CN104307891B - A kind of staged hot-strip produces line control method for laminar cooling - Google Patents
A kind of staged hot-strip produces line control method for laminar cooling Download PDFInfo
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- CN104307891B CN104307891B CN201410623816.XA CN201410623816A CN104307891B CN 104307891 B CN104307891 B CN 104307891B CN 201410623816 A CN201410623816 A CN 201410623816A CN 104307891 B CN104307891 B CN 104307891B
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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Abstract
The invention discloses a kind of staged hot-strip and produce line control method for laminar cooling, step is as follows: step one, strip steel head temperature set: laminar flow cooling control model compensates temperature and strip steel head finishing temperature by coiling temperature, ladder cooling, and laminar flow cooling control model calculates strip steel head needs the temperature of cooling；Step 2, strip steel head cooling scheme are arranged: laminar flow cooling control model needs the temperature of cooling and the speed of strip steel according to strip steel head, calculate the strip steel head section cooling water yield, determine the distribution of laminar cooling water nozzle further according to the cooling strategy in laminar flow cooling control model；In step 3, strip steel, tail temperature sets: laminar flow cooling control model calculates, according to the finishing temperature of afterbody in strip steel, the temperature that in strip steel, afterbody need to cool down；In step 4, strip steel, blade trailing cooling scheme is arranged.The present invention has and prevents strip steel head from digging on roller-way, avoids inner ring of steel coil folding and loose winding feature occur, it is possible to be widely used in hot-strip production field.
Description
Technical field
The present invention relates to hot-strip production field, particularly relate to a kind of staged hot-strip and produce line control method for laminar cooling.
Background technology
Along with the competition of the development of hot rolling technology and steel market, the thin material rolling of " with hot Dai Leng " becomes one of Main way of hot continuous rolling development.This is because CSP has congenital advantage in producing thin material: rolled piece homogeneous temperature, rolling stability are high, therefore, have the ability of large-scale production Thin Strip Steel.But the thin material for below thickness 2.0mm produces, due to strip steel threading speed height, rolled piece and equipment precision requirement high, conventional hot continuous rolling machine is difficulty with scale, steady production.
CSP (the CompactStripProduction of domestic many steel mills, close-coupled output strip line) produce line in thin material production process, often occur that the situations such as steel are dug or piled to strip steel on roller-way, or occur batching that rear strip steel head is folding or the problem such as inner ring of steel coil loose winding.
Summary of the invention
The invention aims to overcome the deficiency of above-mentioned background technology, there is provided a kind of staged hot-strip to produce line control method for laminar cooling, there is guarantee Thin Strip Steel stable operation on section cooling roller-way, prevent strip steel head from digging on roller-way, avoid inner ring of steel coil that folding and loose winding feature occurs.
A kind of staged hot-strip provided by the invention produces line control method for laminar cooling, comprising the steps: that step one, strip steel head temperature set: laminar flow cooling control model obtains the coiling temperature T2 that should control according to the steel grade produced and thickness, calculate ladder cooling compensation temperature T1 (cooling of described ladder compensates temperature and refers to the temperature approach between coiling temperature T2 and strip steel head target control temperature simultaneously；Coiling temperature T2 is the laminar flow cooling control model yield strength according to strip steel, tensile strength and elongation percentage calculate and obtain, if but defer to coiling temperature T2 completely as controlling target, can cause occurring that strip steel is dug on roller-way or piles the situations such as steel as mentioned in the background art, or occur batching that rear strip steel head is folding or the problem such as inner ring of steel coil loose winding, need in this case strip steel head target control temperature is adjusted, introduce ladder cooling and compensate temperature T1, make do not affecting strip steel yield strength, under the premise of tensile strength and elongation percentage, accomplish to ensure Thin Strip Steel stable operation on section cooling roller-way, prevent strip steel head from digging on roller-way, avoid inner ring of steel coil that folding and loose winding appearance occurs, the strip steel head target control temperature after temperature T1 is compensated compared with coiling temperature T2 owing to introducing ladder cooling, in coordinate diagram just as the ladder declined suddenly, the ladder that hence obtains one's name cooling compensates temperature T1, steel defect owing to being previously mentioned in background technology only occurs in strip steel head, in strip steel, afterbody does not have this defect, so the temperature of afterbody in strip steel is controlled at coiling temperature T2, temperature T1 control is compensated) without introducing ladder cooling, obtain strip steel head target control temperature T2+ T1；When strip steel head enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of strip steel head, and laminar flow cooling control model calculates strip steel head needs the temperature T1-T2-T1 of cooling；Step 2, strip steel head cooling scheme are arranged: laminar flow cooling control model needs the temperature T1-T2-T1 of cooling and the speed V of strip steel according to strip steel head, converse strip steel head section cooling water yield h1, determine the cooling distribution of laminar cooling water nozzle further according to the cooling strategy in laminar flow cooling control model；In step 3, strip steel, tail temperature sets: when in strip steel, afterbody enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of afterbody in strip steel, and laminar flow cooling control model calculates afterbody in strip steel needs the temperature T1-T2 of cooling；In step 4, strip steel, blade trailing cooling scheme is arranged: temperature T1-T2, the speed V of strip steel and time that laminar flow cooling control model cools down according to afterbody needs in strip steel are integrated calculating, converse afterbody section cooling water yield h2 in strip steel, the cooling distribution of laminar cooling water nozzle is determined further according to the cooling strategy in laminar flow cooling control model, in cooling procedure, the water yield dynamically adjusts, realize coiling temperature T2 according to target to control, until strip steel cooling terminates.
