JPS62236607A - Turret with double carriage in automatic lathe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 so that cutters can be mounted in double rows in an NC lathe or the like. .

Conventional Technology and Problems Automatic lathes such as NC lathes usually have a housing attached to a compound rest that feeds biaxially on a bed, and a cutting tool is attached to the tip of the compound rest. It is equipped with a turret equipped with a rotating platform. However, conventional turrets generally have a rotary table with a single radial shape or a polygonal outer periphery to which several to 12 blades can be attached, and a housing holds a rotary transmission shaft and is driven by a hydraulic motor. The blade is indexed and rotated via a gear mechanism.

As the above-mentioned conventional turrets are becoming fully automated and unmanned through recent NC control, there is an increasing 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. Also,
Even if the above-mentioned problems are overcome, the problem of mutual interference between the attached blades occurs, which increases the difficulty in speeding up indexing. On the other hand, a proposal was made to add one more turret, but although it would be possible to double the number of blades, 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 when the number of blades installed is doubled, and can quickly index to the cutting position.

Structure of the Invention Based on the above, the means of the present invention provides a bed of an automatic lathe,
A housing is provided so that the blade can be fed in two axial directions by a two-part feeder, etc., and a rotary table for attaching the cutter is installed on this housing so that it can be rotated by a hydraulic motor via a transmission gear mechanism, and the cutter can be indexed in a predetermined manner. The turret for an automatic lathe is provided with two rotary tables that are arranged so as to be able to rotate independently, with the rotary tables being arranged so that they touch the same axis in the front and back, and the front rotary table is axially oriented with respect to the rear rotary table and the housing. It is composed of three coupling members each having a concave and convex tooth surface formed on one side, and two of the coupling members have concave and convex tooth surfaces inscribed concentrically on the same plane, and the other This is a three-piece coupling in which the uneven tooth surfaces shift in opposition to each other so that they engage and disengage, and this one piece can be engaged and locked at the same time. The front and rear rotary bases are locked and released from the housing by shifting the front rotary base. It is characterized by

According to the means of the present invention having the above-mentioned characteristics, two rotary tables are provided in a single housing so as to be able to coaxially contact each other in the front and back so as to be able to rotate independently. Through this, 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 cutter mounting seats on each of the two rotary tables, and also to form a three-piece cup. Two coupling members with the concave and convex tooth surfaces of the rings facing the same side are attached to the rear rotary table and the housing, respectively, and another coupling in which the concave and convex tooth surfaces of the rings face the side opposite to the two coupling members. If the member is attached to the front rotary table which can be shifted in the axial direction, the coupling member will also move with the shift of the rotary table and engage and disengage from the two coupling members, so that the coupling member can be engaged with and disengaged from the two coupling members. When fitted, the rear rotary table and housing are integrally engaged 1. If you shift in the opposite direction, the coupling will be disengaged and disengaged from each other, allowing both the front and rear rotary tables to rotate relative to the housing. Either of the mounts can be selectively rotated to allow indexing of the blade.

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

The internal tooth ring 12A at the rear end of the polygonal rotary table is attached to the second
Rotation is transmitted by meshing with the pinion 12B at the tip of the transmission shaft 121.

The first transmission shaft 111 and the second transmission shaft 121 are operated by a hydraulic motor 21 provided at the rear of the housing 1.
A first canine gear 1111 that is rotationally driven via the differential gear mechanism 22 and transmits power to the first transmission shaft 111.
and the second large gear 111 driven by the second transmission shaft 121.
2 each has a split cam 111 as shown in FIG. 2C.
1A and 1112A are provided integrally, and each split cam 1111A
and cam notches P1 and P2 formed on the circumference of 1112A,
Although not shown in the figure, pawls (311, 321) are installed protruding from the hydraulic plunger valve and whose advance and retreat are controlled by hydraulic pressure.
By advancing and biting and braking, the first power transmission shaft 111 and the second power transmission shaft 112 are respectively positioned and stopped.

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

In the structure 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. 2C. That is, in the figure, there is a coupling member 51 which is ring-shaped and has a concave-convex tooth surface 511 formed facing forward on one side, and a coupling member 51 which is inscribed concentrically with the coupling member 51 and has a concave-convex tooth surface 531 formed on the forward side of the same IK. A coupling member 53 which faces the two coupling members 51 and 53 from the front side and has a concave and convex tooth surface 521 formed on the opposing surface side so as to contact and mesh with both of the convex and convex tooth surfaces 511 and 561 at the same time. The coupling member 52 is attached to the back surface of the radial turntable 11, and the coupling members 51 and 53 have tooth surfaces 511 and 531 facing forward and facing 521. The front end portion of the polygonal rotary table and the cover 10 of the housing 1 are respectively attached to the polygonal rotating table.

The operation of the above-mentioned embodiment of the present invention will be explained as follows. Although detailed description will be omitted, the operation is performed by controlling a known hydraulic circuit system as schematically shown in FIG. Oil is pipe 1-1t t2
, t3, respectively, to the valve Str82+Ss. Valve sl is operated by hydraulic motor 2 by solenoid control.
1. Forward, reverse, and stop are hydraulically operated. and valve 321
S3 are the first power transmission shaft 111 and the second power transmission shaft 12, respectively.
The pusher valves 31 and 32, each of which has protruding pawls 311 and 321, can be moved forward and backward by selectively operating one of the solenoids based on computer instructions. pawl 31
1 or 621, at the same time the first transmission shaft 1
It is possible to open the hydraulic conduit for advancing the hydraulic actuating mechanism 4 of 11, and to adjust the return oil conduit of the hydraulic motor 21.

When indexing a cutter with the above configuration of the present embodiment, the hydraulic circuit system receives a command from the computer and operates the valve Sl and one of the valves S2 and S3, and the valve Sl is operated by the hydraulic motor 21. is switched to rotate from the current position of the indexing cutter in either the forward or reverse rotation direction selected so that the minimum rotation angle is required. On the other hand, a radial rotary table 11 is attached with a predetermined cutter determined by the cutting process.
Or valve S2 corresponding to either polygonal rotary table 12
or 83, depending on the operation of either plunger valve 31 or 3.
2 to move backward, thereby retracting either the pawl 311 or 321, and the corresponding transmission shaft 111 or 112 rotates in a predetermined direction at an appropriate speed via the 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. For this,
Since the transmission shaft 111 is moved forward, the coupling member 52 forming the three-piece coupling 5 is moved forward by the coupling member 51.
．． By releasing the mesh with 53, the radial rotating table 11
The polygonal rotary table 12 is released from the engagement with the housing 1 and can rotate freely, and is rotationally driven by the hydraulic motor 21, so that the predetermined rotary table 11 or 12 quickly rotates, and the cutter is placed in the cutting position. I will put it out. After the predetermined blade is indexed, the solenoid switches the valve Sl according to a command from the computer, stops the hydraulic oil in the pipe t1, and stops the hydraulic motor 21, and at the same time switches the valve S2 or S3 which was switched above. is switched and restored by the operation of the solenoid so that the plunger valve 31 or 32 advances, so that the pawl 311 or 321 bites into the split cam 1111A or 1112A again, and at the same time the plunger valve 31 or 32 moves forward. 1st
The hydraulic actuating mechanism 4 of the transmission shaft 11 is brought into communication with the conduit through which it moves backward. As a result, the first power transmission shaft 11 retreats in the axial direction, and the radial rotary table 11 retreats to move the coupling member 52 of the three-piece coupling 5 to the coupling member 5.
1.53, and the radial rotary table 11 and the polygonal rotary table are both fitted and fixed to the housing.

Invention Zero Effect According to the above embodiment of the present invention, the radial rotary table and the polygonal rotary table are used so that the turret dimensions do not change much and a number of blades can be attached to the cutter rotary table which is twice as many as the cutter rotary table in a conventional NC lathe. A rotary table turret, which is adjacent to each other on the same axis and is 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, is installed on one side of both rotary tables. The transmission shaft can be moved in the axial direction together with the transmission shaft, and its axial movement can be fixed by integrally connecting with the housing by engaging or disengaging the three-piece coupling, or detaching it when indexing. By separating both rotary tables and allowing them to rotate independently, the blade and rotary table are fixed in a fixed position in the housing during each cutting operation, and at the same time, the other rotary table is also fixed. When the process changes and the cutter is changed, the control operation for indexing the cutter, that is, retracting the pawl of the split cam and using the hydraulic motor to operate the differential gear mechanism, is performed. In conjunction with the operation of selectively rotating the turntable through the
The first transmission shaft is also moved by a hydraulically actuated mechanism and can be released from its engagement with the housing, making it possible to quickly index the blade, and once indexing is completed, it can be used reliably during machining. The rotary table can be fixed to prevent the blade from moving. Furthermore, the configuration for doing this is extremely simple and does not take up much space in the overall device.

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

[Brief explanation of drawings]

Fig. 1 shows a schematic diagram of an embodiment of a turret with a double-row rotary table for an NC lathe according to the present invention, taken longitudinally along the housing axis, and Fig. 2 a, b, and c are radial views of the main parts of the same figure. FIG. 3 is a schematic diagram showing an example of a hydraulic circuit for operating the device of this embodiment. 1: Housing 5: Coupling 10: Hollow cup (- 11, 12: Turntable 31. 32 Nib run gear valve sl, 52: Coupling member Fig. 3

Claims (4)

[Claims] (1) Two parts are placed on the bed of an automatic lathe using a two-part feed stand, etc.
In an automatic lathe, the housing is provided with a housing so as to be fed in the axial direction, and a rotary table is provided in the housing, to which a cutter is attached and rotated by a hydraulic motor via a transmission gear mechanism, and capable of performing a predetermined indexing operation of the cutter. The turret is provided with two rotary tables arranged in front and back of each other along the same axis so that they can rotate independently, and the front rotary table is shiftable in the axial direction with respect to the rear rotary table and the housing, Each of the three coupling members has a concave and convex tooth surface formed on one side, two of which have concave and convex tooth surfaces inscribed in concentric circles on the same plane, and the other one has a concave and convex tooth surface that is inscribed in a concentric circle on the same plane. One of the three-piece couplings, which can be engaged and disengaged by shifting in opposition to the two, is installed, and the other two couplings, which can be engaged and locked at the same time, are connected to the rotating table at the rear. A turret with a double rotary table for an automatic lathe, characterized in that the front and rear rotary tables are respectively attached to a housing and are locked to and released from the housing by shifting the front rotary table. (2) Claim 1, wherein 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. The turret described in section. (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. A turret according to scope 2. (4) In the above-mentioned three-piece coupling, one coupling member is attached to the front end of the polygonal cylindrical rotary table at the rear with its uneven tooth surface facing forward, and the other coupling member is attached with its uneven tooth surface facing forward. Another coupling member is attached to the front end of the housing so as to be inscribed concentrically therewith, and has its concave and convex tooth surfaces facing backward so that it can simultaneously engage with the radial rotary table in the front. The turret according to claim 2, wherein the turret is attached.