CN107433288B - It is a kind of based on advancing slip milling train Convenient stable criterion - Google Patents
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- 238000003801 milling Methods 0.000 title claims abstract description 38
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 230000001264 neutralization Effects 0.000 claims description 37
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000000875 corresponding Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005097 cold rolling Methods 0.000 abstract description 4
- 238000009795 derivation Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000005489 elastic deformation Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
Abstract
The invention discloses a kind of based on advancing slip milling train Convenient stable criterion, this method is directed in practical cold rolling production and is widely present strip " bearing advancing slip ", by to the plasticity of strip inside and outside cold rolling area and the modeling of elastic deformation and theory analysis, derivation establishes new forward slip model, and new model can calculate the advancing slip value of rolling zone including " bearing advancing slip ".Based on the new forward slip model, establish advancing slip value and rolling zone skidding discriminant relation and advancing slip value and rolling mill vibration discriminant relation, so as to preferably judge the stability problem of milling train, specify the quantitative relationship between advancing slip value and milling train unstability, rolling technological parameter numerous in cold continuous rolling process simultaneously can observe the variation of advancing slip value directly to predict to judge milling train operating status, implement the on-line monitoring to milling train operating status.
Description
Technical field
The present invention relates to the technical fields of steel rolling process application, are sentenced more particularly to a kind of based on advancing slip milling train stability
Other method.
Background technique
Strip is the stem product of steel and iron industry, production technology level and Mass accuracy alignment target a country
Steel and iron industry state-of-art.Cold-rolled steel sheet with its excellent processability, be widely used in automobile, household electrical appliances,
Each main department of the national economy such as light industry, building becomes a kind of important industrial raw materials.
With the change of the market demand, the yield of thin gauge (thickness≤0.5mm) strip is stepped up.Thin gauge strip is wide
Thickness rate is big, and reduction ratio is big, and speed of production is high.During the rolling process, the muzzle velocity of rolled piece showing slightly larger than roll speed
As being referred to as advancing slip phenomenon.Advancing slip is the important technical parameter in the operation of rolling, equally also plays and focuses in operation of rolling control
It acts on.In recent years, the coming into operation to high speed, very thinization development and laser velocimeter with cold continuous rolling, in cold continuous rolling
Last rack or rear two racks measured result indicating strip there is " bearing advancing slip " this phenomenon, i.e. the muzzle velocity of rolled piece is less than
The peripheral speed of roll.For practical cold rolling production in be widely present strip " bearing advancing slip ", and at present various advancing slip computation models
It cannot all provide and bear advancing slip value, strip, which easily occurs to skid, when " bearing advancing slip " influences easily to cause to roll when surface quality and too big advancing slip value
Machine vibration.Milling train skidding easily occurs especially on fast state in the actual production process or unstable phenomenon occurs in vibration, influences just
Often production, causes product quality unqualified, be easy to cause production accident to jeopardize personal safety under serious conditions.
Therefore, it in order to guarantee that thin gauge strip leads to plate in the stabilization of tandem mills, need to be proposed in conjunction with unit productive prospecting
A method of improving mill milling process stability.
Summary of the invention
The present invention in order to overcome the above-mentioned deficiencies of the prior art, provides a kind of based on advancing slip milling train stability distinguishing side
Method.
The technical scheme adopted by the invention is that:
It is a kind of based on advancing slip milling train Convenient stable criterion, comprising the following steps:
S1, using Bland-Ford roll-force formula, obtain the advancing slip Dresden formula for cold continuous rolling:R ' is working roll radius in formula；For neutral angle size；houtTo export steel strip thickness；
foutFor advancing slip value.
S2, Dresden formula is modified.
Assuming that thering is one to continue rolling outlet strip with working roll symmetrical " spill roller ", when " spill roller " and strip speed
When identical, the cornerite of " spill roller " and strip is defined as new neutral angle at this timeAnd thinkFind the neutrality of hypothesis
Advancing slip value at this time can be calculated behind angle, derivation process is consistent with front, available revised Dresden formula:
R ' is working roll radius in formula；For neutral angle size；houtTo export steel strip thickness；foutFor advancing slip value；
S3, to forward slip model to neutral angleIt is modified:
Revised advancing slip calculation formula is as follows:
R ' is working roll radius in formula；For neutral angle size；For revised neutral angle；houtIt is thick for outlet strip
Degree；fout' it is the revised advancing slip value of neutral angle；For neutral angle correction size；Δ l is contact arc length variable quantity.
S4, milling train stability distinguishing standard are as follows: work as foutWhen ' < 1, milling train is unstable, occurs advancing slip.
Under S5, unusual service condition warning output and provide solve countermeasure occur to avoid advancing slip phenomenon.
As an improvement of the above technical solution, in the practical operation of rolling, due to roll differential gap presence, cause even if
Slipping phenomenon also can not necessarily occur when surveying obtained advancing slip value less than 1, only when advancing slip value it is small to a certain extent when just meeting
It skids, therefore considers the presence of operation of rolling differential gap, calculate critical advancing slip value of skidding.
R ' is working roll radius in formula；For neutral angle size；For critical skidding neutral angle；L is contact arc length；
fout" for critical advancing slip value of skidding；
Milling train stability distinguishing standard are as follows: work as fout" when < 1, milling train is unstable, skids.
As an improvement of the above technical solution, the critical speed that unstability is vibrated by roller system is calculated by stability criterion, then
It is calculated by forward slip model corresponding critical advancing slip, it can the criterion as rolling mill vibration.
R ' is working roll radius in formula；It is critical mill speed vrcWhen corresponding neutral angle；houtIt is thick for outlet strip
Degree；Critical mill speed vrcWhen corresponding advancing slip value；
Milling train stability distinguishing standard are as follows: whenWhen, milling train is unstable, vibrates.
Beneficial effects of the present invention: it is a kind of based on advancing slip milling train Convenient stable criterion, by cold rolling area
The plasticity of outer strip and the modeling of elastic deformation and theory analysis, derivation establish new forward slip model, which can calculate packet
Include the advancing slip value of rolling zone including " bearing advancing slip ".Based on the new forward slip model, establishes advancing slip value and rolling zone skids and differentiates pass
It is formula and advancing slip value and rolling mill vibration discriminant relation, so as to preferably judge the stability problem of milling train.
Detailed description of the invention
Fig. 1 is working roll and rolled piece rolled structure figure；
Neutral angle when Fig. 2 is negative advancing slip assumes definition；
Fig. 3 is stagnant zone (differential gap) schematic diagram；
Fig. 4 is changing rule of the vibration critical speed with coefficient of friction；
Fig. 5 is changing rule of the advancing slip value of vibration critical with coefficient of friction；
Fig. 6 is changing rule of the vibration critical speed with resistance of deformation；
Fig. 7 is changing rule of the advancing slip value of vibration critical with resistance of deformation.
Fig. 8 is main flow chart.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
It is a kind of based on advancing slip milling train Convenient stable criterion including following when it is implemented, in conjunction with Fig. 8 main flow chart
Step:
S1, in conjunction with Fig. 1 working roll and rolled piece rolled structure figure, using Bland-Ford roll-force formula, obtain for cold
The advancing slip Dresden formula of tandem rolling, calculates the advancing slip value of rolled piece:
Wherein R ' is working roll radius；For neutral angle size；houtTo export band
Steel thickness；foutFor advancing slip value.
S2, the discovery calculated advancing slip value f of Dresden formula is calculatedoutIt is all larger than 1, this is not inconsistent with actual conditions.Institute
To be modified to Dresden formula.
Neutral angle when bearing advancing slip in conjunction with Fig. 2 assumes definition, it is assumed that has one to continue with working roll symmetrical " spill roller "
Rolling outlet strip, when " spill roller " is identical as strip speed, the cornerite of " spill roller " and strip is defined as in new at this time
Property angleAnd think
Revised Dresden formula can be calculated after finding the neutral angle of hypothesis.
Wherein R ' is working roll radius；For neutral angle size；houtTo export steel strip thickness；foutIt is advancing slip.
S3, increased according to forward slip model nip angle, the advancing slip value being calculated with master mould is less than normal, so need to be into one
Step is modified forward slip model neutral angle:
For neutral angle correction size；Δ l is contact arc length variable quantity；For revised neutral angle；
Revised advancing slip calculation formula is as follows:
R ' is working roll radius in formula；For revised neutral angle；houtTo export steel strip thickness；fout' it is neutral angle
Revised advancing slip value.
S4, milling train stability distinguishing standard are as follows: work as foutWhen ' < 1, milling train is unstable, occurs advancing slip.
S4.1, the critical advancing slip value of operation of rolling skidding calculate.
In the practical operation of rolling, due to rolling the presence of differential gap, cause when the advancing slip value that actual measurement obtains is less than 1
Also slipping phenomenon can not necessarily occur, only when advancing slip value it is small to a certain extent when can just skid, therefore consider rolled
The presence of journey differential gap calculates critical advancing slip value of skidding in conjunction with the stagnant zone Fig. 3 (differential gap) schematic diagram.
L is contact arc length in formula,For critical skidding neutral angle, recycle advancing slip calculating public
Formula obtains critical advancing slip value of skidding,
R ' is working roll radius in formula；For neutral angle size；For critical skidding neutral angle；foutIt is " critical to skid
Advancing slip value；
Milling train stability distinguishing standard are as follows: work as fout" when < 1, milling train is unstable, skids.
S4.2, changing for roll and rolled piece skin-friction coefficient and deformation of rolled wire drag is influenced according to the change of mill speed
Become, unstability critical speed and critical advancing slip influence are analyzed.Roller system, which is calculated, by stability criterion vibrates unstability
Critical speed, then calculated by forward slip model corresponding critical advancing slip.
R ' is working roll radius in formula；It is critical mill speed vrcWhen corresponding neutral angle；houtIt is thick for outlet strip
Degree；Critical mill speed vrcWhen corresponding advancing slip value；
Milling train stability distinguishing standard are as follows: whenWhen, milling train is unstable, vibrates.
Under S5, unusual service condition warning output and provide solve countermeasure to avoid skid, oscillation phenomenon occur.
The present invention applies 1420 tandem mills of Mr. Yu factory, improves the stability of the cold continuous rolling operation of rolling.In conjunction with
Changing rule of Fig. 4 vibration critical speed with coefficient of friction, Fig. 5 vibration critical is advancing slip changing rule, Fig. 6 with coefficient of friction of value
Vibration critical speed with the changing rule of resistance of deformation, Fig. 7 vibration critical is advancing slip value with resistance of deformation changing rule, it is specific to join
Numerical value is as follows:
Certain factory cold continuous rolling F4 rack hin4=0.62mm, hout4=0.50mm and F5 rack hin4=0.50mm, hout4=
0.42mm is typical rolling schedule, and taking friction coefficient μ ∈ [0.02,0.19] is affecting parameters, calculates F4 rack and F5 rack exists
Unstability critical speed and advancing slip value under different coefficients of friction.Under typical case's rolling schedule, when coefficient of friction is 0.03, F4 machine
Frame mill speed is more than 1250m/min, advancing slip value is greater than 1.053 may vibrate；F5 rack mill speed is more than
1680m/min, advancing slip value, which are greater than 1.032, to be vibrated.Using F4 rack as object, identical rolling pressure is set and is opened
The technological parameters such as power change deformation of rolled wire drag, calculate unstability critical speed and critical advancing slip value.In typical case's rolling schedule
Under, when deformation of rolled wire drag is 840MPa, F4 rack mill speed is more than 1340m/min, advancing slip value greater than 1.0533 may
It vibrates.
Under typical case's rolling schedule, the critical advancing slip value of F4 rack skidding is 0.964, i.e., when advancing slip value is less than 0.964 just
Slipping phenomenon may occur, the critical advancing slip value of F5 rack skidding is 0.943, i.e., may occur to beat when advancing slip value is less than 0.943
Sliding phenomenon.
It is 85% or more to rolling mill vibration forecast accuracy after applying the present invention to the production line, skids to milling train pre-
Reporting accuracy rate is 82% or more, effectively increases the stability of mill milling process, improves product quality.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (3)
1. a kind of based on advancing slip milling train Convenient stable criterion, which comprises the following steps:
S1, using Bland-Ford roll-force formula, obtain the advancing slip calculation formula of Dresden for cold continuous rolling, it is described
Dresden is advancing slip, and calculation formula is
R ' is working roll radius in formula；For neutral angle size；houtTo export steel strip thickness；foutFor advancing slip value；
S2, the advancing slip calculation formula of Dresden is modified,
Assuming that there is one to continue rolling outlet strip with the symmetrical spill roller of working roll, when spill roller is identical as strip speed,
The cornerite of spill roller and strip is defined as new neutral angle at this timeAnd thinkIt is advancing slip to obtain revised Dresden
Calculation formula,
R ' is working roll radius in formula；For neutral angle size；houtTo export steel strip thickness；foutFor advancing slip value；
S3, to neutral angleIt is modified, obtains revised neutral angle
The revised Dresden of neutral angle is advancing slip, and calculation formula is as follows,
R ' is working roll radius in formula；For neutral angle correction size；For neutral angle size；In revised
Property angle；houtTo export steel strip thickness；fout' it is the revised advancing slip value of neutral angle；Δ L is contact arc length variable quantity；
S4, milling train stability distinguishing standard are as follows: work as foutWhen ' < 1, milling train is unstable, occurs advancing slip；
Under S5, unusual service condition warning output and provide solve countermeasure occur to avoid advancing slip phenomenon.
2. described in accordance with the claim 1 a kind of based on advancing slip milling train Convenient stable criterion, which is characterized in that the S4 rolls
In machine stability distinguishing standard, slipping phenomenon also can not necessarily occur when advancing slip value is less than 1, only arrive certain journey when advancing slip value is small
It can just skid when spending, consider the presence of operation of rolling differential gap, calculate critical advancing slip value of skidding；
R ' is working roll radius in formula；For neutral angle size；For critical skidding neutral angle；L is contact arc length；houtFor
Export steel strip thickness；fout" for critical advancing slip value of skidding；
Milling train stability distinguishing standard are as follows: work as fout" when < 1, milling train is unstable, skids.
3. described in accordance with the claim 1 a kind of based on advancing slip milling train Convenient stable criterion, which is characterized in that the S4 rolls
In machine stability distinguishing standard, the critical mill speed that unstability is vibrated by roller system is calculated by stability criterion, then by advancing slip
Model calculates corresponding critical advancing slip value,
R ' is working roll radius in formula；It is critical mill speed vrcWhen corresponding neutral angle；houtTo export steel strip thickness；For critical mill speed vrcWhen corresponding critical advancing slip value；
Milling train stability distinguishing standard are as follows: whenWhen, milling train is unstable, vibrates.
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| CN108296284B (en) * | 2018-01-18 | 2019-06-11 | 太原科技大学 | A kind of calculation method of the snakelike Calculating Rolling Force Energy Parameters of the synchronized reducing of thick steel plate |
| CN108655179B (en) * | 2018-05-31 | 2019-08-23 | 太原晋西春雷铜业有限公司 | Metal plates and strips roll advancing slip control method |
| CN109092902B (en) * | 2018-06-20 | 2019-09-27 | 新疆八一钢铁股份有限公司 | The first rolling mill is prevented to sting the milling method of steel skidding |
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| JP2001137918A (en) * | 1999-11-16 | 2001-05-22 | Kobe Steel Ltd | Setup method of hot-rolling mill |
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