In technique scheme, also include step 5, self study correction: laminar flow cooling control model can be modified according to the head temperature batching this block steel that pyrometer records or upper block steel, revising the coiling temperature T2 of afterbody in strip steel, correction value is T2, it is achieved being precisely controlled of strip steel head temperature.
In technique scheme, in described step 5, described self study correction includes short-term self study and long-term self study, and described short-term self study is the head temperature for this block strip steel, the coiling temperature T2 of afterbody in laminar flow cooling control Modifying model this block strip steel；Described long-term self study is for lower piece of strip steel in cooling procedure, and laminar flow cooling control model can according to the coiling temperature T2 of afterbody in block strip steel under the head temperature correction of upper piece strip steel.
In technique scheme, described strip steel head≤5m.
In technique scheme, described section cooling roller-way is divided into fine setting section and accurate adjustment section, and described fine setting section is presetting section, and described accurate adjustment section is the dynamically section of adjustment.
Staged hot-strip of the present invention produces line control method for laminar cooling, have the advantages that the present invention adopts the stepped type of cooling to control the coiling temperature of strip steel head, namely on the basis of former coiling temperature, by positive and negative compensation strip steel head temperature, by the oiler temperature control of strip steel head within the specific limits, realize strip steel head plate shape, glacing flatness and hardness moderate, guarantee that strip steel head is in even running, realize Thin Strip Steel batch smoothly and after rolling scroll good, concrete effect is as follows:
1. the present invention does not need reforming equipment in implementation process, existing equipment and control just can use；
2. the present invention is applicable to the production of all hot rolling thin strips, adopt the method substantially can eliminate strip steel digging on roller-way, pile steel and inner ring of steel coil is folding, the generation of loose winding, according to statistics, the probability that strip steel is dug on roller-way is dropped to 0.2% by 15%, and inner ring of steel coil is folding, the probability of loose winding is dropped within 0.5% by 8%；
3. the present invention is simple and easy to do, easily operated, practical.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that staged hot-strip of the present invention produces line control method for laminar cooling；
When Fig. 2 is that in staged hot-strip of the present invention product line control method for laminar cooling, ladder cooling compensation temperature is negative, coiling temperature compares schematic diagram with strip steel head target control temperature；
When Fig. 3 is that in staged hot-strip of the present invention product line control method for laminar cooling, ladder cooling compensation temperature is positive number, coiling temperature compares schematic diagram with strip steel head target control temperature；
Fig. 4 is that staged hot-strip of the present invention produces the structural representation of fine setting section and accurate adjustment section in line control method for laminar cooling.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
Referring to Fig. 1, staged hot-strip of the present invention produces line control method for laminar cooling, comprises the steps:
Step one, strip steel head temperature set (described strip steel head≤5m): laminar flow cooling control model obtains the coiling temperature T2 that should control according to the steel grade produced and thickness, and calculate ladder cooling compensation temperature T1 (cooling of described ladder compensates temperature and refers to the temperature approach between coiling temperature T2 and strip steel head target control temperature simultaneously；Coiling temperature T2 is the laminar flow cooling control model yield strength according to strip steel, tensile strength and elongation percentage calculate and obtain, if but defer to coiling temperature T2 completely as controlling target, can cause occurring that strip steel is dug on roller-way or piles the situations such as steel as mentioned in the background art, or occur batching that rear strip steel head is folding or the problem such as inner ring of steel coil loose winding, need in this case strip steel head target control temperature is adjusted, introduce ladder cooling and compensate temperature T1, make do not affecting strip steel yield strength, under the premise of tensile strength and elongation percentage, accomplish to ensure Thin Strip Steel stable operation on section cooling roller-way, prevent strip steel head from digging on roller-way, avoid inner ring of steel coil that folding and loose winding appearance occurs, the strip steel head target control temperature after temperature T1 is compensated compared with coiling temperature T2 owing to introducing ladder cooling, in coordinate diagram just as the ladder declined suddenly, the ladder that hence obtains one's name cooling compensates temperature T1, steel defect owing to being previously mentioned in background technology only occurs in strip steel head, in strip steel, afterbody does not have this defect, so the temperature of afterbody in strip steel is controlled at coiling temperature T2, temperature T1 control is compensated) without introducing ladder cooling, obtain strip steel head target control temperature T2+ T1；When strip steel head enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of strip steel head, and laminar flow cooling control model calculates strip steel head needs the temperature T1-T2-T1 of cooling；
Step 2, strip steel head cooling scheme are arranged: laminar flow cooling control model needs the temperature T1-T2-T1 of cooling and the speed V of strip steel according to strip steel head, converse strip steel head section cooling water yield h1, determine the cooling distribution of laminar cooling water nozzle further according to the cooling strategy in laminar flow cooling control model；
In step 3, strip steel, tail temperature sets: when in strip steel, afterbody enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of afterbody in strip steel, and laminar flow cooling control model calculates afterbody in strip steel needs the temperature T1-T2 of cooling；
In step 4, strip steel, blade trailing cooling scheme is arranged: temperature T1-T2, the speed V of strip steel and time that laminar flow cooling control model cools down according to afterbody needs in strip steel are integrated calculating, converse afterbody section cooling water yield h2 in strip steel, the cooling distribution of laminar cooling water nozzle is determined further according to the cooling strategy in laminar flow cooling control model, in cooling procedure, the water yield dynamically adjusts, realize coiling temperature T2 according to target to control, until strip steel cooling terminates；
Step 5, self study correction: laminar flow cooling control model can be modified according to the head temperature batching this block steel that pyrometer records or upper block steel, revise the coiling temperature T2 of afterbody in strip steel, correction value is T2, realize being precisely controlled of strip steel head temperature, in the present embodiment, described self study correction includes short-term self study and long-term self study, and described short-term self study is the head temperature for this block strip steel, the coiling temperature T2 of afterbody in laminar flow cooling control Modifying model this block strip steel；Described long-term self study is for lower piece of strip steel in cooling procedure, and laminar flow cooling control model can according to the coiling temperature T2 of afterbody in block strip steel under the head temperature correction of upper piece strip steel.
Referring to Fig. 2, on the basis of former coiling temperature, by negative compensation strip steel head temperature, by the oiler temperature control of strip steel head, in OK range, (horizontal line the highest in figure is the finishing temperature T1 that finish to gauge pyrometer records strip steel head, middle horizontal line is coiling temperature T2, minimum horizontal line is strip steel head target control temperature T2+ T1, and middle and between level of subsistence distance is ladder cooling and compensates temperature T1).
Referring to Fig. 3, on the basis of former coiling temperature, by just compensating strip steel head temperature, by the oiler temperature control of strip steel head, in OK range, (horizontal line the highest in figure is the finishing temperature T1 that finish to gauge pyrometer records strip steel head, middle horizontal line is strip steel head target control temperature T2+ T1, minimum horizontal line is coiling temperature T2, and middle and between level of subsistence distance is ladder cooling and compensates temperature T1).
The present invention is applicable to the belt steel thickness thin material strip steel less than 2.0mm, and concrete steel grade and thickness are referring to table 1 below:
Steel grade pressed by table 1 and belt steel thickness sets ladder cooling and compensates temperature
Below by way of specific embodiment, the present invention is made elaboration:
Embodiment one:
Steel grade: SPHC, thickness 1.2mm, coiling temperature 660 DEG C, ladder cooling compensates temperature-10 DEG C, cools down by the ladder shown in Fig. 2 and compensates temperature execution, strip steel head starts to calculate, 0～5m temperature presses 650 DEG C of controls, according to target coiling temperature 660 DEG C control after 5m, in process of production, not occurring strip steel to dig on roller-way, pile steel phenomenon, after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment two:
Steel grade: SPHC, thickness 1.8mm, coiling temperature 640 DEG C, ladder cooling compensates temperature-10 DEG C, cools down by the ladder shown in Fig. 2 and compensates temperature execution, strip steel head starts to calculate, 0～1m temperature presses 630 DEG C of controls, according to target coiling temperature 640 DEG C control after 5m, in process of production, not occurring strip steel to dig on roller-way, pile steel phenomenon, after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment three:
Steel grade: Q215, thickness 1.1mm, coiling temperature 600 DEG C, ladder cooling compensates temperature+50 DEG C, cool down by the ladder shown in Fig. 3 and compensate temperature execution, strip steel head starts to calculate, and 0～10m temperature presses 650 DEG C of controls, according to target coiling temperature 600 DEG C control after 10m, in process of production, strip steel has on roller-way slightly to be dug, it does not have heap steel phenomenon, and after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment four:
Steel grade: Q235, thickness 1.5mm, coiling temperature 570 DEG C, ladder cooling compensates temperature+60 DEG C, cools down by the ladder shown in Fig. 3 and compensates temperature execution, strip steel head starts to calculate, 0～3m temperature presses 630 DEG C of controls, according to target coiling temperature 570 DEG C control after 3m, in process of production, strip steel is without digging, piling steel phenomenon on roller-way, and after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment five:
Steel grade: Q345, thickness 1.4mm, coiling temperature 660 DEG C, ladder cooling compensates temperature-10 DEG C, cools down by the ladder shown in Fig. 2 and compensates temperature execution, strip steel head starts to calculate, 0～2m temperature presses 650 DEG C of controls, according to target coiling temperature 660 DEG C control after 2m, in process of production, strip steel is without digging, piling steel phenomenon on roller-way, and after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment six:
Steel grade: Q460, thickness 2.0mm, coiling temperature 640 DEG C, ladder cooling compensates temperature-10 DEG C, cools down by the ladder shown in Fig. 2 and compensates temperature execution, strip steel head starts to calculate, 0～1m temperature presses 630 DEG C of controls, according to target coiling temperature 640 DEG C control after 1m, in process of production, strip steel is without digging, piling steel phenomenon on roller-way, and after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Embodiment seven:
Steel grade: SPA-H, thickness 1.6mm, coiling temperature 600 DEG C, ladder cooling compensates temperature+80 DEG C, cools down by the ladder shown in Fig. 3 and compensates temperature execution, strip steel head starts to calculate, 0～3m temperature presses 680 DEG C of controls, according to target coiling temperature 600 DEG C control after 3m, in process of production, strip steel is without digging, piling steel phenomenon on roller-way, and after strip steel rolling, inner ring of steel coil does not occur head folding and inner ring of steel coil loose winding phenomenon.
Referring to Fig. 4, described section cooling roller-way is divided into fine setting section and accurate adjustment section, and described fine setting section is presetting section, and described accurate adjustment section is the dynamically section of adjustment.Because in section cooling, the coiling temperature T2 of different steel grades and thickness of slab is bigger with strip steel head target control temperature T2+ T1 difference, so the water nozzle run in fine setting section and accurate adjustment section accounts for the ratio of all water nozzles from 30%～100% not etc., when cooling is many compared with the water nozzle opened time big, on the contrary then few.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1. a staged hot-strip produces line control method for laminar cooling, it is characterised in that: comprise the steps:
Step one, strip steel head temperature set: laminar flow cooling control model obtains the coiling temperature T2 that should control according to the steel grade produced and thickness, calculate ladder cooling simultaneously and compensate temperature T1, obtain strip steel head target control temperature T2+ T1；When strip steel head enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of strip steel head, and laminar flow cooling control model calculates strip steel head needs the temperature T1-T2-T1 of cooling；
Step 2, strip steel head cooling scheme are arranged: laminar flow cooling control model needs the temperature T1-T2-T1 of cooling and the speed V of strip steel according to strip steel head, converse strip steel head section cooling water yield h1, determine the cooling distribution of laminar cooling water nozzle further according to the cooling strategy in laminar flow cooling control model；
In step 3, strip steel, tail temperature sets: when in strip steel, afterbody enters section cooling roller-way, it is T1 that finish to gauge pyrometer records the finishing temperature of afterbody in strip steel, and laminar flow cooling control model calculates afterbody in strip steel needs the temperature T1-T2 of cooling；
In step 4, strip steel, blade trailing cooling scheme is arranged: temperature T1-T2, the speed V of strip steel and time that laminar flow cooling control model cools down according to afterbody needs in strip steel are integrated calculating, converse afterbody section cooling water yield h2 in strip steel, the cooling distribution of laminar cooling water nozzle is determined further according to the cooling strategy in laminar flow cooling control model, in cooling procedure, the water yield dynamically adjusts, realize coiling temperature T2 according to target to control, until strip steel cooling terminates.
2. staged hot-strip according to claim 1 produces line control method for laminar cooling, it is characterized in that: also include step 5, self study correction: laminar flow cooling control model can be modified according to the head temperature batching this block steel that pyrometer records or upper block steel, revise the coiling temperature T2 of afterbody in strip steel, correction value is T2, it is achieved being precisely controlled of strip steel head temperature.
3. staged hot-strip according to claim 2 produces line control method for laminar cooling, it is characterized in that: in described step 5, described self study correction includes short-term self study and long-term self study, described short-term self study is the head temperature for this block strip steel, the coiling temperature T2 of afterbody in laminar flow cooling control Modifying model this block strip steel；Described long-term self study is for lower piece of strip steel in cooling procedure, and laminar flow cooling control model can according to the coiling temperature T2 of afterbody in block strip steel under the head temperature correction of upper piece strip steel.
4. staged hot-strip according to any one of claim 1 to 3 produces line control method for laminar cooling, it is characterised in that: described strip steel head≤5m.
5. staged hot-strip according to any one of claim 1 to 3 produces line control method for laminar cooling, it is characterised in that: described section cooling roller-way is divided into fine setting section and accurate adjustment section, and described fine setting section is presetting section, and described accurate adjustment section is the dynamically section of adjustment.
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| CN107716561A (en) * | 2017-09-15 | 2018-02-23 | 首钢京唐钢铁联合有限责任公司 | Strip steel coiling temperature control method and device, computer storage medium and equipment |
| CN111215456B (en) * | 2018-11-23 | 2021-10-22 | 宝山钢铁股份有限公司 | Method for controlling threading stability of strip steel in hot-rolling laminar cooling area |
| CN112122361B (en) * | 2019-06-25 | 2022-10-14 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for preventing medium-high carbon steel from cracking |
| CN110340156B (en) * | 2019-07-31 | 2020-11-20 | 首钢京唐钢铁联合有限责任公司 | Strip steel coiling temperature control method and device and strip steel processing system |
| CN110877055B (en) * | 2019-10-31 | 2020-12-22 | 河钢股份有限公司承德分公司 | Method for improving hot-rolled steel strip tail coiling temperature hit |
| CN111451290A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Production method for preventing thin strip steel head from being folded |
| CN116144888B (en) * | 2023-02-01 | 2024-02-20 | 北京科技大学 | Double-phase steel plate strip homogenizing hanging coil and cooling control quality adjusting method based on transverse and longitudinal temperature difference |
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| JPH0390206A (en) * | 1989-08-31 | 1991-04-16 | Kobe Steel Ltd | Control method for cooling of hot rolled steel plate |
| JPH03277721A (en) * | 1990-03-28 | 1991-12-09 | Sumitomo Metal Ind Ltd | Method for controlling cooling of hot rolled steel strip |
| CN101745551B (en) * | 2008-12-11 | 2011-11-23 | 宝山钢铁股份有限公司 | Free cooling method of hot rolling band steel |
| CN203170736U (en) * | 2013-03-15 | 2013-09-04 | 重庆钢铁(集团)有限责任公司 | Hot rolling laminar flow cooling temperature control device |
| CN203541110U (en) * | 2013-10-28 | 2014-04-16 | 武汉钢铁(集团)公司 | Sectional type laminar cooling system |
| CN104131238B (en) * | 2014-06-30 | 2016-08-24 | 武汉钢铁(集团)公司 | High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof |
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Effective date of registration: 20170728 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |