CN107442585B - Control method for realizing special cooling of starting end of hot-rolled strip steel - Google Patents
Control method for realizing special cooling of starting end of hot-rolled strip steel Download PDFInfo
- Publication number
- CN107442585B CN107442585B CN201710624597.0A CN201710624597A CN107442585B CN 107442585 B CN107442585 B CN 107442585B CN 201710624597 A CN201710624597 A CN 201710624597A CN 107442585 B CN107442585 B CN 107442585B
- Authority
- CN
- China
- Prior art keywords
- cooling
- strip steel
- control
- ultra
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 122
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000004044 response Effects 0.000 claims abstract description 12
- 230000001276 controlling effect Effects 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 239000000498 cooling water Substances 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002789 length control Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a control method for realizing special cooling of the starting end of hot-rolled strip steel, which comprises the following steps: (1) open-loop control of the flow of water supplied by the variable frequency pump: (2) pressure closed-loop control of the bypass regulating valve; (3) controlling the working frequency of the variable frequency pump in a stepped frequency increasing manner; (4) and calibrating the response time of the ultra-fast cold cooling valve and tracking and controlling the position of the strip steel starting end. The control method solves the problem of pipeline flow and pressure fluctuation caused by a large amount of opening and closing of the ultra-fast cooling valve in a short time, ensures the control precision of the flow and the pressure of high-pressure water supply, realizes the special cooling control function of the starting end of the strip steel in the ultra-fast cooling high-pressure control mode, reduces the cost of equipment repair and maintenance, improves the yield of products and creates good economic benefit.
Description
Technical Field
The invention belongs to the technical field of hot-rolled strip steel rolling, and particularly relates to a control method for realizing a special cooling function of a starting end of hot-rolled ultra-fast cold high-pressure produced strip steel.
Background
Based on the high-speed continuous rolling technology and the controlled cooling technology which take ultra-fast cooling as the core, namely the new generation TMCP technology, the method can save the consumption of main alloy elements of steel and reduce the production cost of enterprises on the premise of maintaining or improving the plasticity and toughness and the service performance of the material. The ultra-fast cooling control system is used as cooling equipment for rolled strip steel, and is technically characterized in that a high-pressure injection mode is adopted, a vapor film between the strip steel and cooling water is broken, efficient jet impact heat exchange and nucleate boiling heat exchange are realized, and the cooling speed of the strip steel is further improved. Therefore, stabilization of the water supply pressure and flow in the ultra-fast cooling system is a prerequisite for achieving high-precision process temperature control.
Until now, in order to ensure the pressure and flow stability of ultra-fast cold water supply pipeline, the commonly adopted control mode is that the water supply equipment is responsible for the closed-loop control of pipeline pressure, namely, the water supply equipment consisting of a hydraulic coupler of a water supply pump station, or a combination of a variable frequency pump and a power frequency pump, or a single variable frequency pump carries out PID pressure closed-loop control by adjusting the opening degree of the hydraulic coupler or the working frequency of the variable frequency pump.
However, since the water supply equipment of the pump station is far away from the ultra-fast cooling field cooling valve, the pressure closed-loop control has a lag problem due to the water supply pressure conduction process in the pipeline, and the lag problem is superposed with the coupling effect of the pressure and the flow in the water supply pipeline, so that the long-time severe fluctuation of the pressure and the flow of the water supply pipeline after the ultra-fast cooling valve is intensively opened in a short time in the ultra-fast cooling high-pressure control mode affects the uniformity of the strip steel cooling process, and the high-precision control of the target coiling temperature in the strip steel length direction cannot be realized.
When thick specification or high-strength grade strip steel is actually produced, in order to prevent steel piling accidents in a coiling area, a special cooling function of a strip steel starting end needs to be realized, namely, the strip steel starting end is not cooled by water spraying within a set length, and a subsequent strip body needs to be cooled by water spraying to a target coiling temperature. Due to the problems in the flow and pressure control scheme in the current ultra-fast cooling high-pressure mode, the special cooling function of the high-precision strip steel starting end in the ultra-fast cooling high-pressure cooling mode cannot be realized.
Disclosure of Invention
The invention aims to provide a control method for realizing a special cooling function of a strip steel starting end in an ultrafast cooling high-pressure control mode.
