JP2586297B2 - Mandrel control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of feeding a coil material supplied through a feeding means to a processing machine in accordance with a supply amount by rotating a holding portion of the coil material by a drive motor, or a processing machine. The present invention relates to a mandrel for winding a coil material discharged from a mandrel, and more particularly to a control device for controlling a feeding or winding speed of the coil material in the mandrel.

[0002]

2. Description of the Related Art When a coil material, which is an elongated strip-shaped material wound in a substantially cylindrical shape, is used in press working or the like, a mandrel is generally used as a means for holding the coil material.

FIG. 3 shows an example of a press line including a mandrel. Reference numeral 1 denotes a press machine, and 2 denotes a die including an upper die and a lower die. Reference numeral 3 denotes a feeder, which sandwiches the coil material 6 between a pair of upper and lower rolls and intermittently supplies the coil material 6 with a predetermined length in accordance with the processing speed of the press machine 1. Also, 4
Is a pair of upper and lower loop sensors for detecting the upper limit position and the lower limit position of the loop of the coil material 6.

[0004] Reference numeral 5 denotes a mandrel. This mandrel can be held in a state where the coil material is wound around the holding portion 5a. The holding section 5a is driven to rotate by a motor (not shown) and can feed out the coil material. The control device 5b controls the motor based on a detection signal from the loop sensor 4.

The control device 5b is configured to switch the operation / stop of the motor and to switch the rotation speed of the motor in a stepwise manner in accordance with the output signal of the detection means 4.

That is, when the loop amount of the coil member 6 decreases and the coil member 6 comes into contact with the upper loop sensor 4, the upper loop sensor 4 outputs a motor start signal. The control device 5b receives the start signal from the upper loop sensor 4, drives the motor, and draws out the coil material. When the coil material 5 comes into contact with the lower loop sensor 4 due to an increase in the loop amount of the coil material, the lower loop sensor 4 outputs a motor stop signal. The control device 5b is a lower loop sensor 4
Motor is stopped in response to a stop signal from
Stop feeding.

Here, first, the time from the generation of the stop signal to the generation of the start signal is measured.
The controller 6b selects the rotation speed of the motor stepwise so that the feeding speed of the motor can correspond to the line speed.

After that, the control device 5b controls the motor so that the time from the generation of the start signal to the generation of the stop signal is shorter than the time from the generation of the stop signal to the generation of the start signal. That is, if the time interval from the start signal to the stop signal from which the coil material 6 is extended becomes longer, the control device 5b changes the rotation speed of the motor to one step higher.

If the rotation speed of the motor is controlled in this manner, the winding speed of the motor is automatically switched to a high speed even if the winding diameter of the coil member 6 is reduced and the amount of material fed out when the motor is started is reduced. It can correspond to the processing speed of the line.

[0010] The fed coil material is supplied to the press machine or the like by the feeder while being leveled by a leveler or the like as necessary. When the remaining portion of the coil material is subjected to secondary processing after the press working, the remaining portion of the coil material is taken up by another separately prepared mandrel according to the processing speed.

The mandrel is called an uncoiler when it is used as a dedicated machine for feeding out a coil material like the mandrel 5, and when it is used as a dedicated machine for winding a coil material, it is a recoiler. is called.

[0012]

The conventional mandrel control device described above has the following problems. (1) The time from the generation of the stop signal to the generation of the start signal varies not only with the processing speed of the processing line, but also with the distance of the loop, the distance between the pair of upper and lower loop sensors, and the winding diameter of the coil material. Therefore, an appropriate motor speed cannot be selected only by measuring the time from the stop signal to the start signal.

(2) Immediately after the start of the operation of the processing machine, there is a possibility that the loop of the coil material is not at a position where the loop sensor generates a stop signal, and in this case, time cannot be measured.

(3) Control for switching the rotation speed of the motor to a lower speed cannot be performed.

An object of the present invention is to provide a mandrel control device which can always drive a mandrel drive motor at an optimum rotational speed.

[0016]

A mandrel control device according to the present invention feeds a coil material supplied to a processing machine via a feed means in accordance with a supply amount by rotating a drive motor, and outputs the coil material from the processing machine. In the control device of the mandrel that winds the discharged coil material, a detection unit that detects an upper limit position and a lower limit position of the loop of the coil material, and a time measurement that measures a time required for the coil material to reach the lower limit position from the upper limit position of the loop. And a time setting unit for setting a target time for the coil material to reach the lower limit position from the upper limit position of the loop, and a start / stop of the drive motor of the mandrel when the coil material reaches the upper limit position or the lower limit position of the loop. Switching,
A control unit is provided for comparing the target time set by the time setting unit with the measurement time of the time measurement unit to increase or decrease the rotation speed of the drive motor by a predetermined rotation speed.

[0017]

During operation of the mandrel, the detecting section detects the upper limit position and the lower limit position of the loop of the coil material. The time measurement unit
Using the signal from the detection unit, the time required for the loop of the coil material to reach the lower limit position from the upper limit position is measured. The control unit switches between operation and stop of the drive motor when the coil material reaches the upper limit position or the lower limit position of the loop. Further, a preset target time is compared with the time measured by the time measuring unit, and the rotation speed of the drive motor is increased or decreased by a predetermined width.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mandrel control apparatus 10 according to one embodiment of the present invention will be described with reference to FIGS. An uncoiler in a press working line as shown in FIG. 3 is taken as an example of the mandrel. In this embodiment, components other than the mandrel are the same as those of the conventional example described with reference to FIG. Further, the mandrel of the present embodiment has the same mechanical configuration for handling the coil material as the conventional one, but differs from the conventional one in the configuration of the control unit that receives the signal from the detection unit and controls the drive motor.

As shown in FIG. 1, the control section 11 has an operation section 12, a clock 13, a RAM 14, a setting switch 15 and an inverter 16, and receives signals from a detecting means 17 and a switch 18, and 19 is controlled.

The detecting means 17, which is the same as the conventional loop sensor, detects an upper limit position and a lower limit position of the loop of the coil material, and outputs a start signal and a stop signal to the arithmetic section 12, respectively.

First, the arithmetic unit 12 includes an inverter 16
The frequency of the rotation speed of the drive motor 19 is controlled via the
9 is started at a predetermined rotation speed, and the drive motor 19 is stopped when a stop signal is input.

Next, the calculating section 12 has a function as a time measuring section for measuring the time required for the coil material to reach the lower limit position from the upper limit position during operation. That is, the operation unit 12
Sets the time interval (measurement time t) between the start signal and the stop signal continuously input from the detection means 17 to the clock 13
Is measured based on the signal generated.

Further, the calculation section 12 constitutes a time setting section for setting a target time T for the coil material to reach the lower limit position from the upper limit position during operation, together with the setting switch 15 and the RAM 14. That is, the target time T input by the setting switch 15
It is stored in M14.

In the setting switch 15 of the time setting section, the maximum rotation speed F ₁ of the drive motor 19 is set as a starting frequency at the time of starting. Further, the adjustment width Δf of the rotation speed of the drive motor 19 is also set. Both are stored in the RAM 14 together with the target time T.

The calculating unit 12 calculates the target time T
And the measurement time t, and when T> t, the drive motor 19
Is decreased by Δf, Δf is increased if T <t, the current activation frequency is maintained if T = t, and the drive motor 19 is activated at the next activation with this activation frequency. .

The operation mode of the drive motor 19 by the control unit 11 can be selected from automatic operation, manual operation, and inching operation by the switch 18.

Next, the control operation of the drive motor 19 by the control unit 11 during automatic operation will be described with reference to a specific example of the operation state as shown in FIG. The target time T, the maximum rotation speed F ₁ , the adjustment width Δf,
The acceleration / deceleration time is input from the setting switch 15 in advance. Then, when the feeding device 3 starts operating, the loop of the coil material is reduced, and the coil material contacts the upper detecting means 17, whereby a start signal is input and the drive motor 1
9 is started.

At first, the drive motor 19 is started at the maximum rotation speed F ₁ . After the start, the coil material fed out by the rotation of the drive motor 19 comes into contact with the lower detecting means 17 to output a stop signal, and the drive motor 19 is stopped. With the supply to the press machine, the loop of the coil material eventually decreases, and the coil material contacts the upper detecting means 17. Here activation signal is output, the coil material is fed out is started driving motor 19 again in the rotational speed F _1. After time t ₁ has elapsed as shown in FIG. 2, the drive motor 19 is stopped is output stop signal.

The arithmetic unit 12 measures the interval between the start signal and the stop signal, and calculates the measured time t ₁ and the target time T in the RAM 14.
Compare. At this time, the drive motor 19 has the maximum rotation speed F
₁ has been started, the course should better target time T increases, the rotational speed F ₂ of the next boot to minimize Delta] f. That is, F ₂ = F ₁ −Δf. At this time, T <t ₁
If the relationship has occurred, the target time T set or setting of the maximum rotational speed F ₁ of is inappropriate, so that the target time is sufficiently larger than the measurement time t ₁ target time T, the maximum rotational speed F ₁ Reset the settings and restart automatic operation from the beginning.

[0030] Similarly, if you started in the rotation speed F ₂ for the second time, T> t _2, and the rotational speed F ₃ of the next startup to minimize Delta] f. That is, F ₃ = F ₂ −Δf.

The third rotation speed F_ThreeWhen started with
Has a measurement time t until a stop signal is generated thereafter._Three
Is equal to the target time T. Therefore, the rotation speed at the next startup
Degree F _Four= F_ThreeAnd

When the motor is started at the rotation speed F ₄ for the _fourth time, the measurement time t ₄ until the stop signal is generated thereafter
Is larger than the target time T. That is, since T <t ₄ , the rotation speed F ₅ at the time of the next fifth start-up is Δ Δ more than F ₄
Increase by f. That is, F ₅ = F ₄ + Δf.

The drive motor 19 stops when a stop signal is input by the switch 18.

In the control of the drive motor 19 by the control unit 11 described above, when the drive is stopped for a predetermined time or more,
The control unit 11 starts the drive motor 19 from the initial state, assuming that the mandrel feeding or winding operation has been completed.

The setting of the target time T in the present embodiment can be set to an appropriate value according to the actual installation state of the detecting means 17, the mandrel main body, the feeding device or the like. Then, since the rotation speed is controlled in small increments, it is possible to feed out the coil material appropriately in accordance with the winding diameter of the coil material and the working speed of the processing line.

The control when manual operation is selected by the switch 18 is the same as the automatic operation described above except that the output frequency is determined by the external volume.

Even during automatic or manual operation, when inching operation is performed, inching takes precedence, and a frequency determined by the external volume is output. When the jog is turned off, the motor stops when the start / stop signal is off, and when the jog is off and the start signal is on, the speed becomes the speed before the jog operation is performed.

Although an uncoiler is taken as an example in the above-described embodiment, an appropriate coil material can be wound on a recoiler using a similar control unit.

[0039]

According to the present invention, in order to prevent the coil material from scattering,
It is preferable to operate the drive motor of the mandrel at the minimum necessary number of revolutions. Conventionally, even if the speed of the processing line or the winding diameter of the coil material changes, it cannot sufficiently cope with the change, and the feed amount of the coil material may be insufficient.

However, according to the mandrel control device of the present invention, the drive time of the drive motor of the mandrel is compared with a predetermined target time, and the rotational speed of the drive motor is adjusted by a predetermined adjustment width in accordance with the result. Since the correction is performed, the rotational speed of the drive motor is always adjusted to an optimum condition. Therefore, the operator can operate the mandrel without worrying about the change in the speed of the processing line or the winding diameter of the coil material.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a timing chart showing an example of an operating state in one embodiment of the present invention.

FIG. 3 is a diagram showing an example of a conventional press line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine as a processing machine 3 Feeding device as a feeding means 5 Mandrel 6 Coil material 10 Control device 11 Control unit serving also as a time measuring unit and a time setting unit 17 Detecting unit 19 Drive motor

Claims (2)

(57) [Claims] 1. A mandrel control device for feeding a coil material supplied to a processing machine via a feeding means in accordance with a supply amount by rotating a drive motor and winding the coil material discharged from the processing machine. A detecting unit that detects an upper limit position and a lower limit position of the loop of the coil material, a time measuring unit that measures a time required for the coil material to reach the lower limit position from the upper limit position of the loop, and a lower position from the upper limit position of the loop of the coil material. And a time setting unit for setting a target time to reach, while switching the operation / stop of the drive motor of the mandrel when the coil material reaches the upper limit position or the lower limit position of the loop,
A control device for a mandrel, further comprising a control unit for comparing the target time set by the time setting unit and the measurement time of the time measurement unit to increase or decrease the rotation speed of the drive motor by a predetermined rotation speed. 2. The drive motor is controlled by an inverter,
A control device for a mandrel, wherein the starting frequency is increased or decreased by comparing the target time with the measurement time.