JP2003181705A - Rotary tool turret and opposed double main spindle lathe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary tool turret which is small-sized, has a small number of parts, and does not generate noise, and to provide an opposed double main spindle lathe having the same. <P>SOLUTION: A rotation transmitting shaft 4 connected to a tool driving shaft 13 in a turret case 5 is arranged inside a hollow indexing shaft 2 having the turret case 5 fixed to the tip of the hollow indexing shaft 2. A large-sized tool driving motor 19, which needs high speed rotation and high torque, is arranged at a position opposed to the turret case side with its output shaft 31 aligned with the axis of the rotation transmitting shaft 4. The tool driving motor 19 is able to control a stop phase, and to hold a stop position. Because the rotary tool turret 37 has not a portion largely extending toward this side or upward, a slide door 39, etc., are able to be arranged nearer a workpiece. Accordingly, the floor space for the lathe can be reduced, and accessability of an operator to the workpiece is improved, and an excellent appearance can be obtained. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool turret on which a rotary tool can be mounted and a two-spindle facing lathe equipped with such a tool turret, and is particularly characterized by a drive mechanism for the rotary tool mounted on the turret. The present invention relates to the turret and the lathe.

[0002]

2. Description of the Related Art As is well known, a lathe has a spindle for gripping and rotating a workpiece and a tool rest for mounting a tool, and the tool rest has a tool turret capable of mounting a plurality of tools. It is normal. Further, a rotary tool turret that can be fitted with a rotary tool such as a drill or a milling cutter has become popular. In classic lathes that change tools manually, the turret is located in front of the spindle, but there is a tool turret with a tool turret that does not require manual tool changes during machining, A tool rest equipped with a tool changer is usually arranged on the back side of the spindle in order to ensure the accessibility of the worker to the work.

FIG. 3 is a schematic sectional view showing an example of a conventional rotary tool turret. In the illustrated example, a hollow indexing shaft 2, a hollow fixed shaft 3, and a rotation transmitting shaft 4 are coaxially supported by a support frame 1 fixed to a tool rest. The hollow indexing shaft 2 is rotatable with respect to the support frame 1, a turret case 5 is fixed to the tip thereof, and an indexing gear 6 is fixed to the base end side. The index gear 6 is
It meshes with the drive gear 8 fixed to the output shaft of the reduction gear motor 7 for indexing mounted on the side surface of the support frame 1. At the front end of the support frame 1 and the back surface of the turret case 5,
Fixed side gear 9 and rotating side gear 10 for fixing the indexing position
Are fixed side by side toward the base end side of the hollow indexing shaft 2, and the floating surface gear 11 faces them. The idle surface gear 11 is a piston 4 fitted in a ring-shaped cylinder 41 formed between the support frame 1 and the hollow indexing shaft 2.
2 is formed on the turret case side end face, and when the turret is rotated to index the tool, the piston 42
When the indexing tool is fixed by disengaging the idle surface gear 11 by moving to the left in the figure, the idle surface gear 11 is engaged with the fixed side gear 9 and the rotating side gear 10 at the same time by moving right. As a result, the rotary side gear 10 is fixed.

The hollow fixed shaft 3 is rotatably supported by the hollow indexing shaft 2, and its base end is a power lock (fixing device).
It is connected to the support frame 1 via 14 and the like, and cannot rotate and move in the axial direction. An inner case 12 built in the turret case 5 is fixed to the tip of the hollow fixed shaft 3, and a tool drive shaft 13 is axially supported by the inner case 12 in a direction perpendicular to the turret shaft. Therefore, the tool drive shaft 13 does not rotate even when the turret case 5 rotates, and always faces a fixed direction (workpiece direction).

The rotation transmission shaft 4 is rotatably supported by the hollow fixed shaft 3 and its tip is connected to the driving bevel gear 15. The drive bevel gear 15 meshes with a driven bevel gear 16 provided on the tool drive shaft 13. A toothed belt pulley 17 is fixed to the base end of the rotation transmission shaft 4, and a knock hole 18 is further provided at one position on the back side circumference thereof. The toothed belt pulley 17 is a toothed belt pulley 2 fixed to the output shaft of a tool driving motor 19 mounted on the side surface of the support frame 1.
0 is connected by a toothed belt 21 (see FIG. 4). The support frame 1 includes a knock pin 22 that advances and retreats in opposition to the knock hole 18, and a knock cylinder 23 that advances and retracts the knock pin 22.
When the and pins are mounted and the knock pin 22 is advanced, the rotation of the rotation transmission shaft 4, and thus the tool drive shaft 13 meshed with the rotation transmission shaft 4, is fixed.

When the rotary tools 29 such as a drill and a milling cutter are mounted on the turret, those tools are mounted on the tool mounting shaft 25 of the rotary tool holder 24, and a tool mounting station provided on the outer periphery of the turret case 5 is mounted. Attach to. The base end of the tool mounting shaft 25 has a diametrical protrusion 26.
On the other hand, the tip of the tool drive shaft 13 is provided with a corresponding diametrical groove 27. When the rotary tool holder 24 is attached to the turret case 5, the protrusion 2
6 and the groove 27 are fitted to each other, and the rotation of the tool driving shaft 13 is transmitted to the tool mounting shaft 25.

When the turret case 5 is rotated to index another tool, the protrusion 26 must be disengaged from the groove 27. Therefore, a motor capable of controlling the stop phase is used as the tool driving motor 19 so that the tool driving shaft 13 always stops with the groove 27 in the circumferential direction. On the other hand, a circumferential groove 28 for guiding the projection 26 of the tool mounting shaft is provided on the circumferential surface of the inner case 12, and when the rotary tool moves to another position, the rotation of the projection 26 causes the circumferential groove of the inner case to rotate. 28
The direction of the protrusion 26 is prevented from changing by being prevented by. Therefore, when the rotary tool is indexed again to the machining position on the extension of the tool drive shaft 13, the projection 26 and the groove 27 are fitted to each other without collision.

The above-described knock hole 18 and knock pin 22 prevent the tool driving shaft 13 from unnecessarily rotating and obstructing the re-fitting of the projection 26 and the groove 27 when the rotary tool is not driven. It is provided to fix the rotation transmission shaft 4. Therefore, when the tool drive motor 19 stops at a predetermined phase, the knock pin 22 is advanced to fix the rotation transmission shaft 4, and when the rotary tool is driven, the knock pin 22 is retracted and then the tool drive motor 19 is rotated. Let

[0009]

As described above, the tool rest of the lathe equipped with the tool turret is arranged on the back side of the spindle. This arrangement is also common in a two-spindle facing lathe, but if two turrets corresponding to each of the two main spindles are arranged on the back side of the main spindle, the movement of one of the turrets in the main spindle direction is prevented. It is not possible to process the work, which is limited by the other tool rest, for example, the work gripped by the left main spindle, by simultaneously using the two tools respectively mounted on the left and right tool rests. In a two-spindle facing lathe equipped with three turrets, one turret is provided on the front side of the spindle, and this third turret can be moved with a large stroke from the left spindle to the right spindle. It is general that both the work on the left spindle and the work on the right spindle can be machined by a tool mounted on the third tool post.

As described above, in the two-spindle facing lathe, there is a demand for mounting one of the turret turrets on the front side of the spindle. However, according to the structure of the conventional rotary tool turret described above, the indexing motor 7 and the tool driving motor 19 are mounted on the side surface of the support frame 1 of the turret, and the tool driving motor 19 requires high rotation and high torque. Therefore, the motor becomes large, and therefore the motor is in a state of projecting further to the front side or the upper side of the tool turret arranged on the front side of the spindle.

As described above, the tool turret arranged on the front side of the spindle hinders the operator's approach to the work. When the tool turret on the front side of the spindle is a rotary tool turret, the tool drive motor further projects to the front side or upward, which further impedes the accessibility of the operator and increases the size of the lathe. Furthermore, since the turret of the above conventional structure has a complicated structure and many parts of the tool drive system,
There is a problem that the rotational inertia becomes large, the rise time when driving the tool is long, and the noise becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a compact rotary tool turret having a small number of parts and a low noise, and a two-spindle facing lathe equipped with the rotary tool turret.

[0013]

A rotary tool turret of the present invention comprises a hollow indexing shaft 2 axially supported on a rotary axis parallel to a main shaft, and a rotary transmitting shaft 4 for driving the rotary tool located inside thereof. It has and. A turret case 5 is fixed to the tip of the hollow indexing shaft 2, and a rotation transmission element (gear or toothed belt pulley) connected to an indexing motor 7 on the base end side thereof.
6 is provided. The tip of the rotation transmission shaft 4 has a bevel gear pair 1
Tool drive shaft 1 in turret case 5 via
It is connected to 3. The tool drive shaft 13 is provided with an engagement element (groove) 27 that engages with the tool attachment shaft 25 of the rotary tool holder that is attached to and detached from the turret at the tip. The tool drive motor 19 is arranged on the side opposite to the turret case with its output shaft 31 aligned with the axis of the rotation transmission shaft 4, and the output shaft and the base end of the rotation transmission shaft 4 are connected by a coupling 32. ing. The tool drive motor 19 is an electric motor capable of controlling the stop phase by an absolute encoder or the like and capable of holding the stop position.

The rotary tool turret of the present invention described above is a large tool drive motor 1 which requires high rotation and high torque.
Since 9 is arranged on the side of the turret opposite to the turret case on the same axis as the turning axis of the turret, there is no large protruding portion on the side of the turret indexing shaft, which is compact and the number of parts is small. Since the tool drive system is simplified, noise is reduced and rotational inertia is also reduced, so that the tool rotation can be started and stopped at a higher speed, and the machining efficiency is improved.

The two-spindle facing lathe according to the present invention is a two-spindle facing lathe provided with two spindles opposed to each other on the same axis and rotary tool turrets arranged on the back side and the front side of these spindles. At least the rotary tool turret on the front side of the spindle is the above-described rotary tool turret of the present invention.

In the above-described two-spindle facing lathe according to the present invention, the rotary tool turret 37 arranged on the front side of the main shaft in order to improve the processing range or the processing efficiency has a portion projecting largely to the front side or the upper side. Therefore, the slide door 39 and the like provided on the front side of the machining area of the lathe can be provided closer to the work. For example, as shown in FIG. 2, by making the lower part of the slide door 39 into an arcuate cross section so as to cover the compact front side rotating tool turret 37, it is possible to reduce the installation space of the lathe and at the same time to the work. Improved operator accessibility,
A lathe with an excellent design can be obtained. By providing the rotary tool turret 37 having the above-described structure provided on the front side of the main spindle with a large stroke in the main spindle direction, a compact, easy-to-maintain, two-spindle facing lathe capable of various machining operations is provided. be able to.

[0017]

1 is a schematic sectional view showing an embodiment of a rotary tool turret of the present invention. In the figure, the same members as those of the conventional device shown in FIG. 3 are designated by the same reference numerals. The structure of the hollow indexing shaft 2 and the members related to the hollow indexing shaft 2, such as the turret case 5, the indexing motor 7 and the rotation transmission devices 6 and 8 thereof, and the surface gear couplings 9, 10 and 11 connected to the hollow indexing shaft 2, 3 is the same as the conventional structure shown in FIG. Hollow fixed shaft 3 and inner case 1 related thereto
2 and the structure of the portion of the rotation transmission shaft 4 on the turret case side are the same as the conventional structure of FIG.

In the conventional structure, the tool drive motor 19 arranged on the side surface of the support frame 1 has its output shaft 31 aligned with the axis of the rotation transmission shaft 4 and is fixed to the side opposite to the turret case of the support frame 1. Is provided. The output shaft 31 of the tool drive motor and the base end of the rotation transmission shaft 4 are
It is directly connected by a coupling 32. Tool drive motor 1
9 has a stop phase control means for keeping the direction of the groove 27 at the tip of the tool drive shaft 13 constant, as in the conventional case. Further, the tool drive motor 19 used in the present invention is
A means for fixing the output shaft 31 when stopped is provided. The tool drive shaft 13 is fixed by this fixing means.
This is done by operating a mechanical or electrical brake built into the 9.

By adopting a motor having such a shaft holding means, the knock hole 18, the knock pin 22 and the knock cylinder 23, which have been provided in the conventional device, become unnecessary. Further, by directly connecting the tool drive motor 19 to the rotation transmission shaft 4 by the coupling 32, the two toothed belt pulleys 17 and 20 and the toothed belt 21 are replaced by one coupling 32, and the number of parts is reduced. However, due to the reduction of the rotational inertia, the rise and fall times of tool rotation are shortened, and the noise during use of the rotary tool is also reduced.

FIG. 2 is a schematic side view of a two-spindle facing lathe according to the present invention, in which two spindles are arranged on the spindle axis 35 in the direction perpendicular to the plane of the drawing.
The main shafts face each other, the upper rotary tool turret 36 is arranged on the upper back side (upper left in the figure), and the lower rotary tool turret 37 is arranged on the lower front side. The upper and lower rotary tool turrets 36 and 37 are each given a large movement stroke in the spindle direction (the direction perpendicular to the paper surface of FIG. 2), and the left spindle and the upper turret located on the front side of the paper surface of FIG. In addition to the combination of the right spindle and the lower turret, which is located at the left, various machining is possible by combining the left spindle and the lower turret, the right spindle and the upper turret, the left spindle and the upper and lower turrets, and the right spindle and the upper and lower turrets. Is.

By using the rotary tool turret of the present invention as the lower rotary tool turret 37, only the protrusion by the relatively small indexing motor 7 is projected to the side surface of the turret, so that the main shaft axis 35 is in front. The space required for moving the rotary tool turret 37 on the side can be reduced, and the front cover and the slide door 39 that cover the machining area 38 of the workpiece, especially the lower part of the slide door located at the foot of the operator, have an arc shape. As a result, the machine can be installed closer to the main axis, so that the installation area of the machine can be reduced and the operator's proximity to the machine center can be improved, which facilitates maintenance and inspection.

In the rotary tool turret of the present invention, when the power of the lathe is not turned on, the rotation transmitting shaft 4 is in a state where it can freely rotate by an external force. Therefore, when the power of the lathe is turned off, the direction of the groove 27 at the tip of the tool drive shaft 13 may be displaced. Therefore, when operating the lathe, the tool drive motor 19 is given a positioning command for the output shaft by the first turret indexing command after the power is turned on, the direction of the groove 27 is set to the correct direction, and then the holding command is issued. Perform the turret indexing with the output shaft fixed while being given. While the power of the lathe is turned on, the direction of the groove 27 of the tool drive shaft at the time of turning the turret is always set to a predetermined direction by the stop phase control of the tool drive motor 19 and the phase holding operation of the output shaft at the time of stop. You can keep it.

When machining with a rotary tool, the desired rotary tool is indexed, the projection 26 of the rotary tool is fitted into the groove 27 of the tool drive shaft, and then the holding of the tool drive motor is released. When the predetermined machining is completed, the tool driving motor 19 is given a stop command to control the stop phase to control the groove 27 of the tool driving shaft in the circumferential direction. Immediately after stopping the drive motor, a holding current for the tool drive motor 19 is applied to hold the stop position of the output shaft.

[0024]

According to the present invention described above, a rotary tool turret having a small amount of lateral protrusion of a turret tool post, a small number of parts, a short tool start and stop time, and a low noise is provided. it can. Further, according to the two-spindle facing lathe in which the rotary tool turret of the present invention is mounted on the tool rest on the front side of the spindle, in a two-spindle facing lathe capable of various machining operations, the installation area is small, and the operator's center to the machine part There is an effect that a machine with excellent accessibility can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a rotary tool turret.

FIG. 2 is a schematic side view of an embodiment of a two-spindle facing lathe.

FIG. 3 is a schematic sectional view of a conventional rotary tool turret.

FIG. 4 is a schematic front view of a conventional rotary tool turret.

[Explanation of symbols]

2 Hollow indexing shaft 4 rotation transmission shaft 5 turret case 13 Tool drive shaft 15 Drive bevel gear 16 Driven bevel gear 19 Tool drive motor 25 Drive mounting shaft 27 groove 31 Output shaft 32 coupling 37 Lower rotating tool turret

Claims (3)

[Claims] 1. A hollow indexing shaft (2) axially supported on a rotation axis parallel to the main shaft, a rotation transmission shaft (4) for driving a rotary tool located inside the hollow indexing shaft, and a hollow indexing shaft of the hollow indexing shaft. The turret case (5) fixed to the tip, the tool drive shaft (13) axially supported in the turret case (5), the tip of the rotation transmission shaft (4) and the tool drive shaft (13). In a rotary tool turret equipped with a pair of bevel gears (15, 16) to be connected, a rotary tool drive motor (19)
Is arranged on the side opposite to the turret case with the output shaft (31) aligned with the axis of the rotation transmission shaft (4), and the output shaft (31) and the base end of the rotation transmission shaft (4) are coupled. A rotary tool turret connected at (32). 2. An engagement element (2) for engaging with a tool mounting shaft (25) of a tool holder for holding a rotary tool at a tip of a tool driving shaft (13).
The rotary tool turret according to claim 1, further comprising (7), wherein the tool drive motor (19) is an electric motor capable of controlling a stop phase and capable of holding a stop position. 3. A two-spindle facing lathe equipped with two spindles arranged opposite to each other on the same axis, and a rotary tool turret arranged on the back side and the front side of these spindles, at least a rotary tool on the front side of the spindle. The turret (37) is claim 1 or 2.
A two-spindle facing lathe, which is the described rotary tool turret.