In order to achieve the purpose, the invention adopts the technical scheme that:
a control method for realizing special cooling of the starting end of a hot-rolled strip steel is applied to a hot-rolled ultrafast cooling control system, different devices are adopted to independently control the ultrafast cooling water supply flow and pressure, and the working frequency of a variable frequency pump adopts stepped frequency boosting control, and specifically comprises the following steps:
(1) the variable frequency pump performs open-loop control on the water supply flow, measures the working frequency of the variable frequency pump and the water supply flow, and obtains a relation curve of the working frequency of the variable frequency pump and the water supply flow through a data fitting mode;
(2) the bypass regulating valve performs pressure PID closed-loop control;
(3) the working frequency of the variable frequency pump is changed from a reference working frequency FbaseUp-conversion to the target value FtargetA step-type frequency-increasing control mode is adopted;
(4) and calibrating the response time of the ultra-fast cooling valve, and tracking and controlling the position of the strip steel starting end.
Further, the control method for realizing the special cooling of the starting end of the hot-rolled strip steel comprises the following operation steps of open-loop control of the flow of the water supplied by the variable-frequency pump in the content (1):
s1: the opening degree of the bypass regulating valve is set to 70 percent, the pipeline pressure is regulated to be within the target range of 0.85 +/-0.02 MPa by regulating the opening and closing of the ultra-fast cooling valve and the working frequency of the variable frequency pump, and the requirement that the water supply flow of a water outlet of the variable frequency pump is 500m is met3Recording the working frequency of the variable frequency pump at the moment;
s2: repeating the step S1 to finish 1000m of the mixture respectively3/h、1500m3/h、2000m3/h、2500m3/h、3000m3/h、3500m3/h、4000m3/h、4500m3/h、5000m3The working frequency of the variable frequency pump under the condition of/h;
s3: according to the measured data in the step S2, calculating by adopting a data fitting mode to obtain a relation curve between the working frequency of the variable frequency pump and the water supply flow, namely a formula (1):
Ftarget＝f1(Flux) (1)
wherein FtargetIs the target working frequency of the variable frequency pump; automatically receiving the water supply flow of the variable frequency pump obtained by the calculation of a process computer on the basis of Flux;
s4: and writing the relation curve of the working frequency of the variable frequency pump and the water supply flow obtained according to the step S3 into a basic automatic control program.
Further, the control method for realizing the special cooling of the starting end of the hot-rolled strip steel comprises the following specific contents in the pressure closed-loop control of the bypass regulating valve in the content (2):
when the pressure of the ultra-fast cold water supply pipeline is greater than the upper limit of a control target range (0.85 plus 0.02) MPa, under the closed-loop control of pressure PID, the opening degree of a bypass adjusting valve is gradually increased to the range that the pressure of the ultra-fast cold water supply pipeline meets the target range (0.85 plus or minus 0.02 MPa); when the pressure of the ultra-fast cold water supply pipeline is smaller than the lower limit of the control target range, namely (0.85-0.02) MPa, the opening degree of the bypass adjusting valve is gradually reduced to the pressure of the ultra-fast cold water supply pipeline meeting the target range, namely within 0.85 +/-0.02 MPa, under the closed-loop control of the pressure PID.
Further, the control method for realizing the special cooling of the starting end of the hot-rolled strip steel comprises the following specific contents of the frequency conversion pump working frequency stepped frequency up control in the content (3):
the working frequency of the variable frequency pump needs to be changed from a reference working frequency FbaseRaising the frequency to a target operating frequency FtargetIn the process, 4-stage frequency rising is carried out, wherein the frequency rising is carried out once every 2s to form a stage, and the frequency rising step length delta F is calculated by a formula (2):
ΔF＝(Ftarget-Fbase)/4 (2)
5. the control method for realizing the special cooling of the starting end of the hot-rolled strip steel according to claim 1, characterized by comprising the following steps of: the calibration of the response time of the ultrafast cooling valve in the content (4) comprises the following specific contents:
ultra-fast cooling response time of each upper and lower cooling valve
And
the calibration process refers to the time difference from the time when each cooling valve is closed to the time when each cooling valve is opened to the time when the cooling water reaches the surface of the strip steel under the condition that the pressure of the ultra-fast cooling pipeline meets the target control range, namely 0.85 +/-0.02 MPa, and meanwhile, the measurement result is maintained in a background data block in the basic automatic tracking function.
