KR100758468B1 - Method for detecting metal-in state - Google Patents

Abstract

The present invention relates to a metal-in detection method for notifying the start of all control in a rolling mill, and after the metal-in is detected in the F (n) stand, a predetermined distance (5.5) is moved and the next stand is F (n + 1). The stand is automatic metal-in, and when the F3 stand metal-in, the actual roll force from the F4 stand to the F7 stand is known by the memory roll force, so that the metal-in can be detected accurately.

Rolled, Metal-In, Roll Force, Roll Gap, Roll Shift, Looper,

Description

Metal phosphorus detection method {METHOD FOR DETECTING METAL-IN STATE}

1 is a configuration diagram of a facility of a hot rolling mill.

2 is a logic diagram of a conventional metal-in detection device.

3 is a view for explaining a method for calculating the distance between the front end stand and the rear end stand using a pulse generator.

4 is a logic diagram illustrating a metal-in detection method according to the present invention.

5 is a flowchart showing a conventional metal-in detection method.

6 is a flowchart showing a metal-in detection method according to the present invention.

* Description of the symbols for the main parts of the drawings *

1,12: stand screw drive motor 2,13: roll gap detection device

3,14: screw 4,15: rolling force detecting device

5: rolled material 6: looper

7: looper driving motor 8: looper motor rotation detection device

9,18: rolling roll 10,16: rolling roll driving motor

11,17: rolling roll speed detection device

The present invention relates to detecting a metal-in state, which is a standard for all equipment control in a rolling process. More specifically, the metal-in time is detected from a distance and a speed between rolling rolls, and a roll force after completion of a roll shift. The present invention relates to a metal-in detection method for preventing premature operation of a looper by storing and accurately detecting metal-in even during rolling of a thin material.

1 is a schematic view showing the after-rolling process of a hot rolling mill. When there is no rolled material in the F (n) stand rolling roll 9 and the F (n + 1) stand rolling roll 18, the F (n) stand is shown. Since the roll force detected by the reduction force detection device 4 and the F (n + 1) stand reduction force detection device 15 is 100 tons or less, the metal-in can be detected normally well.

By the way, even when the rolling material 5 is not inserted into the F (n) stand rolling roll 9 and the F (n + 1) stand rolling roll 18 at the time of rolling, the rolling rolls 9 and 18 are kissed. In the state, especially 400 tonnes depending on the type of material to be rolled by the roll force without the rear end of the multiple stands (F1 to F7) of the rolling mill, ie without the rolled material (5) from the F4 stand to the F7 stand. Up to 700 tonnes at.

In order to produce the rolling coil required by the demand in the hot rolling facility, the relay 30 of FIG. 1 is turned on at an accurate time, and the AGC (Automatic Gauge Control) control unit 31, the looper control unit 32, and the speed control unit ( 33) is operated.

Therefore, the metal-in signal is the most important in order to make a product required by the demand. For example, more specifically, if the metal-in is not detected, the F (n) stand and F (n +) of FIG. 1) The looper 6 which detects the speed unbalance of the stand does not operate, and when the rolled material 5 is inserted into the F (n) stand and the F (n + 1) stand, the speeds do not coincide with each other. At (33), the speed of the F (n) stand and the F (n + 1) stand cannot be automatically adjusted, so rolling cannot be performed.

On the contrary, when metal-in is detected first, the looper 6 which detects the speed unbalance of the F (n) stand and the F (n + 1) stand is raised at the same time as the rolling material is applied to the F (n) stand and the rolled material is Will cause the malfunction of the F (n + 1) stand.

As such, accurate measurement of metal phosphorus is very important in rolling control.

FIG. 2 is a logic diagram illustrating a conventional metal-in detection device, and FIG. 6 is a flowchart illustrating a conventional metal-in detection process. In the related art, the CSP ON signal 37 is input and the F1 stand metal in is not a condition. At time 38, 0 tons are stored in the memory roll force of the F1 stand (39), and then if the condition signal 40 for knowing the memory roll force of the F7 stand at the F2 stand is live, the means 41 By this, the actual roll force from the F2 stand to the F7 stand is stored as the memory roll force.

Then, the metal-in is calculated by the condition 49 for making the metal-in signal from the F1 stand to the F7 stand, and the metal-in roll force value is calculated from the console 19 of FIG. 20), and sets the F (n + 1) stand roll force value 22 to the memory roll force when the F (n) stand metal-in contact 21 is turned on. Then, when the rolled material 5 is charged to the F (n + 1) stand, the actual roll force 23 is the sum of the metal-in roll force 20 and the memory roll force 22. If larger, the F (n + 1) stand is normally metalized.

