CN102886383B - Method for controlling mechanical properties of cold-rolling strip steel in online manner - Google Patents

Abstract

The invention relates to a method for controlling the mechanical properties of cold-rolling strip steel in an online manner. The method overcomes the shortage of the current conventional method for monitoring the mechanical properties of the strip steel by inspecting casually and sampling, analyzing and testing in an offline manner and adjusting the production process or material components in the online manner, and reduces the fluctuations of the mechanical properties of the strip steel. The method for controlling the mechanical properties of the strip steel in the online manner is based on a continuous hot dip galvanizing machine set or a continuous annealing machine set of the cold-rolling strip steel and is realized by testing the mechanical properties of the strip steel in the online manner and timely adjusting production process parameters such as flat elongation, annealing heating temperature or annealing cooling speed and the like according to a deviation between a mechanical property testing value and a target value. The method can improve the control accuracy of the mechanical properties of the cold-rolling strip steel and satisfy the requirements of downstream users in a better manner.

Description

A kind of cold-strip steel machinery performance online control method

Technical field

The present invention relates to cold rolling of strip steel technical field, particularly, relate to a kind of cold-strip steel machinery Properties Control method, more specifically, relate to a kind of cold-strip steel machinery performance online control method.

Background technology

Cold-strip steel has any surface finish, smooth, dimensional accuracy is high and the advantage such as good mechanical property, the most rolling of product, and has and dispatch from the factory through being processed into coated steel sheet greatly.Rolling flat cold-rolled sheet production efficiency is high, easy to use, is conducive to following process.Therefore be widely used, replace the hot pack-rolled sheet of same thickness gradually.Wherein, for steel mill, the technical requirement of band steel mechanical performance parameter (as yield strength, tensile strength, fracture elongation and hardness etc.) is considered to very important usually.One of Dai Gangshi steel mill precondition improving its market competitiveness with qualified mechanical performance index is provided to downstream user.

At present, in cold rolled strip steel production practice, to the usual mode that band steel mechanical performance is monitored be, at relevant cold rolling post processing machine set outlet (as continuous annealing unit, Continuous Hot Dip Galvanizing or skin pass mill group etc.), sampling observation sampling is carried out to band steel, then in analytical test laboratory, the mechanical performance parameter that off-line test obtains band steel is carried out to model, and compare with the technical requirement of downstream user.If band steel mechanical performance is discontented with the requirement of sufficient downstream user, then in the works necessary adjustment is carried out to the processing parameter of similar band steel or material alloys elementary composition etc. in subsequent production.And then sampling observation sampling, off-line analysis test, on-line tuning technological parameter or material composition etc., require until the mechanical performance of band steel meets downstream user completely.

But this offline inspection has following deficiency:

1, time-lag effect.The mechanical performance parameter obtained by offline inspection is merely able to limitedly be used to guide production technology adjustment or material composition adjustment, and need band steel to take off from production line, then carry out the detection of specific performance, cannot the band steel on production line be detected immediately;

2, noncontinuity.Traditional offline inspection means generally can only be carried out sampling to the head of coiled strip steel or tail and be detected, and can not ensure to be with steel mechanical performance index everywhere on entire volume length direction to be all within the scope required.

Summary of the invention

For the deficiency that the offline inspection cold-strip steel machinery performance band solving above-mentioned existence is come, reduce the fluctuation of band steel mechanical performance, the object of the present invention is to provide a kind of cold-strip steel machinery performance online control method, described On-Line Control Method is by the mechanical performance of on-line checkingi band steel, and according to the deviate between mechanical performance detected value and desired value to associated production technological parameter (as smooth percentage elongation ε, annealing heating temperature T or annealing cool speed V etc.) adjust in real time, thus the on-line automatic closed-loop control realized cold-strip steel machinery performance, to improve the control accuracy of cold-strip steel machinery performance, meet the requirement of downstream user better.

For achieving the above object, the present invention takes following technical scheme:

A kind of cold-strip steel machinery performance online control method, described cold-strip steel machinery Properties Control equipment comprises the continuous annealing furnace 3, planisher 4 and the mechanical performance detector 5 that are linked in sequence successively, and it is characterized in that, described On-Line Control Method comprises the steps:

(1) the measured value m of the band steel mechanical performance m, mechanical performance detector 5 detected _actwith the desired value m of described band steel mechanical performance _refdiffer from, draw the deviate △ m of described band steel mechanical performance, that is:

△m＝m _act-m _ref

(2) belt steel flating tension adjustment amount, is determined:

According to the band steel mechanical performance deviate △ m obtained in step (1), determine smooth entrance tension adjustment amount △ T respectively ₀with smooth outlet tension adjustment amount △ T ₁;

(3) belt steel flating roll-force regulated quantity, is determined:

According to the band steel mechanical performance deviate △ m obtained in step (1), determine belt steel flating roll-force regulated quantity △ P;

(4), determine to be with steel annealing cool speed regulated quantity △ V or annealing heating temperature regulated quantity △ T:

According to the band steel mechanical performance deviate △ m obtained in step (1), determine annealing cool speed regulated quantity △ V or annealing heating temperature regulated quantity △ T;

(5), determine whether belt steel flating tension adjustment amount or skin pass rolling power regulated quantity export, and step is as follows:

(5a) absolute value of band steel mechanical performance deviate, will obtained in step (1) | the closed-loop control threshold value △ m that △ m| is corresponding to described band steel mechanical performance _limmake comparisons, wherein △ m _lim>0;

Wherein, as | △ m|>=△ m _lim, and belt steel thickness h≤belt steel thickness higher limit h ₀time, forward step (2) adjustment belt steel flating tension force to; When | △ m|>=△ m _lim, and h>h ₀time, forward step (3) adjustment belt steel skin pass rolling power to; When | △ m|< △ m _limtime, without the need to smooth tension force or the skin pass rolling power of adjustment belt steel;

(5b) determination that, in step (2), whether smooth tension adjustment amount exports:

According to belt steel flating percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and smooth entrance tension adjustment amount △ T ₀, smooth outlet tension adjustment amount △ T ₁size, determine △ T ₀, △ T ₁output:

Work as ε _act>=ε _upp, and △ T ₀>0, △ T ₁during >0, go to step (4); Or work as ε _act≤ ε _low, and △ T ₀<0, △ T ₁during <0, go to step (4); Otherwise, export △ T ₀, △ T ₁, go to step (2), continue the smooth tension force of adjustment belt steel;

(5c) determination that, in step (3), skin pass rolling power regulated quantity exports:

According to smooth percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and the size of skin pass rolling power regulated quantity △ P, determine the output of △ P:

Work as ε _act>=ε _upp, and during △ P>0, go to step (4); Or work as ε _act≤ ε _low, and during △ P<0, go to step (4); Otherwise, export △ P, go to step (3), continue the skin pass rolling power of adjustment belt steel;

(6), by adjustment annealing cool speed V or annealing heating temperature T control cincture steel mechanical performance, step is as follows:

(6a), in step (4), if band steel mechanical performance deviate △ m is band steel tensile strength deviate, then adjusts annealing cool speed, go to step (6b); If band steel mechanical performance deviate △ m is band steel hardness deviation value, then adjusts annealing heating temperature, go to step (6c);

(6b), according to band steel annealing cool speed measured value V _act, band steel annealing cool speed allows upper limit V _upp, band steel annealing cool speed allows lower limit V _low, and annealing cool speed regulated quantity △ V, determine whether to export △ V:

Work as V _act>=V _upp, and △ V>0 or V _act≤ V _low, and during △ V<0, without the need to exporting △ V; Otherwise, export △ V, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power;

(6c), according to band steel annealing heating temperature measured value T _act, band steel annealing heating temperature allows upper limit T _upp, band steel annealing heating temperature allows lower limit T _low, and annealing heating temperature regulated quantity △ T, determine whether to export △ T:

Work as T _act>=T _upp, and △ T>0 or T _act≤ T _low, and during △ T<0, without the need to exporting △ T; Otherwise, export △ T, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power.

Wherein, described band steel mechanical performance m is band steel tensile strength sigma _bor band steel hardness H.

Further, smooth entrance tension adjustment amount △ T described in step (2) ₀determine that formula is as follows:

${\mathrm{\&Delta;T}}_0={\mathrm{Gain}}_{{m\_T}_0}\&times;\mathrm{\&Delta;m}/K_{m\_T_0}$

△ T in formula ₀for smooth entrance tension adjustment amount;

for smooth entrance tension force ride gain,

for smooth entrance tension force is to band steel mechanical impact coefficient;

$K_{m\_T_0}=\frac{\&PartialD;m}{\&PartialD;T_0}\&cong;\frac{\&dtri;m}{\&dtri;T_0},$ In formula, for differential operator;

Described smooth outlet tension adjustment amount △ T ₁determine that formula is as follows:

${\mathrm{\&Delta;T}}_1={\mathrm{Gain}}_{{m\_T}_1}\&times;\mathrm{\&Delta;m}/K_{m\_T_1}$

△ T in formula ₁for smooth outlet tension adjustment amount;

for smooth outlet tension force ride gain,

for smooth outlet tension force is to band steel mechanical impact coefficient,

$K_{m\_T_1}=\frac{\&PartialD;m}{\&PartialD;T_1}\&cong;\frac{\&dtri;m}{\&dtri;T_1},$ for differential operator.

Further, the computing formula of the P of belt steel flating roll-force regulated quantity △ described in step (3) is as follows

△P＝Gain _{m_P}×△m/K _{m_P}

In formula, △ P is skin pass rolling power regulated quantity;

Gain _{m_P}for skin pass rolling force control gain, 0<Gain _{m_P}≤ 1.0;

K _{m_P}for skin pass rolling power is to band steel mechanical impact coefficient,

$K_{m\_P}=\frac{\&PartialD;m}{\&PartialD;P}\&cong;\frac{\&dtri;m}{\&dtri;P};$ In formula, for differential operator.

Further, steel annealing cool speed regulated quantity △ V is with described in step (4)

△V＝Gain _V×△m/K _V

In formula, △ V is annealing cool speed regulated quantity;

Gain _vfor annealing cool speed ride gain, 0<Gain _v≤ 1.0;

K _vfor annealing cool speed is to band steel mechanical impact coefficient;

$K_V=\frac{\&PartialD;m}{\&PartialD;V}\&cong;\frac{\&dtri;m}{\&dtri;V},$ for differential operator;

Described annealing heating temperature regulated quantity △ T, computing formula is as follows:

△T＝Gain _{m_T}×△m/K _{m_T}

In formula, △ T is annealing heating temperature regulated quantity

Gain _{m_T}for annealing heating temperature ride gain, 0<Gain _{m_T}≤ 1.0

K _{m_T}for annealing heating temperature is to band steel mechanical impact coefficient,

$K_{m\_T}=\frac{\&PartialD;m}{\&PartialD;T}\&cong;\frac{\&dtri;m}{\&dtri;T},$ for differential operator.

Described belt steel thickness higher limit h ₀for 0.3mm.

According to as above technical scheme, just can provide a kind of cold-strip steel machinery performance online control method, described On-Line Control Method can realize the on-line checkingi to cold-strip steel machinery performance, significantly improves the control accuracy of cold-strip steel machinery performance, reduce material removal amount, improve the lumber recovery of band steel.

Accompanying drawing explanation

Fig. 1 is cold-strip steel machinery performance online control appliance schematic diagram.

Fig. 2 is the curve map of smooth percentage elongation on the impact of band steel hardness.

Fig. 3 is that smooth percentage elongation is to band steel tensile strength influence curve figure.

Fig. 4 is band steel annealing temperature curve figure.

Fig. 5 is that annealing heating temperature is to band steel hardness influence curve figure.

Fig. 6 is that annealing cool speed is to band steel tensile strength influence curve figure.

Fig. 7 is band steel tensile strength On-line Control flow chart.

Fig. 8 is band steel hardness On-line Control flow chart.

In Fig. 1,1, uncoiler 2, band steel 3, continuous annealing furnace 4, planisher 5, mechanical performance detector 6, coiling machine.

Detailed description of the invention

Below in conjunction with accompanying drawing, explanation is further explained to a kind of cold-strip steel machinery performance online control method provided by the invention.

Technical scheme of the present invention is as follows:

The technological process of producing cold-strip steel is substantially as follows: pickling-cold rolling-annealing-smooth-coating, shearing and packaging.Wherein, annealing and the mechanical performance of smooth two techniques to the band steel after cold rolling step have considerable influence.

1, cold-strip steel machinery performance online control appliance

Mechanical performance On-Line Control Method provided by the invention can complete on equipment as shown in Figure 1, as shown in Figure 1, the band steel 2 being transmitted out by uncoiler 1 is after continuous annealing furnace 3 and planisher 4 process, through mechanical performance on-line detector 5, the measured value of the band steel mechanical performance m detected by described mechanical performance on-line detector 5 and the desired value required by downstream user are compared, if meet downstream user requirement, then be with steel 2 smoothly by mechanical performance on-line detector 5, enter coiling machine 6, namely enter coating, shearing and packing stage; If do not meet downstream user requirement, then according to the data of different mechanical performance measured value, by adjusting the related process parameters of annealing furnace 3 or planisher 4, until follow-up band steel mechanical performance m meets downstream user requirement.Wherein, described mechanical performance on-line detector 5 is connected in series with continuous annealing furnace 3 and planisher 4, and described mechanical performance on-line detector 5, based on electromagnetic testing, for contactless, is positioned at medium position on strip width direction.

Wherein, the object of annealing is mainly the process by annealing furnace 3, reduces due to the serious work hardening that plastic deformation is formed in cold rolling process, improves the mechanical performance of band steel.In general, in cold-rolled steel strip continuous annealing process, by adjusting parameter and annealing within the specific limits as the annealing cool speed V after the annealing heating temperature T of band steel or soaking, obviously mechanical performance and processability etc. can be improved.

The smooth object of cold-strip steel is mainly to improve mechanical performance, control panel shape and belt steel surface pattern.In cold-strip steel formation process, planisher 4 is by imposing less plastic deformation (i.e. smooth percentage elongation ε to the band steel after recrystallization annealing, mostly between 0.2% ~ 3%), be with the mechanical performance of steel after annealing can be improved to a certain extent, eliminate yield point elongation.When smooth percentage elongation measured value departs from smooth percentage elongation setting value, by adjustment skin pass rolling power or smooth entrance, outlet strip tension, actual percentage elongation can be made to revert near setting value.In general, for the band steel that thinner thickness, material are harder, smooth percentage elongation is more responsive to smooth warp tension ratio, usually adopts the smooth tensionless mode of adjustment to control smooth percentage elongation; The band steel that, material thicker for thickness is softer, smooth percentage elongation is more responsive to skin pass rolling force rate, usually adopts adjustment skin pass rolling power mode to control smooth percentage elongation.

Described mechanical performance on-line detector 5 is installed on machine set outlet section, after being positioned at planisher 4.Band steel mechanical performance (comprising yield strength, tensile strength, hardness and fracture elongation etc.) after having annealed and smooth process carries out the function detected in real time.Along with band steel travels forward continuously according to certain speed, can detect in real time and obtain being with steel mechanical behavior value (to comprise hardness H, the tensile strength sigma of band steel _bwith yield strength σ _sdeng) and along the situation of change in strip length direction.

2, by the mechanical performance of the automatic control cincture steel of adjustment flattening technological parameter

Theoretical and the production practices according to cold-strip steel skin pass rolling, as shown in Figure 2 and Figure 3, usually, along with smooth percentage elongation increases within the specific limits, band steel hardness, the corresponding increase of tensile strength, vice versa.

Referred to, as the band steel mechanical performance measured value m that mechanical performance detector 5 detects by the strategy of adjustment flattening technological parameter automatic control cincture steel mechanical performance in the present invention _actlower than the band steel mechanical performance desired value m of setting _refwhen exceeding to a certain degree, preferentially, by increasing smooth tension force or skin pass rolling power, increase the smooth percentage elongation ε of band steel, until band steel mechanical performance measured value is close to mechanical performance desired value m _reftill; As the band steel mechanical performance measured value m that mechanical performance detector 5 detects _acthigher than the band steel mechanical performance desired value m of setting _refwhen exceeding to a certain degree, preferentially, by reducing smooth tension force or skin pass rolling power, reduce the smooth percentage elongation of band steel, until band steel mechanical performance measured value m _actclose to mechanical performance desired value m _reftill.

But, be more limited by the scope of adjustment flattening technological parameter mode control cincture steel mechanical performance.As belt steel flating percentage elongation measured value ε _actreach the higher limit of setting and be with steel mechanical performance measured value to be still starkly lower than mechanical performance desired value m _reftime, or when belt steel flating percentage elongation measured value reaches the lower limit of setting and is with steel mechanical performance measured value still apparently higher than mechanical performance desired value, be namely with steel mechanical performance deviate △ m (△ m=m _act-m _ref) absolute value | △ m| exceed setting, the tolerance interval △ m of band steel mechanical performance m required by downstream user _limtime, illustrate and cannot make band steel mechanical performance measured value m by adjustment flattening technological parameter (namely adjust belt steel flating tension force or skin pass rolling power) _actclose to mechanical performance desired value m _ref, now keep flattening technological parameter to stablize, transfer the mechanical performance of the automatic control cincture steel of mode by adjustment continuous annealing process parameter (i.e. annealing cool speed V or annealing heating temperature T).

3, by the mechanical performance of adjustment continuous annealing process parameter On-line Control band steel

Conventional cold-rolled steel strip continuous annealing temperature profile as shown in Figure 4.Theoretical and the production practices according to cold-rolled steel strip continuous annealing, as shown in Figure 5, usually, along with annealing heating temperature raises in certain limit, the corresponding reduction of hardness of band steel, vice versa; As shown in Figure 6, usually, along with annealing cool speed is accelerated in certain limit, the corresponding increase of tensile strength of band steel, vice versa.

Higher product (as cold-rolled tin plate etc.) is required for band steel hardness control accuracy, referred to, as the band steel hardness measured value H that mechanical performance detector 5 detects by the strategy of adjustment continuous annealing process parameter automatic control cincture steel mechanical performance in the present invention _actlower than the band steel hardness desired value H of setting _refwhen exceeding to a certain degree, reduce the annealing heating temperature of band steel, until band steel hardness measured value is close to hardness desired value H _reftill; As the band steel hardness measured value H that mechanical performance detector 5 detects _acthigher than the band steel hardness desired value H of setting _refwhen exceeding to a certain degree, improve the annealing heating temperature T of band steel, until band steel hardness measured value H _actclose to hardness desired value H _reftill.

But, be limited by the scope of the mode control cincture steel hardness H of adjustment annealing heating temperature T.When being with steel hardness measured value still apparently higher than hardness desired value when being with steel annealing heating temperature actual value to reach the higher limit of setting, or when being with steel hardness measured value to be still starkly lower than hardness desired value when being with steel annealing heating temperature actual value to reach the lower limit of setting, illustrate and band steel hardness measured value cannot have been made close to hardness desired value by adjustment annealing heating temperature manner, now keep annealing heating temperature stabilization.

Higher product (as high strength cold-rolled Automobile Plate etc.) is required for band steel tensile strength control accuracy, referred to by the strategy of adjustment continuous annealing process parameter automatic control cincture steel mechanical performance in the present invention, when the band steel tensile strength measured value that mechanical performance detector 5 detects exceedes to a certain degree lower than the band steel tensile strength desired value set, accelerate the annealing cool speed of band steel, until band steel tensile strength measured value is close to tensile strength desired value; When the band steel tensile strength measured value that mechanical performance detector 5 detects exceedes to a certain degree higher than the band steel tensile strength desired value set, reduce the annealing cool speed of band steel, until band steel tensile strength measured value is close to tensile strength desired value.Limited by the scope of adjustment annealing cool speed mode control cincture steel tensile strength.When being with steel tensile strength measured value still apparently higher than tensile strength desired value when being with steel annealing cool speed actual value to reach the higher limit of setting, or when being with steel tensile strength measured value to be still starkly lower than tensile strength desired value when being with steel annealing cool speed actual value to reach the lower limit of setting, illustrate and band steel tensile strength measured value cannot have been made close to tensile strength desired value by adjustment annealing cool speed mode, now keep annealing cool speed to stablize.

Embodiment

Below in conjunction with a kind of cold-strip steel machinery performance online control method provided by the invention, provide the specific embodiment with steel tensile strength and band steel hardness On-line Control in band steel mechanical performance.

Embodiment 1

Require that higher product is as high strength cold-rolled Automobile Plate etc. for band steel tensile strength control accuracy, composition graphs 7, below the implementation step that automatically controls of oolemma steel tensile strength and implementation method specifically.Step is as follows:

(1) determination of steel tensile strength deviation is with

Mechanical performance detector 5 detects the band steel tensile strength measured value σ obtained _{b_act}deduct the tensile strength desired value σ of setting _{b_ref}, obtain band steel tensile strength deviate △ σ _b:

△σ _b＝σ _{b_act}-σ _{b_ref}

△ σ in formula _bfor band steel tensile strength deviate;

σ _{b_ref}for the band steel tensile strength desired value of setting, from unit process control computer L2, determine according to the requirement of downstream user to product.

(2) belt steel flating tension adjustment amount, is determined:

For the band steel of thinner thickness, owing to regulating smooth tension force more effective for the smooth percentage elongation of control cincture steel, preferentially, calculate respectively according to tensile strength deviate and determine smooth entrance tension adjustment amount, smooth outlet tension adjustment amount, by playing tension force to the regulating action of smooth percentage elongation, reaching timely cancellation band steel tensile strength deviation reposefully, realizing the object of high accuracy tensile strength closed-loop control.

For the band steel of thinner thickness, according to the band steel tensile strength deviate △ σ that step (1) is determined _b, calculate respectively and determine smooth entrance tension adjustment amount △ T ₀, smooth outlet tension adjustment amount △ T ₁:

$\mathrm{\&Delta;}{T}_0={\mathrm{Gain}}_{{\mathrm{\&sigma;}}_b\_T_0}\&times;\mathrm{\&Delta;}{\mathrm{\&sigma;}}_b/K_{{\mathrm{\&sigma;}}_b\_T_0}$

△ T in formula ₀for smooth entrance tension adjustment amount

for smooth entrance tension force ride gain,

for smooth entrance tension force is to band steel tensile strength influence coefficient,

( for differential operator), be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

$\mathrm{\&Delta;}{T}_1={\mathrm{Gain}}_{{\mathrm{\&sigma;}}_b\_T_1}\&times;\mathrm{\&Delta;}{\mathrm{\&sigma;}}_b/K_{{\mathrm{\&sigma;}}_b\_T_1}$

△ T in formula ₁for smooth outlet tension adjustment amount

for smooth outlet tension force ride gain,

for smooth outlet tension force is to band steel tensile strength influence coefficient,

( for differential operator), be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

(3) belt steel flating roll-force regulated quantity, is determined:

For the band steel that thickness is thicker, owing to regulating planisher roll-force more effective for the smooth percentage elongation of control cincture steel, preferentially, calculate according to tensile strength deviate and determine skin pass rolling power regulated quantity, by playing skin pass rolling power to the regulating action of smooth percentage elongation, reaching timely cancellation band steel tensile strength deviation reposefully, realizing the object of high accuracy tensile strength closed-loop control.

For the band steel that thickness is thicker, according to the band steel tensile strength deviate △ σ that step (1) is determined _b, calculate and determine skin pass rolling power regulated quantity △ P:

$\mathrm{\&Delta;P}={\mathrm{Gain}}_{{\mathrm{\&sigma;}}_b\_P}\&times;{\mathrm{\&Delta;\&sigma;}}_b/K_{{\mathrm{\&sigma;}}_b\_P}$

In formula, △ P is skin pass rolling power regulated quantity

for skin pass rolling force control gain,

for skin pass rolling power is to band steel tensile strength influence coefficient,

( for differential operator), be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

(4) band steel annealing cool speed regulated quantity △ V, is determined:

When there is the situation that band steel tensile strength measured value cannot have been made close to tensile strength desired value by the whole percentage elongation mode of leveling, calculate according to tensile strength deviate and determine annealing cool speed regulated quantity, by playing the regulating action of annealing cool speed to band steel tensile strength, reaching timely cancellation band steel tensile strength deviation reposefully, realizing the object of high accuracy tensile strength closed-loop control.

According to the band steel tensile strength deviate △ σ that step (1) is determined _b, calculate and determine annealing cool speed regulated quantity △ V:

△V＝Gain _V×△σ _b/K _V

In formula, △ V is annealing cool speed regulated quantity

Gain _vfor annealing cool speed ride gain, 0<Gain _v≤ 1.0

K _vfor annealing cool speed is to band steel tensile strength influence coefficient,

( for differential operator), be the function of band steel matter, specification and parameter and annealing etc., can calculated by theoretical model or be tested and obtain.

(5), determine whether belt steel flating tension adjustment amount or skin pass rolling power regulated quantity export, and step is as follows:

(5a) absolute value of band steel tensile strength deviate, will obtained in step (1) | △ σ _b| the closed-loop control threshold value △ σ corresponding to described band steel tensile strength _{b_lim}(i.e. downstream user acceptable band steel tensile strength scope) makes comparisons, wherein △ σ _{b_lim}>0, generally requires to determine according to band steel tensile strength control accuracy;

Relatively belt steel thickness h and belt steel thickness higher limit h ₀, described belt steel thickness higher limit h ₀for 0.3mm.

Wherein, as | △ σ _b|>=△ σ _{b_lim}, and during belt steel thickness h≤0.3mm, forward step (2) adjustment belt steel flating tension force to; When | △ σ _b|>=△ σ _{b_lim}, and during h>0.3mm, forward step (3) adjustment belt steel skin pass rolling power to; When | △ σ _b| < △ σ _{b_lim}time, without the need to smooth tension force or the skin pass rolling power of adjustment belt steel;

(5b) determination that, in step (2), whether smooth tension adjustment amount exports:

According to belt steel flating percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and smooth entrance tension adjustment amount △ T ₀, smooth outlet tension adjustment amount △ T ₁size, determine △ T ₀, △ T ₁output:

Work as ε _act>=ε _upp, and △ T ₀>0, △ T ₁during >0, go to step (4); Or work as ε _act≤ ε _low, and △ T ₀<0, △ T ₁during <0, go to step (4); Otherwise, export △ T ₀, △ T ₁, go to step (2), continue the smooth tension force of adjustment belt steel;

(5c) determination that, in step (3), skin pass rolling power regulated quantity exports:

According to smooth percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and the size of skin pass rolling power regulated quantity △ P, determine the output of △ P:

Work as ε _act>=ε _upp, and during △ P>0, go to step (4); Or work as ε _act≤ ε _low, and during △ P<0, go to step (4); Otherwise, export △ P, go to step (3), continue the skin pass rolling power of adjustment belt steel;

(6), determine whether annealing cool speed regulated quantity exports, and step is as follows:

According to band steel annealing cool speed measured value V _act, band steel annealing cool speed allows upper limit V _upp, band steel annealing cool speed allows lower limit V _low, and annealing cool speed regulated quantity △ V, determine whether to export △ V:

Work as V _act>=V _upp, and △ V>0 or V _act≤ V _low, and during △ V<0, without the need to exporting △ V; Otherwise, export △ V, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power.

Embodiment 2

Require that higher cold-rolled steel strip products is as tin plate etc. for band steel hardness control accuracy, composition graphs 8, below the implementation step that automatically controls of oolemma steel hardness and implementation method specifically.Step is as follows:

(1) determination of steel hardness deviation is with

Mechanical performance detector 5 detects the band steel hardness measured value H obtained _actdeduct the hardness desired value H of setting _ref, obtain band steel hardness deviation value △ H:

△H＝H _act-H _ref

In formula, △ H is band steel hardness deviation value

H _reffor the band steel hardness desired value of setting, from unit process control computer L2, determine according to the requirement of downstream user to product.

(2) belt steel flating tension adjustment amount, is determined:

For the band steel of thinner thickness, owing to regulating smooth tension force more effective for the smooth percentage elongation of control cincture steel, preferentially, calculate respectively according to hardness deviation value and determine smooth entrance tension adjustment amount, smooth outlet tension adjustment amount, by playing the regulating action of smooth tension force to smooth percentage elongation, reaching timely cancellation band steel hardness deviation reposefully, realizing the object of high accuracy hardness closed-loop control.

For the band steel of thinner thickness, according to the band steel hardness deviation value △ H that step (1) is determined, calculate respectively and determine smooth entrance tension adjustment amount △ T ₀, smooth outlet tension adjustment amount △ T ₁:

${\mathrm{\&Delta;T}}_0={\mathrm{Gain}}_{{H\_T}_0}\&times;\mathrm{\&Delta;H}/K_{H\_T_0}$

△ T in formula ₀for smooth entrance tension adjustment amount

for smooth entrance tension force ride gain,

for smooth entrance tension force is to band steel hardness influence coefficient,

( for differential operator, identical below), be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

${\mathrm{\&Delta;T}}_1={\mathrm{Gain}}_{{H\_T}_1}\&times;\mathrm{\&Delta;H}/K_{H\_T_1}$

△ T in formula ₁for smooth outlet tension adjustment amount

for smooth outlet tension force ride gain,

for smooth outlet tension force is to band steel hardness influence coefficient,

be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

(3) belt steel flating roll-force regulated quantity, is determined:

For the band steel that thickness is thicker, owing to regulating planisher roll-force more effective for the smooth percentage elongation of control cincture steel, preferentially, calculate according to hardness deviation value and determine skin pass rolling power regulated quantity, by playing skin pass rolling power to the regulating action of smooth percentage elongation, reaching timely cancellation band steel hardness deviation reposefully, realizing the object of high accuracy hardness closed-loop control.

For the band steel that thickness is thicker, according to the band steel hardness deviation value △ H that step (1) is determined, calculate and determine skin pass rolling power regulated quantity △ P:

△P＝Gain _{H_P}×△H/K _{H_P}

In formula, △ P is skin pass rolling power regulated quantity

Gain _{h_P}for skin pass rolling force control gain, 0<Gain _{h_P}≤ 1.0

K _{h_P}---skin pass rolling power to band steel hardness influence coefficient,

( for differential operator, identical below), be the function of band steel matter, specification and flattening technological parameter etc., can calculated by theoretical model or be tested and obtain.

(4) band steel annealing heating temperature regulated quantity △ T, is determined

When there is the situation that band steel hardness measured value cannot have been made close to hardness desired value by the whole percentage elongation mode of leveling, calculate according to hardness deviation value and determine annealing heating temperature regulated quantity, by playing the regulating action of annealing heating temperature to band steel hardness, reaching timely cancellation band steel hardness deviation reposefully, realizing the object of high accuracy hardness closed-loop control.

According to the band steel hardness deviation value △ H that step (1) is determined, calculate and determine annealing heating temperature regulated quantity △ T:

△T＝Gain _{H_T}×△H/K _{H_T}

In formula, △ T is annealing heating temperature regulated quantity

Gain _{h_T}for annealing heating temperature ride gain, 0<Gain _{h_T}≤ 1.0

K _{h_T}for annealing heating temperature is to band steel hardness influence coefficient,

( for differential operator), be the function of band steel matter, specification and parameter and annealing etc., can calculated by theoretical model or be tested and obtain.

(5), determine whether belt steel flating tension adjustment amount or skin pass rolling power regulated quantity export, and step is as follows:

(5a) absolute value of band steel hardness deviation value, will obtained in step (1) | the closed-loop control threshold value △ H that △ H| is corresponding to described band steel hardness _lim(i.e. downstream user acceptable band steel hardness range) makes comparisons, wherein △ H _lim>0, generally requires to determine according to band steel hardness control accuracy;

Wherein, as | △ H|>=△ H _lim, and during belt steel thickness h≤0.3mm, forward step (2) adjustment belt steel flating tension force to; When | △ H|>=△ H _lim, and during h>0.3mm, forward step (3) adjustment belt steel skin pass rolling power to; When | △ H|< △ H _limtime, without the need to smooth tension force or the skin pass rolling power of adjustment belt steel;

(5b) determination that, in step (2), whether smooth tension adjustment amount exports:

According to belt steel flating percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and smooth entrance tension adjustment amount △ T ₀, smooth outlet tension adjustment amount △ T ₁size, determine △ T ₀, △ T ₁output:

Work as ε _act>=ε _upp, and △ T ₀>0, △ T ₁during >0, go to step (4); Or work as ε _act≤ ε _low, and △ T ₀<0, △ T ₁during <0, go to step (4); Otherwise, export △ T ₀, △ T ₁, go to step (2), continue the smooth tension force of adjustment belt steel;

(5c) determination that, in step (3), skin pass rolling power regulated quantity exports:

According to smooth percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and the size of skin pass rolling power regulated quantity △ P, determine the output of △ P:

Work as ε _act>=ε _upp, and during △ P>0, go to step (4); Or work as ε _act≤ ε _low, and during △ P<0, go to step (4); Otherwise, export △ P, go to step (3), continue the skin pass rolling power of adjustment belt steel;

(6), determine whether annealing cool speed regulated quantity exports, and step is as follows:

According to band steel annealing heating temperature measured value T _act, band steel annealing heating temperature allows upper limit T _upp, band steel annealing heating temperature allows lower limit T _low, and annealing heating temperature regulated quantity △ T, determine whether to export △ T:

Work as T _act>=T _upp, and △ T>0 or T _act≤ T _low, and during △ T<0, without the need to exporting △ T; Otherwise, export △ T, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power.

Claims (5)

1. a cold-strip steel machinery performance online control method, cold-strip steel machinery Properties Control equipment comprises the continuous annealing furnace (3), planisher (4) and the mechanical performance detector (5) that are linked in sequence successively, it is characterized in that, described On-Line Control Method comprises the steps:

(1) the measured value m of the band steel mechanical performance m, mechanical performance detector (5) detected _actwith the desired value m of described band steel mechanical performance _refdiffer from, draw the deviate Δ m of described band steel mechanical performance, that is:

Δm＝m _act-m _ref

Described band steel mechanical performance m is band steel tensile strength sigma _bor band steel hardness H;

(2) belt steel flating tension adjustment amount, is determined:

According to the band steel mechanical performance deviate Δ m obtained in step (1), determine smooth entrance tension adjustment amount Δ T respectively ₀with smooth outlet tension adjustment amount Δ T ₁;

(3) belt steel flating roll-force regulated quantity, is determined:

According to the band steel mechanical performance deviate Δ m obtained in step (1), determine belt steel flating roll-force regulated quantity Δ P;

(4), determine to be with steel annealing cool speed regulated quantity Δ V or annealing heating temperature regulated quantity Δ T:

According to the band steel mechanical performance deviate Δ m obtained in step (1), determine annealing cool speed regulated quantity Δ V or annealing heating temperature regulated quantity Δ T;

(5), determine whether belt steel flating tension adjustment amount or skin pass rolling power regulated quantity export, and step is as follows:

(5a) absolute value of band steel mechanical performance deviate, will obtained in step (1) | the closed-loop control threshold value Δ m that Δ m| is corresponding to described band steel mechanical performance _limmake comparisons, wherein Δ m _lim>0;

Wherein, as | Δ m|>=Δ m _lim, and belt steel thickness h≤belt steel thickness higher limit h ₀time, forward step (2) adjustment belt steel flating tension force to; When | Δ m|>=Δ m _lim, and h>h ₀time, forward step (3) adjustment belt steel skin pass rolling power to; When | Δ m|< Δ m _limtime, without the need to smooth tension force or the skin pass rolling power of adjustment belt steel;

(5b) determination that, in step (2), whether smooth tension adjustment amount exports:

According to belt steel flating percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and smooth entrance tension adjustment amount Δ T ₀, smooth outlet tension adjustment amount Δ T ₁size, determine Δ T ₀, Δ T ₁output:

Work as ε _act>=ε _upp, and Δ T ₀>0, Δ T ₁during >0, go to step (4); Or work as ε _act≤ ε _low, and Δ T ₀<0, Δ T ₁during <0, go to step (4); Otherwise, export Δ T ₀, Δ T ₁, go to step (2), continue the smooth tension force of adjustment belt steel;

(5c) determination that, in step (3), skin pass rolling power regulated quantity exports:

According to smooth percentage elongation measured value ε _act, belt steel flating percentage elongation allow upper limit ε _upp, belt steel flating percentage elongation allows lower limit ε _low, and the size of skin pass rolling power regulated quantity Δ P, determine the output of Δ P:

Work as ε _act>=ε _upp, and during Δ P>0, go to step (4); Or work as ε _act≤ ε _low, and during Δ P<0, go to step (4); Otherwise, export Δ P, go to step (3), continue the skin pass rolling power of adjustment belt steel;

(6), determine whether annealing cool speed regulated quantity Δ V or annealing heating temperature regulated quantity Δ T exports, and step is as follows:

(6a), in step (4), if band steel mechanical performance deviate Δ m is band steel tensile strength deviate, then adjusts annealing cool speed V, go to step (6b); If band steel mechanical performance deviate Δ m is band steel hardness deviation value, then adjusts annealing heating temperature T, go to step (6c);

(6b), according to band steel annealing cool speed measured value V _act, band steel annealing cool speed allows upper limit V _upp, band steel annealing cool speed allows lower limit V _low, and annealing cool speed regulated quantity Δ V, determine whether to export Δ V:

Work as V _act>=V _upp, and Δ V>0 or V _act≤ V _low, and during Δ V<0, without the need to exporting Δ V; Otherwise, export Δ V, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power;

(6c), according to band steel annealing heating temperature measured value T _act, band steel annealing heating temperature allows upper limit T _upp, band steel annealing heating temperature allows lower limit T _low, and annealing heating temperature regulated quantity Δ T, determine whether to export Δ T:

Work as T _act>=T _upp, and Δ T>0 or T _act≤ T _low, and during Δ T<0, without the need to exporting Δ T; Otherwise, export Δ T, different according to belt steel thickness, go to step (2) or (3), continue adjustment belt steel flating tension force or skin pass rolling power.

2. a kind of cold-strip steel machinery performance online control method according to claim 1, is characterized in that: smooth entrance tension adjustment amount Δ T described in step (2) ₀determine that formula is as follows:

$\mathrm{\&Delta;}{T}_0={\mathrm{Gain}}_{{m\_T}_0}\&times;\mathrm{\&Delta;m}/K_{{m\_T}_0}$

Δ T in formula ₀for smooth entrance tension adjustment amount;

for smooth entrance tension force ride gain, $0<{\mathrm{Gain}}_{{m\_T}_0}\&le;1.0;$

for smooth entrance tension force is to band steel mechanical impact coefficient;

$K_{{m\_T}_0}=\frac{\&PartialD;m}{\&PartialD;T_0}\&cong;\frac{\&dtri;m}{\&dtri;T_0},$ In formula, for differential operator;

Described smooth outlet tension adjustment amount Δ T ₁determine that formula is as follows:

$\mathrm{\&Delta;}{T}_1={\mathrm{Gain}}_{{m\_T}_1}\&times;\mathrm{\&Delta;m}/K_{{m\_T}_1}$

Δ T in formula ₁for smooth outlet tension adjustment amount;

for smooth outlet tension force ride gain, $0<{\mathrm{Gain}}_{{m\_T}_1}\&le;1.0;$

for smooth outlet tension force is to band steel mechanical impact coefficient, $K_{{m\_T}_1}=\frac{\&PartialD;m}{\&PartialD;T_1}\&cong;\frac{\&dtri;m}{\&dtri;T_1},$ for differential operator.

3. a kind of cold-strip steel machinery performance online control method according to claim 1, is characterized in that: the computing formula of the Δ of belt steel flating roll-force regulated quantity described in step (3) P is as follows

ΔP＝Gain _{m_P}×Δm/K _{m_P}

In formula, Δ P is skin pass rolling power regulated quantity;

Gain _{m_P}for skin pass rolling force control gain, 0<Gain _{m_P}≤ 1.0;

K _{m_P}for skin pass rolling power is to band steel mechanical impact coefficient,

$K_{m\_P}=\frac{\&PartialD;m}{\&PartialD;P}\&cong;\frac{\&dtri;m}{\&dtri;P};$ In formula, for differential operator.

4. a kind of cold-strip steel machinery performance online control method according to claim 1, is characterized in that: be with steel annealing cool speed regulated quantity Δ V described in step (4)

ΔV＝Gain _V×Δm/K _V

In formula, Δ V is annealing cool speed regulated quantity;

Gain _vfor annealing cool speed ride gain, 0<Gain _v≤ 1.0;

K _vfor annealing cool speed is to band steel mechanical impact coefficient;

$K_V=\frac{\&PartialD;m}{\&PartialD;V}\&cong;\frac{\&dtri;m}{\&dtri;V},$ for differential operator;

Described annealing heating temperature regulated quantity Δ T, computing formula is as follows:

ΔT＝Gain _{m_T}×Δm/K _{m_T}

In formula, Δ T is annealing heating temperature regulated quantity

Gain _{m_T}for annealing heating temperature ride gain, 0<Gain _{m_T}≤ 1.0

K _{m_T}for annealing heating temperature is to band steel mechanical impact coefficient,

$K_{m\_T}=\frac{\&PartialD;m}{\&PartialD;T}\&cong;\frac{\&dtri;m}{\&dtri;T},$ for differential operator.

5. a kind of cold-strip steel machinery performance online control method according to claim 1, is characterized in that: described belt steel thickness higher limit h ₀for 0.3mm.