JPH03136745A - Indexing tool rest of machine tool - Google Patents

Abstract

PURPOSE:To perform indexing with high rigidity and at a high speed by making the coupling and fixed coupling of a turret clamp each other by a cam means after driving the turret by a servo motor output through a power transmission switching means. CONSTITUTION:When electric current flows in a coil 26, a disk is advanced, and a coupling 18 meshes with a shaft 29, and the rotation of an indexing motor 10 rotates a shaft 13, the coupling 18, shaft 29, gears 22 and 38, and cam follower 41 rolls in a cam groove 42, and a clamping member 43 is retracted, and facing head 2 becomes unclamped. When this states are detected, the current flowing in the coil 26 is cut-off, the disk 23 is retracted, coupling 18 meshes with a gear 15, and a shaft 13, the coupling 18, gear 15, 30, and 8, and an indexing shaft 3 are rapidly and smoothly driven by the output of the motor 10 according to the curve stored in an adjustable speed curve memory. When the facing head 2 is indexed, the coil 26 attracts the disk 23, and the motor 10 is rotated, clamping member 43 is slidden forward allowing the teeth of the clamping member 43 to mesh with teeth of a coupling 6 and fixed clamp to be clamped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an indexing tool rest for a machine tool such as a lathe. More specifically, the present invention relates to an indexing tool rest of a machine tool for indexing and rotating the indexing tool rest of the machine tool at high speed.

[Prior art] When using multiple tools in machining with a machine tool, turret I/
By using a tool stand and sequentially rotating and indexing it, various machining operations can be performed efficiently without having to change tools.9 For example, a turret tool stand on a lathe can be used for peripheral cutting, end face cutting, etc. Operations such as shaving, milling, boring, and thread cutting are performed efficiently by sequentially indexing tools. If the indexing speed of the turret tool stand is slow, the actual cutting time will become longer and production efficiency will deteriorate.

Known indexing and positioning mechanisms for turret tool stands include a curvic coupling mechanism and a method of positioning by inserting a dowel pin. For example, Utsukai Sho 62-9580
Publication No. 4 describes a method for indexing blades in machine tools, etc., which uses a drum-shaped globoidal cam as an intermittent indexing mechanism to intermittently rotate a plurality of cam followers that are radially attached to the circumferential surface of a shaft. The disc is listed.

Indexing and positioning of a conventional turret tool stand requires two operations: a rotating indexing operation and a clamping operation. After the turret tool stand is rotated and indexed to a desired position, the next operation is to fix the turret tool stand using means such as hydraulic pressure so that it does not move. In order to shorten the rotational indexing time of this slanted turret tool stand, the conventional method involves the above-mentioned two operations and has a limit.

The knife indexing machine described in the above-mentioned Japanese Utility Model Publication No. 62-95804 cannot obtain an accurate indexing angle unless both the shafts of the cam and the cam follower are positioned accurately relative to each other. Accurately controlling this indexing angle requires a complicated control device. Furthermore, since positioning accuracy is also required, there is a problem that the indexing speed cannot be increased. Therefore, the present applicant has proposed a turret tool stand and its indexing control device that can use the necessary turret surface simply by indexing without any clamping operation (Japanese Patent Application Laid-Open No. 64-87105, Japanese Patent Application Laid-Open No. 1-199
Publication No. 704).

[Problems to be Solved by the Invention] The turret tool stand proposed by the present applicant has made great progress in terms of high-speed indexing of the turret. However, since indexing is performed sequentially for each surface along the cam shape, unnecessary operations may be performed.

In other words, some tools may not be used depending on the processing.
Indexing time can be shortened by jumping to the tool surface to which the tool is attached and indexing the necessary tool. This invention was invented based on the above technical background, and achieves the following objects.

An object of the present invention is to provide an indexing tool rest for a machine tool that is capable of high-speed indexing and has high rigidity.

Another object of the present invention is to provide an indexing tool rest for a machine tool that is capable of high-speed indexing and jump indexing.

[Means for solving the above problems] In order to solve the above problems, the present invention takes the following measures.

A first means is an indexing tool rest of a machine tool in which a plurality of tools are fixed to a turret having a plurality of indexing surfaces, and a coupling provided on the turret and having meshing teeth formed at equal angles; a fixed coupling provided on a main body that supports the main body and having meshing teeth formed at equal angles; a clamping means for fixing both the couplings by meshing with the meshing teeth of the coupling and the fixed coupling; a cam means connected to the clamp means for driving it to an engaged/non-engaged position; a power transmission switching means for disconnecting and connecting power to the cam means or the indexing rotation of the turret; and this power transmission switching means. a servo motor for supplying rotational power to the turret; a turret drive transmission means for transmitting the power of the servo motor to index rotation of the turret when the power transmission switching means is in one operating state; and control means for controlling rotation of the motor.

