CN114888096A - Method for controlling plate shape by bending roller in segmented manner - Google Patents

Abstract

The invention discloses a method for controlling a plate shape by bending rolls in a segmented manner, which relates to the technical field of hot-rolled strip steel wave shape, and aims to solve the problems that in the prior art, after an operator observes a monitoring picture, manual intervention is performed to adjust the plate shape, the group difference is large, the control precision is low, the final plate shape fluctuation is large, and the high requirement of a user on the plate shape is difficult to meet, the following scheme is proposed, wherein the method for controlling the plate shape by bending rolls in a segmented manner comprises the following steps: s1, starting an F7 bending roll section control plate shape function; s2, detecting the plate shape value and carrying out filtering processing; s3, judging the filtered plate shape value according to the thickness layer; s4, performing feedback control on the bending roller based on the wave-shaped target value; and S5, controlling the wave shape of the strip steel by bending rollers in sections. The invention carries out real-time feedback control on the plate shape by setting target wave shape values of different specifications of steel grades, realizes automatic regulation control and reduces strip steel wave shape defects and manual intervention loads.

Description

A method of bending roll segmented control plate shape

technical field

The invention relates to the technical field of the wave shape of hot-rolled strip steel, in particular to a method for segmental control of the shape of a bending roll.

Background technique

Strip shape is an important control index in the rolling process of hot-rolled coils. As users have higher and higher requirements for strip shape, higher requirements are placed on the shape control accuracy of hot-rolled raw materials. Especially for hot-rolled high-strength steel, the uneven plastic deformation and temperature difference in the length or width direction of the strip during the rolling process are not reflected at the finish rolling outlet, but after laminar cooling and re-opening, it will be found. The strip steel has serious flatness defects, among which the double-sided wave defect of the inner ring is particularly prominent, which needs to be flattened or heat treated and repaired, which increases the manufacturing cost.

In order to improve the double-sided wave defect of the inner ring of the hot coil, the existing technology adopts the micro-middle wave rolling technology, which can and has been applied to the rolling of many high-strength steel products, and has become one of the important measures to solve the shape problem of hot-rolled high-strength steel plates. The shape adjustment mainly relies on manual intervention and adjustment by manually observing the actual strip shape on the monitoring screen of the finishing rolling exit. However, it depends on the operator to observe the monitoring screen and then manually intervene to adjust the shape. The shape fluctuation is large, and it is difficult to meet the high requirements of users for the shape. In conventional hot continuous rolling production lines, the shape control relies on manual operation of the rack bending rolls to control the shape, and there is a lack of feedback control, especially for different steel grades. wave situation. Therefore, in order to solve such problems, we propose a method to control the shape of the bending roll segmentally.

SUMMARY OF THE INVENTION

The method for controlling the shape of the bending roller in sections provided by the present invention solves the problem of relying on the operator to observe the monitoring screen and then manually intervene to adjust the shape of the shape, resulting in large differences between teams and low control accuracy, resulting in the final The plate shape fluctuates greatly, and it is difficult to meet the high requirements of users on the plate shape.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for controlling the shape of a curved roller segmentally, the method steps of the segmented control of the shape of the curved roller are as follows:

S1. Start the F7 bending roller segment control shape function;

S2. Detect the shape value and perform filtering processing;

S3. Judging the filtered shape value according to the thickness layer;

S4. Feedback control is performed on the bending roll based on the wave shape target value;

S5. Control the strip wave shape in sections by bending rollers;

The wave shape feedback control method of hot-rolled strip based on moving average filtering, through the moving average filtering processing of the actual wave shape detected at the exit of the finishing rolling F7 stand, the actual wave shape after the F7 stand is processed according to the moving average filtering. The deviation from the target wave shape is extracted, the trend change of the wave shape is extracted, the bending force of the F7 roll is dynamically adjusted, the real-time feedback adjustment of the strip shape is carried out, a fixed bending roll force is added based on the head, and the bending roll is added to the middle part. Force, increase the bending force to the tail, so as to carry out segmented control.

Preferably, the step S1 involved in the activation of the F7 bending roll segment control plate shape function, because L1 cannot identify the steel type, it is necessary to issue the identification bit of the commissioning program through L2, and to issue the identification bit of the steel type through L2, Thereby, the L1 program can start the F7 bending roller segment control shape function through the identification bit.

Preferably, the detection of the shape value involved in the step S2 is filtered, and after the data is detected by the flatness meter, according to the actual shape value detected, delay for a period of time, and the collected wave The shape values are arranged into a queue of length N for filtering.

Preferably, the filtered shape value involved in the step S3 is judged according to the thickness layer, and based on the filtering process involved in the step S2, when the collected wave shape value queue length is less than N, the filter does not do output;

When the length of the collected wave value is N, the arithmetic mean of the output queue;

And when the next acquisition cycle comes, a new data is added, an old data is removed, and the arithmetic mean of the queue is output again, and so on, until the pinch roller bites the steel and the filtering process ends.

Preferably, the parameters of the moving average filter are set as follows:

Queue length N: 6; acquisition period Ts: 200ms; delay time: 1s;

The wave shape value arrangement filtering processing:

N: refers to the number of data collection points;

For example, N=6, which means collecting 6 flatness data and taking the average value;

下一个平直度实测值C7采集到后，抛掉序列第一个数据C1，然后计算当前采样值C7前推6个数C2-C7的平均值，随后处理数据以此类推。When the number of strip flatness data samples is greater than 6, the sliding filter calculation is started. The first group of strip flatness values cf ₆ after sliding filtering is equal to the first six flatness data including the current sampling value C6. the average value of , namely:

After the next measured flatness value C7 is collected, discard the first data C1 of the sequence, and then calculate the average value of the 6 numbers C2-C7 pushed forward by the current sampling value C7, and then process the data and so on.

Preferably, the feedback control of the bending rollers based on the wave shape target value involved in the step S4 is performed, and the feedback control is performed based on the wave shape target value. :

If the detected shape filter value is greater than the target value range, F7 increases the bending force;

If the detected shape filter value is less than the target value range, perform F7 to lower the bending roller force, and the lifting and bending roller uses the operation button to output the signal;

If the detected flatness filter value is within the target value range, the F7 bending force is maintained.

Preferably, feedback control is performed on the bending roll based on the wave shape target value involved in the step S4, the feedback is stopped after the pinch roll bites the steel, and the automatically adjusted bending roll force is cleared after the flying shearing tail.

Preferably, the step S5 involved in the step S5 is to control the wave shape of the strip through the bending rollers, which is based on filtering to obtain the flatness data, adjust the bending rollers, and the wave shape control interval is tracked on the leveling machine according to the actual object, while the actual object is tracked on the machine. The plate shape and flatness value are used to formulate a reasonable control interval, and the detailed control of calculation and filtering is carried out based on the formula. Among them, the strip is mainly controlled according to the micro-medium wave. If it is a micro-medium wave and reaches the control interval, it is not necessary to increase If the bending force does not reach the control range, it is necessary to calculate the newly added bending force according to the formula, so as to control the strip wave shape through the bending roll segment.

Preferably, the formula for establishing the bending force output is as follows:

Δbend: F7 fixed bending force that needs to be increased;

flt: mean 1S-2S wave shape at the head of the strip;

FLT: The median of the control interval for the target value of strip wave shape;

steel: L1 steel grade code issued by L2;

w: width of finished strip;

h: thickness of finished strip;

flt-FLT≤0, no adjustment is performed.

The beneficial effects of the invention are as follows: by setting target wave shape values of different specifications of steel, the rolling process performs real-time feedback control on the flat shape, so as to achieve the desired flat shape, realize the automatic adjustment control of the strip shape, and reduce the strip steel shape. Wave defects, while reducing manual intervention load.

