CN103203370A - Edge wave control method aiming at high-strength steel and work rollers thereof - Google Patents
Edge wave control method aiming at high-strength steel and work rollers thereof Download PDFInfo
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- CN103203370A CN103203370A CN2012100090136A CN201210009013A CN103203370A CN 103203370 A CN103203370 A CN 103203370A CN 2012100090136 A CN2012100090136 A CN 2012100090136A CN 201210009013 A CN201210009013 A CN 201210009013A CN 103203370 A CN103203370 A CN 103203370A
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Abstract
The invention relates to an edge wave control method aiming at high-strength steel and work rollers thereof. The method comprises the steps of (a) machining and maintaining a continuously changed axisymmetric roll-shaped curved face at the circumferential face of each work roller, and (b) enabling the no-load roller seam between the upper and lower rollers to be continuously changed to negative convexity from zero convexity, and the length of the contact line between the upper and lower work rollers and an adjacent support roller to be reduced when the upper and lower rollers in antisymmetry arrangement are oppositely shifted along the axial direction, wherein the roller shapes of the work rollers are approximately axisymmetric vase-shaped, and the roller curves of the vase-shaped work rollers at least comprise a section of continuous waved curve consisting of a group of crests and troughs. According to the method and the work rollers thereof, both the no-load roller seam shape and the inter-roller contact line length are changed during the process that the upper and lower rollers are oppositely shifted along the axial direction, thus increasing the transverse rigidity of a rolling mill by roller shifting, achieving higher convexity control capacity and realizing the control over the edge wave during the panel-strip rolling.
Description
Technical field
The present invention relates to a kind of steel rolling process/plate shape control technology, the working roll/intermediate calender rolls that relates in particular to a kind of limit wave control method at high-strength steel and be used for realizing this limit wave control method.
Background technology
The strip material plays important effect as one of most important product of steel and iron industry in the national economic development.It has extremely widely in industry, agricultural, national defence and daily life uses.Along with developing rapidly of modern industry and science and technology, the users of industrial enterprise have proposed more and more stricter requirement to the plate quality of strip.
Plate shape is one of most important quality index of strip material, for solving cold rolled sheet shape control problem, tens kinds of plate shape control technologys and special mill type have successively appearred, for example CVC, HC/UC, SmartCrown, DSR, UPC, VC, VCL etc., wherein with CVC and these two kinds of roll shifting milling trains of HC/UC worldwide use the most extensive, also obtained comparatively good plate shape control effect.
But, board rolling practice at present shows, along with users such as automobile, building are growing to the demand of high-strength steel, super-high strength steel, at present the cold-rolled steel strip products strength range constantly enlarges (200MPa～1500MPa), belt steel thickness further reduces, roll-force further increases, above-mentioned 2 cause increasing greatly with the plate shape control difficulty of steel, and limit wave defective very easily appears in on-the-spot actual production.Yet the user requires that raising has by a relatively large margin but been arranged (be example with tame electroplax, unrestrained high request is by bringing up to less than 2mm less than 2.5mm, and increase rate reaches 20%) to strip shape quality in recent years.This has proposed new, arduous challenge more just for the plate shape control of cold-strip steel.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of limit wave control method at high-strength steel, to strengthen the control ability of milling train opposite side wave, make milling train can satisfy the requirement of high rigidity when producing high-strength steel, improve the strip shape quality that rolls back band steel, its technical problem to be solved can be implemented by the following technical programs.
A kind of limit wave control method at high-strength steel comprises:
(a), process continually varying axial symmetry roll forming curved surface at the periphery of working roll/intermediate calender rolls, and keep
When (b), being upper and lower working roll/intermediate calender rolls that antisymmetry arranges vertically from play, unloaded roll gap between upper and lower working roll/intermediate calender rolls is changed to negative convexity gradually by zero convexity, and the contact line length of upper and lower working roll/intermediate calender rolls and adjacent support roller reduces.
Further improvement as the technical program, be upper and lower working roll that antisymmetry arranges vertically during close play, unloaded roll gap between upper and lower working roll/intermediate calender rolls is changed to positive convexity gradually by zero convexity, and the contact line length of upper and lower working roll/intermediate calender rolls and adjacent support roller is constant.
Another technical problem to be solved by this invention is to provide a kind of working roll/intermediate calender rolls of realizing above-mentioned limit wave control method; In order to solve the problems of the technologies described above, the present invention adopts following technical scheme.
A kind of cold roll/intermediate calender rolls at high-strength steel, the roll forming of this working roll/intermediate calender rolls be axisymmetricly vase-shaped roughly, and the roll shape curve of this vase-shaped working roll/intermediate calender rolls comprises one section continuous waveform curve that contains one group of crest and trough at least.
As the further improvement of this technical scheme, the axial cross section of described working roll/intermediate calender rolls roughly is fish shape.
As one of the preferred embodiments of the present invention, the roller length of described working roll/intermediate calender rolls exceeds 5%～10% of adjacent support roller roller length.
Also as the further improvement of this technical scheme, exceed part and be the fish tail end of described fish shape working roll/intermediate calender rolls.
In addition, can be provided with circular arc chamfering at the fish tail end of described fish shape working roll/intermediate calender rolls, the chamfering width of described circular arc chamfering is 3%～6% of roll length.
Also as the further improvement of this technical scheme, the one group of described working roll/intermediate calender rolls that is the antisymmetry layout has formed top working roll/intermediate calender rolls and bottom working roll/intermediate calender rolls respectively, when the head of upper and lower working roll/intermediate calender rolls kept concordant with the end of adjacent support roller respectively, the crest of the corresponding waveform curve of described top working roll/intermediate calender rolls and trough trough and the crest of corresponding waveform curve with described bottom working roll/intermediate calender rolls respectively were corresponding; And to name upper and lower working roll/intermediate calender rolls under this state and the relative position of adjacent each support roller be initial bit.
Further, each intersegmental roll gap aperture (width) of the upper and lower working roll/intermediate calender rolls under the described initial bit equates.
In addition, when described upper and lower working roll/intermediate calender rolls vertically from described initial bit mutually near the time, the trough of the corresponding waveform curve of described upper and lower working roll/intermediate calender rolls is close mutually, it is big that the roll gap aperture of the relative initial bit of roll gap aperture that forms between two troughs becomes; When described upper and lower working roll/intermediate calender rolls vertically from described initial bit mutually away from the time, the crest of the corresponding waveform curve of described upper and lower working roll/intermediate calender rolls is close mutually, the roll gap aperture of the relative initial bit of roll gap aperture that forms between two crests diminishes.
Adopt limit wave control method and the working roll thereof at high-strength steel of technique scheme, exactly by both having changed unloaded roll gap shape in the play process and change simultaneously and contact line length between roller axial at upper and lower roll, the lateral stiffness that makes roll shifting both increase milling train also has simultaneously stronger convexity control ability, and then the limit wave control problem when realizing plate sheet and strip.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention being done one describes in detail.
Fig. 1 is SFR roll forming structural representation of the present invention;
Fig. 2 is SFR technology roll roller system's layout of the present invention and operation principle thereof; Wherein Fig. 2 a represents zero convexity state; Fig. 2 b represents negative convexity state; Fig. 2 c represents positive convexity state;
Fig. 3 is that the carrying roll gap convexity of SFR technology in the embodiment of the invention is regulated the territory;
Fig. 4 presses the power distribution indirectly for the roller of SFR technology in the embodiment of the invention;
Fig. 5 is the carrying roll gap lateral stiffness of SFR roll forming in the embodiment of the invention;
Fig. 6 adopts the preceding 1# frame exit plate shape of SFR technology in the embodiment of the invention;
Fig. 7 adopts 1# frame exit plate shape after the SFR technology in the embodiment of the invention;
Strip Elongation Distribution: band steel percentage elongation distributes
Strip Shift: strip width
I-Uint: relative elongation is poor, 1I-Unit=10 (μ m/m)
---support roller 210---top working roll 220---bottom working roll 211,221---fish tail 212,222---fish 213,223---crest 214,224---trough 230---roll gap a 300---band steel among the figure: 110,120
The specific embodiment
The present invention proposes a kind of limit wave control method at high-strength steel, called after SFR (high stiffness and large flexible roll) technology.
Fig. 2 has illustrated upper and lower working roll 210 and 220 vertically during play, the variable condition of roll gap 230, wherein (Fig. 2 is a) when changing to negative convexity (Fig. 2 b) by zero convexity, upper working rolls and lower working rolls is done from play, at this moment, the crest 213 of top working roll 210 acts on band steel 300 jointly with the crest 223 of bottom working roll 220, and the roll gap 230 between the crest 213 and 223 diminishes with respect to Fig. 2 a, the suffered roll-force narrowing toward each end broad in the middle of band steel; And when (Fig. 2 is during a) to positive convexity (Fig. 2 c) transition by zero convexity, upper working rolls and lower working rolls is made play in opposite directions, at this moment, the trough 214 of top working roll 210 acts on band steel 300 jointly with the trough 224 of bottom working roll 220, roll gap 230 between the trough 214 and 224 becomes big with respect to Fig. 2 a, is with the middle little both sides of the suffered roll-force of steel big.
Can move axially the special roll shape curve that Roller Machining goes out, change simultaneously and contact line length (reduce harmful contact zone) between roller in the play process, both having changed unloaded roll gap shape at roll mandrel, thereby strengthen the limit wave control ability of milling train,
This control method has following characteristics:
1) can have antisymmetric roll shape curve by axially movable SFR roll.
The SFR roll forming need guarantee following 3 points:
(1) the SFR roll has the continually varying roll shape curve in barrel length, namely as shown in Figure 1, roll shape curve and vase shape are similar, wherein the fish tail end has circular arc chamfering, chamfering length and milling train size, to produce band steel specification relevant, be about 3%～6% of roll length, arc radius is relevant with the milling train size.The roll forming antisymmetry of upper and lower working roll/intermediate calender rolls is arranged.
(2) when the SFR roller does not have play (being in initial zero-bit), SFR roll forming fish head end roll forming starting point is concordant with support roller limit portion, SFR roll forming fish tail end roll forming terminal point is than support roller extend outwards one segment distance, this is to be given as 5%～10% of support roller length apart from the length people, both distance shown in W among Fig. 1.
(3) in SFR roll play process, the roll gap convexity can change continuously.There are essential distinction in this point and HC/UC technology.
2) the SFR edge is mutually away from the direction symmetry moving process, (the roll gap mid span is little to negative convexity gradually by zero convexity (broad ways roll gap aperture is identical) for unloaded roll gap, both sides are big) change, the contact line length of SFR roller and support roller reduces simultaneously, thereby guarantee that the band steel is had stronger limit wave control ability, avoided cold-rolled plate and strip limit wave defective to occur, milling train has stronger lateral stiffness simultaneously, as shown in Figure 2 (be example with four roller SFR).At different strip widths, the SFR technology adopts different roll shifting amounts to reach good plate shape control effect.
SFR roller play need guarantee following some:
(1) when the SFR roller does not have play, SFR roller and support roller contact line length are support roller length, shown in Fig. 2 a (be example with four roller SFR).
(2) when the SFR roller in mutually away from the direction moving process, SFR roller and support roller contact line length are changed to Fig. 2 b less than support roller length by Fig. 2 a, this moment, roll gap shape was changed to negative convexity continuously by zero convexity, defining this process is to bear to scurry.
(3) in the mutual direction of closing moving process in SFR roller edge, SFR roller and support roller contact line length are support roller length and remain unchanged, and are changed to Fig. 2 c by Fig. 2 a, and this moment, roll gap shape was changed to positive convexity continuously by zero convexity, defined this process for just scurrying.
For the superiority of SFR technology is described theoretically, at certain company's 1420 cold continuous rolling, use finite element software to carry out simulation calculation, the SFR technology has been carried out simulation analysis.
Estimate a kind of plate shape control technology and type and need press two aspect evaluations of power distribution indirectly from plate shape control ability and the roller of milling train.Wherein the plate shape control ability of milling train is core, comprises that the convexity of milling train is regulated territory and lateral stiffness, and the former has determined the plate shape modification scope of milling train, and the latter represents the ability of milling train opposing roll-force fluctuation.Fig. 3 is that the carrying roll gap convexity of SFR technology is regulated the territory.Fig. 4 is the horizontal rigidity of carrying roll gap of SFR technology.
Roller presses the power distribution indirectly and comprises two contents: uniformity and roller that roller presses the power distribution indirectly press the power peak value indirectly.The former influence roll mandrel to uneven wear, the latter influences peeling off of roll.Fig. 5 is that the roller of SFR technology presses the power analysis indirectly.
When making roll gap by zero convexity during to negative convexity variation by moving axially, the unloaded roll gap of SFR roll is negative convexity, and the axial contact length of SFR roll and adjacent contact roller reduces simultaneously, and further increasing has the negative convexity degree of carrying roll gap, strengthen the plate shape control ability of milling train
When by moving axially when roll gap is changed to positive convexity by zero convexity, the axial contact length of SFR roll and adjacent contact roller remains unchanged.
The present invention has than the bigger convexity regulating power of HC/UC technology, and plate shape adjustable range is bigger; Have the roll gap lateral stiffness bigger than CVC technology, have the ability of stronger opposing roll-force fluctuation.
The machine test on the C202 of certain rolling mill production line unit first frame of the limit wave control method that relates in the technical program and working roll thereof, first three frame of this milling train is 4 roller CVC types, 2 frames in back are 6 roller CVC types, and wherein a plate profile instrument respectively is equipped with in the outlet of first frame and the outlet of the 5th frame.By grinding SFR roll forming on a pair of approaching working roll of scrapping, can enough realize every function of SFR technology, mainly be to reach following two purposes in the play process in working roll axial: 1. contact line length between the roller of working roll and support roller and reduce; 2. axial time carrying roll gap shape changes to negative convexity working roll from play.
Carry out when unit is produced certain trade mark high-strength steel cold rolled automobile sheet during test, this steel grade 1# frame outlet belt plate shape before using the SFR technology shows as big bilateral limit wave, as shown in Figure 6.When using the SFR technology to test, working roll roll shifting amount is set at the negative 70mm that scurries according to strip width, the contact line length has reduced 70mm between roller, increasing the milling train lateral stiffness simultaneously because the existence of shape of working roll, further strengthen milling train and had stronger limit wave control ability, the 1# frame exports this steel grade belt plate shape obviously to be improved, and the limit wave obviously reduces, as shown in Figure 7.
Technology provided by the present invention can be used for cold rolling unit newly-built or reconstruction, and equipment complexity, difficulty of construction and cost and CVC milling train are suitable with the UC milling train.Can apply to have the roll mandrel upgrading of shifting function milling train sidelong in addition, as CVC milling train, SmartCrown etc., by using roll shifting mode and the SFR roll forming of SFR technology, finally reach and strengthen milling train plate shape control ability, improve the purpose of belt plate shape quality, have broad application prospects.
Claims (10)
1. one kind at the limit of high-strength steel wave control method, comprising:
(a), process continually varying axial symmetry roll forming curved surface at the periphery of working roll/intermediate calender rolls, and keep
When (b), being upper and lower working roll/intermediate calender rolls that antisymmetry arranges vertically from play, unloaded roll gap between upper and lower working roll/intermediate calender rolls is changed to negative convexity gradually by zero convexity, and the contact line length of upper and lower working roll/intermediate calender rolls and adjacent support roller reduces.
2. according to the described limit wave control method at high-strength steel of claim 1, it is characterized in that, be upper and lower working roll that antisymmetry arranges vertically during close play, unloaded roll gap between upper and lower working roll/intermediate calender rolls is changed to positive convexity gradually by zero convexity, and the contact line length of upper and lower working roll/intermediate calender rolls and adjacent support roller is constant.
3. working roll/intermediate calender rolls that is applied in claim 1 or the 2 described limits wave control methods, it is characterized in that, the roll forming of this working roll/intermediate calender rolls is axisymmetricly vase-shaped roughly, and the roll shape curve of this vase-shaped working roll/intermediate calender rolls comprises one section continuous waveform curve at least.
4. working roll/intermediate calender rolls according to claim 3 is characterized in that, the axial cross section of described working roll/intermediate calender rolls roughly is fish shape.
5. working roll/intermediate calender rolls according to claim 4 is characterized in that, the roller length of described working roll/intermediate calender rolls exceeds 5%～10% of adjacent support roller roller length.
6. working roll/intermediate calender rolls according to claim 5 is characterized in that, exceeds part and is the fish tail end of described fish shape working roll/intermediate calender rolls.
7. according to claim 4,5 or 6 described working roll/intermediate calender rolls, it is characterized in that the fish tail end of described fish shape working roll/intermediate calender rolls is provided with circular arc chamfering, the chamfering width of described circular arc chamfering is 3%～6% of roll length.
8. working roll/intermediate calender rolls according to claim 3, it is characterized in that, the one group of described working roll/intermediate calender rolls that is the antisymmetry layout has formed top working roll/intermediate calender rolls and bottom working roll/intermediate calender rolls respectively, when the head of upper and lower working roll/intermediate calender rolls kept concordant with the end of adjacent support roller respectively, the crest of the corresponding waveform curve of described top working roll/intermediate calender rolls and trough trough and the crest of corresponding waveform curve with described bottom working roll/intermediate calender rolls respectively were corresponding; And to name upper and lower working roll/intermediate calender rolls under this state and the relative position of adjacent each support roller be initial bit.
9. working roll/intermediate calender rolls according to claim 8 is characterized in that, each intersegmental roll gap aperture of the upper and lower working roll/intermediate calender rolls under the described initial bit equates.
10. according to Claim 8 or 9 described working roll/intermediate calender rolls, it is characterized in that, described upper and lower working roll/intermediate calender rolls is vertically when described initial bit is close mutually, the trough of the corresponding waveform curve of described upper and lower working roll/intermediate calender rolls is close mutually, and it is big that the roll gap aperture of the relative initial bit of roll gap aperture that forms between two troughs becomes; Described upper and lower working roll/intermediate calender rolls vertically from described initial bit mutually away from the time, the crest of the corresponding waveform curve of described upper and lower working roll/intermediate calender rolls is close mutually, the roll gap aperture of the relative initial bit of roll gap aperture that forms between two crests diminishes.
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| CN2012100090136A CN103203370A (en) | 2012-01-12 | 2012-01-12 | Edge wave control method aiming at high-strength steel and work rollers thereof |
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| CN2012100090136A CN103203370A (en) | 2012-01-12 | 2012-01-12 | Edge wave control method aiming at high-strength steel and work rollers thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103707543A (en) * | 2014-01-15 | 2014-04-09 | 秦树南 | Step-shaped burr roller for production device of flexible graphite coiled material with width of 1.5m |
| CN103736735A (en) * | 2013-12-25 | 2014-04-23 | 烨辉（中国）科技材料有限公司 | Intermediate roller for cold-roll steel sheet |
| CN104550236A (en) * | 2015-01-07 | 2015-04-29 | 王乐 | Cold rolling process capable of preventing broken edge wave defect of ultrathin steel strip |
| CN106111708A (en) * | 2016-05-05 | 2016-11-16 | 首钢京唐钢铁联合有限责任公司 | Method for reducing edge drop of tinning plate |
| WO2017215595A1 (en) * | 2016-06-15 | 2017-12-21 | Rizhao Baohua New Material Co., Ltd. | Mill rolls capable of rolling long kilometres for esp production line |
| CN112476070A (en) * | 2020-12-02 | 2021-03-12 | 广西钢铁集团有限公司 | Grinding method for changing right angle of end part of roller into arc chamfer |
| CN114769326A (en) * | 2022-03-25 | 2022-07-22 | 北京首钢股份有限公司 | Hot rolling roll gap contour construction method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736735A (en) * | 2013-12-25 | 2014-04-23 | 烨辉（中国）科技材料有限公司 | Intermediate roller for cold-roll steel sheet |
| CN103707543A (en) * | 2014-01-15 | 2014-04-09 | 秦树南 | Step-shaped burr roller for production device of flexible graphite coiled material with width of 1.5m |
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| CN104550236A (en) * | 2015-01-07 | 2015-04-29 | 王乐 | Cold rolling process capable of preventing broken edge wave defect of ultrathin steel strip |
| CN106111708A (en) * | 2016-05-05 | 2016-11-16 | 首钢京唐钢铁联合有限责任公司 | Method for reducing edge drop of tinning plate |
| WO2017215595A1 (en) * | 2016-06-15 | 2017-12-21 | Rizhao Baohua New Material Co., Ltd. | Mill rolls capable of rolling long kilometres for esp production line |
| US11059083B2 (en) | 2016-06-15 | 2021-07-13 | Arvedi Steel Engineering S.P.A. | Mill rolls capable of rolling long kilometers for ESP production line |
| CN112476070A (en) * | 2020-12-02 | 2021-03-12 | 广西钢铁集团有限公司 | Grinding method for changing right angle of end part of roller into arc chamfer |
| CN112476070B (en) * | 2020-12-02 | 2022-10-11 | 广西钢铁集团有限公司 | Grinding method for changing right angle of roller end into arc chamfer |
| CN114769326A (en) * | 2022-03-25 | 2022-07-22 | 北京首钢股份有限公司 | Hot rolling roll gap contour construction method and system |
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Application publication date: 20130717 |