (in the drawing), the second servo motor 5 for clamping is started in one direction, and the first servo motor 4 for turning is started in the middle of the unclamping operation (in the drawing). When the unclamping operation is completed (in the figure), the second servomotor 5 is stopped, the first servomotor 4 continues to rotate, and the second servomotor 5 is rotated in the reverse direction at the time when the turning operation is not completed (in the figure). Is activated. When the turning operation is completed (in the figure),
The first servomotor 4 is stopped, and the second servomotor 5 is decelerated in the middle of the clamping operation (FIG.). Then, the second servomotor 5 is stopped when the torque reaches the set value (in the figure), and a series of indexing operations is completed.

According to the tool rest apparatus 1 of this embodiment,
Since separate servo motors 4 and 5 are used as drive sources for the turret turning operation and the clamp operation, as described above, the turret turning operation and the clamp operation can be partially overlapped, and each operation can be accurately controlled. The time required for indexing the turret 2 can be reduced. In addition, by decelerating the second servomotor 5 immediately before the end of the clamp, the shock due to the contact at the time of clutch engagement is reduced, and together with the cushioning action of the disc spring 24, the clamp is performed based on the torque of the second servomotor 5. The operation can be properly terminated.

During the turning of the turret 2, the power supply to the second servomotor 5 is stopped by the self-locking function of the feed screw 21, the heat generation thereof is suppressed, the power consumption of the machine is reduced, and efficient motor control is achieved. It is possible. Further, unlike the hydraulic cylinder, heat deformation of peripheral machine elements due to heat generation does not occur, and the hydraulic unit can be omitted. In addition, since the first servomotor 4 and the second servomotor 5 are arranged at a right angle to each other, there is an advantage that they can be installed in a limited space of the tool rest 3 in a compact form. In addition, since the second electric motor 5 is connected to the feed screw 21 via the worm 25a and the worm wheel 22, a large clamping force can be obtained.

Note that the tool rest apparatus of the present invention is not limited to the above-described embodiment, but can be appropriately changed as exemplified below. (1) The types of the first and second electric motors are not particularly limited, but it is preferable to use a servomotor since each operation can be controlled accurately and with high accuracy. (2) In the power transmission means for transmitting the driving force of the second electric motor to the feed screw, not only a worm and a worm wheel but also a timing belt and a bevel gear may be used. In the case of a timing belt, a pulley as a rotating body is screwed into a feed screw. (3) Various spring members such as a coil spring and the like can be used as the connecting member. (4) In the case where the turret turning operation and the clamping operation are partially overlapped, the timing and the operation speed of the overlapping operation can be arbitrarily set, and the overlapping may be performed only when clamping or only when unclamping.

[0020]

As described above in detail, according to the first aspect of the present invention, since separate electric motors are used for the turning operation of the turret and the clamping operation, each operation can be controlled accurately. In addition, the clamping operation and the turret turning operation can be partially performed, thereby shortening the time required for turret indexing.

According to the second aspect of the present invention, the two electric motors can be efficiently controlled by utilizing the self-lock function of the feed screw.

According to the third aspect of the present invention, since the first electric motor and the second electric motor are arranged at right angles to each other, the two electric motors can be compactly installed in a limited space on the tool rest. Can be installed in Also,
Since the second electric motor is connected to the feed screw via the worm and the worm wheel, a large clamping force can be obtained.

According to the fourth aspect of the present invention, since the clutch is urged against the feed screw in the clamp direction, the clutch is prevented from being biased, and the turret and the tool rest can be reliably clamped.

[Brief description of the drawings]

FIG. 1 is an internal structural view of a tool rest apparatus according to an embodiment of the present invention.

FIG. 2 is a right side view of the tool rest device of FIG. 1;

FIG. 3 is a block diagram illustrating control means of the tool rest apparatus of FIG. 1;

FIG. 4 is a time chart illustrating operation timings of first and second electric motors in the tool rest apparatus of FIG. 1;

[Explanation of symbols]

1. Tool post device, 2. Turret, 2a.
3 ··· Tool post, 4 ··· First servo motor (first electric motor), 4a ··· Output shaft, 5 ··· Second servo motor (second
Electric motor), 5a ... output shaft, 6 ... pinion, 11
..Ring gears, 12 toothed members, 13 clutches, 21 feed screws, 21a outer peripheral screws, 21b
.Engaging portion, 22 .. worm wheel (rotating body), 22
a inner screw, 22b bearing, 23 clutch holder, 23b protrusion, 24 disc spring (spring member), 25 worm shaft, 25a worm, 2
6 coupling, 31 arithmetic processing unit, 32a
1st servo control unit, 32b... 2nd servo control unit, 33
a ... first servo amplifier, 33b ... second servo amplifier.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Kimura F-term in Okuma Co., Ltd. 5-25-25 Shimokoguchi, Oguchi-machi, Niwa-gun, Aichi Prefecture (reference) 3C028 EE12 3C046 NN14

Claims (4)

[Claims] 1. A turret for holding a tool, a tool rest for rotatably supporting the turret, and a first turret for rotating the turret.
An electric motor, a clutch for clamping and unclamping the turret with respect to the tool post, a switching mechanism for switching the clutch to the clamp and unclamping positions, a second electric motor for driving the switching mechanism, a first electric motor and a second electric motor A tool rest device comprising: a control unit that synchronously controls a motor. 2. A rotator rotated by a second electric motor at a fixed position in a turret rotation axis direction, and a feed screw screwed to the rotator and moved in the turret rotation axis direction by rotation of the rotator. The tool post device according to claim 1, further comprising: a connecting member that connects the feed screw to the clutch. 3. The rotator is a worm wheel, a first electric motor is installed on the tool rest parallel to the turret turning axis, and a second electric motor is installed at right angles to the turret turning axis. 3. The tool rest apparatus according to claim 1, wherein a worm shaft is connected to an output shaft of the motor, and a worm meshing with the worm wheel is provided on the worm shaft. 4. The coupling member includes a spring member for urging the clutch against the feed screw in a clamping direction.
The tool rest apparatus according to any one of the above.