CN107442585A - A kind of control method for realizing the special cooling of hot-strip initiating terminal - Google Patents
A kind of control method for realizing the special cooling of hot-strip initiating terminal Download PDFInfo
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- CN107442585A CN107442585A CN201710624597.0A CN201710624597A CN107442585A CN 107442585 A CN107442585 A CN 107442585A CN 201710624597 A CN201710624597 A CN 201710624597A CN 107442585 A CN107442585 A CN 107442585A
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- frequency
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- initiating terminal
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The present invention provides a kind of control method for realizing the special cooling of hot-strip initiating terminal, including content：(1) the flow opened loop control of frequency conversion water supplying pump：(2) the pressure closed loop control of bypass regulator valve door；(3) variable frequency pump working frequency staged raising frequency controls；(4) ultrafast cold but valve response time calibrating and strip initiating terminal Position Tracking Control.Using control method of the present invention, solve the problems, such as a large amount of piping flows caused by switching station and pressure oscillation in the ultrafast cold coolant valve short time, it ensure that the flow of high service and the control accuracy of pressure, realize the special cooling control function of strip initiating terminal under ultrafast cold anticyclone control model, reduce the expense of equipment repair and maintenance, improve the lumber recovery of product, create good economic benefit.
Description
Technical field
The invention belongs to Hot Rolling Strip technical field, more particularly to one kind realizes the ultrafast cold anticyclone production strip of hot rolling
The control method of the special refrigerating function of initiating terminal.
Background technology
Based on the high speed continuous rolling technology and controlled cooling technique using ultra-rapid cooling as core, i.e., TMCP techniques skill of new generation
Art, it can save steel main alloy element dosage on the premise of keeping or improving material plasticity and toughness and performance, reduce
The production cost of enterprise.For ultrafast cold cooling control system as strip roller repairing equipment, its technical characterstic is using high pressure spray
Mode is penetrated, breaks the steam film between strip and cooling water, realizes high-efficiency jet impingement heat transfer and nucleate boiling heat exchange, and then improve
The cooling velocity of strip.Therefore, the stabilization of pressure of supply water and flow is to realize high precision process temperature in ultrafast cold cooling system
The premise of control.
Up to the present, in order to ensure the pressure and stability of flow of ultrafast cold supply channel, the control mode generally used
It is responsible for the closed-loop control of loine pressure for supply equipment, i.e., by the fluid coupling or variable frequency pump and power frequency pump group of water supply pumping plant
Conjunction or the supply equipment that individually variable frequency pump is formed, carried out by adjusting fluid coupling opening degree or variable frequency pump working frequency
PID pressure closed loops control.
But due to pumping plant supply equipment apart from ultrafast cold live coolant valve farther out, pressure of supply water is conducted through in pipeline
Journey causes pressure closed loop control lag issues to be present, and is superimposed with the pressure in supply channel with the coupling of flow, makes
Supply channel pressure and flow after opening are concentrated under into ultrafast cold anticyclone control model in the short time of ultrafast cold coolant valve
Long-time big ups and downs, strip cooling procedure uniformity is influenceed, target coiling temperature on strip length direction can not be realized
High-precision control.
In actual production think gauge or high-strength rank strip, to prevent from batching generation piling of steel accident in region, need again
The special refrigerating function of strip initiating terminal is realized, i.e., is needed in strip initiating terminal setting length without water-spraying control, follow-up belt body
The control of water-spraying control to target coiling temperature requires.Due in current ultrafast cold anticyclone pattern down-off and pressure control strategy
Above mentioned problem be present, therefore also can not just realize the high-precision special cooling work(of strip initiating terminal under ultrafast cold anticyclone refrigerating mode
Energy.
The content of the invention
It is an object of the invention to provide one kind to realize the special refrigerating function of strip initiating terminal under ultrafast cold anticyclone control model
Control method.
For achieving the above object, used technical scheme is the present invention：
A kind of control method for realizing the special cooling of hot-strip initiating terminal, this method are applied to that hot rolling is ultrafast cold but to be controlled
In system processed, ultrafast cold water supply flow is individually controlled with pressure using distinct device, and variable frequency pump working frequency is adopted
Controlled, specifically included with staged raising frequency：
(1) variable frequency pump carries out water supply flow opened loop control, and variable frequency pump working frequency and water supply flow are measured, pass through data
Fit approach obtains variable frequency pump working frequency and water supply flow relation curve；
(2) bypass regulator valve door carries out pressure PID closed-loop controls；
(3) variable frequency pump working frequency is by benchmark job frequency FbaseRaising frequency is to desired value FtargetUsing staged raising frequency control
Mode processed；
(4) the ultrafast cold but valve response time is demarcated, and to strip initiating terminal Position Tracking Control.
