JP2002160144A - Rotation indexing device for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation indexing device for a machine tool capable of securing the supporting rigidity of a rotation-side coupling without causing problems on wear due to sliding resistance and on an increasing the number of part items. SOLUTION: The rotation indexing device 10 comprises the rotation-side coupling 21 fixed to a rotation part 11 and a fixation-side coupling 20 fixed to a fixing base 8, both arranged coaxially with each other, a joint coupling 22 opposed to both of the rotation-side and fixation-side couplings 21, 20 in an engageable manner, arranged to be movable between a clamp position, where the rotation-side coupling 21 in engagement is clamped at a rotating angle position and an unclamp position, where it is unclamped, and rollers 40, 41 arranged in upper and lower lines between the rotation-side coupling 21 and the fixation-side coupling 20, the rotation-side coupling 21 being supported by the fixation-side coupling 20 via the roller 40, 41 in lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation index of a machine tool in which a rotating portion to which a work or a tool is mounted is rotatably indexed on a fixed base at a predetermined rotation angle position and clampable at the indexing position. Related to the device.

[0002]

2. Description of the Related Art For example, a horizontal machining center may be provided with a rotation indexing device which can rotate and clamp a processing table on which a work is mounted at a predetermined rotation angle position and perform processing in this state.

As a rotary indexing device of this type, a rotary coupling fixed to the processing table and a fixed coupling fixed to a fixed base are arranged coaxially, and the coupling coupling is connected to the two couplings. There is a three-piece coupling type that is movably disposed between a clamp position where the coupling engages with the coupling and an unclamping position where the engagement is released.

[0004] In the above-mentioned rotary indexing apparatus, there is a case where a rotary side coupling is conventionally arranged outside a fixed side coupling and a roller is interposed between both couplings.
Also, from the viewpoint of increasing the support rigidity of the rotation side coupling,
In both cases of clamping and unclamping, a structure may be employed in which the rotating side coupling is supported by pressing and slidingly contacting the fixed base (for example, Japanese Patent Application Laid-Open No. 7-25653).
No. 8, JP-A-9-19848).

[0005]

However, the above-described conventional rotary indexing device employs a structure in which the rotary coupling is slid on the fixed base. There is a concern that uneven wear may occur. Further, in order to reduce the sliding resistance, a sliding member or a hollow roller may be provided on the sliding surface of the fixed base, which causes a problem that the number of parts increases.

The present invention has been made in view of the above-mentioned conventional circumstances, and does not cause a problem of uneven wear of the sliding portion or a problem of an increase in the number of parts, and can improve the support rigidity of the rotary side coupling. An object of the present invention is to provide a rotation indexing device for a machine tool.

[0007]

According to a first aspect of the present invention, a rotating portion to which a work or a tool is attached is rotatably indexable on a fixed base at a predetermined rotational angle position and clampable at the indexing position. In the rotary indexing device for a machine tool, the rotating side coupling fixed to the rotating portion and the fixed side coupling fixed to the fixed base are coaxially arranged, and the rotating side and fixed side couplings are arranged. A coupling position that meshes with both of the couplings is engaged with both the rotation-side and fixed-side couplings to clamp the rotation-side coupling at the rotation angle position. It is movably disposed between the clamp position and the rolling elements are arranged in a plurality of rows between the rotating side coupling and the fixed side coupling. Through the rolling member is characterized in that supported only by the fixed-side coupling the rotary-side coupling.

According to a second aspect of the present invention, in the first aspect, the rolling elements in each row are formed of columnar rollers, and are disposed so that the rotation axes of the rollers in each row intersect. And

A third aspect of the present invention is characterized in that, in the first or second aspect, the rotation-side coupling is disposed inside the fixed-side coupling.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the rotating side coupling slightly projects toward the coupling side with respect to the fixed side coupling at the time of unclamping. Features.

[0011]

According to the rotary indexing device according to the first aspect of the present invention, the rolling elements are arranged in a plurality of rows between the rotating side coupling and the fixed side coupling, so that the rolling elements act on the rotating portion. The load can be supported by the fixed-side coupling via the rolling elements in each row, and the rigidity of the rotation-side coupling supported by the fixed base can be increased. This eliminates the need for a structure for pressing and slidingly supporting the rotation-side coupling to the fixed base, preventing uneven wear of the sliding portion, eliminating the need for a slide member and a hollow roller, and reducing the number of components.

