CN112404141A - Effective method for solving indentation problem in hot rolling coiling - Google Patents
Effective method for solving indentation problem in hot rolling coiling Download PDFInfo
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- CN112404141A CN112404141A CN202011127911.2A CN202011127911A CN112404141A CN 112404141 A CN112404141 A CN 112404141A CN 202011127911 A CN202011127911 A CN 202011127911A CN 112404141 A CN112404141 A CN 112404141A
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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
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Abstract
The invention discloses an effective method for solving the problem of indentation in hot rolling coiling, and relates to a method specially suitable for the control technology of a metallurgical hot rolled 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 coiling.
Background
The 2250mm hot rolling leading product of a metal manufacturing company is a high-quality rare earth hot rolling 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 moment according to a coiling moment 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 moment 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 wrapper roll of the coiling machine", which makes the wrapper roll keep a light set pressure and controls the roll gap of the wrapper roll to be opened dynamically and synchronously with the increase of the coiling layers and the expansion of the coiling block 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 the thickness is always kept at a light degree. The method has the disadvantages that the setting of the jump-off 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 the 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 effectively eliminating the indentation of hot rolling coiling.
In order to solve the technical problems, 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 head-to-data of the strip steel, compensating the trip value of the wrapper roll, calculating the number of the strip steel, optimizing the time sequence, 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, 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 angle 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, SWR1 is the instantaneous tracking value before correction, SWR 1' is the instantaneous tracking value after correction, Delta 1 is SWR 1-H2, and 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 of the primary tape head, wherein the tracking after correction is equal to the tracking before correction L (1-forward slip correction coefficient e);
s2, feedforward compensation of unwinding 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, 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 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;
3.2 compensation of the pressing force of the wrapper roller: the wrapper roll pressing force compensation value table is designed according to different thicknesses, when the craft personnel find that the pressing force issued by the upper level is not appropriate, the pressing force issued by the upper level can be compensated and then executed, and meanwhile, the craft personnel can adjust the compensation parameter table at any time according to requirements.
Further, in step S1.2, different thicknesses are matched to different trigger values.
Furthermore, in the step S1.2, in order to avoid the false triggering phenomenon and cause the false correction, the triggering correction is within 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 1 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 problem of indentation in hot-rolled coiling, can obviously eliminate the indentation defect of the inner ring of the strip steel of 3-22mm, can prevent the false correction caused by the false triggering of the loading signal of the wrapper roll due to the unstable equipment state and other reasons by setting the protection range, and can avoid 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 indentation problem of hot rolled coil;
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 of 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 mandrel expansion before and after.
Detailed Description
As shown in FIGS. 1 to 5, an effective method for solving the indentation problem of 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 the 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 angle is SPR-2640 mm, and the distance from the position right below the cold metal detector to the lower pinch roll is 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 (different thicknesses are matched with different trigger values) through force value feedback, and the tracking data is corrected in time according to the formula SWR1 ═ SWR1 — - Δ 1. Wherein S WR1 is the instantaneous tracking value before correction, SWR 1' is the instantaneous tracking value after correction, Δ 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. But in order to avoid the phenomenon of false triggering and cause false correction, the triggering correction is protected, and when the tracking value |6313mm-S WR1| ≦ 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 winding 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 head tracking calculation forward slip phenomenon occurs, and the tracking forward slip correction is required. 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 post-correction track L ═ the pre-correction track L (— 1 — pre-slip correction coefficient e), and the primary tape head tracking is corrected.
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 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, 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 (3) giving the roll opening value as thickness (1+ f) + g, recalculating compensation and then executing.
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 pressing force of the wrapper roller: the wrapper roll pressing force compensation value table is designed according to different thicknesses, when the craft personnel find that the pressing force issued by the upper level is not appropriate, the pressing force issued by the upper level can be compensated and then executed, and meanwhile, the craft personnel can adjust the compensation parameter table at any time according to requirements.
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 2019 and 12 months, the specific parameter settings are shown in tables 1-3, and hot rolled steel strips with the thickness of 3-22mm 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 impression or contusion is caused visually, and no concave-convex feeling is caused by hand touch, which is 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 (5)
1. An effective method for solving the indentation problem of coiling by hot rolling includes such steps as providing a control system for the hot rolling coiler, including a mandrel unit with a position sensor for detecting diameter, a pressure sensor for detecting load and a position sensor for detecting position, tracking the feedback values of the sensors, real-time calculating the number of turns, updating the tracking data and the number of turns, and using the feedback signals of pinch and wrapper rollers to design a series of compensation and correction schemes according to different target thicknesses of band steel 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.
2. The effective method for solving the indentation problem of hot rolling coiling according to claim 1 is characterized by comprising the following steps:
s1 correction of tracking data of 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 angle 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, 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 of the primary tape head, wherein the tracking after correction is equal to the tracking before correction L (1-forward slip correction coefficient e);
s2, feedforward compensation of unwinding 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, 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 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;
3.2 compensation of the pressing force of the wrapper roller: the wrapper roll pressing force compensation value table is designed according to different thicknesses, when the craft personnel find that the pressing force issued by the upper level is not appropriate, the pressing force issued by the upper level can be compensated and then executed, and meanwhile, the craft personnel can adjust the compensation parameter table at any time according to requirements.
3. An effective method for solving the indentation problem of hot rolled coil winding according to claim 2, wherein in step S1.2, different thicknesses are matched with different trigger values.
4. The effective method for solving the indentation problem of hot rolling coiling as claimed in claim 2, wherein in the step S1.2, in order to avoid the false triggering phenomenon and cause the false correction, a protection range for triggering correction is set, and when the tracking value | H2-S WR1| ≦ protection compensation value a, the correction at the wrapper roller position of the first 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.
5. The effective method for solving the indentation problem of hot rolling coiling according to claim 2, characterized in that 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 shape is optimized, indentation is 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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