Further, described a kind of control method for realizing the special cooling of hot-strip initiating terminal, the content (1) is middle to be become
The flow opened loop control operating procedure of frequency water supplying pump includes：
S1：Bypass regulator valve opening degree is arranged to 70%, by the opening and closing and the variable frequency pump that adjust ultrafast cold coolant valve
Working frequency, loine pressure is adjusted to target zone i.e. 0.85 ± 0.02MPa and meets that variable frequency pump delivery port water supply flow is
500m3/ h, record this moment variable frequency pump working frequency；
S2：Repeat above-mentioned S1 steps and be sequentially completed 1000m respectively3/h、1500m3/h、2000m3/h、2500m3/h、
3000m3/h、3500m3/h、4000m3/h、4500m3/h、5000m3Variable frequency pump working frequency in the case of/h；
S3：According to above-mentioned S2 steps measurement data, variable frequency pump working frequency is calculated with supplying using data fit approach
Water-carrying capacity relation curve, i.e. formula (1)：
Ftarget=f1(Flux) (1)
Wherein FtargetFor variable frequency pump target operating frequency；Automation receives based on Flux calculates from process computer
Obtained variable frequency pump water supply flow；
S4：According to the variable frequency pump working frequency that above-mentioned S3 steps obtain and water supply flow relation curve write-in basic automatization
Control program.
Further, described a kind of control method for realizing the special cooling of hot-strip initiating terminal, it is other in the content (2)
The pressure closed loop control of logical control valve includes content in detail below：
When it is (0.85+0.02) MPa that ultrafast cold supply channel pressure, which is more than control targe range limit, in pressure PID
Under closed-loop control, bypass regulator valve door opening degree be gradually increased to ultrafast cold supply channel pressure meet target zone i.e. 0.85 ±
In 0.02MPa；When it is (0.85-0.02) MPa that ultrafast cold supply channel pressure, which is less than control targe range lower limit, in pressure
Under PID closed-loop controls, bypass regulator valve door opening degree is gradually decrease to ultrafast cold supply channel pressure and meets target zone i.e.
In 0.85 ± 0.02MPa.
Further, described a kind of control method for realizing the special cooling of hot-strip initiating terminal, the content (3) is middle to be become
The control of frequency pump work frequency staged raising frequency includes content in detail below：
Variable frequency pump working frequency is needed by benchmark job frequency FbaseRaising frequency is to target operating frequency FtargetDuring, divide 4
Stage raising frequency, wherein being once a stage per 2s raising frequencies, raising frequency step delta F is calculated by formula (2)：
Δ F=(Ftarget-Fbase)/4 (2)
5. a kind of control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, its feature
It is：Ultrafast cold but valve response time calibrating includes content in detail below in the content (4)：
The ultrafast cold every upper and lower coolant valve response timeAndCalibration process refer in ultrafast cold pipeline pressure
In the case of power meets target control scope i.e. 0.85 ± 0.02MPa, each coolant valve is adjusted to start-up time extremely by closing
Cooling water reaches the time difference at belt steel surface moment, meanwhile, above-mentioned measurement result is safeguarded into basic automatization following function
Block of background data in.
Further, described a kind of control method for realizing the special cooling of hot-strip initiating terminal, band in the content (4)
Steel initiating terminal Position Tracking Control includes content in detail below：
Being based on basic automatization control mould is judged with ultrafast cold but valve location to strip initiating terminal in the operation of rolling
Its control process is judged according to formula (3), (4) to be realized to the micro- following function in position of strip initiating terminal in block：
When ultrafast cold i-th coolant valve meets condition (3), i-th closes with coolant valve；
When ultrafast cold i-th coolant valve meets condition (4), i-th opens with coolant valve；
Wherein LsFor the special cooling length of strip initiating terminal；For using last frame sting steel moment as 0 moment to t when
Carve accumulative rolled band steel distance；LiIt is ultrafast cold i-th ultrafast cold coolant valve apart from hot tandem end breast roller center
Positional distance；vt×ΔtiChange distance for the strip caused by i-th ultrafast cold coolant valve opening time-delaying time.
