阅读说明：本技术 一种热轧薄规格集装箱用spa-h钢边部浪形的控制方法 (Control method of SPA-H steel edge wave shape for hot-rolled thin-specification container ) 是由 关建辉 丁美良 钱京学 曲锦波 孙林 于 2021-06-26 设计创作，主要内容包括：本申请公开了一种热轧薄规格集装箱用SPA-H钢边部浪形的控制方法,基于热轧凸度反馈控制APC模型,其特征在于：包括：一级控制模型设置有控制开关、钢种判断、厚度判断以及凸度PDI目标与模型计算比较判断；二级控制模型计算凸度值与PDI凸度目标值比较,来动态调节APC控制目标。本发明通过优化轧制模型达到改善薄规格SPA-H钢边部浪形目的,提高热轧薄规格集装箱用SPA-H钢的板形质量,具有良好的经济效益。(The application discloses control method of hot rolling thin specification SPA-H steel edge wave shape for container, based on hot rolling convexity feedback control APC model, its characterized in that: the method comprises the following steps: the primary control model is provided with a control switch, steel grade judgment, thickness judgment and convexity PDI target and model calculation comparison judgment; and the second-level control model calculates a convexity value to be compared with a PDI convexity target value so as to dynamically adjust the APC control target. The invention achieves the purpose of improving the wave shape of the thin SPA-H steel edge by optimizing the rolling model, improves the plate shape quality of the SPA-H steel for the hot rolling thin container and has good economic benefit.)

1. A control method of SPA-H steel edge wave shape for hot rolling thin-specification container is based on hot rolling convexity feedback control APC model, and is characterized in that: the method comprises the following steps: the primary control model is provided with a control switch, steel grade judgment, thickness judgment and convexity PDI target and model calculation comparison judgment; the secondary control model calculates the convexity value of the steel grade and compares the convexity value with a PDI target convexity value, and if the absolute value of the difference between the convexity value calculated by the secondary control model and the PDI target convexity value is less than or equal to 10 micrometers, the convexity value calculated by the secondary control model is used as a control target for APC convexity feedback regulation; if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is less than-10 μm, subtracting 10 μm from the target convexity value of the PDI to be used as a control target for APC convexity feedback regulation; and if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is more than 10 mu m, taking the sum of the target convexity value of the PDI and 10 mu m as the control target of the APC convexity feedback regulation.

2. The method for controlling the wave shape of the edge of the SPA-H steel for the hot-rolled thin-gauge container according to claim 1, wherein the method comprises the following steps: and judging whether the steel grade is SPA-H steel or not by the primary control model steel grade.

3. The method for controlling the wave shape of the edge of the SPA-H steel for the hot-rolled thin-gauge container according to claim 1, wherein the method comprises the following steps: and judging the thickness of the primary control model to judge whether the thickness of the steel grade is 1.5-3.0 mm.

4. The method for controlling the wave shape of the edge of the SPA-H steel for the hot-rolled thin-gauge container according to claim 1, wherein the method comprises the following steps: further comprising: and the hot rolling crown feedback control APC model adjusts the roll bending force overrun locking time of the downstream frames F4, F5 and F6 to be set to be 3-5 s.

5. The method for controlling the wave shape of the edge of the SPA-H steel for the hot-rolled thin-gauge container according to claim 1, wherein the method comprises the following steps: further comprising: optimizing the APC convexity to adjust the gain of each rack, wherein the adjusting proportionality coefficient of F1-F3 is 1300-1500, the adjusting proportionality coefficient of F4-6 is 1100-1200, and the adjusting proportionality coefficient of F7 is 1000.

Technical Field

The application relates to the technical field of hot rolling, in particular to a control method of SPA-H steel edge wave shape for a hot-rolled thin-specification container.

Background

In the production of hot-rolled strip steel, the strip shape problem is an important aspect of the strip quality. The SPA-H steel is atmospheric corrosion resistant structural steel, executes standard JIS 3125-2004, and is mainly used for manufacturing shipping containers, wherein the thin-gauge container plates are mainly used for manufacturing container panels and the like. When the SPA-H alloy element content is high and the rolling force is large when the thin gauge is rolled, the roll deflection is large, the poor plate shape is easy to appear, and the edge wave is mainly shown. Poor plate shape of the thin container plate, such as edge wave shape defects, requires finishing by a leveling line, and increases production cost.

The factors influencing the edge wave shape of the hot-rolled strip steel are many, and the factors such as rolling planning, roller shape, rolling load distribution, convexity feedback model, roll bending force feedforward setting, cooling and the like are all important factors influencing the edge wave shape of the hot-rolled strip steel.

The rolled thin SPA-H structural steel has high alloy element content and large rolling force, particularly the middle and rear parts of strip steel, the temperature drop of the strip steel causes large actual rolling force, the problem of wave shape at the edge of the strip steel is easy to occur, but the tension of the strip steel is established at the moment, the wave shape is invisible, operators are difficult to make corresponding adjustment, and the double-side wave is serious after uncoiling after rolling.

APC (automatic Profile feedback control) is mainly characterized in that in the process of rolling a certain coil of steel, the convexity deviation is obtained by comparing the convexity value detected by a convexity meter at the finish rolling outlet in real time with a given target value, then the convexity deviation value is distributed to each rack of a finishing mill according to the equal proportion principle, and a PI (proportional integral) controller is adopted to dynamically adjust the bending roll force of each rack.

The APC convexity control target is generally a single PDI (Primary Data input) convexity target value, the hot convexity of the roller rises in the middle and later stages of a rolling plan of the steel for the thin-specification container, the calculated convexity of the secondary model is reduced, the difference value between the PDI convexity target value and the calculated convexity of the secondary model is obviously increased, the APC convexity control can reduce the roller bending force, the temperature of the middle part and the tail part of the middle blank of the rolled thin-specification container plate is reduced greatly, the rolling force rises, the deflection of the roller is increased, and multiple factors are coupled, so that the edge wave shape is easily caused, and the plate shape defect is formed. Aiming at solving the problem, the invention provides a hot-rolled thin-specification container plate edge wave shape control method based on APC convexity regulation and control target dynamic adjustment.

Disclosure of Invention

The present invention aims to provide a solution to the deficiencies of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a control method of SPA-H steel edge wave shape for a hot rolling thin-specification container is based on hot rolling convexity feedback control APC model, and comprises the following steps: the primary control model is provided with a control switch, steel grade judgment, thickness judgment and convexity PDI target and model calculation comparison judgment; the secondary control model calculates the convexity value of the steel grade and compares the convexity value with a PDI target convexity value, and if the absolute value of the difference between the convexity value calculated by the secondary control model and the PDI target convexity value is less than or equal to 10 micrometers, the convexity value calculated by the secondary control model is used as a control target for APC convexity feedback regulation; if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is less than-10 μm, subtracting 10 μm from the target convexity value of the PDI to be used as a control target for APC convexity feedback regulation; and if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is more than 10 mu m, taking the sum of the target convexity value of the PDI and 10 mu m as the control target of the APC convexity feedback regulation.

Preferably, the primary control model steel grade is judged to judge whether the steel grade is SPA-H steel or not

Preferably, the thickness of the primary control model is judged to judge whether the thickness of the steel grade is 1.5-3.0 mm.

Preferably, the method further comprises the following steps: and the hot rolling crown feedback control APC model adjusts the roll bending force overrun locking time of the downstream frames F4, F5 and F6 to be set to be 3-5 s.

Preferably, the method further comprises the following steps: optimizing the APC convexity to adjust the gain of each rack, wherein the adjusting proportionality coefficient of F1-F3 is 1300-1500, the adjusting proportionality coefficient of F4-6 is 1100-1200, and the adjusting proportionality coefficient of F7 is 1000.

Compared with the prior art, the control method for the edge wave shape of the SPA-H steel for the hot-rolled thin container can improve the edge wave shape of the SPA-H steel by optimizing the rolling model and the process, improve the plate shape quality of the SPA-H steel for the hot-rolled thin container, effectively solve the problem of unstable threading of hot-rolled strip steel, and has good economic benefit and social benefit.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flowchart of a method for controlling the edge wave shape of SPA-H steel for a hot rolled thin container according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In order to achieve the above purpose, as shown in fig. 1, the following technical solutions are adopted in the present invention: a control method for the wave shape of the edge of SPA-H steel for hot rolling thin containers is mainly realized by optimizing a rolling model. The method specifically comprises the following steps:

(1) and adding a dynamic adjustment scheme to the APC convexity feedback control target to realize the dynamic adjustment of the APC convexity feedback target. The specific implementation method comprises the following steps: the primary program is sequentially provided with a control switch, steel grade judgment, thickness judgment, convexity PDI target and model calculation comparison judgment so as to realize control aiming at specific steel grades and thickness specifications.

The comparison and judgment of the convexity PDI target and the model calculation are carried out according to the following criteria: if the absolute value of the difference between the calculated value of the convexity of the secondary model and the target convexity of the PDI is less than or equal to 10 mu m, taking the calculated value of the convexity of the secondary model as a control target for APC convexity feedback regulation; the purpose is to ensure the good flatness of the strip steel.

If the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is less than-10 μm, subtracting 10 μm from the target convexity value of the PDI to be used as a control target for APC convexity feedback regulation; the purpose is to slightly increase the convexity and avoid the low convexity hit rate on the premise of ensuring the flatness as much as possible.

And if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is more than 10 mu m, taking the sum of the target convexity value of the PDI and 10 mu m as the control target of the APC convexity feedback regulation. The purpose is to slightly reduce the convexity on the premise of ensuring the flatness as much as possible so as to avoid the over-low convexity hit rate.

(2) And adjusting the roll bending force overrun locking time of the downstream F4, F5 and F6 frames to be set at 0-3 s. The locking time after the roller bending force exceeds the limit is reduced, and the adjusting frequency is accelerated.

(3) The APC convexity is optimized to adjust the gain of each rack, F1-F3 is 1300-1500, F4-6 is 1100-1200, and F7 is 1000.

And the APC target convexity dynamic adjustment scheme is matched, the convexity adjusting and controlling capability of the upstream frame is improved, the flatness is ensured to be good, and meanwhile, the gain of the downstream frame is properly reduced.

Example 1

The invention discloses a control method of SPA-H steel edge wave shape for hot rolling thin container, taking SPA-H steel coil with thickness less than or equal to 3.0mm produced by 1450 hot rolling line as an example, which comprises the following concrete steps:

(1) and adding a dynamic adjustment scheme to the APC convexity feedback control target to realize dynamic adjustment of the convexity feedback target. The specific implementation method comprises the following steps: the primary program is sequentially provided with a control switch, steel grade judgment, thickness judgment, convexity PDI target and model calculation comparison judgment so as to realize control aiming at specific steel grades and thickness specifications. The comparison and judgment of the convexity PDI target and the model calculation are carried out according to the following criteria: if the absolute value of the difference between the calculated value of the convexity of the secondary model and the target convexity of the PDI is less than or equal to 10 mu m, taking the calculated value of the convexity of the secondary model as a control target for APC convexity feedback regulation; if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is less than-10 μm, subtracting 10 μm from the target convexity value of the PDI to be used as a control target for APC convexity feedback regulation; similarly, if the difference between the calculated value of the convexity of the secondary model and the target value of the convexity of the PDI is greater than 10 μm, the target value of the convexity of the PDI plus 10 μm is used as the control target for the feedback regulation of the convexity of the APC.

(2) The downstream F4, F5, and F6 frame bending force overrun lock time was set to 3 s.

(3) The optimized APC convexity adjusts the gain of each frame, F1-F3 is 1200, F4-6 is 1100, and F7 is 1000.

(4) Through detection, the proportion convexity of the SPA-H steel coil finished product with the thickness less than or equal to 3.0mm is 1.0-1.15%, and the ratio of the steel coil with poor shape caused by edge wave shape to the total number of the steel coils is 0.30%.

Example 2

The invention relates to a control method of SPA-H steel edge wave shape for a hot rolling thin container, taking an SPA-H steel coil with the thickness less than or equal to 3.0mm produced by a 1450 hot rolling line as an example, and specifically sequentially comprising the following steps: (1) and adding a dynamic adjustment scheme to the APC convexity feedback control target to realize dynamic adjustment of the convexity feedback target. The specific implementation method comprises the following steps: the primary program is sequentially provided with a control switch, steel grade judgment, thickness judgment, convexity PDI target and model calculation comparison judgment so as to realize control aiming at specific steel grades and thickness specifications. The comparison and judgment of the convexity PDI target and the model calculation are carried out according to the following criteria: if the absolute value of the difference between the calculated value of the convexity of the secondary model and the target convexity of the PDI is less than or equal to 10 mu m, taking the calculated value of the convexity of the secondary model as a control target for APC convexity feedback regulation; if the difference between the calculated convexity value of the secondary model and the target convexity value of the PDI is less than-10 μm, subtracting 10 μm from the target convexity value of the PDI to be used as a control target for APC convexity feedback regulation; similarly, if the difference between the calculated value of the convexity of the secondary model and the target value of the convexity of the PDI is greater than 10 μm, the target value of the convexity of the PDI plus 10 μm is used as the control target for the feedback regulation of the convexity of the APC.

(2) The downstream F4, F5, and F6 frame bending force overrun lock time was set to 5 s.

(3) And optimizing the APC convexity to adjust the gain of each rack, wherein F1-F3 is 1500, F4-6 is 1200, and F7 is 1000.

(4) Through detection, the proportion convexity of the SPA-H steel coil finished product with the thickness less than or equal to 3.0mm is 1.10-1.25%, and the ratio of the steel coil with poor shape caused by edge wave shape to the total number of the steel coils needing to be finished is 0.59%.

Comparative examples

The production is carried out according to a conventional hot rolling convexity feedback control APC model, taking an SPA-H steel coil with the thickness less than or equal to 3.0mm produced by a 1450 hot rolling line as an example, the production method specifically comprises the following steps:

(1) APC convexity feedback control is the PDI convexity target.

(2) The roll bending force overrun lock time of the downstream F4, F5 and F6 frames was set at 15 s.

(3) The APC convexity adjustment gain settings for each rack are 1000.

(4) Through detection, the proportion convexity of the SPA-H steel coil finished product with the thickness less than or equal to 3.0mm is 1.3-3.0%, and the ratio of the steel coil with poor shape caused by edge wave shape to the total number of the steel coils needing to be finished is 9.70%.

Compared with the prior art, the method for controlling the edge wave shape of the SPA-H steel for the hot-rolled thin-specification container has the advantages that the ratio of the steel coil which is poor in shape and needs to be finished to the total steel coil is greatly reduced to be below 1.0%, the quality of the hot-rolled strip steel is improved, the expected effect is achieved, and good economic benefits are generated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a detailed description of the present application, and it should be noted that modifications and embellishments could be made by those skilled in the art without departing from the principle of the present application, and these should also be considered as the protection scope of the present application.