CN101693265B - Method and device for adjusting strip steel transverse warping by using pinch rolls - Google Patents
Method and device for adjusting strip steel transverse warping by using pinch rolls Download PDFInfo
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- CN101693265B CN101693265B CN2009102111224A CN200910211122A CN101693265B CN 101693265 B CN101693265 B CN 101693265B CN 2009102111224 A CN2009102111224 A CN 2009102111224A CN 200910211122 A CN200910211122 A CN 200910211122A CN 101693265 B CN101693265 B CN 101693265B
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- roll
- pinch roll
- pinch
- convexity
- transverse warping
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Abstract
Disclosed is a method for adjusting strip steel transverse warping by using pinch rolls. The method can eliminate defect of transverse warping produced in actual production by optimizing roll shapes of the pinch rolls. Two pairs of pinch rolls in different roll shapes are arranged on a coiling machine; central lines of the two pairs of pinch rolls are in the same straight line; one pair of the pinch rolls 1 is disposed in front of the coiling machine and employs roll shape that an upper roll has positive convexity degree and a lower roll has no convexity degree; and the other pair of the pinch rolls 3 is disposed in the rear of the coiling machine and adopts the roll shape that an upper roll has positive convexity degree and a lower roll has negative convexity degree. When requirements onshapes of strip steels are not too high or transverse warping is not serious, the pinch rolls 1 work; when the transverse warping is serious, the pinch rolls 3 can work. Roll shape curves employ a second power function, and parabola of the second power function is determined according to transverse warping values in actual production. Accordingly, transverse warping defect is eliminated or minimized to an allowable range through the reverse regulation.
Description
Technical field
The present invention relates to the hot continuous rolling process of metallurgy industry band steel, especially relate to the method that the pinch roll apparatus of the downcoiler that utilizes the hot strip rolling line is controlled Hot Strip shape.
Background technology
Band steel interior temperature distribution in the laminar flow process is inhomogeneous and the thermal stress and the transformation stress that produce make the band steel transversely exist bigger residual stress, thereby cause being with the horizontal unstability of steel, bend, bending direction is to arch upward in the centre, and two ends are downward, produces the band strip steel transverse warping.
The band strip steel transverse warping is a problem that generally occurs during hot-strip is produced, and this defective not only influences the plate shape of hot-strip, also can produce many adverse effects to cold rolling sour rolling line.As the rubber roll of pickling section, because the limit portion of band steel contacts with rubber roll is local, increased the wearing and tearing of rubber roll, shortened the service life of rubber roll greatly.All can there be similar problem in roller such as slewing rollers, idler roller.In addition, also affect for subsequent technique.
At present, being used to adjust cupped method has:
1 improves the uniformity that thickness direction cools off: the spray angle of nozzle is to increase current at the time of staying of steel plate lower surface and the injection flow rate of increase steel plate lower surface under changing, and the latter is main and effective method.Water yield ratio will be decided on Total Water up and down, and Total Water is big more, and the ratio of the following water yield, the last water yield is more little.
2 improve the uniformity of width cooling: top nozzle adopts horizontal inhomogeneous water distribution, adopts the water distribution of camber as water curtain; Following nozzle improves spray angle; Simultaneously top nozzle and following nozzle are adopted horizontal means for screening.
3 adopt little limit wave and little middle wave control.Warpage is because limit portion and mid portion produce different cooling amounts of contraction, adopt little limit wave or little in wave can the compensate for shrinkage amount difference.
Because production technology (as going out finishing mill temperature, coiling temperature) is ripe, changes tissue and performance that existing processes can influence the band steel, thereby influences the plate quality of strip.To change existing cooling device be an expense height, the long engineering that expends time in, because influence factor is more, generates cupped mechanism complexity simultaneously, adopts the method effect that changes band steel process for cooling and cooling device and not obvious.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide a kind of method of utilizing hydraulic pressure pinch roll inhibition zone strip steel transverse warping.By optimizing the pinch roll roll forming, the reverse cupping of accommodation zone steel reduces or eliminates cupped purpose thereby reach.
Another object of the present invention is by optimizing the pinch roll roll forming, a kind of cupped coiling machine of reverse accommodation zone steel being provided.Prioritization scheme is the roll forming according to bottom pinch roll on the cupping design coiling machine that occurs in the production process, and select corresponding roll forming according to the cupping value, utilize corresponding roll forming that the band steel of different cupping values is oppositely regulated, eliminate the cupping defective or warpage is reduced to the scope of permission.This prioritization scheme adopts two kinds of forms:
First kind of form is to adopt the roll forming that convexity is arranged in the 1m scope of pinch roll top roll middle part, adopts the cylinder roll forming of no convexity in the 1m scope of lower roll middle part, and the top roll roll shape curve is the secondary power function, and in the coordinate system as shown in Figure 1, parabolic equation is y=ax
2+ c, in the formula, a=-4l, c=R+l, wherein R is the radius of top roll, and l is the cupping mean value of measured band steel, and x, y adopt the International System of Units.
Second kind of form is to adopt the roll forming that convexity is arranged in the 1m scope of pinch roll top roll middle part, adopts the roll forming of recessed song in the 1m scope of lower roll middle part, and roll shape curve is the secondary power function, and in the coordinate system as shown in Figure 2, the top roll parabolic equation is y
1=a
1x
2+ c
1, the lower roll parabolic equation is y
2=a
2x
2+ c
2, in the formula, a
1=-4l, c
1=R+l, a
2=4l, c
2=r-l, wherein R is the radius of top roll, and r is the radius of lower roll, and l is the cupping mean value of measured band steel, and x, y adopt the International System of Units.
In order to cooperate the use of pinch roll, coiling machine is provided with two pairs of pinch rolls and two winding drum, and two pairs of pinch roll center lines point-blank.In the strip coiling process, select wherein a pair of pinch roll for use according to cupping value and actual production technology.
The present invention also proposes a kind of device that utilizes pinch roll adjustment band strip steel transverse warping, comprise pinch roll and reel, on the width of described pinch roll in the 1m scope of middle part, its top roll has positive convexity, lower roll that negative convexity is arranged, roll shape curve is the secondary power function, and the top roll parabolic equation is y
1=a
1x
2+ c
1, the lower roll parabolic equation is y
2=a
2x
2+ c
2, parameter a
1=-4l, c
1=R+l, a
2=4l, c
2=r-l, wherein R is the radius of top roll, l is the cupping mean value of measured band steel.
Described pinch roll lower roll also can adopt the cylinder roll forming of no convexity.
Described top pinch roll roller footpath is greater than bottom pinch roll roller footpath, and last bottom pinch roll laterally closes on setting, and top pinch roll is offset certain distance L with respect to bottom pinch roll to band steel direction of advance.
Two pairs of differential roller shape pinch rolls are set on described coiling machine simultaneously and are equipped with corresponding two reels, two pairs of pinch roll center lines when batching, are selected the pinch roll of different roll formings point-blank according to the difference of cupping size.
Round-corner transition is adopted with the cambered surface intersection that convexity or concavity are arranged in the described pinch roll face of cylinder, and radius of corner is 30mm.
Not only simple, the realization easily of the present invention, and regulating effect is obvious, is applicable to the cupping that different reasons produce.Simultaneously, the process for cooling of being with steel is had no effect, can not influence the quality of band steel.It is the very strong method of a kind of practicality.
Description of drawings
Fig. 1 is that top roll is that positive convexity, lower roll are the pinch roll roll forming schematic diagram of no convexity;
Fig. 2 is that top roll is that positive convexity, lower roll are for bearing the pinch roll roll forming schematic diagram of convexity;
The spooler sketch of Fig. 3 for adopting;
Fig. 4 is the side view that batches when not working with pinch roll;
Fig. 5 is the side view that batches in the time of will depressing with steel with the top pinch roll of pinch roll.
The specific embodiment
Conjunction with figs. describes the method and the device of adjustment band strip steel transverse warping of the present invention in detail.Wherein, Fig. 1 is that top roll is that positive convexity, lower roll are the pinch roll 1 roll forming schematic diagram of no convexity.As shown in the figure, lower roll adopts the cylindrical life-span that helps improving lower roll of no convexity, in coiling process, helps being with steel to pass pinch roll 1 simultaneously, enters pinch roll 3.
Fig. 2 is that top roll is that positive convexity, lower roll are for bearing the pinch roll 3 roll forming key diagrams of convexity.This pinch roll has the roll gap of carrying to be parabola shaped, and parabolical opening direction is opposite with the opening direction of band strip steel transverse warping, and pinch roll 3 adjusting cupping abilities are strong, are suitable for the serious band steel of cupping.
According to the cupping value of measuring, design pinch roll roll forming, roll shape curve is the secondary power function, and the roll forming of pinch roll realizes that by grinding roller for ease of grinding roller, round-corner transition is adopted with the cambered surface intersection that convexity or concavity are arranged in the face of cylinder, and radius of corner is 30mm.
The spooler sketch of Fig. 3 for adopting.As shown in Figure 3, coiling machine has two cover pinch roll and two reels, according to the size of band strip steel transverse warping and to the requirement of belt plate shape, selects corresponding pinch roll and reel.Place pinch roll 1 and pinch roll 2 front and back, and two roller center lines are at straight line.It is the roll forming of no convexity that pinch roll 1 adopts top roll 1a that positive convexity, lower roll 1b are arranged.Pinch roll 3 adopts top roll 3a positive convexity, lower roll 3b to be arranged for bearing the roll forming of convexity.When band strip steel transverse warping value was big, pinch roll 1 top roll was not worked, and the band steel passes from pinch roll 1, arrives pinch roll 3, nipped behind the band steel, and pinch roll 3 top rolls are depressed.To be with steel guiding reel 4, and cupping will be regulated.When band strip steel transverse warping value hour, pinch roll 1 work is nipped behind the band steel, pinch roll 1 top roll is depressed.To be with steel guiding reel 2, and cupping will be regulated.
Because the band strip steel transverse warping is with the steel influence of specification very big, the band steel is thin more, and the cupping value is big more.For ease of the actual production operation, adopting pinch roll 1 in batching still is pinch roll 3, generally selects with band steel specification.Less than the strip steel of 3.5mm thickness,, adopt pinch roll 3 because cupping is bigger.Band steel greater than 3.5mm thickness adopts pinch roll 1 to batch.
Because specific symmetrical curve is adopted at the pinch roll middle part, the centering of band steel seems particularly important when entering pinch roll.When being with steel, its centering is led by the adjustable flipper guide before the coiling machine near coiling machine.Flipper guide is a hydraulic regulation, batches effect to guarantee the best, avoids strip edge portion to damage.
Top pinch roll should be with respect to bottom pinch roll to band steel direction of advance skew certain distance L, and as shown in Figure 4, the band steel so that pinch roll can be nipped smoothly makes band steel toe portion be bent downwardly and successfully enter reel and help winding up roller to batch along the guide plate direction.When L reduced, pinch roll weakened the degree of crook of band steel.During work, under the effect of pressure P, top pinch roll will be with steel to depress.Bottom pinch roll need not to drive.As shown in Figure 5.In transport process, the band strip steel transverse warping has been carried out reverse adjusting.
The task of pinch roll be guidance tape steel toe portion enter coiling machine and and a band steel moved to mandrel, simultaneously, in the process of transmission, cupping is oppositely exerted pressure, by this reverse adjusting, reduce even eliminate cupping.When the beginning of the program of batching, the transmission of pinch roll is speed control.When the band steel enters coiling machine, and and after last frame of finishing mill forms tension force, the pinch roll transmission is torque control.Under this state, the tension force between band steel and the finishing mill can be controlled.In the very short time after the band steel is about to leave the finishing mill last stand, pinch roll unit must remove whole tension force, so that the band steel does not leave last rolling mill of finishing mill with having tension force.
In order to make the band steel that has the cupping defective enter pinch roll smoothly, the roll gap between the last bottom pinch roll will be adjusted according to the reference by location value of using the closed loop Position Control.In case system discovery band steel toe portion enters pinch roll, will be transformed into pressure control mode by position control mode.Pressure control be provided at rolling during with the function of rated pressure compressive zone steel afterbody.After band steel afterbody left pinch roll, system was converted back to Position Control automatically with control model.Top pinch roll adopts hydraulic regulation.
Claims (9)
1. method of utilizing pinch roll adjustment band strip steel transverse warping is characterized in that:
Roll forming according to bottom pinch roll on the cupping design coiling machine that occurs in the production process, and select corresponding roll forming according to the cupping value, utilize corresponding roll forming that the band steel of different cupping values is oppositely regulated, eliminate the cupping defective or warpage is reduced to the scope of permission;
Described design of going up the roll forming of bottom pinch roll is adopted on width, top roll has positive convexity, lower roll that the pinch roll of negative convexity is arranged, the pinch roll top roll adopts the roll forming that convexity is arranged in the 1m scope of middle part, the pinch roll lower roll adopts the roll forming of recessed song in the 1m scope of middle part, roll shape curve is the secondary power function, and the top roll parabolic equation is y
1=a
1x
2+ c
1, the lower roll parabolic equation is y
2=a
2x
2+ c
2Parameter a
1=-4l, c
1=R+l, a
2=4l, c
2=r-l, wherein R is the radius of top roll, and r is the radius of lower roll, and l is the cupping mean value of measured band steel.
2. the method for utilizing pinch roll adjustment band strip steel transverse warping according to claim 1 is characterized in that:
Described pinch roll lower roll will have the roll forming of convexity to replace with the cylinder roll forming of no convexity in the 1m scope of middle part.
3. the method for utilizing pinch roll adjustment band strip steel transverse warping according to claim 1 and 2 is characterized in that:
Top pinch roll roller footpath is set greater than bottom pinch roll roller footpath, last bottom pinch roll laterally closes on setting, top pinch roll should be with respect to bottom pinch roll to band steel direction of advance skew certain distance L, so that the pinch roll band steel of can nipping smoothly when depressing makes band steel toe portion be bent downwardly and successfully enter reel and help winding up roller to batch along the guide plate direction.
4. the method for utilizing pinch roll adjustment band strip steel transverse warping according to claim 3, it is characterized in that: two pairs of differential roller shape pinch rolls are set on described coiling machine simultaneously and are equipped with corresponding two reels, two pairs of pinch roll center lines point-blank, when batching, select the pinch roll of different roll formings according to the difference of cupping size.
5. a device that utilizes pinch roll adjustment band strip steel transverse warping comprises pinch roll and reel, it is characterized in that:
On the width of described pinch roll in the 1m scope of middle part, its top roll has positive convexity, lower roll that negative convexity is arranged, and roll shape curve is the secondary power function, and the top roll parabolic equation is y
1=a
1x
2+ c
1, the lower roll parabolic equation is y
2=a
2x
2+ c
2, parameter a
1=-4l, c
1=R+l, a
2=4l, c
2=r-l, wherein R is the radius of top roll, l is the cupping mean value of measured band steel.
6. the device that utilizes pinch roll adjustment band strip steel transverse warping according to claim 5 is characterized in that: the cylinder roll forming that the described pinch roll lower roll that negative convexity arranged is replaced with no convexity.
7. according to claim 5 or the 6 described devices that utilize pinch roll adjustment band strip steel transverse warping, it is characterized in that: described top pinch roll roller footpath is greater than bottom pinch roll roller footpath, last bottom pinch roll laterally closes on setting, and top pinch roll is offset certain distance L with respect to bottom pinch roll to band steel direction of advance.
8. the device that utilizes pinch roll adjustment band strip steel transverse warping according to claim 7, it is characterized in that: two pairs of differential roller shape pinch rolls are set on described coiling machine simultaneously and are equipped with corresponding two reels, two pairs of pinch roll center lines point-blank, when batching, select the pinch roll of different roll formings according to the difference of cupping size.
9. the device that utilizes pinch roll adjustment band strip steel transverse warping according to claim 8 is characterized in that: round-corner transition is adopted with the cambered surface intersection that convexity or concavity are arranged in the described pinch roll face of cylinder, and radius of corner is 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102111224A CN101693265B (en) | 2009-11-05 | 2009-11-05 | Method and device for adjusting strip steel transverse warping by using pinch rolls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102111224A CN101693265B (en) | 2009-11-05 | 2009-11-05 | Method and device for adjusting strip steel transverse warping by using pinch rolls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101693265A CN101693265A (en) | 2010-04-14 |
| CN101693265B true CN101693265B (en) | 2011-12-28 |
Family
ID=42092291
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102111224A Expired - Fee Related CN101693265B (en) | 2009-11-05 | 2009-11-05 | Method and device for adjusting strip steel transverse warping by using pinch rolls |
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| CN (1) | CN101693265B (en) |
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| CN102274862B (en) * | 2011-07-12 | 2013-11-06 | 马鞍山钢铁股份有限公司 | Method for overcoming rib raising drawback of cold-rolled steel strip |
| CN102632111B (en) * | 2012-04-06 | 2015-04-01 | 马钢(集团)控股有限公司 | Steel plate flattening machine and method for flattening steel plate by using steel plate flattening machine |
| CN102794332A (en) * | 2012-07-02 | 2012-11-28 | 麻斌 | Turtle-back fault rear-mounted type improved concave-convex roller straightening machine for steel board |
| JP5721764B2 (en) * | 2013-03-15 | 2015-05-20 | 株式会社ホタニ | C warp straightening machine |
| CN103801580B (en) * | 2014-01-24 | 2017-02-08 | 江苏省沙钢钢铁研究院有限公司 | Galvanized full-hard board cold-rolling edge crack control method in consideration of board shape |
| JP2016074023A (en) * | 2014-10-09 | 2016-05-12 | Ｊｆｅスチール株式会社 | Take-up device |
| CN104722598B (en) * | 2015-03-26 | 2016-09-14 | 中国重型机械研究院股份公司 | The cross sliding type Wrapping Roll of the double eccentric band convexity of mill |
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| CN112058917B (en) * | 2020-07-20 | 2023-03-21 | 武汉钢铁有限公司 | Method and device for controlling bright band and wave shape on surface of low-carbon mild steel |
| CN111790760B (en) * | 2020-07-20 | 2022-03-18 | 武汉钢铁有限公司 | Method for controlling bright strip and additional wave shape generated on surface of hot-rolled low-carbon mild steel and roller system device |
| CN112024611B (en) * | 2020-07-30 | 2021-09-14 | 东北大学 | Tension deviation rectifying control method and device for pinch roll in thin strip continuous casting |
-
2009
- 2009-11-05 CN CN2009102111224A patent/CN101693265B/en not_active Expired - Fee Related
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|---|---|
| CN101693265A (en) | 2010-04-14 |
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