Present invention efficiently solves a large amount of piping flows caused by switching station in the ultrafast cold coolant valve short time and pressure
The problem of fluctuation, the flow of high service and the control accuracy of pressure are ensure that, so as to realize ultrafast cold anticyclone control model
The lower special cooling control function of strip initiating terminal.Meanwhile The present invention reduces equipment repair and the expense of maintenance, improve product
Lumber recovery, create good economic benefit.Advantages of the present invention specifically includes：
(1) ultrafast cold water supply flow is separately controlled by the present invention with pressure using distinct device, i.e., apart from ultrafast cold
The supply equipment of coolant valve farther out carries out flow opened loop control, the bypass regulator valve door nearer apart from ultrafast cold coolant valve enters
Row pressure closed loop controls.By such a control strategy, it can obviously reduce and be turned on and off being made by ultrafast cold coolant valve
Into piping flow and pressure coupling influence；
(2) present invention builds frequency conversion by measuring variable frequency pump working frequency and specified water supply flow using fit approach
Pump work frequency and water supply flow curve, to realize the opened loop control of ultrafast cold water supply flow；
(3) present invention realizes the pressure closed loop control of ultrafast cold pipeline, energy by being adjusted to bypass regulator valve door opening degree
Enough accelerate the stabilized speed of loine pressure；
(4) present invention proposes the staged raising frequency control strategy of ultrafast cold water supply variable frequency pump, can be effectively improved ultrafast
Build the pressure problem in supply channel caused by during coolant valve is not opened under cold anticyclone control model；
(5) present invention propose ultrafast cold but valve response delay measuring method and strip initiating terminal position tracking with
The decision method of ultrafast cold but Valve controlling, you can realize the special cooling of strip initiating terminal under ultrafast cold anticyclone control model
High precision length controls；
(6) the invention described above methods described and control function can pass through in the case where not increasing extras or server conditions
The programming of basic automatization control program can be achieved, using convenient.
Brief description of the drawings
Fig. 1 is the ultrafast cold piping flow and pressure-regulating device structure chart for representing embodiment of the present invention.
Fig. 2 is the control flow chart for representing embodiment of the present invention.
Fig. 3 is the variable frequency pump working frequency and water supply flow relation curve for representing the embodiment of the present invention.
Fig. 4 is the strip initiating terminal cooling Position Tracking Control schematic diagram for representing the embodiment of the present invention.
Fig. 5 is the special refrigerating function design sketch of strip initiating terminal for representing the embodiment of the present invention.
1 is variable frequency pump
2.a is ultrafast cold upper coolant valve, and 2.b is ultrafast cold lower coolant valve
3 be bypass regulator valve door
4 be ultrafast cold feed-tank
5 be hot tandem extreme trace time frame
6 be strip
Specific embodiment
Technical scheme is described further below in conjunction with drawings and Examples：
The special refrigerating mode of strip initiating terminal under the ultrafast cold anticyclone control model of the present embodiment is applied to the thick rule of hot rolling
In the production of lattice 16mm pipe line steels, capital equipment is as shown in Figure 1：It is ultrafast including 1 variable frequency pump, the ultrafast cold upper coolant valves of 2.a, 2.b
Cold lower coolant valve, 3 bypass regulator valve doors, 4 ultrafast cold feed-tanks etc..
As Fig. 2 illustrates the implementing procedure of the special refrigerating function of strip initiating terminal：
Step 1：Build variable frequency pump working frequency and water supply flow relation curve
Variable frequency pump working frequency and water supply flow relation song are obtained such as Fig. 3 institutes according to foregoing S1, S2 operating procedure of the present invention
Show, its relational expression is formula (5)：
Ftarget=(3E-07) Flux2+(0.0001)Flux+(40.197) (5)
Step 2：The response time measurement and modification of program of ultrafast cold coolant valve
In the embodiment, ultrafast cool equipment configures 3 groups of (BANK) coolant valves altogether as roller repairing equipment, and every group includes
Upper and lower each 10 of coolant valve.According to above-mentioned particular content (4) Suo Shu, surpassed by the way of rigid line connects execute-in-place
Rapid cooling valve response time measurement, measurement result are as shown in table 1：
The ultrafast cold but valve response time (s) of table 1
Above-mentioned measurement result is safeguarded to ultrafast cold basic automatization PLC (Siemens S7-400 series) block of background data
In, calculated for ultrafast cold coolant valve delay.