To sum up, the method for controlling the shape of the bending roll segmentally realizes the automatic adjustment and control of the strip wave shape, reduces the strip steel wave shape defects, and reduces the manual intervention load at the same time.

Description of drawings

FIG. 1 is a step diagram of the method for controlling the shape of a bending roll segmentally according to the present invention.

FIG. 2 is a schematic diagram of the shape detection of the method for controlling the shape of the bending roll segmentally according to the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

A method for controlling the shape of a curved roller segmentally, the method steps of the segmented control of the shape of the curved roller are as follows:

S1. Start the F7 bending roller segment control shape function;

S2. Detect the shape value and perform filtering processing;

S3. Judging the filtered shape value according to the thickness layer;

S4. Feedback control is performed on the bending roll based on the wave shape target value;

S5. Control the strip wave shape in sections by bending rollers;

The wave shape feedback control method of hot-rolled strip based on moving average filtering, through the moving average filtering processing of the actual wave shape detected at the exit of the finishing rolling F7 stand, the actual wave shape after the F7 stand is processed according to the moving average filtering. The deviation from the target wave shape is extracted, the trend change of the wave shape is extracted, the bending force of the F7 roll is dynamically adjusted, the real-time feedback adjustment of the strip shape is carried out, a fixed bending roll force is added based on the head, and the bending roll is added to the middle part. Force, increase the bending force to the tail, so as to carry out segmented control.

The step S1 involved in starting the F7 bending roller segment control plate shape function, because L1 cannot identify the steel type, it is necessary to issue the identification bit of the commissioning program through L2, and issue the identification bit of the steel type through L2, so that the L1 The program starts the F7 bending roller segment control shape function through the flag bit.

The detected shape value involved in the step S2 is filtered, and after the data is detected by the flatness meter, the collected shape value is arranged after a delay of a period of time according to the detected actual shape value. A queue of length N is formed and filtered.

The filtered shape value involved in the step S3 is judged according to the thickness layer, and based on the filtering process involved in the step S2, when the collected wave shape value queue length is less than N, the filter does not output;

When the length of the collected wave value is N, the arithmetic mean of the output queue;

And when the next acquisition cycle comes, a new data is added, an old data is removed, and the arithmetic mean of the queue is output again, and so on, until the pinch roller bites the steel and the filtering process ends.

The parameters of its moving average filter are set as follows:

Queue length N: 6; acquisition period Ts: 200ms; delay time: 1s;

The wave shape value arrangement filtering processing:

N: refers to the number of data collection points;

For example, N=6, which means collecting 6 flatness data and taking the average value;

下一个平直度实测值C7采集到后，抛掉序列第一个数据C1，然后计算当前采样值C7前推6个数C2-C7的平均值，随后处理数据以此类推。When the number of strip flatness data samples is greater than 6, the sliding filter calculation is started. The first group of strip flatness values cf ₆ after sliding filtering is equal to the first six flatness data including the current sampling value C6. the average value of , namely:

After the next measured flatness value C7 is collected, discard the first data C1 of the sequence, and then calculate the average value of the 6 numbers C2-C7 pushed forward by the current sampling value C7, and then process the data and so on.

The step S4 involved in the feedback control of the bending roller based on the wave shape target value, and the feedback control based on the wave shape target value, which judges the filtered shape value according to the thickness level, and the judgment basis is as follows:

If the detected shape filter value is greater than the target value range, F7 increases the bending force;

If the detected shape filter value is less than the target value range, perform F7 to lower the bending roller force, and the lifting and bending roller uses the operation button to output the signal;

If the detected flatness filter value is within the target value range, the F7 bending force is maintained.

The feedback control of the bending rolls involved in the step S4 based on the wave shape target value, the feedback stops after the pinch rolls bite the steel, and the automatically adjusted bending roll force is reset to zero after the flying shearing tail.

The step S5 involved in the step S5 is to control the wave shape of the strip by bending the rolls, which is based on filtering to obtain the flatness data, and adjust the bending rolls. A reasonable control interval is formulated with the straightness value, and the detailed control of calculation and filtering is performed based on the formula. The strip is mainly controlled according to the micro-medium wave. If it is a micro-medium wave and reaches the control interval, there is no need to increase the bending force. , if it does not reach the control range, it is necessary to calculate the newly added bending force according to the formula, so as to control the strip wave shape through the bending roll segment.

The established formula for the bending force output is as follows:

Δbend: F7 fixed bending force that needs to be increased;

flt: mean 1S-2S wave shape at the head of the strip;

FLT: The median of the control interval for the target value of strip wave shape;

steel: L1 steel grade code issued by L2;

w: width of finished strip;

h: thickness of finished strip;

flt-FLT≤0, no adjustment is performed.

Example

A method of bending roll segmented shape control, based on a sliding average filtering method for hot-rolled strip wave shape feedback control, by performing sliding average filtering processing on the actual value of the wave shape detected at the exit of the finishing F7 stand, in F7 The frame extracts the trend change of the wave shape according to the deviation between the actual wave shape and the target wave shape after moving average filtering, dynamically adjusts the bending force of the F7, and performs real-time feedback adjustment to the strip shape.

Since L1 cannot identify the steel type, it is necessary to issue the identification bit of the commissioning program through L2, and through the L2 to issue the identification bit of the steel type, the L1 program starts the F7 bending roll segment control shape function through the identification bit.

After the flatness meter detects the data, according to the actual shape value detected, delay for a period of time, arrange the collected wave shape value into a queue of length N, and perform filtering processing. When the queue length is less than N, the filter No output; when the length is N, the arithmetic mean of the queue is output; when the next collection cycle comes, a new data is added, an old data is removed, and the arithmetic mean of the queue is output again, and so on, until the pinch roller bites Steel, the filtering process is over, the parameters of the moving average filter are set as follows:

Queue length N: 6; acquisition period Ts: 200ms; delay time: 1s.

Wave shape target value feedback control: The filtered shape value is judged according to the thickness layer. If the detected shape filter value is greater than the target value range, F7 increases the bending force; if the detected shape filter value is less than When the target value is in the range of the target value, F7 is used to lower the bending roller force, and the lifting and bending rollers use the operation button to output the signal; if the detected shape filter value is within the target value range, the F7 bending roller force is maintained, and the feedback stops after the pinch roller bites the steel. , after the flying shear tail, the automatic adjustment bending roller force will be reset to zero.

Description of other matters: When this function is used, the manual bending roller intervention learning function of F7 is disconnected. If there is manual intervention during the process, the automatic control function will be disconnected.

By exploring the relationship between the shape and the bending roll, the development and application of a shape control method is formed, which realizes the automatic control of the shape, improves the control accuracy of the shape, and greatly reduces the manual intervention.

Waveform value arrangement filtering processing:

N: refers to the number of data collection points;

For example, N=6, which means collecting 6 flatness data and taking the average value;

下一个平直度实测值C7采集到后，抛掉序列第一个数据C1，然后计算当前采样值C7前推6个数C2-C7的平均值，随后处理数据以此类推。When the number of strip flatness data samples is greater than 6, the sliding filter calculation is started. The first group of strip flatness values cf ₆ after sliding filtering is equal to the first six flatness data including the current sampling value C6. the average value of , namely:

After the next measured flatness value C7 is collected, discard the first data C1 of the sequence, and then calculate the average value of the 6 numbers C2-C7 pushed forward by the current sampling value C7, and then process the data and so on.

Features: The collection frequency is defined according to the collection cycle and data processing.

Function: It mainly plays the role of smoothing the flatness data to avoid the influence of single-point outliers.

And without filtering processing, the data jitter is large; with filtering processing, the data is relatively stable.

Filtering is mainly to obtain accurate flatness data, which plays a great role in the adjustment of the bending rollers.

The wave shape control interval is to formulate a reasonable control interval according to the physical object tracking on the machine, and the physical shape and flatness value at the same time.

The filtering details are controlled according to the above formula. The strip is mainly controlled according to the micro-medium wave. If it is the micro-medium wave itself and reaches the control range, there is no need to increase the bending force. If the control range is not reached, the newly added bending force needs to be calculated according to the formula.

Segmentation control: It is mainly based on adding a fixed bending force to the head, and it is also possible to increase the bending force to the middle and increase the bending force to the tail. This patent is mainly aimed at increasing the fixed bending force of the head.

Example 2

Experimental data

a. Through the test, explore the relationship between the wave shape and the bending roll adjustment, and divide it into different hardness, thickness and width, and adjust the bending force of the -10IU wave shape.

b. Through data collation, the bending force of -10IU is required for each layer to be adjusted separately.

hard thick width -10IU hard thick width -10IU 1 1 1 32 3 1 1 52 1 1 2 30 3 1 2 40 1 1 3 twenty four 3 1 3 30 1 1 4 14 3 1 4 20 1 2 1 65 3 2 1 85 1 2 2 50 3 2 2 61 1 2 3 39 3 2 3 45 1 2 4 27 3 2 4 33 1 3 1 94 3 3 1 114 1 3 2 65 3 3 2 75 1 3 3 47 3 3 3 53 1 3 4 34 3 3 4 40 1 4 1 115 3 4 1 120 1 4 2 83 3 4 2 80 1 4 3 58 3 4 3 65 1 4 4 43 3 4 4 49 2 1 1 42 4 1 1 62 2 1 2 35 4 1 2 43 2 1 3 27 4 1 3 32 2 1 4 17 4 1 4 twenty three 2 2 1 75 4 2 1 95 2 2 2 55 4 2 2 64 2 2 3 42 4 2 3 47 2 2 4 30 4 2 4 35 2 3 1 104 4 3 1 128 2 3 2 70 4 3 2 83 2 3 3 50 4 3 3 59 2 3 4 37 4 3 4 45 2 4 1 115 4 4 1 133 2 4 2 88 4 4 2 87 2 4 3 62 4 4 3 63 2 4 4 46 4 4 4 50

c. For formula fitting, the hardness is 4 layers (hardness 6-8), the width is 1 layer (width <= 1000mm), and the thickness is 1 layer (<= 2.1mm) layer adjustment - 10IU wave shape requires 62KN bending roller Based on the force, the relationship between hardness, width and thickness is fitted.

Hardness relationship:

Width relationship:

Thickness relationship:

Finally established the bending force output formula:

Δbend: F7 fixed bending force that needs to be increased;

flt: mean 1S-2S wave shape at the head of the strip;

FLT: The median of the control interval for the target value of strip wave shape;

steel: L1 steel grade code issued by L2;

w: width of finished strip;

h: thickness of finished strip;

flt-FLT≤0, no adjustment is performed.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (9)

1. a method of bending roller segmented control plate shape, is characterized in that, the method steps of described bending roller segmented control plate shape are as follows: S1. Start the F7 bending roller segment control shape function; S2. Detect the shape value and perform filtering processing; S3. Judging the filtered shape value according to the thickness layer; S4. Feedback control is performed on the bending roll based on the wave shape target value; S5. Control the strip wave shape in sections by bending rollers; The wave shape feedback control method of hot-rolled strip based on moving average filtering, through the moving average filtering processing of the actual wave shape detected at the exit of the finishing rolling F7 stand, the actual wave shape after the F7 stand is processed according to the moving average filtering. The deviation from the target wave shape is extracted, the trend change of the wave shape is extracted, the bending force of the F7 roll is dynamically adjusted, the real-time feedback adjustment of the strip shape is carried out, a fixed bending roll force is added based on the head, and the bending roll is added to the middle part. Force, increase the bending force to the tail, so as to carry out segmented control. 2 . The method for controlling the shape of a bending roll segmented according to claim 1 , wherein the step S1 involves initiating the F7 bending roller segmented control shape function, which cannot identify the steel grade due to L1 . 3 . , it is necessary to issue the identification bit of the commissioning program through L2, and issue the identification bit of the steel grade through L2, so that the L1 program can start the F7 bending roller segment control shape function through the identification bit. 3 . The method for controlling the shape of a bending roller segmented according to claim 1 , wherein the detection of the shape value involved in the step S2 is performed by filtering, and the flatness meter detects the After the data, according to the actual shape value detected, after a period of delay, the collected wave shape values are arranged into a queue of length N for filtering processing. 4 . The method for controlling the shape of a bending roller segmented according to claim 1 , wherein the filtered shape value involved in the step S3 is judged according to the thickness level, based on the step S2 . 5 . The filtering process involved, when the length of the collected wave value queue is less than N, the filter does not output; When the length of the collected wave value is N, the arithmetic mean of the output queue; And when the next acquisition cycle comes, a new data is added, an old data is removed, and the arithmetic mean of the queue is output again, and so on, until the pinch roller bites the steel and the filtering process ends. 5. the method for a kind of bending roller segmented control plate shape according to claim 4 is characterized in that, the parameter setting of its moving average filter is as follows: Queue length N: 6; acquisition period Ts: 200ms; delay time: 1s; The wave shape value arrangement filtering processing: N: refers to the number of data collection points; For example, N=6, which means collecting 6 flatness data and taking the average value;

When the number of strip flatness data samples is greater than 6, the sliding filter calculation is started. The first group of strip flatness values cf ₆ after sliding filtering is equal to the first six flatness data including the current sampling value C6. the average value of , namely:

After the next measured flatness value C7 is collected, discard the first data C1 of the sequence, and then calculate the average value of the 6 numbers C2-C7 pushed forward by the current sampling value C7, and then process the data and so on. 6. a kind of method for bending roller segmented control plate shape according to claim 1, is characterized in that, described step S4 involves based on wave shape target value to carry out feedback control to bending roller, based on wave shape target value to carry out feedback control Feedback control, which judges the filtered shape value according to the thickness layer, and its judgment is based on the following: If the detected shape filter value is greater than the target value range, F7 increases the bending force; If the detected shape filter value is less than the target value range, perform F7 to lower the bending roller force, and the lifting and bending roller uses the operation button to output the signal; If the detected flatness filter value is within the target value range, the F7 bending force is maintained. 7 . The method for controlling the shape of a bending roll segmented according to claim 6 , wherein the step S4 involves feedback control on the bending roll based on the wave shape target value, and the pinch roll bites the steel. 8 . After the feedback stops, the automatic adjustment bending roller force is cleared after flying shearing tail. 8 . The method for controlling the shape of a strip by bending a roll segment according to claim 1 , wherein the step S5 involves controlling the strip steel wave shape by segment by bending the roll, which obtains the flatness based on filtering. 9 . Data, adjust the bending roll, the wave shape control interval is tracked according to the physical object on the machine, and at the same time the physical shape and flatness value to formulate a reasonable control interval, and the detailed control of calculation and filtering is performed based on the formula. It is mainly controlled according to the micro-medium wave. If it is a micro-medium wave and reaches the control range, it is not necessary to increase the bending force. Control strip wave shape. 9. The method for controlling the shape of a bending roller segmented according to claim 8, wherein the formula for establishing the output of the bending roller force is as follows:

Δbend: The F7 fixed bending force that needs to be increased; flt: mean 1S-2S wave shape at the head of the strip; FLT: The median of the control interval for the target value of strip wave shape; steel: L1 steel grade code issued by L2; w: width of finished strip; h: thickness of finished strip; flt-FLT≤0, no adjustment is performed.

Images