RU2786648C1 - Device for controlling profiled billet rolling in the rolling stand of a plate mill with a hydraulic pressure device - Google Patents

Abstract

FIELD: rolling production.

SUBSTANCE: invention relates to the field of rolling production and can be used in automatic control systems for rolling a sheet from a slab billet at thick plate rolling mills. The device automatically switches the parameter controlled by the channel of hydraulic pressure devices (HPD), depending on the rolling mode, in one of which the rolling of the front end, the middle section and the rear end of the rolled sheet is carried out with specified constant reductions in the automatic thickness control mode. In another mode, the rolling of the profiled sections of the rolled sheet is carried out with variable compression in the mode of automatic control of the HPD position. To do this, the device is equipped, among other things, with three controlled keys, a thickness controller, a HPD displacement intensity setting device, a logic unit, a gauge for the output thickness of the rolled billet, a HPD position setting unit, and a block for setting the parameters of profiled billet rolling.

EFFECT: use of the invention improves the reliability of the device and the quality of rolled products.

1 cl, 3 dwg

Description

The invention relates to the field of rolling production and can be used in automatic control systems for rolling a sheet from a slab billet at thick plate rolling mills.

A device for adjusting the dimensions of the ends of hot-rolled strips is known, including a block for setting the movement of pressure screws, a control system for moving the pressure screws of the stand, keys, a metal presence sensor, a computing unit, a coefficient setting unit, a stand roll speed meter, an adder, an adjustable delay unit, a stand roll speed controller , a block for setting the coefficients, a computing unit and a key (see A.S. No. 1013010, IPC V21V 37/06).

The disadvantage of the known device is the limitation of its use for the formation of complex profiles of the end sections of the rolled products, which are necessary when introducing the technology of profiled rolling of a slab billet on thick plate rolling mills, which leads to additional losses of metal with side and end trim.

The closest analogue to the claimed device is a device for controlling profiled rolling of a workpiece in a rolling stand of a plate mill with a hydraulic pressure device (HPU), containing a HPU position controller, a HPU position sensor, a HPU force sensor, a block for setting the thickness of a rolled workpiece, a block for calculating the length of a rolled workpiece , a sensor for the presence of a workpiece in the stand and a pulse sensor, while the output of the HLS position controller is configured to be connected to the input of the HLS, the pulse sensor is configured to be mechanically connected to one of the rolling rolls, the first input of the unit for calculating the length of the rolled workpiece is connected to the output, and the second the input of the specified length calculation unit is connected to the output of the workpiece presence sensor in the stand, the input of which is connected to the output of the HLS force sensor, and the output of the specified length calculation unit is connected to the first input of the block for setting the thickness of the rolled workpiece, the second input of which is connected to the output workpiece presence sensor in the stand (see RF patent for utility model No. 117329, IPC B21 B37/16).

The disadvantage of the known device is the limited scope. The device is intended only for correction of the thickness of the head (front) section of the strip in the finishing group stand of a continuous wide-strip hot rolling mill.

The second drawback is due to the fact that in the known device, the regulation of the thickness of the main part of the strip and the correction of the thickness of the head section are carried out by one block of indirect control, which ensures the movement of the hydraulic pressure device, since the simultaneous supply of two signals (thickness control and regulation of the position of the hydraulic pressure device) to one the regulator causes it to malfunction. This can lead to the occurrence of unacceptable forces in the hydraulic cylinders, which increases the risk of accidents and reduces the reliability of the device.

In addition, superposition of two control signals reduces the accuracy of thickness control in the sections with an adjustable profile, which deteriorates the quality of the product.

The technical problem to be solved by the claimed invention is the creation of a device that ensures the production of high-quality finished products by observing the geometric shape, increasing the reliability of the device, reducing metal losses from the side and end trim.

The technical result is achieved by expanding the scope of the proposed device by providing the ability to control the profiled rolling of slab billets on a thick plate rolling mill by adjusting the thickness along the entire length of the rolled product without the risk of accidents and reducing

reliability of the device.

In the claimed device, automatic switching of the parameter controlled by the channel of hydraulic pressure devices is carried out, depending on the rolling mode. In the first mode, the rolling of the front end, the middle section and the rear end of the rolled sheet is carried out with given constant reductions in the mode of automatic thickness control. In the second mode, the rolling of the profiled sections of the rolled sheet is carried out with variable compression in the mode of automatic control of the position of the hydraulic pressure device.

