CN103920721A - Method for controlling strip steel head stability during hot rolling - Google Patents
Method for controlling strip steel head stability during hot rolling Download PDFInfo
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- CN103920721A CN103920721A CN201310011242.6A CN201310011242A CN103920721A CN 103920721 A CN103920721 A CN 103920721A CN 201310011242 A CN201310011242 A CN 201310011242A CN 103920721 A CN103920721 A CN 103920721A
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Abstract
The invention discloses a method for controlling strip steel head stability during hot rolling. The method includes the steps that (100) velocity deviation of guide wheels on two sides at an inlet can be measured when a current rack bites steel; (200) time of leveling action of the current rack on a strip steel head is locked; (300) calculated head leveling amount of the current rack is obtained; (400) the obtained calculated head leveling amount is compared with adjusting amplitude limit to determine actual leveling amount; (500) leveling operation is performed on roll gaps of the current rack according to the actual leveling amount. By means of the method for controlling strip steel head stability during hot rolling, deflected strip steel head can be automatically corrected, and thereby, the strip steel head can be stabilized.
Description
Technical field
The present invention relates to utilize finishing mill to carrying out the technology controlling and process in hot rolling with steel, more specifically, is a kind of method of controlling in course of hot rolling with steel head stability.
Background technology
Utilize finishing mill to carry out the technique change process that hot rolling is a complexity with steel plate type, because of current each operation technology limitation of (comprising heating process, descaling process, side bat technique etc.), head definitely straight rolled parts is non-existent.In the operation of rolling, though the identical band steel of rolling kind and specification, in some aspects also will inevitably there is some difference.These differences comprise temperature contrast, the thickness difference objection in head width direction and the head template difference etc. in head width direction.And it is very short to pass through time of finishing mill with steel head, control device and the control time of leaving operating personnel for are comparatively limited, are therefore difficult to the method that finds effective control belt steel rolling part head sideslip and roll brokenly always.
The existing method preventing with steel head sideslip is mainly by completing by manual adjustment after the actual template situation of the visual band steel of operative employee frame.Particularly, operating personnel's range estimation is the shape wave situation in each frame with steel head, this frame rod seam leveling handle of manual adjustments.When finding that band steel threading goes out after a certain frame, there is shape wave phenomenon in active side, and now explanation band steel, toward transmission lateral deviation, regulates on active side roll gap and lifts, and makes to be with steel to move toward active side; Otherwise shape wave phenomenon appears in band steel transmission side as found, now explanation band steel, toward work lateral deviation, now regulates active side roll gap to press down, and makes to be with steel to move toward transmission side, to reach the object of controlling with steel head sideslip.
Shortcoming with the hand operated control method of the head sideslip of steel mainly comprises:
First, rely on operating personnel's naked eyes judgement strip running deviation completely, the initial stage that may occur at sideslip is hardly discovered, and has certain hysteresis quality;
Secondly, due to threading speed, with steel head, pass through the time very short (especially afer bay) of milling train, rely on the reaction time of controlling manually not enough completely;
Finally, because plate shape, temperature and steel grade with steel often change, according to lastblock band steel, carry out head leveling meeting and often cause error in judgement.
To sum up, owing to lacking the effective control device preventing with steel head sideslip, band steel head sideslip cause roll brokenly, limit damage, folding line and limit split phenomenon and often occur.After rolling brokenly, can cause larger damage to working roll used and backing roll simultaneously, and then cause the band steel exhibiting high surface shaggy block defect of follow-up rolling to produce, when simultaneously more serious, can cause causing roll surface to lose flesh on (quick-fried roller) owing to seriously rolling brokenly, this has caused and has had a strong impact on to the normal production of production line with for roller.
Summary of the invention
Object of the present invention, is to solve and in existing course of hot rolling, prevents the above-mentioned deficiency with the means of steel head sideslip, thereby the method with steel head stability is provided in a kind of control course of hot rolling of innovation.
In control course of hot rolling of the present invention with the method for steel head stability, be used for preventing from being with steel utilizing mm finishing mill unit to carry out course of hot rolling head sideslip, wherein, this mm finishing mill unit comprises a plurality of frames, respectively between this frame, be provided with a set of guide plate, and this every cover guide plate is provided with the guide wheel that is positioned at guide plate both sides, when band steel moves in course of hot rolling, this guide wheel contacts with steel edge portion and steel going along with motion and rotating, and the method comprises the following steps:
Step S100, when band steel moves in this mm finishing mill unit one when forebay Fn stings steel, measures the velocity deviation Δ V that deserves forebay Fn entrance two side guide wheels, wherein, should forebay Fn be in other frame outside the first frame in this mm finishing mill unit;
Step S200, locking is deserved forebay Fn to leveling t action time with steel head:
Wherein, S is the distance of the upper frame Fn-1 working roll axle center as forebay Fn to two side guide wheels as forebay Fn, and Vn is the speed while deserving forebay Fn with steel head process;
Step S300, obtains the calculating head leveling amount Δ S that deserves forebay Fn:
ΔS＝ΔV*K
i
Wherein, K
ifor the gain coefficient as forebay Fn, and K
ispan be from-0.5 to-4;
Step S400, to compare when the calculating head leveling amount of forebay Fn with when the adjusting amplitude limit of forebay, determine actual leveling amount, wherein, when deserving the absolute value of the calculating head leveling amount of forebay Fn while surpassing the adjusting amplitude limit that deserves forebay, the adjusting amplitude limit that deserves forebay is defined as to actual leveling amount, otherwise, this calculating head leveling amount is defined as to actual leveling amount;
Step S500, according to this actual leveling amount, within leveling action time of this locking, carries out leveling operation to deserving the roller gap of forebay Fn.
Preferably, described mm finishing mill unit comprises seven frames, wherein, and in described step S400,
When described, when forebay is the second frame and the 3rd frame, the described adjusting amplitude limit when forebay is 300 microns;
When described, when forebay is the 4th frame and the 5th frame, the described adjusting amplitude limit when forebay is 150 microns;
When described, when forebay is the 6th frame and the 7th frame, the described adjusting amplitude limit when forebay is 60 microns.
Preferably, in described step S100, in described frame Fn both sides, be provided for the rotating speed of its two side guide wheel to carry out the sensor of tachometric survey, to measure described velocity deviation.
Preferably, described sensor is PLG counter.
Preferably, in described step S200, described leveling is action time:
When described, when forebay is the second frame, described leveling action time is 3 seconds; When described, when forebay is the 3rd frame, described leveling action time is 2 seconds; When described, when forebay is the 4th frame, described leveling action time is 1.2 seconds; When described, when forebay is the 5th frame, described leveling action time is 0.9 second; When described, when forebay is the 6th frame, described leveling action time is 0.55 second; When described, when forebay is the 7th frame, described leveling action time is 0.45 second.
Preferably, in described step S300, the described gain coefficient K when forebay
ifor:
When described when forebay is the second frame, described gain coefficient K
ifor-3.81; When described when forebay is the 3rd frame, described gain coefficient K
ifor-2.20; When described when forebay is the 4th frame, described gain coefficient K
ifor-1.42; When described when forebay is the 5th frame, described gain coefficient K
ifor-1.05; When described when forebay is the 6th frame, described gain coefficient K
ifor-0.82; When described when forebay is the 7th frame, described gain coefficient K
ifor-0.63.
Utilize in control course of hot rolling of the present invention the method with steel head stability, by carrying out automatic leveling control, milling train to each frame adjusts accordingly, to change with the both sides of steel, extend, make its head operation close to perfect condition, therefore, can automatically to problems such as band steel head sideslips, correct control, thereby reach, make with the stable object of steel head, and can be by the stability class index in hot rolling, such as puncturing, limit damages, limit is split etc., reduces by 50% level, also can reduce operating personnel's manipulation strength simultaneously.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of a part for quiet milling train group;
Fig. 2 is the structural representation of rolling mill screwdown levelling device in a frame;
Fig. 3 is with the schematic flow sheet of the method for steel head stability in control course of hot rolling of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the process step with the method for steel head stability in control course of hot rolling of the present invention is elaborated.
In general, method of the present invention, when being stung to steel, frame detects the speed difference of these frame two side guide wheels, obtain the head leveling amount in this frame, and regulating in leveling action time of amplitude limit and locking, this frame is carried out to leveling operation, thereby reach the object preventing with steel head sideslip.
Therefore, the present invention can be used for preventing from being with steel utilize mm finishing mill unit carry out course of hot rolling in head sideslip.Routinely, mm finishing mill unit can comprise a plurality of frames, is provided with a set of guide plate between each frame, and every cover guide plate is provided with the guide wheel that is positioned at guide plate both sides, when band steel moves in course of hot rolling, guide wheel can contact with steel edge portion, and steel going along with moves and rotates.
More specifically, with reference to Fig. 1, the guide plate 1,3 that shows two adjacent frames 2,4 and be positioned at these frame 2,4 front ends, band steel 5 operates on guide plate 1,3, and guide wheel 6 is arranged at guide plate 1,3 both sides.When the operation of band steel 5, guide wheel 6 can change the way of contact of steel edge portion and guide plate 1,3, from sliding friction, becomes rolling friction, steel edge portion is caused damage avoiding.Therefore, the speed that guide wheel rotates, has reflected the speed of service with steel 5.
With reference to Fig. 2, it is the structural representation of rolling mill screwdown levelling device in existing mm finishing mill unit frame.Levelling device comprises high accuracy displacement sensor (MP-Scale) 1, AGC oil cylinder 2 and pressure-measuring head system 15, also shows a pair of working roll 13 and a pair of backing roll 14 in figure.Routinely, when levelling device receives the leveling amount of being exported by control system, this leveling amount can be applied in the adjuster of AGC oil cylinder, and then milling train is carried out to leveling operation.
Advantage of the present invention, is to utilize above-mentioned existing setting, utilizes guide wheel and levelling device in existing mm finishing mill unit, easily to the operation of rectifying a deviation of band steel head.Particularly, in conjunction with Fig. 3, in control course of hot rolling of the present invention with the schematic flow sheet of the method for steel head stability.The method comprising the steps of S100-S500, wherein, in step S100, when forebay is stung steel, measures the velocity deviation of porch two side guide wheels; In step S200, locking is when forebay is to the leveling action time with steel head; In step S300, obtain the calculating head leveling amount when forebay; In step S400, the calculating head leveling amount of acquisition and adjusting amplitude limit are compared, determine actual leveling amount; In step S500, according to actual leveling amount, current frame roll gap is carried out to leveling operation.Below these process steps are described in more detail.
step S100.
In this step, in course of hot rolling, band steel moves in mm finishing mill unit one when forebay Fn stings steel, measure the velocity deviation Δ V of frame entrance Fn two side guide wheels, in this flow process, the first frame is not carried out to leveling operation, therefore, when forebay Fn refers to other frame except the first frame in this mm finishing mill unit.For example, while comprising seven frames in quiet milling train group, Fn can be in the second frame, the 3rd frame, the 4th frame, the 5th frame, the 6th frame and the 7th frame.
Velocity deviation Δ V can draw by detecting respectively the speed of two side guide wheels.Detection to guide wheel speed, can realize by be provided for the sensor of speed detection in frame both sides.For example, in a preferred embodiment of the present invention, PLG counter can be set, with the speed V to the guide wheel of both sides respectively
ds, V
wsdetect, thereby draw velocity deviation Δ V:
Δ V=V
ds-V
ws; (formula 1)
Easily understand, to the speed of two side guide wheels and velocity deviation, also can realize by other suitable velocity sensor.
step S200.
In this step, after calculating this velocity deviation Δ V, locking is when forebay Fn is to leveling t action time with steel head.Locking leveling action time, till referring to and constantly playing leveling t action time and finish from this locking, can be to carrying out leveling operation when forebay, after exceeding this leveling action time, stop leveling and operate.The object of doing like this, is in order to prevent leveling faulty operation, this be because, due to quiet, rolling in process, also there is the inclined to one side phenomenon of tail while throwing steel in band steel afterbody, if do not lock leveling action time, the inclined to one side phenomenon of tail also can cause guide wheel to rotate, thereby causes the possibility that mistuning is flat.
Because the steel plate thickness by different frames differs greatly, therefore, each frame equates for guaranteeing second flow, there is larger difference in threading speed (speed while passing through this frame with steel head), therefore, the locking time that different frames are stung after steel is not identical yet, according to second flow, equates formula:
V
n* H
n=V
n+1* H
n+1; (formula 2)
Can show that the locking leveling as forebay Fn is action time:
In above-mentioned formula 2, V
n, H
nbe respectively threading speed (speed while passing through this frame with steel head) and rolling thickness as forebay Fn; V
n+1, H
n+1respectively to threading speed and the rolling thickness of working as the next frame of forebay; In formula 3, S is the distance of the upper frame Fn-1 working roll axle center as forebay Fn to two side guide wheels as forebay Fn, V
nspeed while deserving forebay Fn for passing through with steel head.
Of the present invention one preferred embodiment in, for thering is the mm finishing mill unit of seven frames, to being specifically set to the locking time of the second frame to the seven frames (F2-F7): when forebay is the second frame, leveling action time is 3 seconds; When forebay is the 3rd frame, leveling action time is 2 seconds; When forebay is the 4th frame, leveling action time is 1.2 seconds; When forebay is the 5th frame, leveling action time is 0.9 second; When forebay is the 6th frame, leveling action time is 0.55 second; When forebay is the 7th frame, leveling action time is 0.45 second.As shown in the following Table 1:
The locking leveling action time of the different frames of table 1
| Frame | F2 | F3 | F4 | F5 | F6 | F7 |
| Locking time (second) | 3 | 2 | 1.2 | 0.9 | 0.55 | 0.45 |
step S300.
In this step, after calculating velocity deviation, utilize following formula, obtain the calculating head leveling amount as forebay Fn:
Δ S=Δ V*K
i; (formula 4)
In formula 4, K
ifor the gain coefficient as forebay Fn, and K
ispan be from-0.5 to-4.
Preferably, K
ican, according to the difference of frame, choose the gain coefficient that value is different.Of the present invention one preferred embodiment in, for having the mm finishing mill unit of seven frames, the choosing of gain coefficient of the second frame to the seven frames (F2-F7) is specially: when forebay is the second frame, gain coefficient K
ifor-3.81; When forebay is the 3rd frame, gain coefficient K
ifor-2.20; When forebay is the 4th frame, gain coefficient K
ifor-1.42; When forebay is the 5th frame, described gain coefficient K
ifor-1.05; When forebay is the 6th frame, gain coefficient K
ifor-0.82; When forebay is the 7th frame, described gain coefficient K
ifor-0.63.Be setting value as shown in table 2 below:
The gain coefficient setting value of the different frames of table 2
| Frame | F2 | F3 | F4 | F5 | F6 | F7 |
| K i | -3.81 | -2.20 | -1.42 | -1.05 | -0.82 | -0.63 |
step S400.
In this step, to compare when the calculating head leveling amount of forebay Fn with when the adjusting amplitude limit of forebay, determine actual leveling amount, wherein, when deserving the absolute value of the calculating head leveling amount of forebay Fn while surpassing the adjusting amplitude limit that deserves forebay, the adjusting amplitude limit that deserves forebay is defined as to actual leveling amount, otherwise, this calculating head leveling amount is defined as to actual leveling amount.
Due in actual production process, may exist some emergency case to cause leveling to occur abnormal, therefore, for guaranteeing production safety, can predetermined adjusting amplitude limit be set to each frame, that is to say, when determining final leveling amount (being actual leveling amount), should not exceed corresponding adjusting amplitude limit.When exceeding this amplitude limit, the adjusting amplitude limit of getting its correspondence is actual leveling amount.
Of the present invention one preferred embodiment in, when mm finishing mill unit comprises 7 frames, adjusting amplitude limit corresponding to each frame is: when forebay is the second frame and the 3rd frame, corresponding adjusting amplitude limit is 300 microns; When forebay is the 4th frame and the 5th frame, corresponding adjusting amplitude limit is 150 microns; When forebay is the 6th frame and the 7th frame, corresponding adjusting amplitude limit is 60 microns.
Thus, in this step, the final actual leveling amount of determining as forebay Fn.
step S500.
In this step, according to the actual leveling amount as forebay Fn of determining in step S400, within leveling action time of this locking, to deserving the roller gap of forebay Fn, carry out leveling operation.
When control system is determined after the actual leveling amount of forebay, and then using this leveling amount as output quantity, be applied in the adjuster of AGC oil cylinder in this frame, adjuster is according to this output quantity, working roll roll gap in milling train is carried out to leveling operation, and this has been the means that routine is used in the industry.Routinely, due to finishing stand leveling, be to be initial point according to roll center, so leveling operation is mainly the action that makes roll active side lift or depress.
In sum, utilize in control course of hot rolling of the present invention the method with steel head stability, by carrying out automatic leveling control, milling train to each frame adjusts accordingly, to change with the both sides of steel, extend, make its head operation close to perfect condition, therefore, can automatically to problems such as band steel head sideslips, correct control, thereby reach, make with the stable object of steel head, and can be by the stability class index in hot rolling, such as rolling brokenly, damage on limit, limit is split etc., reduce by 50% level, also can reduce operating personnel's manipulation strength simultaneously.
Claims (6)
1. a method of controlling in course of hot rolling with steel head stability, be used for preventing from being with steel utilizing mm finishing mill unit to carry out course of hot rolling head sideslip, wherein, this mm finishing mill unit comprises a plurality of frames, respectively between this frame, is provided with a set of guide plate, and this every cover guide plate is provided with the guide wheel that is positioned at guide plate both sides, when band steel moves in course of hot rolling, this guide wheel contacts with steel edge portion and steel going along with motion and rotating, and it is characterized in that, the method comprises the following steps:
Step S100, when band steel moves in this mm finishing mill unit one when forebay Fn stings steel, measures the velocity deviation Δ V that deserves forebay Fn entrance two side guide wheels, wherein, should forebay Fn be in other frame outside the first frame in this mm finishing mill unit;
Step S200, locking is deserved forebay Fn to leveling t action time with steel head:
Wherein, S is the distance of the upper frame Fn-1 working roll axle center as forebay Fn to two side guide wheels as forebay Fn, and Vn is the speed while deserving forebay Fn with steel head process;
Step S300, obtains the calculating head leveling amount Δ S that deserves forebay Fn:
ΔS＝ΔV*K
i，
Wherein, K
ifor the gain coefficient as forebay Fn, and K
ispan be from-0.5 to-4;
Step S400, to compare when the calculating head leveling amount of forebay Fn with when the adjusting amplitude limit of forebay, determine actual leveling amount, wherein, when deserving the absolute value of the calculating head leveling amount of forebay Fn while surpassing the adjusting amplitude limit that deserves forebay, the adjusting amplitude limit that deserves forebay is defined as to actual leveling amount, otherwise, this calculating head leveling amount is defined as to actual leveling amount;
Step S500, according to this actual leveling amount, within leveling action time of this locking, carries out leveling operation to deserving the roller gap of forebay Fn.
According in control course of hot rolling claimed in claim 1 with the method for steel head stability, it is characterized in that, described mm finishing mill unit comprises seven frames, wherein, in described step S400,
When described, when forebay is the second frame and the 3rd frame, the described adjusting amplitude limit when forebay is 300 microns;
When described, when forebay is the 4th frame and the 5th frame, the described adjusting amplitude limit when forebay is 150 microns;
When described, when forebay is the 6th frame and the 7th frame, the described adjusting amplitude limit when forebay is 60 microns.
In control course of hot rolling according to claim 1 with the method for steel head stability, it is characterized in that, in described step S100, in described frame Fn both sides, be provided for the rotating speed of its two side guide wheel to carry out the sensor of tachometric survey, to measure described velocity deviation.
In control course of hot rolling according to claim 3 with the method for steel head stability, it is characterized in that, described sensor is PLG counter.
5. in the control course of hot rolling of stating according to claim 2, with the method for steel head stability, it is characterized in that, in described step S200, described leveling is action time:
When described, when forebay is the second frame, described leveling action time is 3 seconds; When described, when forebay is the 3rd frame, described leveling action time is 2 seconds; When described, when forebay is the 4th frame, described leveling action time is 1.2 seconds; When described, when forebay is the 5th frame, described leveling action time is 0.9 second; When described, when forebay is the 6th frame, described leveling action time is 0.55 second; When described, when forebay is the 7th frame, described leveling action time is 0.45 second.
In control course of hot rolling according to claim 2 with the method for steel head stability, it is characterized in that, in described step S300, the described gain coefficient K when forebay
ifor:
When described when forebay is the second frame, described gain coefficient K
ifor-3.81; When described when forebay is the 3rd frame, described gain coefficient K
ifor-2.20; When described when forebay is the 4th frame, described gain coefficient K
ifor-1.42; When described when forebay is the 5th frame, described gain coefficient K
ifor-1.05; When described when forebay is the 6th frame, described gain coefficient K
ifor-0.82; When described when forebay is the 7th frame, described gain coefficient K
ifor-0.63.
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| CN104307892A (en) * | 2014-11-06 | 2015-01-28 | 广西柳州银海铝业股份有限公司 | Method for strip head correction in continuous rolling strip threading process |
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| CN110961469A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Method and device for controlling stability of strip steel head |
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| CN110180901A (en) * | 2018-04-20 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | A kind of dry head rolling mill practice of 280~φ of φ, 350 steel billet |
| CN112974533A (en) * | 2019-12-12 | 2021-06-18 | 上海梅山钢铁股份有限公司 | Strip steel head and tail length optimized shearing method based on hot rolling incoming material data |
| CN110961469A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Method and device for controlling stability of strip steel head |
| CN110961469B (en) * | 2019-12-19 | 2021-04-27 | 北京首钢股份有限公司 | Method and device for controlling stability of strip steel head |
| CN111451295A (en) * | 2020-03-17 | 2020-07-28 | 唐山钢铁集团微尔自动化有限公司 | Cascade control method for controlling rolling warpage of billet |
| CN111451295B (en) * | 2020-03-17 | 2021-10-12 | 唐山钢铁集团微尔自动化有限公司 | Cascade control method for controlling rolling warpage of billet |
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