CN103752622B - A kind of heavy plate rolling control method eliminating strand edge fault - Google Patents

Abstract

A kind of heavy plate rolling control method eliminating strand edge fault, comprises the steps: 1) after continuous casting billet comes out of the stove, before starting rolling, carry out turning steel, former continuous casting billet edge both sides become entrance milling train rolled piece end to end, start shaping stage rolling；2) last passage of roll forming, uses webbing broadening milling method；3) shaping stage has rolled rear steel plate 90 degree and has turned steel, and original continuous casting billet both sides become the both sides entering milling train rolled piece again, start broadening stage rolling；4) broadening rolls last passage, uses webbing broadening milling method；5) after broadening stage rolling completes steel plate again 90 degree turn steel, start the rolling in last finish rolling stage；6) finishing cutting plate operation is entered.The present invention is by turning steel rolling three times, continuous casting billet edge fault is transformed into the most cut slab part end to end, retains the plan view control advantage of original twice turn of steel rolling, and finished steel plate does not haves " bucket waist " phenomenon, conscientiously reduce trimming amount, decrease and cut damage.

Description

A kind of heavy plate rolling control method eliminating strand edge fault

Technical field

The present invention relates to the operation of rolling control technology of heavy plate mill, particularly relate to a kind of elimination strand limit The heavy plate rolling control method of portion's defect.

Background technology

During Heavy plate production, finished steel plate edge is it sometimes appear that crack defect, and these comprise scarce The steel plate edge fallen into is required for cut, thus reduces the recovery rate of product, and then reduces production effect Benefit.Therefore, for Strip edge fault problem, it is necessary to take technical measures, alleviate or even disappear Generation except edge fault.Being specifically defined as of edge cracks defect:

Hot-strip limit is split defect and is referred to that rupturing occur in one or both sides along its length, steel plate edge (Di Hongshuan etc., " hot rolled strip edge fault formation mechenism and present Research ", Henan Metallurgical, 2008 June in year).

Edge cracks defect in other documents, the edge that is sometimes otherwise known as line defect (edge seam Defect, " removing method of low-carbon hot-rolled steel edge line defect ", Chinese patent CN102699028A) or edge black line (summer Xiao Ming etc., " hot-strip edge black line mechanism of production ", Steel research journal, in June, 2010).

The reason producing edge cracks mainly has two classes: one is that the continuous casting billet that continuous casting production process causes lacks Falling into, such as continuous casting billet marginal existence micro-crack, rimhole and edge have and are mingled with, and these defects exist The rolling link of follow-up rolling, is exaggerated dominant displaying；Two is the defect that the operation of rolling causes, The corner metal of rolled piece flow to upper and lower surface (Di Hongshuan etc. the, " heat of rolled piece in the operation of rolling Roll strip edge fault formation mechenism and present Research ", Henan Metallurgical, in June, 2008).

The steel produced for continuous hot-rolling mill about edge cracks defect, existing patent and document great majority Volume, the technical scheme that rarer heavy plate mill is relevant is disclosed.

Hot continuous rolling and the similarities and differences of heavy plate mill: identical point is: continuous hot-rolling mill and heavy plate mill broadly fall into heat Rolling (hot rolling) process, rolled plate temperature is at 1200～700 DEG C, and the product that both produce is all Cut the part end to end of milling material.Difference: hot continuous rolling produces the finishing mill of line and uses multi-frame to roll continuously The milling train arrangement of system, hot continuous rolling produces the roughing mill of line and is disposed with strength edger roll or other side pressures dress Putting, be used for continuous casting billet width adjustment to band steel finished width, it is single that heavy plate mill produces the finishing mill of line Machine frame rolling mill, uses the mode of production of reversing tandem rolling, and what heavy plate mill product line had has single list Frame roughing mill, some finishing mills also serve as roughing mill, the most do not configure strength edger roll, cloth before and after milling train It is equipped with and turns steel rider road, by the steel plate before and after rolling pass 90 degree rotation, adjust steel plate width, institute With the operation of rolling of heavy plate mill multi-pass, generally at whole twice steel of operation of rolling transfer, according to turning Three rolling sequences it have been divided into: roll forming stage, broadening rolling sequence, extension roll before and after steel In the stage, seeing Fig. 1, (detail describes and sees " China's Medium and Heavy Plate Rolling technology and equipment " 1.7.1 Joint, Wang Guodong, metallurgical industry publishing house, 2009).

Divide into continuous casting working procedure reason due to the reason of generation edge cracks and rolling process reason two is big Class, existing correlation technique for the most a certain class reason, provides various technical scheme mostly.

The edge fault caused for rolling process, it is horizontal that major measure includes being intended to improve temperature band steel The process management measures such as the heating of temperature homogeneity, rolling line cooling water use (see Chinese patent CN 102699028A, CN101912875A)；Improved by side-pressing device, reduce the uneven change of edge The steel edge portion deformation of shape improves (Japan Patent JP10156408) (summer Xiao Ming etc., " hot-strip Edge black line mechanism of production ", steel research journal, in June, 2010)；Rolled by adjustment level The technological parameters such as machine drafts and speed are alleviated edge inhomogeneous deformation situation and (are seen Chinese patent CN102527735A).

The edge fault caused for continuous casting working procedure, major measure concentrates on the technological parameter of continuous casting working procedure The research and development of optimization and continuous casting equipment use technology, and (Chinese patent CN102101124, Wang Yaoshan " should The research of Edge Cracks on Medium and Heavy Plate problem is solved by slab edge part shading technology ", Gansu is metallurgical, 2010 4 Month 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, if Counting out brand-new roll control scheme, the finished product edge eliminating continuous casting working procedure reason at rolling process lacks Falling into, this is the unusual part of the present invention.

Owing to hereinafter when turning steel rolling method pluses and minuses, steel plate finished product will be compared more different Flat shape profile is good and bad, (selects from " thick in China so plan view control is briefly described below Plate rolling technique and equipment " 1.7.4.1 joint).

" in Heavy Plate Production, affect lumber recovery because of have crop end, trimming, iron scale, Rolling useless, mass defect etc., wherein the bad damage of cutting caused of flat shape account for the biggest ratio.Middle thickness Flat shape after the particularity of the plate operation of rolling causes it to roll is much the most rectangular, necessary before delivery Carry out crop end and trimming processes.Therefore the flat shape Changing Pattern in the research operation of rolling, makes to roll The flat shape of steel plate processed is squaring, reduces crop end and trim losses, to the lumber recovery improving steel plate Play an important role.

It is exactly the squaring technology of rolled plate that flat shape controls technology actual, plan view control Main Means is the Varied section blank rolling using pony-roughing pass, and foremost is Kawasaki, Japan Shui Dao factory Exploitation MAS rolling (Mizushima automatic plan view pattern control system, Ji Shui island flat shape autocontrol method), rolling initial shaping stage and broadening stage rolling Time, along rolling direction, rolled piece two ends are rolled into wedge shape, make the corner of rolled piece in the operation of rolling subsequently Being filled, whole rolled piece is approximate rectangular, thus decreases the loss of crop end and trimming.”

Current modernization heavy and medium plate mill has all possessed similar MAS rolling based on webbing The plane control function of broadening rolling.

Continuous casting billet edge micro-crack defect, and then the slab finished product edge caused is caused for continuous casting working procedure Defect, the measure of prior art concentrates on continuous casting working procedure.Straight yet with current continuous casting working procedure Connecing export--the edge fault of continuous casting billet lacks sufficiently accurate detection means, mainly by artificial naked eyes Observing the defects such as the bubble of edge, pin hole, take time and effort, loss is high, and the most directly at table The defects such as the micro-crack that face manifests, after needing cutting sampling, observe sample sections with microscope and could examine Measuring, this detection method is not suitable for the application of big industrial production.This has resulted in continuous casting working procedure improvement The difficulty of effect assessment, when continuous casting working procedure is varied from, needs the longer cycle, until rolling After completing, the continuous casting working procedure change impact on edge fault could be judged, but also easily lack with Equations of The Second Kind The producing cause fallen into is obscured.

Consider the productive prospecting of heavy plate mill, if production process only turns a steel so that continuous casting billet Edge be ultimately converted to steel plate end to end, the finishing after rolling of the steel plate head portion can be cut before dispatching from the factory Remove, the impact on finished product defect of the continuous casting billet edge fault can be eliminated.Actual production practice in it has also been found that Using the milling method only once turning steel, edge fault incidence considerably reduces, but another is asked Topic occurs in that, i.e. steel plain shape defect.Owing to once turning steel, there is no shaping stage, shape rank The plan view control method of last passage of section also cannot use, and causes the width in steel plate length direction The most uneven, have significantly " bucket waist " (seeing Fig. 2), although edge fault is few, but Owing to flat shape is bad, edge is cut damage and is not declined, and is not reaching to final raising lumber recovery Purpose.

Existing hot continuous rolling, the Patents of slab edge fault and open source literature, head are mitigated or eliminated Pain doctor's head, pin pain doctor's pin, the slab defects causing continuous casting working procedure concentrates on continuous casting working procedure and solves. Existing slab includes that the technical scheme of hot continuous rolling operation concentrates on two aspects, and one is temperature related process Parameter optimization and the improvement of cooling water equipment, two be the improvement of side-pressing device and horizontal rolling mill reduction amount, The adjustment of the technological parameters such as speed.With regard to heavy plate rolling process, these technical measures the most fully profit With the technique of Heavy plate production, installation feature.On the other hand, only reduce and once turn steel, then cause Though the sideline problem solved, create the new problem that flat shape is bad, it is not reaching to reduce Edge cuts the final purpose of damage.

Summary of the invention

It is an object of the invention to provide a kind of heavy plate rolling control method eliminating strand edge fault, The continuous casting billet edge fault that elimination continuous casting working procedure the produces impact on slab finished product defect, reduces finished steel The excision loss of edges of boards portion, can be inherently eliminated the continuous casting billet edge such as continuous casting billet micro-crack, pin hole and lack Fall into the slab edge fault caused, improve productivity effect.

For reaching above-mentioned purpose, the technical scheme is that

A kind of heavy plate rolling control method eliminating strand edge fault, comprises the steps:

1) after continuous casting billet is come out of the stove, before arriving milling train, before starting rolling, carry out turning steel operation, turn steel After completing, the edge both sides of original continuous casting billet become the rolled piece of entrance milling train end to end, start The rolling of shaping stage, is i.e. originally present the continuous casting billet edge of quality of edges defect, is converted into The part end to end of the rolled piece entering milling train in roll forming stage；

2) in last passage in roll forming stage, use webbing broadening milling method, control with this The profile end to end of finished steel plate is straight；

3) after shaping stage has rolled, steel plate 90 degree turns steel, and original continuous casting billet both sides become again Enter the both sides of the rolled piece of milling train, now start the rolling in broadening stage；

4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control Two side profile of finished product straight；

5) after broadening stage rolling completes, steel plate again 90 degree turn steel, now original continuous casting billet two Side part is converted into and enters the rolled piece of milling train end to end, starts rolling of last finish rolling stage System, i.e. at final rolling sequence, is originally present the edge of the continuous casting billet of the defects such as bubble, It is converted to the part end to end of last mill product steel plate；

6), after steel plate rolling completes, follow-up finishing cutting plate operation is entered.

In milling method of the present invention,

After continuous casting billet is come out of the stove, before arriving milling train, before starting rolling, first carry out turning steel operation, turn After steel completes, the edge both sides of original continuous casting billet, become and enter the rolled piece of milling train end to end, start into The rolling in shape stage, is i.e. originally present the continuous casting billet edge of the edge mass defect such as bubble, pin hole, turns Change the part end to end of the rolled piece entering milling train in roll forming stage into.

In last passage in roll forming stage, use webbing broadening milling method, it is therefore an objective to control The profile end to end of finished product is straight；

After shaping stage has rolled, steel plate 90 degree turns steel, original continuous casting billet both sides, again becomes Enter the both sides of the rolled piece of milling train, now start the rolling in broadening stage；

In last passage of broadening rolling sequence, reuse webbing broadening milling method, it is therefore an objective to Control two side profile straight of finished product；

After broadening stage rolling completes, steel plate again 90 degree turn steel, now original continuous casting billet both sides Part, is converted into the rolled piece in order to enter milling train end to end, starts the rolling in last finish rolling stage. I.e. at final rolling sequence, it is originally present the edge of the continuous casting billet of the defects such as bubble, is converted to The part end to end of rear mill product.On the other hand, due in shaping stage above and broadening stage Last passage employs webbing broadening milling method, it is ensured that the flat shape approximation square of finished steel plate Shape, it is to avoid " bucket waist " phenomenon occurs.

After steel plate rolling completes, enter follow-up finishing cutting plate operation.Now make due to slab defects The sideline become has been transformed into the position end to end of finished steel plate by new milling method, and sideline is to steel plate end Distance is within 40mm, and this is to be determined by factors such as the overall reductions of the operation of rolling, and owing to examining Considering the fluctuation to steel plate material property end to end, steel plate resection end to end is at more than 100mm, namely Say that the position the showing sideline defect pattern distance away from steel plate end is much smaller than in view of material property Steel plate reality excise distance end to end, i.e. completely eliminate continuous casting billet quality of edges defect to slab finished product The impact that lumber recovery causes.

In place of the main difference of the present invention and prior art:

Existing mill milling process control technology, does not control skill specially for steel plate edge defect Art, technical measures relevant to milling train in prior art scheme, nothing more than in: reduction in pass and roll The adjusting and optimizing of speed processed, steel plate sticks up use of discount control (ski) coefficient etc.

Existing mill milling flow process includes five kinds, sees Fig. 3～Fig. 7:

1. pattern a, direct 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.

Wherein the control mode of twice turn of steel is common pattern, i.e. pattern e.

For purposes of illustration only, the rolling along continuous casting billet raw footage direction is called axial rolling, along continuous casting below The rolling of base former width is referred to as transverse rolling.

Technical scheme essence is that the steel grade easily sent out edge fault is treated with a certain discrimination, has increased one newly Kind of rolling mode f, it may be assumed that roll forward steel-transverse rolling-turn steel-axial rolling-turn steel-transverse rolling.

Beneficial effects of the present invention:

The present invention is by the new course control method for use turning steel rolling for three times, and the edge fault of continuous casting billet turns Change to the part end to end of final cut slab, remain the flat of original twice turn of steel rolling simultaneously Face shape controls advantage, and plan view control function is properly functioning, and finished steel plate does not haves as only one Secondary turn steel the most significant " bucket waist " phenomenon, conscientiously reduce trimming amount, decrease and cut damage.

Technical solution of the present invention is produced line at slab and is implemented, and can promote lumber recovery about 2%.

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 inventive method (schematic diagram of pattern f).

Fig. 9 is the control flow chart of the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.

See Fig. 8, a kind of heavy plate rolling control method eliminating strand edge fault of the present invention, bag Include following steps:

1) after continuous casting billet is come out of the stove, before arriving milling train, before starting rolling, carry out turning steel operation, turn steel After completing, the edge both sides of original continuous casting billet become the rolled piece of entrance milling train end to end, start The rolling of shaping stage, is i.e. originally present the continuous casting billet edge of quality of edges defect, is converted into The part end to end of the rolled piece entering milling train in roll forming stage；

2) in last passage in roll forming stage, use webbing broadening milling method, control with this The profile end to end of finished steel plate is straight；

3) after shaping stage has rolled, steel plate 90 degree turns steel, and original continuous casting billet both sides become again Enter the both sides of the rolled piece of milling train, now start the rolling in broadening stage；

4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control Two side profile of finished product straight；

5) after broadening stage rolling completes, steel plate again 90 degree turn steel, now original continuous casting billet two Side part is converted into and enters the rolled piece of milling train end to end, starts rolling of last finish rolling stage System, i.e. at final rolling sequence, is originally present the edge of the continuous casting billet of the defects such as bubble, It is converted to the part end to end of last mill product steel plate；

6), after steel plate rolling completes, follow-up finishing cutting plate operation is entered.

Detailed description of the invention in the slab automation control system controlled based on model process is as follows:

Initially set up edge fault easy hair-care articles kind special code, according to easy hair-care articles kind special code, be given New mill milling process control pattern, turns punching block formula i.e. three times, turns under punching block formula at three times, when even Strand come out of the stove arrive before roughing mill turn position, steel rider road after, control system is given and turns steel instruction, operation Personnel complete to turn steel operation, and model system is adopted new plate size information, is then automatically performed follow-up Shaping, broadening, the rolling in extension stage, the finished product after having rolled need to be carried out end to end at finishing procedure Excision operation.

1, set up edge fault and easily send out steel grade code table

In production schedule arranging system, increase edge fault easily send out steel grade code table, when establishment produces meter When drawing, if treating that rolled steel plate is the type that edge fault easily sends out in steel grade code table, then generate new rolling Mode flags (represents the rolling mode f) shown in Fig. 8 of the present invention.Concrete steel grade is according to producing warp Test acquisition.

2, the milling train setting model control system of milling train

When receiving continuous casting billet to be rolled and possessing new rolling mode mark, automatically proceed to new roll control mould Formula, particular flow sheet is as follows.

2.1 flipper guides automatically open up the given of width

Steel plate not grazing flipper guide during for ensureing to turn steel, flipper guide is opened aperture and is calculated as follows.

$\mathrm{side}\_\mathrm{guide}\_\mathrm{open}\_\mathrm{width}=\sqrt{\mathrm{slab}\_{\mathrm{width}}^2+\mathrm{slab}\_{\mathrm{length}}^2}+100.0---\left(1\right)$

Wherein: side_guide_open_width: flipper guide opens aperture, unit: mm;

Slab_length: continuous casting billet length；Slab_width: continuous casting billet width, unit: mm.

2.2 roll after forward steel terminates, the adjustment of continuous casting billet dimension information and again carry out milling train setting

Roll after forward steel terminates, it should return original mill milling process control flow, because carrying out Turning steel operation, continuous casting billet length and width dimension information in the controls needs again to exchange, and completes long After the exchanging of wide dimension information, re-executing the precomputation function of milling train setting model, milling train is according to more The new continuous casting billet information crossed, uses conventional secondary to turn steel and calculates setting process, provide corresponding passage Number, drafts, speed etc. technique initialization parameter, the operation of rolling according to secondary turn steel flow process continue into OK, until terminating.

So edge of continuous casting billet is changed into the part end to end of rolling slab, and part is in follow-up essence end to end Whole operation is cut, thus completely eliminates the shadow that continuous casting billet quality of edges defect causes to slab finished product Ring.On the other hand, owing to remaining remaining twice turn of steel, plan view control function is properly functioning, Finished steel plate does not haves significant as only once turning steel " bucket waist " phenomenon, conscientiously reduces Trimming amount, decreases and cuts damage.

Embodiment

If continuous casting billet length slab_length3 rice, width 2 meters, steel grade is that certain easily sends out edge fault steel Kind.

Seeing Fig. 9, working out a production plan the stage before the rolling, this continuous casting billet is in computer systems The new rolling mode label stamped.

Before the rolling, milling train Controlling model is judged to use new rolling mode.

After roughing mill forward steel rider road come by steel plate, control system is automatically given and turns steel instruction, and beats Open flipper guide.

Flipper guide aperture=461mm.

When turning after steel completes, in the controls, slab_length=2m, slab_width=3m, And data based on this, proceed to secondary and turn punching block formula, re-start rolling setup algorithm, according to this Secondary result of calculation has continued the follow-up operation of rolling.

The present invention adapts to wide, and easy to use, solves the continuous casting billet edge that continuous casting working procedure causes and lacks Falling into the slab edge fault caused, on the heavy plate mill with Automated condtrol, this technology is entirely capable of Enough promote the use of, there is wide Technique Popularizing prospect.

Claims (1)

1. eliminate a heavy plate rolling control method for strand edge fault, it is characterized in that, including walking as follows Rapid:

1) after continuous casting billet is come out of the stove, before arriving milling train, before starting rolling, carry out turning steel operation, turn steel After completing, the edge both sides of original continuous casting billet become the rolled piece of entrance milling train end to end, start The rolling of shaping stage, is i.e. originally present the continuous casting billet edge of quality of edges defect, is converted into The part end to end of the rolled piece entering milling train in roll forming stage；

2) in last passage in roll forming stage, use webbing broadening milling method, control with this The profile end to end of finished steel plate is straight；

3) after shaping stage has rolled, steel plate 90 degree turns steel, and original continuous casting billet both sides become again Enter the both sides of the rolled piece of milling train, now start the rolling in broadening stage；

4) in last passage of broadening rolling sequence, reuse webbing broadening milling method, control Two side profile of finished product straight；

5) after broadening stage rolling completes, steel plate again 90 degree turn steel, now original continuous casting billet two Side part is converted into and enters the rolled piece of milling train end to end, starts rolling of last finish rolling stage System, i.e. at final rolling sequence, is originally present the edge of the continuous casting billet of the defects such as bubble, It is converted to the part end to end of last mill product steel plate；

6), after steel plate rolling completes, follow-up finishing cutting plate operation is entered.