The technical result is achieved by the fact that in a device for controlling the profiled rolling of a workpiece in a rolling stand of a thick plate mill with a hydraulic pressure device (HLD), containing a HHL position controller, a HHL position sensor, a HHL force sensor, a block for setting the thickness of a rolled workpiece, a block for calculating the length of a rolled workpiece , a sensor for the presence of a workpiece in the stand and a pulse sensor, while the output of the HLS position controller is configured to be connected to the input of the HLS, the pulse sensor is configured to be mechanically connected to one of the rolling rolls, the first input of the unit for calculating the length of the rolled workpiece is connected to the output of the pulse sensor, and the second input of the specified length calculation unit is connected to the output of the workpiece presence sensor in the stand, the input of which is connected to the output of the HLS force sensor, and the output of the specified length calculation unit is connected to the first input of the block for setting the thickness of the rolled workpiece, the second input of which is connected to the output the house of the sensor for the presence of the workpiece in the stand, according to the invention, it is equipped with the first and second summing elements, the first, second and third controlled keys, the thickness controller of the rolled workpiece, the intensity setting of the movement of the HDL, a logic unit, the output thickness sensor of the rolled workpiece, the block for setting the position of the HDL and a block for setting the parameters of profiled billet rolling, wherein the output of the first summing element is connected to the first input of the HLS position controller, the first input of the first summing element is connected to the output of the third controlled key, the first input of which is connected to the output of the HLS position sensor, the second input of the first summing element is connected to the output of said thickness controller, and its third input is connected to the output of the block for setting the position of the HPU, the input of which is connected to the output of the intensity gauge of the movement of the HPU, the first input of which is connected through the first controlled key to the output of the said block for setting the thickness, at than the first input of the logic block is connected to the output of the sensor for the presence of a workpiece in the stand, and its second input is connected to the output of the said length calculation block, the first output of the logic block is connected to the control inputs of the first and third controlled keys, and the second output of the logic block is connected to the control input of the second controlled key, wherein the input of said thickness controller is connected through the second controlled key to the output of the second summing element, the first input of which is connected to the output of the output thickness sensor of the rolled workpiece, and the second input is connected to the output of the said thickness setting unit, the first output of the said parameter setting unit connected to the second input of the HLT position controller, the second output - to the third input of the logic block, the third output - to the third input of the unit for setting the thickness of the rolled workpiece, and the fourth output - to the second input of the HL displacement rate generator.

The essence of the invention is illustrated by drawings, where:

- figure 1 shows a functional diagram of the proposed device for controlling the profiled rolling of the workpiece in the rolling stand;

- figure 2 schematically shows sections of constant and variable thickness along the length of the workpiece during profiled rolling;

- figure 3 shows a longitudinal section of the workpiece (a) and a diagram of changes in thickness (b), illustrating the principle of a point setting of the profile along the length of the rolled product.

The inventive device (figure 1) to control the profiled rolling of the workpiece in the rolling stand 1 plate mill, equipped with a GNU 2, contains a position controller GNU 3 and position sensor GNU 4. In addition, the control device contains a force sensor GNU 5, a unit for setting the thickness of the rolled workpiece 6, a block for calculating the length of a rolled billet 7, a sensor for the presence of a billet in the stand 8 and a pulse sensor 9.

The output of the HPU 3 position controller is configured to be connected to the input of the HPU 2. The pulse sensor 9 is configured to be mechanically connected to one of the rolling rolls. The first input of the block for calculating the length of the rolled workpiece 7 is connected to the output of the pulse sensor 9. The second input of the specified block for calculating the length of the rolled workpiece 7 is connected to the output of the sensor for the presence of the workpiece in the stand 8, the input of which is connected to the output of the HLS force sensor 5. The output of the specified block for calculating the length of the rolled workpiece 7 is connected to the first input of the block for setting the thickness of the rolled workpiece 6, the second input of which is connected to the output of the sensor for the presence of the length of the rolled workpiece in the stand 8.

In the control device (figure 1) profiled rolling of the workpiece in the rolling stand 1 plate mill additionally introduced the first 10 and second 11 summing elements, the first 12, second 13 and third 14 managed keys. In addition, the device includes a rolled billet thickness controller 15, a displacement intensity adjuster for a HLC 16, a logic unit 17, a gauge for the output thickness of a rolled billet 18, a HLC position setting unit 19, and a billet profiled rolling parameters setting unit 20.

At the same time, the output of the first summing element 10 is connected to the input of the HLS position controller 3, and the first input of the first summing element 10 is connected to the output of the third controlled key 14, the first input of which is connected to the output of the HLS position sensor 4. The second input of the first summing element 10 is connected to the output the said thickness controller 15, the third input - with the output of the block for setting the position of the HPU 19. The input of the latter is connected to the output of the displacement intensity generator of the HPU 16, the first input of which is connected through the first controlled key 12 to the output of the mentioned block for setting the thickness of the rolled workpiece 6.

The first input of the logic block 17 is connected to the output of the sensor for the presence of a workpiece in the stand 8, and the second input is connected to the output of the said block for calculating the length of the rolled workpiece 7. The first output of the logic block 17 is connected to the control inputs of the first 12 and third 14 controlled keys, and the second output of the logic block 17 is connected to the control input of the second 13 managed key. The input of said thickness controller 15 is connected through the second controlled key 13 to the output of the second summing element 11, the first input of which is connected to the output of the gauge of the output thickness of the rolled workpiece 18, and the second - to the block for setting the thickness of the rolled workpiece 6. The first output of the block for setting the parameters of profiled rolling 20 connected to the second input of the position controller GNU 3, the second output - to the third input of the logic block 17, the third output - to the third input of the unit for setting the thickness of the rolled workpiece 6, and the fourth output - to the second input of the displacement rate generator GNU 16.

- длины участков на переднем и заднем концах заготовки, прокатываемых с постоянным обжатием;

- длины профилируемых участков;

- длина среднего участка, прокатываемого с постоянным обжатием;

- толщина концевых участков профилированного проката;

- толщина среднего участка.Figure 2 marked:

- the length of the sections at the front and rear ends of the workpiece, rolled with constant reduction;

- lengths of profiled sections;

- the length of the middle section, rolled with constant compression;

- thickness of the end sections of profiled rolled products;

- the thickness of the middle section.

Figure 3a shows a longitudinal section of the workpiece, explaining the principle of generating a signal at the output of the unit for setting the thickness of the rolled workpiece 6.

(фиг.2) сформированные сигналы на выходе блока 6 также имеют вид «ступенек», которые в очередной опорной точке k (фиг.3,б) скачком увеличиваются на Δh _k . На фиг.3,б на длине участка l _{n 2} внутри круга в увеличенном масштабе показаны расстояния Δl _k , Δl _{k +1} и изменение толщины Δh _k «ступенька».Figure 3b shows a diagram of setting the thickness h as a function of length l formed at the output of block 6. On the length of the section h _{n 1} inside the circle, the distances Δ l _i , Δ l _{i +1} and the change in thickness Δ h _i are shown on an enlarged scale "step". On the length of the section

(figure 2) generated signals at the output of block 6 also have the form of "steps", which in the next reference point k (figure 3,b) jump increases by Δ h _k . In Fig.3b on the length of the plot l _{n 2} inside the circle on an enlarged scale shows the distance Δ l _k , Δ l _{k +1} and the change in thickness Δ h _k "step".

The block for setting the thickness of the rolled billet 6 can be implemented programmatically in the structure of the control controllers of the stand of the plate mill (see Petrov I.V. Programmable controllers. Standard languages and methods of applied design. - M.: Solon-Press, 2008 - 256 p.) . The remaining elements that make up the device under consideration are blocks that are well-known in the field of electrical engineering, which can be performed using elements of an analog block system of regulators (see Perelmuter V.M., Sidorenko V.A. Control systems for DC thyristor electric drives. - M.: Energoatomizdat, 1988 - S. 126-142) or in a hardware-software way in the structure of control controllers.

Distinctive features of the proposed technical solution are:

1. Additional inclusion of the first 12, second 13 and third 14 controlled keys, the control inputs of which are connected to the outputs of the logic block 17, the inputs of which are connected to the output of the sensor for the presence of the workpiece in the stand 8 and the output of the block for calculating the length of the rolled workpiece 7.

2. Additional activation of the rolled workpiece thickness controller 15, the input of which is connected through the second controlled key 13 to the output of the second summing element 11, the first input of which is connected to the output of the output thickness sensor of the rolled workpiece 18, and the second - to the block for setting the thickness of the rolled workpiece 6.

3. Additional inclusion of the first summing element 10, the first input of which, through the third controlled key 14, is connected to the output of the position sensor of the GNU 4, the second input of the first summing element 10 is connected to the output of the thickness controller 15, the third input is connected to the output of the block for setting the position of the GNU 19, the input which, through the series-connected setting of the intensity of movement of the HPU 16 and the first controlled key 12, is connected to the output of the block for setting the thickness of the rolled workpiece 6, while the output of the first summing element 10 is connected to the input of the position controller of the HLS 3.

4. Formation of the output signal from the block for setting the thickness of the rolled billet 6, which displays the shape of the longitudinal section during profiled rolling (Fig.3, a), the connection of the first input of the block 6 with the output of the block for calculating the length of the rolled product 7, and the second with the output of the sensor for the presence of the workpiece in the stand eight.

(фиг.2) на переднем и заднем концах проката и среднего участка длиной

осуществляется с заданными постоянными обжатиями в режиме автоматического регулирования толщины. Прокатка профилируемых участков

осуществляется с переменным обжатием в режиме автоматического регулирования положения ГНУ.In the inventive device, the first distinguishing feature provides automatic switching of the parameter controlled by the HPU channel, depending on the rolling mode. Section rolling

(figure 2) at the front and rear ends of the rental and the middle section of the length

is carried out with the given constant reductions in the mode of automatic thickness control. Rolling profiled sections

is carried out with variable compression in the mode of automatic control of the position of the HPU.

и

, прокатываемых с постоянной заданной толщиной. По сравнению с известным устройством, это обеспечивает повышение точности регулирования толщины, а следовательно, получения заданных геометрических параметров готовой продукции.According to the second distinguishing feature, the inclusion of additional elements ensures closed regulation of the thickness of rolled products in sections

and

rolled with a constant specified thickness. Compared with the known device, this provides an increase in the accuracy of thickness control, and consequently, obtaining the specified geometric parameters of the finished product.

. Использование замкнутого регулирования положения ГНУ для формирования профиля переменной толщины по длине проката в известных технических решениях не встречается.According to the third distinctive feature, an increase in the accuracy of regulating the position of the hydraulic pressure device 2 is provided when rolling sections of variable thickness

. The use of closed control of the position of the HPU for the formation of a profile of variable thickness along the length of the rolled products is not found in known technical solutions.

The fourth distinguishing feature provides the relationship of the task signal for the movement of the HPU with the length of the sections rolled with different reductions. A similar operation is used in the device taken as a prototype. However, in the known solution, this operation is used only to correct the thickness of the head (front) section of the strip and is not intended to generate a command signal for an adjustable thickness along the entire length of the rolled product, therefore, it is unacceptable for controlling the profiled rolling of a slab billet on a plate mill. In the claimed technical solution, the above operation is carried out to form the section shown in Fig.2, which makes it possible to control profiled rolling.

In general, the distinguishing features provide the use of the proposed device for controlling the profiled rolling of a slab billet on a plate mill and provide an increase in the accuracy of thickness control along the entire length of the rolled product.

Let us describe the purpose and principle of operation of the individual blocks of the proposed device for controlling the profiled rolling of the billet in the rolling stand of a plate mill with HPU (figure 1).

Block 7 on the signal from the output of the sensor for the presence of the workpiece in the stand 8 (when the workpiece enters the rolls) generates a signal that corresponds to the current length l of the rolled sheet. The calculation of the current length l of the sheet is carried out by counting the pulses coming from the output of the pulse sensor 9, mechanically connected to one of the rolls of the rolling stand 1.

, а его постоянная толщина равна

. Второй участок, длина которого

, а толщина плавно уменьшается от

до

. Третий участок, длина которого

, а его постоянная толщина равна

. Четвертый участок, длина которого

, а толщина плавно увеличивается от

до

. Пятый - задний участок листа длина которого

, а его постоянная толщина равна

.Note that the length of the rolled sheet contains five sections (figure 2). The first is the anterior section, the length of which

, and its constant thickness is equal to

. The second section, the length of which

, and the thickness gradually decreases from

before

. The third section, the length of which

, and its constant thickness is equal to

. The fourth section, the length of which

, and the thickness gradually increases from

before

. Fifth - the back section of the sheet, the length of which

, and its constant thickness is equal to

.

Before the start of rolling for each billet assortment from the block for setting the parameters of profiled rolling of the billet 20 (Fig. 1), the parameters are loaded into the memory cells of the block for setting the thickness of the rolled billet 6 and into the memory cells of the displacement intensity generator GNU 16. In addition, from the block 20 to the controller positions of HPU 3 load the initial gap between the rolls of stand 1.

From the block for setting the parameters of the profiled rolling of the workpiece 20, the distances Δ l ₁ , Δ l ₂ , ... Δ l i , ... _and sheet thickness h ₁ , h ₂ , … h _i ….

From block 20 to logical block 17 download the length of the five sections l ₀₁ , l _{n 1} , l _with , l _{n 2} , l ₀₂ (figure 2).

From block 20 to the generator of the intensity of movement of the GNU 16 download the rate of change of its output signal, as well as its maximum value.

(фиг.2), сформированные сигналы на выходе блока 6 также имеют вид «ступенек», которые в очередной опорной точке k (фиг.3,б) скачком увеличиваются на Δh _k . На фиг.2, фиг.3,б на длине участка h _{n 2} внутри круга в увеличенном масштабе показаны расстояния Δl _k , Δl _{k +1} и изменение толщины Δh _k «ступенька».The block for setting the thickness of the rolled workpiece 6 generates a signal for setting the thickness of the sheet along its length according to the longitudinal section shown in Fig.3, a. Block 6 stores a number of reference points 1, 2 ... i , ..., each of which is at a distance Δ l _i from the previous point (figure 3, b). For each point i from the memory block 6 at its output is formed a signal of the reference value of the thickness h _i . In this case, the location of the reference point 1 (Fig.3, a) is determined by the distance Δ l ₁ from the "head" (front end) of the rental, the location of the point 2 - by the distance Δ l ₂ from the point 1, etc. Note that on the length of the section equal to Δ l ₁ , the reference value of the thickness remains constant and equal to h ₁ , on the section Δ l ₂ - h ₂ , etc. Note that the generated signals at the output of block 6 remain constant in the areas l ₀₁ , l _with , l ₀₂ and equal to h ₀ , h _n , h ₀ , respectively. At the same time, over the length of the section h _{n 1} (figure 2), the generated signals at the output of block 6 have the form of "steps", which at the next reference point i abruptly decrease by Δ h _i . In Fig.3b on the length of the section h _{n 1} inside the circle on an enlarged scale shows the distance Δ l _i , Δ l _{i +1} and the change in thickness Δ h _i "step". On the length of the section

(figure 2), the generated signals at the output of the block 6 also have the form of "steps", which in the next reference point k (figure 3b) increase abruptly by Δ h _k . In Fig.2, Fig.3b on the length of the section h _{n 2} inside the circle on an enlarged scale shows the distance Δ l _k , Δ l _{k +1} and the change in thickness Δ h _k "step".

The logic block 17, by the signal from the sensor for the presence of the workpiece in the stand 8 and by the signal of the value of the current length l of the rolled sheet coming from the output of the block for calculating the length of the rolled workpiece 7, determines which of the five sections l ₀₁ , l _{n 1} , l _c , l _{n 2} , l ₀₂ (figure 2) is rolling. If the location of the current length l of the rolled sheet is in one of the three sections l ₀₁ , l _c or l ₀₂ , then at the first output of the logic block 17 a logical one signal is generated, and at the second - a logical zero. If the location of the current length l of the rolled sheet is in one of the two sections l _{n 1} or l _{n 2} , then at the first output of the logic block 17 a logical zero signal is generated, and at the second - a logical one. It should be noted that the operation of the block for setting the thickness of the rolled workpiece 6 is synchronized in time with the switching of signals at the outputs of the logic block 17.

The generator of the intensity of movement of the GNU 16 of the step signal, which is fed to its input (figure 3,b), generates a signal that changes linearly. On the length of the section l _{n 1} the output signal of the intensity generator 16 decreases, and on the length of the section - l _{n 2} increases. In addition, the function of the intensity generator 16 includes limiting the rate of change and limiting the maximum value of the output signal supplied to the actuator with a step change in the input signal (see Perelmuter V.M., Sidorenko V.A. Control systems for thyristor DC drives. - M.: Energoatomizdat, 1988. - P. 136).

The GNU position setting unit 19 converts the thickness setting signal supplied from the intensity generator 16 output into a signal proportional to the GNU position 2. The relationship between these values is determined by the Golovin-Sims equation (see, for example, Fomin G.G., Dubeikovsky A.V. ., Grinchuk P.S. Mechanization and automation of broadband hot rolling mills. - M .: Metallurgy, 1979. - P. 125 s):

,

,

where h is the thickness of rolled products at the outlet of the stand;

S is the size of the roll gap;

P - metal pressure on the rolls;

M _K - stand rigidity modulus.