Further, the control method for realizing the special cooling of the starting end of the hot-rolled strip steel comprises the following specific contents in the content (4) of tracking control of the position of the starting end of the strip steel:
the judgment of the positions of the starting end of the strip steel and the ultra-fast cooling valve in the rolling process is realized based on the position micro-tracking function of the starting end of the strip steel in a basic automatic control module, and the control process is judged according to the formulas (3) and (4):
when the ith cooling valve of the ultra-fast cooling meets the condition (3), the ith cooling valve is closed;
when the ith cooling valve of the ultra-fast cooling meets the condition (4), the ith cooling valve is opened;
wherein L issThe special cooling length is the starting end of the strip steel;accumulating the distance of the rolled strip steel from 0 moment to t moment of the last frame steel biting moment; l isiThe distance from the ultrafast cooling valve to the center of the last stand roller of the hot continuous rolling unit is the ith ultrafast cooling distance; v. oft×ΔtiThe change distance of the strip steel caused by the opening delay time of the ith ultrafast cooling valve is obtained.
The invention effectively solves the problem of pipeline flow and pressure fluctuation caused by a large amount of opening and closing of the ultra-fast cooling valve in a short time, and ensures the control precision of the flow and the pressure of high-pressure water supply, thereby realizing the special cooling control function of the strip steel starting end in the ultra-fast cooling high-pressure control mode. Meanwhile, the invention reduces the cost of equipment repair and maintenance, improves the yield of products and creates good economic benefit. The advantages of the invention specifically include:
(1) the invention separately controls the flow and the pressure of the ultrafast cooling water supply by adopting different devices, namely, the water supply device far away from the ultrafast cooling valve performs flow open-loop control, and the bypass adjusting valve close to the ultrafast cooling valve performs pressure closed-loop control. By the control strategy, the coupling influence of the pipeline flow and the pressure caused by the opening or closing of the ultra-fast cooling valve can be obviously reduced;
(2) according to the invention, through measuring the working frequency of the variable frequency pump and the specified water supply flow, a fitting mode is adopted to construct a curve of the working frequency of the variable frequency pump and the water supply flow so as to realize the open-loop control of the ultrafast cooling water supply flow;
(3) according to the invention, the opening degree of the bypass adjusting valve is adjusted, so that the pressure closed-loop control of the ultra-fast cooling pipeline is realized, and the stable speed of the pipeline pressure can be accelerated;
(4) the invention provides a stepped frequency-increasing control strategy of the ultra-fast cooling water supply variable frequency pump, which can effectively solve the problem of pressure building in a water supply pipeline caused by the unopened period of a cooling valve in an ultra-fast cooling high-pressure control mode;
(5) the invention provides a measuring method of response delay of an ultrafast cooling valve and a judging method of position tracking of a strip steel starting end and control of the ultrafast cooling valve, which can realize high-precision length control of special cooling of the strip steel starting end in an ultrafast cooling high-pressure control mode;
(6) the method and the control function of the invention can be realized by programming of a basic automation control program under the condition of not adding additional equipment or servers, and the application is convenient.
Drawings
Fig. 1 is a view showing a structure of an ultrafast cooling line flow and pressure regulator according to an embodiment of the present invention.
Fig. 2 is a control flow chart showing an embodiment of the present invention.
FIG. 3 is a graph showing the relationship between the operating frequency of the inverter pump and the flow rate of the supplied water according to the embodiment of the present invention.
FIG. 4 is a schematic view showing the tracking control of the cooling position of the starting end of the strip steel according to the embodiment of the present invention.
FIG. 5 is a diagram showing the effect of the special cooling function of the starting end of the strip steel according to the embodiment of the present invention.
1 is a variable frequency pump
2.a is an ultra-fast cooling upper cooling valve, and 2.b is an ultra-fast cooling lower cooling valve
3 is a bypass regulating valve
4 is an ultra-fast cold water supply tank
5 is the last secondary frame of the hot continuous rolling unit
6 is strip steel
Detailed description of the preferred embodiments
The technical scheme of the invention is further explained by combining the drawings and the embodiment as follows:
the special cooling mode of the starting end of the strip steel under the ultrafast cooling high-pressure control mode is applied to the production of hot-rolled thick 16mm pipeline steel, and the main equipment is shown in figure 1: the system comprises a variable frequency pump 1, an ultrafast cooling upper cooling valve 2.a, an ultrafast cooling lower cooling valve 2.b, a bypass adjusting valve 3, an ultrafast cooling water supply tank 4 and the like.
