CN109877167A - A kind of tension influence Coefficient Analysis method improving freedom degree rolling stability - Google Patents
A kind of tension influence Coefficient Analysis method improving freedom degree rolling stability Download PDFInfo
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Abstract
The present invention provides a kind of tension influence Coefficient Analysis method for improving freedom degree rolling stability, belongs to operation of rolling control technology field.This method obtains the recessive relationship between roll-force and tension and mill speed first, and combining scene practical, limitation is carried out average equal part by the limiting value of versus speed, the velocity amplitude of the outlet each equal part of rack is obtained, and then obtains the velocity amplitude of each rack；Then the roll-force when most high speed of the corresponding roll-force of different speed points and permission is calculated, and then corresponding roll-force after computer rack forward pull and backward pull variation, last computer rack forward pull and backward pull influence coefficient.By the method for data statistic analysis, the quantitative analysis relationship of each rack tension and roll-force, and the tension adjustment suggestion of each rack is given, powerful support is provided for new varieties rolling stability.
Description
Technical field
The present invention relates to operation of rolling control technology fields, particularly relate to a kind of tension for improving freedom degree rolling stability
Influence Coefficient Analysis method.
Background technique
Free regulation rolling technology (SFR, Schedule Free Rolling) is proposed by Japan earliest, it is therefore an objective to be used
Comprehensive Technology of Flexibility guarantees the connection of rigidization production process, breaks the rolling scaduled constraint to production.Domestic free regulation rolling
Technical research is started late, and rolling freedom degree is related to equipment capability, process conditions, not absolute liBerty.
In cold continuous rolling actual production, a cold continuous rolling production line is in order to improve rolling stability and obtain good product
Quality, cold-rolling process are clearly required to rolling scaduled, it is contemplated that rolling model precision, self study efficiency and threading rolling are steady
Qualitative etc., steel grade, thickness and width specification cannot significantly jump, and need to arrange transition material other than contract and guarantee that main material is raw
It produces.But with the increasingly fierceness of market competition, small lot, more specification orders are more prevalent, and for manufacturing enterprise, more steel
Kind, more specifications, small lot production model will be increasingly becoming development trend, although cannot achieve " what coming, what is rolled " at present
Free rolling in this ideal, but the stability of freedom degree rolling can be improved by some feasible means.
For tandem mills, in process of production, tension between the rack rolling mill practice ginseng important as one
Number, very important influence is played to the stability of rolling, when the front and back tension of certain rack is constant, roll-force and mill speed
Close relation, since the frictional force between roll and milling train can change as mill speed changes, and frictional force is roll-force
One of most important influence factor, therefore, roll-force can also change with the variation of mill speed, in general, roll-force
The relationship being inversely proportional with mill speed, in milling train allowed band, mill speed is bigger, and corresponding roll-force is smaller.It is changing
Kind when changing specification rolling, due to also not up to producing in batches, starts the low speed rolling all taken, and the roll-force of low speed segment
Much higher when often stablizing than high speed, roll-force is excessively high not only bad for steel strip thickness control and profile regulation, can also make to roll
Stability processed is affected, and disconnected band risk increases.Therefore, when changing kind, changing specification rolling, site operation personnel is often led to
Adjustment tension is crossed to guarantee the stabilization of roll-force, but method of adjustment is supported without theory, such tune by experience mostly
It has suffered point and to rely on an artificial experience, be unfavorable for the consistent of production stability and product quality.
Existing more document is set for studying to stable rolling with tension, patent of invention " a kind of stable rolling it is cold
Tandem rolling tension dynamic setting method " tension of (application number 201610785176.1) by dynamic setting friction speed section, guarantor
Roll-force is demonstrate,proved in the smooth transition in friction speed section, reduces the disconnected band risk under lower-speed state, it is ensured that milling train steady production.Hair
A kind of bright patent " tensile stress dynamic compensation method for improving rolling process stability " (application number 201710899411.2) passes through
Dynamic compensation is carried out to the preceding tensile stress of rack and rear tensile stress within the scope of entire mill speed, realizes the stable operation of rolling.
Patent of invention " a method of the tension optimization compensation adjusted for roll-force " (application number 201410026947.X) is by excellent
Change setting tension, realizes the defects of the production cost increases and plate shape caused by utmostly reducing because of the raising of iron powder concentration abnormality
Incidence, guarantee the stability of the operation of rolling.The above patent of invention has carried out tension compensating for the variation of speed, but does not all have
There is the influence relationship of tension and roll-force when rolling different cultivars specification is discussed in detail, for the tension tune at new varieties rolling initial stage
It is whole to provide specific instruction.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of tension for improving freedom degree rolling stability to influence coefficient point
Analysis method guarantees the rolling stability at rolling initial stage when rolling new varieties, new spec in cold continuous rolling producing line.
It is as follows that the method comprising the steps of:
(1) using the live rolling data obtained and rolling therory, tube rolling simulation model is arranged, roll-force is obtained and opens
Recessive relationship between power and mill speed, tube rolling simulation model formation are as follows:
Wherein, Rf is roll-force, KfmFor the average deformation drag of strip, LcFor contact arc length, hmFor the average thickness of strip
Degree, TfAnd TbThe respectively forward direction tension and backward tension of strip, WenFor strip width, u is coefficient of friction；
(2) actual conditions at scene, the limiting value of versus speed, including equipment is combined to allow maximum value VEmaxPermit with technique
Perhaps maximum value VTmax, take in the two smaller value as muzzle velocity limiting valueThen limitation is carried out average etc.
Point, obtain the velocity amplitude of the outlet each equal part of rackFurther according to second flow principle, the velocity amplitude of each rack is obtainedI.e.
Wherein, hsFor milling train exit thickness, hmFor the exit thickness of m rack, n is the speed point quantity formed after equal part；
(3) the tube rolling simulation model rf (...) according to obtained in step (1), Rf=rf (V, h, Tb, Tf, u, Kf, Wen,
Lc...), calculate the corresponding roll-force of different speed pointsAnd allow most high speed when roll-force
That is:
Wherein: h is steel strip thickness；
(4) rack forward pull variable quantity is givenAccording to tube rolling simulation model rf (...), computer rack forward pull becomes
Corresponding roll-force after change
Wherein, V is mill speed；
(5) rack backward pull variable quantity is givenAccording to tube rolling simulation model rf (...), computer rack backward pull becomes
Corresponding roll-force after change
(6) according to the roll-force under friction speedRoll-force after the variation of rack forward pullIt calculates
Rack forward pull influences coefficient eff_Rf_Tf:
(7) according to the roll-force under friction speedRoll-force after the variation of rack backward pullIt calculates
Rack backward pull influences coefficient eff_Rf_Tb:
Wherein, the rolling data that scene obtains in step (1) includes each rack mill speed, tension before and after each rack, each
Rack strip exit thickness, strip width, mill length etc..
Coefficient of friction in step (1)
Wherein, u0For friction factor, duvFor coefficient relevant to lubrication, v0For with reference to mill speed, v is mill speed,
CRFor roughness value, R is gloss level of roll, R0For with reference to roughness, L is accumulative mill length, CwFor the coefficient of waste, L0For
Benchmark mill length.
The average deformation drag of strip in step (1)
Wherein,k0、k1、k2For the coefficient of resistance of deformation, hio、hi1The respectively each machine of strip
The inlet thickness and exit thickness of frame, h0For inlet of rolling mill thickness,For rate of deformation.
N is 7 in step (2).
Tension influences coefficient eff_Rf_T before and after rack in step (6) and step (7)f、eff_Rf_TbWith log mode
Output.
After the completion of this method model calculates, collects model and calculate output journal, from the creation data of magnanimity, to each machine
The front and back tension of frame influences coefficient and carries out analysis and arrangement, and tension influences coefficient in each machine before and after providing rack during the rolling process
The distribution situation of frame forms analysis document, and tension adjustment provides strong support when changing kind for scene, change specification rolling, improves
Freedom degree rolling stability.
The advantageous effects of the above technical solutions of the present invention are as follows:
In above scheme, when changing kind, changing specification rolling, by being segmented to speed, each waypoint pair is calculated
The influence coefficient of the roll-force and tension answered quantifies influence of the tension to roll-force of each rack, and influence is precipitated in statistical
The factor provides tension adjustment suggestion in the distribution situation of each rack, be conducive to operator it is open-and-shut recognize it is each
The adjustment state of rack tension guarantees the steady or minor change of roll-force when realizing adjustment tension, and then to realize freely
The stability of degree rolling provides strong support.
Using the present invention, in cold continuous rolling production process, when being transformed to the rolling of high-strength steel kind by the rolling of straight carbon steel kind,
Tension by calculating friction speed section influences coefficient, provides the tension adjustment suggestion of each rack, instructs scene rolling work
Skill targetedly adjusts tension at high-strength steel rolling initial stage, so that roll-force remains stable state, rolls initial stage
The disconnected band number of milling train drops to monthly from monthly 20 times less than 5 times.
The invention can realize that freedom degree rolling provides strong support, and meets user and customizes demand for production line.
Detailed description of the invention
Fig. 1 is that the tension of raising freedom degree rolling stability of the invention influences Coefficient Analysis method process flow chart；
Fig. 2 is " the entrance tension that each speed point of steel grade 51AO1 corresponds to rack influences coefficient " signal in the embodiment of the present invention
Figure；
Fig. 3 is " the outlet tension that each speed point of steel grade 51AO1 corresponds to rack influences coefficient " signal in the embodiment of the present invention
Figure；
Fig. 4 is " the entrance tension that each speed point of steel grade M3A25 corresponds to rack influences coefficient " signal in the embodiment of the present invention
Figure；
Fig. 5 is " the outlet tension that each speed point of steel grade M3A25 corresponds to rack influences coefficient " signal in the embodiment of the present invention
Figure.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of tension influence Coefficient Analysis method for improving freedom degree rolling stability, changes product in producing line
When planting, changing specification rolling, by being segmented to speed, the influence system of the corresponding roll-force of each waypoint and tension is calculated
Number, quantifies influence of the tension to roll-force of each rack, and impact factor is precipitated in the distribution situation of each rack in statistical,
Tension adjustment suggestion is provided, improves powerful support for stable rolling.
As shown in Figure 1, that the method comprising the steps of is as follows:
It comprises the following steps that
(1) using the live rolling data obtained and rolling therory, tube rolling simulation model is arranged, roll-force is obtained and opens
Recessive relationship between power and mill speed, tube rolling simulation model formation are as follows:
Wherein, Rf is roll-force, KfmFor the average deformation drag of strip, LcFor contact arc length, hmFor the average thickness of strip
Degree, TfAnd TbThe respectively forward direction tension and backward tension of strip, WenFor strip width, u is coefficient of friction；
(2) actual conditions at scene, the limiting value of versus speed, including equipment is combined to allow maximum value VEmaxPermit with technique
Perhaps maximum value VTmax, take in the two smaller value as muzzle velocity limiting valueThen limitation is carried out average etc.
Point, obtain the velocity amplitude of the outlet each equal part of rackFurther according to second flow principle, the velocity amplitude of each rack is obtainedI.e.
Wherein, h5For milling train exit thickness, hmFor the exit thickness of m rack, n is the speed point quantity formed after equal part；
(3) the tube rolling simulation model rf (...) according to obtained in step (1), Rf=rf (V, h, Tb, Tf, u, Kf, Wen,
Lc...), calculate the corresponding roll-force of different speed pointsAnd allow most high speed when roll-force
That is:
Wherein: h is steel strip thickness；
(4) rack forward pull variable quantity is givenAccording to tube rolling simulation model rf (...), computer rack forward pull becomes
Corresponding roll-force after change
Wherein, V is mill speed；
(5) rack backward pull variable quantity is givenAccording to tube rolling simulation model rf (...), computer rack backward pull becomes
Corresponding roll-force after change
(6) according to the roll-force under friction speedRoll-force after the variation of rack forward pullIt calculates
Rack forward pull influences coefficient eff_Rf_Tf:
(7) according to the roll-force under friction speedRoll-force after the variation of rack backward pullIt calculates
Rack backward pull influences coefficient eff_Rf_Tb:
Coefficient of friction in step (1)
Wherein, u0For friction factor, duvFor coefficient relevant to lubrication, v0For with reference to mill speed, v is mill speed,
CRFor roughness value, R is gloss level of roll, R0For with reference to roughness, L is accumulative mill length, CwFor the coefficient of waste, L0For
Benchmark mill length.
The average deformation drag of strip in step (1)
Wherein,k0、k1、k2For the coefficient of resistance of deformation, hio、hi1The respectively each machine of strip
The inlet thickness and exit thickness of frame, h0For inlet of rolling mill thickness,For rate of deformation.
Tension influences coefficient eff_Rf_T before and after rack in step (6) and step (7)f、eff_Rf_TbWith log mode
Output.
Below by taking a specific cold continuous rolling producing line as an example, the product of the producing line primarily focuses on battle wagon plate and household electrical appliances
Plate, total installation of generating capacity 34090kW, rolling outlet maximum speed is 1400m/min.Raw material is low-carbon hot-rolled steel, Ultra-low carbon
Steel (IF steel) and Hi-Stren steel etc., raw thickness range be 1.60mm~6.00mm, raw material width: 800~1900mm,
Product thickness range is 0.2mm~2.5mm；Raw material width range is 800mm~1870mm.Five machine of continuous rolling process Duan Youxi mark
Frame tandem cold continuous rolling composition, is all made of six roller CVC, can carry out intermediate roll shifting and intermediate calender rolls, work roll bending；Producing line
Tension control system is Siemens TDC, is fitted with ABB tension detecting instrument table before and after each rack.
As the increasingly fierceness of market competition adapts to small to further compress finished product and improve the production capacity more than needed of unit
In batches, the Production trend of more specifications will roll new varieties, such as rolling high-strength steel in the producing line, and the present invention is mainly with high-strength
For steel M3A25 and 51AO1, reason is provided when carrying out tension adjustment during rolling for it in order to avoid roll-force variation is excessive
By support.
Step 1: it is each to calculate steel grade M3A25,51AO1 for the rolling data and the model of procedural computation obtained using scene
Roll-force, tension and the mill speed of rack.
The PDI data of steel grade M3A25,51AO1 are as shown in the table.
| Steel grade/reel number | Raw thickness (mm) | Finished product thickness (mm) | Finished width (mm) |
| M3A25/1620293321040 | 3.430 | 1.000 | 1289 |
| 51AO1/1630410622030 | 3.420 | 1.440 | 1249 |
It is as shown in the table that the model of steel grade M3A25 calculates data.
| M3A25 | 1# | 2# | 3# | 4# | 5# | Outlet |
| Roll-force (KN) | 18819 | 14021 | 12713 | 12891 | 9006 | |
| Tension (N/mm2) | 50 | 130 | 155 | 175 | 185 | 50 |
| Mill speed (m/min) | 434 | 612 | 845 | 1096 | 1108 |
It is as shown in the table that the model of steel grade 51AO1 calculates data.
| 51AO1 | 1# | 2# | 3# | 4# | 5# | Outlet |
| Roll-force (KN) | 12379 | 12208 | 11911 | 11786 | 9992 | |
| Tension (N/mm2) | 50 | 130 | 155 | 175 | 185 | 50 |
| Mill speed (m/min) | 558 | 708 | 882 | 1056 | 1108 |
Step 2: by taking steel grade M3A25,5# rack as an example, comparing 5# rack outlet maximum technique according to live actual condition
Speed and maximum device speed provide the maximum speed that this patent carries out speed division, and are divided in the way of dividing equally,
7 equal parts are divided into, 8 speed points are formed.
According to above formula, the speed for calculating each equal branch of 5# rack is as follows:
8th speed point be
7th speed point be
6th speed point be
5th speed point be
4th speed point be
3rd speed point be
2nd speed point be
1st speed point be
Step 3: according to the velocity amplitude of the speed point calculated, the initial data and model of steel grade M3A25 strip are utilized
Constant calculates the corresponding roll-force of each speed point by rolling force model
The 8th corresponding roll-force of speed point be
The 7th corresponding roll-force of speed point be
The 6th corresponding roll-force of speed point be
The 5th corresponding roll-force of speed point be
The 4th corresponding roll-force of speed point be
The 3rd corresponding roll-force of speed point be
The 2nd corresponding roll-force of speed point be
The 1st corresponding roll-force of speed point be
Step 4: giving each rack forward pull variable quantityVariable quantity is the 8% of 5# rack outlet forward pull, is calculated each
Rack forward pull changes corresponding roll-forceAnd according to the value of the corresponding roll-force of speed point beforeAccording to
The formula that coefficient is influenced according to forward pull, calculates the influence coefficient of 5# rack forward pullAccording to same step,
Calculate the influence coefficient of 5# rack backward pullIt is as shown in the table:
Step 5: according to above step, the front and back tension for calculating other racks (1#, 2#, 3#, 4#) influences coefficient, will
The forward pull of each rack being calculated influences coefficient and backward pull influences the line chart that coefficient is drawn in tape label respectively, Fig. 2,
Fig. 3 is that each rack entrance tension of high-strength steel M3A25 influences coefficient and exports the tendency chart of tension influence coefficient, and Fig. 4, Fig. 5 are height
Each rack entrance tension of strong steel 51AO1 influences coefficient and exports the tendency chart of tension influence coefficient.
Open-and-shut it can be found out by the above tendency chart, for entrance tension, the entrance tension adjustment of 1# rack
Influence for roll-force is maximum, and the entrance tension adjustment of 4# rack influences minimum for roll-force, therefore, if in order to guarantee
Roll-force steady and when carrying out entrance tension adjustment, can choose the entrance tension of adjustment 4# rack, avoid adjustment 1# rack
Entrance tension.Similarly, for outlet tension, influence of the outlet tension adjustment of 1# rack and 4# rack for roll-force
Very big, influence of the outlet tension adjustment of 2# rack for roll-force is smaller, therefore, if in order to guarantee the steady of roll-force
When carrying out outlet tension adjustment, the outlet tension of adjustment 2# rack can choose, avoid the outlet tension of adjustment 1# rack and 4#.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of tension for improving freedom degree rolling stability influences Coefficient Analysis method, it is characterised in that: comprise the following steps that
(1) rolling data and rolling therory obtained using scene, arranges tube rolling simulation model, obtain roll-force and tension and
Recessive relationship between mill speed, tube rolling simulation model formation are as follows:
Wherein, Rf is roll-force, KfmFor the average deformation drag of strip, LcFor contact arc length, hmFor the average thickness of strip, Tf
And TbThe respectively forward direction tension and backward tension of strip, WenFor strip width, u is coefficient of friction；
(2) actual conditions at scene, the limiting value of versus speed, including equipment is combined to allow maximum value VEmaxAllow most with technique
Big value VTmax, take in the two smaller value as muzzle velocity limiting valueThen limitation is subjected to average equal part, obtained
The velocity amplitude V of each equal part of rack must be exportedi 5, further according to second flow principle, obtain the velocity amplitude V of each racki m, i.e.,
Wherein, h5For milling train exit thickness, hmFor the exit thickness of m rack, n is the speed point quantity formed after equal part；
(3) according to the tube rolling simulation model determined in step (1), in conjunction with velocity amplitude, by Rf=rf (V, h, Tb, Tf, u, Kf,
Wen, Lc...) calculate the different corresponding roll-forces of speed pointAnd allow most high speed when roll-forceThat is:
Wherein: h is steel strip thickness；
(4) rack forward pull variable quantity is givenIt is corresponding after the variation of computer rack forward pull according to tube rolling simulation model
Roll-force
Wherein, V is mill speed；
(5) rack backward pull variable quantity is givenIt is corresponding after the variation of computer rack backward pull according to tube rolling simulation model
Roll-force
(6) according to the roll-force under friction speedRoll-force after the variation of rack forward pullComputer rack
Forward pull influences coefficient eff_Rf_Tf:
(7) according to the roll-force under friction speedRoll-force after the variation of rack backward pullComputer rack
Backward pull influences coefficient eff_Rf_Tb:
2. the tension according to claim 1 for improving freedom degree rolling stability influences Coefficient Analysis method, feature exists
In: the rolling data that scene obtains in the step (1) includes each rack mill speed, each rack front and back tension, each rack band
Steel exit thickness, strip width and mill length.
3. the tension according to claim 1 for improving freedom degree rolling stability influences Coefficient Analysis method, feature exists
In: coefficient of friction in the step (1)
Wherein, u0For friction factor, duvFor coefficient relevant to lubrication, v0For with reference to mill speed, v is mill speed, CRIt is thick
Roughness coefficient, R are gloss level of roll, R0For with reference to roughness, L is accumulative mill length, CwFor the coefficient of waste, L0On the basis of roll
Length processed.
4. the tension according to claim 1 for improving freedom degree rolling stability influences Coefficient Analysis method, feature exists
In: the average deformation drag of strip in the step (1)
Wherein,k0、k1、k2For the coefficient of resistance of deformation, hio、hi1Respectively strip each rack
Inlet thickness and exit thickness, h0For inlet of rolling mill thickness,For rate of deformation.
5. the tension according to claim 1 for improving freedom degree rolling stability influences Coefficient Analysis method, feature exists
In: n is 7 in the step (2).
6. the tension according to claim 1 for improving freedom degree rolling stability influences Coefficient Analysis method, feature exists
In: tension influences coefficient eff_Rf_T before and after the rack in the step (6) and step (7)f、eff_Rf_TbIt is defeated with log mode
Out.
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| CN111014291A (en) * | 2019-12-30 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Control method for rolling model of cold-rolled thin strip steel |
| CN112588840A (en) * | 2020-11-26 | 2021-04-02 | 燕山大学 | Rolling force compensation method and system suitable for cold continuous rolling unit |
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