.It follows from the above dependence that the position of HPU 2 is given by the function

.

This function is implemented by the block for setting the position of the hydraulic pressure device 19.

The device for controlling the profiled rolling of a slab billet on a plate mill with HPU operates as follows.

According to the program profiled rolling of the workpiece to ensure the required thickness of the sheet along its length (figure 2) for each assortment from the block for setting the parameters of profiled rolling of the workpiece 20, the corresponding parameters are loaded into the memory cells of the block for setting the thickness of the rolled workpiece 6 and into the memory cells of the intensity generator 16. Previously, the operation of these blocks has been described in detail. In addition, at the signal of the block for setting the parameters of the profiled rolling of the workpiece 20, the initial setting of the stand of the mill 1 is carried out by setting the initial gap between the rolls. This is performed by the position controller of the hydraulic pressure device 3 according to the signal from the first output of the block for setting the parameters of the profiled rolling of the billet 20.

Let at time t ₀ the inventive device for controlling profiled billet rolling received the command "mill start". In this case, the workpiece has not yet entered the rolls of the stand, and at the output of the sensor for the presence of the workpiece in the stand 8 (figure 1) the signal "no workpiece in the stand" is generated. This signal is fed to the input of the block for calculating the length of the rolled workpiece 7 and to the input of the block for setting the thickness of the rolled workpiece 6. Blocks 6 and 7 are prepared for operation. In addition, the signal "absence of the workpiece in the stand" is fed to the logic unit 17, the first output of which generates a logical zero signal, and the second - a logical unit. These signals open the first 12 and third 14 controlled keys, respectively, and close the second controlled key 13. Thus, the device for controlling profiled billet rolling is prepared for operation in the automatic thickness control mode. Earlier it was noted that this is the first mode of operation of the device, in which rolling is carried out with a given constant reduction.

, а его постоянная толщина равна

.When the workpiece enters the rolls (time t ₁ ) at the output of the sensor 8, the signal "presence of the workpiece in the stand" is generated. Starts rolling the first section of five along the length of the rolled sheet (figure 2). Earlier it was noted that this is the anterior part of the leaf, the length of which

, and its constant thickness is equal to

.

From the action of the signal "the presence of the workpiece in the stand" at the input of the logic block 17, its output signals do not change their values, while the controlled key 13 remains in the closed state, and the controlled keys 12 and 14 are in the open state. The inventive device remains ready to work in the mode of automatic thickness control.

на выходе блока 6 формируется постоянный сигнал, который соответствует заданной толщине проката

.Previously, it was described that after the signal "presence of the workpiece in the stand" is applied to the input of the block for calculating the length of the rolled workpiece 7, the latter generates a signal of the current length l of the rolled sheet. It was also described above how the block for setting the thickness of the rolled workpiece 6 generates a signal for setting the thickness of the sheet along its current length according to the longitudinal section shown in Fig.3, a. Thus, for the first (front) section of the length of the rolled sheet

at the output of block 6, a constant signal is generated, which corresponds to a given rolled thickness

.

заявляемое устройство работает в режиме автоматического регулирования толщины, т.е. в первом режиме работы.The device is prepared for operation in the automatic thickness control mode according to the mismatch signal coming from the output of the second summing element 11 to the input of the thickness controller 15. In this case, the signals from the output thickness sensor of the rolled workpiece 18 and the thickness setting unit are sent to the first and second inputs of the summing element 11, respectively. rolled workpiece 6. Thus, from time t ₁ (figure 2) in the area

the claimed device operates in the mode of automatic thickness control, i.e. in the first mode of operation.

The operation of the device during rolling in passes without profiling does not differ from the operation of the well-known double-circuit automatic thickness control system with an internal control loop for the position of hydraulic pressure devices (see, for example, Filatov A.S., Zaitsev A.P., Smirnov A.A. Automatic strip thickness stabilization systems during rolling, Moscow: Metallurgiya, 1982, 128 p.). A closed thickness control is carried out, while the HPU operates in the mode of small displacements, as a rule, less than 1 mm.

Let at time t ₂ the current length l of the rolled sheet exceeded the length of the first (front) section l>l ₀₁ (figure 2). In this case, the signals at the outputs of the logic block 17 are reversed. At the first output, a logical one signal is generated, and at the second, a logical zero. Due to this, the second managed key 13 opens, and the first 12 and third 14 managed keys go into the closed state. As a result, the reference signal at the input of the thickness controller 15 becomes equal to zero, the automatic thickness control circuit is opened. The device switches to the position control mode of the hydraulic pressure device 2.

, а толщина плавно уменьшается от

до

(фиг.2), т.е. заявляемое устройство переходит во второй режим работы. Ранее было описано, что на длине участка l _{n 1} (фиг.2) сигналы, сформированные на выходе блока задания толщины прокатываемой заготовки 6 имеют вид «ступенек», которые в очередной опорной точке i (фиг.3, а, б) скачком уменьшаются на Δh _i . Выше также было описано, что задатчик интенсивности перемещения ГНУ 16 из ступенчатого сигнала формирует сигнал задания толщины, который линейно уменьшается от h _i до h _{i +1}. Ранее отмечалось, что блок задания положения ГНУ 19 преобразует сигнал задания толщины в сигнал, пропорциональный положению ГНУ 2.From time t ₂ , rolling of the second section begins, the length of which

, and the thickness gradually decreases from

before

(figure 2), i.e. the claimed device enters the second mode of operation. It was previously described that over the length of the section l _{n 1} (figure 2), the signals generated at the output of the block for setting the thickness of the rolled workpiece 6 have the form of "steps", which at the next reference point i (figure 3, a, b) abruptly decrease on Δ h _i . It has also been described above that the GNU 16 displacement intensity generator generates a thickness setting signal from a stepped signal, which linearly decreases from h _i to h _{i +1} . It was noted earlier that the block for setting the position of the HDD 19 converts the signal for setting the thickness into a signal proportional to the position of the HDD 2.

As a result, mutual correspondence of the reference signal coming from the output of block 19 and the feedback signal coming from the output of the position sensor of the HPU 4 is ensured. positions 3, GNU 2 and the position sensor GNU 4. As a result, closed control of the movement of GNU 2 is provided, and due to this, the formation of a section l _{n 1} with a linearly decreasing thickness.

, а его постоянная толщина равна

. Ранее было отмечено, что это первый режим работы заявляемого устройства управления. При этом сигналы на выходах логического блока 17 изменяются на противоположные. На первом выходе формируется сигнал логический ноль, а на втором - логическая единица. За счет этого второй управляемый ключ 13 переходит в замкнутое состояние, а первый 12 и третий 14 управляемые ключи размыкаются. В результате сигнал задания толщины на входе задатчика интенсивности перемещения ГНУ 16 становится равным нулю, контур регулирования положения ГНУ размыкается. Устройство переходит в режим автоматического регулирования толщины.Let at time t ₃ the current length l of the rolled sheet exceeded the sum of the lengths of the first and second sections l> ( l ₀₁ + l _{n 1} ) (figure 2). The rolling of the third section begins, the length of which

, and its constant thickness is equal to

. It was previously noted that this is the first mode of operation of the proposed control device. In this case, the signals at the outputs of the logic block 17 are reversed. At the first output, a logical zero signal is generated, and at the second, a logical one. Due to this, the second managed key 13 goes into the closed state, and the first 12 and third 14 managed keys open. As a result, the signal for setting the thickness at the input of the displacement rate generator GNU 16 becomes equal to zero, the GNU position control loop opens. The device enters the automatic thickness control mode.

на выходе блока задания толщины прокатываемой заготовки 6 формируется постоянный сигнал, который соответствует заданной толщине проката

.From the time t ₃ the device operates in the mode of automatic thickness control according to the mismatch signal coming from the output of the second adder 11 to the input of the thickness controller 15. The device operation algorithm is the same as when rolling the front end of the strip l ₀₁ (figure 2). Note that in the third segment of the strip

at the output of the unit for setting the thickness of the rolled billet 6, a constant signal is generated that corresponds to the specified thickness of the rolled product

.

до

(фиг.2), т.е. заявляемое устройство переходит во второй режим работы.Let at time t ₄ the current length l of the rolled sheet exceeded the sum of the lengths of the first, second and third sections l> ( l ₀₁ + l _{n 1} + l _with ) (figure 2). The rolling of the fourth section begins, the length of which is l _{n 2} , and the thickness gradually increases from

before

(figure 2), i.e. the claimed device enters the second mode of operation.

When rolling a section of length l _{n 2} with increasing thickness, the operation of the device is similar to that considered in the section l _{n 1} . The difference is the formation at the output of the block 6 signal to increase the thickness from h _k to h _{k +1} (figure 3b).

(фиг.2), т.е. заявляемое устройство переходит в первый режим работы. При прокатке пятого участка работа устройства аналогична рассмотренной работе на участке l ₀₁ .Let at time t ₅ the current length l of the rolled sheet exceeded the sum of the lengths of the first, second, third and fourth sections l> ( l ₀₁ + l _{n 1} + l _c + l _{n 2} ) (figure 2). The rolling of the fifth section begins, the length of which is l ₀₂ , and the thickness remains constant and equal to

(figure 2), i.e. the claimed device enters the first mode of operation. When rolling the fifth section, the operation of the device is similar to the work considered in the section l ₀₁ .

,

и положения ГНУ на участках l _{n 1} , l _{n 2} с переменным профилем по длине. Замкнутое автоматическое регулирование каждого из этих параметров обеспечивает повышение точности регулирования и за счет этого - снижение продольной разнотолщинности.Thus, the operation of the proposed device provides the formation of a longitudinal section of the slab billet in accordance with the section shown in Fig.2. As a result, closed regulation of the given parameter is provided: thickness - in sections

,

and the position of the GNU in the areas l _{n 1} , l _{n 2} with a variable profile along the length. Closed-loop automatic control of each of these parameters provides an increase in control accuracy and, as a result, a reduction in longitudinal thickness variation.

Automatic separation of the mode of large displacements when controlling the position of the HPU and the mode of automatic thickness control in the mode of small displacements eliminates the occurrence of unacceptable forces in the hydraulic cylinders, reduces the risk of accidents and increases the reliability of the device.

The implementation of the technology of profiled rolling of the slab billet provides an improvement in the geometric parameters of the produced sheet and, due to this, a reduction in waste with side and end trim.

In general, the proposed device provides the ability to effectively control the profiled rolling of slab blanks on a thick-plate rolling mill with HDL, while improving reliability and improving the quality of products by reducing the longitudinal variation in thickness.

Claims (1)

A device for controlling profiled billet rolling in a rolling stand of a plate mill with a hydraulic pressure device (HLD), comprising a HHL position controller, a HHL position sensor, a HHL force sensor, a unit for setting the thickness of a rolled billet, a unit for calculating the length of a rolled billet, a sensor for the presence of a billet in the stand, and pulse sensor, wherein the output of the HLS position controller is configured to be connected to the input of the HLS, the pulse sensor is configured to be mechanically connected to one of the rolling rolls, the first input of the block for calculating the length of the rolled workpiece is connected to the output of the pulse sensor, and the second input of the specified block for calculating the length is connected to the output of the sensor for the presence of a workpiece in the stand, the input of which is connected to the output of the sensor for the presence of the workpiece in the stand, and the output of the specified length calculation unit is connected to the first input of the block for setting the thickness of the rolled workpiece, the second input of which is connected to the output of the sensor for the presence of the workpiece in the stand, differing which is provided by the fact that it is equipped with the first and second summing elements, the first, second and third controlled keys, the rolled workpiece thickness controller, the HDL displacement intensity generator, the logic block, the output thickness sensor of the rolled workpiece, the HLS position setting unit and the block for setting the parameters of profiled workpiece rolling , wherein the output of the first summing element is connected to the first input of the HLS position controller, the first input of the first summing element is connected to the output of the third controlled key, the first input of which is connected to the output of the HLS position sensor, the second input of the first summing element is connected to the output of said thickness controller, and its third input - with the output of the block for setting the position of the HPU, the input of which is connected to the output of the GNU displacement intensity generator, the first input of which, through the first controlled key, is connected to the output of the said thickness setting block, the first input of the logic block is connected to the output ohm of the sensor for the presence of a workpiece in the stand, and its second input is connected to the output of the said length calculation block, the first output of the logic block is connected to the control inputs of the first and third controlled keys, and the second output of the logic block is connected to the control input of the second controlled key, while the input of the mentioned the thickness controller is connected through the second controlled key to the output of the second summing element, the first input of which is connected to the output of the output thickness sensor of the rolled workpiece, and the second input is connected to the output of the said thickness setting unit, the first output of the mentioned parameter setting unit is connected to the second input of the HPU position controller , the second output - with the third input of the logical block, the third output - with the third input of the block for setting the thickness of the rolled workpiece, and the fourth output - with the second input of the HDD displacement rate generator.

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