Step 3：The staged raising frequency control of variable frequency pump target operating frequency
Process computer issues variable frequency pump water supply flow Flux=3648m in this example3/ h, calculated by formula (5)
To variable frequency pump target operating frequency Ftarget=44.6Hz, originated by variable frequency pump of rolling mill " the stinging steel " signal of hot tandem the 2nd
Up-conversion signal, variable frequency pump working frequency is by benchmark job frequency Fbase=15Hz points of 4 staged raising frequency to desired values are Ftarget
=44.6Hz.
Step 4：The pressure closed loop control of bypath valve
In this example, ON moment, the pressure closed loop of bypath valve are changed into hot tandem the 2nd rolling mill " stinging steel " signal
Control, pipeline control targe pressure is 0.85 ± 0.02MPa, is controlled using PID/feedback.
Step 5：Strip initiating terminal judges to control with ultrafast cold but valve location
In this example, by basic automatization PLC programming i.e. can be achieved the operation of rolling in strip initiating terminal with it is ultrafast cold
Coolant valve position judgment control function, as shown in Figure 4.Decision condition is formula (3), (4), when i-th coolant valve meets
During formula (3), valve opening；When i-th coolant valve meets formula (4), valve is closed.
The control variable being directed to includes：Belt steel rolling speed v；Belt steel rolling time t；And measured in step 2
The response time Δ t of obtained ultrafast cold coolant valvei；
After the ultrafast cold anticyclone production special refrigerating function of strip initiating terminal comes into operation, realize strip initiating terminal and do not enter
The ultrafast cold water-spraying control of row, belt body are cooled to the function of target coiling temperature, after Fig. 5 show present invention implementation, roll pipeline
Steel X65, thickness specification 16.5mm, target coiling temperature are 520 DEG C, target initiating terminal special cooling length 3m when it is ultrafast cold
The controlling curve of loine pressure and Strip Steel Coiling Temperature：Initiating terminal high temperature length meets target call, and loine pressure controls
It is stable.
, can be easily real for those skilled in the art although embodiment of the present invention is disclosed as above
Now other modification, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited to
Specific details.
Claims (6)
- A kind of 1. control method for realizing the special cooling of hot-strip initiating terminal, it is characterised in that：This method surpasses applied to hot rolling In rapid cooling cooling control system, ultrafast cold water supply flow is individually controlled with pressure using distinct device, and variable frequency pump Working frequency is controlled using staged raising frequency, is specifically included：(1) variable frequency pump carries out water supply flow opened loop control, and variable frequency pump working frequency and water supply flow are measured, are fitted by data Mode obtains variable frequency pump working frequency and water supply flow relation curve；(2) bypass regulator valve door carries out pressure PID closed-loop controls；(3) variable frequency pump working frequency is by benchmark job frequency FbaseRaising frequency is to desired value FtargetUsing staged raising frequency controlling party Formula；(4) the ultrafast cold but valve response time is demarcated, and to strip initiating terminal Position Tracking Control.
- A kind of 2. control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, it is characterised in that： The flow opened loop control operating procedure of frequency conversion water supplying pump includes in the content (1)：S1：Bypass regulator valve opening degree is arranged to 70%, by the opening and closing and the frequency conversion pump work that adjust ultrafast cold coolant valve Frequency, loine pressure is adjusted to target zone i.e. 0.85 ± 0.02MPa and meets that variable frequency pump delivery port water supply flow is 500m3/ h, record this moment variable frequency pump working frequency；S2：Repeat above-mentioned S1 steps and be sequentially completed 1000m respectively3/h、1500m3/h、2000m3/h、2500m3/h、3000m3/h、 3500m3/h、4000m3/h、4500m3/h、5000m3Variable frequency pump working frequency in the case of/h；S3：According to above-mentioned S2 steps measurement data, variable frequency pump working frequency is calculated using data fit approach and flowed with supplying water Magnitude relation curve, i.e. formula (1)：Ftarget=f1(Flux) (1)Wherein FtargetFor variable frequency pump target operating frequency；Automation is received and is calculated from process computer based on Flux Variable frequency pump water supply flow；S4：According to the variable frequency pump working frequency that above-mentioned S3 steps obtain and the write-in basic automatization control of water supply flow relation curve Program.
