KR100887863B1 - Control System Device of Warping in Matter for Rolling Mill for controling of the same - Google Patents

Abstract

 The present invention is a control system device for controlling the warping phenomenon of the rolled material, in order to solve the problem that the warping phenomenon is raised up or down when the rolling material passes through the rolling mill, by a main controller controlled in a specific manner By spraying oil exclusively on the upper and lower rolling rolls, the warping phenomenon is controlled by varying the coefficient of friction between the rolled material and each rolling roll.

Rolled Material, Rolling Mill, Warping, Control

Description

Warping control system device for rolling materials and control method thereof {Control System Device of Warping in Matter for Rolling Mill for controling of the same}

1A and 1B are explanatory views illustrating warping phenomenon of a general rolled material.

2 is a conceptual diagram of a warping control system device of a rolled material according to an embodiment of the present invention.

Figure 3 is a block diagram of a warping control system device of a rolled material according to an embodiment of the present invention.

Figure 4 is a flow chart for the control method of the warping control system device of a rolled material according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: rolling mill 110: upper rolling roll

120: lower rolling rolls 124, 125: lubrication device

130: table roller 200: rolled material

310: main controller 320: oil controller

331: upper oil spray nozzle 332: lower oil spray nozzle

350: Roller rotation speed measuring sensor 355: HMD

361: upper thermometer 362: lower thermometer

The present invention relates to a control system device for preventing warping of a rolled material during the rolling process and a control method thereof.

In using a hot rolling mill to make a rolled material into a coil of a desired thickness, the rolled roll is rolled in contact with a hot rolled material (strip). At this time, since the rolled material has a different thickness, a change factor of a pass line occurs every time.

In addition, after the rolling material is heated in the heating furnace, the rolling process is continuously performed, and thus the degree of cooling of the upper and lower parts of the material may be different because the rolling process is carried out. Therefore, when the rolled material is subjected to plastic deformation after entering the rolling mill, the upper and lower parts are deformed differently, and thus asymmetry of the material may occur. In addition, the asymmetry of the rolled material may also be caused by the upper and lower cooling unevenness of the rolling roll when rolling the rolled material.

Especially in the case of high-strength rolled material, these factors at the leading end and the trailing end can cause a large up and down of the rolled material (warping phenomenon). 1A and 1B illustrate a state in which the rolled material 3 is upward and downward, respectively. 1 and 2 are rolling rolls, respectively.

In addition, when the rolled material is inserted into the rolling mill downstream, it acts as a factor that prevents it from entering smoothly, causing abnormal operation or emergency stop of the equipment has a great impact on the productivity decrease.

On the other hand, as a way to solve this problem, Korean Patent Publication No. 10-1996-0021211 predicts in advance how much up and down will occur from the material information and rolling information of the rolled material, and the amount of the upper and lower parts of the rolling mill The technique for controlling the up and down of a plate after rolling by controlling the upper and lower speeds of the rolling mill differently in advance in terms of the change in the roll speed is disclosed.

However, in this case, since the rolled material is in the upper roll and the lower roll, even if a different circumferential speed is applied to each roll, it is difficult to prevent the warping phenomenon.

The present invention has been made to solve the above problems, an object of the present invention is to adjust the friction coefficient through the lubrication of the rolling roll and the rolling material in the rolling process to remove the asymmetry inducing factor of the upper and lower parts to bend the rolled material The present invention provides a control system device and a control method thereof for preventing the same.

Control system device for controlling the warping phenomenon of the rolled material according to an embodiment of the present invention is the thickness of the rolled material, the height of the pass line (distance from the roller table to the middle of the gap between the upper roll and the lower roll), The thickness after rolling and the temperature of the upper and lower parts at the entrance side of the rolling mill are inputted.

A main controller for selecting the spray nozzle and setting the spraying time according to the control unit;

(At this time, t (s) is the oil nozzle injection time, and the injection nozzle is determined by the sign of t. If t> 0, the upper oil nozzle is injected, and if t <0, the lower oil nozzle is injected.

