JPS5854888B2 - Atsuenkinojidouseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control device for a rolling mill, and more particularly to an automatic control device for a rolling mill in which tension applying machines (for example, linear motors) are provided before and after a rolling stand in order to eliminate off-gauge.

Generally, the thickness of the material to be rolled is achieved by adjusting the roll opening of the rolling stand and the roll speeds of the rolling stands upstream and downstream of the stand.

Here, adjusting the roll speeds of the upstream and downstream rolling stands means that rear tension occurs between the upstream rolling stand and the rolling stand, and forward tension occurs between the rolling stand and the downstream rolling stand. It means.

However, during sheet threading, after the material has been bitten by the rolling stand, at the point in time when the leading edge of the material reaches the next rolling stand or winder, there is no forward tension on the material, so this is inevitable. Therefore, the thickness of the material on the exit side becomes thicker.

In addition, during ash removal, when the tail end of the material leaves the unwinding machine or the subsequent stand while the rolled material is caught in the rolling stand, there is no backward tension on the material. The material exit side plate thickness becomes thicker.

Therefore, in order to eliminate this off-gauge, it is sometimes necessary to narrow the roll opening of the rolling stand during sheet passing and ash removal.

However, narrowing the roll opening degree during sheet threading complicates the control process and method, increases the unevenness of the rolling load distribution of the material, and causes shape defects, resulting in meandering of the material and incomplete threading. It becomes possible.

In addition, removing ash sometimes causes the material to be squeezed out.

Therefore, it is desired to eliminate this off-gauge without adjusting the roll opening degree.

The present invention has been made to meet the above-mentioned needs, and is an automatic control device for a rolling mill that can eliminate off-gauges during sheet passing and sometimes during ash removal using tension applying machines (linear motors) installed before and after the rolling stand. The purpose is to provide

The principle of the present invention will be explained below with reference to FIGS. 1 and 2.

FIG. 1 is a diagram for explaining the state in which tension is applied to the material by a tension applying machine (hereinafter simply referred to as a linear motor) during sheet passing.

This linear motor applies 5 to 10 per unit area to the material.
It is sufficient to have the ability to supply a force of kg/ma or more.

This is because this force of 5 kg/ma is equal to the so-called unit tension supplied to the material between the unwinding machine and the rolling mill, between each stand of the rolling mill, and between the rolling mill and the winding machine.

In the figure, 10 is a rolling stand equipped with a pair of work rolls WR and a buffer roll BUR, and a material 11 is rolled from the left side to the right side in the figure.

LMl. LM1' is a linear motor having a plurality of coils that generate a magnetic field that moves in the longitudinal direction of the material using the material 11 as a rotor, and is provided on the downstream side of the rolling stand 10 so as to face each other and to be separated by a distance l. .

Therefore, linear motor LM1. When power is energized to LM1', LMI and LM1' respectively exert horizontal forces x and tx1' in the same direction as the material 11, and attraction forces (vertical forces) Yl and Y1' that try to pull the material 11 against each other. Occur.

As a result, the material 11 is subjected to a horizontal force Ff=
It receives X1+X1', but since the vertical forces are Y and -Y1', it is not attracted to either.

Therefore, even when the tip of the peeled material is not caught in the winder or the next stage stand during sheet passing, a predetermined tension is applied by the linear motor, so off-gauge as described above does not occur.

FIG. 2 is a diagram for explaining that a linear motor applies tension to the tail end of the material during ash removal.

The linear motor LM2. When power is applied to LM2', LM2. L
M2' is a horizontal force X1. in the direction opposite to the direction of movement of the material. X2'
, Y2° and YZ are generated respectively so as to suck the material.

Therefore, the material 11 is not subjected to a vertical force (Y2=Y2'), but is subjected to a horizontal force -X2+X2' in a direction opposite to the direction in which the material travels, and a backward tension is generated.

Next, control for applying a predetermined tension to the material during sheet passing or ash removal will be explained.

At this time, the tension of the material is as if the tip is placed on the next rolling stand or winding machine during threading, and the tail end is placed on the unwinding machine or the subsequent rolling stand when removing ash. It exists like this.

Therefore, Fig. 1 shows an example of the cutting board.

The tension tf of the material before the leading edge of the material leaves the relevant rolling stand and bites into the next rolling stand is determined by the difference between the outlet plate speed v1 of the relevant rolling stand and the plate speed VL□ given by the linear motor LM1°LM1'. It is given as an integrated quantity.

That is, becomes.

However, E = Young's modulus of material L = distance between rolling stand and linear motor LML LM1' center 1 From this, if the roll speed of the rolling stand is controlled constant, the exit plate speed ■1 will be constant and the tension tf will be linear Motor LM1. It can be adjusted by changing the speed of the moving magnetic field of LM1'.

When removing ash, the tension of the material (rearward) is the same as in the above formula, and tb is the linear motor LM2 in the opposite direction to the direction in which the material moves. LM2
It is expressed by integrating the difference between the speed 2 of ' and the inlet plate speed 2 of the rolling stand.

Therefore, one embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a diagram showing an embodiment in which the present invention is applied to a single rolling stand.

In the figure, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals, and the explanation thereof will be omitted.

10 is a rolling stand, which has a screw lowering device SD for adjusting the roll opening degree and a load cell LC for detecting the rolling load applied to the material.

12 is a rewinding machine, and 13 is a winding machine. CLML;CL
M2 is a linear motor control device that controls the target tension tREF1.
It is controlled so that tREF2 is reached.

AGCL AGC2 is an automatic plate thickness adjustment device that adjusts the roll rotation speed or roll opening degree of the rolling stand 10 so that a predetermined exit side plate thickness is achieved based on the signal from the plate thickness gauge Gh.
When there is a change in the output of GCI or AGC2, it is added to the linear motor control device to more precisely adjust the tension of the material during sheet passing or ash removal, and also constantly detects changes in sheet thickness during rolling. Tension control is performed based on the detection output.

14 is a general control device, which is a linear motor control device CLM1.
．． It controls the operation timing of CLM2.

The operation will be explained below.

First, the material 11 is unwound from the unwinding machine 12 and sent between the work rolls of the rolling stand 10 .

When the material 11 is bitten into the rolling stand 11, the load cell LC outputs an output.

After that, during sheet passing, in response to the output signal of this load cell LC, the overall control device 14 controls the linear motor control device C.
An operation command is output so that LM2 operates.

Thereby, the linear motors LM2 and LM2' are energized to a predetermined tension tREF2, so that the leading end of the material 11 is guided to the winder while maintaining the tension between the rolling stands.

When the leading end of the material 11 is wound onto the winder 13, the armature current of the winder drive motor 13M increases.

Based on the armature current sent to the general control device 14, the general control device 14 sends a control signal to the linear motor control device CLM2 so that the linear motor control device CLM2 is controlled based on the signal from the automatic plate thickness adjustment device AGC2.

Since the linear motor control device CLM1 at this time is also controlled by the automatic plate thickness adjustment device AGC1, when the outlet side plate thickness is not a predetermined plate thickness, the linear motor LM1. LM1', LM2°LM2' are controlled.

By doing so, during rolling, the automatic plate thickness adjustment devices AGCL and AGC2 are controlled in response to the signal from the plate thickness gauge Gh, so that precise plate thickness adjustment can be achieved.

As the tail end of the material moves away from the winder 12, the armature current of the winder drive motor 12M decreases.

Based on this change in armature current, the central control device 14 drives the linear motor control device CLM1 to control the linear motor LM.
1. Activate LM1'.

This linear motor LM1. By the operation of LM1', the material 11 is fed while being applied with tension so as to reach the target tension tREF1.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a diagram showing an embodiment in which the present invention is applied to a tandem rolling mill consisting of three rolling stands.

Of course, a plurality of rolling stands may be used.

First, when the material 11 is unwound from the unwinder 12 and the leading end of the material is bitten by the first rolling stand 101, the load cell LC of that rolling stand generates an output signal.

