JPH0729259B2 - Indexing turret for machine tools - Google Patents

Description

TECHNICAL FIELD The present invention relates to an indexing tool post of a machine tool such as a lathe. More specifically, it relates to an indexing tool post of a machine tool for indexing and rotating an indexing tool post of a machine tool at high speed.

[Prior Art] When multiple tools are used for machining a machine tool, the turret tool post is used, and the turret with the tools attached is sequentially rotated to index the tool attachment surface, without changing the tools one by one. Various processing operations are performed efficiently. For example, in the case of a turret turret of a lathe, work such as peripheral cutting, end face cutting, drilling, boring, and thread cutting is performed efficiently by sequentially indexing tools. However, when the indexing speed of the turret tool post is slow, the actual cutting time becomes long and the production capacity deteriorates.

As the indexing and positioning mechanism of the turret tool post, a curvic coupling mechanism, a method of inserting and positioning a knock pin, etc. are known. For example, in Japanese Utility Model Laid-Open No. 62-95804, a globoidal cam having an hourglass shape is used as an intermittent indexing mechanism to intermittently rotate a plurality of cam followers radially attached to the circumferential surface of a shaft. A blade indexing machine for machine tools and the like is described.

Conventional indexing positioning of a turret tool post requires three operations, an indexing operation for rotating the turret, an unclamping operation, and a clamping operation. That is, in order to make the turret rotatable with respect to the turret tool post, unclamp it, rotate the turret of the turret tool post to index to the desired position, and then keep the turret from moving with respect to the turret tool post. It is fixed by a clamping means using hydraulic pressure or the like.

For this reason, in order to shorten the rotation indexing time of the turret tool post, the conventional one has a limit in speeding up including the above-mentioned three operations. In the blade indexing machine described in Japanese Utility Model Laid-Open No. 62-95804, the indexing angle cannot be accurately calculated unless the cam and the cam follower shafts are relatively accurately positioned. The control device is complicated to accurately control the indexing angle. Further, since positioning accuracy is required, there is a problem that the indexing speed cannot be increased.

Therefore, the applicant of the present invention has proposed a turret tool base and an indexing control device for the turret tool base, which can index the necessary turret surface without clamping and unclamping by simply indexing (Japanese Patent Application Laid-Open No. 64-64)
-87105, JP-A-1-199704).

[Problems to be Solved by the Invention] The turret tool post proposed by the present applicant has been dramatically improved in terms of high-speed indexing of the turret. However, since the indexing operation is sequentially performed for each surface along the cam shape,
In the case of indexing multiple surfaces, useless operations may be performed. That is, since there is a tool that is not used depending on the machining, it is possible to shorten the indexing time by jumping the turret surface of the tool to which the tool is attached and indexing the necessary turret surface of the tool.

And while the turret tool post described above enabled high-speed indexing, there is no impact even under bad conditions such as when the tool is laid out unbalanced on the turret, and during accelerating and deceleration so that accurate indexing operation is performed. A constant is set. Therefore, it is not an appropriate acceleration / deceleration time constant corresponding to the state of the tool layout. The indexing time may be further shortened by performing high-speed indexing with a steeper acceleration / deceleration curve when the tool layout has good conditions without imbalance.

Further, the above-mentioned one does not clamp the turret to which the tool is attached to the turret tool rest, so that the rigidity is slightly low. The present invention was invented under the technical background as described above, and achieves the following objects.

An object of the present invention is to provide an indexing tool rest for a machine tool which can perform a high-speed indexing operation and has high rigidity.

Another object of the present invention is to provide an indexing tool post of a machine tool which can perform a high speed indexing operation and a jump indexing operation.

Further, another object of the present invention is to set an acceleration / deceleration time constant to an optimum value in accordance with a layout state in which a tool is attached to a turret, so that an indexing tool post of a machine tool capable of indexing at a higher speed can be obtained. To provide.

[Means and Actions for Solving the Problems] The following means are adopted to solve the problems.

