JP2578029B2 - Turret - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turret tool rest used for a machine tool such as a lathe.

[0002]

2. Description of the Related Art Conventionally, a lathe tool post is provided on a tool post main body 101 as shown in FIG. 4 with a turning shaft 104 integrally having a piston 103 inserted into a clamping cylinder 102 so as to be rotatable and axially movable. After the turret 105 is fixed to the tip of the turning shaft, a pair of crown gear-type clutches 106 are provided on the main body 101 and the turret 105, and after the clutch 106 is disengaged by supplying pressure oil to the rear chamber of the cylinder 102. The turret 105 is turned by the drive motor 107 and the electromagnetic switching valve 108 is switched to supply the hydraulic oil to the cylinder 1.
Usually, the clutch 106 is supplied to the front chamber 02 to engage the clutch 106 and perform clamping.

[0003]

The tool post for lathe described in the prior art requires an expensive clutch, a hydraulic mechanism and a turning drive mechanism, and the cost is increased due to the complexity of the mechanism, and the responsiveness is deteriorated. And the operation becomes slower. SUMMARY OF THE INVENTION The present invention has been made in view of these problems of the prior art, and has as its object to provide a turret tool rest having a simple structure and a high operation speed.

[0004]

In order to achieve the above object, a turret of the present invention has a first bevel gear provided with a first bevel gear so that a meshing thrust is in a turret retracting direction with a turret turning shaft. Two driving gears having a self-locking reduction gear drive side gear in which two meshing second bevel gears are rotatably provided on the tool rest main body and a passive side gear is concentrically fixed to the second bevel gear. A motor is provided on the tool post main body,
A timer is provided for setting a time for simultaneously starting the two drive motors in the opposite directions. After the turret is indexed, the drive motors are started in the opposite directions for a set time and the turret is pulled in by the thrust of the first bevel gear to perform clamping. The clamping force is maintained by the self-locking action of the speed reducer.

[0005]

The second bevel gear is simultaneously rotated in the same direction to index the turret, and after completion of the indexing, the two drive motors are simultaneously activated in opposite directions for a timer set time, so that the first bevel gear is rotated. An axial meshing thrust is generated to pull in the turret turning shaft, press the turret end surface against the turret body end surface to perform clamping, and maintain the clamping force by the self-locking action due to the twist angle of the speed reducer such as worm and worm wheel. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. In the tool post of FIG. 1, a turret pivot 3
Are rotatably fitted, and a turret 4 is concentrically fixed to the tip of the turning shaft 3.

The turning shaft 3 has a first bevel gear 5 integrally, and an encoder 6 is fixed concentrically to the rear end. The main body 1 has two second bevel gears 7 perpendicular and symmetrical with respect to the turning shaft 3.
A and 7B are rotatably supported by a plurality of bearings.
It is meshed with the bevel gear 5.

The second bevel gears 7A, 7B integrally have worm wheels 8A, 8B.
8B is a worm 11 fitted to the output shafts of two motors 9A and 9B fixed to the main body 1 as shown in FIGS.
A and a sensor 11 for detecting the turning angle of the turret are fixed to the corresponding position of the engorder 6 of the main body, and set a time when the two motors 9A and 9B are activated in opposite directions, not shown. A timer is provided.

Next, the operation of this embodiment will be described.
When the turret 4 is indexed for rotation, two motors 9
A and 9B are simultaneously rotated in the same direction when viewed from the output shaft side, and the second bevel gears 7A and 7B are rotated via the worms 11A and 11B and the speed reducers of the worm wheels 8A and 8B, and the first bevel gear 5 is rotated via the first bevel gear 5. To rotate the turret 4. And sensor 1
Positioning is performed at a position where the turning angle of the turret detected by step 2 coincides with the command turning angle.

Next, in the case of clamping, after the positioning index is completed, the two motors 9A and 9B are simultaneously activated in opposite directions viewed from the output shaft side for a timer set time, for example, 1 to 2 seconds. The large torque expanded by the reduction ratio of the worm and worm wheel acts on the meshing surfaces of the first and second bevel gears to generate a thrust F in a direction in which the turning shaft 3 is retracted. 1b
And clamp it. Even after the starting force no longer acts on the motor, the turret is continuously clamped by preventing the return of the rotation of the second bevel gear by the self-locking action due to the twist angle of the worm / worm wheel.

If the worm and the worm wheel are not enough to maintain the clamp only by the self-locking action of the worm, the starting current is continuously supplied to the motors 9A and 9B within a range where the amount of heat generation does not increase, so that the starting forces are always in opposite directions. Can work as well. Also, the turret can be clamped by applying a brake to one of the two second bevel gears and activating the other second bevel gear drive motor for a set time. The speed reducer is not limited to a worm and a worm wheel.For example, any speed reducer having a self-locking function such as a spiroid gear for transmitting motion between staggered shafts may be used. it can. Further, a rotation detector for detecting the turning angle of the turret 4 may be attached to one or both output shafts of the motors 9A and 9B.

[0012]

Since the present invention is configured as described above, the following effects can be obtained. Two second bevel gears for turret rotation drive are provided, and the second bevel gears are rotated by separate drive motors via a worm / worm wheel speed reduction mechanism. The drive motors are started simultaneously in opposite directions for the timer set time, the turret rotation shaft is retracted, the turret end face is pressed against the end surface of the turret body, clamping is performed, and the self-locking due to the worm / worm wheel twist angle is performed. Since the clamping force is maintained by the action, the control means becomes one and the response is improved, the indexing of the turret and the clamping time can be shortened, and the structure is simplified and the cost is greatly reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tool post side surface of the present embodiment.

FIG. 2 is an AA line view of FIG.

FIG. 3 is a view taken along line BB of FIG. 1;

FIG. 4 is a sectional view of a conventional tool post side surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turret main body 3 Turret turning axis 4 Turret 5 First bevel gear 7A, 7B Second bevel gear 8A, 8B Worm wheel 9A, 9B Motor 11A, 11B Worm

Claims (1)

(57) [Claims] 1. A turret for turning indexing and clamping of a turret, wherein a first bevel gear is provided so that a thrust meshing with the turret turning shaft is in a turret retracting direction, and two first bevel gears meshing with the first bevel gear are provided. Two bevel gears are rotatably provided on the tool rest main body, and two drive motors having a drive side gear of a speed reducer having a self-locking action in which a passive side gear is concentrically fixed to the second bevel gear are connected to the tool rest. A timer is provided on the main body to set a time for simultaneously starting the two drive motors in the opposite directions. After the turret indexing, the drive motors are started in the opposite directions for a set time and the turret is retracted by the thrust of the first bevel gear. A tool post that performs clamping and maintains the clamping force by the self-locking action of the speed reducer.