JP6832391B2 - Double rotary table device and tilted double rotary table device - Google Patents

Description

The present invention relates to a double indexing device provided with two rotary tables and rotating these rotary tables at the same time for indexing.

The technique described in Patent Document 1 is known as an indexing table having two rotary tables. The indexing table of Patent Document 1 includes a double rotary table arranged in parallel so as to be adjacent to each other, a worm wheel to be connected to each rotary table, and a long rotating shaft extending along the tangent line of these worm wheels. And two worms provided at intervals on this rotation axis. Each worm is a double lead worm that meshes with the worm wheel.

Japanese Unexamined Patent Publication No. 2002-066876

Not limited to the indexing table described in Patent Document 1, in a general double indexing table, the double rotary table is rotated in the same direction by the rotation of one rotation axis, and the indexing angle is set. .. Therefore, a general double indexing table is advantageous for simultaneously producing two parts having the same shape.

On the other hand, parts that are left-right different (mirror image), such as undercarriage parts of automobiles, are known. As a part of the mirror image, for example, there is a steering knuckle that rotatably supports the left and right wheels. The steering knuckle for the left wheel and the steering knuckle for the right wheel have symmetrical shapes and form a pair. The brake caliper of the left wheel disc brake device and the brake caliper of the right wheel disc brake device are also mirror image parts.

With the conventional double indexing table, two workpieces having the same shape can be created at the same time, but mirror image parts cannot be created at the same time.

An object of the present invention is to provide an apparatus suitable for simultaneous production of mirror image parts in view of the above circumstances.

For this purpose, the dual rotary table device according to the present invention includes a first and second rotary tables arranged in parallel on the left and right and paired with each other, and first and second rotary tables provided on the first and second rotary tables, respectively. The first rotary is provided with a worm wheel, a first worm that meshes with the first worm wheel, a second worm that meshes with the second worm wheel, and a drive mechanism that simultaneously drives the first and second worms at a constant speed. The table and the second rotary table rotate at a constant velocity in opposite directions and are indexed symmetrically.

According to the present invention, since the first rotary table and the second rotary table are symmetrically indexed at a predetermined angle, if the workpieces are chucked to the first rotary table and the second rotary table, respectively, one step. You can create mirror image parts with.

The embodiment of the drive mechanism is not particularly limited. As one aspect of the present invention, the drive mechanism is arranged 180 ° opposite to the first drive shaft so as to sandwich the first drive shaft with the first drive shaft extending along the tangent line of the first worm wheel. It has a second drive shaft that is driven at a constant velocity at the same time, the first worm is provided on the first drive shaft, the second worm is provided on the second drive shaft, and the twisting direction of the first worm and the second worm The twisting directions are equal. According to this aspect, the first rotary table is indexed at + α °, the second rotary table is indexed at −α °, and the second rotary table is indexed symmetrically. The first and second drive shafts driven at a constant speed mean that the first and second drive shafts are driven at the same rotation speed by the drive source of the drive mechanism.

As another aspect of the present invention, the drive mechanism has a common drive shaft extending along the common tangent of the first and second worm wheels, the first worm and the second worm are provided on the common drive shaft, and the first worm The twisting direction of the second worm is opposite to that of the second worm. Also in such a situation, the first rotary table is indexed at + α °, the second rotary table is indexed at −α °, and the second rotary table is indexed symmetrically.

The tilting double rotary table device of the present invention includes the above-mentioned double rotary table device and a tilting mechanism for tilting the double rotary table device at an arbitrary angle about a predetermined axis, and mirrors the upper half of the sphere. in the image, a first workpiece to be chucked to the first rotary table, Ru is simultaneously tilted or rotated the second workpiece to be chucked to the second rotary table. According to this aspect, since the inclined shaft is provided, the degree of freedom in modeling the first and second workpieces is improved. The upper half of the sphere is paired with the lower half of the sphere (the back side of the rotary table), and on the front side of the rotary table, the circumferential angle around the axis of the rotary table, the intersection angle with the axis, and the axis from the axis. The coordinate space indicated by the distance.

As described above, according to the present invention, the parts of the mirror image can be produced at the same time, which contributes to shortening of the manufacturing process and efficiency of production control.

It is an overall view which shows the double rotary table apparatus which becomes one Embodiment of this invention. It is an overall view which shows the double rotary table apparatus which becomes the other embodiment of this invention. It is an overall side view which shows the double rotary table apparatus which becomes one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall view showing a double rotary table device according to an embodiment of the present invention, and shows an internal structure of the double rotary table device. FIG. 3 is an overall side view showing the dual rotary table device according to the embodiment of the present invention, and shows a state seen from the outer diameter side of the rotary table. The dual rotary table device 10 includes a first rotary table 11, a second rotary table 12, a first worm wheel 13, a second worm wheel 14, a first worm 15, a second worm 16, and a case 21. The drive mechanism 22, the tilt table 31, and the tilt motor 32 are provided.

