JPH0260445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a turret with a double-rotation base for an automatic lathe, and more particularly to a turret with a double-rotation base for an NC lathe or the like so that cutters can be mounted in double rows. .

Conventional technology and problems Automatic lathes such as NC lathes usually have a compound rest that feeds in two axes on the bed.
The housing is attached thereto, and a turret having a rotary table for attaching a cutter is provided at the tip of the housing. However, conventional turrets generally have a rotary table with a single radial shape or a polygonal outer circumference to which several to 12 blades can be attached, a housing that holds the rotating transmission shaft, and a hydraulic motor that drives the gear mechanism. The blade index can be rotated through the .

As the conventional turrets mentioned above are becoming fully automated and unmanned through recent NC control, there is a growing demand for turrets that can be attached to more blades. However, in order to increase the number of installed cutters, it is often thought that the dimensions of the turntable should be increased, but this takes up space, makes designing the entire lathe difficult, and increases costs. Moreover, even if the above-mentioned problems are ignored, the problem of mutual interference between attached blades occurs, which increases the difficulty in speeding up indexing. On the other hand, a proposal has been made to increase the number of turrets by one more, but although the number of knives can be doubled, the problem of space occupancy and high cost still exists, and it cannot be said to be satisfactory in terms of practicality.

OBJECTS OF THE INVENTION The present invention has been proposed in view of the above, and its main purpose is to provide a turret that can be equipped with approximately twice as many blades as conventional ones.

The present invention aims to provide a turret that can reduce mutual interference between the blades even if the number of blades installed is doubled at the same time, and can be quickly indexed to the cutting position.

Structure of the Invention Based on the above, the means of the present invention provides a housing in the bed of an automatic lathe so that it can be fed in two axial directions by a two-part feeder, and a transmission gear mechanism is connected to the housing by a hydraulic motor. A turret for an automatic lathe, which is equipped with a rotary table for attaching a cutter so that the blade can be rotated through the turret and indexed to a predetermined value, and the rotary table is arranged so that the rotary table is in contact with the same axis in front and rear of each other so as to be able to rotate independently. In addition, the front rotary table can be shifted in the axial direction with respect to the rear rotary table and the housing, and each of the three coupling members has an uneven tooth surface formed on one side. is one piece of a three-piece coupling in which the concave and convex tooth surfaces are inscribed concentrically on the same plane, and the other piece engages and disengages by shifting the concave and convex tooth surfaces in opposition to this. Attach the other two plates that can be engaged and locked at the same time to the rear rotary table and the housing, and by shifting the front rotary table, both the front and rear rotary tables are engaged with the housing. It is characterized in that it can be stopped and released.

Effect: According to the means of the present invention having the above-mentioned features, two rotary tables are provided in a single housing so as to be able to rotate independently while coaxially contacting each other in the front and rear directions. It is possible to selectively drive and rotate one of the rotary tables using a conventional hydraulic motor, making it possible to form approximately the same number of blade mounting seats on each of the two rotary tables, and also to reduce the unevenness of the three-piece coupling. Two coupling members with their tooth surfaces facing the same side are attached to the rotating table and housing at the rear respectively, and another coupling member with its uneven tooth surfaces facing the opposite side to the two coupling members is attached in the axial direction. If it is attached to the shiftable front rotary table, the coupling member will also move with the shift of the rotary table, and will mesh with and disengage from the two coupling members, so when it is engaged, the rear It is fixed by being integrally engaged with the rotary table and housing, and by shifting in the opposite direction, the coupling of the coupling ring is released.
When they are separated from each other, both the front and rear rotary tables become rotatable relative to the housing, and either the front rotary table or the rear rotary table can be selectively rotated to index the blade.

Embodiments The present invention will be described below with reference to illustrations of embodiments. FIG. 1 is a vertical cross-sectional view schematically showing a turret with a double-row rotary table. In the figure, a housing 1 has a hollow cylindrical shape and is mounted on the bed of an NC lathe (not shown) on, for example, a two-part feed table that is movable in two axes relative to a workpiece. A first power transmission shaft 111 is pivotally supported in the housing 1 and extends vertically over almost the entire length.
A second power transmission shaft 121 is eccentrically supported parallel to this. A radial rotary table 11 having a radial arrangement of cutter seats as shown in FIG. A polygonal cylindrical rotary table 12 with a polygonal cutter seat arranged so as to be in contact with the rotary table 12 is rotatably fitted into a hollow cover 10 protruding from the front end surface of the housing 1 .
The polygonal rotary table has an internal tooth ring 12A at the rear end.
The rotation is transmitted by meshing with the pinion 12B at the tip of the second transmission shaft 121.

The first transmission shaft 111 and the second transmission shaft 121 are each rotationally driven by a hydraulic motor 21 provided at the rear of the housing 1 via a differential gear mechanism 22. The first large gear 1111 that transmits the power, and the second transmission shaft 1
Each of the second large gears 1112 driven by 21 is provided with a split cam 1111A as shown in FIG.
and 1112A are integrally provided, and each divided cam 1111
Although not shown in the figure, pawls 311 and 321, which are protruded from the hydraulic plunger valve and whose advance and retreat are controlled by hydraulic pressure, advance and bite into the cam notches P1 and P2 formed on the circumference of A and 1112A. By braking, the first power transmission shaft 111 and the second power transmission shaft 1
12 are positioned and stopped.

Next, the axial movement of the first transmission shaft 111 is hydraulically operated by a hydraulic operating mechanism 4 formed inside the hollow cover 10 at the front end of the housing 1.

In the configuration of the rotary table apparatus outlined above, the radial rotary table 11, the polygonal rotary table 12, and the housing 1 are engaged and fixed by a three-piece coupling 5 as shown in FIG. 2b. That is, in the figure,
A coupling member 51 has a ring shape and has a concave and convex tooth surface 511 formed facing forward on one side, and a concentrically inscribed coupling member 51 has a concave and convex tooth surface 53 on the forward side.
1 is formed on the coupling member 53, and the two coupling members 51, 53 are opposed from the front, and the uneven tooth surface 521 is formed on the opposing surface side.
11 and 531 at the same time, and the coupling member 52 is attached to the back surface of the radial rotary table 11, and the coupling members 51 and 53 are respectively is attached to the front end of the polygonal rotary table and the cover 10 of the housing 1, respectively, so that the tooth surfaces 511 and 531 face forward and face 521.

The operation of the above-mentioned embodiment of the present invention is as described below. Although detailed description is omitted, the hydraulic pressure is controlled by controlling a known hydraulic circuit system as schematically shown in FIG. It's starting to work.

In the figure, hydraulic oil is pumped from a hydraulic pump (not shown) and is sent to valves S ₁ , S ₂ , and S ₃ through pipes l ₁ , l ₂ , and l ₃ , respectively. The valve _S1 hydraulically operates the forward, reverse, and stop of the hydraulic motor 21 by solenoid control. The valves S ₂ and S ₃ are connected to the first transmission shaft 11, respectively.
Pawls 311, 321 of the first and second transmission shafts 121
The plunger valves 31 and 32 are moved forward and backward by selectively operating one of the solenoids based on a command from a computer.
The pawl 31 is activated by the backward operation of either 1 or 32.
1 or 321, it is possible to simultaneously open the hydraulic conduit for advancing the hydraulic actuating mechanism 4 of the first transmission shaft 111, and throttle the return oil conduit of the hydraulic motor 21.

When attempting to index a cutter using the above configuration of this embodiment, the hydraulic circuit system operates valve S ₁ and either valve S ₂ or S ₃ in response to a command from the computer. At _S1 , the hydraulic motor 21 is switched to rotate from the current position of the index cutter in either the forward or reverse rotation direction selected to require the minimum rotation angle. On the other hand, a valve S ₂ or S ₃ corresponding to either the radial rotary table 11 or the polygonal rotary table 12 to which a predetermined cutter determined depending on the cutting process is attached.
Either the plunger valve 31 or 3 is activated.
2 to move backward, thereby retracting either pawl 311 or 321, the corresponding transmission shaft 111 or 112 can rotate in a predetermined direction at an appropriate speed via differential gear mechanism 22. At the same time, the conduit for moving the hydraulic operating mechanism 4 of the first transmission shaft 11 forward is opened to pump hydraulic fluid. As a result, the transmission shaft 1
11 is moved forward, the coupling member 52 forming the three-piece coupling 5 disengages from the coupling members 51 and 53, thereby causing the radial rotary table 11 and the polygonal rotary table 12 to engage with the housing 1. The cutter is released from the cutter and becomes freely rotatable, and is rotationally driven by the hydraulic motor 21 to quickly rotate the predetermined rotary table 11 or 12 to index the cutter to the cutting position. After the specified blade has been indexed, the solenoid switches the valve _S1 according to a command from the computer, stops the hydraulic oil in the pipe _l1 , and stops the hydraulic motor 21, and at the same time, the above switching is performed. Valve S ₂ or S ₃ is switched back by actuation of the solenoid to advance plunger valve 31 or 32, thereby causing pawl 31 to move forward.
1 or 321 bites into the split cam 1111A or 1112A again, and at the same time, the plunger valve 31 or 32 communicates with the retracting conduit of the hydraulic actuation mechanism 4 of the first transmission shaft 11. As a result, the first power transmission shaft 11 moves back in the axial direction, and the radial rotary table 11 moves back to bring the coupling member 52 of the three-piece coupling 5 into meshing engagement with the coupling members 51 and 53. The polygonal rotating table 11 is engaged with and fixed to the housing.

