JP3928096B2 - Tilting table device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tilting table device that is used in a machine tool and supports a rotary table that holds a workpiece and includes a tilting table that is tilted around a horizontal axis by a horizontal turning shaft.
[0002]
[Prior art]
In this type of tilting table device, the driving force of a drive source such as a servomotor is transmitted to the horizontal turning shaft via the transmission device, and the tilting table is tilted around the horizontal axis by rotating the horizontal turning shaft by a predetermined angle. It is made to be made to do.
[0003]
By the way, when the tilt table is tilted around the horizontal axis, a torque in the direction opposite to the rotation direction of the horizontal swing axis acts on the horizontal swing axis, and as a result, the tilt table cannot be positioned with high accuracy. There was a problem. In addition, there is a problem that a large load is applied to the transmission device and the drive source, and they are damaged in a short period of time. In addition, there is a problem that the capacity of the drive source has to be increased and the size is increased.
[0004]
In order to solve such problems, a direct acting hydraulic cylinder that applies torque to the horizontal swing axis is provided, and the balance of the force acting on the horizontal swing axis when the tilt table is tilted is adjusted. It made that it is inclined device is known (see Japanese Unexamined Utility Model Publication No. 63 -7422 and JP No. 4-115841).
[0005]
In the apparatus described in Japanese Utility Model 63 -7422 discloses the hydraulic cylinder output is arranged on the side of the horizontal pivot axis is adapted to be transmitted to the horizontal pivot axis via a crank. Further, in the apparatus described in Japanese Patent Laid-Open No. 4-115841, the hydraulic cylinder is arranged on the side of the horizontal turning shaft, and the output is transmitted to the horizontal turning shaft by a combination of a rack and a pinion or a chain and a pulley. It is like that.
[0006]
[Problems to be solved by the invention]
However, in the devices described in the above two publications, transmission means such as a crank, a rack and a pinion, a chain and a pulley are required to transmit the output of the hydraulic cylinder to the horizontal turning shaft, so the number of parts increases. There is a problem that the cost becomes high. In addition, a space for installing the direct acting hydraulic cylinder and the transmission means is required, and there is a problem that the entire tilting table device is enlarged.
[0007]
An object of the present invention is to provide an inclined table device that solves the above-described problems, reduces the number of parts, reduces the cost, and can reduce the overall size.
[0008]
[Means for Solving the Problems and Effects of the Invention]
The tilt table device according to the present invention includes a support table, and a tilt table that is provided on the support table so as to be tiltable and supports a rotary table that holds a workpiece, and the tilt table is rotated about a horizontal axis by a horizontal pivot. a in which the tilting table device adapted to be tilted to, is the rising portion is provided in the support base, the rising portion, are formed through holes horizontal pivot shaft is passed, the through hole, the horizontal pivot axis A vane-type hydraulic rotary actuator that applies torque to the horizontal swivel axis is provided around it, and this vane-type hydraulic rotary actuator adjusts the balance of the force acting on the horizontal swivel axis when the tilt table is tilted. It is.
[0009]
According to the tilt table device of the present invention, since the vane type hydraulic rotary actuator for applying torque to the horizontal swivel shaft is provided around the horizontal swivel axis, the rotation direction of the horizontal swivel shaft when the tilt table is tilted. When a torque imbalance occurs due to a reverse torque, a vane type hydraulic rotary actuator can apply a torque in a direction opposite to the above torque caused by the tilt of the tilt table. Therefore, it is possible to adjust the balance of the force acting on the horizontal turning axis, and to perform the positioning of the tilting table with high accuracy. Further, it is possible to prevent a large load from being applied to the driving source of the tilting table and the transmission device that transmits the driving force of the driving source to the tilting table, thereby preventing them from being damaged in a short period of time. Further, it is not necessary to increase the capacity of the drive source, and a small drive source can be used.
[0010]
A vane-type hydraulic rotary actuator that applies torque to the horizontal turning shaft is provided around the horizontal turning shaft in the through hole through which the horizontal turning shaft passes at the rising portion of the support base. Torque can be applied directly, and no transmission means is required unlike conventional devices. Therefore, the number of parts is reduced, the cost is reduced, and the entire size can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
1 and 2 show the overall configuration of the tilting table device according to the present invention, FIGS. 3 and 4 show the main parts thereof, and FIGS. 5 and 6 show the operating state of the tilting table device. In the following description, the left and right sides in FIGS. 1 and 2 are referred to as the left and right sides, the front side in FIG. 1 and FIG. 2 is the front side, and the opposite side is the back side.
[0013]
As shown in FIGS. 1 and 2, the tilt table device includes a support base 1, and a tilt table 2 supported on the support base 1 so as to be tiltable around a horizontal axis extending in the left-right direction. The tilting table (2) is tilted by two horizontal pivots (3).
[0014]
The left and right ends of the support base (1) are provided with rising portions (4), respectively. A through hole (5) extending in the left-right direction is formed at the upper end of the rising portion (4).
[0015]
The tilt table (2) is provided with a rotary table (6) for holding the workpiece (W). The rotary table (6) is driven via a transmission means (not shown) by a drive source (not shown) such as a servo motor. Brackets (7) projecting upward when the rotary table (6) is in a horizontal state are provided at both left and right ends of the tilt table (2). Each bracket (7) is formed with a through hole (8) extending in the left-right direction. A cylindrical portion (9) that protrudes outward in the left-right direction and is located in the through hole (5) of the support base (1) is integrally formed on the outer surface in the left-right direction of each bracket (7). The left and right inner ends of the horizontal pivot shaft (3) are inserted and fixed in the through holes (8) and the cylindrical portion (9) of each bracket (7). The cylindrical portion (9) and the horizontal swivel shaft (3) are rotatably supported by the rising portion (4) of the support base (1) via bearings (10) and (11), respectively. The left and right horizontal turning shafts (3) are driven to rotate by a servo motor (12) via a worm gear device (13).
[0016]
A vane-type hydraulic rotary actuator (14) that applies torque to the horizontal swivel shaft (3) is placed in the through hole (5) of the support base (1) around the horizontal outer end of each horizontal swivel shaft (3). It is provided so that it may be located in. As shown in FIGS. 3 and 4, each rotary actuator (14) is fixed to the horizontal turning shaft (3) and is rotated with the horizontal turning shaft (3). And a short cylindrical outer tube (16) secured in the through hole (5) of the rising portion (4) so as to be concentric with the inner tube (15) and the outer tube (16). And an annular closing plate (17) that closes both left and right openings of the space between the tubes (15) and (16), and is fixed to the outer tube (16) on one diameter and between the tubes (15) and (16). Two partition walls (19) that divide the space into two oil chambers (18), and two movable vanes (one diameter on the inner tube (15) and located in each oil chamber (18)) And 20). A packing (23) is arranged between the inner tube (15) and each closing plate (17), and an O-ring (24) is arranged between the outer tube (16) and each closing plate (17). ing.
[0017]
Supply and discharge oil ports (21A) and (21B) are respectively formed in portions of the outer tube (16) corresponding to both end portions in the circumferential direction of the respective oil chambers (18). Further, a bearing (22) is interposed between each closing plate (17) and the horizontal pivot shaft (3), and the outer tube (16) and the closing plate (17), the horizontal pivot shaft (3) and the inner tube are arranged. (15) is relatively rotated.
[0018]
In each oil chamber (18) of the vane type hydraulic rotary actuator (14), when the tilt table (2) is tilted, the rotation angle of the tilt table (2) detected by a rotation detector (not shown) is set. The oil with the appropriate pressure is supplied, and the torque in any one direction is applied to the horizontal turning shaft (3) through the movable vane (20) and the inner tube (15).
[0019]
In the tilt table device having the above configuration, the horizontal pivot axis (3) is rotated by a predetermined angle through the worm gear device (13) by the servo motor (12), whereby the tilt table (2) extends in the left-right direction. Tilted around.
[0020]
When the tilting table (2) is tilted counterclockwise as shown in FIG. 5 (a), the horizontal turning shaft (3) has a clockwise torque as indicated by an arrow A in FIG. 5 (a). Acts and unbalances the force. Then, according to the rotation angle of the tilting table (2), as shown in FIG. 5 (b), from the oil supply / discharge port (21B) in the clockwise direction with respect to the movable vane (20) in each oil chamber (18). Oil of a predetermined pressure is supplied into each oil chamber (18), and as a result, it is indicated by the arrow B in FIG. 5 (b) to the horizontal swivel shaft (3) via the movable vane (20) and the inner tube (15). Such counterclockwise torque is applied.
[0021]
When the tilting table (2) is tilted clockwise as shown in FIG. 6 (a), the horizontal swivel shaft (3) is counterclockwise as shown by the arrow X in FIG. 6 (a). Torque acts to generate a force imbalance. Then, according to the rotation angle of the tilting table (2), as shown in FIG. 6 (b), the oil supply / discharge port (21A) on the counterclockwise direction side relative to the movable vane (20) in each oil chamber (18). To each oil chamber (18) is supplied with oil of a predetermined pressure. As a result, the horizontal swivel shaft (3) is passed through the movable vane (20) and the inner tube (15), and the arrow Y in FIG. A clockwise torque as shown is applied.
[0022]
Therefore, in any case, the balance of the force acting on the horizontal turning shaft (3) can be adjusted, and the tilt table (2) can be positioned with high accuracy. In addition, a large load is prevented from being applied to the servo motor (12) that is the drive source of the tilt table (2) and the worm gear device (13) that transmits the drive force of the servo motor (12) to the tilt table (2). This makes it possible to prevent these short-term damages. Further, it is not necessary to increase the capacity of the servo motor (12), and a small servo motor (12) can be used.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a tilting table device according to the present invention.
FIG. 2 is a partially cut away front view.
3 is an enlarged sectional view taken along line III-III in FIG.
4 is an enlarged cross-sectional view showing a part of FIG. 2. FIG.
FIG. 5 is a diagram showing an operation state of the apparatus when the tilt table is tilted in one direction.
FIG. 6 is a diagram showing an operation state of the apparatus when the tilt table is tilted in another direction.
[Explanation of symbols]
(1) : Support stand
(2): Inclined table
(3): Horizontal swivel axis
(4) : Rising part
(5) : Through hole
(14): Vane type hydraulic rotary actuator
(W): Workpiece

Claims (1)

A support base, mounted for tilting the support table, and has a tilting table which supports the rotating table holding the workpiece, the tilting table is adapted to be tilted about a horizontal axis by the horizontal pivot axis a tilting table device are, is the rising portion is provided in the support base, the rising portion, are formed through holes horizontal pivot shaft is passed, the through hole, about a horizontal pivot axis, a torque to the horizontal pivot axis The tilt table device is provided with a vane-type hydraulic rotary actuator that imparts a balance, and the vane-type hydraulic rotary actuator adjusts the balance of the force acting on the horizontal swing axis when the tilt table is tilted.

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