Rough rolling side guide full-stroke multimode equipment control method

Abstract

The invention relates to the field of rough rolling automatic control. A rough rolling side guide full-stroke multimode equipment control method comprises the steps that a rough rolling inlet and outlet side guide is installed in front of a rough rolling large vertical roll RE and behind a rough rolling flat roll RM and used for lateral guiding and positioning of a plate blank, in the control process of a hot continuous rolling rough rolling side guide, the opening width of the rough rolling inlet and outlet side guide is adjusted according to a current rolling plan, and the opening width of the rough rolling inlet and outlet side guide is adjusted according to the current rolling plan. The opening width of the rough rolling inlet and outlet side guide is controlled according to the steel type and the rough rolling odd-even passes. According to the method, corresponding steel types are flexibly controlled in a targeted mode, the problems of various plate types in the rough rolling process are solved, the deviation phenomenon in the rough rolling process is corrected in time, and the rolling stability of rough rolling vertical roll and flat roll production during rough rolling of an intermediate billet is improved.

Description

Technical Field

[0001] The present invention relates to the field of rough rolling automatic control. Background Art

[0002] In hot rolling production, rough rolling is an extremely important process step. It sends the slab in the furnace area to the finishing mill as an intermediate slab after multi-pass rough rolling. The rough rolling inlet and outlet side guides are used for the lateral guiding and positioning of the slab in the furnace area. Their main functions are slab centering and preventing the slab from running off after passing through the vertical rolls and horizontal rolls.

[0003] The side guide devices are mechanically synchronized. They are driven by a hydraulic cylinder and a lever operating shaft. The hydraulic cylinder is operated by a servo valve with built-in control electronics and an electromagnetic valve electrical feedback. The hydraulic cylinder and the servo valve can be controlled by an electrically driven solenoid valve and a hydraulic pilot valve.

[0004] In the hot rolling production line, after the rough rolling inlet and outlet side guides are opened to the rolling set position after side guide centering, there is no additional side guide correction function. As a result, the current set rolling side guides cannot effectively correct the yaw of the intermediate slab after the slab passes through the vertical rolls and horizontal rolls. This often leads to unstable slab shapes of the intermediate slabs rolled in rough rolling, and often the intermediate slabs show an "S" shape and head and tail sickle bends, greatly affecting the rolling stability of the subsequent finishing rolling process, and very likely causing the slab to run off or bilateral wave phenomena during finishing rolling, and even scrap. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to control the rough rolling inlet and outlet side guides to avoid unstable slab shapes of the intermediate slabs rolled in rough rolling.

[0006] The technical solution adopted by the present invention is: a control method for a rough rolling side guide full-stroke multi-mode device. The rough rolling inlet and outlet side guides are installed before the rough rolling large vertical rolls RE and after the rough rolling horizontal rolls RM, and are used for the lateral guiding and positioning of the slab. During the control process of the rough rolling side guides in hot continuous rolling, the opening width of the rough rolling inlet and outlet side guides is adjusted according to the current rolling plan, that is, the opening width of the rough rolling inlet and outlet side guides is controlled according to the steel grade and the odd or even passes of rough rolling; GSGRef = Wpwed + α + β + X Wherein: GSGRef is the opening width of the rough rolling inlet and outlet side guides, in mm; Wpwed is the width value of the incoming slab, in mm; α is the input opening gap compensation value of the rough rolling inlet and outlet side guides, selected according to different passes, in mm; β is the input side guide width allowance value, in mm; X is the input steel grade compensation value, in mm.

[0007] In the odd roughing passes, when the head of the slab reaches the laser hot metal detector on the inlet and outlet side guides of the roughing mill, the speed of the slab is reduced to 0. The inlet and outlet side guides of the roughing mill start the centering mode, and the opening width of the inlet and outlet side guides of the roughing mill takes the GSGRef value. After centering is completed, the slab advances, and the roughing inlet opening is set to the rolling position. When the roughing flat roll RM bites the steel, that is, after the load relay is ON and delayed for 0.3 seconds, the full-stroke deviation correction function of the inlet and outlet side guides of the roughing mill is started. The opening gap compensation value α of the inlet and outlet side guides of the roughing mill is set to 0 to maintain the pressure balance on both sides of the side guide until the roughing flat roll RM ejects the steel (rolling ends), that is, the load relay is OFF, and the inlet and outlet side guides of the roughing mill are set to the waiting position.

[0008] In the even roughing passes, when the roughing flat roll RM bites the steel, that is, after the load relay is ON and delayed for 0.3 seconds, the speed of the intermediate slab is reduced to 0. The inlet and outlet side guides of the roughing mill start the centering mode, and the opening of the roughing side guides is opened according to the GSGRef value of the opening width of the inlet and outlet side guides of the roughing mill. After centering is completed, the slab advances, the roughing inlet opening is set to the rolling position, the full-stroke deviation correction function of the inlet and outlet side guides of the roughing mill is started, and the opening gap compensation value α of the inlet and outlet side guides of the roughing mill is set to 0 to maintain the pressure balance on both sides of the side guide until the roughing flat roll RM ejects the steel (rolling ends), that is, the load relay is OFF.

[0009] The beneficial effects of the present invention are as follows: The present invention flexibly controls the corresponding steel grades, which not only solves various shape problems in roughing rolling but also timely corrects the deviation phenomenon during the roughing rolling process, improves the rolling stability of the roughing vertical and flat rolls during the rolling of the intermediate slab, eliminates the adverse effects on the subsequent finishing rolling, reduces the scrap steel and fault time on the rolling line, and is of great significance for achieving the goal of cost reduction and efficiency increase, with significant economic benefits and broad prospects for popularization and application. Brief Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the inlet and outlet side guides of the roughing mill of the present invention; Figure 2 It is a schematic diagram of the hydraulic cylinder of the inlet and outlet side guides of the roughing mill of the present invention; Figure 3 It is a schematic diagram of the process of the present invention. Detailed Embodiments

[0011] Such as Figures 1-3As shown in the figure, the side guide devices on the inlet and outlet sides of the rough rolling are mechanically synchronized and operated by a servo valve with built-in control electronics and electromagnetic valve electrical feedback. The hydraulic cylinder and servo valve can be controlled by an electrically driven solenoid valve and a hydraulic pilot valve. When the shut-off valve is closed, the side guide device cannot be opened or closed. The current position of the side guide device is measured by a position encoder installed on the lever operating shaft for feedback of the opening and closing stroke. The current opening and closing set value of the side guide is calculated based on the rolling plan, by adding the width of the slab incoming from the furnace area, the compensation for the opening gap of the inlet and outlet side guides, the additional width allowance of the side guide input on the operation screen, and the compensation set for different steel grades in the L1 program.

[0012] The specific setting formula is as follows: GSGRef = Wpwed + α + β + X Where: GSGRef is the opening width of the side guides on the inlet and outlet sides of the rough rolling, in mm; Wpwed is the width value of the incoming slab, in mm; α is the compensation value for the opening gap of the side guides on the inlet and outlet sides of the rough rolling, selected according to different passes, in mm; β is the additional width allowance value of the side guide, in mm; X is the compensation value for the steel grade, in mm.

[0013] During the rolling process, the side guide width (the opening width of the side guides on the inlet and outlet sides of the rough rolling) will be automatically adjusted to the set position and closed-loop controlled through feedback from the on-site position encoder. If manual intervention is performed during the automatic position control (APC) process, the APC will stop and cannot be completed. The APC will restart when the next APC start signal is received.

[0014] The specific problems to be solved are as follows: When rolling different passes in the rough rolling, the position control of the opening and closing of the head and tail of the side guide is carried out to flexibly adjust the opening size for different steel grades, which can effectively solve the slab shape problems (such as "S" shape and head and tail sickle bends) during the rough rolling feeding process, and improve the width accuracy of the head and tail of the rough rolling feeding, which has a great effect on the stability of the subsequent finishing rolling process; By implementing this control technology, the rough rolling can be centered during the intermediate slab rolling process, preventing deviation, thereby improving product quality and equipment stability.

[0015] Design scheme and algorithm For the full-stroke opening and closing control program technology of the rough rolling side guide, the following algorithm is adopted: When the head of the intermediate billet in the odd roughing passes reaches the hot detector ED23BFZI3 / 4 at the side guide inlet (laser hot metal detector), the speed of the intermediate billet is reduced to 0, the inlet side guide starts the centering mode, the side guide opening is added with the secondary set value (GSGRef), and after centering is completed, the slab advances and the side guide opening is set to the rolling position. After the roughing flat roll bites the steel and the load relay is ON for 0.3 seconds, the full-stroke deviation correction function of the roughing side guide is started, and the compensation value α of the opening gap between the inlet and outlet side guides of the roughing is set to 0 (L1 setting) to maintain the pressure balance on both sides of the side guide until the roughing RM load relay is OFF.

[0016] After 0.3 seconds when the flat roll of the intermediate billet in the even roughing passes bites the steel, the speed of the intermediate billet is reduced to 0, the inlet side guide starts the centering mode, the side guide opening is added with the secondary set value, and after centering is completed, the slab advances and the side guide opening is set to the rolling position. The outlet side guide starts the full-stroke deviation correction function mode of the roughing side guide, and the side guide opening is closed to the B value (L1 setting) to maintain the pressure balance on both sides of the side guide until the roughing RM load relay is OFF.

[0017] In order to enable flexible control of the side guide during rolling, according to the on-site rolling state, a correction function for the rolling opening margin of the side guide is added to the program, and an operation sub-screen is made on the roughing main screen.

[0018] When roughing starts rolling, when it is an odd pass, after the hot detector BFZIED23 1 / 2 at the inlet side guide of the roughing (laser hot metal detector) detects, the side guide reaches the side guide centering waiting position. After centering is completed, the side guide opens to the rolling waiting position. 0.3 seconds after the load relay detects when the intermediate billet reaches the roughing RM, the side guide rolling position value is corrected by adding or subtracting according to the steel grade code set by L2 until the end of this pass; when it is an even pass, after the hot detector BFZI EE20 3 / 4 at the outlet side guide of the roughing (laser hot metal detector) detects, the side guide is set to the side guide rolling waiting position. 0.3 seconds after the load relay detects when the intermediate billet reaches the roughing RM, the side guide rolling position value is corrected by adding or subtracting according to the steel grade code set by L2 until the end of this pass. The above steps are repeated until the roughing rolling ends.

[0019] After the hot coiling box on the rolling line of the hot strip mill of Taiyuan Iron and Steel uses this technical solution, the effects are as follows: 1. Before the project was put into use, taking the six months from June 2024 to December 2024 as an example, on average, 3 pieces of scrap steel were generated per month due to abnormal head and tail shapes in roughing, and 3 pieces of scrap steel were generated in finishing rolling due to poor shape of the roughing incoming material. And for each piece of scrap steel, the failure time caused was about 20 minutes. Calculated according to 2.5 minutes for each piece of steel rolled, so about pieces of steel were reduced in production per month. A total of 48 pieces of steel were reduced in production per month. Calculated at 25 tons per piece of steel and 200 yuan per ton of steel, the annual equivalent is: 12×48×25×2000=2880000 yuan 2. By implementing this control technology, the shape of the intermediate slab during rough rolling feeding (such as the problems of "S" shape and head and tail sickle bends) is effectively solved, and the width accuracy of the head and tail of the rough rolling feeding is improved, which has a great effect on the stability of the finishing rolling process in the next process; 3. Since the launch of this project, it has enabled the rough rolling to remain centered during the intermediate slab rolling process, preventing deviation, thus greatly improving the product quality and the stability of the equipment.

[0020] The present invention makes full use of the advanced and operable characteristics of computer control technology. During the control process of the side guides on the rough rolling side of hot continuous rolling, multi-mode position control of the side guides at the inlet and outlet of the rough rolling during the odd and even passes of rough rolling is carried out, that is, when rough rolling different passes, the position control of the head and tail opening degrees of the side guides is carried out to achieve flexible adjustment of the opening degree size for different steel grades, which can not only effectively solve the shape of the intermediate slab during rough rolling feeding (such as the problems of "S" shape and head and tail sickle bends), but also improve the width accuracy of the head and tail of the rough rolling feeding, which has a great effect on the stability of the finishing rolling process in the next process; and enables the intermediate slab to remain centered during the rolling process, preventing deviation, thus improving the product quality and the stability of the equipment.

Claims

1. A control method for a roughing side guide full-stroke multi-mode device, characterized in that: The roughing infeed and outfeed side guides are installed before the roughing large vertical roll RE and after the roughing horizontal roll RM, and are used for the lateral guiding and positioning of the slab. During the control process of the roughing side guides in hot strip continuous rolling, the opening width of the roughing infeed and outfeed side guides is adjusted according to the current rolling plan, that is, the opening width of the roughing infeed and outfeed side guides is controlled according to the steel grade and the odd or even passes of roughing; GSGRef = Wpwed + α + β + X Where: GSGRef is the opening width of the roughing infeed and outfeed side guides, in mm; Wpwed is the width value of the incoming slab, in mm; α is the input opening gap compensation value of the roughing infeed and outfeed side guides, selected according to different passes, in mm; β is the input side guide width allowance value, in mm; X is the input steel grade compensation value, in mm.

2. The multi-mode equipment control method for the full stroke of the roughing side guide according to claim 1, wherein: In the odd passes of roughing, when the head of the slab reaches the laser hot metal detector of the roughing infeed and outfeed side guides, the slab speed is reduced to 0, the roughing infeed and outfeed side guides start the centering mode, the opening width of the roughing infeed and outfeed side guides takes the GSGRef value. After centering is completed, the slab advances, and the roughing inlet opening is set to the rolling position. When the roughing horizontal roll RM bites the steel, that is, after the load relay is ON and delayed for 0.3 seconds, the full-stroke deviation correction function of the roughing infeed and outfeed side guides is started, and the opening gap compensation value α of the roughing infeed and outfeed side guides is set to 0 to keep the pressure balance on both sides of the side guides until the roughing horizontal roll RM ejects the steel (rolling ends), that is, the load relay is OFF, and the roughing infeed and outfeed side guides are set to the waiting position.

3. A control method for a roughing side guide full-stroke multi-mode device according to claim 1, characterized in that: In the even passes of roughing, when the roughing horizontal roll RM bites the steel, that is, after the load relay is ON and delayed for 0.3 seconds, the speed of the intermediate slab is reduced to 0, the roughing infeed and outfeed side guides start the centering mode, and the opening of the roughing side guides is opened according to the opening width GSGRef value of the roughing infeed and outfeed side guides. After centering is completed, the slab advances, the roughing inlet opening is set to the rolling position, the full-stroke deviation correction function of the roughing infeed and outfeed side guides is started, and the opening gap compensation value α of the roughing infeed and outfeed side guides is set to 0 to keep the pressure balance on both sides of the side guides until the roughing horizontal roll RM ejects the steel (rolling ends), that is, the load relay is OFF.

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