- A kind of 3. control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, it is characterised in that： The pressure closed loop control of bypass regulator valve door includes content in detail below in the content (2)：When it is (0.85+0.02) MPa that ultrafast cold supply channel pressure, which is more than control targe range limit, in pressure PID closed loops Under control, bypass regulator valve door opening degree be gradually increased to ultrafast cold supply channel pressure meet target zone i.e. 0.85 ± In 0.02MPa；When it is (0.85-0.02) MPa that ultrafast cold supply channel pressure, which is less than control targe range lower limit, in pressure Under PID closed-loop controls, bypass regulator valve door opening degree is gradually decrease to ultrafast cold supply channel pressure and meets target zone i.e. In 0.85 ± 0.02MPa.
- A kind of 4. control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, it is characterised in that：Institute Stating variable frequency pump working frequency staged raising frequency control in content (3) includes content in detail below：Variable frequency pump working frequency is needed by benchmark job frequency FbaseRaising frequency is to target operating frequency FtargetDuring, point 4 stages Raising frequency, wherein being once a stage per 2s raising frequencies, raising frequency step delta F is calculated by formula (2)：Δ F=(Ftarget-Fbase)/4 (2)
- A kind of 5. control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, it is characterised in that： Ultrafast cold but valve response time calibrating includes content in detail below in the content (4)：The ultrafast cold every upper and lower coolant valve response timeAndCalibration process refer to expire in ultrafast cold loine pressure In the case of foot-eye control range is 0.85 ± 0.02MPa, each coolant valve is adjusted to start-up time to cooling down by closing Water reaches the time difference at belt steel surface moment, meanwhile, above-mentioned measurement result is safeguarded to the back of the body in basic automatization following function In scape data block.
- A kind of 6. control method for realizing the special cooling of hot-strip initiating terminal according to claim 1, it is characterised in that： Strip initiating terminal Position Tracking Control includes content in detail below in the content (4)：Being to be based in basic automatization control module is judged with ultrafast cold but valve location to strip initiating terminal in the operation of rolling Its control process is judged according to formula (3), (4) to be realized to the micro- following function in position of strip initiating terminal：<mrow> <munderover> <mo>&Integral;</mo> <mn>0</mn> <mi>t</mi> </munderover> <msub> <mi>f</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>v</mi> <mo>,</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>L</mi> <mi>s</mi> </msub> <mo><</mo> <msub> <mi>L</mi> <mi>i</mi> </msub> <mo>-</mo> <msub> <mi>v</mi> <mi>t</mi> </msub> <mo>&times;</mo> <msub> <mi>&Delta;t</mi> <mi>i</mi> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow><mrow> <munderover> <mo>&Integral;</mo> <mn>0</mn> <mi>t</mi> </munderover> <msub> <mi>f</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>v</mi> <mo>,</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>L</mi> <mi>s</mi> </msub> <mo>&GreaterEqual;</mo> <msub> <mi>L</mi> <mi>i</mi> </msub> <mo>-</mo> <msub> <mi>v</mi> <mi>t</mi> </msub> <mo>&times;</mo> <msub> <mi>&Delta;t</mi> <mi>i</mi> </msub> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>When ultrafast cold i-th coolant valve meets condition (3), i-th closes with coolant valve；When ultrafast cold i-th coolant valve meets condition (4), i-th opens with coolant valve；Wherein LsFor the special cooling length of strip initiating terminal；Add up to sting the steel moment using last frame as 0 moment to t Rolled band steel distance；LiFor ultrafast cold i-th ultrafast cold coolant valve apart from hot tandem end breast roller center away from From；vt×ΔtiChange distance for the strip caused by i-th ultrafast cold coolant valve opening time-delaying time.
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| CN201710624597.0A CN107442585B (en) | 2017-07-27 | 2017-07-27 | Control method for realizing special cooling of starting end of hot-rolled strip steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109174974A (en) * | 2018-08-31 | 2019-01-11 | 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 |
| CN114369707A (en) * | 2021-12-03 | 2022-04-19 | 首钢集团有限公司 | Strip steel without flat coil defect and color difference defect and preparation method and application thereof |
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| JPS5680320A (en) * | 1979-12-03 | 1981-07-01 | Nisshin Steel Co Ltd | Back tension applying method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109174974A (en) * | 2018-08-31 | 2019-01-11 | 东北大学 | A kind of ultrafast cooling system variable frequency water supply method of hot-rolling line |
| 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 |
| CN114369707A (en) * | 2021-12-03 | 2022-04-19 | 首钢集团有限公司 | Strip steel without flat coil defect and color difference defect and preparation method and application thereof |
| 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 |
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