CN110508624A - A kind of anti-strip steel head flies the controlling hot rolling method floatd - Google Patents
A kind of anti-strip steel head flies the controlling hot rolling method floatd Download PDFInfo
- Publication number
- CN110508624A CN110508624A CN201910664044.7A CN201910664044A CN110508624A CN 110508624 A CN110508624 A CN 110508624A CN 201910664044 A CN201910664044 A CN 201910664044A CN 110508624 A CN110508624 A CN 110508624A
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- China
- Prior art keywords
- working roll
- strip steel
- hot rolling
- floatd
- rolling method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
- B21B39/165—Guides or guide rollers for rods, bars, rounds, tubes ; Aligning guides
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Fly the controlling hot rolling method floatd the invention discloses a kind of anti-strip steel head, it is less than the total backlash of bottom working roll homalocephalus and lower flat head sleeve including the total backlash of control top working roll homalocephalus and upper flat head sleeve, it avoids strip steel head from being bent upwards, even fly to float, cause downstream rack or coiling machine not to bite normally, causes to roll the case where useless or head folds.
Description
Technical field
The present invention relates to a kind of controlling hot rolling methods that hot rolling technique field more particularly to anti-strip steel head fly to float.
Background technique
Temperature drop when ultra-thin gauge rolling in finishing mill is very fast, in order to guarantee head end rolling temperature, it is ensured that properties of product are full
Sufficient technique is required it is necessary to have higher threading speed, generally higher than 10m/s, under too fast threading speed, when the threading of head
Plate form control difficulty is significantly increased.In actual production, it often will appear the outlet rear frame F5 or F6 strip steel head and fly feelings of floaing
Condition causes downstream rack or coiling machine not to bite normally, causes to roll the technical issues of useless or head folds.
Summary of the invention
The embodiment of the present application flies the controlling hot rolling method floatd by providing a kind of anti-strip steel head, solves in the prior art
Cause downstream rack or coiling machine not to bite normally since strip steel head flies to float, the technology for rolling the folding of useless or head is caused to ask
Topic.
A kind of anti-strip steel head flies the controlling hot rolling method floatd, comprising: control top working roll homalocephalus is total with upper flat head sleeve
Gap is less than the total backlash of bottom working roll homalocephalus and lower flat head sleeve.
In one embodiment, the controlling hot rolling method further includes adjustment inlet guide relative elevation than bottom working roll water
The flat small 5-15mm of height.
In one embodiment, the controlling hot rolling method further includes adjustment outlet guide relative elevation than standard roll line
The small 5-20mm of absolute altitude.
In one embodiment, the controlling hot rolling method further includes the diameter for adjusting the working roll of rack F4-F6, is made same
The diameter of the top working roll of one rack is 0.2~0.5mm bigger than the diameter of bottom working roll；
The diameter for adjusting the working roll of rack F1-F6 is successively to successively decrease from F1 to F6, and work as adjacent rack with identical material
When matter, the diameter difference of the working roll of adjacent rack is less than 30mm.
In one embodiment, the controlling hot rolling method further includes that rear frame F4-F6 working roll is crossed steel gap
Cooling water inflow is improved to 70%-90%.
In one embodiment, the controlling hot rolling method further includes making rear frame F4- when middle wave occurs in strip
The roll shifting value of F6 reduces 10-30mm, and the bending roller force of rear frame F4-F6 is made to reduce 200-400KN.
In one embodiment, the controlling hot rolling method further includes that the quantity of loop transition plates is increased to 7 by 5
Root.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
The total backlash that top working roll homalocephalus is less than bottom working roll homalocephalus and lower flat head sleeve with the total backlash of upper flat head sleeve is controlled,
The dynamic velocity drop of top working roll is set to be less than the dynamic velocity drop of bottom working roll, and prompt drop recovery time is shorter, i.e. the speed of top working roll
Degree is greater than the speed of bottom working roll, and the belt steel surface elongation percentage of the big working roll side of speed is high, so when occur strip steel head to
When upper bending, the extension of lower surface is extended greater than by speed official post strip upper surface, thus avoid strip steel head continue to
Upper bending even flies to float, and downstream rack or coiling machine is caused not to bite normally, causes to roll the case where useless or head folds.
Specific embodiment
The embodiment of the present application flies the controlling hot rolling method floatd by providing a kind of anti-strip steel head, solves in the prior art
Cause downstream rack or coiling machine not to bite normally since strip steel head flies to float, the technology for rolling the folding of useless or head is caused to ask
Topic.
The technical solution of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
A kind of anti-strip steel head flies the controlling hot rolling method floatd, comprising: control top working roll homalocephalus is total with upper flat head sleeve
Gap is less than the total backlash of bottom working roll homalocephalus and lower flat head sleeve.
In order to better understand the above technical scheme, being carried out below by specific embodiment to above-mentioned technical proposal detailed
Thin explanation.
Embodiment one
It present embodiments provides a kind of anti-strip steel head and flies the controlling hot rolling method floatd, comprising: control top working roll homalocephalus
It is less than the total backlash of bottom working roll homalocephalus and lower flat head sleeve with the total backlash of upper flat head sleeve.
In the construction process, technological guidance's book of operator is only limitted to provide the size of working roll homalocephalus, flat head sleeve, and two
The size requirement of person: the size of flat head sleeve should be greater than the size of working roll homalocephalus, and bigger, is more conducive to homalocephalus and pierces into flat head sleeve.
Between total it has been found that dynamic velocity drop can be generated when strip bites milling train, and between flat head sleeve and homalocephalus
Gap has an impact to the dynamic velocity drop of working roll and the recovery time of dynamic velocity drop.
When strip bites milling train, working roll by strip steel head impact and dynamic velocity drop can be generated, be homalocephalus first
It will receive sudden surge and generate dynamic velocity drop, and then impact can be transitioned on flat head sleeve, and flat head sleeve is made to generate dynamic speed
Drop；Then the first resume speed setting value of flat head sleeve meeting of dynamic velocity drop is generated, and then drives homalocephalus resume speed setting value.If flat
The total backlash of headgear and homalocephalus is bigger, due to the presence in gap, homalocephalus is caused to turn by the first time flat head sleeve impacted
Square cannot inhibit the generation of dynamic velocity drop, therefore impact caused by working roll bigger, cause the dynamic velocity drop of working roll bigger,
And the total backlash of flat head sleeve and homalocephalus is bigger, and in the recovery process of dynamic velocity drop, flat head sleeve is more difficult to that homalocephalus is driven to carry out speed
Degree rises, and then causes speed recovery time elongated.
The present embodiment is flat under less than bottom working roll homalocephalus by the total backlash of control top working roll homalocephalus and upper flat head sleeve
The total backlash of headgear, makes the dynamic velocity drop of top working roll be less than the dynamic velocity drop of bottom working roll, i.e. the speed of top working roll is greater than
The speed of bottom working roll, and the prompt drop recovery time of top working roll is shorter, i.e., speed is restored faster compared to top working roll, speed
The belt steel surface elongation percentage of big working roll side is high, and then when strip steel head occur and being bent upwards, passes through speed official post strip
Upper surface extends greater than the extension of lower surface, so that strip steel head be avoided to continue up bending, even fly to float, leads to downstream machine
Frame or coiling machine can not normally bite, and cause to roll the case where useless or head folds.
During actual implementation, when each example is repaired, upper and lower working roll homalocephalus outer diameter, flat head sleeve internal diameter are measured respectively
Size assesses total backlash between the two, adjusts total backlash value by way of increasing gasket compensation or replacement, repairing, protects
It demonstrate,proves top working roll homalocephalus and flat head sleeve fit clearance is less than bottom working roll homalocephalus and flat head sleeve fit clearance.
It further include that adjustment inlet guide relative elevation is 5- smaller than bottom working roll level height as a kind of optional embodiment
15mm。
Inlet guide relative elevation refers to the highest point of inlet guide, reasonable inlet porting guide and guard relative elevation position, a side
Face is in order to which guarantee that strip can reduce the inhomogeneous deformation of upper and lower surface when entering roll gap area as far as possible, and then increase to fly to float can
It can property；On the other hand it is to occur hitting bottom working roll in order to avoid strip steel head, causes to fly the case where floaing.
It further include that adjustment outlet guide relative elevation is 5- smaller than standard roll line mark as a kind of optional embodiment
20mm。
Outlet guide relative elevation refers to the extreme lower position of outlet guide, and outlet guide relative elevation needs are periodically overhauling
When bracing wire measurement is carried out to it, by increase gasket mode adjust outlet guide lowest position relative to roll line absolute altitude in 5-
20mm range.If outlet guide relative elevation is excessive, it will lead to the strip steel head that milling train comes out and there is underriding, once it dives
Cause strip steel head to occur to hit generation head-bent in turn with outlet guide plate even to fly to stick up.
As a kind of optional embodiment, the diameter of the working roll of rack F4-F6 is adjusted, the top working roll of same rack is made
Diameter it is 0.2~0.5mm bigger than the diameter of bottom working roll；Adjust rack F1-F6 working roll diameter be from F1 to F6 successively
Successively decrease, and when adjacent rack has same material, the diameter difference of the working roll of adjacent rack is less than 30mm.
The top working roll diameter for adjusting rear frame F4-F6 is 0.2~0.5mm bigger than bottom working roll diameter, i.e. rear frame
In a manner of pushing, avoids strip steel head appearance from being up bent, occur flying to float.In addition the work roll diameter of rack F1-F6 is adjusted
Successively successively decrease, and in F1-F6 rack, when adjacent rack has same material, the diameter difference of the working roll of adjacent rack is small
In 30mm, during finish rolling is thinned, guarantees that the reduction ratio before and after F1-F6 rack increases, realize being thinned for strip, meanwhile,
The work roll diameter difference of the adjacent rack of strict control same material is less than 30mm, guarantees the steady change of reduction ratio, to guarantee essence
Belt steel surface is uniform during rolling, and reduces the risk for flying to float.
It during actual implementation, is referred to following table and carries out standby roller, wherein F1-F3 is same material, and F4-F6 is identical material
Matter.
| F1 | F2 | F3 | F4 | F5 | F6 | |
| Top working roll diameter | 846.06 | 825.04 | 797.14 | 738.94 | 718.23 | 702.77 |
| Bottom working roll diameter | 846.02 | 825.10 | 797.04 | 738.52 | 718.02 | 702.41 |
It is as shown in the table, and the top working roll of F4 is bigger than bottom working roll diameter by 0.42；The top working roll of F5 is than bottom working roll diameter
It is big by 0.21；The top working roll of F6 is bigger than bottom working roll diameter by 0.36, and diameter difference controls in 0.2~0.5mm；In addition, in table
F1-F3 is same material, and F4-F6 is same material, in the F1-F3 with same material, adjacent rack F1's and F2 is straight
Diameter difference is up to 21.02；The diameter difference of adjacent rack F2 and F3 are up to 28.06；For in the F4-F6 with same material,
The diameter difference of adjacent rack F4 and F5 are up to 20.09；The diameter difference of adjacent rack F5 and F6 are up to 15.82, and control exists
In 30mm.
It further include mentioning the cooling water inflow that rear frame F4-F6 working roll crosses steel gap as a kind of optional embodiment
Up to 70%-90%.When crossing steel gap and referring specifically to the operation of no strip, the gap between rack working roll.
When normal rolling, roll crosses cooling water inflow when steel gap cooling water is less than milling train load, saves in this way in rolling
When playing very fast, the cooling deficiency in roll seam is easily led to, roller heat convex degree learning is excessive, causes product convexity too small or even thin gauge occurs
Middle wave problem.
In the later period of rolling, since rolling rhythm quickening or amount of rolling increase, since the work roll temperature of working roll is excessively high
It is big to will cause work roll thermal crown, will lead to strip plastic deformation unevenness in rolled band steel, strip steel head bending is caused even to fly to float.
Therefore, the water that steel gap is crossed in raising for cooling down rear frame F4-F6 working roll is improved to 70%-90%, for example, winter is
70%, summer 90%, and when normal load still it is 100%, the roller temperature of working roll can be made to be effectively controlled.
It further include the roll shifting value for making rear frame F4-F6 when middle wave occurs in strip as a kind of optional embodiment
10-30mm is reduced, the bending roller force of rear frame F4-F6 is made to reduce 200-400KN.
During actual implementation, middle wave occurs for strip threading, is easy to happen and flies to float.To control the head of F4-F6 rack
Unrestrained defect in portion is found through experiments that head, which occurs, to these flies the amendment that the rack floatd carries out bending roller force, roll shifting value, so that band
Edge extension is extended less than in the middle part of steel, is eliminated middle part convexity, has been attempted roll shifting and reduced 10-30mm on the basis of setting value, it is curved
The bright alleviation of the case where roller power reduces 200-400KN on the basis of setting value, and convexity can be significantly smaller, and middle wave occurs.
It further include that the quantity of loop transition plates is increased to 7 by 5 as a kind of optional embodiment.In strip
In crossing process, loop transition plates is used to support strip, guarantees the stabilization, accurate of threading；It, will be original during actual implementation
The quantity of loop transition plates increases to 7 by 5, is encrypted, and reduces spacing and exists, strip is transitioned into next roll from loop
It when machine, avoids loop transition plates excessively sparse, reduces the risk that strip steel head is hit, and then reduce and fly possibility of floaing.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So appended claims should be construed as including excellent
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention should also be as including these modifications and variations.
Claims (7)
1. a kind of anti-strip steel head flies the controlling hot rolling method floatd characterized by comprising
Control the total backlash that top working roll homalocephalus is less than bottom working roll homalocephalus and lower flat head sleeve with the total backlash of upper flat head sleeve.
2. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
The relative elevation for adjusting inlet guide is 5-15mm smaller than the level height of bottom working roll.
3. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
The relative elevation for adjusting outlet guide is 5-20mm smaller than standard roll line absolute altitude.
4. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
The diameter for adjusting the working roll of rack F4-F6, keeps the diameter of the top working roll of same rack bigger than the diameter of bottom working roll
0.2~0.5mm；
The diameter of the working roll of rack F1-F6 is adjusted successively to successively decrease from F1 to F6, and when adjacent rack has same material,
The diameter difference of the working roll of the adjacent rack is less than 30mm.
5. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
The cooling water inflow that rear frame F4-F6 working roll crosses steel gap is improved to 70%-90%.
6. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
When middle wave occurs in strip, the roll shifting value of rear frame F4-F6 is made to reduce 10-30mm, makes that rear frame F4-F6's is curved
Roller power reduces 200-400KN.
7. anti-strip steel head as described in claim 1 flies the controlling hot rolling method floatd, which is characterized in that further include:
The quantity of loop transition plates is increased to 7 by 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910664044.7A CN110508624A (en) | 2019-07-23 | 2019-07-23 | A kind of anti-strip steel head flies the controlling hot rolling method floatd |
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| CN201910664044.7A CN110508624A (en) | 2019-07-23 | 2019-07-23 | A kind of anti-strip steel head flies the controlling hot rolling method floatd |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451272A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Finish rolling control method for thin container steel plate |
| CN111451290A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Production method for preventing thin strip steel head from being folded |
| CN115338271A (en) * | 2022-07-12 | 2022-11-15 | 安阳钢铁股份有限公司 | Method for improving warping buckle head of rolled piece |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451272A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Finish rolling control method for thin container steel plate |
| CN111451290A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Production method for preventing thin strip steel head from being folded |
| CN115338271A (en) * | 2022-07-12 | 2022-11-15 | 安阳钢铁股份有限公司 | Method for improving warping buckle head of rolled piece |
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