The first rotary table 11 and the second rotary table 12 are circular tables, and the axes O ₁ and O ₂ are arranged in parallel so as to be parallel to each other, and are rotatably supported by the case 21. FIG. 1 shows the back surfaces of the first rotary table 11 and the second rotary table 12. The surfaces of the first rotary table 11 and the second rotary table 12 (not shown) can chuck the workpiece.

The first worm wheel 13 and the second worm wheel 14 are coaxially coupled to the first rotary table 11 and the second rotary table 12, respectively. The first worm wheel 13 and the second worm wheel 14 are arranged on the same plane inside the case 21.

The first worm 15 and the second worm 16 are worm screws having a smaller diameter than the first worm wheel 13 and the second worm wheel 14, and mesh with the first worm wheel 13 and the second worm wheel 14, respectively. Rotately drive the wheel. The first worm 15 and the second worm 16 have the same shape and the same dimensions, and have the same twisting direction. The first worm 15 and the second worm 16 are double-lead worm gears, which can move in the axial direction of the drive shaft to adjust the backlash with the worm wheel.

The first worm 15 is a cylindrical body, and gear teeth of the worm are formed on the outer peripheral surface of the cylindrical body. The first drive shaft 17 of the drive mechanism 22 is passed through the central hole of the cylinder. The first drive shaft 17 extends along the tangent to the first worm wheel 13. The first worm 15 transmits the torque of the first drive shaft 17 to the first worm wheel 13.

The second worm 16 is also a cylinder similar to the first worm 15, and the tip shaft 18b of the drive mechanism 22 is passed through the center hole of the cylinder. At the end of the tip shaft 18b, the end of the root shaft 18c, which is a separate component, is arranged so as to abut against each other. These ends are selectively connected and disconnected by the coupling 18d. The tip shaft 18b and the root shaft 18c form a long second drive shaft. The root shaft 18c extends along the tangent line of the first worm wheel 13, but is separated from the first worm wheel 13 so as not to mesh with the first worm wheel 13. The tip shaft 18b extends along the tangent to the second worm wheel 14. By coupling the tip shaft 18b and the root shaft 18c by the coupling 18d, the second worm 16 transmits the torque of the pinion 24, which will be described later, to the second worm wheel 14 via the root shaft 18c.

As shown in FIG. 1, the first drive shaft 17 and the root shaft 18c are arranged in parallel so as to sandwich the first worm wheel 13 from one and the other in the radial direction of the first worm wheel 13. The first drive shaft 17 and the second drive shaft (tip shaft 18b, root shaft 18c) of the present embodiment extend in parallel with each other. The extending direction of the first drive shaft 17 and the second drive shaft is equal to the arrangement direction of the double first rotary table 11 and the second rotary table 12. The first drive shaft 17 and the second drive shaft are arranged inside the case 21 and are rotatably supported by the case 21 via bearings.

A pinion 23 of the drive mechanism 22 is provided at the root end of both ends of the first drive shaft 17 on the side farther from the second rotary table 12. Of both ends of the root shaft 18c, a pinion 24 of the drive mechanism 22 is provided at the root end opposite to the tip shaft 18b.

The drive mechanism 22 further includes idle gears 25 and 26, an output gear 27, a motor shaft 28, and an electric motor 29. These parts are arranged on the root side of the first drive shaft 17, and the electric motor 29 is attached and fixed to the end of the case 21. The opposite end of the case 21 is supported by the tilt table 31.

The motor shaft 28 is provided at the center of the electric motor 29 and outputs the torque of the electric motor 29. An output gear 27 is provided at the tip of the motor shaft 28 protruding from the electric motor 29. The output gear 27 is interposed between the pinions 23 and 24 and is rotatably supported by the end of the case 21. The torque of the electric motor 29 branches from the output gear 27 and is transmitted to the pinions 23 and 24 to drive the first worm 15 and the second worm 16 at a constant speed at the same time. The pinions 23, 24, idle gears 25, 26, and output gear 27 are external gears and helical gears. The pinions 23 and 24 have the same diameter and form a pair. The idle gears 25 and 26 have the same diameter and form a pair. As shown in FIG. 1, these paired gears are arranged symmetrically with respect to the rotation axis X of the motor shaft 28.

The first worm wheel 13 and the second worm wheel 14 have the same shape and the same dimensions, and have teeth in the same twisting direction. Therefore, as shown by arrows in FIG. 1, the first rotary table 11 and the second rotary table 12 rotate in opposite directions at the same rotation speed as the motor shaft 28 rotates, and are indexed.

The tilt table 31 is an L-shaped mechanism shown in FIG. 1, and includes a tilt motor 32 as a drive source. As shown in FIG. 3, the main body of the drive mechanism 22 and the tilt table 31 are supported at both ends of the base 33. At both ends, the case 21 is rotatably connected to the main body of the drive mechanism 22 by the tilt table 31 about the axis X, and is separated from the base 33 and supported by the main body of the drive mechanism 22 and the tilt table 31. Will be done.

The tilt table 31 tilts the double first rotary table 11 and the second rotary table 12 to a desired angle by rotating the case 21 around the axis X. As a result, the first rotary table 11 and the second rotary table 12 are simultaneously set to the same inclination angle.

The first rotary table 11 and the second rotary table 12 are arranged so as to be aligned along the axis X. The axis O ₂ of the axis O ₁ and the second rotary table 12 of the first rotary table 11, perpendicular to the axis X, extending parallel to each other.

An end mill (not shown) is formed in a state in which the first rotary table 11 and the second rotary table 12 are _{indexed at a predetermined angle around the axis O 1} and the axis O _{2, respectively, and are simultaneously inclined at a predetermined angle around the axis X.} By cutting the workpieces (not shown) chucked on the surfaces of the first rotary table 11 and the second rotary table 12, each workpiece is cut in the coordinate spaces of the _{upper spheres S 1} and S _2. Furthermore, each work is machined with a mirror image.

Note that the coordinate space of the sphere on the half S _1, the circumferential angle of the axis line O ₁ around the first rotary table 11 surface side, and intersection angle between the axis O _1, polar coordinates represented by the distance from the axis O ₁ Refers to the system. The same applies to the coordinate space of the upper half S _{2 of the sphere.}

According to the double rotary table device 10 of the present embodiment, the first rotary table 11 is rotated in the direction opposite to the second rotary table 12 and is indexed as the second rotary table 12 is indexed and rotated. As a result, the two workpieces can be chucked into the first rotary table 11 and the second rotary table 12, respectively, to simultaneously create mirror image parts.

Next, other embodiments of the present invention will be described. FIG. 2 is an overall view showing the double rotary table device 20 according to another embodiment of the present invention, and shows the internal structure of the double rotary table device 20. FIG. 3 is common to other embodiments of the present invention. Regarding the other embodiments, the configurations common to the above-described embodiments are designated by the same reference numerals and the description thereof will be omitted, and the different configurations will be described below. In the embodiment of FIG. 1, two drive shafts are provided, such as a first drive shaft 17 and a second drive shaft (tip shaft 18b, root shaft 18c) arranged in parallel so as to sandwich the worm wheel, but other In the embodiment, only one drive shaft (tip shaft 18b, root shaft 18c) is provided. Such a drive shaft becomes a common drive shaft that simultaneously drives the first worm wheel 13 and the second worm wheel 14.

The root shaft 18c is passed through the central hole of the first worm 35. The first worm 35 is a cylindrical body like the second worm 16, and rotates together with the root shaft 18c. However, the twisting direction of the teeth formed on the outer peripheral surface of the first worm 35 is opposite to that of the second worm 16. For example, the first worm 35 is twisted in the clockwise direction and the second worm 16 is twisted in the counterclockwise direction from the root side to the tip side of the root shaft 18c.

According to the double rotary table device 20, the first rotary table 11 rotates in the direction opposite to that of the second rotary table 12 and is indexed as the second rotary table 12 is indexed and rotated. As a result, the two workpieces can be chucked into the first rotary table 11 and the second rotary table 12, respectively, to simultaneously create mirror image parts.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. It is possible to make various modifications and modifications to the illustrated embodiment within the same range as the present invention or within the same range. For example, a part of the configurations may be extracted from the above-described 1 embodiment, another part of the configurations may be extracted from the above-mentioned other embodiments, and these extracted configurations may be combined.

The present invention is advantageously used in machine tools.

10 Double rotary table device, 11 1st rotary table,
12 2nd rotary table, 13 1st worm wheel,
14 2nd worm wheel, 15 1st worm,
16 2nd worm, 17 1st drive shaft, 18b tip shaft,
18c root shaft, 21 case, 22 drive mechanism.

Claims (4)

The first and second rotary tables arranged in parallel on the left and right and paired with each other,
The first and second worm wheels provided on the first and second rotary tables, respectively,
The first worm that meshes with the first worm wheel and
The second worm that meshes with the second worm wheel and
A drive mechanism for simultaneously driving the first and second worms at a constant speed is provided.
A double rotary table device in which the first rotary table and the second rotary table are rotated in opposite directions and indexed symmetrically. The drive mechanism is arranged on the side opposite to the first drive shaft so as to sandwich the first drive shaft extending along the tangent line of the first worm wheel and the first worm wheel, and is arranged along the tangent line of the second worm wheel. Has a second drive shaft that extends
The first worm is provided on the first drive shaft.
The second worm is provided on the second drive shaft.
The dual rotary table device according to claim 1, wherein the twisting direction of the first worm is equal to the twisting direction of the second worm. The drive mechanism has a common drive shaft extending along a common tangent of the first and second worm wheels.
The first worm and the second worm are provided on the common drive shaft.
The dual rotary table device according to claim 1, wherein the twisting direction of the first worm and the twisting direction of the second worm are opposite to each other. The dual rotary table apparatus according to any one of claims 1 to 3.
It is provided with an inclination mechanism for inclining the double rotary table device at an arbitrary angle about a predetermined axis.
A mirror image of the hemisphere, the first and the workpiece to be chucked to the first rotary table, wherein Ru is simultaneously tilted or rotated the second workpiece to be chucked to the second rotary table, the inclined dual rotary table device.

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