KR102032612B1 - Apparatus for controlling width in rolling process and method thereof - Google Patents

Abstract

The present invention relates to a width control apparatus and a method in a rolling process, the shape detecting unit for detecting the shape of the inlet slab of the finishing rolling mill including a plurality of rolling stands, and adjusts the tension of the slab between the stand conveyed between the plurality of rolling stands And a width control unit for controlling the width of the exit slab of the finish rolling mill by adjusting the tension of the slab between the stands based on the shape of the entrance slab detected by the shape detection unit. .

Description

Width control device and method in rolling process {APPARATUS FOR CONTROLLING WIDTH IN ROLLING PROCESS AND METHOD THEREOF}

The present invention relates to a width control apparatus and method in a rolling process, and more particularly, to a width control apparatus and method in a rolling process for controlling the width of the slab in the finish rolling process.

General steel manufacturing consists of a steelmaking process to produce molten iron, a steelmaking process to remove impurities from molten iron, a regeneration process to transform liquid iron into a solid, and a rolling process to make iron into steel or wire.

In the rolling process, the slab is charged into a heating furnace, reheated to a temperature suitable for rolling (1100 ~ 1300 ℃), extracted, and then rolled and rolled through a rough mill (RM: Roughing Mill), followed by finishing mill (FM: Finishing). Mill) consists of a series of processes for final rolling into the product with the desired thickness.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 839572 (Jun. 2008).

An object of the present invention is to improve the width of the slab is charged according to the shape of the slab is loaded into the finishing mill in the rolling process to secure the slab width by improving the problem that can not control the exit width of the finishing mill to the target width It is to provide a width control apparatus and method.

The width control device in the rolling process according to an aspect of the present invention is a shape detecting unit for detecting the shape of the inlet slab of the finishing rolling mill including a plurality of rolling stands, the tension of the slabs between the stand conveyed between the plurality of rolling stands And a width controller configured to control the width of the exit slab of the finishing mill by adjusting the tension of the slab between the stands based on the shape of the entrance slab detected by the shape detector. It is characterized by.

In the present invention, the shape detecting unit detects the front shape or the side shape of the entrance slab through a laser sensor.

In the present invention, the width control unit is characterized in that for calculating the cross-sectional area of the shape of the entrance slab, and adjusts the tension of the slab between the stand based on the calculated cross-sectional area and the detected shape.

In the present invention, the width control unit is a method of applying a predetermined width spread compensation coefficient to the detected shape to the ratio of the calculated cross-sectional area and the reference cross-sectional area obtained by the standard shaping operation for the detected shape. It characterized in that to adjust the tension of the slab between the stand.

In the width control method in the rolling process according to the aspect of the present invention, the shape detecting unit detects the shape of the inlet slab of the finishing mill including a plurality of rolling stands, and the width control unit detects the shape of the slab. Controlling the width of the exit slab of the finishing rolling mill by adjusting the tension of the slab between the stands based on the shape of the side slab, the tension adjusting part adjusting the tension of the slab between the stands transferred between the plurality of rolling stands; It is characterized by including.

In the detecting step, the shape detecting unit may detect a front shape or a side shape of the entrance slab through a laser sensor.

In the controlling of the present invention, the width controller calculates a cross-sectional area of the shape of the entrance slab and adjusts the tension of the slab between the stands based on the calculated cross-sectional area and the detected shape. .

In the controlling of the present invention, the width control unit may include a width spreading compensation factor preset for the detected shape at a ratio of the calculated cross-sectional area and a reference cross-sectional area obtained by a standard shaping operation with respect to the detected shape. It characterized in that to adjust the tension of the slab between the stand by using a method.

The present invention can ensure the width of the slab by removing the slab width deviation caused by the difference in the shape of the slab charged into the finishing mill, and can reduce the cost and improve customer satisfaction by improving the quality of the slab have.

1 is an exemplary view for explaining a width control device in a rolling process according to an embodiment of the present invention.
2 is an exemplary view for explaining an installation position of the shape detection unit in the width control device in the rolling process according to an embodiment of the present invention.
3 and 4 are exemplary views for explaining the spread amount of the width varies according to the shape of the slab during the rolling process in the width control apparatus in the rolling process according to an embodiment of the present invention.
5 is an exemplary view for explaining a standard shaping operation of the width control unit in the width control device in the rolling process according to an embodiment of the present invention.
6 is a flowchart illustrating a width control method in a rolling process according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the width control device and method in the rolling process according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is an exemplary view for explaining a width control device in a rolling process according to an embodiment of the present invention, Figure 2 is an installation position of the shape detection unit in the width control device in a rolling process according to an embodiment of the present invention 3 and 4 are exemplary diagrams for explaining the width spreading amount depending on the shape of the slab during the rolling process in the width control apparatus in the rolling process according to an embodiment of the present invention, 5 is an exemplary view for explaining a standard shaping operation of the width control unit in the width control device in the rolling process according to an embodiment of the present invention.

Referring to FIG. 1, a width control apparatus in a rolling process according to an embodiment of the present invention may include a finish rolling mill 100, a shape detecting unit 200, a tension adjusting unit 300, and a width control unit 400. have.

The finish rolling mill 100 includes a plurality of rolling stands. The rolling stand has a plurality of rolling rollers which are in contact with the top and bottom surfaces of the slab, respectively, and is installed on the transport path of the slab, and is provided in a structure arranged in plural in the transport direction of the slab.

The shape detecting unit 200 may detect the shape of the entrance slab of the finishing mill 100 and transmit the shape to the width control unit 400 to be described later. Here, the side slab is defined as meaning the slab charged to the finishing mill (100). As will be described later, in the finishing rolling process, the width of the slab varies according to the shape of the entrance slab, so that the exit width of the finishing mill 100 cannot achieve the target width. Accordingly, the shape detection unit 200 ) Can detect the shape of the mouth slab as a first step to remove the variation in the spread amount according to the shape of the mouth slab.

The shape detecting unit 200 may include a plurality of laser sensors 210, 220, and 230 to detect the shape of the entrance slab, and the front shape or the side shape of the entrance slab based on the direction in which the slab is transferred through the laser sensor. Can be detected. To this end, as shown in FIG. 2, the first laser sensor 210 for detecting the front shape of the slab, and the second laser sensor 220 and the third laser sensor 230 for detecting the left and right side shapes of the slab, respectively, are used. It may include. On the other hand, the first laser sensor 210 may be installed on a predetermined support that can be changed in height for the progress of the slab. In addition, the shape of the entrance slab described below includes the front shape or the side shape of the entrance slab, and for the sake of understanding of the present exemplary embodiment, the shape of the entrance slab means the front shape of the entrance slab.

The tension control unit 300 may be controlled by the width control unit 400 to be described later to adjust the tension of the slab between the stand is transferred between the plurality of rolling stands included in the finishing mill (100). Here, the slab between stands is defined as meaning a slab that is transported between a plurality of rolling stands. The tension adjusting unit 300 may be implemented as a looper that adjusts the tension of the slab in such a manner as to be installed between the plurality of rolling stands to push the slab upwards as shown in FIG. 1.

The width control unit 400 controls the width of the exit slab of the finish rolling mill 100 by adjusting the tension of the slabs between the stands through the tension adjusting unit 300 based on the shape of the entrance slab detected by the shape detection unit 200. can do. Here, the exit slab is defined as meaning the slab output from the finish rolling mill 100.

Based on the above-described configuration, first, the problem in which the spreading amount of the exit slab varies according to the shape of the entrance slab in the finishing rolling process will be described in detail as an example illustrated in FIG. 3.

Referring to FIG. 3, a case in which the thickness rolling is performed in a state where the target thickness is set to 100 mm is described as an example. (Normal state) The slab width spread amount is 35.9mm, and in the case of (b) in which the cross-sectional shape of the entrance slab has a curved side, the slab width spread is 21.2mm, and the cross-sectional shape of the mouth slab is trapezoidal. In the case of the shape (c), the width of the slab is 4.5 mm. The above contents are summarized in Table 1 below.

Section shape Entrance  Slab width (mm) Slab thickness (mm) Draft Exit  Slab width (mm) Width spread (mm) (a) 1200 200 100 1235.9 35.9 (b) 1200 width
Width 1125 200 100 1221.2 21.2 (c) 1200 width
Width 1125 200 100 1204.5 4.5

In more concrete numerical examples, in the case of (a), (b), and (c), the shape of the entrance slab is the width of the exit slab, the cross-sectional area of the shape of the entrance slab, the spread amount of the exit slab, and the entrance slab. When the cross-sectional area of the side shape of is measured as shown in Table 2 below, assuming the case of (a) is 100% in a steady state, the ratio of each of the parameters for (b) and (c) is As described. 4 is a graph showing the relationship between the cross-sectional area of the shape of the entrance slab and the width of the exit slab with respect to the numerical value A and the ratio B. FIG.

Section shape Width of exit slab (mm) Cross-sectional area of the shape of the entrance slab (mm ^ 2) Width spread (mm) Cross-sectional area of the side profile of the entrance slab (mm ^ 2) (a) 1235.9 240000 35.9 30000 (b) 1221.2 233561.9 21.2 23561.9 (c) 1204.5 225000 4.5 15000

ratio Exit  Width ratio of slab Entrance  Ratio of cross-sectional areas of the shape of the slab width Spread  ratio Entrance  Ratio of the cross-sectional area of the lateral shape of the slab (a) / (a) 100% 100% 100% 100% (b) / (a) 98.8% 97.3% 59.1% 78.5% (c) / (a) 97.5% 93.8% 12.5% 50%

Tables 1 to 3 and FIG. 4 indicate that the width of the exiting slab and the cross-sectional area of the shape of the entrance slab are approximately proportional to each other, and the width of the exiting slab is also affected by the shape of the entrance slab. That is, the width ratio of the exit slab may be expressed as the product of the cross-sectional ratio of the shape of the entrance slab and the shape coefficient according to the shape of the entrance slab (for example, 1.015 for (b) and 1.04 for (c)) ( Example: For (b), the width ratio of the axial slab (98.8%) = cross-sectional ratio of the shape of the side slab (97.3%) * shape factor (1.015)).

Therefore, in order to precisely control the width of the exit slab, the tension of the finishing mill 100 should be controlled in consideration of the shape of the entrance slab and its cross-sectional area.

Therefore, in the present embodiment, the width control unit 400 adjusts the tension of the slabs between the stands through the tension adjusting unit 300 based on the shape of the entrance slab detected by the shape detection unit 200. You can control the width of the exit slab.

At this time, the width control unit 400 may calculate the cross-sectional area of the shape of the entrance slab detected by the shape detecting unit 200, and adjust the tension of the slab between the stands based on the calculated cross-sectional area and the detected shape. Stand-by-stand using a method of applying a predetermined width spread compensation factor to the detected shape to the calculated cross-sectional area and the ratio (calculated cross-sectional area / reference cross-sectional area) obtained from the standard shaping operation to the detected shape. You can adjust the tension of the slab.

More specifically, when the shape of the entrance slab is detected by the shape detector 200, the width controller 400 may perform a standard shaping operation on the detected shape. Since the width of the exiting slab to the shape of the standardized (standardized) entrance slab can be easily derived (it can be derived using past operating results, or using a preset algorithm), the width control unit 400 is a standard shaping operation. Through this, the shape detected by the shape detecting unit 200 may be converted into a standard shape, and a cross-sectional area of the converted standard shape, that is, a reference cross-sectional area may be calculated. Referring to the example illustrated in FIG. 5, when the shape detecting unit 200 detects the shape of the entrance slab as shown in (b), the width control unit 400 determines the shape of the entrance slab through (b) standard shaping. It is converted into the shape (a) which is the standard shape, and the cross-sectional area, ie, the reference cross-sectional area, of the converted (a) shape can be calculated.

Thereafter, the width controller 400 may calculate a ratio of the calculated cross-sectional area and the reference cross-sectional area. At this time, as described above, the width of the exit slab is also determined by the shape along with the cross-sectional area of the shape of the entrance slab, so that the width control unit 400 has a width set in advance with respect to the detected shape to the ratio of the calculated cross-sectional area and the reference cross-sectional area. The tension of the slab between the stand can be adjusted by applying spread compensation factor.

Specifically, the cross-sectional area ratio of the shape of the entrance slab and the width ratio of the exit slab do not have a strict proportional relationship, because the shape of the entrance slab also affects the width of the exit slab. to be. Therefore, the width control unit 400 applies a width spread compensation coefficient preset to the shape detected by the shape detecting unit 200 to the ratio of the calculated cross-sectional area and the reference cross-sectional area, and based on the application result, the tension between the slabs between the stands. Can be adjusted. The width spread compensation coefficients may be set in advance so as to correspond to the shape of the entrance slab detected by the shape detector 200, and it is not easy to set the width spread compensation coefficient corresponding to each shape of the entrance slab. In consideration of this, the shape of the entrance slab may be grouped into a plurality of patterns, and the width spreading compensation factor for each group may be preset in the width controller 400.

On the other hand, along with the shape of the side slab and its cross-sectional area, the width controller 400 may also adjust the tension of the slab between the stand in consideration of the applied tension of the finishing mill 100 to the slab and the feeding speed of the slab.

6 is a flowchart illustrating a width control method in a rolling process according to an embodiment of the present invention.

Referring to Figure 6 describes the width control method in the rolling process according to an embodiment of the present invention, first, the shape detection unit 200 detects the shape of the inlet slab of the finish rolling mill 100 including a plurality of rolling stands. (S100). In operation S100, the shape detecting unit 200 may detect a front shape or a side shape of the entrance slab through a laser sensor.

Subsequently, the width control unit 400 adjusts the tension of the slab between the stands through the tension adjusting unit 300 based on the shape of the entrance slab detected by the shape detection unit 200, thereby width of the exit slab of the finishing mill 100. Control (S200).

In step S200, the width control unit 400 calculates the cross-sectional area of the shape of the entrance slab, and adjusts the tension of the slab between the stand based on the calculated cross-sectional area and the detected shape, specifically the calculated cross-sectional area, and the detected shape The tension of the slab between the stands is adjusted by applying a predetermined width spread compensation factor to the detected shape to the ratio of the reference cross-sectional area obtained by the standard shaping operation for.

As such, this embodiment can secure the slab width by removing the slab width variation caused by the difference in the shape of the slab charged into the finishing mill, and reduce the cost and improve the customer satisfaction by improving the quality of the slab. It can be secured.

Although the present invention has been described with reference to the embodiments shown in the drawings, it is merely exemplary and various modifications and equivalent other embodiments are possible to those skilled in the art. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: finishing rolling mill
110: rolling stand
111: rolling roller
200: shape detection unit
210, 220, 230: first to third laser sensors
300: tension control unit
400: width control unit

Claims (8)

A shape detecting unit for detecting a shape of an entrance slab of the finishing rolling mill including a plurality of rolling stands;
A tension adjusting unit for adjusting the tension of the slabs between the stands transferred between the plurality of rolling stands; And
A width controller for controlling the width of the exit slab of the finishing rolling mill by adjusting the tension of the slab between the stands based on the shape of the entrance slab detected by the shape detector;
Including,
The width control unit adjusts the tension of the slab between the stand in consideration of the side shape of the cross-section of the entrance slab,
The width control unit calculates a cross-sectional area of the shape of the mouth-side slab, and adjusts the tension of the slab between the stands based on the calculated cross-sectional area and the detected shape.
The method of claim 1,
And the shape detecting unit detects the front shape or the side surface shape of the entrance slab through a laser sensor.
delete The method of claim 1,
The width control unit uses the stand by using a method of applying a predetermined width spread compensation coefficient to the detected shape to the ratio of the calculated cross-sectional area and the reference cross-sectional area obtained by the standard shaping operation for the detected shape. The width control apparatus in the rolling process characterized by adjusting the tension of the liver slab.
Detecting, by the shape detecting unit, the shape of the inlet slabs of the finishing mill including the plurality of rolling stands; And
Finishing the width control unit by adjusting the tension of the slab between the stand through a tension control unit for adjusting the tension of the slab between the stand conveyed between the plurality of rolling stands, based on the shape of the entrance slab detected by the shape detector. Controlling the width of the exit slab of the rolling mill;
Including,
In the controlling step, the width control unit,
Adjusting the tension of the slab between the stand in consideration of the side shape of the cross section of the mouth slab,
In the controlling step, the width control unit,
And calculating a cross-sectional area of the shape of the side slab and adjusting the tension of the slab between the stands based on the calculated cross-sectional area and the detected shape.
The method of claim 5,
In the detecting step, the shape detection unit,
Width control method in the rolling process characterized by detecting the front shape or side shape of the entrance slab through a laser sensor.
delete The method of claim 5,
In the controlling step, the width control unit,
The tension of the slab between the stands is applied to the calculated cross-sectional area and the ratio of the reference cross-sectional area obtained by the standard shaping operation to the detected shape by applying a preset width spread compensation factor to the detected shape. The width control method in the rolling process characterized by the above-mentioned.

Images