FIG. 5 is a flowchart illustrating a conventional metal-in detection process. In the related art, when the F1 stand is metal-in (S3), it corresponds to the actual roll force detected by the pressing force detecting device of all the stands of F3 to F7 at that time. After putting in the memory roll force (S4), the metal-in roll force force 20 and the memory roll force force 22 are added, and are larger than the actual roll force force 23 compared with the roll force force comparison means 25, respectively. In the stand of the metal-in process, if it is small is treated so as not to the metal-in process.

By the way, since the roll gap is reset after the roll shift is completed in the F4 stand, which is the rear stand of the rolling mill, when the rolling material 5 is F1 stand metal-in, the rear stands are resetting the roll gap of the rolling roll. Therefore, the memory roll force force 22 is 0 tons, but the actual roll force force is detected from 400 to 700 tons after the roll gap reset is completed.

In this case, when the rolled material 5 is charged with the F (n) stand, the rolled material 5 is not inserted into the F (n + 1) stand at the same time as the F (n) stand metal-in, but the metal-in roll force force 20 ) And the memory roll force force 22 are greater than the actual roll force force, so that it is recognized as a metal-in, and the looper 6 is raised up in advance. This prevents the rolled material 5 from borrowing into the F (n) stand.

The present invention has been proposed in order to solve the above-mentioned conventional problems, and an object thereof is to detect metal-in time from a distance and speed between rolling rolls, and to remember the roll force force after completion of the roll shift, so that the metal-in can be carried out even when rolling in a thin film. By precisely detecting, the present invention provides a metal-in detection method intended to prevent premature operation of a looper.

As a constitutional means for achieving the above object of the present invention, the metal-in detection method according to the present invention in the hot rolling facility consisting of a plurality of rolling stands (F1 ~ F7),

Checking whether the strip tip has entered the cut point;

Storing 0 tons with a memory roll force of the F1 stand when the strip leading edge enters the cut point;

Determining the F1 stand metal in when the detection roll force of the F1 stand is greater than the reference range than the memory roll force;

At the point in time of the F1 stand metal, storing the actual roll force of the F2 stand as a memory roll force and then determining the metal in by the roll force comparison of the F2 stand;

Storing the actual roll force of the F3 stand as a memory roll force at the time of the F2 stand metal, and determining whether the metal is to be rolled by comparing the roll force of the F3 stand; And

For each F4 to F7 stand, the front stand (F (n)) (n is 4 to 7) calculates the moving distance of the strip when it is metal, so that the strip moving distance is greater than the distance from the rear stand (F (n + 1)). When it is, characterized in that it comprises the step of generating a metal in signal for the rear end (F (n + 1)).

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to attached drawing.

The present invention is a method for precisely metal in the rolling mill in a hot rolling mill that performs a roll shift, F (n) stand and F (n + 1) stand in the configuration of the control system of the hot rolling mill 1 After the shift is completed, the roll force force 22 is stored to prevent the looper 6 detecting the speed unbalance of the F (n) stand and the F (n + 1) stand from being up early, and F (n) The distance detected after the F (n) stand is metal-in by the signal detected by the stand rolling roll speed detecting device 11 (that is, the distance between the F (n) stand and the F (n + 1) stand, for example, 5.5m), the next stage F (n + 1) stand is automatically metal-in.

As described above, two metal-in detection methods according to the present invention are applied.

First, since the roll gap is reset after completion of the roll shift, the memory roll force force 22 is remembered after the roll gap reset is completed.

As shown in FIG. 4, the present invention stores the F1 actual roll force force in the F1 stand memory roll force 57 at CSP ON 37, and knows the memory roll force force of the F7 stand in the F2 stand. The means 40 stores the F2 stand memory roll force 58, and the condition means 59 for knowing the memory roll force of the F3 stand is stored in the F3 stand memory roll force 60, and the F4 stand. If the condition means (61) to know the memory roll force of the F7 stand is increased, the means for moving the actual roll force from the F4 stand to the F7 stand to the memory roll force (62) from the F4 stand to the F7 stand. The actual roll force force is stored in the roll force force storage section 22 of FIG.

Then, the roll gap is reset after completion of the roll shift, because the roll gap is reset after the completion of the roll shift. Is inserted into the F (n) stand, the F (n) stand is metal-in, and the F (n + 1) stand is the metal-in roll force force 20 and the memory roll when the rolled material 5 is not charged. Since the actual roll force force is smaller than the sum of the force forces 22, metal-in is not obtained. Accordingly, the looper 6 also does not rise prematurely and the rolled material 5 can be normally borrowed into the F (n) stand.

Second, the metal-in time point is computed using the F (n) stand rolling roll speed detection apparatus 11 and F (n + 1) stand rolling roll speed detection apparatus 12 of FIG.

As shown in Fig. 3, when the distance between the F (n) stand and the F (n + 1) stand is 5.5m, after the F (n) stand is metal-in, when the strip proceeds 5.5m, the next The F (n + 1) stand is also automatically metal-in.

That is, the distance the strip moves by the rotation of the F (n) stand rolling roll 9 by the driving of the F (n) stand rolling roll driving motor 10 is the F (n) stand rolling roll driving motor ( It calculates from the rotation speed of 10). This is as shown in Equation 1 below.

L (Length) = D (Roll Diameter) * Circumference) * N (Rotation Speed)

P (Pulse Number) = A (36Pulse per 1 revolution) * N (rpm)

Ps (pulse per 1 pitch) = A * L / * D * GR

In FIG. 4, when the metal-in signal 45 for use in the distance calculation is applied, the condition means 63 for producing the metal-in signal by calculating the distance between the stands is operated, which is a shear stand metal-in signal. When M1098X is applied, the distance is then counted in MW1350X to generate the distance calculation metal-in signal M370X according to the present invention when it is equal to the set distance (K5500, for example 5.5m).

Then, even if the metal-in signal calculated by comparing the F4 stand roll force is not generated, the F4 stand metal-in signal 64 calculated by the distance is applied to drive the output signal for driving the F4 stand metal-in relay ( 53) is output. Similarly, the time of arrival of the next stand is calculated through the strip travel speed according to the distance between the stands, thereby continuously generating the metal-in signal of the rear stand. Accordingly, the normal metal in signal is generated at the rear stands F4 to F5 to drive the respective metal in relays 30 so that the AGC control unit 31, the looper control unit 32, and the speed control unit 33 can be controlled. do.

Fig. 6 is a flowchart showing the metal-in detection method according to the present invention. In the present invention, when the strip tip part enters the cut point (S1), 0 ton is put into the F1 memory roll force (S2). Then, the strip enters the F1 stand and the F1 stand is methane treated if the actual measured roll force is greater than the memory roll force.

As described above, when the F1 stand is metal-in (S3), the actual roll force of the F2 stand is put in the F2 memory roll force (S4), and similarly, if the F2 stand is metal-in by roll force comparison (S5), F3 The actual roll force of the stand in the F3 memory roll force. Then, when the measured roll force is greater than the memory roll force, an F3 stand metal in signal is generated, and as described above, if the F3 stand metal-in (S7), the actual of all the rear stands (F4 stand to F7 stand) The roll force is stored in the memory roll force (S8).

And, as described above, if the F4 stand is metal-in by the roll force comparison (S9), the moving distance of the strip is calculated and moved by the distance of the next stand (5.5m), the metal-in signal for the next stand (F5 stand). Similarly, the metal in signal for the F6 and F7 stands also calculates the moving distance of the strip from the metal stand of all the stands, and generates the metal in signal when the next stand is reached ( S11-S12).

As described above, in the present invention, the rear end stands F4 to F7 of the plurality of rolling stands are configured to store the roll force force at the time when the roll gap reset is completed, using the memory roll force, While the metal in state is detected when it grows, it checks whether the strip is moved by the distance from the front stand at the time of the metal stand of the front stand through the distance calculation with the front stand and generates the metal in signal of the next stand. An error signal has an excellent effect of preventing the looper from rising prematurely.

Claims (2)

In the hot rolling facility consisting of a plurality of rolling stands (F1 ~ F7) of the metal phosphor detection method of each stand, Checking whether the strip tip has entered the cut point; Storing 0 tons with a memory roll force of the F1 stand when the strip leading edge enters the cut point; Determining the F1 stand metal in when the detection roll force of the F1 stand is greater than the reference range than the memory roll force; At the point in time of the F1 stand metal, storing the actual roll force of the F2 stand as a memory roll force and then determining the metal in by the roll force comparison of the F2 stand; Storing the actual roll force of the F3 stand as a memory roll force at the time of the F2 stand metal, and determining whether the metal is to be rolled by comparing the roll force of the F3 stand; And For each F4 to F7 stand, the front stand (F (n)) (n is 4 to 7) calculates the moving distance of the strip when it is metal, so that the strip moving distance is greater than the distance from the rear stand (F (n + 1)). And a metal in signal is generated for the rear stand F (n + 1). The method of claim 1, wherein the detection method is metal. After detecting the metal in the F3 stand, when the roll gap setting for the F4 to F7 stands is completed, the actual roll force of the stand is stored as the memory roll force, and each stand (F4 to F7) is compared by the roll force comparison. The metal phosphorus detection method further comprises the step of determining whether the metal phosphorus.

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