This invention has a plurality of tool mounting surfaces, and a turret (2,60) having a tool fixed to each tool mounting surface, and a positioning means (43,44) for positioning the turret (2,60) at a predetermined angular position. And a first coupling tooth (8) formed on the turret (2, 60) in an annular shape at an equal angular pitch, and a main body (4) that rotatably supports the turret (2, 60) A fixed coupling tooth (14) formed in an annular shape at equal angular pitches, and a second coupling tooth (13) that simultaneously meshes with the first coupling tooth (8) and the fixed coupling tooth (14)
And an annular clamp member (11) for fixing the turret (2,60) to the main body (4), and the annular clamp member (11) on the turret (2,60) only in the axial direction. Coupling means to allow relative movement to (1
2), an annular cam groove (16) provided in the annular clamp member (11) in the circumferential direction, and a cam follower (25) contacting the annular cam groove (16) are fixed, and a drive shaft ( 21) a cam follower main body (23) movably provided only in the axial direction, a biasing means (27) for biasing the cam follower main body (23) in the axial direction, and a gear to the drive shaft (21). A servo motor (50) for rotationally driving and stopping rotation via a first clutch tooth (26) annularly formed on the cam follower body (23), and annularly formed on the annular clamp member (11). And a second clutch for engaging the first clutch tooth (26) and indexing and driving the annular clamp member (11) through the drive shaft (21).
A clutch tooth (17) and an annular third clutch tooth (33) that meshes with the first clutch tooth (26) are formed, and are rotatably provided on the drive shaft (21) and the annular clamp member (11). ) Annular clutch (30) provided movably only in the axial direction
And an annular clutch drive means (47, 35) for sending the annular clutch (30) in the axial direction to disengage the third clutch tooth (33) and the first clutch tooth (26). It is an indexing tool post of a machine tool characterized by having.

The index tool post of the machine tool is controlled by the following control device. That is, the RAM (81) for setting the acceleration / deceleration time constant when driving the servo motor (50) that turns the turret (2, 60), and the maximum load when turning the servo motor (50). Turret turning load detection means (88) for detecting and storing the value
And the servo motor (5 when turning the turret (2,60)
0) The load-acceleration / deceleration correspondence table file (79) storing the acceleration / deceleration time constant set value for the load value and the maximum load value detected by the turret turning load detection means (88), Deceleration correspondence table file (7
By means of 9), the optimum value of the acceleration / deceleration time constant of the servomotor (50) is specified, and the swing acceleration / deceleration time constant setting means (78) for rewriting the acceleration / deceleration time constant in the RAM (81), It has a file and a central processing unit (71) that controls each of the means, and controls the servo motor (50) with an optimum acceleration / deceleration time constant corresponding to the mounting state of the tool on the turret (2, 60). It is a control device characterized by controlling.

First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional development view showing an embodiment of an indexing tool post 1 of a machine tool. FIG. 2 is a development view of coupling teeth and clutch teeth, which will be described later. The face plate 2 has a disc shape or a polygonal shape. A turret cylinder 60 is fitted in the inner diameter portion of the face plate 2 and integrally forms a turret 61 of the indexing tool post 1. Further, a tool T is attached to the outer periphery of the disc 2 at equiangular positions.

At the center of the face plate 2, a shaft body 3 is provided integrally with the main body 4. The face plate 2 is rotatably supported by the shaft body 3 by bearings 5. The inner ring of the bearing 5 is rotatably supported by the shaft body 3 via a spacer 6. A cylindrical turret cylindrical body 60 is provided integrally with the face plate 2 on the main body 4 side. A cylindrical space 7 is formed at the center of the turret cylinder 60. On the other hand, the turret cylinder 60 has an annular clamp member 11
Are connected to the turret cylinder 60 by a key 12.

Therefore, the annular clamp member 11 can move relative to the turret cylindrical body 60. Coupling teeth 13 are formed on the rear (main body 4 side) side surface of the environmental clamp member 11. Further, fixed coupling teeth 14 are formed on the front side of the main body 4 (on the right side in FIG. 1) at a position where they mesh with the coupling teeth 13. The coupling tooth 13 meshes with the coupling tooth 8 and the fixed coupling tooth 14 formed on the inner peripheral side surface of the turret cylindrical body 60, and clamps the annular clamp member 11, the main body 4, and the turret 61 so that they cannot move integrally. .

That is, when the coupling teeth 8 and 13 and the fixed coupling teeth 14 are meshed with each other, the turret 61 is angularly positioned in the main body 4 at a predetermined indexing position. An inner hole 15 is formed on the inner circumference of the annular clamp member 11. An annular cam groove 16 which is a continuous groove is formed on the inner circumference of the annular clamp member 11. Inner hole 15 of annular clamp member 11
Clutch teeth 17 are formed on the front side surface facing the front. The clutch teeth 17 are teeth for transmitting rotation at a constant pitch interval.

On the other hand, on the outer circumference of the shaft body 3, the drive shaft 21
Is rotatably supported. At the rear end of the drive shaft 21,
A gear 22 is formed. A cam follower body 23 is provided on the outer periphery of the drive shaft 21 so as to be movable in the axial direction via a key 24. A plurality of cam follower rollers 25 are radially provided on the outer periphery of the cam follower main body 23. The roller 25 is inserted into the annular cam groove 16 and rolls in the annular cam groove 16.

Clutch teeth 26 are formed on the rear side surface of the cam follower body 23 at regular pitch intervals. The rear side surface of the flat spring 27 is in contact with the front side surface of the cam follower body 23.
The front side surface of the flat spring 27 is fixed to an annular spacer 6 fixed to one end of the drive shaft 21. Eventually, the flat spring 27 presses the annular clamp member 11 against the turret 61 via the cam follower main body 23, that is, the cam follower main body 23 via the roller 25.

Therefore, the coupling teeth 13 and the coupling teeth 8 mesh with each other. At the same time, the coupling teeth 13 of the annular clamping member 11
Are pressed against the fixed coupling teeth 14. Therefore, the turret 61 is finally clamped to the main body 4.

An annular clutch is provided on the outer periphery on the rear side of the cam follower body 23.
30 is rotatably provided. But the annular clutch
Since the outer periphery of 30 is connected by the annular clamp member 11 and the key 31, it rotates integrally with the annular clamp member 11, but is slidable in the axial direction.

Clutch teeth 33 are formed on the front end of the annular clutch 30 at regular intervals. A joint 34 is connected to the rear end of the annular clutch 30. As shown in the drawing, the joint 34 is an annular joint that is U-shaped in cross-section and is connected to each other. The joint 34 transmits movement of the shaft 3 in the axial direction to the annular clutch 30, but does not transmit rotation. One end of a push rod 35 is fixed to the side surface of the joint 34. The push rod 35 is provided movably in the main body 4 in a direction parallel to the axis of the shaft body 3. One end of a link 36 is fixed to the rear end surface of the push rod 35. At the intermediate position of the link 36, the pressing portion 37
Are provided integrally.

An adjusting bolt 38 for adjusting the length is fixed to the rear end of the pressing portion 37, and the length is adjusted as necessary. A lever 39 is rotatably provided on the pressing portion 37 by a shaft 40.
An intermediate portion of the lever 39 is swingably provided on the main body 4 by a shaft 41. The other end of the lever 39 is rotatably connected to the rear end of the locator 43 via a shaft 42. Locator 43
Is moved back and forth when the lever 39 swings around the shaft 41. An insert portion 44 is formed at the tip of the locator 43.

The turret cylindrical body 60 is provided with indexing positioning holes 9 corresponding to the insertion portion 44 in units of angle of the tool T. A spring 45 is arranged between the main body 4 and the locator 43. The insertion portion 44 of the locator 43 is pushed by the spring 45 so as to be inserted into the indexing positioning hole 9. Whether the locator 43 is inserted or not inserted is detected by the proximity switches 46, 46. The body 4 has a solenoid 4
7 are provided. The solenoid 47 has a pusher 48
Are arranged.

The pusher 48 is driven when a current is input to the solenoid 47 and pushes the adjustment bolt 38. A servo motor 50 is arranged at the rear of the body 4. An encoder (not shown) is provided at the rear of the servomotor 50 to detect the indexing position of the turret 61. Servomotor
A pinion 52 is fixed to the output shaft 51 of the 50. The pinion 52 meshes with the gear 53. Gear 53 is a connecting shaft
It is integrated with the gear 55 through 54, and both rotate simultaneously.

The connecting shaft 54 is rotatably supported by the main body 4 by a bearing 56. The gear 55 meshes with the gear 22. After all, the rotation of the output shaft 51 of the servomotor 50 is caused by the pinion 52 and the gear 5
3, gear 55, gear 22, drive shaft 21, key 24, cam follower body 23, and roller 25 are rotationally driven.

Operation An outline of the operation will be described below with reference to the indexing operation flowchart of the indexing tool post in FIG. When an indexing operation command for the turret is issued, a control device (not shown) calculates the indexing direction of the face plate 2 for indexing the commanded indexing surface and the number of indexing surfaces, and calculates the indexing pattern of the turret 61. Select (S ₃ ). Next, the servo motor 50 is activated, and at the same time, a current is passed through the solenoid 47 to activate the pusher 48. The pusher 48 drives the adjustment bolt 38, the pressing portion 37, and the link 36.

By this drive, the link 36 drives the push rod 35 forward to push the annular clutch 30 forward through the joint 34. By the forward movement of the annular clutch 30, the clutch teeth 33 formed on the annular clutch 30 and the clutch teeth 26 of the cam follower body 23 come into contact with each other at the convex portions. Further, this drive causes the lever 39 to swing about the shaft 41 to move the locator 43 against the spring 45, but the lever 39 is not completely removed from the indexing positioning hole of the turret 61.

In parallel with these operations, the output of the servo motor 50 is the output shaft 51, the pinion 52, the gear 53, the gear 55, the gear 22, the drive shaft.
Roller 25 is rolled in annular cam groove 16 via 21, key 24 and cam follower body 23. However, the turret 61 and the annular clamp member 11 do not rotate with respect to the main body 4 by the locator 43, that is, the annular cam groove of the annular clamp member 11 does not rotate.
Each roller 25 rotates in the inside of 16.

When each roller 25 rolls in the annular cam groove 16, each roller 25
Moves from the straight groove 16a which is the clamp area to the curved groove 16b which is the unclamp area (see FIG. 2). The movement of the cam follower body 23 in the front-rear direction is restricted by the linear groove 16a in the region of the linear groove 10a, but each roller 25 is curved by the curved groove 16b.
By entering the area of, the annular clamp member 11 is moved relatively forward. By the forward movement of the annular clamp member 11, the coupling teeth 13 provided integrally with the annular clamp member 11, the fixed coupling teeth 14 of the main body 4 and the turret cylinder 60 are provided.
The meshing with the coupling tooth 8 is disengaged.

Further, the cam follower main body 23 rotates relative to the annular clutch 30, the clutch teeth 33 of the annular clutch 30 and the clutch teeth 26 of the cam follower main body 23 are in phase with each other, and are engaged with each other, and are pressed by the push rod 35. The annular clutch 30 also moves forward, and the locator 43 penetrates through the indexing positioning hole 9. After this state, the servo motor 50 is once stopped. (S ₆ ). On the other hand, simultaneously with this movement, the clutch teeth 17 of the annular clamp member 11 are also inserted into the clutch teeth 26 and mesh with each other (S ₇ ).

Insertion portion 44 of the locator 43, it is confirmed by the proximity switch 46 that exits the indexing positioning hole 9 (S _8). After this confirmation, the servo motor 50 is restarted. The rotation output of the servo motor 50 is the output shaft 51, the pinion 52, the gear 53,
The connecting shaft 54, the gear 55, the gear 22, the drive shaft 21, the key 24, and the cam follower body 23 are sequentially driven. By this drive, the cam follower main body 23 starts turning.

