CN108393359A - A kind of milling method of wedge shape LP steel plates - Google Patents
A kind of milling method of wedge shape LP steel plates Download PDFInfo
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- CN108393359A CN108393359A CN201710068959.2A CN201710068959A CN108393359A CN 108393359 A CN108393359 A CN 108393359A CN 201710068959 A CN201710068959 A CN 201710068959A CN 108393359 A CN108393359 A CN 108393359A
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/08—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 de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2205/00—Particular shaped rolled products
- B21B2205/04—Taper- or wedge-shaped profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The present invention relates to a kind of milling methods of wedge shape LP steel plates, including：1) billet heating temperature scope control；2) high-pressure water descaling；3) after rolling starts, each passage continuously changes roll gap distance by controlling the variation of rolling mill hydraulic cylinder oil column height, by every time iterative calculation, realizes the consecutive variations of steel plate longitudinal thickness；The roll gap self study coefficient of milling train preset model is adjusted according to the actual (real) thickness of steel plate simultaneously；Control start rolling temperature, finishing temperature, reduction ratio, mill speed simultaneously；4) control the beginning of cooling temperature, red temperature and cooling velocity；The present invention is effectively improved plate shape, surface quality and the overall performance of wedge-shaped LP steel plates, the wedge-shaped steel plate big especially suitable for thickness change range production, and operability is strong, production efficiency is high by being accurately controlled to heating, rolling and cooling procedure.
Description
Technical field
The present invention relates to metallurgical technology field more particularly to a kind of milling methods of wedge shape LP steel plates.
Background technology
LP (longitudinal variable-thickness) steel plate refers to steel plate with special longitudinal shape of the thickness along rolling direction consecutive variations,
It is to change the steel plate of longitudinal thickness by continuously changing the opening degree of roll during the rolling process.Due to longitudinal thickness-variable steel plate
Its thickness can be changed according to load bearing situation, thus the design of the structure sections such as bridge, hull, building can be optimized, no
Can only reduce rolled steel dosage, reduce welding times, and can by the uniform thicknessization of junction improve operability, such as omit backing plate and
Taper WEDM etc..
Application No. is the Chinese patent of CN200910175208.6, a kind of " thickness for rolling wedge-shaped steel plate is disclosed
The operation of rolling of control method ", wedge-shaped steel plate is：Preceding several passages are rolled according to conventional rectangular steel plate rolling technology, extreme trace
It is continuous to change roll gap distance by the control rolling mill hydraulic cylinder oil column height variation of TDC controllers, realize the continuous of steel plate longitudinal thickness
Variation；Since this method is time to roll out lateral wedge-shaped steel plate in the extreme trace of rolling, that is, only completed by a time rolling
The rolling of wedge-shaped steel plate necessarily causes its thickness change range smaller, the poor problem of steel plate template.
Application No. is the Chinese patent of CN201310227028.4, a kind of " transverse wedge-shaped rolled thickness-variable steel plate is disclosed
Production method ", including cross rolling：In transverse rolling stage end passes, set according to steel plate head and tail portion average thickness
Definite value carries out longitudinal variable cross-section rolling to steel plate；Longitudinal rolling；First, it in the axial rolling stage, is generated end to end according to the transverse rolling stage
Longitudinal variable-thickness value carries out lateral equal proportion wedge rolling；Then, it is determined using influence function method according to rolling procedure distribution
Roll gap adjustment amount and bending roller force setting value ensure that the transverse gage distribution of axial rolling passage meets the requirement of equal proportion wedge shape.Due to this
Method is to roll out lateral wedge-shaped steel plate in the extreme trace time setting roll gap parameter of cross rolling, necessarily leads to its thickness change range
Smaller, steel plate template is poor and correction can not be carried out on straightener causes useless plate rate to increase.
Application No. is the Chinese patent of CN200610046457.1, a kind of " continuous rolling side of variable-thickness steel plate is disclosed
Method ", first steel plate respectively reserve certain allowance end to end, and to shut out minimum thickness, rolled piece precomputation is calculated according to rolling force model
Plastic curve determines the roll gap of roll then in conjunction with mill spring curve, is then rolled under the roll gap；It is rolled on head
It calculates in the process and shuts out length, until shutting out length is equal to L；After the completion of the transition stage rolling of head, continues Varying-thickness and roll
System；According to the variation of variable thickness rolled length, roll gap is adjusted correspondingly；The rolling process persistently carries out, until thickeing
Degree section shuts out length and is equal to L, and the thickness of rolled piece has transferred to maximum gauge at this time, carries out tail portion rolling later, based on estimated
Deviation existing for plastic curve and practical plastic curve is calculated, in the operation of rolling of tail portion, according to the practical difference for calculating exit thickness
Not, by adjusting the position of roll gap, tail portion thickness deviation is eliminated, until tail portion rolling is completed.Use the method for the present invention can be with
Conveniently technique continuous rolling variable-thickness steel plate.This method is rolled using segmented, can be caused in actually producing in batches
Low production efficiency controls the disadvantage for stablizing difference.
By being analyzed above it is found that wedge shape LP Plate Productions have following deficiency at present：
1) steel plate thickness variation specification is smaller, narrow application range；
2) use the wedge shape of extreme trace time rolled plate, control accuracy poor；
3) production technology is complicated, low production efficiency, and control stability is poor.
Invention content
The present invention provides a kind of milling methods of wedge shape LP steel plates, by the accurate of heating, rolling and cooling procedure
Control, is effectively improved plate shape, surface quality and the overall performance of wedge-shaped LP steel plates, the wedge big especially suitable for thickness change range
Shape Plate Production, and operability is strong, production efficiency is high.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of milling method of wedge shape LP steel plates, the longitudinal cross-section of the wedge shape LP steel plates is symmetrical along center line, length
For L, and L >=1500mm；The thin end thickness of wedge-shaped LP steel plates is h1, thick end thickness is L2, and L2-L1≤60mm；Wedge-shaped LP steel plates
Milling method include the following steps：
1) heating steel billet technique：Billet heating temperature scope control is at 1185~1210 DEG C, and steel billet upper surface temperature ratio
Underlaying surface temperature is 20~30 DEG C high；
2) after steel billet is come out of the stove, the high-pressure water descaling through pressure >=15MPa；
3) rolling mill practice：Start rolling temperature is controlled at 1150~1180 DEG C, and finishing temperature control is at 1050~1080 DEG C；Rolling
Total reduction >=30%, single pass reduction ratio >=10%；Steel plate rolling speed control is in 2~10m/s；
Rolling start after, each passage by control rolling mill hydraulic cylinder oil column height variation come continuously change roll gap away from
From, pass through every time iterative calculation, realize steel plate longitudinal thickness consecutive variations；Simultaneously according to the actual (real) thickness tune of steel plate
The roll gap self study coefficient of whole milling train preset model measures steel plate actual (real) thickness, by actual (real) thickness by thickness measurement equipment
Compared with theoretic throat, obtain from roll gap self study coefficient L1；Specific calculating process is as follows：
L=N × (MFH-GMH)
L1=B1×L+(1-B1)×L
Wherein：L--- roll gap self study coefficients；
N--- penalty coefficients；
MFH--- measurement of the steel plate thickness；
GMH--- steel plate theoretic throats；
L1--- the current calculated value of roll gap self study coefficient；
B1--- smoothing factor；
According to the current calculated value L of roll gap self study coefficient1Gap values between rollers Gap is calculated, dynamic adjusts mill roll-gap, realizes wedge shape
The rolling of LP steel plates, Gap computational methods are as follows：
In formula：Gap--- roll gap setup algorithm values；
Fh--- strip exit thickness setup algorithm values；
Gwid.lay1--- width compensation gains；
WCX--- width compensations；
Goil.Lay1--- Oil Film Compensation gains；
M--- milling train constants；
S--- has load roll gap；
S0--- roll gap when roll is demarcated；
F--- oil-film forces；
F0--- oil-film force when calibration；
4) cooling technique：The beginning of cooling temperature is 1000~1050 DEG C, and red temperature is 660~750 DEG C；Cooling velocity is
8~20 DEG C/s.
For being modified to self study mathematical model, the value range of N is the penalty coefficient N：
Wedge-shaped LP steel plates h1For 10~80mm when, N be 0.10~0.12；
Wedge-shaped LP steel plates h1For 81~130mm when, N be 0.15~0.20；
Wedge-shaped LP steel plates h1When more than 130mm, N values are 0.5.
Compared with prior art, the beneficial effects of the invention are as follows：
1) by being accurately controlled to heating, rolling and cooling procedure, plate shape, the surface matter of wedge-shaped LP steel plates are effectively improved
Amount and overall performance, 97% or more plate shape qualification rate, product qualification rate 100%；
2) wedge-shaped steel plate big especially suitable for thickness change range production；
3) technical process is simple, and operability is strong, and production efficiency is high.
Description of the drawings
Fig. 1 is the structural schematic diagram of wedge shape LP steel plates of the present invention.
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings：
The milling method of a kind of wedge shape LP steel plates of the present invention, as shown in Figure 1, the longitudinal cross-section of the wedge shape LP steel plates
It is symmetrical along center line, the length of L, and L >=1500mm；The thin end thickness of wedge-shaped LP steel plates is h1, thick end thickness is L2, and L2-
L1≤60mm；The milling method of wedge-shaped LP steel plates includes the following steps：
1) heating steel billet technique：Billet heating temperature scope control is at 1185~1210 DEG C, and steel billet upper surface temperature ratio
Underlaying surface temperature is 20~30 DEG C high；
2) after steel billet is come out of the stove, the high-pressure water descaling through pressure >=15MPa；
3) rolling mill practice：Start rolling temperature is controlled at 1150~1180 DEG C, and finishing temperature control is at 1050~1080 DEG C；Rolling
Total reduction >=30%, single pass reduction ratio >=10%；Steel plate rolling speed control is in 2~10m/s；
Rolling start after, each passage by control rolling mill hydraulic cylinder oil column height variation come continuously change roll gap away from
From, pass through every time iterative calculation, realize steel plate longitudinal thickness consecutive variations；Simultaneously according to the actual (real) thickness tune of steel plate
The roll gap self study coefficient of whole milling train preset model measures steel plate actual (real) thickness, by actual (real) thickness by thickness measurement equipment
Compared with theoretic throat, obtain from roll gap self study coefficient L1；Specific calculating process is as follows：
L=N × (MFH-GMH)
L1=B1×L+(1-B1)×L
Wherein：L--- roll gap self study coefficients；
N--- penalty coefficients；
MFH--- measurement of the steel plate thickness；
GMH--- steel plate theoretic throats；
L1--- the current calculated value of roll gap self study coefficient；
B1--- smoothing factor；
According to the current calculated value L of roll gap self study coefficient1Gap values between rollers Gap is calculated, dynamic adjusts mill roll-gap, realizes wedge shape
The rolling of LP steel plates, Gap computational methods are as follows：
In formula：Gap--- roll gap setup algorithm values；
Fh--- strip exit thickness setup algorithm values；
Gwid.lay1--- width compensation gains；
WCX--- width compensations；
Goil.Lay1--- Oil Film Compensation gains；
M--- milling train constants；
S--- has load roll gap；
S0--- roll gap when roll is demarcated；
F--- oil-film forces；
F0--- oil-film force when calibration；
4) cooling technique：The beginning of cooling temperature is 1000~1050 DEG C, and red temperature is 660~750 DEG C；Cooling velocity is
8~20 DEG C/s.
For being modified to self study mathematical model, the value range of N is the penalty coefficient N：
Wedge-shaped LP steel plates h1For 10~80mm when, N be 0.10~0.12；
Wedge-shaped LP steel plates h1For 81~130mm when, N be 0.15~0.20；
Wedge-shaped LP steel plates h1When more than 130mm, N values are 0.5.
Following embodiment is being implemented down based on the technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment 1】
Roll the wedge-shaped LP steel plates that steel grade is Q420C, wedge-shaped LP steel plates finished product thickness h1For 135mm, h2For 155mm, length
L is 1500mm.The specific operation of rolling is as follows：
Billet heating temperature is 1210 DEG C, and upper surface temperature is 20 DEG C higher than underlaying surface temperature,
Through the high-pressure water descaling that excess pressure is 15MPa；
Start rolling temperature is 1180 DEG C, and finishing temperature is 1080 DEG C, and total reduction 30%, single pass reduction ratio is not less than
10%, steel plate rolling speed is 5m/s；
Penalty coefficient N takes 0.5；
The beginning of cooling temperature is 1000 DEG C, and red temperature is 750 DEG C, and cooling velocity is 10 DEG C/s；
Wedge-shaped LP steel plates finished product is through examining, and yield strength 432Mpa, 20 DEG C of ballistic works are 120J, meet test stone and want
It asks, plate shape qualification rate is 97.3%.
【Embodiment 2】
Roll the wedge-shaped LP steel plates that steel grade is Q345C, wedge-shaped LP steel plates finished product thickness h1For 10mm, h2For 65mm, length L
For 8000mm.The specific operation of rolling is as follows：
Billet heating temperature is 1185 DEG C, and upper surface temperature is 20 DEG C higher than underlaying surface temperature；
Through the high-pressure water descaling that excess pressure is 15MPa；
Start rolling temperature is 1150 DEG C, and finishing temperature is 1020 DEG C, and total reduction 45%, single pass reduction ratio is not less than
8%, steel plate rolling speed is 8m/s；
Penalty coefficient N takes 0.11；
The beginning of cooling temperature is 1000 DEG C, and red temperature is 750 DEG C, and cooling velocity is 20 DEG C/s；
Wedge-shaped LP steel plates finished product is through examining, and yield strength 405Mpa, -20 DEG C of ballistic works are 85J, meet test stone and want
It asks, plate shape qualification rate is 97.6%.
【Embodiment 3】
Roll the wedge-shaped LP steel plates that steel grade is Q235C, wedge-shaped steel plate finished product thickness h1For 86mm, h2It is for 128mm, length L
2000mm.The specific operation of rolling is as follows：
Billet heating temperature is 1210 DEG C, and upper surface temperature is 20 DEG C higher than underlaying surface temperature；
Through the high-pressure water descaling that excess pressure is 15MPa；
Start rolling temperature is 1160 DEG C, and finishing temperature is 1060 DEG C, and total reduction 45%, single pass reduction ratio is not less than
8%, steel plate rolling speed is 4.5m/s；
Penalty coefficient N takes 0.16；
The beginning of cooling temperature is 1020 DEG C, and red temperature is 680 DEG C, and cooling velocity is 10 DEG C/s；
Wedge-shaped LP steel plates finished product is through examining, and yield strength 260Mpa, 20 DEG C of ballistic works are 225J, meet test stone and want
It asks, plate shape qualification rate is 97.7%.
【Embodiment 4】
Roll the wedge-shaped LP steel plates that steel grade is Q345D, wedge-shaped LP steel plates finished product thickness h1For 80mm, h2For 126mm, length L
For 3000mm.The specific operation of rolling is as follows：
Billet heating temperature is 1190 DEG C, and upper surface is 20 DEG C higher than lower surface；
Through the high-pressure water descaling that excess pressure is 15MPa；
Start rolling temperature is 1160 DEG C, and finishing temperature is 1055 DEG C, and total reduction 55%, single pass reduction ratio is not less than
8%, steel plate rolling speed is .4m/s；
Penalty coefficient N takes 0.18；
The beginning of cooling temperature is 1030 DEG C, and red temperature is 720 DEG C, and cooling velocity is 8 DEG C/s；
Wedge-shaped LP steel plates finished product is through examining, and yield strength 412Mpa, 0 DEG C of ballistic work is 135J, meets test stone and wants
It asks, plate shape qualification rate is 98.2%.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of milling method of wedge shape LP steel plates, which is characterized in that the longitudinal cross-section of the wedge shape LP steel plates is along center line pair
Claim, the length of L, and L >=1500mm；The thin end thickness of wedge-shaped LP steel plates is h1, thick end thickness is L2, and L2-L1≤60mm；
The milling method of wedge-shaped LP steel plates includes the following steps：
1) heating steel billet technique：Billet heating temperature scope control is at 1185~1210 DEG C, and steel billet upper surface temperature compares following table
Face temperature is 20~30 DEG C high；
2) after steel billet is come out of the stove, the high-pressure water descaling through pressure >=15MPa；
3) rolling mill practice：Start rolling temperature is controlled at 1150~1180 DEG C, and finishing temperature control is at 1050~1080 DEG C；Roll stagnation pressure
Lower rate >=30%, single pass reduction ratio >=10%；Steel plate rolling speed control is in 2~10m/s；
After rolling starts, each passage continuously changes roll gap distance by controlling the variation of rolling mill hydraulic cylinder oil column height, leads to
Every time iterative calculation is crossed, realizes the consecutive variations of steel plate longitudinal thickness；It is rolled simultaneously according to the adjustment of the actual (real) thickness of steel plate
The roll gap self study coefficient of machine preset model measures steel plate actual (real) thickness by thickness measurement equipment, by actual (real) thickness and reason
Compare by thickness, obtains from roll gap self study coefficient L1；Specific calculating process is as follows：
L=N × (MFH-GMH)
L1=B1×L+(1-B1)×L
Wherein：L--- roll gap self study coefficients；
N--- penalty coefficients；
MFH--- measurement of the steel plate thickness；
GMH--- steel plate theoretic throats；
L1--- the current calculated value of roll gap self study coefficient；
B1--- smoothing factor；
According to the current calculated value L of roll gap self study coefficient1Gap values between rollers Gap is calculated, dynamic adjusts mill roll-gap, realizes wedge shape LP steel
The rolling of plate, Gap computational methods are as follows：
In formula：Gap--- roll gap setup algorithm values；
Fh--- strip exit thickness setup algorithm values；
Gwid.lay1--- width compensation gains；
WCX--- width compensations；
Goil.Lay1--- Oil Film Compensation gains；
M--- milling train constants；
S--- has load roll gap；
S0--- roll gap when roll is demarcated；
F--- oil-film forces；
F0--- oil-film force when calibration；
4) cooling technique：The beginning of cooling temperature is 1000~1050 DEG C, and red temperature is 660~750 DEG C；Cooling velocity be 8~
20℃/s。
2. a kind of milling method of wedge shape LP steel plates according to claim 1, which is characterized in that the penalty coefficient N is used
It is modified in self study mathematical model, the value range of N is：
Wedge-shaped LP steel plates h1For 10~80mm when, N be 0.10~0.12；
Wedge-shaped LP steel plates h1For 81~130mm when, N be 0.15~0.20；
Wedge-shaped LP steel plates h1When more than 130mm, N values are 0.5.
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| CN201710068959.2A CN108393359A (en) | 2017-02-08 | 2017-02-08 | A kind of milling method of wedge shape LP steel plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710068959.2A CN108393359A (en) | 2017-02-08 | 2017-02-08 | A kind of milling method of wedge shape LP steel plates |
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| CN108393359A true CN108393359A (en) | 2018-08-14 |
Family
ID=63093857
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110328232A (en) * | 2019-05-29 | 2019-10-15 | 邯郸钢铁集团有限责任公司 | A method of utilizing process control rolling wedge-shaped steel plate |
Citations (3)
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|---|---|---|---|---|
| CN102397875A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Production method of longitudinal thickness-variable steel plate |
| CN102896156A (en) * | 2012-09-29 | 2013-01-30 | 鞍钢股份有限公司 | Optimization method for hot rolled strip steel roll gap model |
| CN103506404A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Method for controlling roll gap during finish rolling of strip steel |
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2017
- 2017-02-08 CN CN201710068959.2A patent/CN108393359A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102397875A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Production method of longitudinal thickness-variable steel plate |
| CN103506404A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Method for controlling roll gap during finish rolling of strip steel |
| CN102896156A (en) * | 2012-09-29 | 2013-01-30 | 鞍钢股份有限公司 | Optimization method for hot rolled strip steel roll gap model |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110328232A (en) * | 2019-05-29 | 2019-10-15 | 邯郸钢铁集团有限责任公司 | A method of utilizing process control rolling wedge-shaped steel plate |
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Application publication date: 20180814 |