JPS5946734B2 - Rotary table attitude change device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for changing the attitude of a rotary table, and an object of the present invention is to provide an apparatus that accurately and stably changes the attitude of a rotary table from a horizontal state to an inclined state.

Conventionally, a rotary table in a numerically controlled machine tool or the like is generally indexed and rotated with the table surface within a horizontal plane, and therefore a workpiece placed on the rotary table can only be machined on a horizontal plane and a vertical plane.

Therefore, in order to improve productivity, there has been a demand for a rotary table that can be tilted by changing its posture and that allows multifaceted machining of a workpiece.

In order to satisfy this requirement, the east rotary table is indexed and rotatably supported on a support base, and pivoted around the support base so that it can rotate and tilt around an axis perpendicular to the rotation axis of the rotary table. It is conceivable to change the attitude of the rotary table from a horizontal state to an inclined state by rotating the support base using a worm-worm wheel mechanism in which the support base is rotationally connected to a drive motor.

However, in this case, there is a bump in the worm/worm wheel mechanism that impedes rotational transmission.

Furthermore, for the support base and rotary table, the center of gravity of the support base and rotary table is on the table surface, and as the posture changes between the horizontal state and the tilted state, the vertical line passing through the rotation axis of the support base is defined as a boundary. ℃ displaced to the opposite side.

Furthermore, because of the influence of backlash due to the movement of the center of gravity, it is impossible to change the attitude of the rotary table with high precision, resulting in a decrease in the processing accuracy of the workpiece placed on the rotary table.

The present invention has been made to solve these problems, and when changing the attitude of the rotary table between a horizontal table surface state and an inclined state, the center of gravity of the support base and the rotary table is This is a device that applies an external force to the support base from the side in the tilting direction until the support base passes on a vertical line including the axis of motion, thereby eliminating the aforementioned bumpiness and achieving good rotational transmission.
In addition, it compensates for the movement of the center of gravity that causes unbalance, and allows the rotary table to change its posture accurately and reliably. It also supports the weight of the support base and the rotary table appropriately during the posture change, and tilts the support base and the rotary table. can be performed stably, smoothly, and favorably.

An embodiment of the apparatus of the present invention will be described below with reference to the drawings.

A rotary shaft 11 is fitted and fixed to the support base 1, and a rotary table 2 on which a workpiece W is placed is attached to the rotary shaft 11 so as to be rotatable with respect to the support base 1.

A worm wheel 21 is fixed to the lower surface of the rotary table 2, and a worm 13 of a worm shaft 12 rotatably supported on the support base 1 is meshed with the worm wheel 21.

The worm shaft 12 is connected for one rotation via a pulse motor 14 disposed on the side of the support base 1.

This rotation of the worm shaft 12 causes the rotary table 2 to rotate forward or reverse relative to the support base 1 and around the rotary shaft 11.

The base body 30 includes a support base 3 that rotatably supports the support shaft 15.
is installed.

The support shaft 15 has its axis line perpendicular to the rotary shaft 11 of the rotary table 20.

The support base 1 is pivotally supported by the support shaft 15 so as to be rotatable and tiltable about the shaft.

The tilt axis 0 of the support base 1, which is perpendicular to the rotation axis t of the rotary table 20, has a deviation amount d as shown in FIG.
This is offset to the side of the rotary table 2.

A worm wheel 16 is fixed to the support base 1 on the inner side of the support base 3, and a worm 32 of a worm shaft 31 rotatably supported by the support base 3 is meshed with the worm wheel 16.

The worm shaft 31 is rotatably connected to a pulse motor 34 disposed on the side of the support base 3 via a gear transmission mechanism 33 installed in the lower part of the support base 3 .

Due to this rotation of the worm shaft 31, the support base 1 is tilted up and down within a predetermined angle range with respect to the support stand 3 and around the support shaft 15.

As a result, the rotary table 2 on the support base 1 can tilt its table surface.

A pair of fluid pressure cylinder devices 4 and 5 as a holding device and a fluid pressure cylinder device 6 as an external force applying device are installed on the sides of the support base 3.

As shown in FIGS. 5 and 6, the pair of fluid pressure cylinder devices 4 and 5 appropriately support the tilting position of the support base 1, and have a piston (not shown) slidably fitted in the cylinder. The piston rod 41 has an actuation rod 44 slidably fitted in a support block 43 fixed to a support bracket 42, which will be described later.
integrally connected to.

A support bracket 42 and a bearing stand 35, which are fixed at a predetermined distance on the base body 30 and are fixed together, support a clamp shaft 36.

The crankshaft 36 has a long through hole 36c and is fitted into a lock 735a mounted on the bearing stand 35, so that it can slide only in the axial direction and is restricted from rotating.

This crankshaft 36 is provided with a left-hand thread 36a and a right-hand thread 36b, respectively.
One end of a rotation arm 45 is rotatably screwed into each of the two.

The other end of the rotating arm 45 is connected and pivoted to the operating rod 44 via a connecting pin 46.

A protrusion 11 that is integrally connected to the support base 1 is disposed between the bearing stand 35 and the support bracket 420.

This protrusion 11 has an arc-shaped long hole 18 into which the clamp shaft 36 is fitted.

Further, the clamp shaft 36 has a flange portion 36d disposed between the projection portion 17 and the bearing stand 35.

Regarding the holding operation of the support base 1 by the pair of fluid pressure cylinder devices 4 and 5, when unclamping the support base 1
As the supporting base 1 reaches a desired tilting position, the operating rod 44 is controlled backward, and the rotating arm 45 By rotating the support base 1 in the positive direction (to the position indicated by the solid line in FIG. 5 at °C), the support base 1 is cranked and held at the tilted position.

Unclamping is performed by controlling the actuating rod 44 backward and rotating the rotating arm 45 in the opposite direction (to the imaginary line position in FIG. 5).

More specifically, when the actuating rod 44 moves backward during clamping, the rotating arm 45 rotates in the forward direction.
The screwing relationship between the left-hand thread 35a and the right-hand thread 36b of No. 6 is tightened, and the clamp shaft 36 is slid in the axial direction (in the direction of the solid line arrow in the figure).

As a result, the space between the flange portion 35d of the clamp shaft 36 and the support bracket 420 is narrowed, and the projection portion 11 is sandwiched between them, thereby cranking the support base 1.

Further, the clamp is released by rotating the rotating arm 45 in the opposite direction by forward movement of the operating rod 44, and the clamp shaft 36 is rotated in the opposite direction.
The crankshaft 36 is slid in the axial direction (in the direction of the dashed arrow in the figure) by loosening the screwing relationship between the left-hand thread 36a and the right-hand thread 36b.

As a result, the space between the flange portion 36d of the clamp shaft 36 and the support bracket 420 is widened, the projection portion 17 is released, and the support base 1 is unclamped.

On the other hand, the fluid pressure cylinder device 6 applies an appropriate external force in the tilting direction of the support base 1 according to the tilting position of the support base 1, as shown in FIG. It has a piston rod 61 (not shown).

A pusher 62 having a spherical surface is integrally connected to the piston rod 61 at its tip.

The suppressor 62 has its tip abutted against the engagement groove 22a of the engagement member 22 fixed to the side of the support base 1 within a predetermined tilting range of the support base 1, so that the suppressor 62 can be suppressed.

The end portion 63 of the fluid pressure cylinder device 6 is pivotally supported by a U-shaped support block 64 fixed on the base 30 so as to be swingable within the tilting plane of the support base 1.

A regulating member 65 for adjusting the swing range of the fluid pressure cylinder device 6 is disposed facing the support block 64 so that it can still come into contact with the outer periphery of the fluid pressure cylinder device 6.

Pressure control of the suppressor 62 against the support base 1 is performed when the rotary table 2 is in the tilted state P in FIG. 4 from the table surface horizontal state.
1 and vice versa, the suppressor 62
This is done so that an external force due to fluid pressure is applied to the support base 1 in the direction of its tilting.

In the device of the present invention having the above configuration, the rotary table 2 includes a pulse motor 14, a worm shaft 12, and a worm 1.
3. A predetermined rotational power for indexing is transmitted via the worm wheel 21, and the worm wheel is rotated relative to the support base 1 in the forward or reverse direction about the rotating shaft 11, and rotated and indexed to a predetermined position.

The support base 1 also has a pulse motor 34 and a gear transmission g33.
, worm shaft 31, worm 32, worm wheel 1
6, a predetermined tilting force for rotation in the forward or reverse direction is transmitted, and the support base 3 is tilted in the upward or downward direction about the support shaft 15, and is tilted and indexed to a predetermined position.