Fig. 2 specifically illustrates the implementation process of the special cooling function of the starting end of the strip steel:
step 1: constructing a relation curve of the working frequency of the variable frequency pump and the water supply flow
The relationship between the working frequency of the variable frequency pump and the water supply flow obtained according to the aforementioned operation steps of S1 and S2 of the present invention is shown in fig. 3, and the relational expression is formula (5):
Ftarget＝(3E-07)Flux2+(0.0001)Flux+(40.197) (5)
step 2: response time measurement and program modification for ultra-fast cold cooling valve
In this embodiment, the ultrafast cooling apparatus is configured with 3 groups (BANK) of cooling valves as the post-rolling cooling apparatus, each group including 10 upper and lower cooling valves. According to the above detailed description (4), the ultrafast cooling valve response time measurement is performed by using a hard-wired field operation, and the measurement results are shown in table 1:
TABLE 1 ultrafast cooling valve response time(s)
And maintaining the measurement result to an ultra-fast cooling basic automation PLC (Siemens S7-400 series) background data block for ultra-fast cooling valve delay calculation.
And step 3: stepped frequency boost control of target operating frequency of variable frequency pump
In this example, the process computer issues the variable frequency pump water supply flow Flux 3648m3H, calculating to obtain the target working frequency F of the variable frequency pump through a formula (5)targetTaking a steel biting signal of a 2 nd rolling mill of the hot continuous rolling unit as an initial frequency increasing signal of a variable frequency pump, wherein the working frequency of the variable frequency pump is equal to 44.6Hz and is equal to a reference working frequency FbaseStepped up to a target value, i.e. F, in 4 steps at 15Hztarget＝44.6Hz。
And 4, step 4: pressure closed loop control of bypass valve
In the example, when the steel biting signal of the 2 nd rolling mill of the hot continuous rolling unit is changed into ON, the pressure of the bypass valve is controlled in a closed loop mode, the target pressure of the pipeline control is 0.85 +/-0.02 MPa, and PID feedback control is adopted.
And 5: position judgment control for strip steel starting end and ultrafast cooling valve
In this example, the functions of judging and controlling the positions of the strip steel start end and the ultrafast cooling valve in the rolling process can be realized by basic automatic PLC programming, as shown in FIG. 4. Judging conditions are formulas (3) and (4), and when the ith cooling valve meets the formula (3), the valve is opened; when the ith cooling valve satisfies equation (4), the valve is closed.
The control variables involved include: the rolling speed v of the strip steel; rolling time t of the strip steel; and the response time delta t of the ultrafast cooling valve measured in the step 2i；
After the ultra-fast cooling high-pressure production strip steel starting end special cooling function is put into use, the functions that the ultra-fast cooling water spray cooling is not carried out on the strip steel starting end, and the strip body is cooled to the target coiling temperature are realized, and fig. 5 shows a control curve of the ultra-fast cooling pipeline pressure and the strip steel coiling temperature when the rolled pipeline steel X65, the thickness specification of 16.5mm, the target coiling temperature of 520 ℃ and the target starting end special cooling length of 3m are implemented according to the invention: the high-temperature length of the starting end meets the target requirement, and the pressure of the pipeline is stably controlled.
Although embodiments of the invention have been disclosed above, further modifications may readily occur to those skilled in the art, and the invention is therefore not limited to the specific details, without departing from the general concept defined by the claims and their equivalents.
Claims (5)
1. A control method for realizing special cooling of the starting end of hot-rolled strip steel is characterized by comprising the following steps: the method is applied to a hot rolling ultrafast cooling control system, different devices are adopted to independently control the ultrafast cooling water supply flow and pressure, and the working frequency of a variable frequency pump is controlled in a stepped frequency increasing mode, and the method specifically comprises the following steps:
(1) the variable frequency pump performs open-loop control on the water supply flow, measures the working frequency of the variable frequency pump and the water supply flow, and obtains a relation curve of the working frequency of the variable frequency pump and the water supply flow through a data fitting mode; the open-loop control operation steps of the flow of the water supplied by the variable frequency pump comprise:
s1: the opening degree of the bypass regulating valve is set to 70 percent, the pipeline pressure is regulated to be within the target range of 0.85 +/-0.02 MPa by regulating the opening and closing of the ultra-fast cooling valve and the working frequency of the variable frequency pump, and the requirement that the water supply flow of a water outlet of the variable frequency pump is 500m is met3Recording the working frequency of the variable frequency pump at the moment;
s2: repeating the step S1 to finish 1000m of the mixture respectively3/h、1500m3/h、2000m3/h、2500m3/h、3000m3/h、3500m3/h、4000m3/h、4500m3/h、5000m3The working frequency of the variable frequency pump under the condition of/h;
s3: according to the measured data in the step S2, calculating by adopting a data fitting mode to obtain a relation curve between the working frequency of the variable frequency pump and the water supply flow, namely a formula (1):
Ftarget＝f1(Flux) (1)
wherein FtargetIs the target working frequency of the variable frequency pump; automatically receiving the water supply flow of the variable frequency pump obtained by the calculation of a process computer on the basis of Flux;
s4: writing the relation curve between the working frequency of the variable frequency pump and the water supply flow obtained in the step S3 into a basic automatic control program;
(2) the bypass regulating valve performs pressure PID closed-loop control;
(3) the working frequency of the variable frequency pump is changed from a reference working frequency FbaseUp-conversion to the target value FtargetA step-type frequency-increasing control mode is adopted;
(4) and calibrating the response time of the ultra-fast cooling valve, and tracking and controlling the position of the strip steel starting end.
2. The control method for realizing the special cooling of the starting end of the hot-rolled strip steel according to claim 1, characterized by comprising the following steps of: the pressure closed-loop control of the bypass regulating valve in the content (2) comprises the following specific contents:
when the pressure of the ultra-fast cold water supply pipeline is greater than the upper limit of a control target range (0.85 plus 0.02) MPa, under the closed-loop control of pressure PID, the opening degree of a bypass adjusting valve is gradually increased to the range that the pressure of the ultra-fast cold water supply pipeline meets the target range (0.85 plus or minus 0.02 MPa); when the pressure of the ultra-fast cold water supply pipeline is smaller than the lower limit of the control target range, namely (0.85-0.02) MPa, the opening degree of the bypass adjusting valve is gradually reduced to the pressure of the ultra-fast cold water supply pipeline meeting the target range, namely within 0.85 +/-0.02 MPa, under the closed-loop control of the pressure PID.
3. The control method for realizing the special cooling of the starting end of the hot-rolled strip steel according to claim 1, characterized in that: the variable frequency pump working frequency stepped frequency increasing control in the content (3) comprises the following specific contents:
the working frequency of the variable frequency pump needs to be changed from a reference working frequency FbaseRaising the frequency to a target operating frequency FtargetIn the process, 4-stage frequency rising is carried out, wherein the frequency rising is carried out once every 2s to form a stage, and the frequency rising step length delta F is calculated by a formula (2):
ΔF＝(Ftarget-Fbase)/4 (2)。
4. the control method for realizing the special cooling of the starting end of the hot-rolled strip steel according to claim 1, characterized by comprising the following steps of: the calibration of the response time of the ultrafast cooling valve in the content (4) comprises the following specific contents:
ultra-fast cooling response time of each upper and lower cooling valve
And
the calibration process refers to that under the condition that the pressure of the ultra-fast cooling pipeline meets the target control range, namely 0.85 +/-0.02 MPa, each cooling valve is adjusted from being closed to being openedAnd maintaining the measurement result to a background data block in the basic automatic tracking function at the same time of the time difference from the moment when the cooling water reaches the surface of the strip steel.
5. The control method for realizing the special cooling of the starting end of the hot-rolled strip steel according to claim 1, characterized by comprising the following steps of: the tracking control of the position of the starting end of the strip steel in the content (4) comprises the following specific contents:
the judgment of the positions of the starting end of the strip steel and the ultra-fast cooling valve in the rolling process is realized based on the position micro-tracking function of the starting end of the strip steel in a basic automatic control module, and the control process is judged according to the formulas (3) and (4):
when the ith cooling valve of the ultra-fast cooling meets the condition (3), the ith cooling valve is closed;
when the ith cooling valve of the ultra-fast cooling meets the condition (4), the ith cooling valve is opened;
wherein L issThe special cooling length is the starting end of the strip steel;
accumulating the distance of the rolled strip steel from 0 moment to t moment of the last frame steel biting moment; l isiThe distance from the ultrafast cooling valve to the center of the last stand roller of the hot continuous rolling unit is the ith ultrafast cooling distance; v. oft×ΔtiThe change distance of the strip steel caused by the opening delay time of the ith ultrafast cooling valve is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624597.0A CN107442585B (en) | 2017-07-27 | 2017-07-27 | Control method for realizing special cooling of starting end of hot-rolled strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624597.0A CN107442585B (en) | 2017-07-27 | 2017-07-27 | Control method for realizing special cooling of starting end of hot-rolled strip steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107442585A CN107442585A (en) | 2017-12-08 |
| CN107442585B true CN107442585B (en) | 2020-02-21 |
Family
ID=60489637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710624597.0A Active CN107442585B (en) | 2017-07-27 | 2017-07-27 | Control method for realizing special cooling of starting end of hot-rolled strip steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107442585B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109174974B (en) * | 2018-08-31 | 2019-08-20 | 东北大学 | A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line |
| CN109604355A (en) * | 2018-11-30 | 2019-04-12 | 张家港宏昌钢板有限公司 | The constant pressure water supply control method of hot-strip ultra-rapid cooling pumping plant |
| CN110805096A (en) * | 2019-11-22 | 2020-02-18 | 东北大学 | Variable-frequency water supply control method for heat treatment of metal plate strip |
| CN111069308A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | Method for improving on-line accelerated cooling uniformity of medium plate |
| CN112474814A (en) * | 2020-10-29 | 2021-03-12 | 鞍钢集团自动化有限公司 | Energy-saving control method for ultra-fast cold pressure |
| CN114369707B (en) * | 2021-12-03 | 2024-02-06 | 首钢集团有限公司 | Strip steel without flat coil defect and chromatic aberration defect, and preparation method and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680320A (en) * | 1979-12-03 | 1981-07-01 | Nisshin Steel Co Ltd | Back tension applying method |
| CN102814339A (en) * | 2012-08-30 | 2012-12-12 | 镇江市宏业科技有限公司 | Rolling oil controlling system |
| CN105414203B (en) * | 2015-12-10 | 2017-11-03 | 安徽马钢自动化信息技术有限公司 | A kind of method for improving polishing machine HGC hydraulic cylinder roll-force control accuracies |
| CN106238468A (en) * | 2016-10-14 | 2016-12-21 | 东北大学 | A kind of territory, hot-strip ultrafast cold-zone head not cooling control method |
-
2017
- 2017-07-27 CN CN201710624597.0A patent/CN107442585B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107442585A (en) | 2017-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107442585B (en) | Control method for realizing special cooling of starting end of hot-rolled strip steel | |
| CN103611734B (en) | A kind of section cooling temperature-controlled process and system | |
| CN104525885B (en) | A kind of strong cold water spray system of cast steel and strong refrigerating technology | |
| CN101983800B (en) | Secondary cooling water distribution advanced control method for billet continuous casting machine | |
| CN103861879A (en) | Online cooling device and control method for moderate-thickness plate | |
| CN107971345B (en) | Process control system and control method for steel pipe on-line cooling | |
| CN110624960B (en) | Strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling | |
| CN103605390B (en) | A kind of water-supply control of hot-rolling line ultra-rapid cooling system | |
| CN105327949B (en) | A kind of flow control methods of hot steel strip coiling temperature | |
| CN201922012U (en) | Advanced secondary cooling water distribution control device for billet caster | |
| CN103071774A (en) | Method for controlling surface temperature of casting blank at straightening point of continuous casting machine | |
| CN102059333A (en) | Advanced secondary cooling water control system of billet continuous casting machine | |
| CN101406902A (en) | Control method of hot-rolled steel sheet water-cooling plate | |
| CN102389902A (en) | Sectional cooling control method for emulsion of working roller of single-frame rolling mill | |
| CN102260774A (en) | Water cooling system controlled by multiple parameters | |
| CN104841701B (en) | Method for controlling sheet coiling temperature during large-deceleration rolling of hot-rolled strip steel | |
| CN104148404A (en) | Hot rolled strip flatness automatic control method | |
| CN111069308A (en) | Method for improving on-line accelerated cooling uniformity of medium plate | |
| US20230203612A1 (en) | Method for the open-loop or closed-loop control of the temperature of a steel strip during hot working in a hot strip mill | |
| CN104942025A (en) | Heredity coefficient compensation method used for hot-rolling coiling temperature model after rolling stops | |
| CN109604355A (en) | The constant pressure water supply control method of hot-strip ultra-rapid cooling pumping plant | |
| CN117532108A (en) | Device and method for improving forming quality and two-phase proportion of arc additive manufacturing duplex stainless steel through online solid solution | |
| Li et al. | Research and Application of Ultra‐Fast Cooling System and Velocity Controlled Strategy for Hot Rolled Strip | |
| CN206643135U (en) | DEVICE FOR BAR AND WIRE HOT ROLLING water cooling plant control system | |
| CN109174974B (en) | A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |