CN115069779A

CN115069779A - Control method for improving head floating of thin strip steel

Info

Publication number: CN115069779A
Application number: CN202110281059.2A
Authority: CN
Inventors: 李美华; 汪明新; 廖松林
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2022-09-20

Abstract

The invention relates to a control method for improving the head floating of thin strip steel, which comprises the following steps: step 1: preparing by a data preparation module; step 2: the calculation module carries out calculation; and step 3: the automatic control module controls; the method not only greatly improves the problem of head floating of the thin gauge strip steel, but also ensures the plate shape control precision of all thin gauge strip steel. The scrap time of the hot continuous rolling strip steel is reduced, the yield of a hot continuous rolling production line is greatly improved, and the cost reduction and the efficiency improvement of a company are made.

Description

Control method for improving head floating of thin strip steel

Technical Field

The invention relates to a control method, in particular to a control method for improving the head floating of thin strip steel, and belongs to the technical field of hot continuous rolling production control.

Background

In the actual production of hot continuous rolling, in order to solve the problem of strip shape brought by laminar cooling, a plurality of steel types are solved by adopting a slight middle wave rolling method, the slight middle wave rolling is set by a certain amount of middle waves given by a finish rolling end frame under the normal flatness calculation condition, the value of a bending roll force in the adjusting process is a set middle wave target value, but the middle wave rolling can solve the problem of strip shape of partial strip steel in the whole length, but also brings new problems at the same time: the head of the strip steel is easy to rub a transition plate or a roller way after the head of the strip steel is out of a finish rolling final stand in a middle wave state, so that the head of the strip steel floats, and folding or scrap steel is generated in serious cases. The cost of the waste reduction of the hot continuous rolling is increased, and the improvement of the finished material of the hot continuous rolling production line is not facilitated, so that a new scheme is urgently needed to solve the technical problem.

Disclosure of Invention

The invention provides a control method for improving the head floating of thin strip steel, aiming at the problems in the prior art, the technical scheme realizes micro-middle wave control by closing the bending roll real-time adjustment function and configuring the minimum bending roll force, and simultaneously adopts temperature segmented control to improve the double-side wave problem of a checkered plate.

In order to achieve the purpose, the technical scheme of the invention is that the control method for improving the head floating of the thin-specification strip steel comprises the following steps:

step 1: the data preparation module prepares;

step 2: the calculation module performs calculation;

and step 3: and the automatic control module controls.

As an improvement of the present invention, the step 1 data preparation module specifically includes:

1.1, configuring a plate shape setting actual performance table (shown in table 1) according to the hot continuous rolling filing rolling actual performance, wherein the table is configured with micro-Zhonglang configuration values corresponding to different thickness grades to which tapping marks belong and which belong to different races and to which strip steel finished product specifications belong;

1.2L2 process control system plate shape model, finding out corresponding race and thickness grade according to the current steel tapping mark and the target width thickness of the strip steel, and reading the micro-Zhonglang configuration value of the plate shape setting performance table according to the keywords of the race and the thickness grade;

the strip shape setting module of the 1.3L2 process control system calculates the strip shape setting of the current seven racks of the strip steel according to the original data of the strip steel at the hot continuous rolling finish rolling inlet, the actually detected incoming material data of temperature, thickness, width and the like, the strip shape self-learning data of the last strip steel, the strip shape requirement target of the finished strip steel and the like.

As an improvement of the present invention, the calculating module in step 2 specifically includes:

the L1 basic automatic calculation module receives the micro middle wave configuration value and the strip shape setting issued by the L2, judges whether the strip steel is rolled by the micro middle wave, and if so, reduces the roll bending force setting in the strip shape setting issued by the L2 according to a roll bending force adjusting configuration difference table (shown in a table 2); if not, judging whether the head of the strip steel has middle waves or not, if so, multiplying the head of the strip steel by an attenuation gain value according to a bending roll force adjustment configuration difference table (shown in table 2), and then reducing the bending roll force setting in the strip shape setting issued by L2. The method comprises the following specific implementation steps:

2.1L1 basic automatic calculation module judges according to the received micro-Zhonglang configuration value and the plate shape setting data, whether the strip steel is rolled by micro-Zhonglang or not, if the strip steel is rolled by micro-Zhonglang, the calculation of step 2.2 is executed, if the strip steel is not rolled by micro-Zhonglang, the head of the strip steel is judged whether the strip steel has middle-lang or not, if the head of the strip steel has middle-lang, the calculation of step 2.3 is executed, otherwise, the control is carried out according to the plate shape setting issued by L2;

2.2 according to the micro-moderate wave configuration value, finding out a corresponding bending force adjustment amount according to a bending force adjustment configuration difference table (shown in table 2), multiplying the corresponding bending force adjustment amount by an attenuation gain, reducing the bending force given value in the plate shape setting issued by L2, and if the bending force is micro-moderate wave rolling, taking the attenuation gain value as 1;

