JPH1071440A - Feeder control device for press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeder control device that drive-control servo motors operating synchronously with a press, without using an uninterruptible power supply for the servo motor. SOLUTION: An electric power is supplied by an A.C. power source A through an AC/DC converter 4 to an inverter 56 driving servo motors 7, 8 that operate synchronously with a press, with a capacitor 9 provided storing this supplied power, so that the servo motors 7, 8 are driven by the charged power of this capacitor 9 at the time of power failure. The power for a controller 3 at the time of power failure is supplied through a second converter by a small uninterruptible power supply 2 or by the charged power of the capacitor 9. Thus, at the time of power failure, the servo motors 7, 8 are drive-controlled, synchronously operating a press and a feeder until the charged power is reduced, thereby preventing mechanical intervention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is used when the operation of a feeder driven by a servomotor requires synchronous operation with a press machine, particularly when the feeder interferes with the press machine when a power failure occurs. .

[0002]

2. Description of the Related Art When a power failure occurs, a press machine activates a brake to start an abrupt stop, and stops after a certain period of time while decelerating. When a feeder driven by a servomotor needs to be operated synchronously with the press machine, the feeder includes a control device, a servo driver, a servomotor, and an uninterruptible power supply. It is sufficient to drive these servo motors in order to drive the operation of the feeder driven by this servo motor in synchronization with the press machine until the press machine that starts stopping and the decelerating press machine completely stops, There is a prior art feeder control device provided with a large uninterruptible power supply and operating synchronously with a press machine.

[0003]

The case where synchronous operation of a feeder driven by a servomotor and a press machine is required is described below.
If the synchronous operation is not performed, the feeder may interfere with the press machine, the mold installed in the press machine, or the material to be pressed. As an example of this, there is a transfer feeder driven by a servomotor and a press machine equipped with the transfer feeder. When a power failure occurs, the slide of the press machine and the transfer feeder do not stop immediately even if both start to stop, but stop after coasting, respectively.

However, the amount of coasting of the press machine is large,
The coasting amount of the transfer feeder is small. For this reason, the phase of the press machine during the stop and at the time of the stop is different from the phase of the transfer feeder, and depending on the phase of the press machine at the time of the occurrence of the power failure, the feed bar including the fingers of the transfer feeder and the press bar are installed on the press machine. It is well known that interference with a mold occurs.

In order to avoid this interference in the event of a power failure, the servomotor driving the operation of the feeder causing the interference operates synchronously, and the servomotor driving the operation of the other feeders stops immediately. It is an object of the present invention to provide a control device.

[0006]

In order to solve the above-mentioned problems, a servomotor that drives the operation of a feeder in which the above-described interference occurs from the time of the occurrence of a power failure until the press machine is completely stopped is replaced by a press machine. In order to operate in synchronism with the above, a capacitor for supplying electric power for driving the servomotor is provided. This capacitor is configured to be supplied with power via an AC / DC converter while being supplied with power from an AC power supply, and to retain charge power. The control device of the feeder is configured to be supplied with electric power from the uninterruptible power supply device or the charged electric power of the capacitor via the second converter.

[0007] In the control device, the servo motor that drives the operation of the operation axis of the feeder in which the above-described interference occurs is operated in synchronization with the press machine until the supplied charge power of the capacitor decreases in the event of a power failure. Control and immediately stop the servomotor that drives the operation of the operation axis that does not require synchronous operation.

If the charge power stored in the capacitor is not sufficient and the servo motor driving the operation of the operation axis that performs the synchronous operation due to the decrease of the charge power becomes unable to perform the synchronous operation with the press machine, the control device sets the charge power , The servomotor is coasted for a time set in advance in the control device, and then stopped to prevent interference.

In the control device, whether or not the synchronous operation with the press machine is necessary is set in advance by the operation of the operation axis of the feeder. Then, the control device stops these servo motors and simultaneously activates the brake of the operation axis of the feeder.

[0010]

The power stored in the capacitor is supplied to the servo driver for the servo motor that drives the operation axis of the feeder that operates synchronously with the press machine, and only the servo motor that requires the synchronous operation is driven. The operation of this operation axis of the feeder can be continued without providing the uninterruptible power supply.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, an uninterruptible power supply 2 is connected to an AC power supply A, and a control device 3 for a feeder is connected to the uninterruptible power supply 2.

From the AC power supply A, the AC / AC
Inverters 5 and 6 are connected via a DC converter 4, and servo motors 7 and 8 are connected to the inverters 5 and 6, respectively. There may be one or a plurality of servomotors 7 that continue to operate synchronously with the press machine when a power failure occurs, and one or more servomotors 8 that do not need to operate synchronously may be provided. There are cases.

A capacitor 9 is provided between the inverter 5 and the AC / DC converter 4, and during the period when power is supplied from the AC power supply, the voltage is smoothed and the capacitor 9 is always supplied. Power, that is, a state in which charge power is held. Further, whether or not the AC power supply A has failed is determined by the power failure detection means 10.
, And a power failure detection signal 10 a is output to the control device 3.

The phase of the press machine (not shown) is detected by an encoder 11 provided in the press machine, and the detected phase signal 11a is output to the control device 3. Based on the phase signal 11a, the control device 3 The servo motors 7 and 8 are drive-controlled by controlling the inverters 5 and 6.

Even if a power failure occurs when the press machine and the feeder 1 are operating synchronously, the control unit 3 has an uninterruptible power supply 2
, And the inverters 5 and 6 that drive the servo motors 7 and 8 are supplied with power from the capacitor 9. As a result, the control device 3 that has obtained the power failure detection signal 10a from the power failure detection means 10 performs an output for stopping the press machine and operates the feeder that needs the synchronous operation until the charging power of the capacitor 9 decreases. Is controlled so that the servo motor 7 for driving the motor is driven in synchronization with the press machine by the phase signal 11a of the encoder 11.

In this way, the servo motor 7 is operated synchronously with the press machine by the charging power of the capacitor 9, and the press machine, the mold, the material, etc., and the operation axis of the feeder 1 are driven to a position where they do not interfere with each other. And the control device 3
When the amount of charge power of the condenser 9 is not sufficient, the brake 7A of the servomotor 7 is set for a time set in the control device 3 in advance in order to further move the operation axis of the feeder 1 for synchronous operation to a position having a margin. Is kept inactive and the servomotor 7 is coasted.

In FIG. 2, the controller 3 is supplied with electric power from the AC / DC converter 4 via the second converter 12 during normal operation, and supplies electric power from the capacitor 9 via the second converter 12 during a power failure. Is supplied.

Since the control device 3 can be operated with a small amount of electric power, it can be operated at the time of a power failure by using a part of the charge power of the power supply capacitor 9 for the servo motor 7 at the time of the power failure. The configuration does not require the provision of the power failure power supply device.

In the case where the feeder 1 is a servo-driven transfer feeder used for a transfer press, when the feed bar is in a clamped state and the power is cut off and the synchronous operation is stopped, the feed bar or a press working provided on the feed bar is provided. There is a case where the finger and the mold that hold the parts to be interfered interfere with each other and are crushed.

In order to avoid this situation, the operation of unclamping the feed bar must be performed in synchronism with the press machine, and this unclamping operation is driven by the operation driven by the inverter 5 and the servo motor 7. And so on.
If it is necessary to perform the unclamping operation during the time when the press machine is completely stopped after the occurrence of the power failure, the control device 3 continues the synchronous operation of the servo motor 7 that drives the operation axis.

The operation of the feeder which does not interfere even if the synchronous operation is not performed is equivalent to the operation of driving by the inverter 6 and the servo motor 8 by the advance return operation and the clamp operation of the feed bar. In the case of these operating states while the press machine is completely stopped from the time of the power failure, the control device 3
Immediately stops or does not operate the servo motor 8 for driving these operation axes.

As is apparent from the above description, the operation axis which requires the synchronous operation of the feeder 1 to avoid interference with the press machine or the like is a part of a plurality of operations of the feeder. Since the driving of the motor can be performed only by the required amount up to the position where the interference is avoided, it is not necessary to provide an uninterruptible power supply for the servomotor, and the above-mentioned present invention using the capacitor 9 having a required capacity requires the synchronous operation. Required servo motors can be driven.

In the case of the operation of the feeder 1 which is considered not to interfere with the press machine and the feeder 1, when the power failure detection signal 10a is obtained, in addition to the above, for example, the brake 8A is immediately activated, and the servomotor 8 is stopped. Needless to say, the operation axis of the feeder 1 driven by the servo motor 8 may be stopped.

It is needless to say that the operation of the feeder which requires synchronous operation and the operation which does not need, which are determined by the combination of the feeder and the press machine, may be set in the control device in advance.

[0025]

According to the present invention, it is possible to obtain a small and inexpensive feeder control device for a press machine which drives an operation shaft of a feeder which needs to be operated synchronously with the press machine during a power failure without using an uninterruptible power supply device for a servomotor.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of the present invention.

FIG. 2 shows a block diagram of a main part of another embodiment of the present invention.

[Explanation of symbols]

1 is a feeder, 2 is an uninterruptible power supply, 3 is a control device, 4
Is an AC / DC converter, 5, 6 are inverters, 7, 8
Is a servo motor, 7A and 8A are brakes, 9 is a capacitor, 10 is a power failure detection means, 10a is a power failure detection signal, 11
Is an encoder, 11a is a phase signal, 12 is a second converter, and A is an AC power supply.

Claims (3)

[Claims] At least one of the operation axes of a feeder is driven by a servomotor, and the control apparatus of the feeder operates synchronously with a press machine. The control apparatus includes: a servomotor that drives an operation axis of the feeder; Uninterruptible power supply for supplying power to the power supply, an inverter for driving the servomotor, and A for supplying power from the AC power supply to the inverter.
It comprises a C / DC converter and a capacitor that smoothes the output while the AC / DC converter outputs power to the inverter and holds the charge power. When a power failure occurs, the control device is supplied with power from the uninterruptible power supply device, the servo motor is supplied with the charge power of the capacitor, and the control device continues the synchronous operation of the servo motor and the press machine until the charge power decreases. A feeder control device for a press machine, characterized in that the device is a device. 2. A brake is provided on the operation axis of the feeder, and when a power failure occurs, (a) when the operation of the feeder is a continuation of the synchronous operation with the press machine and an operation preset in the control device, this operation axis is The servo motor that drives the motor is driven and controlled until the charge power of the capacitor decreases, and the synchronous operation with the press machine is continued.In some cases, after this servo motor is coasted for a certain period of time, The brake provided is operated to stop the operation of the feeder. (B) If the operation of the feeder is set in advance in the controller so that synchronous operation with the press machine is unnecessary, the synchronous operation of the servomotor that drives this operation axis is immediately stopped, or the charge power of the capacitor is reduced. After the drive control is performed until the amount decreases, the synchronous operation with the press machine is continued, and then the brake provided on the operation shaft is operated immediately to stop the operation shaft of the feeder. 2. The feeder control device for a press machine according to claim 1, wherein the control device is the above control device. 3. A feeder control device, wherein at least one of the operation axes of the feeder is driven by a servomotor and the feeder operates synchronously with a press machine, the control device comprises: a servomotor for driving the operation axis of the feeder; , An AC / DC converter for supplying power to the inverter from an AC power supply, and smoothing the output while the AC / DC converter and the AC / DC converter output power to the inverter. And a second converter provided between the capacitor and the control device. When a power failure occurs, the servomotor is supplied via the inverter, and the control device is supplied with the charge power of the capacitor via the second converter. After the power failure occurs, it is necessary to perform a synchronous operation with the press machine until the charge power decreases. A feeder control device for a press machine, wherein a servomotor that drives an operation axis of a feeder is a control device that continues operation in synchronization with the press machine.