CN101670371B - Method for controlling quality of edges of intermediate slabs - Google Patents
Method for controlling quality of edges of intermediate slabs Download PDFInfo
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- CN101670371B CN101670371B CN2008100426598A CN200810042659A CN101670371B CN 101670371 B CN101670371 B CN 101670371B CN 2008100426598 A CN2008100426598 A CN 2008100426598A CN 200810042659 A CN200810042659 A CN 200810042659A CN 101670371 B CN101670371 B CN 101670371B
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Abstract
The invention discloses a method for controlling the quality of edges of intermediate slabs. Controlling equipment comprises a slab sizing press machine, a four-roll invertible roughing No.2 stand with a vertical roll and a finishing vertical roll. The method comprises the following steps: 1) according to the width of strip steel finished products, determining a finishing target width FET; 2) determining a finishing natural spread FS; 3) determining the maximum effective edging of the finishing vertical roll Wf; 4) according to values calculated in steps 1 to 3, obtaining a roughing outlet target width RET; 5) determining a roughing No.2 stand multi-pass natural spread alpha; 6) determining a roughing No.2 stand multi-pass total rolling reduction RW, and distributing a reduction gradient of each pass; 7) according to values calculated in steps 4 to 6, obtaining a slab target width WB; and 8) according to the value of the slab target width WB, setting the edging of the slab sizing press machine as 0, idling first two passes of the four-roll invertible roughing No.2 stand, and making the reduction gradient in subsequent passes gradually increased, wherein the finishing vertical rolladopts the maximum effective edging.
Description
Technical field
The present invention relates to the hot rolling technical field, relate in particular to the control method of a kind of strip edge portion quality.
Background technology
Along with the continuous developing of hot rolling high value added product, for some comparatively special product, for example tapping temperature is greater than the band steel more than 1350 ℃, owing to be subjected to the too high influence of temperature, the band steel of this moment softer (fusing point of general hot-strip is at 1380-1420 ℃).At this type of band steel, in the production process of hot rolling, find that there is certain defective in (intermediate slab) on the roughing supplied materials at present.
The tool strip body that relates to is as follows:
| Sequence number | The band grade of steel | Rolling specs | Limit portion situation |
| 1 | 7832370700 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 28mm |
| 2 | 7832371000 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 36mm |
| 3 | 7832371300 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 40mm |
| 4 | 7832371600 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 24mm |
| 5 | 7832372200 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 36mm |
| 6 | 7832372500 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 20mm |
| 7 | 7832372800 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 22mm |
| 8 | 7832373100 | 2.51*1100 | The full long leg breach in both sides, maximum breach degree of depth 30mm |
Analyzing its main influence is, when this type of defective, enter the hot rolling tandem mill after, owing to be the pattern that does not change strip edge portion in the tandem rolling frame, certainly will the quality of edges of product be impacted like this, how effectively to improve present situation for this reason, just seem comparatively urgent.
In existing hot rolling side pressure control technology, for the side pressure that relates to, hope is carried out big side pressure in the high temperature section of band steel, ability with the side pressure that reaches the rolling line maximum, newly-built in recent years hot rolling is produced in the line, all disposed the bigger slab large lateral pressure machine of ability, satisfied and produce the control requirement of line for the width side pressure.But for the limit portion from roughing outlet supplied materials exist unusual, at present do not see have any technology to be controlled, only technology also only relates in the cold rolling stage limit portion that is with steel is excised.On the just present equipment from the hot rolling roughing to finish rolling, generally be mainly roughing high-pressure water descaling case, slab large lateral pressure machine, two roller roughing mills, four roller reversible roughing mills of band edger roll, stay-warm case, delay table, crop flying shear, finish rolling high-pressure water descaling case, edger roll before the finish rolling, mm finishing mill unit, the laminar flow cooling, equipment such as coiling machine are formed, from present control, four roller reversible roughing mills of general employing slab large lateral pressure machine and band edger roll carry out the control on the strip width, adopt above-mentioned control, because the band steel is under the situation near band steel fusing point, the band steel is softer, to cause being with the steel card stifled, directly have influence on normal production.
By to the retrieval material analysis.Present unusual for strip edge portion, the general method that adopts excision is seen Chinese patent publication number CN1888118, its control relates generally to cold rolling, so it is for the unusual control of hot-strip limit portion, with the bigger difference of this programme existence.In the method for setting up optimized width of the disclosed a kind of rough rolling strip steel of Chinese patent publication number CN1959682, its core content is to determine the natural width spread of material in the finish rolling operation of rolling, and determines the roughing target width of material on this basis.After patent retrieval material analysis, do not see similar techniques to other yet.
Summary of the invention
The objective of the invention is by a kind of control method of intermediate slab quality of edges is provided, improve by side pressure control rolling line, thereby solve the irregular shape that the limit portion after being with the roughing of steel process rolling exists, the quality of edges of band steel improves in the middle of making.Avoided stifled, effectively raised production efficiency because of the softer production ply-yarn drill that causes of band steel.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of control method of intermediate slab quality of edges, the equipment of control comprise four roller reversible roughing 2# frame and finish rolling edger rolls of slab large lateral pressure machine, band edger roll, may further comprise the steps:
1) according to band steel finished width, determines finish rolling target width FET;
2) determine finish rolling natural width spread FS;
3) determine the maximum effectively lateral pressure amount Wf of finish rolling edger roll;
4) value of trying to achieve according to above-mentioned steps 1-3 draws roughing export goal width RET;
5) determine roughing 2# frame multi-pass natural width spread α;
6) determine roughing 2# frame multi-pass overall reduction RW, distribute the reduction ratio of each passage;
7) value of trying to achieve according to step 4-6 draws slab target width WB;
8) according to the value of slab target width WB, the lateral pressure amount of setting slab large lateral pressure machine is 0; The empty mistake of preceding two passages of four roller reversible roughing 2# frames, back percentage pass reduction increases gradually; The finish rolling edger roll adopts maximum effectively lateral pressure amount, 3-5mm (empirical parameter).
Preferably, the computing formula of the finish rolling target width FET of described step 1) is:
FET=FDT+FT, in the formula:
FET---finish rolling target width, mm;
The FDT---finished width, mm;
The FT---additional amount, span 0-12mm.
Preferably, the computing formula of finish rolling natural width spread FS described step 2) is:
FS---finish rolling natural width spread, mm;
A1---process coefficient, span: 0.00-0.002;
H1---band steel target thickness is determined mm according to customer requirements;
W3---finish rolling exit thickness, the belt steel thickness of calibrator actual measurement, mm;
H2---roughing exit thickness-finish rolling target thickness, mm.
Preferably, the maximum effectively lateral pressure amount Wf of described step 3) is an empirical parameter, gets 3-5mm.
Preferably, the computing formula of the roughing export goal width RET of described step 4) is:
RET=Rm* (FET-FS+Wf+WC), in the formula:
RET---roughing target width, mm;
Rm---roughing target width coefficient of heredity, empirical parameter, span 0.9-1.1;
The correction of WC---roughing target width system, span [10mm, 10mm].
Preferably, the computing formula of the multi-pass natural width spread α of described step 5) is:
In the formula: α---roughing natural width spread, mm;
W
0---entrance side strip width, mm;
W
1---outlet side strip width, mm;
H
0---entrance side belt steel thickness, mm;
R---edger roll roller diameter, mm.
Preferably, the computing formula of the multi-pass overall reduction RW of described step 6) is:
RW=RIAT-REAT, in the formula:
RW---roughing 2# frame multi-pass overall reduction, mm;
RIAT---roughing 2# frame inlet is measured width, mm;
Width, mm are measured in the outlet of REAT---roughing 2# frame.
Preferably, the computing formula of the slab target width WB of described step 7) is:
WB=RET+RW-α, in the formula:
WB---slab target width, mm.
Preferably, in the described step 8), four roller reversible roughing 2# frames adopt five passages, and wherein the 3rd percentage pass reduction is 20-30%, and four-pass is that 0, the five passage is 70-80%.
The present invention makes it compared with prior art owing to adopted above technical scheme, has the following advantages and good effect: improve by the side pressure control to rolling line, guaranteed the quality of edges of middle band steel.Avoided stifled, effectively raised production efficiency because of the softer production ply-yarn drill that causes of band steel.And this control method operation is very simple, easy to use.
Description of drawings
Fig. 1 is the equipment simplified schematic diagram of roughing first frame of the present invention.
Fig. 2 is the equipment simplified schematic diagram of roughing second frame of the present invention.
Fig. 3 is the equipment simplified schematic diagram of finish rolling of the present invention.
Fig. 4 is the side pressure control curve map of the present invention and prior art.
Fig. 5 is a side compression machine work schematic diagram of the present invention.
Fig. 6 is a quality of edges control flow chart of the present invention.
Among the figure, 1SSP slab large lateral pressure machine, 2 four roller reversible roughing 1# frames, 3 band steel, 4 side pressure oil cylinders, 5 edger rolls, 6 roughing 2# frames, 7 finish rolling edger roll side pressure oil cylinders, 8 finish rolling edger rolls, 9 finish rolling 1# frames, 10 finish rolling 7# frames, A prior art control curve, B the present invention controls curve.
The specific embodiment
The present invention is the characteristic in conjunction with the band steel, the side pressure control scheme that has adopted back segment progressively to increase progressively, and the anti-side pressure that pushes away preceding operation of the maximum capacity of later operation realizes the control scheme that width control and strip edge portion lay equal stress on both quality and quantity.
As Fig. 1, shown in 2,3,1 slab large lateral pressure machine SSP wherein, 2 roughing 1# frames, 3 band steel, 4 side pressure oil cylinders, 5 edger rolls, 6 roughing 2# frames, 7 finish rolling edger roll side pressure oil cylinders, 8 finish rolling edger rolls, 9 finish rolling 1# frames, 10 finish rolling 7# frames.The present invention relates to concrete equipment has four roller reversible roughing mill 2# frame 6 (Fig. 2) and finish rolling edger rolls 8 (Fig. 3) of SSP slab large lateral pressure machine 1 (Fig. 1), four roller reversible roughing 1# frames 2, band edger roll.
As shown in Figure 6, concrete scheme of the present invention is as follows:
1 according to band steel finished width, determines finish rolling target width FET, and computing formula is:
FET=FDT+FT, in the formula:
FET---finish rolling target width, mm;
The FDT---finished width, mm;
The FT---additional amount is the margin of tolerance of the permission in the manufacture course of products, span 0-12mm.
2 determine finish rolling natural width spread FS, in the hot rolling horizontal frames operation of rolling, because the lateral flow of metal is except that the frictional resistance from roll, be not subjected to any other obstruction and restriction, the metal volume that is depressed the laterally amount of unrestricted spread is finish rolling natural width spread FS, and its computing formula is:
In the formula:
FS---finish rolling natural width spread, mm;
A1---process coefficient, span: 0.00-0.002;
H1---band steel target thickness;
W3---finish rolling exit thickness;
H2---roughing exit thickness-finish rolling target thickness.
3 determine finish rolling edger roll 8 maximum effectively lateral pressure amount Wf, and it is an empirical parameter, gets 3-5mm.
4 values of trying to achieve according to above-mentioned steps 1-3 draw roughing export goal width RET, and its computing formula is:
RET=Rm* (FET-FS+Wf+WC), in the formula:
RET---roughing target width, mm;
Rm---roughing target width coefficient of heredity, empirical parameter, span 0.9-1.1;
The correction of WC---roughing target width system is the manual intervention amount, span [10mm, 10mm].
The correction WC of roughing target width system is used for the deviation on the compensation equipment precision generally speaking.When the width of default is 1000mm, and the width that actual instrument is measured is when being 1005mm, the target width system correction of general employing-5mm.
5 determine roughing 2# frame 6 multi-pass natural width spread α, in the operation of rolling of roughing multi-pass, same because the lateral flow of metal is not owing to be subjected to any obstruction and restriction, and the metal volume that is depressed equally horizontal flowing freely can take place, and its computing formula is:
In the formula: α---roughing natural width spread, mm;
W
0---entrance side strip width, mm;
W
1---outlet side strip width, mm;
H
0---entrance side belt steel thickness, mm;
R---edger roll roller diameter, mm.
6 determine roughing 2# frame 6 multi-pass overall reduction RW, and its computing formula is:
RW=RIAT-REAT, in the formula:
RW----roughing 2# frame 6 multi-pass overall reductions, mm.
RIAT---roughing 2# frame 6 inlets are measured width, mm.
Width, mm are measured in 6 outlets of REAT---roughing 2# frame.
The reduction ratio that distributes each passage, one has five passages in the present embodiment;
Be assigned to each passage according to table 1, determine each percentage pass reduction of roughing 2# frame edger roll:
Table 1
| 1 passage | 2 |
3 |
4 |
5 |
| 0 | 0 | 20-30％ | 0 | 70-80％ |
Because when carrying out reverse passage, generally do not arrange side pressure, so, in this programme, do not consider the reduction ratio distribution for wherein the 4th passage.
7 values of trying to achieve according to step 4-6 draw slab target width WB, and its computing formula is:
WB=RET+RW-α, in the formula:
WB---slab target width, mm.
8 values according to slab target width WB, the lateral pressure amount of setting SSP slab large lateral pressure machine 1 is 0;
Because the band steel of present embodiment, be in (near the fusing point of hot-strip) under the condition of high temperature, the band steel dead-soft of this moment, in case when being subjected to the pressure of side direction, certain arching upward will take place in band steel broad ways, thereby directly have influence on contacting of band steel and rollgang, cause the card of band steel stifled, as shown in Figure 5.
Therefore, present embodiment has adopted the scheme of slab large lateral pressure machine 0 side pressure, with guarantee the band steel when the side pressure not with the arch steel at steel middle part.
Four roller reversible roughing mill 2# frames 6 of band edger roll adopt multi-pass to carry out back and forth rolling, to the control of the side direction drafts that relates to edger roll, totally are the method that increases gradually in the present embodiment.As shown in Figure 4, wherein A is a prior art control curve, and B controls curve for the present invention, and abscissa is a passage, and ordinate is the side pressure rate.Concrete distribution principle is referring to step 6 and table 1.
In the present embodiment, consider that producing the irregular fundamental cause of intermediate slab limit portion is owing to be with steel under the condition of high temperature, owing to be subjected to the active force of thickness direction (above-below direction), cause certain unrestricted spread taking place with steel, because the band steel is in high temperature, cause with the metal flow of steel itself comparatively active, thereby influence the generation of the irregular situation of strip edge portion, so in the consideration of present embodiment, got rid of the band steel when preceding passage is rolling, adopt the scheme of strip edge portion control, and, also considered when four-high reversing mill is rolling that temperature higher (greatly about about 1280-1300 ℃) band steel easily produces the factor of the arch steel on the cross section simultaneously in the passage of back, being controlled of going, therefore when realizing present embodiment, adopted the empty technical scheme of crossing of the first two passage.
(rolling time is late more because in the rolling influence that is subjected to rolling time of four-high reversing mill, the temperature that the band steel is relative is low more) be with the probability of the arch steel on the steel generation cross section low more, the power of side direction is more little simultaneously, the low more rule of probability of the arch steel on the cross section takes place in the band steel, so when the design present embodiment, when four-high reversing mill is rolling, adopted the first two passage sky to cross the control scheme that (the side direction roll gap is opened) back three passages progressively increase.
Finish rolling edger roll 8 adopts maximum effectively lateral pressure amount, 3-5mm (empirical parameter).
Embodiment
Band grade of steel: 008572480300
Slab thickness: 230mm, finished product thickness: 2.52mm
(this lateral pressure amount is width of plate slab mm-finished width mm to width of plate slab: 1100mm, finished width: 1085mm, lateral pressure amount: 15mm.)。
According to above-mentioned data, in concrete enforcement of the present invention, known band steel finished width is 1085mm, set 3mm according to its width additional amount, so its rolling width is pressed 1088mm control, in the side pressure of finish rolling edger roll is set, press the control of 3mm drafts, the natural width spread that calculates finish rolling is roughly 1mm, so the control of export of its roughing should be at 1090mm, in its roughing the 3rd and the 5th passage, adopted depressing of 3mm and 8mm respectively, according to the calculating of spreading of its roughing, it spreads roughly also about 1mm simultaneously, so the target width of its slab should below be the concrete parameter situation in the operation of rolling at 1100mm:
Before hot-strip is produced, according to the vertical miller before vertical miller and the finish rolling before related slab large lateral pressure machine, the roughing 2# frame, determine the control model of relevant components part, control is set as follows for slab large lateral pressure facility body:
| The head lateral pressure amount | The afterbody lateral pressure amount | The side pressure number of |
| 0 | 0 | 0 |
The setting of above-mentioned parameter according to the decision of four roller reversible roughing 1# frame export goal width, so before rolling, set the empty mistake of slab large lateral pressure machine, obtains The above results.
Secondly the control model of edger roll before the four-high reversing mill that relates to is selected, definite employing 5 passages back and forth are rolling, the side pressure of corresponding 1,3,5 passages distributed, simultaneously, the target width of setting the outlet of four-high reversing mill final pass is 1090mm, obtains following result.Specific as follows:
| The edger roll passage | 1 | 3 | 5 |
| Intermesh determination | 1105 | 1100 | 1090 |
| Roll gap reality | 1106 | 1098 | 1089 |
Adopting 15 tons roll-force (the maximum effectively roll-force that can bear) at last before to finish rolling in the control of edger roll because there is certain unrestricted spread in the band steel that the four-high reversing mill final pass exports, is 1095mm so the band steel goes out the developed width of four-high reversing mill final pass outlet.Because the embodiment that provides relates to the precision of field apparatus, though roll gap is 1091mm, because the precision of field apparatus and the influence of spring, the actual width that shuts out is 1095mm.
| Effective roll-force | 15 tons |
| Intermesh determination | 1090mm |
| Roll gap reality | 1091mm |
After adopting the present invention, make to have obtained the improvement that strengthens that from the rolling band steel of reality, the limit portion of band steel has obtained control preferably unusually, sees the following form in the irregular conditions of band steel on intermediate blank:
| Sequence number | The band grade of steel | Rolling specs | Limit portion situation |
| 1 | 8311672200 | 2.22*1082 | The limit is split＜20mm |
| 2 | 8311672500 | 2.22*1082 | The limit is split＜ |
| 3 | 8311672800 | 2.22*1082 | The limit is split＜ |
| 4 | 8311673100 | 2.22*1082 | The limit is split＜ |
| 5 | 8311673400 | 2.22*1082 | The limit is split＜ |
| 6 | 8311673700 | 2.22*1082 | The limit is split＜ |
| 7 | 8311674000 | 2.22*1082 | The limit is split＜ |
| 8 | 8311674300 | 2.22*1082 | The limit is split＜ |
| 9 | 8311674600 | 2.22*1082 | The limit is split＜ |
| 10 | 8311674900 | 2.22*1082 | The limit is split＜20mm |
Claims (2)
1. the control method of an intermediate slab quality of edges, the equipment of control comprise the four roller reversible roughing 2# frames (6) and the finish rolling edger roll (8) of slab large lateral pressure machine (1), band edger roll, it is characterized in that may further comprise the steps:
1) according to band steel finished width, determine finish rolling target width FET, the computing formula of finish rolling target width FET is:
FET=FDT+FT, in the formula:
FET---finish rolling target width, mm;
The FDT---finished width, mm;
The FT---additional amount, span 0-12mm;
2) determine finish rolling natural width spread FS, the computing formula of finish rolling natural width spread FS is:
FS---finish rolling natural width spread, mm;
A1---process coefficient, span: 0.001-0.002;
H1---band steel target thickness, mm;
W3---finish rolling exit thickness, mm;
H2---roughing exit thickness-finish rolling target thickness, mm;
3) determine the maximum effectively lateral pressure amount Wf of finish rolling edger roll (8), Wf is an empirical parameter, gets 3-5mm;
4) value of trying to achieve according to above-mentioned steps 1-3 draws roughing export goal width RET, and the computing formula of roughing export goal width RET is:
RET=Rm* (FET-FS+Wf+WC), in the formula:
RET---roughing target width, mm;
Rm---roughing target width coefficient of heredity, empirical parameter, span 0.9-1.1;
The correction of WC---roughing target width system, span [10mm, 10mm];
5) determine roughing 2# frame (6) multi-pass natural width spread α, the computing formula of multi-pass natural width spread α is:
In the formula:
α---roughing natural width spread, mm;
W
0---entrance side strip width, mm;
W
1---outlet side strip width, mm;
H
0---entrance side belt steel thickness, mm;
R---edger roll roller diameter, mm;
6) determine roughing 2# frame (6) multi-pass overall reduction RW, distribute the reduction ratio of each passage, the computing formula of multi-pass overall reduction RW is:
RW=RIAT-REAT, in the formula:
RW---roughing 2# frame multi-pass overall reduction, mm;
RIAT---roughing 2# frame inlet is measured width, mm;
Width, mm are measured in the outlet of REAT---roughing 2# frame;
7) value of trying to achieve according to step 4-6 draws slab target width WB, and the computing formula of slab target width WB is:
WB=RET+RW-α, in the formula:
WB---slab target width, mm;
8) according to the value of slab target width WB, the lateral pressure amount of setting slab large lateral pressure machine (1) is 0; The empty mistake of preceding two passages of four roller reversible roughing 2# frames (6), back percentage pass reduction increases gradually; Finish rolling edger roll (8) adopts maximum effectively lateral pressure amount.
2. the control method of intermediate slab quality of edges as claimed in claim 1, it is characterized in that: in the described step 8), four roller reversible roughing 2# frames (6) adopt five passages, and wherein the 3rd percentage pass reduction is 20-30%, four-pass is that 0, the five passage is 70-80%.
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| CN102825072B (en) * | 2011-06-17 | 2014-12-24 | 宝山钢铁股份有限公司 | Method for setting vertical roll gap by centering side guide plates, measuring width and correcting |
| CN102989780B (en) * | 2011-09-19 | 2014-12-24 | 宝山钢铁股份有限公司 | Electricity-saving control device and control method for vertical mill |
| CN103252354B (en) * | 2013-05-17 | 2015-05-06 | 山西太钢不锈钢股份有限公司 | Method for controlling side turning of hot rolling stainless steel band |
| CN103624088B (en) * | 2013-11-29 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Eliminate the method for steel plate tail transverse crack |
| CN106334715B (en) * | 2016-08-26 | 2018-09-18 | 首钢京唐钢铁联合有限责任公司 | The method for improving strip width control accuracy |
| CN108380673B (en) * | 2018-05-03 | 2019-10-29 | 河钢股份有限公司承德分公司 | Determine that roughing subtracts method, system and the terminal device of wide strategy |
| CN112439792B (en) * | 2019-08-30 | 2023-01-20 | 宝山钢铁股份有限公司 | Rough rolling width dynamic correction method based on vertical roll rolling force |
| CN113664048B (en) * | 2020-05-15 | 2023-05-09 | 宝山钢铁股份有限公司 | Method for judging and controlling side turning of strip steel during side pressing of rough rolling vertical rolls of hot continuous rolling mill |
| CN112547797B (en) * | 2020-11-23 | 2022-07-08 | 山西太钢不锈钢股份有限公司 | Comprehensive control method for width and side turning of 430 stainless steel |
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|---|---|---|---|---|
| EP1129796A2 (en) * | 1996-07-18 | 2001-09-05 | Kawasaki Steel Corporation | Rolling method and rolling mill of strip for reducing edge drop |
| CN1642667A (en) * | 2002-03-15 | 2005-07-20 | 西门子公司 | Computer-aided method for determing desired values for controlling elements of profile and surface evenness |
| CN1485156A (en) * | 2002-09-28 | 2004-03-31 | 鞍钢集团新钢铁有限责任公司 | Hot-rolled strip steel moderate sea profile shape controlling method |
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