2.3 if the strip steel is not micro-moderate rolling, judging whether the head of the strip steel has moderate waves, if so, multiplying the roll bending force by an attenuation gain value according to a roll bending force adjustment configuration difference table (shown in table 2), reducing the roll bending force given value in the strip shape setting issued by L2, and if not, judging that the head of the strip steel has moderate waves, and then, taking the attenuation gain value to be 0.3;

2.4 if the roll bending force set value in the L2 plate shape setting updated by the L1 basic automation calculation module is less than the hardware limit, the roll bending force set value is set according to the roll bending force limited by the hardware.

As a modification of the present invention, the step 3: the automatic control module specifically comprises the following components:

3.1 before the last frame of the hot continuous rolling finish rolling bites steel, an L1 basic automatic control module controls the strip steel according to the updated plate shape setting calculated in the previous step;

3.2 until the last frame of the finish rolling bites steel, the L1 basic automation control module controls the strip steel according to the plate shape setting issued by the L2.

Compared with the prior art, the invention has the advantages that 1) the technical scheme realizes the steel grade division and the specification division configuration of the micro-Zhonglang given value through the L2 process control system, automatically adjusts the roll bending force according to different micro-Zhonglang through the L1 basic electric automatic system, and exerts the 'control' and 'automation' characteristics of the L2 control system and the L1 automatic system to the maximum, and the L2 process control system can realize the fine control according to the steel grade and the specification division, and the fine control can be dynamically adjusted according to the field working condition change and the production performance of the strip steel; 2) the method solves the problem that the head of the thin-specification strip steel floats by combining an L2 process control system with an L1 basic electric automation system; the method solves the problem that the head of the thin strip steel floats, and simultaneously can ensure the micro-medium wave rolling state of the integral strip steel plate shape. The method can also be used for improving the problem of floating of the head of the thin-specification strip steel during non-micro medium wave rolling; 4) in the experimental stage, the folding incidence rate caused by head raising of the strip steel is reduced from 1% to 0.3%, the repair incidence rate caused by folding is 0.5% per month, the repair is reduced to 0.15% on a same basis, the economic benefit is the head folding reduction proportion caused by rising and drifting, the annual yield is the repair cost (0.5% -0.15%), 120 ten thousand tons is 100 yuan/ton is 42 ten thousand yuan, and the cost reduction and the efficiency improvement can be realized for a company by 42 ten thousand yuan at least in a preliminary estimation every year.

Drawings

FIG. 1 is a flow chart of an original control method;

FIG. 2 is a flow chart of a control method for improving the head floating of thin gauge strip steel.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: a control method for improving the head floating of thin strip steel is disclosed, and is characterized in that according to the flow chart of the control method for improving the head floating of the thin strip steel shown in figure 2, an L1 basic automatic control system automatically adjusts the bending roll force set by L2 according to the micro-moderate wave configuration of different steel types and different thicknesses issued by an L2 system according to the micro-moderate wave rolling and the wave shape of the head of the strip steel, so that the strip steel is prevented from floating and being folded. After the strip head is penetrated stably, the strip shape is controlled according to the bending roll force set by the L2, so that the strip shape of the strip head can be ensured, and the micro-medium wave rolling state of the whole strip shape can be ensured. The method has excellent production and application effects on the thin-specification checkered plate rolled by the micro-Zhonglang initially, is popularized to the production control of all strip steels with the problem of head floating, and effectively solves a series of production cost problems caused by the head floating of the strip steels during the micro-Zhonglang rolling.

The control method comprises the following steps:

step 1: a data preparation module;

and 2, step: a calculation module;

and 3, step 3: and an automation control module.

The step 1 data preparation module specifically comprises the following steps:

table 1: plate shape setting actual performance table

Race of ethnic group	Thickness grade	Micro-billow configuration
			5	2	15
5	102	20
			13	103	20
13	104	20
			25	201	20
25	203	25
			25	301	30
25	302	30

and a strip shape setting module of the 1.3L2 process control system calculates the strip shape setting of seven current strip steel racks according to the original data of the strip steel at the hot continuous rolling finish rolling inlet, the incoming material data of the actually detected temperature, thickness, width and the like, the strip shape self-learning data of the last strip steel, the strip shape requirement target of the finished strip steel and the like.

The calculating module in the step 2 comprises the following concrete steps:

the L1 basic automatic calculation module receives the micro-Zhonglang configuration value and the strip shape setting issued by the L2, judges whether the strip steel is subjected to micro-Zhonglang rolling, and if so, reduces the roll bending force setting in the strip shape setting issued by the L2 according to a roll bending force adjusting configuration difference table (shown in a table 2); if not, judging whether the head of the strip steel has middle waves or not, if so, multiplying the head of the strip steel by an attenuation gain value according to a bending roll force adjustment configuration difference table (shown in table 2), and then reducing the bending roll force setting in the strip shape setting issued by L2. The method comprises the following specific implementation steps:

2.2 according to the micro-Zhonglang configuration value, finding out a corresponding bending force adjustment amount according to a bending force adjustment configuration difference table (shown in table 2), multiplying the corresponding bending force adjustment amount by an attenuation gain, reducing the bending force given in the strip shape setting issued by L2, and if the roll is micro-Zhonglang rolling, taking the attenuation gain as 1;

table 2: roll bending force adjusting configuration difference table

Micro-billow configuration	≤10	≤15	≤20	≤25	＞25
						Little middle wave attenuation gain	1.0	1.0	1.0	1.0	1.0
Non-micro middle wave attenuation gain	0.3	0.3	0.3	0.3	0.3
						Roll bending force adjustment	50*gain	130*gain	200*gain	260*gain	320*gain

The step 3: the automatic control module specifically comprises the following components:

3.2 until the last frame of the finish rolling bites steel, the L1 basic automation control module controls the strip steel according to the plate shape setting issued by the L2. According to the method, the given control of steel grade division and specification configuration of micro-Zhonglang is realized through an L2 process control system, the roll bending force is automatically adjusted through an L1 basic electric automatic system according to different micro-Zhonglang, the 'control' and 'automation' characteristics of the L2 control system and the L1 automatic system are brought into full play to the greatest extent, and a solution direction is provided for the subsequent realization of automatic production. The L2 process control system can realize fine control according to steel types and specifications, and the fine control can be dynamically adjusted according to field working condition changes and production actual results of strip steel. The control can be used for improving the problem of head floating of the strip steel rolled by the micro medium waves, can also be used for improving the problem of head medium waves of the strip steel rolled by the non-micro medium waves, and effectively improves the problem of head floating of the thin strip steel.

Specific example 1: taking GR3180F2 of domestic 1422 hot continuous rolling production line 1.8 x 1250 as an example, a control method for improving the head floating of thin strip steel is applied to the control realization steps of micro-moderate wave rolling:

step 1: a data preparation module;

1.1L 2 process control system plate model, according to the current steel tapping mark GR3180F2, the target width thickness 1.8X 1250 of strip steel find the corresponding race 25, thickness grade 302. The micro-Zhonglang configuration value 30 of the plate shape setting performance table (shown in table 1) is read according to the ethnicity 25 and the thickness grade 302 keywords.

The strip shape setting module of the 1.2L2 process control system calculates the current strip shape setting according to the original data of the strip steel at the hot continuous rolling finish rolling inlet, the actually detected incoming material data of temperature, thickness, width and the like, the strip shape self-learning data of the last strip steel, the strip shape requirement target of the finished strip steel and the like. The roll bending forces of seven frames of finish rolling are respectively set as follows: 1209KN, 1200KN, 1194KN, 1200KN, 934 KN.

And 2, step: a calculation module;

and 2.1, receiving the micro-Zhonglang configuration value and the plate shape setting sent by the L2 by using the basic automatic calculation module of L1. And (3) judging that the strip steel is subjected to micro-moderate wave rolling, and reducing the roll bending force given in the plate shape setting issued by L2 according to a roll bending force adjusting configuration difference table (shown in table 2).

2.2 according to the minor median wave configuration value of 30 being greater than 25, find the corresponding roll bending force adjustment amount 320 according to the roll bending force adjustment configuration difference table (as shown in table 2), multiply by attenuation gain 1, and reduce the roll bending force setting in the strip shape setting issued by L2. Therefore, the roll bending force setting of the strip shape after adjustment is as follows: 1209KN, 1200KN, 1194KN, 1200KN, 614 KN.

And step 3: an automation control module;

3.1 before the last frame of the hot continuous rolling finish rolling bites steel, an L1 basic automatic control module controls the strip steel according to the updated plate shape setting calculated in the previous step, namely the roll bending force set according to the adjusted strip steel plate shape: 1209KN, 1200KN, 1194KN, 1200KN, 614KN control strip steel.

3.2 until the last frame of the finish rolling bites steel, the L1 basic automatic control module controls the strip steel according to the plate shape setting issued by the L2, namely the bending roll force setting of seven frames of the finish rolling is respectively as follows: 1209KN, 1200KN, 1194KN, 1200KN, 934KN control strip steel.

Through the steps, the control method for improving the floating of the head of the thin-specification strip steel is realized.

Specific example 2: taking AQ0511K1 of a domestic 1422 hot continuous rolling production line 2.5 x 1023 as an example, the control method for improving the head floating of the thin-specification strip steel is applied to the control of rolling which is not micro-moderate wave and has the following implementation steps:

step 1: a data preparation module;

1.1 configuring a plate shape setting actual performance table (shown in table 1) according to the actual performance of the hot continuous rolling filing rolling, wherein the table is configured with micro-Zhonglang configuration values corresponding to different thickness grades to which the steel tapping marks belong and the specification of the finished strip steel product belongs.

1.2L2 process control system plate model, according to the current steel tapping mark AQ0511K1, the target width thickness 2.5 1023 of strip steel find out the corresponding race 13, thickness grade 104. And reading the micro-Zhonglang configuration value 20 of the plate shape setting actual performance table according to the keywords of the ethnicity 13 and the thickness grade 104.

And a strip shape setting module of the 3.1L 2 process control system calculates the current strip shape setting of seven racks of the strip steel according to the original data of the strip steel at the hot continuous rolling finish rolling inlet, the actually detected incoming material data of temperature, thickness, width and the like, the strip shape self-learning data of the last strip steel, the strip shape requirement target of the finished strip steel and the like. The roll bending forces of the finish rolling seven frames are respectively set as follows: 1203KN, 1000KN, 890KN, 876KN, 784KN, 941 KN.

Step 2: a calculation module;

and 2.1, receiving the micro-Zhonglang configuration value and the plate shape setting sent by the L2 by using the basic automatic calculation module of L1. And (3) judging that the strip steel is not slightly medium wave rolled but the head of the strip steel has medium waves, and reducing the roll bending force given in the plate shape setting issued by L2 after multiplying an attenuation gain value by a roll bending force adjustment configuration difference value table (shown in table 2).

2.2 the strip steel is not rolled by a slight middle wave but the head of the strip steel has a middle wave 14.2, a difference table (shown in table 2) is configured according to the bending roll force adjustment, the middle wave 14.2 is less than or equal to 15, and the corresponding bending roll adjustment amount is as follows: 130, gain, 130, 0.3, 39, the roll bending force setting in the sheet setting issued by L2 is decreased. Therefore, the roll bending force setting of the strip shape after adjustment is as follows: 1203KN, 1000KN, 890KN, 876KN, 784KN, 902 KN.

And step 3: an automation control module;

3.1 before the last frame of the hot continuous rolling finish rolling bites steel, an L1 basic automatic control module controls the strip steel according to the updated plate shape setting calculated in the previous step, namely the roll bending force set according to the adjusted strip steel plate shape: 1203KN, 1000KN, 890KN, 876KN, 784KN, 902KN control the strip steel.

3.2 until the last frame of the finish rolling bites steel, the L1 basic automatic control module controls the strip steel according to the plate shape setting issued by the L2, namely the bending roll force setting of seven frames of the finish rolling is respectively as follows: 1203KN, 1000KN, 890KN, 876KN, 784KN, 941KN control the strip steel.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims

1. A control method for improving the head floating of thin-gauge strip steel is characterized by comprising the following steps:

step 1: the data preparation module prepares;

step 2: the calculation module performs calculation;

and step 3: and the automatic control module controls.

2. The control method for improving the drifting of the head of the thin gauge strip steel according to claim 1, wherein the step 1 data preparation module is used for preparing, and specifically comprises the following steps:

1.1, setting a real performance table according to the hot continuous rolling filing rolling real performance configuration plate shape, wherein the table is configured with micro-Zhonglang configuration values corresponding to different thickness grades to which the steel tapping marks belong and to which the finished strip steel specification belongs, as shown in table 1;

3. The control method for improving the drifting of the head of the thin gauge strip steel according to claim 1, wherein the calculation module in the step 2 performs calculation specifically as follows:

2.2 according to the micro-Zhonglang configuration value, according to the bending force adjustment configuration difference table, as shown in table 2, finding out the corresponding bending force adjustment amount, multiplying the corresponding bending force adjustment amount by an attenuation gain, reducing the bending force given in the strip shape setting issued by L2, and if the roll shape is micro-Zhonglang rolling, taking the attenuation gain as 1;

2.3 if the strip steel is not rolled by the micro-moderate wave, judging whether the head of the strip steel has the moderate wave, if so, adjusting and configuring a difference table according to the bending roller force, multiplying the difference table by an attenuation gain value as shown in the table 2, reducing the bending roller force given in the plate setting issued by L2, and if not rolled by the micro-moderate wave but the head of the strip steel has the moderate wave, taking the attenuation gain value of 0.3;

2.4 if the roll bending force given value in the L2 plate shape setting updated by the L1 basic automatic calculation module is less than the hardware limit, the roll bending force given value is given according to the roll bending force limited by the hardware.

4. The control method for improving the drifting of the head of the thin gauge strip steel according to claim 1, wherein the step 3: the automatic control module specifically comprises the following components: