CN104801550B - Method for controlling finish rolling steel throwing speed of hot continuous rolling mill - Google Patents
Method for controlling finish rolling steel throwing speed of hot continuous rolling mill Download PDFInfo
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- CN104801550B CN104801550B CN201410033194.5A CN201410033194A CN104801550B CN 104801550 B CN104801550 B CN 104801550B CN 201410033194 A CN201410033194 A CN 201410033194A CN 104801550 B CN104801550 B CN 104801550B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 238000005096 rolling process Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000004886 process control Methods 0.000 claims abstract description 12
- 238000005498 polishing Methods 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000002436 steel type Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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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
- B21B37/46—Roll speed or drive motor control
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Abstract
A method for controlling the finish rolling steel throwing speed of a hot continuous rolling mill adopts a rack speed detector, a clamping-delivering roller speed detector, a conveying roller way speed detector, a basic automatic level control machine and a process control machine to conduct speed reduction correction and segmented speed reduction control on the speed of a conveying roller way in a laminar cooling region between a finish rolling process and a coiling process according to set process requirement, specifically a secondary tracking and positioning mode is adopted for the speed reduction point control, a secondary correction mode is adopted for tail portion speed reduction control process to achieve indirect control of tensions of strip steel and the conveying roller way.
Description
Technical Field
The invention belongs to the field of hot rolling process control, and particularly relates to a control method for the finish rolling steel throwing speed of a hot continuous rolling mill.
Background
For the hot continuous rolling unit, the speed control of finish rolling and steel throwing directly influences the control of coiling temperature, strip steel coiling quality and strip steel tail quality, therefore, in the prior control technology, the running speed of the tail part of the strip steel is controlled, generally, in the process of casting the thin strip steel, the speed reduction control is adopted, that is, the tail speed of the strip steel is controlled in a progressive way by adopting a certain deceleration, the basic control is that the deceleration is set in L2, the running speed of the strip steel is decelerated by a certain deceleration, but in the actual production process of the site, because of the deceleration, when the running strip steel, especially when rolling thin strip steel (1.5 mm-2.5) mm, because the steel throwing speed is high, the tail of the strip steel is easy to lift and move unstably, coiling edge loss is easy to generate, and the tail quality and the coiling stability of the strip steel are directly influenced.
The patent with the application number of CN02144825.6 and the name of 'laminar flow cooling method for intermediate blank of hot rolled strip' is characterized in that 2-5 sets of laminar flow cooling devices are arranged at the outlet of a roughing mill to form a laminar flow cooling area with the length of L, and the cooling water flow Q for cooling the intermediate blank to the required temperature is calculated according to the steel type and the specification of the intermediate blank by calculating the time t1 that each point of the intermediate blank passes through the laminar flow cooling area and the total time t2 that one intermediate blank passes through the laminar flow cooling area;
the patent with the application number of CN200410021048.7 and the name of 'a strip steel laminar flow cooling device and a cooling control method thereof' mainly relates to a technology of dividing a laminar flow cooling area into two cooling areas and simultaneously having a strong cooling function, and the patent technology comprises the strip steel laminar flow cooling device and the cooling control method thereof. The device mainly comprises an upper laminar flow collecting pipe and a lower jet collecting pipe, a cooling area comprises a main cooling section and a fine cooling section, and the main cooling section and the fine cooling section are respectively composed of a plurality of upper laminar flow collecting pipe groups and a corresponding number of lower jet collecting pipe groups. The cooling control method is realized by a computer through setting calculation, feedback calculation and feedforward calculation. So as to meet the requirements of coiling temperature control and cooling speed control.
The patent with the application number of CN02132975.3 and the name of 'three-section laminar cooling process for hot-rolled strip steel', provides a three-section laminar cooling process for hot-rolled strip steel, which technically adopts a computer to control the laminar cooling, and is characterized in that the strip steel is set into three sections for cooling, the first section is a head section with the length of 30m, the second section is a middle section of the strip steel, the third section is a tail section with the length of 20m, and the cooling temperatures of the three sections are respectively controlled as follows: the middle section is equal to the target coiling temperature, the head section is 20-50 ℃ higher than the target coiling temperature, and the tail section is 20-40 ℃ higher than the target coiling temperature. The three-section laminar cooling process for the hot-rolled strip steel can improve the performance uniformity of the strip steel, solves the problems that the hot-rolled strip steel is easy to clamp steel in thin specifications and easy to spread steel in thick specifications due to low head temperature, and better meets the requirements of the next procedure due to the improvement of the performance uniformity of the strip steel.
The three patent technologies have a certain degree of relevance with the technical scheme of the application, mainly relate to temperature control related to the strip steel in the laminar cooling control process, but do not relate to and solve the problem of the strip steel in the deceleration control process in the technical scheme.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the finish rolling and steel throwing speed of a hot continuous rolling mill, which has the following specific technical scheme:
a control method for the finish rolling and steel throwing speed of a hot continuous rolling mill is characterized by comprising the following steps of controlling the speed of a conveying roller way in a laminar cooling area between the finish rolling and coiling procedures according to the requirements set by the process by matching a rack speed detector, a pinch roller speed detector, a conveying roller way speed detector with a basic automatic level control machine and a process control machine, and realizing the indirect control of the tension of strip steel and the conveying roller way, wherein the control method comprises the following steps:
s1: the machine frame speed detector reads a current machine frame speed value in real time and feeds the current machine frame speed value back to the basic automation level control machine, the pinch roll speed detector reads a current pinch roll speed value in real time and feeds the current pinch roll speed value back to the basic automation level control machine, the basic automation level control machine establishes and sends a strip steel tail position reference point to the basic automation level control machine according to the read current machine frame speed value and the current pinch roll speed value and combining with the requirements set according to the process, and real-time monitoring of the position of the strip steel tail part away from the front position of a finished product machine frame is realized according to the functional relation between speed time displacement;
s2: when the tail of the strip steel is detected to reach the conveying roller way, the basic automation level control machine reads the conveying roller way speed value from the conveying roller way speed detector and transmits the conveying roller way speed value to the process control machine, the process control machine calculates the compensation value of the acceleration and deceleration of the strip steel according to the thickness and the steel grade of the strip steel, the corrected conveying roller way speed value is calculated by combining the current conveying roller way speed value, and the corrected conveying roller way speed value is issued to the basic automation level control machine to finish the first correction of the conveying roller way speed;
s3: grouping the rollgang, when the rollgang speed detector of each group detects that the band steel reaches the rollgang of the current group, sending a signal to the basic automation level control machine, informing the process control machine by the basic automation level control machine to calculate the second speed correction calculation of the rollgang of the current group, and sending the second speed correction calculation to the basic automation level control machine to finish the second correction of the speed of the rollgang of the current group.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: in step S1, the strip tail position reference point established according to the process setting requirement and sent to the basic automation level control machine is established according to the signal jump value of the strip rolling force.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: in step S1, the real-time monitoring of the position of the tail of the strip steel before leaving the finished rack is realized according to the functional relationship between the speed and the time displacement, where the functional relationship between the speed and the time displacement is: l isTE＝VRoll×Tscant+LTE_OLDWherein
LTE: tracking the position of the tail of the strip steel by unit m;
LTE_OLD: tracking the position of the tail of the strip steel in the previous scanning period by unit m;
VRoll: the speed of the pinch roll, in m/s;
Tscant: scanning period of PLC, unit s.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: in step S2, the process controller calculates a compensation value for acceleration and deceleration of the strip steel according to the thickness and steel type of the strip steel, and calculates a corrected speed value of the rollgang in combination with the current speed value of the rollgang, specifically:
wherein,
VStrip: the corrected strip steel speed is in the unit of m/s;
α f (g, h) compensation value of strip steel acceleration and deceleration in m/s2；
S: the unit of the deceleration distance sent by the process control machine is m;
h: actual thickness of the finished strip steel product;
g: and classifying steel grades.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: in step S3, the grouping of the rollgang is performed according to the capacity of the inverter.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: in step S3, the process controller calculates the second speed correction of the current set of rollgang specifically as follows:
VRoll′＝Vstrip× (1- β), wherein,
VRoll': the speed of the current group of conveying roller ways is in m/s;
Vstrip: the corrected strip steel speed is in the unit of m/s;
beta: correction of the speed of the conveying roller way.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: and the h value is detected by a thickness gauge and fed back to the basic automatic level control machine.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized by comprising the following steps of: the value range of the beta is 5 to 20 percent.
The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill is characterized in that the signal jump value of the strip steel rolling force is a value after secondary correction.
The control method of the finish rolling and steel throwing speed of the hot continuous rolling mill adopts the control of speed reduction correction and sectional speed reduction, adopts secondary tracking positioning on the control of a speed reduction point, combines the sectional speed control of a roller way, realizes the control of the tail speed, and simultaneously adopts a secondary correction mode in the speed reduction control process of the tail part, and realizes the optimal control of the strip steel speed and the roller way speed.
Drawings
FIG. 1 is a schematic control flow diagram of the present invention.
Detailed Description
The method for controlling the finish rolling and steel throwing speed of the hot continuous rolling mill according to the present invention will be described in further detail with reference to the drawings and the embodiments of the present specification.
The control method for the finish rolling and steel throwing speed of the hot continuous rolling mill comprises the following specific control technical scheme:
1. judging the position of the strip steel after being thrown
The tail position tracking of the strip steel is combined, the rolling force change of a rack is used as a condition in the technical scheme to judge the specific position of the tail of the strip steel, and the specific scheme is as follows:
1.1, judging the specific position of the tail of the strip steel by taking a rolling force signal of a rack as a judgment condition, and taking the specific position as a reference point of the tail of the strip steel;
1.2, after the reference point of the tail part of the strip steel is known, a system scanning period is adopted as a time control point, and the current speed of a product rack is combined to judge the actual position of the tail part of the strip steel;
1.3, in order to further correct the actual position of the tail part of the strip steel, in the technical scheme, the steel throwing rolling force of a finished rack is adopted as secondary position correction to control the current actual position of the tail part of the strip steel;
2. speed of pinch roll is collected
And a speed feedback sensor is arranged at the lower pinch roll, and the position of the strip steel is tracked through the speed fed back by the sensor.
3. Tracking the position of the strip steel leaving the finished product rack by taking the speed of the pinch roll as a basis, wherein the specific method comprises the following steps:
LTE＝VRoll×Tscant+LTE_OLD
in the above formula, the first and second carbon atoms are,
LTE: tracking the position of the tail of the strip steel by unit m;
LTE_OLD: tracking the position of the tail of the strip steel in the previous scanning period by unit m;
VRoll: the speed of the pinch roll, in m/s;
Tscant: scanning period of PLC, unit s.
4. Controlling the speed of the output roller way of the finished product rack: the speed of the rollgang outlet of the frame is controlled by combining the tail part of the strip steel leaving the finished product frame, and the speed is as follows:
wherein,
VStrip: the corrected strip steel speed is in the unit of m/s;
α f (g, h) compensation value of strip steel acceleration and deceleration in m/s2；
S: the deceleration distance (usually 1m) issued by the process controller is in m;
h: the actual thickness of the finished product of the strip steel is a fixed value for a certain strip steel;
g: classifying steel types, wherein a certain strip steel is a fixed value;
the compensation value alpha related to the acceleration and deceleration of the strip steel is specifically controlled as follows:
a two-dimensional table of compensation values alpha of deceleration is established for strip steels of different steel types and thicknesses through an L2 process computer:
| h/g | <2.0 | 2.0-2.199 | 2.2-2.499 | 2.5-2.799 | 2.8-3.099 | 3.1-3.399 | 3.4-3.899 | 3.9-4.299 |
| 1 | α1 | α101 | α201 | α301 | α401 | α501 | α601 | α701 |
| 2 | α2 | α102 | α202 | α302 | α402 | α502 | α602 | α702 |
| 3 | α3 | α103 | α203 | α303 | α403 | α503 | α603 | α703 |
| 4 | α4 | α104 | α204 | α304 | α404 | α504 | α604 | α704 |
| 5 | α5 | α105 | α205 | α305 | α405 | α505 | α605 | α705 |
| 6 | α6 | α106 | α206 | α306 | α406 | α506 | α606 | α706 |
| 7 | α7 | α107 | α207 | α307 | α407 | α507 | α607 | α707 |
| 8 | α8 | α108 | α208 | α308 | α408 | α508 | α608 | α708 |
| 9 | α9 | α109 | α209 | α309 | α409 | α509 | α609 | α709 |
| 10 | α10 | α110 | α210 | α310 | α410 | α510 | α610 | α710 |
| 11 | α11 | α111 | α211 | α311 | α411 | α511 | α611 | α711 |
| 12 | α12 | α112 | α212 | α312 | α412 | α512 | α612 | α712 |
5, the computer in the L2 process is combined with the compensation value alpha of the target deceleration and issues the basis automation according to different strip steel thicknesses and steel grades;
6. controlling the speed of the roller way at the current section: combining a compensation value alpha issued by an L2 process control computer, controlling the current roller way speed by the distance (position) from the tail of the strip steel to the finished product rack, namely controlling the speed of a first group of roller ways from the finished product rack, and the specific method comprises the following steps:
6.1, controlling the grouping speed of the roller ways behind the finished product rack
The principle of roller way grouping is as follows: the capacity of the inverter is mainly considered according to the condition of the unit, and the number of the motors in each group is determined according to the capacity of the inverter. For example, three hot rolling passes are run on 30 rolls in group 1, 30 rolls in group 2, … …, and 25 rolls in group 11.
6.2, when the tail part of the strip steel enters the roller way of the group, controlling the speed of the roller way, and specifically comprising the following steps:
VRoll′＝Vstrip×(1-β)
in the above formula, the first and second carbon atoms are,
VRoll': the speed of the current group of conveying roller ways is in m/s;
Vstrip: the corrected strip steel speed is in the unit of m/s;
beta: correction of the speed of the conveying roller way. The value range is 5% -20%.
For example, when the tail of the strip steel is positioned at the first group of roller ways behind the finished stand, and when the compensation value α of the received deceleration is α 202, the actual running speed of the strip steel behind the finished stand is the speed of the pinch rollThe running speed of the roller way of the current group is the corrected strip steel speed Vstrip×(1-β)。
The control method of the finish rolling and steel throwing speed of the hot continuous rolling mill adopts the control of speed reduction correction and sectional speed reduction, adopts secondary tracking positioning on the control of a speed reduction point, combines the sectional speed control of a roller way, realizes the control of the tail speed, and simultaneously adopts a secondary correction mode in the speed reduction control process of the tail part, and realizes the optimal control of the strip steel speed and the roller way speed. The control of the quality of the tail part of the strip steel and the temperature of the tail part are effectively improved by controlling the speed in the process of finish rolling and steel throwing.
Claims (9)
1. A control method for the finish rolling and steel throwing speed of a hot continuous rolling mill is characterized by comprising the following steps of controlling the speed of a conveying roller way in a laminar cooling area between the finish rolling and coiling procedures according to the requirements set by the process by matching a rack speed detector, a pinch roller speed detector, a conveying roller way speed detector with a basic automatic level control machine and a process control machine, and indirectly controlling the tension of strip steel and the tension of the conveying roller way, wherein the control method comprises the following steps:
s1: the machine frame speed detector reads a current machine frame speed value in real time and feeds the current machine frame speed value back to the basic automation level control machine, the pinch roll speed detector reads a current pinch roll speed value in real time and feeds the current pinch roll speed value back to the basic automation level control machine, the basic automation level control machine establishes and sends a strip steel tail position reference point to the basic automation level control machine according to the read current machine frame speed value and the current pinch roll speed value and combining with the requirements set according to the process, and real-time monitoring of the position of the strip steel tail part away from the front position of a finished product machine frame is realized according to the functional relation between speed time displacement;
s2: when the tail of the strip steel is detected to reach the conveying roller way, the basic automation level control machine reads the conveying roller way speed value from the conveying roller way speed detector and transmits the conveying roller way speed value to the process control machine, the process control machine calculates the compensation value of the acceleration and deceleration of the strip steel according to the thickness and the steel grade of the strip steel, the corrected conveying roller way speed value is calculated by combining the current conveying roller way speed value, and the corrected conveying roller way speed value is issued to the basic automation level control machine to finish the first correction of the conveying roller way speed;
s3: grouping the rollgang, when the rollgang speed detector of each group detects that the band steel reaches the rollgang of the current group, sending a signal to the basic automation level control machine, informing the process control machine by the basic automation level control machine to calculate the second speed correction calculation of the rollgang of the current group, and sending the second speed correction calculation to the basic automation level control machine to finish the second correction of the speed of the rollgang of the current group.
2. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 1, characterized by comprising the following steps of: in step S1, the strip tail position reference point established according to the process setting requirement and sent to the basic automation level control machine is established according to the signal jump value of the strip rolling force.
3. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 1, characterized by comprising the following steps of: in step S1, the speed-time displacement is monitored in real time according to the functional relationship between the speed-time displacement when the tail of the strip steel leaves the front position of the finished rackThe functional relationship between the two is as follows: l isTE＝VRoll×Tscant+LTE_OLD，
Wherein,
LTE: tracking the position of the tail of the strip steel by unit m;
LTE_OLD: tracking the position of the tail of the strip steel in the previous scanning period by unit m;
VRoll: the speed of the pinch roll, in m/s;
Tscant: scanning period of PLC, unit s.
4. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 1, characterized by comprising the following steps of: in step S2, the process controller calculates a compensation value for acceleration and deceleration of the strip steel according to the thickness and steel type of the strip steel, and calculates a corrected speed value of the rollgang in combination with the current speed value of the rollgang, specifically:
wherein,
VStrip: the corrected strip steel speed is in the unit of m/s;
α f (g, h) compensation value of strip steel acceleration and deceleration in m/s2；
S: the unit of the deceleration distance sent by the process control machine is m;
h: actual thickness of the finished strip steel product;
g: and classifying steel grades.
5. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 1, characterized by comprising the following steps of: in step S3, the grouping of the rollgang is performed according to the capacity of the inverter.
6. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 1, characterized by comprising the following steps of: in step S3, the process controller calculates the second speed correction of the current set of rollgang specifically as follows:
VRoll′＝Vstrip× (1- β), wherein,
VRoll': the speed of the current group of conveying roller ways is in m/s;
Vstrip: the corrected strip steel speed is in the unit of m/s;
beta: correction of the speed of the conveying roller way.
7. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 4, characterized in that: and the h value is detected by a thickness gauge and fed back to the basic automatic level control machine.
8. The method for controlling the finish rolling steel throwing speed of the hot continuous rolling mill according to claim 6, characterized in that: the value range of the beta is 5 to 20 percent.
9. The method for controlling the finish rolling and steel polishing speed of the hot continuous rolling mill according to claim 2, wherein the signal jump value of the rolling force of the strip steel is a value after secondary correction.
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| CN109570242B (en) * | 2017-09-29 | 2020-06-23 | 宝山钢铁股份有限公司 | Control method for hot rolling cooling roller way |
| CN112570466B (en) * | 2019-09-30 | 2023-01-20 | 宝山钢铁股份有限公司 | Control method for solving scratch of high-surface thin-specification strip steel conveying roller way |
| CN113996654B (en) * | 2020-07-28 | 2024-03-08 | 宝山钢铁股份有限公司 | Operation control method of roughing mill |
| CN114247760B (en) * | 2020-09-23 | 2024-02-13 | 宝山钢铁股份有限公司 | Comprehensive diagnosis method for cold rolling broken belt of brittle material |
| CN112732700B (en) * | 2021-01-25 | 2023-03-14 | 中冶赛迪信息技术(重庆)有限公司 | Steel rolling production data slicing method, system, medium and electronic terminal |
| CN113042544B (en) * | 2021-02-23 | 2023-05-12 | 首钢京唐钢铁联合有限责任公司 | Method and device for acquiring strip steel tail-throwing deceleration starting point |
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