KR20130034354A - Method for controlling width of rolling material - Google Patents

Abstract

PURPOSE: A method for controlling the width of rolled materials is provided to predict the width of final rolled products by measuring the temperature and width of the rolled materials. CONSTITUTION: A method for controlling the width of rolled materials(M) is as follows: The rolled materials are laterally rolled by one or more rolling mills(S100); The width(Wr) and temperature(Tr) of the rolled materials are measured(S200); The width(We) of final rolled products is predicted based on the measured width and temperature of the rolled materials(S300); The amount of rolling mills is controlled based on the predicted width of the final rolled products to make the final rolled products have the predicted width(S400). [Reference numerals] (AA) Start; (BB) Calculating a control amount(Cv) for second width rolling; (CC) No; (DD) We is in a predetermined range?; (EE) Yes; (FF) Finish rolling; (GG) End; (S100) First width rolling; (S200) Measuring the width(Wr) and temperature(Tr) of a rolled material(M) after first width rolling; (S300) Predicting the width(We) of a final rolled product; (S400) Second width rolling;

Description

Width Control Method of Rolled Material {METHOD FOR CONTROLLING WIDTH OF ROLLING MATERIAL}

The present invention relates to a width control method of a rolled material for controlling the width of the rolled material so that the width of the final rolled product in the rolling process to a predetermined desired width, more specifically, the rolled material rolled by the first width rolling The width control method of the rolled material to predict the width of the final rolled product by measuring the width and temperature and to control the amount of rolling in the second width rolling by using the same.

In the hot rolling process HR illustrated in FIG. 1, the rolled material M called 'slab' is first heated to 1,100 ° C. to 1,300 ° C. in a heating furnace (not shown). Then, the rolled material (M) heated in the heating furnace as described above is rolled to a thickness of 30mm to 50mm while passing through the roughing mill (RM1, RM2, RM3, RM4) included in the rough rolling process (R) ' It becomes the rolled material M called a bar '.

As described above, the rolled material M rolled to a predetermined thickness in the rough rolling process R may include the finishing mills FM1, FM2, FM3, which are included in the finishing rolling process F, as shown in FIG. It is rolled to 1.0mm ~ 20.0mm thickness through FM4, FM5, FM6, FM7) to become the final rolled product.

The thickness rolling of the rolled material M is performed in both the rough rolling process R and the finishing rolling process F of the hot rolling process HR as described above and shown in FIG. That is, as described above, the roughing mills RM1, RM2, RM3, RM4 of the rough rolling process R and the finishing mills FM1, FM2, FM3, FM4, FM5, FM6 and FM7 of the finishing rolling process F Thereby rolling the thickness of the rolled material (M).

On the other hand, the width rolling of the rolled material (M) is made only in the rough rolling process (R). For the width rolling of the rolled material M, in the rough rolling process R, a width rolling mill (not shown) called 'sizing press' and a width rolling mill E1 called 'edge' as shown in FIG. E2, E3, E4) are provided.

Width rolling mills E1, E2, E3, and E4, which are referred to as 'edges', are erected in the vertical direction as shown in FIG. 1 and include edge rolls provided on both left and right sides of the moving path of the rolled material M. FIG.

The width rolling mills E1, E2, E3, and E4 referred to as 'edges' in the rough rolling process R shown in FIG. 1 are the first and second rolling mills E1 and 2 before and after the second rough rolling mill RM2, respectively. The width rolling mill E2 is provided, the third width rolling mill E3 is provided before the third rough rolling mill RM3, and the fourth width rolling mill E4 is provided before the fourth rough rolling mill RM4.

With this configuration, the rolled material M is first rolled by a width rolling mill called the above-mentioned 'sizing press'. Then, the width is rolled through the width rolling mill (E1, E2, E3, E4), which is referred to as the above-mentioned 'edge'.

On the other hand, the thickness control of the rolling material (M) is the exit of the finishing rolling process (F), that is, the finishing mill (FM1, FM2, FM3, FM4) during the finishing rolling process (F) by feedback control based on the thickness of the final rolled product. (FM5, FM6, FM7) through the control of the rolling amount. That is, the thickness of the final rolled product is measured with a thickness measuring device (not shown), and then it is compared with the thickness of the desired final rolled product. Then, the thickness of the finishing mills (FM1, FM2, FM3, FM4, FM5, FM6, FM7) in the finishing rolling process (F) is controlled in accordance with the deviation according to the predetermined thickness required for the thickness of the final rolled product. Was made. The thickness control degree of the rolled material M by the thickness control of the rolled material M is controlled very precisely within 50 μm.

On the contrary, the width rolling of the rolled material M is performed only in the rough rolling process R as described above. In the related art, the width control of the rolled material M is performed by the width prediction model. That is, according to the width prediction model, the width rolling amount in each width rolling mill E1, E2, E3, E4 was set, and the width control of the rolling material M was performed.

Width control method of the rolled material (M) by the width prediction model according to the width rolling load distribution, the temperature of the rolling material, the temperature deviation between the heating furnace, the components of the rolled material, the width rolling amount, the thickness rolling amount, the tension Will be different. Therefore, there is a problem that accurate width control of the rolled material M is impossible by the width control method of the rolled material M by the width prediction model. That is, there is a problem that the actual width of the final rolled product by the width control method of the rolled material (M) according to the width prediction model and the width of the desired final rolled product is a big difference.

In order to improve this, as in the thickness control of the above-described rolling material (M), the width control method of the rolling material (M) using the feedback control was used. That is, the width of the final rolled product is measured by a width measuring device (not shown) and then compared with the width of the required final rolled product, and according to the deviation according to the width rolling mill in the rough rolling process (R) ( The width rolling amount of E1, E2, E3, and E4) was controlled.

However, since the width control method of the rolled material M by the feedback control is made only in the rough rolling process (R), there is a problem in that the width of the final rolled product cannot be precisely controlled to the required predetermined width. . That is, even if the width rolling amount of the width rolling mills E1, E2, E3, and E4 is controlled in the rough rolling process R by the feedback control, the width of the rolled material M is reduced while the thickness rolling in the finishing rolling process F is performed. Since it may vary, there is a problem that the width of the final rolled product may not be precisely controlled to the desired width.

The present invention is made by recognizing at least one of the needs or problems occurring in the width control method of the conventional rolled material as described above.

One aspect of the present invention is to measure the width and temperature of the rolled material rolled by the first width rolling to predict the width of the final rolled product.

Another aspect of the object of the present invention is to control the amount of rolling in the second width rolling by using the predicted width of the final rolled product so that the width of the final rolled product is a predetermined desired width.

Another aspect of the object of the present invention is to control the width of the rolled material more precisely.

Another aspect of the object of the present invention is to improve the quality and productivity of the final rolled product.

Width control method of the rolled material according to an embodiment for realizing at least one of the above problems may include the following features.

The present invention basically estimates the width of the final rolled product by measuring the width and temperature of the rolled material rolled by the first width rolling, and then by using this to control the amount of rolling in the second width rolling width of the final rolled product It is based on making this predetermined required width.

Width control method of a rolled material according to an embodiment of the present invention comprises the first width rolling step of width rolling the rolled material by at least one width rolling machine; A measuring step of measuring a width and a temperature of the rolled material rolled in the first width rolling step; A width prediction step of predicting the width of the final rolled product by the width and temperature of the rolled material measured in the measuring step; And width rolling the rolled material while controlling the width rolling amount of the rolled material in at least one width rolling mill based on the width of the final rolled product predicted in the width prediction step so that the width of the final rolled product is a predetermined desired width. A second width rolling step; As shown in FIG.

In this case, the second width rolling step can be executed only when the width of the final rolled product predicted in the width prediction step is out of a predetermined setting range.

In addition, the width We = A + Wr + B of the final rolled product predicted in the width prediction step, where A is a value set according to the type of the rolled material, B is the temperature of the rolled material measured in the measurement step It may be a correction value according to.

And, B = α * (β-Tr), wherein α is a conversion value for converting the temperature difference into a width difference, β may be a reference temperature of the temperature of the rolled material measured in the measuring step.

Further, the control amount Cv = (C-We) * D of the width rolling amount of the rolled material in the second width rolling step, wherein C is a control reference value set according to the type of the rolled material, and D is a width rolling condition. It may be a control rate set according to.

According to the embodiment of the present invention as described above, it is possible to predict the width of the final rolled product by measuring the width and temperature of the rolled material rolled by the first width rolling.

Further, according to an embodiment of the present invention, the width of the rolled material may be controlled by controlling the rolling amount in the second width rolling by using the predicted width of the final rolled product.

In addition, according to the embodiment of the present invention, it is possible to more precisely control the width of the rolled material.

And also, according to the embodiment of the present invention, the quality and productivity of the final rolled product can be improved.

1 is a view schematically showing a hot rolling process including a rough rolling process and a finishing rolling process.
Figure 2 is a flow chart showing an embodiment of the width control method of the rolled material according to the present invention.

In order to help the understanding of the features of the present invention as described above, it will be described in more detail with respect to the width control method of the rolling material according to the embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Accordingly, the present invention may be modified in various ways within the technical scope of the present invention through the embodiments described below, and such modified embodiments fall within the technical scope of the present invention. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

Embodiments related to the present invention basically predict the width of the final rolled product by measuring the width and temperature of the rolled material rolled by the first width rolling and then control the rolling amount of the second width rolling by using the final rolled product It is based on letting the width of be the predetermined desired width.

As shown in FIG. 2, the width control method of the rolled material according to the present invention includes a first width rolling step S100, a measurement step S200, a width prediction step S300, and a second width rolling step S400. It can be configured to include.

In the first width rolling step (S100) it is possible to width-roll the rolled material (M) by at least one width rolling mill (E1, E2).

For example, if the width control method of the rolled material according to the present invention is applied to the hot rolling process HR shown in Fig. 1, the rolled material M is first heated to a predetermined temperature in a heating furnace (not shown). Rolled material (M) heated in the furnace is transferred to the rough rolling process (R). And, the rolling material (M) is rolled through the rough rolling mill included in the rough rolling process (R), in the embodiment shown in Figure 1, passing through the first rough rolling mill (RM1) and the second rough rolling mill (RM2).

As such, the rolling material M, which is rolled through the first rough rolling mill RM1 and the second rough rolling mill RM2, is thickly rolled and provided before and after the second rough rolling mill RM2, respectively, as shown in FIG. The width rolling is also performed while passing through the first width rolling mill E1 and the second width rolling mill E2.

In the above-described embodiment shown in FIG. 1, four width rolling mills E1, E2, E3, and E4 are provided in the rough rolling process R, but the width rolling mill E1 provided in the rough rolling process R is illustrated. The number of E2, E3, and E4 is not limited to four as shown in the illustrated embodiment, and any number of two or more can be used as long as the first width rolling and the second width rolling described above can be performed. .

In addition, in the above-described embodiment, the first rolling mill E1 and the second width of the four width rolling mills E1, E2, E3, and E4 provided in the rough rolling process R in the first width rolling step S100. Although the rolling rolling of the rolled material M is performed by the rolling mill E2 as an example, the number of the width rolling mills provided in the rough rolling process R in which the width rolling is performed in the first width rolling step S100 is not limited thereto. In addition, as long as one or more of the width rolling mills provided in the rough rolling process R, any number is possible.

For example, in the embodiment shown in FIG. 1, in addition to the method described above, in the first width rolling step (S100), width rolling is performed by the first width rolling mill (E1), and the second width rolling step (S400) to be described later. In the second to fourth width rolling mill (E2, E3, E4) may be made by the width rolling, in the first width rolling step (S100) to the first to third width rolling mill (E1, E2, E3) By the width rolling is made, and in the second width rolling step (S400) to be described later may be made by the width rolling by the fourth width rolling mill (E4).

In the measuring step S200, the width Wr and the temperature Tr of the rolled material M that are rolled in the first width rolling step S100 may be measured. To this end, a width measuring device (not shown) and a temperature measuring device (not shown) may be installed after the width rolling mill in which the first width rolling step S100 is performed. For example, in the embodiment shown in FIG. 1, the above-described width measuring device and the temperature measuring device may be installed behind the second width rolling mill E2. By such a width measuring device and a temperature measuring device, it is possible to measure the width (Wr) and the temperature (Tr) of the rolled material (M) rolled in the first width rolling step (S100).

Width rolling mill in which the first width rolling step (S100) is made, the width measuring device and the temperature measuring device installed behind the second width rolling mill (E2) in the embodiment shown in Figure 1 is not particularly limited, the rolling material (M) As long as the width Wr and the temperature Tr can be measured, any known width measuring device or temperature measuring device can be used. For example, the width measuring device may be configured to measure the width of the rolled material M using the image or the temperature measuring device may be configured to measure the temperature of the rolled material M using infrared rays.

In the width prediction step S300, the width Wr and the temperature Tr of the rolled material M measured in the measuring step S200 may predict the width We of the final rolled product. The width Wr of the rolled material M rolled in the first width rolling step S100 and the width We of the final rolled product are correlated. Therefore, this correlation can be known through physical mathematical analysis or repeated experiments.

In addition, since the physical properties of the rolled material M change according to the temperature Tr of the rolled material M, the width of the rolled material M may vary depending on the temperature Tr of the rolled material M. have. Therefore, the temperature (Tr) of the rolled material (M) rolled in the first width rolling step (S100) may be an important variable in predicting the width (We) of the final rolled product.

As can be seen from this, knowing the width (Wr) and the temperature (Tr) of the rolled material (M) rolled in the first width rolling step (S100), it is possible to predict the width (We) of the final rolled product .

The width (We) of the final rolled product predicted in the width prediction step (S300) can be obtained by the following equation.

[Equation 1]

We = A + Wr + B

Here, A is a value set according to the kind of the rolled material (M). For example, in the case of a rolling material (M) of the reference type may have a value of O. In addition, in the case of the rolled material M of the type in which the width rolling is better than the rolled material M of the reference type, the value of A may be greater than O. In addition, in the case of the rolled material (M) of the type that is not made wider width than the rolling material (M) of the reference type may be less than the value of O.

However, the A value is not limited to the above-described example, and even if the type of the rolled material M is different, the difference between the width of the final rolled product and the width We of the final rolled product predicted in the width prediction step S300 is different. Any value can be used.

In addition, B is a correction value according to the temperature (Tr) of the rolled material (M) measured in the measuring step (S200). Even if the same kind of rolling material (M) and the same width rolling conditions, the width rolling amount of the rolling material (M) may vary depending on the temperature (Tr) of the rolling material (M), as described above, the width prediction step ( This should be taken into account when predicting the width of the final rolled product in S300).

This B value can be obtained by the following equation.

&Quot; (2) "

B = α * (β-Tr)

Here, α is a converted value that converts the temperature difference into a width difference. In addition, β is the reference temperature of the temperature (Tr) of the rolled material (M) measured in the measurement step (S200). Such a reference temperature may be, for example, 1050 ° C to 1100 ° C. However, the reference temperature is not limited to the specific temperature and can be arbitrarily set.

For example, when the temperature Tr of the rolled material M measured in the measuring step S200 is a reference temperature, the B value becomes O. That is, since the temperature (Tr) of the rolled material (M) measured in the measuring step (S200) is the reference temperature, when the width prediction step (S300) to predict the width of the final rolled product according to the temperature of the rolling material (M) There is no need to calibrate.

In addition, when the temperature (Tr) of the rolled material (M) measured in the measuring step (S200) is greater than the reference temperature, B value is larger than O. If the temperature (Tr) of the rolled material (M) measured in the measuring step (S200) is greater than the reference temperature, the width rolling amount is larger than the rolling material (M) having a reference temperature.

And, if the temperature (Tr) of the rolled material (M) measured in the measuring step (S200) is less than the reference temperature, B value is smaller than O. If the temperature (Tr) of the rolling material (M) measured in the measuring step (S200) is less than the reference temperature, the width rolling amount is smaller than the rolling material (M) having a reference temperature.

 Therefore, these may be reflected by Equation 2 above when predicting the width of the final rolled product.

In the second width rolling step (S400), based on the width (We) of the final rolled product predicted in the width prediction step (S300) as described above, such that the width of the final rolled product is a predetermined desired width, the first width reduction Rolling material (M) can be width-rolled while controlling the width rolling amount of the rolling material (M) in one or more width rolling mill (E3, E4) different from the softening step (S200). For example, in the embodiment shown in Figure 1 it is possible to width-roll the rolled material (M) while controlling the width rolling amount of the third width rolling mill (E3) and the fourth width rolling mill (E4).

In this way, the width (Wr) and the temperature (Tr) of the rolled roll material (M) rolled in the first width rolling step (S100) is measured, using this to predict the width (We) of the final rolled product, and predict Since the rolling material M is width-rolled while controlling the width rolling amount in the second width rolling step S400 based on the width We of the finished rolled product, the width of the rolled material M is required. It is possible to control the width of the rolled material M quickly so as to be wide. Accordingly, the width of the rolled material M can be controlled more precisely. And, the quality of the final rolled product can be improved, and the productivity can also be improved.

On the other hand, the second width rolling step (S400) can be executed only when the width (We) of the final rolled product predicted in the width prediction step (S300), as shown in the embodiment shown in FIG. That is, the range of the width We of the final rolled product predicted in the width predicting step S300, in which the width of the rolled material M becomes a predetermined desired width, may be set through several or more repeated tests.

For example, the case where the difference between the width We of the final rolled product predicted in the width predicting step S300 and the width of the predetermined required rolled product is within a predetermined range may be set. And, if it is out of this range, it is possible to execute the second step of rolling step (S400) as described above and the embodiment shown in FIG. That is, the width rolling of the rolled material M may be performed by controlling the width rolling amount in the other one or more width rolling mills E3 and E4 so that the width of the final rolled product becomes a predetermined desired width.

In addition, as shown in the embodiment shown in FIG. 2, when the width We of the final rolled product predicted in the width prediction step S300 is within a predetermined setting range, the final width rolling step S400 may not be performed. Since the width of the rolled product becomes a predetermined desired width, the rolled material M can be rolled without finishing the second width rolling step S400.

On the other hand, the control amount (Cv) of the width rolling amount of the rolled material (M) in the second width rolling step (S400) can be obtained by the following equation. This control amount Cv can be, for example, the movement amount of the width rolling mills E3 and E4. In addition, when there are a plurality of width rolling machines width-rolled in the second width rolling step S400, the control amount Cv may vary for each width rolling mill.

&Quot; (3) "

Cv = (C-We) * D

Here, C is a control reference value set according to the type of the rolling material (M). Since the physical properties are different depending on the type of the rolled material M, even if the width We of the final rolled material M predicted in the width prediction step S300 is the same, the control amount depends on the type of the rolled material M. It may vary.

Such a control reference value can be set by several or more repeated experiments. For example, when the width We of the final rolled product predicted in the width predicting step S300 is equal to C, the control amount Cv may be zero. In addition, when the width We of the final rolled product predicted in the width prediction step S300 is smaller or larger than C, the control amount Cv may be larger or smaller than zero. Then, for example, the width rolling mills E3 and E4 can be moved to one side or the other side.

D is a control rate set according to the width rolling conditions. As described above, even if the control amount Cv of the width rolling amount of the rolling material M in the second width rolling step S400 is obtained, the width rolling amount of the rolling material M calculated according to the width rolling conditions is determined. The control amount Cv may be applied as it is, or smaller or larger than this. Such a control rate D can also be set by several or more repeated experiments.

Meanwhile, in the above-described and illustrated embodiment, the width control method of the rolled material according to the present invention is applied to the hot rolling process (HR), but the width control method of the rolled material according to the present invention is not only the hot rolling process (HR). In addition, any process can be applied as long as the width rolling of the rolled material is performed, such as a cold rolling process.

As described above, according to the embodiment of the present invention, the width and temperature of the rolled material rolled by the first width rolling can be measured to predict the width of the final rolled product. 2 It is possible to control the width of the rolled material by controlling the amount of rolling in the width rolling, to control the width of the rolled material more precisely, the quality and productivity of the final rolled product can be improved.

Width rolling control method of the rolled material described above is not limited to the configuration of the above-described embodiment, the embodiments are all or part of each embodiment may be selectively combined so that various modifications can be made It may be configured.

HR: hot rolling process R: rough rolling process
RM1, RM2, RM3, RM4: Roughing mill F: Finishing rolling process
FM1, FM2, FM3, FM4, FM5, FM6, FM7: Finishing mill M: Rolled material
E1, E2, E3, E4: Width Rolling Mill

Claims (5)

A first width rolling step (S100) of width rolling the rolled material (M) by at least one width rolling mill (E1, E2);
A measurement step (S200) of measuring a width (Wr) and a temperature (Tr) of the rolled material (M) rolled in the first width rolling step (S100);
A width prediction step (S300) of predicting the width (W) of the final rolled product by the width (Wr) and the temperature (Tr) of the rolled material (M) measured in the measuring step (S200); And
Rolled material in one or more width rolling mills E3 and E4 based on the width We of the final rolled product predicted in the width prediction step S300 such that the width of the final rolled product is a predetermined desired width. A second width rolling step S400 of width rolling the rolled material M while controlling the width rolling amount of M);
Width control method of the rolled material comprising a. The rolling process of claim 1, wherein the second width rolling step S400 is performed only when the width We of the final rolled product predicted in the width prediction step S300 is out of a predetermined setting range. How to control the width of the material. The method of claim 1, wherein the width We = A + Wr + B of the final rolled product predicted in the width prediction step (S300), where A is a value set according to the type of the rolled material (M), B is Width control method of the rolled material, characterized in that the correction value according to the temperature (Tr) of the rolled material (M) measured in the measuring step (S200). The method according to claim 3, wherein B = α * (β-Tr), wherein α is a converted value for converting a temperature difference into a width difference, and β is a rolled material M measured in the measuring step S200. Width control method of the rolled material, characterized in that the reference temperature of the temperature (Tr). The method according to claim 1, wherein the control amount Cv = (C-We) * D of the width rolling amount of the rolling material M in the second width rolling step S400, wherein C is a kind of the rolling material M. The control reference value is set according to the width control method of the rolled material, characterized in that D is a control rate set according to the width rolling conditions.

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