In a second means, in an indexing tool rest of a machine tool in which a plurality of tools are fixed to a turret having a plurality of indexing surfaces, a coupling provided on the turret and having meshing teeth formed at equal angles; - a fixed coupling provided on a main body supporting the main body and having meshing teeth formed at equal angles, and a clamping means for fixing both the couplings by meshing with the meshing teeth of both the coupling and the fixed coupling; a cam means connected to the clamp means for driving the cam to an engaged/non-engaged position; a cam driving servo motor for driving the cam means; and an indexing servo motor for indexing and rotating the turret. ,
It is a control means for controlling rotation of the cam drive servo motor and the index servo motor.

It is more effective if the control means uses an acceleration/deceleration curve memory that stores the relationship between the driving speed of the servo motor and time.

"Function" The rotational output of the servo motor is transmitted to the power transmission switching means. One transmission path clamps f& transmitted from the power transmission switching means to the cam means, the clamping means, and the turret coupling and fixed coupling to each other. In the other transmission path, power from the power transmission switching means is transmitted from the turret driving means to the turret, and the turret is indexed and positioned at a desired position. The power transmission means is selectively controlled to either one, and clamp positioning and
Perform index positioning.

Alternatively, two servo motors may be used to control the indexing operation and the clamping and unclamping operations separately.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a developed cross-sectional view showing an embodiment of an indexing tool rest 1 for a machine tool. The face plate 2 is in the shape of a disk or a polygon. A tool T is placed at equiangular positions on the outer circumference of the disk 2.
is the installation.

One end of an indexing shaft 3 is fixed to the center of the face plate 2 with a bolt. The front and rear of the indexing shaft 3 are supported within the main body 5 by bearings 4.4.

An annular coupling 6 is fixed to the side surface of the face plate 2. An annular fixed coupling 7 is fixed to the main body 5 on the inner periphery of the coupling 6. A drive gear 8 is fixed to the rear end of the indexing shaft 3 with a key and a nut 9.

The servo motor 0 drives the indexing of the face plate 2 and the clamping of a coupling, a fixed coupling 7, and an annular clamp member to be described later.

An output shaft 11 of the servo motor O is connected to a drive shaft 13 via a coupling 12. A spline 14 is formed on the outer periphery of the tip of the drive shaft 13.

A gear 15 is rotatably supported on the outer periphery of the drive shaft 13 by a bearing 16 . Clutch teeth 17 are formed on the side surface of the gear 15. A movable coupling 18 is slidably provided on the outer periphery of the spline 14 by spline connection. On the front and rear end surfaces of the moving coupling 18,
Clutch teeth 19,20 are formed. clutch teeth 20
Clutch teeth 21 are formed on the drive shaft 29 at positions opposite to the drive shaft 29 so as to mesh with the clutch teeth 20. The drive shaft 29 is rotatably supported by the main body 5 with a bearing 25. A gear 22 is formed at the front end of the drive shaft 29 .

A movable disk 23 is rotatably supported on the outer periphery of the movable coupling 18 by a bearing 24 .

On the side surface of the moving disk 23 and on the main body 5, an electromagnetic coil 2 is installed.
6 is a provision. On the main body 5 on the side of the electromagnetic coil 26,
A push pin 27 is provided so as to be freely movable in the front and rear directions. A coil spring 28 is interposed between the push pin 27 and the main body 5. The push pin 27 constantly pushes the movable disk 23 in the rear direction.

Gear 15 meshes with pinion gear 30. The pinion gear 30 is rotatably supported by a bearing 49. The pinion gear 30 also meshes with the drive gear 8 at the same time. An annular member 35 is provided on the outer periphery of the main body 5 so as to be slidable back and forth. An annular groove 36 is formed on the outer peripheral surface of the annular member 35 . The annular groove 36 has no angle in the index axis direction. A coil spring 37 is interposed between the annular member 35 and the main body 5, and constantly pushes the annular member 35 forward.

An annular gear 38 is rotatably provided on the annular 7I436 via a bearing 39. A plurality of cam followers 41 are connected to the side surface of the annular gear 38 via a connecting member 40 . The force 11 follower 41 is inserted into the annular cam groove 42. The annular cam groove 42 is connected to the annular clamp member 43.
(Fig. 2). Annular clamp member 4
Coupling teeth 44 are formed on the front end surface of 3.

The annular clamping member 43 connects the fixed coupling 7 with the key 4.
5 so that it can be moved back and forth.

The coupling teeth 44 mesh with teeth formed on the coupling 6 and the fixed coupling 7, and are clamped so that the annular clamp member 43, the coupling 6, and the fixed coupling 7 cannot move together. That is, the face plate 2 is indexed and positioned and clamped to the main body 5.

Figure 3 is a functional block diagram of a control device for controlling the servo motor. The CPU 50 is a central processing circuit and controls the entire control device. CPU50 has
Various 110 devices are connected via a bus 51. The acceleration/deceleration curve memory 52 is a ROM memory that stores and holds a rotation control program for the servo motor IO. In order to rotate the servo motor 10 at an extremely high speed and achieve smooth driving, it is desirable that the rate of change in speed during acceleration and deceleration of the rotational drive, that is, the acceleration, has as little variation as possible. The acceleration/deceleration curve memory 52 is an acceleration/deceleration control program regarding the speed and time of the servo motor 10.

The CRT 53 is a display device equipped with a keyboard for displaying and inputting data. The knife program memory 54 stores and holds a turret movement command, a feed rate, a turret indexing command, and the like.

The tool post servo motor control circuit 55 controls the servo motor 10
This is a circuit for driving. That is, it is a circuit that controls the speed of the servo motor 10 by receiving start, stop, and acceleration commands in the order stored in the acceleration/deceleration curve memory 52 based on commands from the CPU 50.

The output of the tool post servo motor control circuit 55 is output from the amplifier 56.
The signal is input to the servo motor 10 via the servo motor 10. A tacho generator 57 and a pulse generator 58 are connected to the output shaft of the servo motor 57. tacho generator 57
, the outputs of the pulse generators 58 are outputted to the amplifiers 5 and 58, respectively.
6. The rotational position and rotational speed are controlled by being fed back to the tool post servo motor control circuit 55. The pulse generator 58 generates a pulse wave according to the rotational speed, and the tacho generator 57 is a type of generator that generates voltage.The structure and functions thereof are well known and will not be described here.

The electromagnetic coil 26 is for switching the power transmission path when transmitting the drive of the servo motor IO to the indexing shaft 3 or the drive shaft 29 as described above. The electromagnetic coil 26 is driven by a command from the CPU 50 via an interface 59.

-1 FIG. 4 is a flowchart showing an overview of the operation of the above-mentioned indexing tool rest. When there is an indexing command on the turret (step P
, ), the CPU 50 issues a command to cause current to flow through the electromagnetic coil 26. As a result, the moving disk 23 is attracted to the electromagnetic coil 26, compresses the coil spring 28, and moves forward.

The clutch teeth 20 of the movable coupling 18 and the clutch teeth 21 of the drive shaft 29 mesh (P2). Furthermore, cpu
50 issues a drive command to the indexing motor 10 via the turret servo motor control circuit 55 (P3).

The servo motor 10 is activated and rapidly starts rotating. The output shaft 11 of the servo motor 10 rotationally drives a drive shaft 29 via a coupling 12 , a drive shaft 13 , a moving coupling 18 , clutch teeth 20 , and clutch teeth 21 . When the two drive shafts are rotated, the pinion 2
2 rotates, and the annular gear 38 is rotationally driven.

Since the annular gear 38 is rotatably supported on the outer periphery of the annular member 35, it rotates as it is. When the annular gear 38 rotates, the cam follower 41 rolls within the annular cam groove 42 . Since the annular cam groove 42 is formed in a wave shape with a constant pitch, the annular clamp member 4 is moved by the cam follower 41.
3 moves backward on the fixed coupling 7.

Due to this backward movement, the meshing teeth of the coupling 6 and the fixed coupling 7 and the coupling 144 of the annular clamp member 43 are disengaged. The face plate 2 is unclamped and is in a state where it can automatically rotate (P4). This state is detected by a limit switch (not shown), and upon receiving this detection signal, the next operation is started.

When this state is reached (P4>), the current flowing through the electromagnetic coil 26 is cut off, and the moving disk 23 is moved by the coil spring 2.
8 to retreat. Therefore, the clutch teeth 19 of the moving coupling 18 mesh with the clutch teeth 17 of the gear 15 (P,). The output shaft 11 of the servo motor 10 includes a coupling 12, a drive shaft 13, a spline 14, a moving coupling 18, a clutch tooth 20, a clutch tooth 17, and a gear 1.
5, the pinion gear 30, the drive gear 8, and the index shaft 3 are rotationally driven in this order. The rotational drive at this time is performed rapidly and smoothly according to the curve stored in the acceleration/deceleration curve memory 52 (P6).

