JP2654556B2 - Wire electric discharge machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire electric discharge machine for smoothly feeding a wire electrode.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view showing a system of a conventional wire electric discharge machine. In the figure, 11 is a wire electrode, 12 is a wire bobbin, and the wire electrode 11 wound around the wire bobbin 12 is guided and sent out to the traveling system. 13a and 13b are guide pulleys, and wire electrodes 1
1 is run stably, and the running direction of the wire electrode 11 is changed. Reference numeral 14a denotes a brake unit, which uses a powder brake (electromagnetic brake ) system, and which is used to move the wire electrode 11 while it is running.
Is given a predetermined tension.

[0005] 15a and 15b are wire guide pulleys.
The wire electrode 11 is arranged on a straight line with respect to a workpiece (described later).
This is a guide that guides and eliminates positional deviation. A workpiece 16 is processed by the wire electrode 11 . Reference numeral 17 denotes a pair of collection rollers, which are driven by a collection motor (not shown), which stretches the wire electrode 11 by sandwiching the wire electrode 11 between the rollers and collecting the wire electrode 11 .

Reference numeral 18 denotes a pair of wire electrode feeding rollers which feed the wire electrode 11 at a predetermined speed stable to an automatic wire feeder (described later). A drive motor 19 drives the wire electrode delivery roller 18. 20 is a rotation speed detector, which is a wire electrode
11 and the rotation of the wire electrode delivery roller 18 is detected. An automatic wire feeder 21 stretches the wire electrode 11 sent from the wire electrode feed roller 18 and automatically inserts the wire electrode 11 into the workpiece 16.

[0005] Conventional wire electric discharge machining apparatus is constructed as described above, the operation of the device from FIG. In the figure, a wire electrode 1 wound around a wire bobbin 12 is shown.
1 is sent out through the guide pulleys 13a and 13b, the wire guide pulleys 15a and 15b, and the brake portion 14a while being pinched by the drive motor 19, and is inserted into the automatic wire supply device 21.
Workpiece 16 and wire guide pulley 15 automatically
It is wound up at a predetermined speed while being sandwiched by the collecting roller 17 after passing through b, and one path is stretched and collected. At this time, the rotation speed of the wire electrode feed roller 18 is controlled at a constant voltage, and the speed is controlled by a detection signal of a rotation speed detector 20 attached to the wire guide pulley 15a.

[0006]

In the above-described conventional wire electric discharge machine, when the tension applied to the wire electrode 11 fluctuates, the wire guide pulley 15a to which the rotation speed detector 20 is attached has uneven rotation. And the drive motor 19 of the wire electrode feed roller 18 also fluctuates in torque, so that the two influence each other. Further, there is a problem that the feed speed of the wire electrode becomes uneven. Further, there has been a problem that the aging reliability of the delivery roller cannot be secured due to the uneven rotation of the delivery roller and the fluctuation of the wire tension due to the aging of the brake portion 14a.

Further, if the wire electrode feeding speed becomes uneven, the wire electrode 1 buckles in the automatic wire feeding device 21 or the wire electrode 11 slips and curls due to the wire electrode feeding roller 18. Work 16
There is a problem in that the original function of the automatic wire feeding device capable of automatically inserting and automatically connecting the wire is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and controls the rotation speed or the wire tension of a wire electrode feed roller so that the wire runs stably and the automatic wire feeder operates smoothly for a long time. An object of the present invention is to obtain a wire electric discharge machine capable of operating and automatic operation.

[0009]

According to the present invention, there is provided a wire electric discharge machine comprising: a brake motor for driving a brake section for applying a predetermined tension to a wire electrode; a rotation speed value of the brake motor; A speed setting unit that outputs a speed difference signal by the difference between the two, a brake motor control unit that drives the brake motor based on the input of the speed difference signal, and a drive motor that sends the wire electrode to an automatic wire supply device; A drive motor control unit that drives the drive motor using the rotation speed value as a rotation speed set value and stops the drive motor when the rotation speed value fluctuates beyond a predetermined range.

A brake motor for driving a brake unit for applying a predetermined tension to the wire electrode; and a brake motor control unit for outputting a brake control signal based on a rotation speed value of the brake motor and a wire feed speed command value. , a recovery drive motor to recover the wire electrode, driving the recovery
In accordance with the rotational speed value of the moving motor and out feeding the wire electrode to the automatic wire feeder, the recovery motor is stopped
A drive motor that stops feeding the wire electrode when
On the basis of the rotational speed value and the wire feed speed command value of the recovered drive motor drives the recovery drive motor, the recovery driving the rotation speed value to stop the recovery drive motor when varied over a predetermined range And a motor control unit.

Also, a brake motor for driving a brake unit for applying a predetermined tension to the wire electrode, a drive motor for sending the wire electrode to an automatic wire feeder, and a wire tension command value for running the wire electrode, A wire feed speed command value is output to the brake motor and the wire feed speed command value is output to the drive motor and the brake motor control unit, and the wire tension command value and the wire tension command value are output when the rotation speed of the wire electrode during traveling changes beyond a predetermined range. An NC control unit for stopping the output of the wire feed speed command value, and a speed difference signal based on a difference between the wire feed speed command value from the NC control unit and the rotation speed value from the brake motor is output to the brake motor. And a brake motor control unit.

[0012]

According to the present invention, the rotational speed value of the brake motor 2 and the wire feed speed command value are input to the speed setting unit 4, and a speed difference signal is sent from the speed setting unit 4 to the control circuit 1 based on the speed difference. Output to the brake motor control unit. Then, the brake motor control unit drives the brake motor based on the input of the speed difference signal. On the other hand, the rotation speed value is input to the drive motor control unit of the control circuit 1, and the drive motor control unit drives the drive motor based on the rotation speed value. If the rotation speed value fluctuates beyond a predetermined range, the drive motor control unit stops the drive motor.

Further, the rotation speed value of the brake motor 2 and the wire feed speed command value are input to the brake motor control unit 1B, and the brake motor control unit 1B controls the brake motor based on the rotation speed value and the wire feed speed command value. Drive the motor. On the other hand, the rotation speed value of the collection drive motor 22 and the wire feed speed command value are input to the collection drive motor control unit 1A, and based on the rotation speed value and the wire feed speed command value, the collection drive motor control unit 1A Recovery drive motor 17
Drive. Further, the drive motor 19 is driven by the rotation speed value. If the rotation speed value fluctuates beyond a predetermined range, the collection drive motor control unit 1A stops the collection drive motor 17 and stops the drive motor 19.

The NC control unit outputs a wire feed speed command value a to the drive motor 18 and the brake motor control unit 1C and a wire tension command value b to the brake motor 2 in order to make the wire electrode 11 run. Then, the drive motor 19 causes the wire electrode 11 to travel, and the brake motor controller 1C controls the rotation speed value 3 of the brake motor 2 to 3.
The drive of the brake motor 2 is controlled by a speed difference signal based on a speed difference between a and a wire feed speed command value a and a wire tension command value b from the NC control unit. On the other hand, the NC control unit stops outputting the wire feed speed command value a and the wire tension command value b when the running speed of the wire electrode fluctuates beyond a predetermined range, and outputs the drive motor and the brake motor. To stop.

[0015]

FIG. 1 is a system schematic diagram showing a route of a wire electric discharge machine according to an embodiment of the present invention.
Reference numerals 3a, 13b, 15a, 15b to 19, 21 are the same as those of the conventional device. In the drawing, reference numeral 1 denotes a control circuit which sends a rotation speed control signal 1a to a drive motor 19 based on a rotation speed detected by a brake motor rotation speed detector (described later) provided in a brake motor (described later). Output (drive motor control unit) to control the rotation speed of the drive motor 19, and to the brake motor 2 based on the input of a speed difference signal (described later) from a speed setting circuit (described later). (A brake motor control unit) to control the rotation speed of the brake motor 2.

Reference numeral 2 denotes a brake motor, which uses a DC motor, and drives a brake unit (described later) to apply tension to the wire electrode 1 by a rotation speed control signal 1b from the brake motor control unit of the control circuit 1. It is a motor. 3
Is a brake motor rotation speed detector, and the brake motor 2
And outputs the feedback signal to the control circuit 1 and the speed setting circuit (described later). A speed setting circuit 4 controls a speed difference signal 4a based on a speed difference between an NC command value of the wire feed speed (wire feed speed command value a) and a rotation speed signal 3a detected by the brake motor rotation speed detector 3. Output to the brake motor control unit of the circuit 1.

Reference numeral 14 denotes a brake unit, which uses a double-wound rubber roller having a double-wound rubber provided on a pulley. The brake motor 2 is driven by a brake motor speed control signal 1b from a brake motor control unit of the control circuit 1. Brake part 1
Numeral 4 always rotates the wire electrode 1 at a stable speed without changing the tension to maintain a constant tension. In addition, no slip occurs between the wire electrode 11 and the brake unit 14. That is, the brake unit 14 has a function of stabilizing the entire traveling path of the wire electrode 11.

The wire electric discharge machine is constituted as described above, and this apparatus will be described with reference to FIG. In the figure, a wire electrode 11 wound around a wire bobbin 12 is connected to guide pulleys 13a and 13b, wire guide pulleys 15a,
In order to stably and automatically insert the wire electrode 11 from the automatic wire feeder 21 into the workpiece 16 at a predetermined speed, the wire electrode 11 is driven via the wire electrode feed roller 18. The motor 19 must be controlled to a stable speed.

Therefore, the rotation speed of the brake unit 14 controlled by the brake motor control unit of the control circuit 1 is detected by the brake motor rotation speed detector 3, and the detected amount is detected by the drive motor control of the control circuit 1. By performing feedback control on the driving motor 19 for driving the wire electrode feeding roller 18 from the section, torque fluctuation and rotation unevenness due to wire tension are eliminated, and the wire electrode feeding roller 18
Can always feed the wire electrode 11 into the automatic wire feeder 21 at a stable rotation speed. When the rotation speed of the brake motor 2 fluctuates and the rotation of the drive motor 19 fluctuates accordingly, the drive motor control unit of the control circuit 1 drives the motor immediately after fluctuating beyond a certain reference value and exceeding a threshold. The rotation control signal 1a to the motor 19 is stopped to stop the wire electrode 11.

Further, since a DC motor is used as the brake motor 2 for driving the brake unit 14, tension can be more stably applied to the wire electrode 11. Therefore,
Since a stable tension is always applied to the wire electrode 11 via the brake unit 14, the chronological reliability of the brake unit 14 can be ensured. In this way, the automatic supply of the wire electrode 1 is performed more smoothly than in the past, and the reliability of the automatic wire supply device can be significantly improved.

FIG. 2 is a system schematic diagram showing a route of a wire electric discharge machine according to another embodiment.
1,12,13a, 13b, 14,15a, 15b, 1
7 to 19 and 21 are the same as above. In the figure,
Reference numeral 1A denotes a collection motor control unit, which is a wire feed speed command value a which is an NC command and a rotation speed detection signal (described later) detected by a collection motor rotation speed detector (described later) provided on a collection drive motor (described later). In response to the input, a speed control signal (s) for controlling the recovery motor to a constant rotation speed is output to the recovery drive motor.

Reference numeral 1B denotes a brake motor control unit which receives the wire feed speed command value a and the rotation speed detection signal 3a detected by the brake motor rotation speed detector 3 provided in the brake motor 2 to input a brake motor control signal. A brake control signal (b) for controlling the rotation speed of the brake motor 2 to a constant rotation speed is output to the brake motor 2. Reference numeral 22 denotes a recovery drive motor, which is a rotation speed control signal (s) from the recovery motor speed control circuit 1A.
Is driven at a constant speed. Reference numeral 23 denotes a collection motor rotation speed detector, which is provided on the collection drive motor 22, detects the rotation speed of the collection drive motor 22 to be driven, outputs a rotation speed detection signal 23a to the collection motor speed control unit 1A, and Output to # 19. The drive motor 19 is
The wire electrode delivery roller 18 is driven based on the rotation speed detection signal 23a.

The wire electric discharge machine is constituted as described above. The recovery motor speed controller 1A controls the recovery drive motor 22 by the wire feed speed command value a, which is an NC command, and the rotation speed detection signals 3a, 23a. Is feedback-controlled to a constant rotation speed, the brake motor control unit 1B feedback-controls the brake motor 2 to a constant rotation speed, and a detection value from a collection motor speed detector 23 provided in the collection drive motor 22 is provided. Drive motor 19
Therefore, in the system path of the wire electrode 11, torque fluctuation and rotation unevenness due to wire tension are eliminated, and the wire electrode 11 can always be run at a stable speed. When the brake motor 2 and the recovery drive motor 22 fluctuate, and the drive motor 19 fluctuates accordingly, the recovery motor speed controller 1A immediately fluctuates beyond a certain reference value and exceeds a threshold. The rotation speed control signal (s) to 22 is stopped, and the wire electrode 11 is stopped.

FIG. 3 is a system schematic diagram showing the path of a wire electric discharge machine according to another embodiment.
1,12,13a, 13b, 14,15a, 15b, 1
7 to 19 are the same as above. In the figure, reference numeral 1C denotes a brake motor control unit which controls a rotation speed value 3a detected by a rotation speed detector 3 provided in the brake motor 2 and an NC.
A wire feed speed command value a from a control unit (not shown)
(Constant speed value), the speed difference signal 2b based on the speed difference is output to the brake motor 2 to perform feedback control. When the wire electrode 11 travels, the NC control unit sends a wire feed speed command value a to the brake motor control unit 1C and a wire tension command value b to the drive motor 1C.
9 to drive the traveling system, and when the detection value of the rotation speed detector 20 provided on the wire guide pulley 15a fluctuates beyond a predetermined rotation speed range, the wire feed speed command value a Then, the output of the wire tension command value b is stopped to stop the traveling system.

The wire electric discharge machine is constituted as described above, and the wire electrode 1 wound around the wire bobbin 12 is provided.
1 is stretched via guide pulleys 13a and 13b, wire guide pulleys 15a and 15b, and a brake unit 14,
An automatic wire feeder 21 for feeding a wire electrode 11 at a predetermined speed.
In order to stably and automatically insert the workpiece into the workpiece 16, the rotation speed is detected by a brake motor rotation speed detector 3 provided on the brake motor 2, and the detected value and a wire for driving the drive motor 19 are detected. The feed speed command value a is input to the brake motor control unit 1C, and the brake is determined by a value obtained by adding the speed difference signal 2b based on the speed difference by the brake motor control unit 1C and the wire tension command value b from the NC control unit. The motor 2 is feedback-controlled. Then, the torque fluctuation and the rotation unevenness due to the wire tension are eliminated, and the wire electrode feed roller 18 can always feed the wire electrode 11 into the automatic wire feeder 21 at a stable rotation speed. Since a DC motor is used as the brake motor 2 for driving the brake unit 14,
Tension can be applied to the wire electrode 11 more stably.

When the rotation speed of the brake motor 2 fluctuates and the rotation speed of the drive motor 19 fluctuates accordingly (the fluctuation of the rotation detection value c of the rotation speed detector 20 provided on the wire guide pulley 15a is detected). When it is detected by the NC control unit), the output of the wire feed speed command value a and the wire tension command value b is stopped as soon as the voltage fluctuates beyond a certain reference value and exceeds the threshold value, and the wire electrode 11 is fed. stop. Thus, the stable tension is always applied to the brake unit 14.
Can be applied to the wire electrode 11 via the wire electrode 11 so that the aging reliability of the brake portion 14 is ensured, and the wire electrode 1
1 is performed more smoothly than in the past, and the reliability of the automatic wire feeder can be significantly improved.

[0027]

As described above, according to the present invention, a wire feed speed command value, a brake motor rotation speed value, or a wire feed speed command value, a brake motor rotation speed value, and a recovery drive motor rotation speed. By controlling the speed based on the value, the torque fluctuation and the rotation unevenness due to the wire tension are eliminated, the lowering of the insertion rate into the workpiece due to the poor feeding of the wire electrode is prevented, and the long time high speed is maintained. The operation rate can be secured, and automated operation can be performed. Further, according to the present invention, a wire electrode
The rotation speed value of the collection drive motor by the collection of
When it exceeds, the recovery drive motor stops and
Drive motors stop, so stop these motors.
It can be determined that the connection of the wire electrode has been completed
The effect has been obtained.

[Brief description of the drawings]

FIG. 1 is a system schematic diagram showing a path of a wire electric discharge machine according to an embodiment of the present invention.

FIG. 2 is a system schematic diagram illustrating a route of a wire electric discharge machine according to another embodiment.

FIG. 3 is a system schematic diagram showing a path of a wire electric discharge machine according to another embodiment.

FIG. 4 is a system schematic diagram showing a path of a conventional wire electric discharge machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control circuit 1A recovery drive motor control unit 1B, 1C brake motor control unit 2 brake motor 3 brake motor rotation speed detector 4 speed setting unit 11 wire electrode 12 wire bobbin 13a, 13b guide pulley 14 brake unit 15a, 15b wire guide pulley 16 Workpiece 17 Recovery roller 18 Wire electrode delivery roller 19 Drive motor 21 Automatic wire feeder

Claims (3)

(57) [Claims] A brake motor that drives a brake unit that applies a predetermined tension to a wire electrode; a speed setting unit that outputs a speed difference signal based on a difference between a rotation speed value of the brake motor and a wire feed speed command value; A brake motor control unit that drives the brake motor based on the input of the speed difference signal, a drive motor that sends the wire electrode to an automatic wire supply device, and the drive motor that uses the rotation speed value as a rotation speed set value. And a drive motor control unit that stops the drive motor when the rotation speed value fluctuates beyond a predetermined range. 2. A brake motor that drives a brake unit that applies a predetermined tension to a wire electrode, a brake motor control unit that outputs a brake control signal based on a rotation speed value of the brake motor and a wire feed speed command value. , a recovery drive motor for collecting the wire electrode, the wire electrode out feeding into automatic wire feeder according to the rotation speed value of the recovery drive motor, the recovery drive motor
A drive motor for stopping the feeding of the wire electrode when the motor is stopped, the driving the recovery drive motor based on the rotation speed value of the recovery drive motor and said wire feed speed command value, the rotational speed value is predetermined A recovery drive motor control unit that stops the recovery drive motor when the recovery drive motor fluctuates beyond a range. 3. A brake motor for driving a brake unit for applying a predetermined tension to the wire electrode, a drive motor for sending the wire electrode to an automatic wire feeder, and a wire tension command value for running the wire electrode. The wire feed command value is output to the brake motor and the wire feed speed command value is output to the drive motor and the brake motor control unit, and the wire tension command value and the wire tension command value are output when the running speed of the wire electrode fluctuates beyond a predetermined range. An NC control unit for stopping output of the wire feed speed command value; and outputting a speed difference signal to the brake motor based on a difference between the wire feed speed command value from the NC control unit and a rotation speed value from the brake motor. A wire electric discharge machine comprising a brake motor control unit.