The general control device 14 is actuated by the signal and sends an operation command signal to the linear motor control device cLM2.

Therefore, linear motor LM2. LM2' is energized as control during rolling of the first rolling stand 101 so that the target tension tREF2 is achieved.

Then, when the tip of the material gets caught in the second rolling stand,
The load cell LC of the rolling stand generates an output signal.

In response to this signal, the overall control device 14 de-energizes the linear motor control device CLM2, and
to support.

Similarly, for the next rolling stand, the winding machine driving motor 1 controls when the material is passed through the winding machine 13.
This is done at 1, which is detected by an increase in armature current of 3M.

When the tail end of the material leaves the unwinder 12 during removal of the ash, the armature current of the unwinder drive motor decreases.

Based on this current change, the central control device 14 gives an operation command to the linear motor control device CLM1.

Thus, as the tail end of the material passes through the first rolling stand 101, the tension is controlled by the linear motors LMI, LMI' to the target tension tREF1.

When the tail end of the material 11 passes through the first rolling stand 101, the output signal of the load cell LC of that rolling stand decreases, so the linear motor controller CLM1 is deenergized by the integrated controller 14, and the linear motor controller C
LM2 is energized.

Thereafter, tail end removal is similarly controlled at step 1, when the tail end of the material 11 is wound up by the winding machine.

As described above, according to the present invention, during sheet threading and bottom removal, by using a linear motor at the tip or tail end of the material, tension similar to that during steady rolling can be applied to the rolling stand. This eliminates the problem of off-gauge during sheet threading or bottom removal as in the past, and the yield is good, and there is no need to adjust the roll opening, so there is no need for complicated control, and the sheet threading work is easy. Its practical effects are quite impressive.

Furthermore, since there is no off-gauge, products with good shapes can be obtained.

Furthermore, since the root threadability is improved, the threading speed (or the speed of bottom removal) can be increased, which improves productivity.

The material to be cut is not only steel, but also any material that can act as a rotor for a linear motor, and it can of course be applied to non-ferrous materials such as aluminum and copper, and its range of applications is wide.

Furthermore, the linear motors LM1-4 can apply tension correction to the material during normal rolling using the plate thickness gauge Gh via the automatic plate thickness adjusting devices AGC1-4, so that more accurate plate thickness control can be achieved.

Note that the linear motors LM1 to LM4 can also be configured to carry out the same conveying action, for example, with the leading end of the material biting into the first rolling stand.

Further, although an example has been shown in which the near motors are provided facing each other so as to sandwich the material, it is of course possible to use only one motor, and in that case, a support roller R8 as shown in FIG. 5 may be provided.
Various modifications can be made without departing from the spirit of the invention.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams for explaining the operating principle of the present invention (during sheet passing and ash removal), and Figures 3 and 4 are diagrams showing the single rolling stand and tandem rolling stand of the present invention. FIG. 5 is a diagram showing another embodiment of the present invention. LM1-4. LM1'~4'---Linear motor, CLM1~4---Linear motor control device,
AGC1~4...Automatic plate thickness control device, 12...
...Rewinding machine, 13... Winding machine, 14...
...General control device.

Claims (1)

[Claims] 1. In a rolling mill having a rolling stand for rolling a material to a predetermined thickness, a threading tension applying machine is installed downstream of the rolling stand during threading and operates when the material is caught in the next stand or winder. , or the ash removal is sometimes provided upstream of the rolling stand and the material passes through the unwinding machine or the upstream stand. The linear motor control device controls the tension of the tension applying machine to a target tension in order to supply a predetermined tension to the material, and the linear motor control device controls the tension of the tension applying machine to a target tension in order to supply a predetermined tension to the material. It is equipped with a general control device that supplies signals such as operation timing and tension correction amount, and always supplies a predetermined tension to the material using a tension applying machine for passing through the material or a tension applying machine for removing ash, and adjusts the thickness of the plate at the exit side of the rolling stand. An automatic control device for a rolling mill, characterized by controlling the control to a predetermined value.