CN103752622A - Heavy plate rolling control method for removing defect on edge of continuous casting bloom - Google Patents
Heavy plate rolling control method for removing defect on edge of continuous casting bloom Download PDFInfo
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Abstract
A heavy plate rolling control method for removing defects on the edges of a continuous casting bloom comprises the following steps: (1) rotating the continuous casting bloom before pressing upon the continuous casting bloom are taken out of a furnace to enable edges of both lateral sides of the continuous casting bloom to be a top end and a tail end of the continuous casting bloom to be rolled to enter a rolling mill and starting rolling in a forming stage; (2) adopting a rolling method for spreading a heavy plate edge in the last rolling for forming; (3) rotating the continuous casting bloom 90 degrees upon completing rolling in the forming stage to enable edges of the other sides of the continuous casting bloom to revert to the top end and the tail end of the continuous casting bloom to enter the rolling mill and starting rolling in a stage for spreading the heavy plate edge; (4) adopting the rolling method for spreading the heavy plate edge in the last rolling for spreading the heavy plate edge; (5) rotating the continuous casting bloom 90 degrees upon completing the stage for spreading the heavy plate edge in the last rolling for spreading the heavy plate edge and starting rolling in a finishing rolling stage; (6) starting a process for finishing cutting plate. According to this method, the three-time rotating rolling enables defects on the edges of the continuous casting bloom to transfer to a top end part and a tail end part of a heavy plate which are to be cut off and is capable of maintaining an advantage of shape control of the two-time rotating control in the prior art and prevent a finishing steel plate from convexity, thereby reducing amounts of trimming and cutting loss practically.
Description
Technical field
The present invention relates to the operation of rolling control technology of heavy plate mill, relate in particular to a kind of heavy plate rolling control method of eliminating strand edge fault.
Background technology
In slab production process, there is crack defect in finished steel edges of boards portion sometimes, and these steel plate edges that comprise defect all need cut, thereby reduce the recovery rate of product, and then reduced productivity effect.Therefore, for Strip edge fault problem, be necessary to take technical measures, alleviate and even eliminate the generation of edge fault.The specific definition of limit portion crack defect is:
Hot-strip limit is split defect and is referred to that (the Di Hongshuan etc. that break appear in one or both sides along its length, steel plate edge, < < hot rolled strip edge fault forms mechanism and present Research > >, Henan Metallurgical, in June, 2008).
Limit portion crack defect is in other documents, sometimes the limit portion line defect that is otherwise known as (edge seam defect, the removing method > > of < < low-carbon hot-rolled steel limit portion line defect, Chinese patent CN102699028A) or limit portion black line (summer Xiao Ming etc., the black line mechanism of production > > of < < hot-strip limit portion, steel research journal, in June, 2010).
The reason that produces limit portion crackle mainly contains two classes: the one, and the continuous casting billet defect that continuous casting production process causes, such as having, continuous casting billet marginal existence micro-crack, rimhole and limit portion be mingled with, these defects, in the rolling link of follow-up rolling, are exaggerated dominant displaying; The 2nd, the defect that the operation of rolling causes, the corner portion metal of rolled piece flow to the upper and lower surface (Di Hongshuan etc. of rolled piece in the operation of rolling, < < hot rolled strip edge fault forms mechanism and present Research > >, Henan Metallurgical, in June, 2008).
About limit portion crack defect, the coil of strip that existing patent and document great majority are produced for continuous hot-rolling mill, the technical scheme that rarer heavy plate mill is relevant is disclosed.
The similarities and differences of hot continuous rolling and heavy plate mill: identical point is: continuous hot-rolling mill and heavy plate mill all belong to hot rolling (hot rolling) process, rolled plate temperature is at 1200～700 ℃, and the product that both produce all cuts the part end to end of milling material.Difference: hot continuous rolling produces the milling train arrangement of the finishing mill employing multi-frame continuous rolling of line, the roughing mill that hot continuous rolling produces line is furnished with powerful edger roll or other side-pressing devices, be used for a continuous casting billet width adjustment to band steel finished width, the finishing mill that heavy plate mill produces line is singlestandmill, adopt the mode of production of reversing tandem rolling, heavy plate mill produces the independent single chassis roughing mill that has that line has, the double roughing mill of doing of some finishing mills, conventionally do not configure powerful edger roll, before and after milling train, be furnished with and turn steel rider road, by the steel plate 90 degree rotations before and after rolling pass, adjust steel plate width, so operation of rolling of heavy plate mill multi-pass, conventionally at twice steel of whole operation of rolling transfer, according to turning steel front and back, three rolling sequences have been divided into: the roll forming stage, broadening rolling sequence, extend rolling sequence, referring to Fig. 1, (detail is described and is seen < < China Medium and Heavy Plate Rolling technology and equipment > > 1.7.1 joint, Wang Guodong, metallurgical industry publishing house, 2009).
Owing to producing the reason of limit portion crackle, be divided into continuous casting working procedure reason and the large class of rolling process reason two, existing correlation technique for a certain class reason wherein, provides various technical schemes mostly.
The edge fault causing for rolling process, major measure comprises process management measures (referring to Chinese patent CN102699028A, CN101912875A) such as being intended to improve the inhomogeneity heating of temperature band steel transverse temperature, the use of rolling line cooling water; By side-pressing device, improve, the steel edge portion distortion that reduces the inhomogeneous deformation of limit portion improves (Japan Patent JP10156408) (summer Xiao Ming etc., the black line mechanism of production > > of < < hot-strip limit portion, steel research journal, in June, 2010); By adjusting the technological parameters such as horizontal rolling mill reduction amount and speed, alleviate limit portion inhomogeneous deformation situation (referring to Chinese patent CN102527735A).
The edge fault causing for continuous casting working procedure, major measure concentrates on research and development operation technique (the research > > of Chinese patent CN102101124, Wang Yao mountain < < application slab edge part shading technology solution Edge Cracks on Medium and Heavy Plate problem of process parameter optimizing and the continuous casting equipment of continuous casting working procedure, Gansu is metallurgical, in April, 2010 etc.).
The present invention is directed to the edge fault that continuous casting working procedure causes, utilize slab to turn the feature of steel rolling, design brand-new roll control scheme, eliminated the finished product edge fault of continuous casting working procedure reason at rolling process, this is the unusual part of the present invention.
Due to hereinafter more different while turning steel rolling method pluses and minuses, the flat shape profile of comparative steel board finished product is good and bad, so briefly introduce flat shape below, control (selecting from < < China Medium and Heavy Plate Rolling technology and equipment > > 1.7.4.1 joint).
" in Heavy Plate Production, affect lumber recovery because have crop end, trimming, iron scale, roll useless, mass defect etc., wherein flat shape bad cause cut the very large ratio that accounted for of damaging.How not rectangular flat shape after the particularity of Plate Rolling Process causes it to roll is, must carry out crop end and trimming and process before delivery.Therefore study the flat shape Changing Pattern in the operation of rolling, make the flat shape rectangle of rolled plate, reduce crop end and trimming loss, to improving the lumber recovery of steel plate, play an important role.
Flat shape control technology is actual is exactly the rectangle technology of rolled plate, the Main Means that flat shape is controlled is the change section blank rolling that adopts pony-roughing pass, foremost is MAS rolling (the Mizushima automatic plan view pattern control system of Kawasaki, Japan Shui Dao factory exploitation, Ji Shui island flat shape autocontrol method), when the initial shaping stage of rolling and broadening stage rolling, along rolling direction, rolled piece two ends are rolled into wedge shape, make four jiaos of rolled piece in the operation of rolling subsequently, to be filled, whole rolled piece is approximate rectangular, thereby reduced the loss of crop end and trimming.”
The plane control function based on webbing broadening rolling that has all possessed similar MAS rolling in current modernization heavy and medium plate mill.
For continuous casting working procedure, cause continuous casting billet limit portion micro-crack defect, and then the slab finished product edge fault causing, the measure of prior art scheme concentrates on continuous casting working procedure.Yet due to the direct export of continuous casting working procedure at present--the edge fault of continuous casting billet lacks enough accurate detection means, mainly by manually visually observing the defects such as bubble, pin hole of limit portion, take time and effort, loss is high, and there is no the defects such as micro-crack that directly manifest on surface, need after cutting sampling, with the section of microscopic examination sample, just can detect, this detection method is not suitable for large industrial production application.The difficulty that this has just caused continuous casting working procedure improvement effect to evaluate, when continuous casting working procedure changes to some extent, cycle that need to be longer, until after rolling completes, could judge that continuous casting working procedure changes the impact on edge fault, but also the generation reason of easy and Equations of The Second Kind defect is obscured.
Consider the production feature of heavy plate mill, if only turn steel in production process one time, make the limit portion of continuous casting billet finally be converted to steel plate end to end, the finishing of steel plate head portion after rolling can be cut before dispatching from the factory, and can eliminate the impact of continuous casting billet edge fault on finished product defect.In actual production practice, also find to adopt only once to turn the milling method of steel, edge fault incidence has obviously reduced, but another problem occurred, steel plate flat shape is bad.Owing to once turning steel, there is no shaping stage, the flat shape control method of last passage of shaping stage also cannot be used, cause the width of steel plate length direction very inhomogeneous, have significantly " bucket waist " (referring to Fig. 2), although edge fault lacked, because flat shape is bad, limit portion cuts not damage and declines, and does not reach the object of final raising lumber recovery.
Existing Patents and the open source literature that alleviates or eliminate hot continuous rolling, slab edge fault, take stopgap measures, and the continuous casting billet defect that continuous casting working procedure is caused concentrates on continuous casting working procedure and solves.Existing slab comprises that the technical scheme of hot continuous rolling operation concentrates on two aspects, the one, and the improvement of temperature correlation process parameter optimizing and cooling water equipment, the 2nd, the adjustment of the technological parameters such as the improvement of side-pressing device and horizontal rolling mill reduction amount, speed.With regard to heavy plate rolling process, these technical measures do not make full use of technique, the installation feature that slab is produced.On the other hand, only reduce and once turn steel, although caused the sideline problem solving, produced the bad new problem of flat shape, do not reach and reduce the final purpose that damage is cut by limit portion.
Summary of the invention
The object of the present invention is to provide a kind of heavy plate rolling control method of eliminating strand edge fault, the impact of the continuous casting billet edge fault that elimination continuous casting working procedure produces on slab finished product defect, reduce finished product steel plate edge excision loss, can fundamentally eliminate the slab edge fault that the continuous casting billet edge faults such as continuous casting billet micro-crack, pin hole cause, improve productivity effect.
For achieving the above object, technical scheme of the present invention is:
A heavy plate rolling control method of eliminating strand edge fault, comprises the steps:
1) after continuous casting billet is come out of the stove, arrive before milling train, before starting rolling, turn steel operation, after turning steel and completing, the limit portion both sides of original continuous casting billet become enter milling train rolled piece end to end, start the rolling of shaping stage, i.e. the former continuous casting billet limit portion that pre-exists quality of edges defect, has converted the part end to end of the rolled piece that enters milling train in roll forming stage to;
2) in last passage in roll forming stage, use webbing broadening milling method, the profile end to end of controlling finished steel plate with this is straight;
3) after shaping stage rolling completes, steel plate 90 degree turn steel, and original continuous casting billet both sides become the both sides of the rolled piece that enters milling train again, now start the rolling in broadening stage;
4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control two side profile straight of finished product;
5) after broadening stage rolling completes, steel plate again 90 degree turns steel, now original continuous casting billet two side portions be converted into enter milling train rolled piece end to end, start the rolling in last finish rolling stage, at final rolling sequence, the former limit portion that pre-exists the continuous casting billet of the defects such as bubble, has converted the part end to end of last mill product steel plate to;
6), after steel plate rolling completes, enter follow-up finishing cutting plate operation.
In milling method of the present invention,
After continuous casting billet is come out of the stove, arrive before milling train, before starting rolling, first turn steel operation, after turning steel and completing, the limit portion both sides of original continuous casting billet, become enter milling train rolled piece end to end, start the rolling of shaping stage, be the former continuous casting billet limit portion that pre-exists bubble, the equilateral portion of pin hole mass defect, converted the part end to end of the rolled piece that enters milling train in roll forming stage to.
In last passage in roll forming stage, use webbing broadening milling method, object is that the profile end to end of control finished product is straight;
After shaping stage rolling completes, steel plate 90 degree turns steel, and original continuous casting billet both sides become the both sides of the rolled piece that enters milling train again, now start the rolling in broadening stage;
In last passage of broadening rolling sequence, reuse webbing broadening milling method, object is to control two side profile straight of finished product;
After broadening stage rolling completes, steel plate again 90 degree turns steel, and original continuous casting billet two side portions now converts rolled piece in order to enter milling train to end to end, starts the rolling in last finish rolling stage.At final rolling sequence, the former limit portion that pre-exists the continuous casting billet of the defects such as bubble, has converted the part end to end of last mill product to.On the other hand, because last passage in the shaping stage above and broadening stage has been used webbing broadening milling method, guaranteed that the flat shape of finished steel plate is approximate rectangular, avoided appearance " bucket waist " phenomenon.
After steel plate rolling completes, enter follow-up finishing cutting plate operation.The sideline of now causing due to continuous casting billet defect has been transformed into the position end to end of finished steel plate by new milling method, the distance of steel plate end is arrived in 40mm in sideline, this is to be determined by factors such as the overall reductions of the operation of rolling, and owing to considering the steel plate fluctuation of material property end to end, steel plate excision amount is end to end more than 100mm, that is to say that the position that shows sideline defect pattern is less than and considers that the steel plate reality of material property excises distance end to end apart from the distance of steel plate end, thoroughly eliminated the impact that continuous casting billet quality of edges defect causes to slab finished product lumber recovery.
The main difference part of the present invention and prior art:
Existing mill milling process control technology, there is no the special control technology for steel plate edge defect, technical measures relevant to milling train in prior art scheme, nothing more than in: the adjustment optimization of reduction in pass and mill speed, steel plate sticks up discount controls use of (ski) coefficient and so on.
Existing mill milling flow process comprises five kinds, referring to Fig. 3～Fig. 7:
1. pattern a, directly axial rolling;
2. pattern b, rolls forward steel → transverse rolling;
3. pattern c, axial rolling → turn steel → transverse rolling;
4. pattern d, rolls forward steel → transverse rolling → turn steel → axial rolling;
5. pattern e, axial rolling → turn steel → transverse rolling → turn steel → axial rolling.
The control mode that wherein turns steel for twice is common pattern, i.e. pattern e.
For ease of explanation, below calling axial rolling along the rolling of continuous casting billet raw footage direction, calling transverse rolling along the former width rolling of continuous casting billet.
Technical scheme essence of the present invention is that the steel grade that edge fault is easily sent out is treated with a certain discrimination, has increased a kind of rolling mode f newly, rolls forward steel-transverse rolling-turn steel-axial rolling-turn steel-transverse rolling that is:.
Beneficial effect of the present invention:
The present invention is by the new course control method for use that turns steel rolling for three times, the edge fault of continuous casting billet has been transformed into the part end to end of final cut slab, retain original flat shape that turns steel rolling for twice simultaneously and controlled advantage, flat shape is controlled function and is normally moved, finished steel plate there will not be significant as only once turning steel " bucket waist " phenomenon, conscientiously reduced trimming amount, reduced and cut damage.
Technical solution of the present invention is produced line at slab and is implemented, and can promote lumber recovery 2% left and right.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of three rolling sequences of existing Medium and Heavy Plate Rolling technology.
Fig. 2 is the schematic diagram of one of steel plate defect phenomenon " bucket waist ".
Fig. 3～Fig. 7 is the schematic diagram of five kinds of patterns in existing mill milling flow process.
Fig. 8 is the schematic diagram of the inventive method (pattern f).
Fig. 9 is the control flow chart of the embodiment of the present invention.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
Referring to Fig. 8, a kind of heavy plate rolling control method of eliminating strand edge fault of the present invention, comprises the steps:
1) after continuous casting billet is come out of the stove, arrive before milling train, before starting rolling, turn steel operation, after turning steel and completing, the limit portion both sides of original continuous casting billet become enter milling train rolled piece end to end, start the rolling of shaping stage, i.e. the former continuous casting billet limit portion that pre-exists quality of edges defect, has converted the part end to end of the rolled piece that enters milling train in roll forming stage to;
2) in last passage in roll forming stage, use webbing broadening milling method, the profile end to end of controlling finished steel plate with this is straight;
3) after shaping stage rolling completes, steel plate 90 degree turn steel, and original continuous casting billet both sides become the both sides of the rolled piece that enters milling train again, now start the rolling in broadening stage;
4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control two side profile straight of finished product;
5) after broadening stage rolling completes, steel plate again 90 degree turns steel, now original continuous casting billet two side portions be converted into enter milling train rolled piece end to end, start the rolling in last finish rolling stage, at final rolling sequence, the former limit portion that pre-exists the continuous casting billet of the defects such as bubble, has converted the part end to end of last mill product steel plate to;
6), after steel plate rolling completes, enter follow-up finishing cutting plate operation.
The specific embodiment in the slab automation control system based on model process control is as follows:
The easy hair-care articles kind of model edge fault special code, according to easy hair-care articles kind special code, give the mill milling process control pattern making new advances, turn punching block formula three times, at three times, turn under punching block formula, when continuous casting billet, come out of the stove and arrive turning behind position, steel rider road before roughing mill, control system provides and turns steel instruction, operating personnel complete and turn steel operation, model system is adopted new plate size information, then automatically complete post forming, broadening, the rolling in extension stage, the finished product after rolling completes need excise operation end to end at finishing procedure.
1, set up edge fault and easily send out steel grade code table
In production schedule arranging system, increase edge fault and easily send out steel grade code table, when working out a production plan, if treat that rolled steel plate is that edge fault is easily sent out the type in steel grade code table, generate new rolling mode sign (representing the rolling mode f shown in Fig. 8 of the present invention).Concrete steel grade obtains according to knowhow.
2, the milling train setting model control system of milling train
When receiving continuous casting billet to be rolled and possess new rolling mode sign, automatically proceed to new roll control pattern, particular flow sheet is as follows.
2.1 flipper guides are opened the given of width automatically
Not grazing of steel plate flipper guide while turning steel for assurance, flipper guide is opened aperture and is calculated as follows.
Wherein: side_guide_open_width: flipper guide is opened aperture, unit: mm;
Slab_length: continuous casting billet length; Slab_width: continuous casting billet width, unit: mm.
2.2 roll forward steel finish after, the adjustment of continuous casting billet dimension information and again carry out milling train setting
After rolling forward steel and finishing, should return original mill milling process control flow, because carried out turning steel operation, continuous casting billet length and width dimension information in control system need to be exchanged again, complete after the exchanging of length and width dimension information, re-execute the precomputation function of milling train setting model, milling train is according to the continuous casting billet information of upgrading, adopt conventional secondary to turn steel and calculate setting process, provide corresponding road number of times, drafts, speed etc. technique initialization parameter, the operation of rolling turns steel flow process according to secondary to be proceeded, until finish.
The part end to end of rolling slab is changed in the limit portion of continuous casting billet like this, and part is cut at follow-up finishing procedure end to end, thereby has thoroughly eliminated the impact that continuous casting billet quality of edges defect causes to slab finished product.On the other hand, owing to having retained, remaining turn steel twice, flat shape is controlled function and is normally moved, and finished steel plate there will not be significant as only once turning steel " bucket waist " phenomenon, has conscientiously reduced trimming amount, reduced and cut damage.
Embodiment
If continuous casting billet length slab_length3 rice, 2 meters of width, steel grade is that certain easily sends out edge fault steel grade.
Referring to Fig. 9, working out a production plan the stage before rolling, the new rolling mode label that this continuous casting billet is stamped in computer system.
Before rolling, milling train is controlled model and is judged the new rolling mode of employing.
When steel plate, come behind roughing mill forward steel rider road, control system automatically provides and turns steel instruction, and opens flipper guide.
Flipper guide aperture=461mm.
After turning steel and completing, in control system, slab_length=2m, slab_width=3m, and data based on this, proceed to secondary and turn punching block formula, re-starts rolling and set and calculate, and according to this result of calculation, continued the follow-up operation of rolling.
The present invention adapts to wide, and easy to use, has solved the slab edge fault that continuous casting billet edge fault that continuous casting working procedure causes causes, and has on the heavy plate mill that automation controls, and this technology can be promoted the use of completely, have wide Technique Popularizing prospect.
Claims (1)
1. a heavy plate rolling control method of eliminating strand edge fault, comprises the steps:
1) after continuous casting billet is come out of the stove, arrive before milling train, before starting rolling, turn steel operation, after turning steel and completing, the limit portion both sides of original continuous casting billet become enter milling train rolled piece end to end, start the rolling of shaping stage, i.e. the former continuous casting billet limit portion that pre-exists quality of edges defect, has converted the part end to end of the rolled piece that enters milling train in roll forming stage to;
2) in last passage in roll forming stage, use webbing broadening milling method, the profile end to end of controlling finished steel plate with this is straight;
3) after shaping stage rolling completes, steel plate 90 degree turn steel, and original continuous casting billet both sides become the both sides of the rolled piece that enters milling train again, now start the rolling in broadening stage;
4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control two side profile straight of finished product;
5) after broadening stage rolling completes, steel plate again 90 degree turns steel, now original continuous casting billet two side portions be converted into enter milling train rolled piece end to end, start the rolling in last finish rolling stage, at final rolling sequence, the former limit portion that pre-exists the continuous casting billet of the defects such as bubble, has converted the part end to end of last mill product steel plate to;
6), after steel plate rolling completes, enter follow-up finishing cutting plate operation.
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| CN104148405A (en) * | 2014-08-21 | 2014-11-19 | 柳州钢铁股份有限公司 | Plate shape control method in broadening phase of medium thickness plate |
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