CN112404141B - Effective method for solving indentation problem of hot rolling coiling - Google Patents
Effective method for solving indentation problem of hot rolling coiling Download PDFInfo
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- CN112404141B CN112404141B CN202011127911.2A CN202011127911A CN112404141B CN 112404141 B CN112404141 B CN 112404141B CN 202011127911 A CN202011127911 A CN 202011127911A CN 112404141 B CN112404141 B CN 112404141B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
Abstract
The invention discloses an effective method for solving the indentation problem of hot rolling coiling, and relates to a method specially suitable for the control technology of a metallurgical hot rolling strip steel coiling machine. The problem of current control scheme can't thoroughly eliminate the head indentation all the time is solved.
Description
Technical Field
The invention relates to the technical field of control of a metallurgical hot rolled strip steel coiler, in particular to an effective method for solving the indentation problem of hot rolled coiled strip steel.
Background
The 2250mm hot rolled leading product of the metal manufacturing company is a high-quality rare earth hot rolled coil, and the special product is high-strength steel such as pipeline steel and the like. The tensile strength of the high-strength steel can reach 1200MPa, and the highest grade of the pipeline steel is X100. The product is positioned as a high-added-value fine plate, is widely applied to industries such as ships, automobiles, bridge buildings, mechanical manufacturing, pressure vessels, petrochemical equipment, electrical equipment, pipeline transportation and the like, and particularly, the pipeline steel is a main material for the construction of large-scale transportation engineering such as western gas and east gas transportation.
With the large application of hot-rolled coils and the production increase of large-scale factory building, the requirement of customers on the quality of the hot-rolled coils is continuously improved. In the quality problems reflected by customers on the products of our factory in recent years, the indentation of the hot-rolled coil is a great quality defect problem which is proposed for many times, and can directly lead the price rating of the products delivered by our factory to be degraded, so that the credit rating of our factory in the industry is degraded.
In recent years, a plurality of enterprises in the metallurgical and steel rolling industries make great progress on the attack of the indentation problem, but the indentation problem cannot be completely solved.
Patent CN 103223420a discloses "a method and system for controlling indentation of inner ring of hot rolled steel coil", a coiling temperature measuring device is arranged in front of a coiling unit, a primary computer is provided with a coiling moment setting unit, a coiling moment feedback unit, a delay setting unit and a delay timer; calculating and setting a coiling torque according to a coiling torque parameter of the strip steel, setting a pressurizing delay time of a wrapper roll according to a slip characteristic parameter of the strip steel, and starting pressurizing delay timing when the set coiling torque is reached; after the time delay is finished, opening the wrapper roll and stopping pressurizing, so that the contact pressure and time of the wrapper roll and the strip steel are minimized, and the coiling moment parameters are preferably the width, the thickness and the thermal yield strength of the strip steel; the slip characteristic parameters are preferably the width of the strip, the coiling temperature and the thickness. The method has the defects that the solution shortens the pressurizing time of the wrapper roll on the outer surface of the band steel, weakens the pressing function of the wrapper roll for assisting in coiling, simultaneously does not consider the impact problem caused by inaccurate head tracking of the band steel, and cannot deeply analyze the reason for eliminating the indentation, so that the indentation cannot be eliminated fundamentally.
Patent CN 105665452a discloses a method for eliminating indentation on the head of a hot-rolled strip steel, which utilizes load correction to correct head tracking when the head of the strip steel passes through a pinch roll and three wrapper rolls in turn in the first turn, wherein the correction formula is S ═ V × t + Sx, S is the head tracking distance, V is the strip steel speed, t is the running time, Sx is the distance correction value, and Sx is 30,35,37,40,41 or 43. The method has the disadvantages that the compensation correction mode does not take into account that in actual production, the force value feedback signal is fluctuated by unexpected impact sometimes, so that wrong correction tracking is caused.
Patent CN 104874639a discloses "a dynamic control method for the roll gap of the auxiliary winding roll of the coiling machine", which makes the auxiliary winding roll keep a light set pressure and controls the roll gap of the auxiliary winding roll to open dynamically and synchronously with the increase of the winding layers and the expansion of the winding drum on the premise of ensuring no slip accident according to the steel type, thickness and temperature of the strip steel, so that the arc indentation defect of the inner ring of the hot rolled steel coil with all thickness is kept at a light degree all the time. The method has the defects that the setting of the jump-out value of the wrapper roll completely depends on calling a static parameter table, the large feedback deviation caused by the influence of the equipment precision, the yield strength of strip steel and the material characteristics in the actual production is not considered, the control mode is rigid, and a closed loop is not formed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an effective method for solving the indentation problem of hot rolling coiling, and the indentation problem of hot rolling coiling is effectively eliminated.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to an effective method for solving the indentation problem of hot rolling coiling, which adopts a main body device of a hot rolling coiler control system, and comprises a mandrel part, a pinch roll part and a wrapper roll part, wherein the mandrel part is provided with a position sensor for detecting the diameter, the wrapper roll part is provided with a pressure sensor for detecting the load and a position sensor for detecting the position, the feedback value of the sensors is used for tracking calculation, then the number of turns is calculated and updated in real time through tracking data, the tracking data and the number of turns are updated to be used as a time sequence reference for gradually carrying out coiling control, a series of compensation and correction calculation schemes are designed according to different target thicknesses of strip steel by mainly utilizing loading feedback signals of the pinch roll and the wrapper roll, and the compensation and correction calculation schemes comprise correcting the tracking data of the head part of the strip steel, compensating the trip value of the wrapper roll, calculating the number of the correction turns, optimizing the time sequence of the pressing switching force control of the wrapper roll, The setting of the pressing force of the wrapper roll is optimized, and the phenomena of indentation caused by forward sliding of the head of the strip steel, advanced force control of the wrapper roll and impact of the strip steel on the wrapper roll are avoided.
Further, the method specifically comprises the following steps:
s1 correction of tracking data of strip steel head
S1.1, pinch roll tracking correction: before leaving the finishing mill and entering a coiler, the head of the strip steel passes through a hot metal detector to trigger a preparation signal; then triggering head tracking calculation through a cold metal detector; the strip steel head passes through a pinch roll, the pinch roll triggers a loading signal through force value feedback, and tracking data is corrected in time according to the formula SPR ', wherein the SPR is an instantaneous tracking value before correction, the SPR' is an instantaneous tracking value after correction, and the angle is SPR-H1, wherein H1 is the distance from the position right below a metal detector to the lower pinch roll;
s1.2, first-circle tracking correction of the wrapper roller: taking the first wrapper roll as an example, when the head of the strip steel reaches the first wrapper roll, triggering the first wrapper roll to load a signal through force value feedback, and correcting the tracking data in time according to the formula SWR 1' ═ SWR 1-Delta 1; wherein S WR1 is the instantaneous tracking value before correction, S WR 1' is the instantaneous tracking value after correction, Δ 1 is S WR 1-H2, H2 is the distance from the position right below the cold metal detector to the first wrapper roll.
S1.3, correcting the forward slip before tracking of the wrapper roller: after the mandrel expands, the change of the central diameter of the steel coil leads the actual position of the head of the strip steel to lag behind tracking data, and the phenomenon of head tracking calculation forward slip is generated, and the tracking forward slip correction is needed; when the number of turns feedback value n is equal to m, wherein n is equal to 3, 4, 5 …, m is equal to mandrel expansion number of turns setting value + x, m is equal to wrapper roll opening number, x is the forward slip correction timing point parameter, and x is equal to 1, 2, 3 …, according to the formula: correcting the tracking with head once, wherein the tracking after correction L is the tracking before correction L (1-forward slip correction coefficient e);
s2. feed-forward compensation of jump-off value of auxiliary winding roller
When the number of turns is updated from n-2 to n-1 turns and the rising edge of the unwinding signal of the auxiliary winding roller is triggered, the current roller gap value g of the auxiliary winding roller is stored; when the number of turns is updated from n-1 to n turns in feedback, the compensation of the unwinding value of the wrapper roll is triggered, and finally the formula is obtained: giving a roll opening value of (1+ f) + g as a thickness, recalculating compensation, and issuing to execute;
s3, compensating process parameters
S3.1, delay compensation of a position control shear force control critical value point: according to the calculation of the tracking data, starting from the second circle, when the head of the strip steel arrives, the auxiliary winding roller is switched from a position control mode to a pressure control mode, and is pressed against the surface of the steel coil and applies pressure;
3.2 compensation of the pressure of the wrapper roller: the auxiliary winding roller pressing force compensation value table is designed according to different thicknesses, when the pressing force issued by the upper level is found to be improper by the craft, the pressing force issued by the upper level can be compensated and then executed, and meanwhile, the compensation parameter table can be adjusted by the craft at any time according to the requirement.
Further, in step S1.2, different thicknesses are matched to different trigger values.
Further, in the step S1.2, in order to avoid the false triggering phenomenon and the resulting false correction, the triggering correction has a protection range, and when the tracking value | H2-S WR1| is less than or equal to the protection compensation value a, the correction at the position of the wrapper roller is allowed to be triggered; when the tracking numerical value | H3-S WR2| is less than or equal to the protection compensation value b, the correction at the position of the secondary wrapper roller is allowed to be triggered; when the tracking numerical value | H4-S WR3| is less than or equal to the protection compensation value c, the correction at the position of the third wrapper roller is allowed to be triggered; h3 is the distance from the lower part of the cold metal detector to the second wrapper roller, and H4 is the distance from the lower part of the cold metal detector to the third wrapper roller.
Further, in step S3.1, according to the process requirements, a compensation value list is designed for different thicknesses, the switching control critical point is compensated, switching can be advanced or delayed, the roll shape is optimized, indentation is avoided, and meanwhile, a process worker can adjust the compensation value list at any time according to the change of the requirements.
Compared with the prior art, the invention has the beneficial technical effects that:
the coiling control system of the hot-rolled strip steel, which uses the effective method for solving the indentation problem of hot-rolled coiling, can obviously eliminate the indentation defect of the inner ring of the strip steel with the thickness of 3-22mm, can prevent the false correction caused by the false triggering of the loading signal of the wrapper roll due to the reasons of unstable equipment state and the like by setting the protection range, and avoids the occurrence of steel piling accidents. The indentation phenomenon before the uncoiling condition of the front part of the existing strip steel is compared with the indentation phenomenon before transformation: before transformation, the steel coils for the pipeline steel pipes have batch defects that 1-4 parallel strip-shaped transverse indentations are arranged at the position, 2.4-2.5 meters away from the head of the steel coil, in the steel coils, the depth is 0.3-1.5 mm, the length penetrates through the whole plate surface, and the position is basically fixed; after transformation, the front part of the strip steel is smooth, no impression or contusion is caused visually, and no concave-convex feeling is caused by hand touch, which is shown in figure 6.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a flow chart of an effective method of the present invention for solving the hot rolling coil indentation problem;
FIG. 2 is a flowchart of the head tracking correction of the strip steel in the present invention;
FIG. 3 is a flow chart of the compensation process for the unwinding value of the wrapper roll in the present invention;
FIG. 4 is a flow chart of the delay compensation of the critical value point of the level-controlled shear force control according to the present invention;
FIG. 5 is a flow chart of the compensation of the pressing force of the wrapper roller in the present invention;
FIG. 6 is a schematic diagram showing the comparison of uncoiling conditions of the front part of strip steel before and after reforming;
figure 7 is a schematic comparison of the mandrel before and after expansion.
Detailed Description
As shown in FIGS. 1 to 5, an effective method for solving the indentation problem in hot-rolled coil
S1, correcting tracking data of strip steel head
S1.1 Pinch Roll (PR) tracking correction: before the head of the strip steel leaves the finishing mill and enters a coiler, the head of the strip steel firstly passes through a Hot Metal Detector (HMD) to trigger a preparation signal; then triggering head tracking calculation through a Cold Metal Detector (CMD); the strip steel head passes through a pinch roll, the pinch roll triggers a loading signal through force value feedback, and tracking data is corrected in time according to the formula SPR ', wherein the SPR is an instantaneous tracking value before correction, the SPR' is an instantaneous tracking value after correction, the delta-SPR-2640 mm is measured, and the distance from the position right below a cold metal detector to a lower pinch roll is measured by 2640 mm.
S1.2, tracking and correcting the first turn of the Wrapper Roller (WR): taking the first wrapper roll as an example, when the head of the strip steel reaches the first wrapper roll, a loading signal of the first wrapper roll is triggered through force value feedback (different thicknesses are matched with different trigger values), and tracking data is corrected in time according to the formula SWR1 ═ SWR 1-Delta 1. Wherein S WR1 is the instantaneous tracking value before correction, S WR 1' is the instantaneous tracking value after correction, Delta 1 is S WR 1-6313 mm, the distance from the position right below the cold metal detector to the first wrapper roller is 6313mm, the distance from the position right below the cold metal detector to the second wrapper roller is 7028mm, and the distance from the position right below the cold metal detector to the third wrapper roller is 7743 mm. However, in order to avoid the phenomenon of false triggering and cause false correction, the triggering correction has a protection range, and when the tracking value |6313mm-S WR1| is less than or equal to the protection compensation value a, the correction at the position of the wrapper roller I is allowed to be triggered; when the tracking numerical value |7028mm-S WR2| is less than or equal to the protection compensation value b, the correction at the position of the secondary wrapper roller is allowed to be triggered; when the tracking value |7743mm-S WR3| ≦ protection compensation value c, the correction at the wrapper roller III is allowed to be triggered.
S1.3, correcting the forward slip of the Wrapper Roller (WR) in a tracking way: as shown in fig. 7, after the mandrel expands, the change of the central diameter of the steel coil causes the actual position of the head of the strip steel to lag behind the tracking data, and the phenomenon of head tracking and calculation forward slip is generated, so that the forward slip during tracking needs to be corrected. When the number of turns feedback value n is equal to m (note n is equal to 3, 4, 5 …, m is equal to mandrel expansion number of turns set value + x, m is the wrapper roll opening number of turns, x is the forward slip correction timing point parameter, and x is equal to 1, 2, 3 …), according to the formula: the corrected track L ═ corrected track L — (1 — forward slip correction coefficient e), corrects the primary tape head track.
S2, forward feed compensation of trip value of Wrapper Roll (WR)
When the number of turns is updated from n-2 to n-1 turns and the rising edge of the wrapper roll tripping signal is triggered at the same time, the current wrapper roll gap value g is stored; when the number of turns is updated from n-1 to n turns, the compensation of the unwinding value of the wrapper roll is triggered (different unwinding value coefficients f can be automatically matched according to the target thickness), and finally the calculation formula is adopted: and giving a roll jumping value of the wrapper roll to be thickness (1+ f) + g, recalculating and compensating, and then sending out the execution.
S3, compensating process parameters
S3.1 bit-controlled shear force control critical value point delay compensation: and calculating according to the tracking data, starting from the second turn, and before the head of the strip steel arrives, switching the position control mode of the auxiliary winding roller into the pressure control mode, and pressing and applying pressure to the surface of the steel coil. According to the process requirements, a compensation value list is designed according to different thicknesses, the critical point for controlling switching is compensated, switching can be advanced or delayed, the roll shape is optimized, indentation is avoided, and meanwhile, a craft worker can adjust the compensation value list according to the change of the requirements at any time.
S3.2, compensation of the pressure of the wrapper roller: the auxiliary winding roller pressing force compensation value table is designed according to different thicknesses, when the pressing force issued by the upper level is found to be improper by the craft, the pressing force issued by the upper level can be compensated and then executed, and meanwhile, the compensation parameter table can be adjusted by the craft at any time according to the requirement.
Examples analysis
The method is implemented on a 2250mm hot rolling production line of a metal manufacturing company under Baotou Steel Limited liability company in 12 months in 2019, and the specific parameter settings are shown in tables 1 to 3, so that hot rolled steel strips with the thickness of 3 to 22mm are produced.
The indentation phenomenon before the uncoiling condition of the front part of the existing strip steel is compared with the indentation phenomenon before transformation: before transformation, the steel coils for the pipeline steel pipes have batch defects that 1-4 parallel strip-shaped transverse indentations are arranged at the position, 2.4-2.5 meters away from the head of the steel coil, in the steel coils, the depth is 0.3-1.5 mm, the length penetrates through the whole plate surface, and the position is basically fixed; after transformation, the front part of the strip steel is smooth, no indentation or contusion is caused visually, and the strip steel does not have concave-convex feeling when touched by hands, as shown in figure 6.
TABLE 1 number one auxiliary winding roller
TABLE 2 wrapper roll
TABLE 3 auxiliary winding roller
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. An effective method for solving the indentation problem of hot-rolling coiled coil includes such steps as providing a control system for the hot-rolling coiled coil, including a mandrel unit with a position sensor for detecting diameter, a pressure sensor for detecting load and a position sensor for detecting position, using the feedback values of sensors for tracking calculation, real-time calculating the number of coil, using the tracking data and coil number update as time sequence reference to gradually control coiling, and designing a series of compensation and correction calculation schemes according to different target thicknesses of band steel, including correcting the tracking data of head of band steel, compensating the jump-off value of coil roller, calculating the number of coil, optimizing the time sequence of pressure switching control of coil roller, The setting of the pressing force of the wrapper roll is optimized, and the phenomena of indentation caused by the forward sliding of the head of the strip steel, the advanced control of the force of the wrapper roll and the impact of the strip steel on the wrapper roll are avoided;
the method specifically comprises the following steps:
s1, correcting the tracking data of the strip steel head
S1.1, tracking and correcting a pinch roll: before leaving the finishing mill and entering a coiler, the head of the strip steel passes through a hot metal detector to trigger a preparation signal; then, triggering head tracking calculation through a cold metal detector; the strip steel head passes through a pinch roll, the pinch roll triggers a loading signal through force value feedback, and tracking data is corrected in time according to the formula SPR ', wherein the SPR is an instantaneous tracking value before correction, the SPR' is an instantaneous tracking value after correction, and the Delta is SPR-H1, wherein H1 is the distance from the position right below a metal detector to the lower pinch roll;
s1.2, tracking and correcting the first circle of the wrapper roller: taking the first wrapper roll as an example, when the head of the strip steel reaches the first wrapper roll, triggering the first wrapper roll to load a signal through force value feedback, and correcting the tracking data in time according to the formula SWR 1' ═ SWR 1-Delta 1; wherein S WR1 is the instantaneous tracking value before correction, S WR 1' is the instantaneous tracking value after correction, Delta 1 is S WR 1-H2, H2 is the distance from the position right below the cold metal detector to the first wrapper roll;
s1.3, correcting the forward slip before tracking of the wrapper roller: after the mandrel expands, the change of the central diameter of the steel coil leads the actual position of the head of the strip steel to lag behind tracking data, the phenomenon of head tracking calculation forward slip is generated, and the tracking forward slip correction is needed; when the number of turns feedback value n is equal to m, wherein n is equal to 3, 4, 5 …, m is equal to mandrel expansion number of turns setting value + x, m is equal to wrapper roll opening number, x is the forward slip correction timing point parameter, and x is equal to 1, 2, 3 …, according to the formula: correcting the tracking with head once, wherein the tracking after correction L is the tracking before correction L (1-forward slip correction coefficient e);
s2. feed-forward compensation of jump-off value of auxiliary winding roller
When the number of turns is updated from n-2 to n-1 turns in feedback and the rising edge of the wrapper roller tripping signal is triggered at the same time, the current wrapper roller gap value g is stored, wherein the rising edge trigger is the instant action of turning an automatic signal from OFF to ON; when the number of turns is updated from n-1 to n turns, the compensation of the unwinding value of the wrapper roll is triggered, and finally the formula is obtained: the unwinding value of the auxiliary winding roller is given as thickness (1+ f) + g, wherein f is an unwinding value coefficient, and the unwinding value is issued after recalculation and compensation;
s3, compensating process parameters
S3.1 bit-controlled shear force control critical value point delay compensation: calculating according to the tracking data, starting from the second circle, and switching the position control mode of the wrapper roll to the pressure control mode before the head of the strip steel arrives, and pressing and applying pressure to the surface of the steel coil;
s3.2, compensation of the pressure of the wrapper roller: designing a compensation value table of the pressing force of the wrapper roll according to different thicknesses, compensating the pressing force transmitted by the upper level and then executing the compensation when the technologist finds that the pressing force transmitted by the upper level is not appropriate, and simultaneously adjusting the compensation parameter table at any time according to the requirement by the technologist;
in step S1.2, different thicknesses are matched to different trigger values.
2. The effective method for solving the indentation problem caused by hot rolling coiling is characterized in that in the step S1.2, in order to avoid the false triggering phenomenon and cause the false correction, a protection range when the correction is triggered is set, and when the tracking value | H2-S WR1| is less than or equal to a protection compensation value a, the correction at the position of the wrapper roller I is allowed to be triggered; when the tracking numerical value | H3-S WR2| is less than or equal to the protection compensation value b, the correction at the position of the second wrapper roller is allowed to be triggered; when the tracking numerical value | H4-S WR3| is less than or equal to the protection compensation value c, the correction at the position of the third wrapper roller is allowed to be triggered; h3 is the distance from the right lower part of the cold metal detector to the second wrapper roller, and H4 is the distance from the right lower part of the cold metal detector to the third wrapper roller; s WR1 is the instantaneous tracking value before correction of the first wrapper roller, S WR2 is the instantaneous tracking value before correction of the second wrapper roller, and S WR3 is the instantaneous tracking value before correction of the third wrapper roller.
3. The effective method for solving the indentation problem of hot rolled coiled coils according to claim 1, wherein in step S3.1, compensation value lists are designed for different thicknesses according to process requirements, the critical point for controlling switching is compensated, switching can be advanced or delayed, coil shapes are optimized, indentations are avoided, and meanwhile, a technician can adjust the compensation value lists according to the change of the requirements at any time.
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