Effects of the Invention According to the above embodiment of the present invention, the radial rotary table and the polygonal rotary table are coaxial so that almost twice as many cutters can be attached as compared to the cutter rotary table in a conventional NC lathe, without changing the turret size so much. The rotary table turrets, which are adjacent to each other on the center and are selectively and independently rotated by two separate transmission shafts by a hydraulic motor via a differential gear mechanism, making it possible to index the cutter, are connected to one of the two rotary tables. In addition to being able to move the entire transmission shaft in the axial direction, the axial movement can be achieved by engaging or disengaging the three-piece coupling, which allows it to be integrally fixed with the housing, or by detaching and fixing it when indexing. By releasing the rotary table so that each rotary table can be rotated individually, the blades are securely fixed in the housing together with the rotary table during each cutting operation, and at the same time, the other rotary table is also fixed and does not interfere with the work. When the process changes and the cutter is changed, the control operation for indexing the cutter is performed, that is, the pawl of the split cam is retracted and the rotary table is selected by the hydraulic motor via the differential gear mechanism. In conjunction with the rotating operation, the first transmission shaft is also moved by the hydraulic mechanism and can be released from the engagement with the housing, making it possible to quickly index the blade. Once the removal is complete, the turntable can be fixed to ensure that the cutter does not move during the work. Furthermore, the configuration for doing this is extremely simple and does not take up much space in the overall device.

Furthermore, the turret of the present invention is not limited to a chuck race like the conventional single turret, but can also be applied to a center race.

[Brief explanation of the drawing]

Fig. 1 shows a schematic cross-sectional view of an embodiment of the turret with a double-row rotary table in an NC lathe of the present invention, taken longitudinally along the housing axis, and Fig. 2 a, b, c
3 is a three-dimensional configuration diagram of the main parts of the same figure, including the radial rotary table, polygonal rotary table, split cam, and three-piece coupling, and FIG. 3 shows an example of the hydraulic circuit for operating the device of this embodiment. FIG. 1: Housing, 5: Coupling, 10: Hollow cover, 11, 12: Turntable, 31, 32: Plunger valve, 51, 52: Coupling member.

Claims (1)

[Scope of Claims] 1. A housing is provided in the bed of an automatic lathe so that it can be fed in two axial directions by a two-part feeder, etc., and a cutter is attached thereto and rotated by a hydraulic motor via a transmission gear mechanism. , a turret for an automatic lathe in which the housing is provided with a rotary table capable of performing a predetermined indexing operation of the cutter, and two rotary tables are provided so as to be able to rotate independently by arranging them in front and behind each other on the same axis and in contact with each other. The front rotary table can be shifted in the axial direction with respect to the rear rotary table and the housing, and each of the three coupling members has a concave and convex tooth surface on one side, and two of the coupling members have a concave and convex tooth surface on one side. are inscribed in concentric circles on the same plane, and the other is fitted with a three-piece coupling that can engage and disengage by shifting its concave and convex tooth surfaces in opposition to this, Two other pieces that can engage and lock at the same time are attached to the rear rotary table and the housing, respectively, and by shifting the front rotary table, the front and rear rotary table locks and releases from the housing. A turret with a double rotation table for an automatic lathe, characterized in that 2. According to claim 1, the rotary table is a radial rotary table with its cutter seats arranged in a radial manner at the front, and a polygonal cylindrical turntable whose cutter seats are arranged in a polygonal shape at the rear. Turret as described. 3. The polygonal cylindrical rotary table is rotatably fitted to the tip of the housing, and an internal toothed ring is provided at the rear end so that the polygonal cylindrical rotary table is rotated by transmission via a pinion. The turret according to item 2. 4 The above-mentioned three-piece coupling is attached to the front end of the polygonal cylindrical rotary table at the rear with one coupling member facing forward with its uneven tooth surface, and the other coupling member is attached with its uneven tooth surface facing forward in a concentric circle therewith. Another coupling member is attached to the front end of the housing so as to be inscribed in the shape of the housing, and the other coupling member is attached to the front radial rotary table with the concave and convex tooth surfaces facing backward so that the two concave and convex tooth surfaces can mesh simultaneously. A turret according to claim 2 comprising: