CN103028606A - Method for protecting rolling rollers after steel clamping of finishing rolling mill group of hot rolling plant - Google Patents
Method for protecting rolling rollers after steel clamping of finishing rolling mill group of hot rolling plant Download PDFInfo
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- CN103028606A CN103028606A CN2012105457565A CN201210545756A CN103028606A CN 103028606 A CN103028606 A CN 103028606A CN 2012105457565 A CN2012105457565 A CN 2012105457565A CN 201210545756 A CN201210545756 A CN 201210545756A CN 103028606 A CN103028606 A CN 103028606A
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Abstract
The invention discloses a method for protecting rolling rollers after steel clamping of a finishing rolling mill group of a hot rolling plant. The method comprises the following steps that when the condition that some rolling mills generate quick stop signals is determined, all rolling mills of finishing mills are triggered to generate quick stop signals, then, upper rolling rollers of all rolling mills are fast lifted, meanwhile, rolling roller cooling water of all rolling mills is closed; band steel leaves away from the rolling mills, then, the upper rolling rollers of all rolling mills fast return to the positions before the fast lifting, and at the moment, the rolling roller cooling water is not opened; and rolling rollers of all rolling mills rotate at the crawl speed, the cooling water is slowly opened after a period of time for cooling the rolling rollers, and then, the normal rolling is carried out. According to the method disclosed by the invention, the difficult problem of rolling roller surface scalding caused by roll line high-temperature band steel after the roll line steel clamping is solved, so the roll consumption of the rolling rollers for hot rolling work can be reduced, and higher adaptability and popularization are realized.
Description
Technical field
The invention belongs to technical field of steel rolling, specifically, the present invention relates to a kind of method of after the mm finishing mill unit steel-fastening of hot rolling mill, protecting roll.
Background technology
Hot rolling mill is not optimized and is operated the reasons such as not meticulous owing to equipment fluctuation of service, control logic imperfection, technology controlling and process in process of production, often occurs the steel-fastening phenomenon in the operation of rolling.After the steel-fastening, the working roll roll surface of finishing mill also is in the steel state of stinging with the band steel, and high temperate zone steel will directly be scalded roll surface.Roller surface behind the lower machine is scalded serious, cracks, thereby has strengthened the roller consumption, has shortened the service life of roll.
Fig. 1 shows in the prior art the at present photo of the roller surface of the finishing mill behind the machine of steel-fastening occurs in the operation of rolling, wherein, (b) is the photo after the part of (a) is exaggerated.By (a) among Fig. 1 and (b), can be clear that roller surface is scalded serious, and a large amount of significantly fire checks are arranged.
In addition, the roller of hot rolling mill roll consumption is the important indicator of hot rolling mill production cost, and each hot rolling enterprise all comes Roll consumption reduction studying energetically various ways, thereby saves production cost.Yet, in existing hot rolling is produced, not yet find the effective method of after steel-fastening, protecting roll.
Summary of the invention
To scald the problem of roll surface when rolling in the prior art in order solving after the steel-fastening, to the invention provides the method for protection roll after a kind of mm finishing mill unit steel-fastening of hot rolling mill.
The invention provides the method for protection roll after a kind of mm finishing mill unit steel-fastening of hot rolling mill, described method comprises the steps: to produce when stopping signal soon when defining milling train, all milling trains that trigger finishing mill produce and stop soon signal, the topping roll of all milling trains is lifted fast, close simultaneously the roll cooling water of all milling trains; Make machine under the band steel, then make the topping roll of all milling trains get back to fast position before lifting fast, not open rolling this moment roller cooling water; The roll of all milling trains is rotated with creep speed, slowly open after a period of time the water quench roll, then carry out normally rolling.
According to the present invention, mm finishing mill unit can comprise n rolling mill F1 to Fn, n is not less than 4 natural number, wherein, produce all milling trains that trigger finishing mill when stopping signal soon and produce the step of stopping soon signal and comprise when defining milling train: when determining that milling train F1 to Fm(m is natural number and 1≤m≤3) in arbitrary milling train have when stopping signal soon, trigger the whole generations of milling train F1 to Fm and stop soon signal; Arbitrary milling train in determining milling train Fm+1 to Fn has when stopping signal soon, triggers all milling train F1 to Fn generations and stops soon signal.
According to the present invention, arbitrary milling train in determining milling train Fm+1 to Fn has and triggers all milling train F1 to Fn when stopping signal soon and produce the step of stopping soon signal and comprise: the milling train Fi in determining milling train Fm+1 to Fn has when stopping signal soon, triggers milling train F1 to Fi and produces and stop soon signal; Successively determine continuously whether the downstream milling train Fi+1 to Fn-1 that generation stops the milling train Fi of signal soon has steel, if determining milling train Fp(p among the milling train Fi+1 to Fn-1 is that natural number and i+1≤p≤n-1) do not have steel, the topping roll of milling train F1 to Fp-1 is lifted fast, if milling train Fp has steel, then delayed time 2 seconds, and determined continuously successively more whether the downstream milling train of Fp had steel; Determine whether last rolling mill Fn has steel, if milling train Fn does not have steel, the topping roll of milling train F1 to Fn-1 is lifted fast, if milling train Fn does not have steel, then milling train F1 to Fn stops operating, and the topping roll of milling train F1 to Fn-1 is lifted fast; Determine whether coiling machine has tension force, if coiling machine does not have tension force, the topping roll of milling train Fn is lifted fast, if coiling machine has tension force, then stop fast the rotation of coiling machine, and the topping roll of milling train Fn is lifted fast.
According to the present invention, determine that milling train produces the step of stopping soon signal and comprises: when in the frame of determining milling train the roll stall of steel and this milling train being arranged, determine that this milling train generation stops signal soon.
According to the present invention, the stinging the steel signal and determine in the frame of milling train whether steel is arranged of the roll-force by milling train or milling train.
According to the present invention, the step that the topping roll of all milling trains is lifted fast comprises: make AGC hydraulic cylinder fast retractile, so that topping roll lifts 20 ~ 50mm fast.
According to the present invention, described a period of time is 2 ~ 5 minutes, and the step of slowly opening cooling water comprises that per minute increases progressively to set 10% of flow, until reach 100% setting flow.
According to the present invention, n=7, m=3.
Therefore, after the method according to this invention has solved the rolling line steel-fastening, the difficult problem that scald on steel breaker roll surface in high temperate zone, the roller that can reduce the hot rolling work roll consumes, and has stronger adaptability and generalization, and development prospect is good.
Description of drawings
By the detailed description of carrying out below in conjunction with accompanying drawing, above-mentioned and other side of the present invention, feature and other advantage will become easier to understand, in the accompanying drawings:
Fig. 1 shows in the prior art the at present photo of the roller surface of the finishing mill behind the machine of steel-fastening occurs in the operation of rolling, wherein, (b) is the photo after a part of roller surface in (a) is exaggerated;
Fig. 2 is the flow chart according to the method for protection roll after the downstream milling train steel-fastening of the mm finishing mill unit at hot rolling mill of the present invention; And
Fig. 3 shows in the operation of rolling photo that the finishing mill roller surface that method of the present invention obtains occurs to adopt after the steel-fastening, wherein, (b) is the photo after a part of roller surface in (a) is exaggerated.
The specific embodiment
In present hot rolling is produced, sting for a long time the steel state for roll after the steel-fastening under the abnormal conditions, cause roll to be burned, the present inventor has carried out the reason that its generation is analyzed in a large amount of technical research.To this, the application provides a kind of method of protecting roll after the mm finishing mill unit steel-fastening of hot rolling mill, specifically; after steel-fastening, lift on the top working roll of current milling train is automatic, make top working roll as far as possible away from the band steel; close simultaneously the roll cooling of this milling train, the loss of avoiding the chilling breaker roll to cause.
Describe below with reference to accompanying drawings the method for after the mm finishing mill unit steel-fastening of hot rolling mill, protecting roll according to of the present invention in detail.
Understand in order to be easy to describe and be convenient to, in the present invention, mm finishing mill unit comprise n frame finishing mill F1, F2 ..., Fn(n is not less than 4 natural number), the finishing mill of supposing to occur steel-fastening is that Fi(i is the natural number that is not more than n).According to one embodiment of present invention, n can be 7, that is to say, mm finishing mill unit comprises 7 finishing mills; Yet, the invention is not restricted to this.In this manual, specialize such as nothing, symbol i, the m, n, the p etc. that then use in this specification are natural number.
According to the method for after the mm finishing mill unit steel-fastening of hot rolling mill, protecting roll of the present invention, at first, determined whether that the milling train generation stops signal soon, if having, a certain milling train stops soon signal, then all milling trains of mm finishing mill unit are taked operation immediately, with the protection roll.According to the present invention, when the roll stall of steel and this milling train is arranged in the frame of milling train, steel-fastening has occured at this milling train in explanation, at this moment, this milling train can produce and stop soon signal, wherein, can judge in the frame of this milling train whether steel is arranged by the roll-force of milling train, perhaps, can stinging the steel signal and judge whether steel is arranged in the frame of this milling train by milling train.It will be understood by those skilled in the art that when the roll-force of milling train to become suddenly large or exist when stinging the steel signal that illustrating in the frame of milling train has steel; On the contrary, diminish or be zero or when not stinging the output of steel signal, illustrating does not have steel in the milling train when the roll-force of milling train.Here, there is steel to refer to that milling train stung steel but do not throw the state of steel in the frame of milling train.
According to the present invention, produced when stopping signal soon when a certain milling train generation steel-fastening, need to trigger and automatically lift soon function.For mm finishing mill unit, if upstream milling train (F1-Fm, wherein, m≤3) the arbitrary rolling mill in has produced and has stopped soon signal, then trigger all upstream milling train F1-Fm generations and stop soon signal (at this moment, because downstream milling train F (m+1) not yet works to Fn, stop soon signal so need not the downstream milling train produced); If the downstream milling train (F (m+1) is to Fn, wherein, arbitrary milling train Fi(m+1≤i among m≤3 and the m≤n)≤n) has produced and has stopped soon signal, then triggers other milling train by method shown in Figure 2 and produces and stop soon signal (back will be described in detail it).Here, triggering milling train produces and stops soon signal and refer to trigger the signal that milling train is stopped operating immediately.
In the present invention, term " stop soon " to refer to trigger roll (namely driving motor) fast (immediately) signal of stopping operating or people for providing the signal that (button triggering) roll stops operating." stopping soon " is a kind of signal that is different from " suddenly stopping ", the difference of the two is: " suddenly stopping " signal will trigger all relevant device power down (outage), want restart facility to send step by step electricity, re-start the initial work such as equipment calibration, can make equipment investment production after everything is ready; " stop soon " signal and only send stall instruction (do not have a power failure, therefore do not exist and again send electricity) to driving motor, no longer need to do again the initial work such as demarcation, can resume production fast.In addition, in the present invention, the stopping soon of milling train moved and stopping that with the milling train of common meaning certain difference is arranged in the time duration: stop soon to refer to that driving motor is directly reduced to by operating rate on the certain microcosmic of 0(has the moment time-delay because of the driving-chain effect of inertia), to be reduced to gradually 0 by operating rate and stop action, to experience deceleration time much longer.
According to one embodiment of present invention, produced when stopping signal soon when a certain milling train generation steel-fastening, can produce other milling train according to the carrying out stage of the operation of rolling and stop soon signal.Specifically, do not enter the normal finish rolling stage if just begun rolling, that is, stop soon signal if a certain rolling mill only in upstream milling train (F1-Fm, wherein, m≤3) produces, then only need stop the rolling of upstream milling train this moment and get final product.On the other hand, if when carrying out normal finish rolling, then according to the work that whether enters the stage of batching with steel and stop other milling train.Specifically, if the band steel has just entered normally rolling (referring to finish rolling herein) and do not entered the stage of batching, then make generation stop soon the milling train of signal and carried out rolling milling train to produce and stop soon signal; And if the band steel has entered the stage of batching, then at first produce at coiling machine and stop soon signal and trigger coiling machine to stop operating, and then trigger the Fn-F1 milling train and produce the top roll that stops soon signal and trigger the Fn-F1 milling train and lift fast.In this case, preferentially stop soon the former of coiling machine because: if mm finishing mill unit is stopped soon first and lifted top roll, will make coiling machine drag the band steel and continue to move ahead, cause that the band steel draws bad equipment in the mm finishing mill unit.
Method according to protection roll after the mm finishing mill unit steel-fastening of hot rolling mill of the present invention; after the milling train generation stops signal soon; all the quick closedown roll cooling water makes AGC(Automatic PositionControl simultaneously) the hydraulic cylinder fast retractile, so that roll lifts 20 ~ 50mm fast.
According to the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill of the present invention, after lifting roll, make machine under the band steel, fast the site clearing.After handling steel-fastening, carry out the reset function after lifting soon.Specifically, after handling steel-fastening, roll is got back to position before lifting soon fast, to save steel scrap processing time and recovery time; This moment can not open rolling roller cooling water, this is because after steel-fastening occurs, before top working roll does not lift, there is close contact in working roll with the band steel, and working roll can absorb a large amount of heat energy at short notice, causes the work roll surface that contacts with the strip to produce localized heat and expands, if open suddenly cooling water this moment, can cause this expansion area to be shunk rapidly, thereby the surperficial contraction crack of generation is arranged, be unfavorable for the prolongation of roll working life.Then, the roll of all milling trains is rotated with creep speed, slowly open again cooling water (per minute increases progressively to set 10% of flow, sets flow until reach 100%) after 2 ~ 5 minutes.According to the present invention, lift soon the reset function key by arranging, so that roll can be got back to the position before lifting soon fast; The roll cooling water reset key is set simultaneously, so that roll rotates with creep speed.
The downstream milling train that the below is described in detail in mm finishing mill unit with reference to Fig. 2 produces the method for protection roll after the steel-fastening.Fig. 2 is the flow chart according to the method for protection roll after the downstream milling train steel-fastening of the mm finishing mill unit at hot rolling mill of the present invention.
With reference to Fig. 2, method according to protection roll after the downstream milling train steel-fastening of the mm finishing mill unit at hot rolling mill of the present invention comprises the steps: that (F (m+1) is to Fn when determining the downstream milling train, wherein, a certain milling train Fi(m+1≤i among m≤3 and the m≤n)≤n) have when stopping soon signal (step S1), trigger the milling train Fi milling train that is being rolled before (namely, milling train F1 to F (i-1)) and current milling train Fi produce and to stop soon signal (step S2), thereby no longer make steel band enter mm finishing mill unit, to avoid the damage to other milling train, this is because the band steel of upstream mill milling is thicker, milling train is easily broken, and is larger to the damage of milling train; Then, at step S3, whether next milling train F (i+1) that the milling train Fi of steel-fastening determine to occur has steel, if milling train F (i+1) does not have steel, and execution in step S4 then, the topping roll of milling train F1 to Fi is lifted soon, on the contrary, if next milling train F (i+1) of milling train Fi has steel, execution in step S5 then, delayed time 2 seconds, and namely in these 2 seconds, do not carry out any operation; Then, carry out to step S3 to the similar operation of the operation of step S5, specifically, at step S6, whether the milling train F (i+2) of the back of the milling train Fi of definite generation steel-fastening has steel, if determine that milling train F (i+2) does not have steel, then execution in step S7 lifts the topping roll of milling train F1 to F (i+1) soon, on the contrary, if the milling train F (i+2) of the back of the milling train Fi of generation steel-fastening has steel, then execution in step S8 delayed time 2 seconds; Then, carry out to step S3 to step S5 or step S6 to the similar operation of the operation of step S8, until determine last rolling mill Fn whether steel (step S9) is arranged, if milling train Fn does not have steel, execution in step S10 then, the topping roll of milling train F1 to F (n-1) is lifted soon, on the contrary, if milling train Fn has steel, execution in step S11 then, all milling train F1 to Fn are stopped fast, and the topping roll of milling train F1 to F (n-1) is lifted soon; Then, determine whether coiling machine has tension force (step S12), if there is tension force in coiling machine, the topping roll of milling train Fn is lifted soon (step S13), on the contrary, if there is not tension force in coiling machine, then make coiling machine stop soon (step S14), the topping roll of milling train Fn is lifted soon.
Fig. 3 shows in the operation of rolling photo that the finishing mill roller surface that method of the present invention obtains occurs to adopt after the steel-fastening, wherein, (b) is the photo after a part of roller surface in (a) is exaggerated.
Fig. 1 and Fig. 3 contrast can be found out; in the prior art; after mm finishing mill unit generation steel-fastening; as shown in Figure 2; roll surface has obvious fire check, and protects after the mm finishing mill unit steel-fastening of adopting hot rolling mill of the present invention after the method for roll, and the roll fire check after the steel-fastening is not obvious; as shown in Figure 3, almost do not have.
Therefore, the method according to this invention, solved the rolling line steel-fastening after, the difficult problem that scald on high temperate zone steel breaker roll surface has reduced hot rolling work roller consumption, and stronger adaptability and generalization are arranged, development prospect is good.
Although specifically illustrate and described the present invention with reference to exemplary embodiment of the present invention, but it should be understood by one skilled in the art that, in the situation that does not break away from the spirit and scope of the present invention that limited by claim and equivalent thereof, can make change on various forms and the details at this.
Claims (8)
1. the method for protection roll after the mm finishing mill unit steel-fastening of a hot rolling mill is characterized in that described method comprises the steps:
Produce when stopping signal soon when defining milling train, all milling trains that trigger finishing mill produce and stop soon signal, and the topping roll of all milling trains is lifted fast, close simultaneously the roll cooling water of all milling trains;
Make machine under the band steel, then make the topping roll of all milling trains get back to fast position before lifting fast, not open rolling this moment roller cooling water;
The roll of all milling trains is rotated with creep speed, slowly open after a period of time the water quench roll, then carry out normally rolling.
2. the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 1 is characterized in that mm finishing mill unit comprises n rolling mill F1 to Fn, and n is not less than 4 natural number,
Wherein, produce all milling trains that trigger finishing mill when stopping signal soon and produce the step of stopping soon signal and comprise when defining milling train:
Arbitrary milling train in determining milling train F1 to Fm has when stopping signal soon, triggers the whole generations of milling train F1 to Fm and stops soon signal, and wherein, m is natural number and 1≤m≤3;
Arbitrary milling train in determining milling train Fm+1 to Fn has when stopping signal soon, triggers all milling train F1 to Fn generations and stops soon signal.
3. the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 2 is characterized in that, the arbitrary milling train in determining milling train Fm+1 to Fn has and triggers all milling train F1 to Fn when stopping signal soon and produce the step of stopping soon signal and comprise:
Milling train Fi in determining milling train Fm+1 to Fn has when stopping signal soon, triggers milling train F1 to Fi generation and stops soon signal;
Successively determine continuously whether the downstream milling train Fi+1 to Fn-1 that generation stops the milling train Fi of signal soon has steel, there is not steel if determine the milling train Fp among the milling train Fi+1 to Fn-1, the topping roll of milling train F1 to Fp-1 is lifted fast, if milling train Fp has steel, then delayed time 2 seconds, whether the downstream milling train of successively determining continuously again Fp has steel, and wherein, p is natural number and i+1≤p≤n-1;
Determine whether last rolling mill Fn has steel, if milling train Fn does not have steel, the topping roll of milling train F1 to Fn-1 is lifted fast, if milling train Fn does not have steel, then milling train F1 to Fn stops operating, and the topping roll of milling train F1 to Fn-1 is lifted fast;
Determine whether coiling machine has tension force, if coiling machine does not have tension force, the topping roll of milling train Fn is lifted fast, if coiling machine has tension force, then stop fast the rotation of coiling machine, and the topping roll of milling train Fn is lifted fast.
4. protect the method for roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 1; it is characterized in that; determine that milling train produces the step of stopping soon signal and comprises: when in the frame of determining milling train the roll stall of steel and this milling train being arranged, determine that this milling train generation stops signal soon.
5. the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 4 is characterized in that, the stinging the steel signal and determine in the frame of milling train whether steel is arranged of the roll-force by milling train or milling train.
6. the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 1 is characterized in that the step that the topping roll of all milling trains is lifted fast comprises: make AGC hydraulic cylinder fast retractile, so that topping roll lifts 20 ~ 50mm fast.
7. protect the method for roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 1; it is characterized in that; described a period of time is 2 ~ 5 minutes, and the step of slowly opening cooling water comprises that per minute increases progressively to set 10% of flow, until reach 100% setting flow.
8. the method for protection roll after the mm finishing mill unit steel-fastening of hot rolling mill according to claim 2 is characterized in that n=7, m=3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210545756.5A CN103028606B (en) | 2012-12-17 | 2012-12-17 | Method for protecting rolling rollers after steel clamping of finishing rolling mill group of hot rolling plant |
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| CN201210545756.5A CN103028606B (en) | 2012-12-17 | 2012-12-17 | Method for protecting rolling rollers after steel clamping of finishing rolling mill group of hot rolling plant |
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| CN103028606B CN103028606B (en) | 2014-12-17 |
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Cited By (2)
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| CN110216153A (en) * | 2019-06-11 | 2019-09-10 | 攀钢集团攀枝花钢钒有限公司 | Control method and its milling train for roller gap shape |
| CN111318575A (en) * | 2020-02-28 | 2020-06-23 | 鞍钢股份有限公司 | Safe and efficient processing method for hot rolling line accidents |
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Cited By (2)
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| CN110216153A (en) * | 2019-06-11 | 2019-09-10 | 攀钢集团攀枝花钢钒有限公司 | Control method and its milling train for roller gap shape |
| CN111318575A (en) * | 2020-02-28 | 2020-06-23 | 鞍钢股份有限公司 | Safe and efficient processing method for hot rolling line accidents |
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| CN103028606B (en) | 2014-12-17 |
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