According to the second aspect of the invention, since the rollers in each row are arranged so that the rotation axes intersect with each other, the clamping force and the load of the rotating portion act on the rollers in each row alternately, so that the rotation-side coupling is provided. Can further increase the support rigidity.

According to the third aspect of the present invention, since the rotating side coupling is disposed inside the fixed side coupling, the outer diameter of the fixed side coupling can be made larger than that of the rotating side coupling. The rigidity can be improved, and the support force of the rotating side coupling at the time of clamping can be increased.

According to the fourth aspect of the present invention, the rotating coupling is slightly protruded from the fixed coupling to the coupling coupling side. Therefore, the coupling coupling makes the rotating coupling extra than the fixed coupling during clamping. By pressing, a preload is applied to the rolling elements in each row, so that the rigidity of support of the rotation-side coupling can be further increased.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 4 are views for explaining a rotary indexing device of a machine tool according to an embodiment of the present invention. FIG. 1 is a sectional view of the rotary indexing device, and FIG. FIG. 3 is a sectional view of a main part showing a clamped state.
Is a sectional view of a main part showing a clamped state of the rotary indexing device,
FIG. 4 is a perspective view of a horizontal machining center equipped with a rotary indexing device. In FIG. 1, the left part of the index axis A shows the unclamped state, and the right part shows the clamped state.

In FIG. 1, reference numeral 1 denotes a horizontal machining center, and a column 3 is disposed at a rear portion 2a of the fixed bed 2 so as to be movable in the X-axis direction (left-right direction). A saddle 4 is disposed so as to be movable in the Y-axis direction (vertical direction), and a spindle head 5 mounted on the saddle 4 with its axis lined horizontally is movable in the Z-axis direction (front-rear direction). Has been established. A spindle 6 is rotatably inserted into the spindle head 5, and a tool (not shown) is removably mounted on the spindle 6. While rotating the main shaft 6 by a main shaft motor (not shown), the X-axis, the Y-axis, and the Z-axis
Predetermined work processing is performed by relative movement in the axial direction.

At the front part 2b of the bed 2, a fixed base 7 is arranged and fixed. A fixed base 8 is provided on the fixed base 7.
Are mounted and fixed, and a processing table 9 is mounted on the fixed base 8 via a rotary indexing device 10. A work (not shown) is mounted on the processing table 9.

As shown in FIG. 1, the rotary indexing device 10 includes a rotary drive mechanism 13 for rotating a rotary table 11 rotatably disposed in the fixed base 8 to a predetermined rotary indexing position. A clamp mechanism 12 for clamping the turntable 11 at the rotation angle position is provided, and the processing table 9 is mounted and fixed on the turntable 11.

The turntable 11 is rotatably supported by a fixed base 8 via a bearing (not shown). Also, the upper peripheral edge 8a of the fixed base 8 and the lower peripheral edge 1 of the turntable 11
1a overlaps with the index axis A in a direction orthogonal to the index axis A, and a seal member 15 is provided between the upper and lower portions 8a and 11a.
Sealed by

The clamp mechanism 12 is disposed in the fixed base 8 with a fixed coupling 20 having an annular shape in plan view and fastened and fixed to the fixed base 8 by bolts 16, and is arranged coaxially inside the fixed coupling 20. An annular rotary coupling 21 in a plan view, which is fixed to the lower surface of the turntable 11 by bolts, and an annular coupling coupling 22 arranged in a plan view so as to face above the two couplings 20, 21. And the coupling 22 is provided on the turntable 1.
1 and is slidably supported in the direction of the index axis A.

As shown in FIG. 2, the rotation-side coupling 21 projects from the fixed-side coupling 20 toward the coupling coupling 22 by a dimension t. That is, the upper end surface of the rotating side coupling 21 is located slightly higher than the upper end surface of the fixed side coupling 20, and the dimension t is 5
It is set to about 15 μm.

At the time of clamping, as shown in FIG.
Both couplings 20 and 21 are set so as to be at the same height position.
The amount of movement of the rotation-side coupling 21 when pressed by 2 is larger than that of the fixed-side coupling 20.

The fixed-side and rotary-side couplings 20, 2
The meshing teeth 20a and 21a are formed on the upper surface of the gear 1 at a predetermined pitch in the circumferential direction. In addition, meshing teeth 22a are formed on the lower surface of the coupling coupling 22 at a predetermined pitch in the circumferential direction so as to be able to mesh with the both meshing teeth 20a, 21a. This coupling 2
Numeral 2 moves up and down between a clamp position for meshing with the meshing teeth 20a, 21a of the fixed-side and rotating-side couplings 20, 21 and an unclamping position for releasing the meshing.

The coupling coupling 22 is slidably inserted in the direction of the axis A into an annular cylinder member 25 which is coaxially disposed outside the coupling coupling 22 in plan view. The cylinder member 25 is supported and fixed by the coupling 22 and the fixed base 8. The above coupling 2
A step portion 22b is formed on an outer peripheral wall of the cylinder member 2, and a convex step portion 25a is formed on an inner peripheral wall of the cylinder member 25, and a space surrounded by these is a hydraulic chamber 26.

The hydraulic chamber 2 is attached to the cylinder member 25.
6, an oil passage 25b for supplying hydraulic oil is formed, and a hydraulic supply source (not shown) is provided at an upstream end of the oil passage 25b.
Is connected. Reference numeral 27 denotes a seal ring for preventing leakage of hydraulic pressure from the hydraulic chamber 26.

When hydraulic pressure is supplied to the hydraulic chamber 26, the coupling coupling 22 is lowered, and the meshing teeth 22a of the coupling coupling 22 are moved to the meshing teeth 20 of the fixed-side and rotary-side couplings 20, 21.
a, 21a. Thereby, the rotation-side coupling 21 is fixed to the fixed-side coupling 20, and the processing table 9 is clamped at a predetermined rotation angle position set by the pitch of the meshing teeth 20a, 21a.

A spring 30 is provided between the coupling 22 and the fixed coupling 20. The spring 30 urges the coupling 22 upward (in the direction of disengagement). When the hydraulic pressure to the hydraulic chamber 26 is released, the coupling coupling 22 is raised by the spring force of the spring 30, and the clamp is released.

The rotary drive mechanism 13 includes a large spur gear 35 fastened and fixed by bolts 34 with a rotation support member 33 interposed on the lower surface of the rotary side coupling 21, and a small spur gear 36 meshed with the large spur gear 35. And a servomotor 37 for driving the small spur gear 36 to rotate. The rotation of the servomotor 37 changes the small spur gear 36 to the large spur gear 3
5, transmitted to the rotation-side coupling 21 and transmitted to the turntable 11 via the rotation-side coupling 21, and the processing table 9 is indexed to a predetermined rotation angle position. The large spur gear 35 is slightly movable in the vertical direction with respect to the small spur gear 36. As a result, it is possible to absorb the descending amount of the dimension t of the rotation-side coupling 21.

A large number of columnar rollers 40 and 41 are arranged between the inner peripheral surface of the fixed coupling 20 and the outer peripheral surface of the rotary coupling 21 in two vertical rows. The rollers 40 and 41 in each row have a cross section formed by a V-groove 20 b formed on the inner peripheral wall of the fixed coupling 20 and a V-groove 21 b formed on the outer peripheral wall of the rotary coupling 21. It is housed in a diamond-shaped space.

The rollers 40 and 41 in each row are arranged so as to be inclined such that the rotation axes 40a and 41a intersect at right angles. More specifically, each roller 40 in the upper row sets a rotation axis 40a and is arranged at an angle of 45 degrees so as to intersect the axis A below, and each roller 41 in the lower row sets a rotation axis 41a. It is arranged at an angle of 45 degrees so as to cross the axis A upward.

The axis of rotation 40 of each of the rollers 40, 41
a, 41a, both end surfaces 40b, 41b and V-groove 20b,
A slight gap is provided between the lubricating oil and the rolling contact surface 21b. Each of the rollers 4
The outer diameter of 0, 41 is slightly larger than the dimension between the contact surfaces of the V-grooves 20b, 21b, specifically, about 5 μm. It is pressed against the surface. In this way, the large spur gear 35, the turntable 11, and the processing table 9 are
The load acting on the workpiece and the clamping force f of the coupling 22 are supported only by the upper and lower rows of rollers 40 and 41.

Next, the operation and effect of this embodiment will be described.

In the clamped state of the processing table 9, hydraulic pressure is supplied to the hydraulic chamber 26, and the meshing teeth 22a of the coupling 22 mesh with the meshing teeth 20a, 21a of the fixed and rotating couplings 20, 21. (See FIG. 3). In this case, the load and the clamping force f applied to the rotating side coupling 21 are borne by the fixed side coupling 20 via the upper and lower rows of rollers 40 and 41.

When indexing to a new angular position from the clamped state, the hydraulic pressure in the hydraulic chamber 26 is released. Then, the coupling coupling 22 is raised by the spring force of the spring 30, and the engagement between the meshing teeth 22a of the coupling coupling 22 and the meshing teeth 20a, 21a of the couplings 20, 21 is released, and an unclamped state is set. .

In the unclamped state, the servo motor 37
Is rotated, and this rotation is transmitted from the rotation side coupling 21 to the turntable 11 via the small and large spur gears 36 and 35, whereby the working table 9 is indexed to a predetermined angular position.
In this case, the rotation-side coupling 21 does not come into contact with the fixed base 8, and therefore, wear due to contact with the fixed base 8 does not occur.

When the rotation-side coupling 21 is indexed to a predetermined angular position, hydraulic pressure is supplied to the hydraulic chamber 26. As a result, the coupling 22 is lowered, and the rotating coupling 21 is connected to the fixed coupling 20 in the same manner as described above.
Fixed to. Thus, the processing table 9 is clamped, and processing is performed in this state.

As described above, according to the present embodiment, the upper and lower two rows of rollers 40 and 41 are disposed between the rotary coupling 21 and the fixed side coupling 20, and the rollers 40 and
Since the load applied to the rotation-side coupling 21 and the clamping force f are borne by 41, the rigidity of the rotation-side coupling 21 with respect to the fixed base 8 can be increased.
This eliminates the need for a conventional structure for supporting the rotation-side coupling with the fixed base, prevents wear due to sliding resistance, and eliminates the need for a slide member and a hollow roller, thereby reducing the number of components.

Further, since the rollers 40 and 41 in each row are arranged so that the rotation axes 40a and 41a cross each other, the clamping force f acts on the rollers 40 and 41 in each row alternately, and the rotation The support rigidity of the side coupling 21 can be further increased.

In the present embodiment, the rotation side coupling 21
Are arranged coaxially inside the fixed side coupling 20, the outer diameter of the fixed side coupling 20 can be increased, the supporting rigidity against the clamping force f can be improved accordingly, and the supporting force of the rotating side coupling 21 can be improved. Can be increased.

In this embodiment, the upper end surface of the rotary coupling 21 is positioned higher than the upper end surface of the fixed coupling 20 by the dimension t. Of the rollers 40, 41 in each row
, The supporting rigidity of the rotation-side coupling 21 can be further increased.

Since the rollers 40 and 41 are arranged in two rows, the roller diameter can be reduced as compared with the conventional one while securing the supporting rigidity, the differential slip ratio is reduced, and the friction coefficient is reduced. be able to.

Also, the rotating coupling 21 can be integrated as the inner ring of the upper and lower rollers 40 and 41 and the fixed coupling 20 can be integrated as the outer ring.
The two axes can be easily matched, and the assembling work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a rotation indexing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing an unclamped state of the rotation indexing device.

FIG. 3 is a sectional view of an essential part showing a clamped state of the rotary indexing device.

FIG. 4 is a perspective view of a horizontal machining center on which the rotary indexing device is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal machining center (machine tool) 8 Fixed base 10 Rotation indexing device 11 Rotation part 20 Fixed side coupling 21 Rotation side coupling 22 Coupling coupling 40, 41 Rollers (rolling elements) 40a, 41a Rotation axis

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Okuma 106 Kitayamayamacho, Yamatokoriyama-shi, Nara Prefecture F-term in Mori Seiki Seisakusho Co., Ltd. 3C028 EE13

Claims (4)

[Claims] 1. A rotary indexing device for a machine tool, wherein a rotary portion to which a work or a tool is attached is rotatably indexed on a fixed base at a predetermined rotational angle position and clampable at the indexing position. The rotating side coupling fixed to the part and the fixed side coupling fixed to the fixed base are arranged so as to be coaxial,
A coupling position which meshes with both the rotation side and the fixed side coupling so as to be able to mesh with both the rotation side and the fixed side coupling, and clamps the rotation side coupling at the rotation angle position. And an unclamping position for releasing the clamp. The rolling element is arranged in a plurality of rows between the rotating coupling and the fixed coupling. A rotary indexing device for a machine tool, wherein the rotary coupling is supported only by a fixed coupling via a moving body. 2. The machine tool according to claim 1, wherein the rolling elements in each row are formed of cylindrical rollers, and are arranged so that the rotation axes of the rollers in each row intersect. Rotary indexing device. 3. The rotation indexing device for a machine tool according to claim 1, wherein the rotation-side coupling is disposed inside a fixed-side coupling. 4. The machine tool according to claim 1, wherein the rotating-side coupling projects slightly toward the coupling coupling with respect to the fixed-side coupling during unclamping. Rotary indexing device.