At this time, since the clutch teeth 26 of the cam follower main body 23, the clutch teeth 33 of the annular clutch 30, and the clutch teeth 17 of the annular clamp member 11 are in mesh with each other, the annular clamp member 11 is rotated. Since the annular clamp member 11 is connected to the turret 61 by the key 12, the turret 61 is rotated. One tool surface of the turret 61 is indexed and driven (S ₉ ) when the servomotor 50 rotates about half a turn (FIG. 4 (a)). This indexed position is detected by the encoder at the rear of the servo motor (which detects the rotation of the turret 61 and is not shown) to detect the desired tool surface position (S ₁₀ ). If it detects that the desired tool surface has been indexed, the solenoid
Turn OFF 47 (S ₁₁ ).

When the current of the solenoid 47 is turned off, the pusher 48 moves backward, the lever 39 swings around the shaft 41, the locator 43 is pushed forward by the force of the spring 45, and the insertion portion 44 is indexed into the positioning hole 9. Insert it. At the same time, link 3
6. The annular clutch 30 is moved rearward via the push rod 35. This movement, the clutch teeth 33 and clutch teeth 26, meshing is disengaged (S _13). Insertion portion 44 of the locator 43 to confirm whether it is inserted into the indexing positioning holes 9 in the proximity switch 46 (S _14).

Then, the servo motor 50 is rotated in the reverse direction to output the output shaft 51, the pinion 52, the gear 53, the connecting shaft 54, the gear 55, the gear 22, and the drive shaft 2.
1. Rotate the cam follower body 23 via the keys 24.
Since the turret 61 and the annular clamp member 11 cannot be rotated by the locator 43, only the cam follower body 23 rotates. By the rotation of the cam follower main body 23, the roller 25 rolls in the annular cam groove 16 and enters the area of the curved groove 16b to move the annular clamp member 11 rearward.

As a result, the coupling teeth 13 of the annular clamp member 11 are
Engage with the coupling teeth 8 of the turret cylinder 60 and the fixed coupling teeth 14 of the body 4. Therefore, the turret cylinder 60 is positioned and fixed to the main body 4 (S ₁₅ ). After detecting that clamps the turret 61 in the rotational position of the encoder (S _16), the servo motor 50 is stopped (S _17). The indexing operation of the indexing tool post described above is shown in FIGS. 4 (a) and 4 (b) as a time chart.
Since the indexing operation has been described with reference to FIG. 3,
Detailed description is omitted.

Second Embodiment In the first embodiment, the acceleration during deceleration during turning of the turret 61 is always constant. However, this acceleration / deceleration time constant is set so that a stable swing indexing operation can be performed without shock even if a tool is attached to the turret 61 in an unbalanced state. Therefore, when the tool is mounted on the turret 61 in a well-balanced manner, the acceleration / deceleration time constant can be set higher.

In this embodiment, after the tool is attached to the turret 61, the turret 61 is manually rotated once or more to detect the load thereof, and the optimum acceleration / deceleration time constant is selected to change the setting. The present invention relates to an indexing tool post control device that shortens the indexing tool index time. FIG. 5 is a functional block diagram showing the control device of this embodiment, and FIG. 6 is a flow chart showing the procedure for changing the setting of the acceleration / deceleration time constant. In FIG. 5, a processor (CPU) 71 centrally controls the entire control device.

A bus line 72 is connected to the processor 71. The bus line 72 has a CRT 73 as a display unit, a keyboard 74 as an input unit, a ROM 80 in which a system control program is stored, a RAM 81 in which parameters and the like are stored. Are connected. The NC machining program memory 75 is a memory in which machining programs are stored. The turret turning servomotor 50 is connected to the bus line 72 via a position control circuit 82 and a servo drive circuit 83.

The respective signals of the tacho generator 85 and the pulse encoder 86, which are the output signals of the turret turning servomotor 50, are fed back to the position control circuit 82 and the servo drive circuit 83 as feedback signals. The load detection unit 87a is
It is a load detection means for detecting the load during the turning operation of the servomotor 84, and in this embodiment, it detects the current. The A / D converter 87b is an A / D converter, and is for A / D converting the output of the load detection unit 87a and outputting it to the turret turning load detection means 88.

The indexing motion curve program memory 76 stores a turning motion program of the servomotor 50, and a program capable of executing a smooth turning motion in relation to time and indexing angle position. In this example, the calculation program is stored in memory. Indexing direction, number of faces calculation means 77
Is a calculating means for calculating the indexing direction and the indexing surface number when the T code is instructed by the NC machining program. The load-acceleration / deceleration correspondence table file 79 stores a correspondence table for selecting an optimum time constant for acceleration / deceleration in consideration of the load of the servo motor 50 when the tool is attached to the turret 61.

The swing acceleration / deceleration time constant setting means 78 selects the optimum acceleration / deceleration time constant for the load state from the servo motor load value during turret rotation along the load / acceleration / deceleration correspondence table file 79, and selects the selected value. Is a turning acceleration / deceleration time constant setting means for rewriting the acceleration / deceleration time constant of the RAM 81. In this example, a program for the operation is built in.

The turret turning load detecting means 88 is a means for storing the maximum value of the load during turning operation while the load of the servo motor 50 during turret turning is input from the load detecting section 87a. Each means and each memory are also connected to the bus line 72. The machine sequence control device 90 is a device that performs sequence control of the machine, and is connected to a solenoid of the indexing tool post, a proximity switch, and a manual operation panel 92.

The operation of this embodiment will be described with reference to the flowchart of FIG. When the machine tool is powered on and ready for operation, first the acceleration / deceleration time constant for the servo motor 50 of the indexing tool rest is set to the standard setting value (step
S ₅₁ ). This standard setting value is a setting value that allows smooth acceleration / deceleration even if the tool is unbalancedly mounted on the turret. If the operator finds that the tool is well mounted in a well-balanced state and that it is OK to accelerate or decelerate more rapidly, the push button switch for turret rotation on the manual operation panel 92 is pressed.

If the turret turning push button switch is pressed (Step S _52), the process proceeds to step S _53. Wait for the pressed to be pressed in step S _52, the process proceeds to step S _57. Load of the servo motor 50 when the turret turning in step S _53, that is, the current value is detected by the load detection section 87a, through the A / D converter 87b is outputted to the turret turning load detecting means 88. The turret turning load detecting means 88 compares the load data sent from moment to moment and stores the maximum value of the load of the servo motor 50 during the turret turning.

In step _S54 , it is determined whether or not the pressing of the turret push button switch is stopped. If the pressing is stopped, the process proceeds to step _S55 , and if the pressing is continued, the process proceeds to step _S53 . Return. Step turret in S ₅₅ it is determined whether the detected load in all pivot positions to pivot more than 360 ° i.e. one revolution or more (step S
₅₅ ).

When it is determined that the vehicle has made one or more turns, the turning acceleration / deceleration time constant setting means 78 changes the acceleration / deceleration time constant for the servomotor 50 by using the maximum load value of the turret turning load detection means 88 and the load. -Specify the acceleration / deceleration time constant from the acceleration-corresponding data file 79 and change the setting value of the parameter of the RAM 81 (step _S56 ). In step S _57, the power supply of the machine tool to determine whether it is OFF, when the power supply OFF, when the power supply becomes the end is left ON state in step S _58, the process returns to step S _52, Wait for the next acceleration / deceleration time constant change.

After changing the acceleration / deceleration time constant, when the T code is read in the NC machining program, the swing indexing operation is executed according to the program in the indexing operation curve program memory. Becomes a changed numerical value, and the servomotor 50 is driven at an acceleration / deceleration speed that is steeper or sloping than when the previous setting value was used.

Since the optimum acceleration / deceleration time constant can be set according to the mounting state of the tool of the turret in this way, the indexing operation time can be further shortened.

[Other Embodiments] In the second embodiment, the maximum load value during turning of the turret (2) is detected, and the servo motor (50) is detected from this maximum load value.
Select the optimal time constant from the load-acceleration / deceleration correspondence table file (79) that stores the acceleration / deceleration time constant setting value corresponding to the load value of the servo motor. (50) is indexed.

However, the load-acceleration / deceleration correspondence table file (79)
It is also possible to store the calculation formula without providing the above and set the acceleration / deceleration time constant by this calculation formula. Alternatively, the static weight of the turret (2, 60) may be detected, and the acceleration / deceleration time constant may be simply set based on this weight value.

[Effects of the Invention] As described in detail above, the present invention realizes a high-speed index and a tool post having high accuracy and high rigidity because the positioning clamp by the coupling is performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an indexing tool post of a machine tool, FIG. 2 is a development view showing cam grooves, coupling teeth and clutch tooth shapes, and FIG. 3 is an operation of the first embodiment. FIG. 4 (a) is a time chart showing the indexing operation of the servo motor, FIG. 4 (b) is a time chart showing the operation of each clutch, solenoid, and rough pin, and FIG. 5 is the second embodiment. FIG. 6 is a functional block diagram showing an example control device, and FIG. 6 is a flow chart diagram showing an outline of the operation of the control device of FIG. 1 ... Indexing tool post, 2 ... Face plate, 3 ... Shaft body, 4 ... Main body, 5 ... Bearing, 7 ... Fixed coupling, 8,13 ... Coupling teeth, 9 ... Indexing Positioning hole, 11 …… Annular clamp member, 14 …… Fixed coupling tooth, 50 …… Servo motor

Claims (2)

[Claims] 1. A turret (2,60) having a plurality of tool mounting surfaces, each tool mounting surface having a tool fixed thereto, and positioning means (43,44) for positioning the turret (2,60) at a predetermined angular position. ), A first coupling tooth (8) formed on the turret (2, 60) in an annular shape at an equal angular pitch, and a main body (4) for rotatably supporting the turret (2, 60). Fixed coupling teeth (14) provided in an annular shape at equal angular pitches, and second coupling teeth (13) simultaneously meshing with the first coupling teeth (8) and the fixed coupling teeth (14)
And an annular clamp member (11) for fixing the turret (2,60) to the main body (4), and the annular clamp member (11) on the turret (2,60) only in the axial direction. Coupling means to allow relative movement to (1
2), an annular cam groove (16) provided in the annular clamp member (11) in the circumferential direction, and a cam follower (25) contacting the annular cam groove (16) are fixed, and a drive shaft ( 21) a cam follower main body (23) movably provided only in the axial direction, a biasing means (27) for biasing the cam follower main body (23) in the axial direction, and a gear to the drive shaft (21). A servo motor (50) for rotationally driving and stopping rotation via a first clutch tooth (26) annularly formed on the cam follower body (23), and annularly formed on the annular clamp member (11). And a second clutch for engaging the first clutch tooth (26) and indexing and driving the annular clamp member (11) through the drive shaft (21).
A clutch tooth (17) and an annular third clutch tooth (33) that meshes with the first clutch tooth (26) are formed, and are rotatably provided on the drive shaft (21) and the annular clamp member (11). ) Annular clutch (30) provided movably only in the axial direction
And an annular clutch drive means (47, 35) for sending the annular clutch (30) in the axial direction to disengage the third clutch tooth (33) and the first clutch tooth (26). An indexing tool post for machine tools characterized by having. 2. The servomotor (50) for rotating the turret (2, 60) according to claim 1.
RAM (8 for setting the acceleration / deceleration time constant when driving
1) and a turret swing load detection means (88) for detecting and storing a maximum load value during swing drive of the servo motor (50).
And the servo motor (5 when turning the turret (2,60)
0) The load-acceleration / deceleration correspondence table file (79) storing the acceleration / deceleration time constant set value for the load value and the maximum load value detected by the turret turning load detection means (88), Deceleration correspondence table file (7
By means of 9), the optimum value of the acceleration / deceleration time constant of the servomotor (50) is specified, and the swing acceleration / deceleration time constant setting means (78) for rewriting the acceleration / deceleration time constant in the RAM (81), It has a file and a central processing unit (71) that controls each of the means, and controls the servo motor (50) with an optimum acceleration / deceleration time constant corresponding to the mounting state of the tool on the turret (2, 60). An indexing tool post of a machine tool having a control device characterized by controlling.