ΔT (° C.) represents the upper and lower temperature differences, and T _ave (° C) represents the upper and lower temperature averages, ΔH (° C) represents the upper and lower temperature averages (0.5 * (T _top -T _bottom )), and ΔHp (mm) represents the height difference (Hp) between the pass line and the material center. -0.5H), Hp (mm) is the height of the pass line, H (mm) is the thickness of the rolled material, ΔH (mm) is the rolling amount (Hh), h is the thickness of the material after rolling, α, β, γ Is the model tuning coefficient, and K (1 / s) is the warp tuning coefficient.)

An oil controller for controlling oil injection according to the injection nozzle and the injection time signal from the main controller;

Upper and lower oil spray nozzles selected exclusively from each other according to the signal of the oil controller, for spraying oil to the rolled material for a predetermined time;

Located at the rear end of the rolling mill, it comprises a camera, characterized in that it comprises a warp (Warp) detection sensor for measuring the vertical direction of the rolled material and feeds it back to the main controller.

It is preferable to further include a position sensor for transmitting the position information of the rolled material to the main controller to determine the injection time of the oil spray nozzle.

In addition, the position sensor preferably includes a rotational speed measuring sensor of the table roller attached to the drive motor for transporting the rolled material, and HMD (Hot Metal Detector) installed for each moving section of the rolled material.

In addition, another aspect of the present invention, a method for controlling a warping control system device of a rolled material, comprising the steps of: tracking the position information of the rolled material for the rolled material in the position sensor; The nozzle injection time point is selected as the signal information obtained in the rolling material position measuring step, and the upper and lower nozzles are controlled by the main controller using the thickness of the rolled material, the height of the pass line, the amount of rolling (thickness), and the upper and lower temperatures of the upper and lower sides of the rolling mill. Selecting a spray nozzle and time; Spraying the actual oil by controlling the selected nozzle by the oil controller according to the injection time, the injection nozzle and the injection time commanded from the main controller; And it may be configured to include the step of measuring the warp state of the rolled material passed through the rolling mill with a warping detection sensor to enter the main controller.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 2 is a conceptual diagram of a warping control system device for a rolled material according to an embodiment of the present invention, Figure 3 is a block diagram of a warping control system device for a rolled material according to an embodiment of the present invention.

First, the rolling mill to which the warping control system device is applied will be briefly described. The rolling mill 100 includes the upper rolling roll 110, the lower rolling roll 120, and the table roller 130. At this time, the rolled material 200 is rolled through the upper rolling roll 120 and the lower rolling roll 130, the rolled material 200 is moved by the rotation of the table roller 130. In this figure, the rolling mill is composed of a pair of rollers for ease of description, but it will be appreciated by those skilled in the art.

At this time, one side around the rolling mill 100 is provided with lubrication devices (124, 125) for applying a lubricant to the upper and lower rolling rolls, respectively. By constantly applying a lubricant to the rolling rolls, a rolled material of good quality can be obtained.

Warping control system apparatus for a rolled material according to an embodiment of the present invention is provided in the above-described rolling mill. The warping control system of the rolled material 200 includes a main controller 310, an oil controller 320, upper and lower oil spray nozzles 331 and 332, warp detection sensors 340, and various sensors 350 and 355. , 361, 362.

The main controller 310 receives signals from various sensors and inputs, predicts oil injection time and injection nozzles, and transmits signals to the corresponding oil injection nozzles. In this embodiment, the amount of oil injected per unit time is set to a constant, but is not limited thereto.

At this time, the information transmitted to the main controller 310 is configured in various ways. The information input to select the injection nozzle and the injection time, the thickness of the rolled material, the height of the pass line (distance from the roller table to the intermediate point between the upper roll and the lower roll), the thickness after rolling of the rolled material 200 And upper and lower temperatures at the inlet side of the rolling mill. The upper and lower temperatures at the entrance side of the rolling mill 100 are measured by the upper and lower thermometers 361 and 362.

In addition, the information measured for the injection timing of the injection nozzles (331, 332) is a table roller rotational speed, the position of the rolled material and the like. At this time, the rotational speed of the table roller is applied from the roller rotational speed measuring sensor 350 attached to the drive motor for transporting the rolled material, the position of the rolled material 200 is HMD installed for each moving section of the rolled material 200 (Hot Metal Detector; 355). The HMD 355 is a device that is turned on or off when an object above a predetermined temperature is measured.

The oil injection time predicted in the main controller 310 and the nozzle are represented by the following equation (1). Equation 1 is a dimensionless phase and downward temperature difference of the rolling material 200 measured at the entrance of the rolling mill 100 to the average temperature, the difference between the material thickness and the pass line height as the material thickness, the material rolling amount to the material thickness Each was formed as a combination of non-dimensionalized variables.

At this time, t (s) is the oil nozzle injection time, the injection nozzle is determined by the sign of t, if t> 0, the upper oil nozzle is injected, if t <0, the lower oil nozzle is injected.

ΔT (° C) represents the upper and lower temperature differences, T _ave (° C) represents the upper and lower temperature averages, and ΔHp (mm) represents the height difference between the pass line and the material center (Hp-0.5H) and Hp (mm) The height of the pass line, H (mm) is the thickness of the material, ΔH (mm) is the rolling amount (Hh), h is the thickness of the material after rolling, α, β, γ is the model tuning coefficient, K (1 / s) represents the warp tuning coefficient.

The oil controller 320 receives the signal for the injection time and the injection nozzle from the main controller 310 to control the oil injection nozzles 331 and 332 of the upper and lower parts.

Upper and lower oil spray nozzles 331 and 332 are provided to adjust friction coefficients of the upper rolling roll 110 and the lower rolling roll 120, respectively. That is, when the top of the rolled material 200 is expected to be upward, the upper oil spray nozzle 331 on the upper rolling roll 110 is opened to spray oil on the upper rolling roll 110, and the lower rolling roll side ( Block the lower oil spray nozzle 125 in 120). In addition, when the downward direction of the tip of the rolled material 200 is expected, the lower oil spray nozzle 332 on the lower rolling roll 120 side is opened and the upper oil spray nozzle 331 on the upper rolling roll 110 side. To block. As a result, the friction coefficient between the rolling roll and the rolled material may be differently applied to the upper and lower rolling rolls 110 and 120 to prevent warping of the rolled material.

The warp detection sensor 340 is located at the rear end of the rolling mill, and includes a camera to measure the vertical direction of the rolled material and feed it back to the main controller 310. The main controller 310 is a value input from the warp detection sensor 340 afterwards, and corrects an error, improves precision by learning K in the equation of the injection prediction model, and increases the up and down values at the next rolling mill pass. Improve.

Next, a control method of a warping control system apparatus for a rolled material according to an embodiment of the present invention will be described with reference to FIG. 4. According to this, the warping control system device is composed of a device including a rolling material position tracking step, setting the oil spray nozzle and time, spraying oil, and feeding back the oil spraying results.

First, the rolling material information tracking step is a step of tracking the position information of the rolling material for the rolled material in various sensors (ST100).

Position information is applied to the moving speed of the rolled material from the roller rotational speed sensor attached to the drive motor for transporting the rolled material, the position of the rolled material is applied from the HMD (Hot Metal Detector) installed for each moving section of the rolled material.

Next, the step of setting the oil spray nozzle and time is to select the nozzle spraying time point with the signal information obtained in the rolling material position measurement step, the information input for the rolled material, that is, the thickness of the rolled material (H), the pass line Based on the height (distance from the roller table to the middle point between the upper and lower rolls; Hp), the thickness after rolling of the rolled material (h), and the upper and lower temperatures at the inlet side of the rolling mill, This step is to select injection nozzle and time of upper and lower nozzle. (ST200)

Next, the step of injecting oil is a step of injecting the actual oil by controlling the nozzle by the oil controller according to the injection nozzle and time commanded from the main controller. (ST300)

The step of feeding back the whip measurement result is a step in which the warp detection sensor measures the warp state of the rolled material and inputs it into the main controller, which receives the input and learns K in the equation of the injection prediction model.

Although the present invention has been described primarily with reference to the above embodiments, many other possible modifications and variations can be made without departing from the spirit and scope of the invention. For example, the number, position, and shape of the upper and lower oil spray nozzles may be changed.

The warp control system apparatus of the rolled material according to the present invention has an effect of reducing the occurrence of wear and energy consumption of the surface of the rolled roll according to the change of the relative speed of the rolled material by varying the oil spray on the upper and lower rolling rolls. In addition, by responding to the occurrence of the top and bottom of the rolled material according to the rolling conditions and material conditions, there is an effect that productivity does not increase because no operation stop occurs in the subsequent process.

The scope of the above-described invention is defined in the following claims, and is not bound by the description in the text of the specification, all modifications and variations belonging to the equivalent scope of the claims will fall within the scope of the present invention.

Claims (4)

As a control system device that controls the warping phenomenon of rolled materials, A main controller that receives the thickness of the rolled material, the height of the pass line, the thickness after rolling of the rolled material, and the upper and lower temperatures at the inlet of the rolling mill, and selects the spray nozzle and sets the spraying time according to Equation 1 below; (Equation 1)

(At this time, t (s) is the oil nozzle injection time, and the injection nozzle is determined by the sign of t. If t> 0, the upper oil nozzle is injected, and if t <0, the lower oil nozzle is injected. ΔT (° C) represents the upper and lower temperature differences, T _ave (° C) represents the upper and lower temperature averages, and ΔHp (mm) represents the height difference between the pass line and the material center (Hp-0.5H) and Hp (mm) The height of the pass line, H (mm) is the thickness of the rolled material, ΔH (mm) is the rolling amount (Hh), h is the thickness of the material after rolling, α, β, γ is the model tuning coefficient, K ( 1 / s) is a warp tuning coefficient.) An oil controller for controlling oil injection according to the injection nozzle and the injection time signal from the main controller; An upper and lower oil spray nozzles selected exclusively from each other according to a signal of the oil controller and spraying oil on the rolled material for a predetermined time; And Located in the rear end of the rolling mill, a warping control system device for a rolled material comprising a warp (Warp) detection sensor that includes a camera to measure the vertical direction of the rolled material and feeds it back to the main controller. The method of claim 1, Rolling material warping control system device further comprising a position sensor for transmitting the position information of the rolled material to the main controller to determine the injection time of the oil spray nozzle. The method of claim 2, The position sensor is a warping control system device of a rolled material, characterized in that it comprises a rotational speed measuring sensor of the table roller attached to the drive motor for transporting the rolled material, HMD (Hot Metal Detector) installed for each moving section of the rolled material . As a control method of the warping control system apparatus of the rolled material of claim 1, Tricking position information on the rolled material in the position sensor; The nozzle injection time point is selected by the signal information obtained in the rolling material position measuring step, and the upper and lower nozzles are controlled by the main controller using the thickness of the rolled material, the height of the pass line, the amount of rolling (thickness), and the upper and lower temperatures of the upper and lower sides of the rolling mill. Selecting a spray nozzle and time; Spraying the actual oil by controlling the selected nozzle by the oil controller according to the injection time, the injection nozzle and the injection time commanded from the main controller; And A method of controlling a warping control system device for a rolled material comprising measuring the warp state of the rolled material passing through the rolling mill with a warping detection sensor and inputting it as a main controller.

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