The face plate 2 is indexed and positioned at the desired index position (P
7) and the electromagnetic coil 26 attracts the moving disk 23.

One clutch tooth meshes with clutch tooth 21 (P8
). When the CPU 50 issues a rotation drive command to the servo motor 10 again, the servo motor 10 starts rotating (P
,). Similarly to the above operation, when the gear 22 and the annular gear 38 are rotationally driven, the cam follower 41 slides within the annular cam groove 42 and causes the annular clamp member 43 to slide forward. The coupling teeth 44 of the annular clamp member 43 mesh with both the meshing teeth of the coupling 6 and the fixed clamp 7, clamping these three members together in phase, and also stopping the rotation of the servo motor 10.

The annular member 35 is further pushed forward by the coil spring 37 and is firmly clamped (P+o).

The indexing turret completes its operation and waits for the next indexing command (P + t).

[Second Embodiment 1 The above embodiment uses -1 servo motors 1o,
The clamping operation and indexing operation of the face plate 2 are switched and controlled by a clutch. The cross-sectional developed view shown in Figure 5 is 2
This is an example using two servo motors. Servo motor 6
0 is a motor for clamping and unclamping. The servo motor 61 is a servo motor for indexing the face plate 2. The servo motor 60 for clamping and unclamping is controlled by a servo motor control circuit 62. The indexing servo motor 61 is controlled by a servo motor control circuit 62. The timing of driving both motors is controlled in the same way as in the previous embodiment.

[Effects of the Invention] As described in detail above, the present invention achieves high-speed indexing while also performing positioning clamping using a coupling, thereby realizing a highly accurate and highly rigid tool post.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the first embodiment of the indexing tool rest for a machine tool, Fig. 2 is a partial view showing the shape of the cam groove, Fig. 3 is a functional block diagram of the control device, and Fig. 4 is the first embodiment of the indexing tool post for a machine tool. A flowchart showing the operation of the embodiment, FIG. 5 is a diagram showing the second embodiment. ■... Machine tool indexing turret, 2... Face plate, 3...
・Index shaft, 4... Bearing, 5... Main body, 6... Coupling, 7... Fixed coupling, 10... Servo motor, 18... Moving coupling, 23... - Moving disk, 26... Electromagnetic coil, 36... Annular groove, 3
8... Annular gear, 41... Cam follower, 42...
・Annular cam groove, 43...Annular clamp member, 44...
・Coupling tooth 2nd figure 3rd figure n

Claims (1)

[Scope of Claims] 1. In an indexing tool rest of a machine tool in which a plurality of tools are fixed to a turret having a plurality of indexing surfaces, a coupling provided on the turret and having meshing teeth formed at equal angles; a fixed coupling provided on a main body supporting the turret and having meshing teeth formed at equal angles; and a clamping means for fixing both the couplings by meshing with the meshing teeth of both the coupling and the fixed coupling. , a cam means connected to the clamp means for driving it to the engaged/disengaged position, a power transmission switching means for disconnecting and connecting the power to the cam means or the indexing rotation of the turret, and this power transmission. a servo motor for supplying rotational power to the switching means; a turret drive transmission means for transmitting the power of the servo motor to index rotation of the turret when the power transmission switching means is in one operating state; An indexing tool rest for a machine tool, comprising: a control means for controlling rotation of the servo motor. 2. In an indexing tool rest for a machine tool in which a plurality of tools are fixed to a turret having a plurality of indexing surfaces, a coupling provided on the turret and having meshing teeth formed at equal angles, and a main body supporting the turret. a fixed coupling provided on the holder and having meshing teeth formed at equal angles; a clamping means for fixing the couplings by meshing with the meshing teeth of the coupling and the fixed coupling; and a clamping means connected to the clamping means. a cam means for driving the turret to an engaged/non-engaged position; a cam driving servo motor for driving the cam means; an indexing servo motor for indexing and rotating the turret; An indexing tool rest for a machine tool, comprising a servo motor and a control means for controlling rotation of the indexing servo motor. 3. The indexing tool rest for a machine tool according to claim 1 or 2, wherein the control means includes an acceleration/deceleration curve memory for controlling the relationship between the driving speed of the servo motor and time.