The rotary table attitude changing device can operate the rotational indexing of the rotary table 2 and the tilting indexing of the support base 1, respectively, independently or in combination.

In addition, when the support base 1 is indexed to a desired tilting position, this rotary table attitude changing device controls the movement rod 44 to move forward and backward using the pair of fluid pressure cylinder devices 4 and 5, so that the rotary arm 45 can be rotated. By rotating and locking on the shaft 36, the support base 1 can be accurately clamped at the predetermined tilted position with respect to the base body 30.

As a result, when performing heavy cutting on the workpiece W, the support base 1 can perform stable machining without any movement.

By the way, when the rotary table attitude changing device tilts the rotary table 2 or changes its attitude as described above,
The tilting and rotation axes of the support base 1 and the rotary table 2 are arranged with a predetermined deviation amount, and the centers of gravity of the support base 1 and the rotary table 2 are adjusted according to the change in the posture of the table surface and the rotation of the support base 1. The vertical line passing through the axis is displaced to the opposite side as a boundary, and the center of gravity shifts, causing imbalance in the support base 1 and rotary table 2. Therefore, it is possible to perform a more accurate posture change due to the influence of backlash in the worm/worm wheel mechanism. do not have.

However, in this device, the fluid pressure cylinder device 6 causes the presser 62 to come into contact with the engagement groove 22a of the engagement member 22 of the support base 1, and the center of gravity of the support base 1 and the rotary table 26 is rotated by the support base 10. An external force by fluid pressure is applied to the support base 1 in the tilting direction until the rotary table 2 passes on a vertical line including the axis, that is, until the rotary table 2 reaches the tilted state P0 in FIG.

As a result, the above-mentioned worm/worm wheel mechanism 16
, 31 and 32, gear transmission is always carried out in one direction in a tilted state, and backlash is efficiently maintained regardless of the movement of the center of gravity (
It is possible to accurately and reliably change the attitude of the rotary table 2, and at the time of this attitude change,
The weight of the support base 1 and the rotary table 20 can be properly supported, and the posture of the rotary table 2 can be changed stably.

Further, the suppressor 62 of the fluid pressure cylinder device 6 moves the center of gravity of the support base 1 and rotary table 2 over the vertical line as the support base 1 and rotary table 2 progress, that is, after passing through the tilting state P□. It can be disengaged from the engagement groove 22 and the external force applied to the °C support base 1 can be released.

As described in detail above, in the rotary table attitude changing device of the present invention, when the rotary table is changed from a horizontal state to an inclined state, the center of gravity of the support base and the rotary table is aligned with the rotation axis of the support base. An external force is applied to the support base in the lateral direction of the tilting direction until the support base passes on a vertical line containing Since the rotary table can be removed at all times, good rotation transmission can be obtained, and the weight of the support base and rotary table can be properly supported during attitude change, accurate, stable, and smooth attitude change of the rotary table can be performed.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the device of the present invention, Fig. 2 is a view taken from the arrow ■ in Fig. 1, and Fig. 3 is a view taken from m-- in Fig. 1.
Fig. 4 is an enlarged cross-sectional view along the line IV--IV in Fig. 2, Fig. 5 is an enlarged cross-sectional view taken along the line ■-■ in Fig. 2, and Fig. 6 is an enlarged cross-sectional view along the line It is a sectional view taken along the line ■-■ in the figure. In the figure: 1...Support base, 2...Rotary table, 3...Support body, 4, 5...
Holding device, 6... External force applying device, 16...
... Worm wheel, 31 ... Worm shaft,
62...Press element, 22...Engagement member,
22a...Engagement groove.

Claims (1)

[Claims] 1 A base body having a rotary table rotatably supported by a support base, and pivotably supporting the support base so as to be tiltable by rotating the support base around an axis perpendicular to the rotation axis of the rotary table using a worm/worm wheel mechanism. and is equipped with an external force applying device that applies an external force to the support base in degrees Celsius, and this external force applying device causes the center of gravity of the support base and the rotary table to align with the rotation axis of the support base as the support base and the rotary table tilt. An external force is applied to the support base from the side in the tilting direction until the center of gravity passes over the vertical line, and after the center of gravity passes over the vertical line, the external force applied to the support base is released. A rotary table attitude changing device featuring: