JPS5973112A - Controlling system of dancer-roll type with drawing machine - Google Patents

Abstract

PURPOSE:To control a wire drawing machine so that it starts smoothly without causing die back, by supplying electric current corresponding to a set signal to a DC motor by a command of starting a wire drawing machine, before starting operation by releasing a brake. CONSTITUTION:In a control device 20 of a dancer-roll type wire drawing machine, a torque, which provides a minimum tension necessary for producing a wire rod stretched state while overcoming a back tension of wire rod 1, is previously set to a torque setter 25. This set minimum electric current is supplied to a DC motor 14 by a command of starting the drawing machine. A brake 12 is released after confirming the flow of the current. Then, the setter 25 is disconnected when a switch 26 is turned off, and a running current to the limit of a limiter 24 is provided to the DC motor 1 to put the drawing machine in a running state. By this method, the starting is smoothly performed without causing die back.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for a dancer roll type wire drawing machine that is capable of preventing die-back of the wire that occurs when the wire drawing machine is stopped and smoothing the start-up of the wire drawing machine.

A conventional dancer roll type wire drawing machine has been used with the configuration shown in FIG. In the figure, 10 is the wire drawing block concerned, and 5 is the wire drawing block in the preceding stage.

1 is a wire, 2 is a dancer roll, 3 is a detector for detecting the position of the dancer roll 2, 4 is a position signal transmitter for the detector 3, and 6 is a mask speed setter.

11 is a rotating drum, 12 is a brake coupled to the rotating drum, 13 is a die, 14 is a DC motor that drives the rotating drum 11, 15 is a speed generator that detects the rotation speed of the DC motor, and 16 is a DC motor 14 is a cyrisk device that controls the voltage applied to the motor, 20 is a speed controller, and 21 is a ratio setter.

In FIG. 1, a wire 1 is pulled from a wire drawing block 5 at the front stage to a rotating drum 11, passes through a dancer roll 2, is drawn at a die 13, runs in the direction of the arrow, passes through a dancer roll at a rear stage, and is stretched at a rear stage. Head to the line plot. When the DC motor 14 that drives the rotating drum 11 is turned off and the wire drawing machine is stopped, back tension of the wire 1 occurs at the die 13, and back tension due to the action of the dancer roll increases the tension fJ to wire yield 1. Due to the strength of the wire rod 1, the wire rod 1 moves in the opposite direction to that during wire drawing, that is, it is diced back, and the die 13 causes scratches on the surface of the wire rod 1. In order to prevent die-back, a brake 12 is directly connected to the rotating dojim 11 so that the brake is applied at the same time as the wire drawing machine is stopped, but this causes inconvenience in starting the wire drawing machine. That is, if voltage is applied to the motor 14 after opening the brake 12, the above-mentioned diceback will occur, so a method is used in which voltage is first applied to the motor 14 according to the driving signal and then the brake is opened after a certain period of time. However, in this case, it is very difficult to set the braking force of the brake and the time from applying voltage to the motor to releasing the brake, and if the release of the brake is delayed, the motor remains locked and 100% Since current flows, if this time is long, it has the disadvantage of damaging the motor.

Further, the brake requires a braking force sufficient to maintain the torque at 100% current.

The present invention significantly reduces the capacity of the brake that was conventionally required, and also solves the above-mentioned difficulties in setting the braking force and brake release time, and allows the wire drawing machine to start smoothly without dieback. The purpose of this invention is to provide a control method for a dancer roll type wire drawing machine.

The present invention incorporates a torque setting device for setting the torque corresponding to the back tension η of the wire profit and a switch for connecting/disconnecting the setting signal from the setting device into the control device of the DC motor that drives the rotating drum. The above objective is achieved by controlling the line machine to start operation by applying a current corresponding to the setting signal to the DC motor in response to a command to start the line machine, and then releasing the brake.

FIG. 2 shows an embodiment of the invention. In the same figure, 1 is the wire rod, 5 is the wire drawing block in the previous stage, and 6 is the mask speed setting device.
0 is the wire drawing block. There are two dancer rolls located between the wire drawing blocks 5 and 10, and an output 3 for detecting the position is coupled to the dancer rolls, and the signal from the position detector 3 is sent to a position signal transmitter 4. Additional points 22 via
sent to. The wire drawing block 10 has a die 13 and a rotating drum 11 driven by a DC motor 14, a brake 12 is connected to the rotating drum 11, and a speed generator 15 is connected to the DC motor 14. ing. The alternating current power source 18 is converted into direct current by a sirisk device 16 via a current transformer 17 and is supplied to the direct current motor 14 .

20 is a control device for the DC motor 140 that drives the wire drawing block, which includes a ratio setter 210,000, a speed control amplifier 23, a limiter 24, a torque setter 25, and
It is equipped with 6 switches, 28 torque control amplifiers, and 29 phase control devices. Points 22 and 27 are signal addition points.

The content of the present invention will be described in detail below in Figure 2.

The wire rod 1 is drawn in the wire drawing stand 5 in the previous stage, pulled by the rotating drum 11 of the wire drawing stand, passed through the tongue roll 2 and drawn by the die 13, and then runs in the direction of the arrow to be drawn in the subsequent stage. Enter the wire drawing stand in the latter stage via the dance hall. Since the configuration and operation of each wire drawing block are the same, the control device 20 of the wire drawing block will be described.

In the control device 20, 21 is a ratio setting device for setting the speed of the DC motor 14 of the wire drawing block in accordance with the area reduction rate of the die 13, and the voltage at the output terminal of this ratio setting device 21 is the mask speed setting device. It is designed to change according to the set value of the device 6. The output signal of this ratio setter 21 is added to a summing point 22 to calculate the difference with the signal of a speed generator 15 that detects the speed of the DC motor 14, and a position signal transmitter 4 indicating the position of the dancer roll 2. The output is input as a correction signal 17, and the signal resulting from the calculation is applied to the speed control amplifier 23. The output signal of the speed control amplifier 23 is applied to the limiter 24, but since the switch 26 is open during operation of the wire drawing machine, the torque setting device 25 is disconnected, and the output of the limiter 24 is applied to the torque setting device 25. is not restricted by. The output signal of the limiter 24 is applied to the summing point 27, and the difference between the armature current of the DC motor 14 and the negative feedback from the current transformer 17 is calculated, and the difference signal is applied to the torque control amplifier 28.

The output signal of the torque control amplifier 3 is applied to a phase control device 29, and the output of this phase control device 29 is applied to the gate of the thyristor device 16 to control the firing phase of the thyristor device vi6, thereby controlling the DC motor. The speed of 14 is controlled. Then, when the wire drawing machine is stopped, the DC motor 14
is made non-voltage to prevent the brake 121C from dicing back the brake wire 1. The pack density 37 of the wire 1 when the wire drawing machine is stopped varies depending on the material of the wire 1, the area reduction rate of the die 13, and the tensile force of the dancer roll 2.
5 is set in advance to a torque that provides the minimum tension necessary to apply the pack tension of the wire rod 1 to the wire rod 1 in a taut state. Note that the value of pack strength is generally 10% or less of the tensile force during wire drawing. The switch 26 is open both when the wire drawing machine is in operation and when it is stopped, but it is designed to be closed when a command to start the wire drawing machine is issued. Therefore, the DC motor 14
Since a current that generates a torque preset by the torque setting device 25, that is, a torque equal to the pack tension, flows through the brake 1, confirm that this current has flowed.
2 is opened, but the wire drawing machine remains stopped because the pack tension of the wire rod 1 and the torque generated by the DC motor are balanced. When the switch 26 is opened, the torque setting device 25 is disconnected, and the DC electric motor 14 is supplied with an operating current up to the limit of the limiter 24, and the wire drawing machine enters the operating state. Since the torque and current of the motor are proportional, the current of the DC motor required to generate the torque corresponding to Beck tension is about one-tenth of the operating current as mentioned above, so the loss inside the motor is about one-tenth of the operating current. It's only 1. With the control method of the present invention, the wire drawing machine is started by supplying a current that balances the pack tension to the motor and then releasing the brake before starting operation, so there is no die-back, and unlike the conventional method, there is no There is no need to adjust the open time, so starting is performed smoothly, and even if the motor is locked, the loss generated internally is 1/100 of that during operation, so there is no risk of damage. Furthermore, the braking torque required for the brake 12 is equal to the pack tension, that is, 1/10 of the braking force of the conventional brake, so the brake can be made extremely compact, and the cost can be significantly reduced. It is Noh.

In the above-mentioned ft+lj both types, when the wire drawing machine is stopped, the DC motor 14 is set to no overpressure, and the brake 12 is activated to prevent the dieback based on the pack tension of wire 1, but at the same time as the wire drawing machine is stopped. When the switch 26 is closed and the torque setting device 25 is turned on, what is the current a seen in the back tension of the wire 10? If the DC motor 14 is energized, the wire drawing machine will come to a halt even if the brake 12 is not activated. That is, braking; A
12 can be eliminated, maintenance and inspection of the brake is unnecessary, and the cost can be reduced to a large IU.
As mentioned above, the power loss caused by energizing the electric pA is extremely small, 1/100 of that during operation, so there is no risk of damage to the motor.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional roll-type greening machine.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1... Wire rod, 2... Gunra roll, 3... To position detection 4... Position signal transmitter, 5... Previous stage wire drawing block, 6 - Mask speed setting device, 10... Applicable Wire drawing block, 11... Rotating driver L, 12... Braking/Iso, 1
3... Chair, 14... DC motor, 15... Speed generator, 16... Thyristor device, 17... Current transformer, 18... AC power supply, 2o... Control equipment, 21 ... Ratio setter, 22 ... Addition point, 23 ... Speed control amplifier, 24 ... Limiter, 25 ... Torque setting device 526 ...
・Switch, 27. Addition point, 28. Torque control amplifier,
29...Phase control device. , 510 i / θ two regions - example

Claims (1)

[Claims] 1) Wire drawing in which a wire is wound around a rotating drum having a brake provided in each of a plurality of stages of wire drawing blocks, and each rotating drum is driven by an individual DC motor to pull out the wire from a die. In the dancer roll drawing machine I143M, in which a dancer roll is provided between each wire drawing block, the minimum current for making the wire taut by applying the sowing tension to the wire drawing machine start command is set to the above 1α current. A control method for a dancer roll type wire drawing machine, characterized in that after energizing the electric motor, the brake of the rotating drum is released, and then the operation of the wire drawing machine is started. 2. In the control system of the dancer roll type wire drawing machine described in claim 1, the wire is stretched by relying on the back tension of the line phase without using the brake of the rotating drum while the wire drawing machine is stopped. A control method for a dancer roll type wire drawing machine, characterized in that the DC motor is energized with a minimum current to achieve a state.