CN103252350B - Leveling method for finishing mill after roller changing - Google Patents
Leveling method for finishing mill after roller changing Download PDFInfo
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- CN103252350B CN103252350B CN201210035671.2A CN201210035671A CN103252350B CN 103252350 B CN103252350 B CN 103252350B CN 201210035671 A CN201210035671 A CN 201210035671A CN 103252350 B CN103252350 B CN 103252350B
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Abstract
The invention discloses a leveling method for a finishing mill after roller changing. The method comprises the following steps: a, recording a rolling force deviation value F' and an oil column deviation value h0' of two sides of a working roller after roller gap zeroing in a previous production planning cycle and an oil column deviation value h2' during stable rolling in the previous production planning cycle; b, imposing rolling forces on the working roller, and stopping pressing operations on oil cylinders when the sum of the rolling forces reaches a first set press tonnage; c, adjusting the rolling force deviation value of two sides of the working roller after step b to be within a static deviation threshold range; d, pressing the oil cylinders on two sides of the working roller simultaneously again, and stopping pressing operations on the oil cylinders when the sum of the rolling forces on two sides reaches a second set press tonnage; and e, calculating an equivalent adjustment value H according to an equivalent adjustment formula and adjusting the oil column deviation according to the equivalent adjustment value. According to the leveling method, accidents of deviation, steel scrapping and the like during rolling can be controlled effectively.
Description
Technical field
The present invention relates to finishing mill operation in the hot rolling to control, more specifically, is the leveling method after a kind of Finish Mill Roll Changing.
Background technology
In hot rolling production process, after mm finishing mill unit completes rolling within each production schedule cycle, all working roll replacing will be carried out.Because the peripheral conditions such as work roll diameter before and after roll change and equipment gap all change, after roll change, need to carry out Levelling operation to finishing mill.Existing Levelling operation generally includes roll gap zeroing and artificial equivalence adjustment two parts.
After roll gap zeroing operation refers to roll change, roll gap clearing is carried out to finishing mill, to eliminate gap, redefine the position of zero roll gap, thus be that the accurate setting of roll gap model and the accurate control of hydraulic AGC (Automatic Gauge Control, automatic thickness controls) control system provide benchmark.As shown in Figure 1, in step sl, the oil cylinder of working roll both sides was adjusted to the oil column deviation in each leisure upper production schedule cycle.In step s 2, the press down system of finishing mill depresses the oil cylinder of working roll both sides (i.e. active side and transmission side) simultaneously, and to apply roll-force to working roll, the roll-force sum when both sides reaches 400 ton hours, stops oil cylinder pressing operation.In step s3, start milling train, and rolling mill speed is adjusted to predetermined acyclic homologically trioial speed, acyclic homologically trioial speed is set as 1/3rd of milling train maximum operational speed usually.In step s 4 which, working roll both sides are depressed again simultaneously, until both sides roll-force sum reaches 1000-1500 ton, thus complete the clear operation to working roll roll gap.
After roll gap zeroing, also need to carry out artificial equivalence adjustment further in step s 5.Roll gap zeroing process mainly determines the zero-bit of roll gap, and this zero-bit is depressed simultaneously by working roll both sides, i.e. active side and transmission side oil cylinder or lifted realization, and therefore this process can not ensure the parallel of roll gap both sides mechanical location.On the other hand, owing to affecting by the asymmetrically distributed of factor such as incoming profile and band steel transverse temperatures, for guaranteeing to shut out the straight of band steel, therefore wish to reach the equivalent parallel having milling train both sides roll gap under the state of carrying.So, smooth in order to ensure open rolling, after roll gap zeroing has operated, operating personnel also need by the observation and analysis to rolling force deviation and oil column deviation in acyclic homologically trioial process, and according to personal experience, equivalence adjustment is carried out to roll gap, make roll gap be in equivalent parallel state, straight with the band steel guaranteeing finally to shut out, accident occurs to prevent sideslip or roll brokenly etc.
But operating personnel are when carrying out equivalence adjustment, and due to work under bad environment, the phenomenon such as often to occur after roll gap calibration both sides rolling force deviation and the fluctuation of oil column deviation is larger, operates so operating personnel cannot carry out equivalence adjustment often exactly.This still cannot be avoided the generation of the accidents such as strip running deviation.
In addition, in the operation of above-mentioned roll gap calibration, due to roll system structure deficient in stability, this may cause acyclic homologically trioial to operate and can not accomplish the end in view.Finishing mill complicated integral structure, contact surface is more, and the uneven wear of contact member, distortion and contact surface foreign matter all can have influence on the state of contact surface.After roll change, roll system structure reconfigures, and ladder backing plate can make corresponding adjustment for adapting to roll diameter change, and these changes will inevitably make the deviation before and after roll change in the vertical direction of working roll both sides change.And adopt above-mentioned roll gap calibration operation, due in new planning cycle, retain oil column deviation last time, therefore after acyclic homologically trioial has operated, due to the existence of above-mentioned factor, the mechanical location of roll gap, in fact not for parastate.
Moreover as mentioned above, how operating personnel, when carrying out equivalence adjustment, rule of thumb carry out.Operating personnel are when adjusting, rolling force deviation after meeting reference acyclic homologically trioial terminates carries out equivalence adjustment, such as, after acyclic homologically trioial terminates, rolling force deviation is bigger than normal sometimes, if operating personnel carry out equivalence adjustment according to the oil column deviation in last planning cycle during stable rolling to roll gap, to realize the leveling of roll, may cause on the contrary and continue to strengthen to rolling force deviation.Therefore, operating personnel to the direction reducing rolling force deviation, can carry out roll gap equivalence adjustment usually.But oil column departure is not sought unity of standard, operating personnel can only regulate according to personal experience.In fact, the rolling force deviation of operating personnel's reference in the process of carrying out equivalence adjustment can not accurately reflect roll gap state.
Particularly, on the one hand, the rolling force deviation that roll gap calibration terminates rear system log (SYSLOG) is instantaneous value, and the fluctuation of this instantaneous value deviation is comparatively large, and therefore accurately can not reflect the truth of rolling force deviation, this can cause interference to the accurate adjustment of operating personnel.
On the other hand, composition graphs 1, the rolling force deviation of system log (SYSLOG) after roll change is the rolling force deviation after step S4 completes.This rolling force deviation is the quiet deviation of generation roll-force and newly-increased dynamic deviation sum after step S2 completes.Quiet deviation refers to the fixing rolling force deviation of the milling train of non-operating state when certain pressure tonnage; Dynamic deviation refers to the rolling force deviation produced in milling train running.Quiet deviation is caused by mechanical dimension's difference substantially, can reflect the dimensional discrepancy in roller system both sides vertical direction, this dimensional discrepancy can be eliminated by machinery adjustment (such as AGC oil cylinder adjustment), and the dynamic deviation origin cause of formation is comparatively complicated, and exist all the time, be difficult to eliminate.Analyzed as can be seen from above, only have quiet deviation can reflect the truth of both sides roll gap dimensional discrepancy, dynamic deviation axially causes primarily of roller system, can not reflect both sides roll gap dimensional discrepancy, and therefore both sums can not accurately reflect roll gap state.So if dynamic and static deviation polarity is identical, finally showing deviation will increase; If dynamic and static deviation polarity is contrary, the deviation finally shown likely reduces, and also likely oppositely increases.For the first situation, operating personnel can think that roll gap both sides dimensional discrepancy is very large, and therefore when equivalence adjustment, it is excessive to adjust, and causes roll gap reversed dip; For the second situation, if rolling force deviation diminishes, operating personnel can think roll gap, and convergence is parallel, therefore do not adjust, and actual roll gap deviation is still larger, if roll-force oppositely increases, the roll gap deviation that operating personnel judge can be completely contrary with actual conditions, and the adjustment at this time done according to rolling force deviation can make actual roll gap deviation increasing on the contrary.
As seen from the above analysis, due to the change of roller system of rolling mill state, and the unreliability of operating personnel's referenced standard when adjusting, result in existing roll gap Levelling operation can not reach perfect condition, and when causing open rolling, sideslip even occurs that the phenomenons such as steel scrap produce.
Summary of the invention
Object of the present invention, the above-mentioned shortcoming and defect existed in roll gap Levelling operation after being to solve present roll change, thus provide the leveling method after a kind of Finish Mill Roll Changing of innovation.
Leveling method after Finish Mill Roll Changing of the present invention, for carrying out leveling to the roll gap after roll change within a production schedule cycle, the method comprises the following steps:
A, records the rolling force deviation value F ' of working roll both sides after roll gap calibration in the production schedule cycle, oil column deviate h
0' and oil column deviate h on this in production schedule cycle during stable rolling
2';
B, the press down system of finishing mill depresses the oil cylinder of working roll both sides simultaneously, to apply roll-force to working roll, when the roll-force sum of both sides reaches the first predetermined pressure tonnage, stops oil cylinder pressing operation;
C, the rolling force deviation value of the working roll both sides after being completed by step b is adjusted within the scope of quiet deviation threshold;
D, the press down system of finishing mill depresses the oil cylinder of working roll both sides again simultaneously, when the roll-force sum of both sides reaches the second predetermined pressure tonnage, stop oil cylinder pressing operation, and the rolling force deviation value F of working roll both sides and oil column deviate h after roll gap calibration in minute book time production planning cycle
0;
E, according to following formula, calculates equivalent adjusted value H, and according to this equivalent adjusted value, adjusts oil column deviation:
Wherein,
for rolling force deviation conversion coefficient.
Preferably, in step b, described first pressure tonnage is between 300-600 ton; In step c, described quiet deviation threshold is 10-50 ton; In steps d, described second pressure tonnage is between 1000-1500 ton; In step e,
scope is between 1000-1500KN/mm.
Preferably, step c comprises:
If the rolling force deviation value of the working roll both sides after step b completes is greater than this quiet deviation threshold scope, then the press down system of finishing mill is carried out one-sided pressure to working roll or is lifted operation, is adjusted to by the rolling force deviation of working roll both sides within the scope of this quiet deviation threshold.
In the acyclic homologically trioial operation of the present invention after roll change, add the quiet bias removing step of roll-force, and, by equivalent adjustment formula, the fluctuation of oil column deviation when oil column deviation when decreasing Levelling operation and follow-up rolling, and the deviation avoided when operating personnel manually adjust and error occur.Thus the accidents such as the sideslip in the operation of rolling, steel scrap can be made to be effectively controlled.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of existing roll gap Levelling operation;
Fig. 2 is the schematic flow sheet of the leveling method after Finish Mill Roll Changing of the present invention;
Fig. 3 utilizes original method to carry out roll gap leveling respectively and utilizes the present invention to carry out the contrast schematic diagram of the leveling precision of roll gap leveling.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the steps flow chart of the leveling method after Finish Mill Roll Changing of the present invention and operation principle are described in detail.
As shown in Figure 2, the leveling method after Finish Mill Roll Changing of the present invention, for carrying out leveling to the roll gap after roll change within a production schedule cycle, comprises step S100-S500.Wherein, in the step s 100, the rolling force deviation value F ' of working roll both sides after roll gap calibration in the production schedule cycle, oil column deviate h is recorded
0' and oil column deviate h on this in production schedule cycle during stable rolling
2'; In step s 200, the press down system of finishing mill depresses the oil cylinder of working roll both sides simultaneously, to apply roll-force to working roll, when the roll-force sum of both sides reaches the first predetermined pressure tonnage, stops oil cylinder pressing operation; In step S300, the rolling force deviation value of the working roll both sides after being completed by step S200 is adjusted within the scope of quiet deviation threshold; In step S400, the press down system of finishing mill depresses the oil cylinder of working roll both sides again simultaneously, when the roll-force sum of both sides reaches the second predetermined pressure tonnage, stop oil cylinder pressing operation, and the rolling force deviation value F of working roll both sides and oil column deviate h after roll gap calibration in minute book time production planning cycle
0; In step S500, according to following equivalent adjustment formula, calculate equivalent adjusted value H, and according to this equivalent adjusted value, oil column deviation adjusted:
Wherein,
for rolling force deviation conversion coefficient.
Below, in conjunction with flow chart, implement to be described in more detail to each step.
step S100.
In this step, the parameters in the production schedule cycle is recorded in.Within a production schedule cycle, all need to carry out roll change and roll gap Levelling operation.The parameter recorded comprises rolling force deviation value F ', the oil column deviate h of working roll both sides after roll gap calibration in the production schedule cycle
0' and oil column deviate h on this in production schedule cycle during stable rolling
2'.
The rolling force deviation of working roll both sides, the rolling force sensor by being arranged at working roll both sides respectively detects and draws; Oil column deviate refers to that working roll both sides drive the oil column value deviation of oil cylinder, and it records by the position sensor be arranged on oil cylinder.
In the invention, this production schedule cycle is at least second production schedule cycle, namely the present invention be applicable to first time roll change beyond follow-up roll change time roll gap leveling.First time roll change when carrying out roll gap leveling, can utilize step S1-S4 as above to carry out acyclic homologically trioial, and rolling force deviation value F ', the oil column deviate h of working roll both sides after obtaining acyclic homologically trioial
0', then utilize step S5 to complete final equivalent leveling, and oil column deviate h when recording stable rolling
2', as mentioned above, utilize existing acyclic homologically trioial and leveling method, can not guarantee to reach the acyclic homologically trioial of roll gap and equivalent levelling effect, i.e. rolling force deviation value F ', oil column deviate h
0' and stable rolling time oil column deviate h
2' still there is certain error with perfect condition, but along with utilizing the present invention to carry out roll gap leveling in subsequent cycle, these errors will be reduced to minimum.
Certainly, when first time roll change, namely within first production schedule cycle, carry out leveling to roll gap, the mode by conventional pressure copper rod leveling obtains, to carry out leveling more accurately.Particularly, first, prior art step S1-S4 as above can be utilized, acyclic homologically trioial operation is carried out to roll gap, then, two copper rods are arranged in the roll gap of working roll both sides respectively, and apply certain roll-force, when the amplitude of deformation of two copper rods is identical, be then considered as the roll gap leveling state in first production schedule cycle.Thus, by measuring rolling force deviation and oil column deviation, rolling force deviation value F ' and the oil column deviate h of working roll both sides after roll gap leveling in first production schedule cycle can be drawn
0'.
Preferably, oil column deviate h during stable rolling
2', be generally the oil column deviation that the 1st piece to the 5th piece strip steel head in the production schedule cycle enters both sides after working roll, because in the ordinary course of things, after smooth rolling 1-5 block band steel, then can by the equivalent roll gap regulation in the last production schedule cycle to optimum state.
step S200.
In this step, the press down system of finishing mill depresses the oil cylinder of working roll both sides simultaneously, to apply roll-force to working roll, when the roll-force sum of both sides reaches the first predetermined pressure tonnage, stops oil cylinder pressing operation.This step is basic identical with above-mentioned steps S2, before press down system pressure, keeps the oil column deviation of last planning cycle afterbody, and when finishing mill does not rotate, carries out depression.This first pressure tonnage, between 300-600 ton, is preferably 400 tons.
After this step completes, record the rolling force deviation of now working roll both sides, this rolling force deviation is the quiet deviation of roll-force.The acquisition of the quiet deviation of roll-force, can after this step completes, and to measure in certain hour the average roll-force of (such as 3-8 second) working roll both sides and asks difference and obtain.
step S300.
In this step, the rolling force deviation value of the working roll both sides after being completed by step S200 is adjusted within the scope of quiet deviation threshold.Quiet deviation threshold can be preferably set to 10-50 ton.
The rolling force deviation value of the working roll both sides after step S200 completes is quiet deviate, and as mentioned above, after quiet deviation roll change, working roll system both sides dimensional discrepancy is in vertical direction formed.Compared to existing acyclic homologically trioial operation (step S1-S4 as above), the present invention after step s 200 is finished, adds the step adjusted quiet deviation, the elimination of quiet deviate, both sides roll gap can be made as far as possible close to parastate, thus realize predetermined acyclic homologically trioial state.
More specifically, in this step, first, the rolling force deviation value of the working roll both sides after determining step S200 completes, i.e. quiet deviate, whether within the scope of quiet deviation threshold, namely whether the absolute value of quiet deviate is not more than quiet deviation threshold.If quiet deviation is within the scope of this quiet deviation threshold, namely the absolute value of quiet deviate is less than or equal to quiet deviation threshold, then do not adjust; If be greater than quiet deviation threshold scope, namely the absolute value of quiet deviate is greater than quiet deviation threshold, then by the press down system of finishing mill one-sided pressure carried out to working roll or lift operation, thus the rolling force deviation of working roll both sides is adjusted within the scope of this quiet deviation threshold.The enforcement of this step, overcomes in prior art and fails the defect of the quiet deviation adjusting of the power that is rolled.
step S400.
In this step, the press down system of finishing mill depresses the oil cylinder of working roll both sides again simultaneously, when the roll-force sum of both sides reaches the second predetermined pressure tonnage, stop oil cylinder pressing operation, and the rolling force deviation value F of working roll both sides and oil column deviate h after roll gap calibration in minute book time production planning cycle
0.This step and above-mentioned steps S3, S4 similar.When this step is implemented, must be the same with above-mentioned steps S3, finishing mill is opened, and makes its speed be adjusted to predetermined acyclic homologically trioial speed, and then perform pressing operation, until the roll-force sum of both sides reaches the second pressure tonnage.The scope of this second pressure tonnage is 1000-1500 ton.
By step S200-S400, complete and the acyclic homologically trioial of roll gap is operated, after acyclic homologically trioial has operated, record current rolling force deviation and oil column deviation, be i.e. the rolling force deviation value F of working roll both sides and oil column deviate h after roll gap calibration in this production schedule cycle
0, for the calculating of following steps S500, and for the automatic leveling parameter in roll change next time, i.e. next production schedule cycle.
step S500.
After roll gap calibration completes, in this step, last equivalence adjustment is carried out, finally to reach the object of roll gap leveling.
Equivalence adjusted value H, can calculate according to following equivalent adjustment formula, and according to this equivalent adjusted value, adjusts oil column deviation:
Wherein,
for rolling force deviation conversion coefficient.Preferably,
scope be between 1000-1500KN/mm.Easy understand, the unit of each rolling force deviation value is KN, and the unit of each oil column deviate is mm.
In above formula:
(formula 2) is in order to the rolling force deviation F after making this acyclic homologically trioial is close to the adjustment done of rolling force deviation F ' of acyclic homologically trioial last time, the i.e. pressure adjustment amount of active side oil cylinder, when F is less than F ', pressure adjustment amount be on the occasion of, active side oil cylinder performs pressing operation, when F is greater than F ', pressure adjustment amount is negative value, and active side oil cylinder performs lifting operation.Experiment shows, the oil column adjustment amount of 1mm, and corresponding rolling force deviation change is about 1000KN, considers and avoids oil column departure in leveling process to adjust excessive, therefore,
range set be between 1000-1500KN/mm.Formula 2
main Function, be that the equipment state of the equipment state of this acyclic homologically trioial and leveling process and a front acyclic homologically trioial and leveling process is consistent.
Oil column deviation this time after adjustment becomes:
Actual roll gap after adjustment is close to the roll gap after last time acyclic homologically trioial.Then further consider the difference h ' of stable oil column deviation when carrying out being with steel to roll value and the oil column deviation in the last production schedule cycle after acyclic homologically trioial in the last production schedule cycle then,
2-h '
0(formula 4), and formula 4 is added with formula 3, finally draw the equivalent adjustment formula of formula 1.Formula 4 (h '
2-h '
0) mainly consider the impact of open rolling material because the kind of the hot rolling material of each roll change open rolling and specification are all relatively, thus leveling state when this formula can be utilized to find true rolling and acyclic homologically trioial complete after the relative different of leveling state.
After equivalent adjusted value H calculates, the oil column adjustment that instruction performs working roll two side cylinder can be sent, by final oil column deviation adjusting to the equivalent adjusted value H calculated to finishing mill control system.
Compared to prior art, in the acyclic homologically trioial operation of the present invention after roll change, add the quiet bias removing step of roll-force, i.e. step S300, further, in step S500, by equivalent adjustment formula, the fluctuation of oil column deviation when oil column deviation when decreasing Levelling operation and follow-up rolling, and the deviation avoided when operating personnel manually adjust and error occur.
embodiment
In this embodiment, citing is introduced after utilizing step S100-S400 to carry out roll gap zeroing operation emphatically, and then the equivalence adjustment operation utilizing step S500 to carry out.
Particularly, in this embodiment, above-mentioned each parameter is respectively: F=200KN, h
0=0.6mm, F '=300KN, h '
0=0.3mm, h '
2=0.5mm.
Make the rolling force deviation 200KN of this acyclic homologically trioial close to the rolling force deviation 300KN of acyclic homologically trioial last time, need press down active side, AGC oil cylinder volume under pressure is:
-(F-F′)/1500＝-(200-300)/1500＝0.07mm，
Now, rolling force deviation conversion coefficient
get 1500.
After adjustment, oil column deviation becomes:
h
0-(F-F′)/1500＝0.6+0.07＝0.67mm，
Actual roll gap after adjustment is close to acyclic homologically trioial roll gap last time.And then the difference of oil column deviation when considering to stablize threading last time after (second piece band steel after) oil column deviation and last time acyclic homologically trioial:
h′
2-h′＝0.5-0.3＝0.2mm，
Last according to formula 1, obtain this time equivalent roll gap leveling value H:
h
0-(F-F′)/1500+(h′
2-h′)＝0.67+0.2＝0.87mm。
As shown in Figure 3, be that in mm finishing mill unit, a finishing mill utilizes original method to carry out roll gap leveling respectively and utilizes the present invention to carry out the contrast schematic diagram of the leveling precision of roll gap leveling.The difference of oil column deviation when second block of band steel enters this finishing mill after this leveling precision refers to open rolling and adjusted value equivalent during leveling.Utilize prior art and the present invention is each carries out 70 roll change open rollings continuously, and indicate with sequential.As seen from the figure, former leveling mode leveling precision fluctuation is comparatively large, and after open rolling, the difference of second piece of oil column deviation when entering finishing mill and equivalent adjusted value often exceeds ± the effective range of 0.20mm, and levelling effect is undesirable, control system needs to adjust in time according to plate shape, to prevent strip steel head sideslip; Adopt the leveling method of the present invention after improving, after finishing mill open rolling, the difference of oil column deviation when entering of second block of band steel and equivalent adjusted value all controls between ± 0.20mm, this shows leveling method after roll change of the present invention, higher roll gap equivalence leveling precision can be obtained, therefore after open rolling without the need to carrying out too large adjustment, open rolling good stability.
In sum, through the optimization that the leveling method of improvement of the present invention is done, the open rolling stability of mm finishing mill unit is significantly improved, and after open rolling, sideslip steel scrap phenomenon obtains effective control.
Claims (3)
1. the leveling method after Finish Mill Roll Changing, for carrying out leveling to the roll gap after roll change within a production schedule cycle, it is characterized in that, the method comprises the following steps:
A, records the rolling force deviation value F ' of working roll both sides after roll gap calibration in the production schedule cycle, oil column deviate h
0' and oil column deviate h on this in production schedule cycle during stable rolling
2';
B, the press down system of finishing mill depresses the oil cylinder of working roll both sides simultaneously, to apply roll-force to working roll, when the roll-force sum of both sides reaches the first predetermined pressure tonnage, stops oil cylinder pressing operation;
C, the rolling force deviation value of the working roll both sides after being completed by step b is adjusted within the scope of quiet deviation threshold;
D, the press down system of finishing mill depresses the oil cylinder of working roll both sides again simultaneously, when the roll-force sum of both sides reaches the second predetermined pressure tonnage, stop oil cylinder pressing operation, and the rolling force deviation value F of working roll both sides and oil column deviate h after roll gap calibration in minute book time production planning cycle
0;
E, according to following formula, calculates equivalent adjusted value H, and according to this equivalent adjusted value, adjusts oil column deviation, by oil column deviation adjusting to the described equivalent adjusted value H calculated:
Wherein,
for rolling force deviation conversion coefficient.
2. the leveling method after Finish Mill Roll Changing according to claim 1, is characterized in that, in step b, described first pressure tonnage is between 300-600 ton; In step c, described quiet deviation threshold is between 10-50 ton; In steps d, described second pressure tonnage is between 1000-1500 ton; In step e, described in
between 1000-1500KN/mm.
3. the leveling method after Finish Mill Roll Changing according to claim 1 and 2, it is characterized in that, step c comprises:
If the rolling force deviation value of the working roll both sides after step b completes is greater than this quiet deviation threshold scope, then the press down system of finishing mill is carried out one-sided pressure to working roll or is lifted operation, is adjusted to by the rolling force deviation of working roll both sides within the scope of this quiet deviation threshold.
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| CN106269909B (en) * | 2015-05-29 | 2018-10-02 | 宝山钢铁股份有限公司 | A kind of continuous hot-rolling mill dynamic deviation control method |
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| 宝钢1580热轧精轧机辊缝零调研究;周率等;《宝钢技术》;20060331(第3期);第35-38页 * |
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| CN103252350A (en) | 2013-08-21 |
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