JPH1034465A - Turntable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sure positioning and fastening in a turntable device and simplify the device. SOLUTION: This turntable device is constituted of rotary plate parts 41, 42 coupled with an end of a rotary shaft part 43 inserted in a hollow hole 12 having a stage part providing a fastening surface 16a, freely rotatable and displaceable to a axial line direction, and removably engageable with the fastening surface of a base bed 1, a hydraulic cylinder having an annular piston provided on the peripheral surface for the hollow hole 12 in the base bed 1, a bearing 8 interposed between the annular piston and rotary plate parts 41, 42 to support rotatably the rotary plate parts 41, 42 and a rotary drive source 6 coupled with the other end of the rotary shaft part 43 through a reduction gear 5 in the coaxial relation with the rotary shaft part. And a tapered annular part 44 of the rear surface of a rotary table 4 and a tapered recess part 17 of the fastening surface of the base bed 1 can engage each other. The rotary plate parts 41, 42 are pressed against the fastening surface by the operation of the hydraulic cylinder in one direction and separated from the fastening surface through the bearing 8 by the operation in the other direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary table device used in a machine tool or the like.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional rotary table apparatus includes a base 50 and a rotary table 60. The base 50 is concentrically provided with an upper cylindrical portion 51 and an intermediate large-diameter cylindrical member. Portion 52 and a lower cylindrical portion 53, and an inner flange 54a
A cylindrical sliding guide portion 54 having a top portion is provided so as to protrude, and a top surface of the inner flange 54a is formed with a pocket 54c through which lubricating oil is pumped from the outside of the base 50 through a through hole 54b.
Is formed, and serves as a sliding surface for the inner flange 61b (described later) of the top plate portion 61.

A turntable 60, which is mounted on the base 50 so as to be rotated and fastened, has a top plate 61, which is placed on the top surface of an inner flange 54a of a sliding guide 54 in order from the upper side. Upper cylindrical part 51 and middle large-diameter cylindrical part 5 of base 50
2 is rotatably supported by ball bearings 70, 70, and in a large-diameter shaft portion 62 to which a worm wheel 71 of a worm rotation drive mechanism is mounted in an intermediate large-diameter cylindrical portion 52 and a lower cylindrical portion 53 of a base 50. The small-diameter shaft portion 63 rotatably fitted is connected in a vertical coaxial relationship.

A pressure oil distributor 55 provided in the lower cylindrical portion 53, that is, in the area of the small-diameter shaft portion 63 below the worm rotation drive mechanism, is vertically formed on the inner peripheral surface of the lower cylindrical portion 53. A plurality (four in the illustrated example) of annular oil grooves 5
5a and an oil passage 55b formed in the base 50 communicating with each annular oil groove 55a from outside.

[0005] A cylindrical projection 61a is formed on the outer periphery of the top plate portion 61 downward, and the lower end thereof is rotatably fitted on the outer peripheral surface of the sliding guide portion 54 of the base 50, and has an inner surface. A flange 61b is formed. Inner flange 61b
Are overlaid on the inner flange 54a of the sliding guide 54.

An annular piston member 80 having upper and lower outer flange-shaped upper piston portions 81 and lower piston portions 82 formed at upper and lower ends is slidably fitted into the upper cylindrical portion 51. The outer peripheral surface of the piston portion 81 is On the inner peripheral surface of the cylindrical projection 61a of the top plate 61, the outer peripheral surface of the intermediate portion is an inner flange 61.
b and the inner peripheral surface of the inner flange 54a.
The outer peripheral surfaces 2 are fitted to the inner peripheral surface of the sliding guide portion 54, respectively.

The first oil chamber 91 between the upper surface of the lower piston portion 82 and the lower surface of the inner flange 54a, and the second oil chamber 92 between the lower surface of the lower piston portion 82 and the upper surface of the intermediate large-diameter cylindrical portion 52. The supply and discharge of pressure oil are alternately performed by a hydraulic circuit (not shown) to
0 moves up and down. Intermediate large-diameter cylindrical part 52
Inside, the worm 72 meshing with the worm wheel 71 is controlled and driven by an external driving means (not shown).

At the time of indexing rotation of the rotary table 60, pressure oil is supplied to the second oil chamber 92, the annular piston member 80 is at the raised position, and the upper piston portion 81 moves the inner flange 61 b of the top plate 61. release. Lubricating oil is supplied from the through hole 54b to the pocket 54c to the top surface of the inner flange 54a, that is, the sliding surface, that is, the sliding surface by an oil supply means (not shown). (See the left side of FIG. 3) The worm 72 is rotated by a predetermined amount by an external driving means (not shown), whereby the worm wheel 7 is rotated.
1, that is, the sliding surface to which the lubricating oil is supplied and the turntable 60 supported by the ball bearing 70 are indexed and rotated to a predetermined position.

When the indexing rotation of the rotary table 60 is completed and the pocket 54c is released through the through hole 54b, the top plate 61, that is, the rotary table 60 is lowered, and the inner flange 61 is lowered.
b contacts the top surface of the inner flange 54a, that is, the sliding surface.
Then, oil is discharged from the second oil chamber 92 and pressurized oil is supplied to the first oil chamber 91, the annular piston member 80 is at the lowered position, and the upper piston 81 is moved to the inner flange 61b of the top plate 61. Is pressed toward the top surface of the inner flange 54a, that is, the sliding surface.
Are fastened to the base 50. (See Fig. 3 right)

[0010]

In the above rotary table apparatus of the prior art, lubricating oil is supplied to the top surface of the inner flange 54a of the base 50, which is a sliding surface, during indexing rotation. Then, after the indexing rotation of the turntable 60,
That is, even when the rotary table 60 is lowered and the inner flange 61b of the top plate 61 contacts the top surface of the inner flange 54a, that is, the sliding surface, the lubricating oil remains, and the top plate 61
When the inner flange 61b is pressed toward the top surface of the inner flange 54a of the base 50, that is, the sliding surface, the lubricating oil is not completely discharged, and an oil film exists.

As a result, the fixing of the indexing position of the rotary table 60 is incomplete, and when a load is applied to the rotary table 60, slippage occurs and the indexing position is easily shifted.
Even if the oil film is removed, it takes a long time. or,
The worm mechanism itself is expensive, and the number of components is large, so that the work of assembling the worm mechanism into the rotary table device is complicated, and the cost of the rotary table device is high. Further, the worm mechanism has a limit in indexing accuracy, which affects the accuracy of the rotary table device. SUMMARY OF THE INVENTION The present invention solves the above-described problems of the conventional rotary table device.

[0012]

According to the present invention, there is provided a rotary table apparatus comprising: (a) a base provided with a hollow hole having a step portion serving as a tightening surface; A rotating table part provided at one end and having a rotating shaft part inserted into the hollow hole of the base, and a rotatable and axially displaceable rotary table; (c) provided on the peripheral surface of the hollow hole of the base. (D) a bearing interposed between the annular piston and the rotary table to rotatably support the rotary table, and (e) a coaxial shaft via the reducer to the other end of the rotary shaft. It is composed of a rotary drive source which is connected in a line relation and allows the axial displacement of the rotary shaft portion; An inner peripheral tape that can be engaged with and disengaged from the outer peripheral tapered surface of the annular body. A surface is formed, or an annular tapered surface of the outer peripheral taper surface is formed on the tightening surface of the base, and an inner taper surface that is capable of engaging and disengaging with the outer tapered surface of the annular member on the back surface of the rotary table. The rotary plate is separated from the tightening surface via the bearing by the operation of the hydraulic cylinder in one direction, and the rotary table is indexed to an arbitrary position by the rotary drive source in that state, and the rotary table is operated by the operation in the other direction of the hydraulic cylinder. The rotating plate portion is pressed against the tightening surface.

In the indexing rotation of the rotating plate portion, when the hydraulic cylinder is operated and the annular piston is raised, the rotating plate portion is released from being pressed against the clamping surface of the base, and
Further, the ascending annular piston pushes up the rotating plate portion via the bearing, and the back surface thereof separates from the fastening surface of the base, and the outer peripheral tapered surface of the annular body portion between the back surface of the rotating table and the fastening surface of the base. Is separated from the inner peripheral taper surface, and the rotating plate portion becomes rotatable via a bearing supported by an annular piston.

At this time, the rotary shaft is also displaced upward, but since the displacement is permitted by the rotary drive source, there is no problem in transmission. Then, when the rotation drive source is controlled and driven by a predetermined amount, the rotation shaft portion rotates by a predetermined amount. That is, the rotating plate portion is indexed and rotated to a predetermined position via a bearing supported by the annular piston. When the rotary drive source is stopped and the indexing rotation of the rotating plate portion is completed and the hydraulic cylinder is operated, the annular piston descends while supporting the rotating plate portion via the bearing. Then, the rotating plate part descends via the bearing. At this time, the rotating shaft portion is also displaced downward, but similarly to the case of upward displacement, this displacement is allowed by the rotary drive source, so that there is no problem in downward displacement.

Then, the lower surface of the rotating plate portion is
While contacting the tightening surface of the base, the outer peripheral taper surface of the annular body formed on the back surface of the rotary table contacts the inner taper peripheral surface formed on the tightening surface of the base, or on the back surface of the rotary table. The formed inner peripheral taper peripheral surface contacts the outer peripheral taper surface of the annular body portion formed on the tightening surface of the base, and the lowering of the rotating plate portion is prevented, but the annular piston further descends,
It separates from the bearing and presses the lower surface of the rotary plate against the tightening surface of the base, and elastically deforms the annular body to press against the inner peripheral tapered surface. The rotating plate portion is accurately centered by the close contact between the outer peripheral taper surface and the inner peripheral taper surface of the annular body portion due to elastic deformation of the annular body portion, and is pressed against the tightening surface of the base on the lower surface of the rotating plate portion. It is fastened to the indexing position by contact.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary table device used in a machine tool according to an embodiment of the present invention will be described with reference to the drawings. The vertical and horizontal directions are the directions in FIG. The base 1 of the turntable has an outer flange 11 at the upper end.
Are formed in order from the upper end surface to form a large-diameter circular concave portion, a central hole 12 and a circular concave portion 13 having an enlarged diameter from the central hole 12 formed in a coaxial relationship and penetrated.

The base 1 of the turntable 4 is fitted in a mounting hole formed in the bed B, inserted into a bolt hole formed in the outer flange 11 at a regular interval, and screwed into the bed B. It is fixed to the bed B by bolts 7. The large-diameter circular recess has an upper opening recess 14 and a step portion 15.
And a lower concave portion 16 and a tapered concave portion 17 having a tapered peripheral surface 17a which is formed on a bottom surface of the lower concave portion 16, that is, a tightening surface 16a.

On the upper surface of the base 1, a guide ring 2 concentrically located with the base 1 is inserted into a bolt hole formed in a circumferentially equidistant manner, and screwed into an outer flange 11 of the base 1. It is fixed by bolts 7. The inner peripheral surface of the guide ring 2 includes a lower inner peripheral surface 21, a downward stepped portion 22, and an intermediate inner peripheral surface 2.
3. It is formed from a downward step 24 and an upper inner peripheral surface 25. The lower inner peripheral surface 21 has the same circumferential surface as the upper opening concave portion 14 of the large diameter circular concave portion, and the intermediate inner peripheral surface 23 has the same circumferential surface as the lower concave portion 16 of the large diameter circular concave portion.

A rotary table 4 is mounted on the base 1 so as to rotate and move up and down.
The top plate portion 41 is mounted on the upper surface of the guide ring 2 sequentially from the upper side with a small gap therebetween, and has a fitting ring portion 41a formed at the peripheral edge thereof for preventing intrusion of cutting and grinding fluid and the like from the outside. It is bolted to the lower surface of the plate portion 41, and the tightening surface 16a of the base 1 is
The rotating plate portion 42 and the rotating plate portion 42 are integrally formed with the rotating shaft portion 43 inserted into the center hole 12, and the lower surface of the rotating plate portion 42 is pressed against the tightening surface 16 a of the base 1. As a result, the turntable 4 is fastened. Rotating plate part 42
The top plate 41 may be integrated and include the top plate 41.

The outer peripheral surface of the rotating plate portion 42 has two step portions 42
a and 42b are formed, and the inner ring 8a of the cross roller bearing 8 fitted to the upper outer peripheral surface of the rotating plate portion 42 is attached to the top plate portion 41.
The outer peripheral surface of the outer ring 8b of the cross roller bearing 8 is on the same cylindrical surface as the lower outer peripheral surface of the rotating plate portion 42. Upper opening concave portion 14, step portion 15, lower concave portion 16 of base 1 and lower inner peripheral surface 2 of guide ring 2
1, a cylinder formed by a downward stepped portion 22 and an intermediate inner peripheral surface 23 has a piston portion 32 at the center of the outer peripheral surface of the annular body 31 and an annular pressing portion 33 at the central portion of the inner peripheral surface.
The annular piston members 3 formed to protrude from each other are fitted slidably up and down.

That is, the upper part of the annular body 31 is in an annular space formed by the intermediate inner peripheral surface 23 of the guide annular body 2 and the outer peripheral surface of the outer ring of the cross roller bearing 8, and the lower part of the annular body 31 is a large-diameter circular recess. Are respectively slidably fitted up and down in annular spaces formed by the inner peripheral surface of the lower concave portion 16 and the lower outer peripheral surface of the rotary plate portion 42. Is engaged so as to be able to move up and down in the gap between the step part 42b.

The piston portion 32 has a cylinder surface formed of the lower inner peripheral surface 21 of the guide ring 2 and the upper opening recess 14 of the base 1 so as to slide up and down between the step portion 22 and the step portion 15. The first oil chamber 34 between the lower surface of the piston portion 32 and the step portion 15 and the second oil chamber 35 between the upper surface of the piston portion 32 and the step portion 22 alternately slidably. The supply and discharge of the pressurized oil is performed by a hydraulic circuit (not shown), so that the annular piston member 3 moves up and down.

On the lower surface of the rotary plate portion 42, a thin-walled tapered annular portion 44 having a centering tapered surface 44a which can be detachably fitted to the tapered peripheral surface 17a of the tapered recess 17 of the base 1 is provided. Is formed. In the illustrated embodiment, the tapered concave portion 17 of the base 1 and the tapered annular portion 44 of the rotating plate portion 42 are used.
May be reversed. That is, the tapered annular portion 44 may be formed on the fastening surface 16 a of the base 1, and the tapered recess 17 may be formed on the lower surface of the rotating plate portion 42.

The lower end of the rotating shaft 43 is connected to the motor 6 via the speed reducer 5 fitted in the circular recess 13 of the base 1. The motor 6 is controlled and driven by an external control device (not shown). It has become. That is, a flex spline 5a is attached to the lower end of the rotating shaft portion 43, and a wave generator 5b is attached to the motor shaft of the motor 6 mounted on the lower surface of the base 1 in a coaxial relationship. A wave generator 5b is engaged with a circular spline 5c meshing with 5a.

The pressure oil distributors 18 provided in the area of the rotary shaft 43 between the rotary plate 42 and the speed reducer 5 are vertically arranged on the inner peripheral surface of the center hole 12 and are plural (in the example shown in the figure). (Four) annular oil grooves 18a and oil passages 18b formed in the base 1 communicating with the respective annular oil grooves 18a from outside. In the above embodiment, the rotary table is a rotary table device in which the rotation axis of the rotary table is in the upright direction. However, a rotary table device or an indexing device in which the rotary axis of the rotary table is horizontal and in other directions may be used.

The operation and operation of the rotary table device will be described. At the time of indexing rotation of the rotary table 4, pressure oil is supplied to the first oil chamber 34 by a pressure oil circuit (not shown) and discharged from the second oil chamber 35. Then
The annular piston member 3 is raised, the annular pressing portion 33 is separated from the step portion 42b of the rotating plate portion 42, and the lower surface of the rotating plate portion 42 is
The annular pressing portion 33, which is released from the pressing on the tightening surface 16a of the base 1 and further rises, contacts the outer ring 8b of the cross roller bearing 8 to push up the outer ring 8b.

Then, the top plate portion 41 and the rotating plate portion 42 rise through the cross roller bearing 8, and the lower surface of the rotating plate portion 42 is separated from the tightening surface 16 a of the base 1, and
4 is also the tapered peripheral surface 17 of the tapered recess 17.
a, the top plate portion 41 and the rotary plate portion 42, that is, the rotary table 4, become rotatable via the cross roller bearing 8 supported by the annular piston member 3. At this time, the rotating shaft 4
3, that is, the flex spline 5a of the speed reducer 5 is also displaced upward, but since the flex spline 5a is spline-coupled to the fixed-side circular spline 5c, there is no problem in transmission. (See Fig. 1 left)

When the motor 6 is controlled and driven by a predetermined amount by an external control device (not shown), the rotating shaft 43 is reduced by the speed reducer 5 to rotate by a predetermined amount. That is, the top plate portion 41 and the rotary plate portion 42 are supported by the cross roller bearing 8 and index to a predetermined position and rotate. When the motor 6 is stopped and the indexing rotation of the rotary table 40 is completed, the pressure oil is supplied to the second oil chamber 35 by a pressure oil circuit (not shown), and is discharged from the first oil chamber 34. Then, the annular piston member 3
Is lowered while supporting the top plate portion 41 and the rotating plate portion 42 via the cross roller bearing 8.

Then, the top plate portion 41 and the rotating plate portion 42 are lowered via the cross roller bearing 8. At this time, the rotating shaft 43, that is, the flex spline 5a of the speed reducer 5 is also displaced downward, but there is no problem in the downward displacement of the flex spline 5a as in the case of upward displacement.

As a result, the lower surface of the rotary plate 42 comes into contact with the tightening surface 16a of the base 1 and the tapered surface 44a of the tapered annular portion 44 also comes into contact with the tapered peripheral surface 17a of the tapered recess 17 by lowering. The lowering of the plate portion 41 and the rotating plate portion 42 is prevented, but the annular piston member 3 further descends, and the annular pressing portion 33 separates from the outer ring 8b of the cross roller bearing 8 and moves to the step portion 42b of the rotating plate portion 42. Abuts on the rotating plate portion 42
Is pressed against the tightening surface 16 a of the base 1, and the tapered annular portion 44 is elastically deformed to press the tapered surface 44 a against the tapered peripheral surface 17 a of the tapered recess 17. (See Fig. 1 right)

The top plate portion 41 and the rotary plate portion 42 are formed on the tapered surface 4 of the tapered annular portion 44 by elastic deformation of the tapered annular portion 44.
4a and the tapered peripheral surface 17a of the tapered recess 17 are accurately centered, and are fixed to the indexing position by pressing contact of the lower surface of the rotary plate portion 42 with the tightening surface 16a of the base 1.

[0032]

According to the rotary table apparatus of the present invention, the rotary table is separated from the tightening surface via the bearing by the operation of the hydraulic cylinder, and the rotary table is indexed while being supported by the bearing. The surface is not used as a sliding surface, and only mist air for rust prevention is supplied, so that there is no oil film at the time of fastening. Therefore, when a load is applied to the rotary table, slippage occurs, and the indexing position of the rotary table is not incompletely fixed such that the indexing position is easily shifted.

After the indexing of the rotary table is completed, when the rotary table is brought into pressure contact with the rotary table, the rotary taper is formed on the outer peripheral taper surface of the annular body formed on the back surface of the rotary table and the tightening surface of the base. Depending on whether the inner peripheral taper surface engages, or whether the inner peripheral taper surface formed on the back surface of the rotary table and the outer peripheral taper surface of the annular body portion formed on the tightening surface of the base engage. The centering of the table can be performed reliably. Since the rotary table is connected to the rotary drive source via a reduction gear in a coaxial relationship, the number of parts is reduced, the assembly work is simplified, and the cost of the rotary table device is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a rotary table used in a machine tool according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a cross-sectional front view of a rotary table used in a machine tool according to a conventional technique.

[Explanation of symbols]

Reference Signs List 1 base 11 outer flange 12 center hole 13 circular recess 14 upper opening recess 15 step 16 lower recess 16a fastening surface 17 taper recess 17a taper peripheral surface 18 pressure oil distributor 18a annular oil groove 18b oil passage 2 guide ring 21 lower Side inner peripheral surface 22, 24 Downward step 23 Intermediate inner peripheral surface 25 Upper inner peripheral surface 3 Annular piston member 31 Annular body 32 Piston portion 33 Annular pressing portion 34 First oil chamber 35 Second oil chamber 4 Rotary table 41 Top Plate part 41a Fitting ring part 42 Rotating plate part 42a, 42b Step part 43 Rotation shaft part 44 Tapered annular part (annular body part) 44a Tapered surface 5 Reducer 5a Flex spline 5b Wave generator 5c Circular spline 6 Motor 7 Mounting bolt 8 Cross roller bearing 8a Inner ring 8b Outer ring B Bed

Claims (3)

[Claims] A base provided with a hollow hole having a step serving as a tightening surface, a rotating plate portion which is detachably engageable with the tightening surface of the base is provided at one end, and is fitted into the hollow hole of the base. A rotary table having a rotating shaft portion, which is rotatable and axially displaceable, a hydraulic cylinder having an annular piston provided on a peripheral surface of a hollow hole of a base, and a rotary cylinder interposed between the annular piston and the rotary table to rotate It consists of a bearing that rotatably supports the table, and a rotary drive source that is coupled to the other end of the rotary shaft and that allows axial displacement of the rotary shaft. The plate portion is separated from the tightening surface, the rotary table is indexed to an arbitrary position by a rotary drive source in that state, and the rotary plate portion is pressed against the tightening surface by operating the hydraulic cylinder in another direction. Table equipment. 2. An annular body having an outer peripheral tapered surface is formed on the back surface of the rotary table, and an inner tapered surface is formed on a clamping surface of the base so as to be able to engage with and disengage from the outer tapered surface of the annular body. Or an annular tapered surface of an outer tapered surface is formed on a tightening surface of the base, and an inner tapered surface is formed on the back surface of the rotary table such that the inner tapered surface is engageable with and disengageable from the outer tapered surface of the annular member. Item 2. The rotary table device according to item 1. 3. The rotary table device according to claim 1, wherein the rotary drive source is coupled to the other end of the rotary shaft portion in a coaxial relationship via a speed reducer.