CN1269583C - Sheet thickness changing apparatus of continuous rolling mill during rolling - Google Patents

Abstract

To constantly maintain volume flow and stably roll the strip although a deviation between a target thickness value of strip and actual thickness values of the strip is generated by disturbance during a period of time from starting of traveling plate thickness change to finishing of traveling plate thickness change. The apparatus comprises a process computer for outputting a preset target strip thickness at the output side of rolling mills(1), a time required for changing traveling and a target rolling force if a starting point of strip thickness change is a time point when strip(3) reaches the respective rolling mills; a traveling plate thickness change controller(51) for outputting an instructed target strip thickness value and an instructed target rolling force value as approaching actual strip thickness values at the output side of the rolling mills and actual rolling force values of the strip to the target strip thickness and the target rolling force during the time required for changing traveling; automatic strip thickness controllers(52) for controlling a roll gap of the rolling mills according to the instructed target strip thickness value and the instructed target rolling force value, adjusting the strip thickness values at the output side of the rolling mills to the target strip thickness, and outputting the actual strip thickness values and the roll gap while adjusting the strip thickness values at the output side of the rolling mills; and dynamic speed controllers for dynamically changing roll speed of rolling mills at the upstream or downstream side compared with a rolling mill which reaches the strip thickness change time point according to the actual strip thickness values or the roll gap when the strip thickness values are controlled to the target strip thickness by the automatic strip thickness controllers.

Description

The rolling ongoing thickness of slab change device of continuous-rolling

Technical field

The present invention relates to the rolling ongoing thickness of slab change device of continuous-rolling, particularly relate to utilizing and depress compensation control dynamically to changing the control method of thickness of slab in stable rolling the carrying out that velocity compensation is provided towards the volume flow of the target thickness of slab change that is provided.

Background technology

The rolling ongoing thickness of slab change device of existing continuous-rolling is according to material, size and the rolling temperature etc. of rolling stock, before rolling, calculate in advance thickness of slab in rolling the carrying out change before and after each frame send that side plate is thick, mill speed, roll seam, rolling load, rolling load etc., be set in each frame.In rolling beginning, the thickness of slab change starting point of rolling stock arrives the moment of each frame, begin to change the depressing position and the speed of rolls of each frame in regular turn, in the moment of the thickness of slab change terminal point that arrives rolling stock, make the depressing position and the speed of rolls of change beginning become setting value, in the operation of rolling, make the product of different thicknesss of slab.

But, beginning to the process that finishes from the thickness of slab change, if volume flow often keeps setting value, then problem just can not take place, but, keep certain value in order to make volume flow, when changing the speed of rolls in fact because error can take place thickness of slab, if the change additional dynamic correction to setting then can not stably not be rolled processing.Therefore, when changing thickness of slab in rolling carrying out, the change amount of thickness of slab is subjected to bigger restriction in the past.

Thereby, in the rolling ongoing thickness of slab change device of continuous-rolling in the past, arrive the 1st frame with thickness of slab change starting point and play the state of change end point by the whole frames of milling train in the overall process till the 1st support as a stage (stage), on one side management phase numbering calculation stages progress on one side.Again, calculating is set the change amount and is set the product of the corresponding stage progress of change amount with speed at the thickness of slab of each frame, set the product of the corresponding stage progress of change amount to the thickness of slab of each frame setting value with speed, each frame is calculated the summation in all stages, ask the thickness of slab of each frame and the alteration command value of the speed of rolls (seeing for example patent documentation 1, i.e. the 9th page of Fig. 3 of TOHKEMY 2001-293508 communique) with this.

The rolling ongoing thickness of slab change device of existing continuous-rolling, provide as desired value with the thickness of slab and the speed of rolls as mentioned above, control according to this desired value, therefore on because of of the change of factors such as non-uniform temperature, take place under the situation of error, exist and to make the certain problem of volume flow maintenance at thickness of slab.Again, if the thickness of slab error becomes down greatly, problem will take place in then rolling stability.Again,, rolling stability there is not the thick error of platelet that influences, the problem that can make a difference to the precision of sheet material width etc. even exist because the tension force between the frame be not certain value yet.

The present invention makes in order to solve existing problems recited above, its purpose is, the thickness of slab change begins to tailend from rolling carrying out even obtain, because of problems such as interference produce the desired value of thickness of slab and departing from of actual value, also can keep volume flow certain, the continuous-rolling that stably is rolled is rolling carry out in the thickness of slab change device.

Summary of the invention

Continuous-rolling of the present invention is rolling carry out in the thickness of slab change device be, dispose many milling trains continuously along the rolling stock direction of transfer, utilize many milling trains described rolling stock to be rolled processing on one side, change on one side each milling train send out side plate thick and the continuous-rolling speed of rolls is rolling carry out in the thickness of slab change device, possesses the moment that arrives each milling train in the thickness of slab change starting point of rolling stock, export the predefined thick target thickness of slab of side plate of sending, the needed time of change in rolling the carrying out, and the operation of the rolling load of target (process) computer, in rolling carrying out, change in the needed time, the described side actual plate thickness of sending is reached more and more approaching described target thickness of slab of the actual rolling load of described rolling stock and the rolling load of described target, thickness of slab changes control device in rolling the carrying out of export target thickness of slab command value and the rolling load command value of target on one side, roll seam according to target thickness of slab command value and the rolling load command value control of target milling train, to send the thick target thickness of slab that is adjusted into of side plate, the described actual plate thickness in the thick adjustment of side plate and the automatic board thickness control apparatus of described roll seam are sent in output simultaneously, utilize automatic board thickness control apparatus, according to actual plate thickness or the described roll seam when the target thickness of slab is controlled, make in thickness of slab change starting point to reach the upstream side of milling train or the dynamic dynamic speed control device that changes of the speed of rolls of downstream milling train.

Description of drawings

Fig. 1 is the continuous-rolling and the rolling block diagram of carrying out middle thickness of slab change device thereof of expression the invention process form 1.

Fig. 2 is the block diagram of interior each controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 1.

Fig. 3 is illustrated on the continuous-rolling of 5 pedestal screwdown gears, the key diagram of the control flow of the 1st grade of controller 5 when the thickness of slab variation point passes through the 3rd frame.

Fig. 4 is the block diagram of each interior controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 3.

Fig. 5 is the block diagram of each interior controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 4.

Fig. 6 is each interior controller architecture block diagram of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 5.

Fig. 7 is the block diagram of each controller in the 1st grade of controller of expression the invention process form 6 (thickness of slab change device in rolling the carrying out).

Symbol description

1 milling train, frame

2 ring top machines

3 rolling stocks

4 the 2nd grades of operation computers

Thickness of slab change device in 5 the 1st grades of controllers, rolling the carrying out

Thickness of slab change control (FGC) device in 51 rolling the carrying out

52 automatic thickness of slab control (AGC) devices

53,53A, 53B, 53C, 53D dynamic speed control device

531 depress compensation control (DRC) device

532 ring top machine control (Looper Control) devices

533 milling train continuous controls (Mill Successive Control) device

Concrete example

Example 1

Below the example 1 that present invention will be described in detail with reference to the accompanying.Fig. 1 is the continuous-rolling and the rolling block diagram of carrying out middle thickness of slab change device of expression the invention process form 1, and Fig. 2 is the block diagram of each controller in the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 1.

In Fig. 1, configuration ring top machine 2 is sent to the left side with rolling stock 3 from the picture right side between each frame of continuous-rolling 1.

In a single day sensor perceives the thickness of slab change starting point of rolling stock 3 and comes the milling train approaching side, and the 2nd grade of operation computer 4 just is sent to control information the 1st grade of controller 5.The 1st grade of controller 5 controlled each milling train 1 according to the control information that transmits.

The 2nd grade of operation computer 4 as control information to the 1st grade of controller 5 export target thicknesss of slab, rolling load, FGC time (reaching the needed time of desired value) and control parameter for making roll seam, the speed of rolls.

The 1st grade of controller 5 is made of rolling ongoing thickness of slab change control (FGC) device 51, automatic thickness of slab control (AGC) device 52, dynamic speed control device 53 in Fig. 2.

The 2nd grade of operation computer 4 receives thickness of slab and changes starting point by behind the signal of each frame, the output control information, and the 1st grade of controller 5 is for controlling each milling train in the moment of control information input, and the FGC device just started when thickness of slab changed starting point at every turn by frame.

FGC device 51 is by AGC device 52 control roll seams.Also by the dynamic speed control device 53 control speeds of rolls.By these three devices, realize the function of thickness of slab change in rolling the carrying out.

Roll seam in rolling the carrying out in the thickness of slab change control uses AGC controller algorithm built-in in the AGC device of the 1st grade of controller 3 to control.FGC device 51 cooperates the target thickness of slab transfer from the target thickness of slab material rearwards of the material of front, the actual rolling load F, the target thickness of slab h that utilize the RAMP function to change _LargetOutput, actual rolling load F of AGC device 52 usefulness and target thickness of slab h _LargetAs input signal.

Also have, so-called RAMP function is exactly corresponding to the change from the target thickness of slab of the material of front to the target thickness of slab of the material of back, makes the function of target thickness of slab and the corresponding change of rolling load.

Arrive the moment of object frame in thickness of slab change starting point, FGC device 51 changes to the rolling load value of final reality according to the material of front to the input signals to the rolling load of AGC device 52 inputs, the rolling load of target of the material of the back that is gone out by the 2nd grade of operation computer settings mode computation.Also have, the rolling load of target is pre-set in the 1st grade of controller.

Again, in change target rolling load, FGC device 51 is the input signals to the target thickness of slab of AGC device 52 inputs, becomes the target thickness of slab of the material of back from the target thickness of slab of the material of front.

AGC device 52 changes roll seam Δ S according to quilt rolling load of target and target thickness of slab after changing.

The speed of rolls in rolling the carrying out in the thickness of slab change control is controlled by the dynamic speed control device 53 of the 1st grade of controller 5.

Owing to the input signal of dynamic speed control device 53, be the variation of thickness of slab or roll seam, the result be the dynamic speed control device output, be that speed of rolls Δ V also changes, but keeping the volume flow between frame is certain value.

Example 2

Fig. 3 is on the continuous-rolling that 5 pedestal screwdown gears are arranged, and the thickness of slab variation point passes through under the situation of the 3rd frame, the key diagram of the control flow of the 1st grade of controller 5.

Also have, begin from the figure right side here each frame call the 1st frame, the 2nd frame ...

Again, even the number of this control screwdown gear and change and also can consider equally as the frame of control object.

Also have, in Fig. 3, for top described (with reference to Fig. 1) the same parts, be marked with prosign, omit its detailed description.

In Fig. 3, dynamic speed control unit 53 is by depressing compensation control (DRC) device 531 and ring top machine control (Looper control) device 532, milling train continuous control (Mill Successive Control) device 533 formations.

In rolling carrying out of the present invention in the thickness of slab variation, when thickness of slab change starting point for example arrives the i frame, implement the change of depressing of i frame, and to the 2nd grade of operation computer 4 target value set thicknesss of slab change thickness of slab, setting value that simultaneously need not the 2nd grade of operation computer 4, and the value of all calculating with the 1st grade of controller one side is controlled the speed of rolls change amount that is used to keep volume flow.This change enforcement as described below.

Needed control information when as mentioned above, the 2nd grade of operation computer 4 transmit control devices 5 are controlled (the rolling load of the prediction of the thickness of slab of the material of FGC time, back, the material of back, control parameter).

FGC device 51 arrives moment of i frame in thickness of slab change starting point, to the AGC device 52 as object, provides from the target thickness of slab of the material of the back of the 2nd grade of operation computer 4 outputs and the predicted value of rolling load.AGC device 52 is being replaced by behind the target thickness of slab and the rolling load of prediction of the material of the back of FGC device 51 outputs the change roll seam from the target thickness of slab of the material of the front that is used in thickness of slab control up to now and actual rolling load always.

But when changing, utilize the RAMP function of FGC device 51, require official hour, shift to desired value linearly and change.

AGC device 52 is in the control roll seam, and the mode that adopts according to dynamic speed control device 53 is depressed actual plate thickness that 531 outputs of compensation control (DRC) device change to the change terminating point from thickness of slab change starting point, promptly surveyed thickness of slab (thickness of slab that pachometer records) h to dynamic speed control device 53 _GM, depressing position change amount and plastic coefficient change amount etc.

AGC device 52 between the change terminating point, is exported actual plate thickness (thickness of slab that the thickness instrumentation gets) h in thickness of slab change starting point successively _GM, depressing position change amount, plastic coefficient change amount, rolling load the state at every moment of actual value etc.

Dynamic speed control device 53 is because the variation of the mass flow (thickness of slab * plate speed) of the upstream side of close thickness of slab change starting point is to keep mass flow necessarily to change the plate speed of upstream side.Also have, downstream side is owing to also proceeding the rolling of material that go ahead of the rest, so the speed of downstream side does not change.

In case from AGC device 52 output actual plate thickness (thickness of slab that the thickness instrumentation gets) h _GM, depressing position change amount and plastic coefficient change amount etc., DRC device 531 just calculates the correction (with the deviation of the present speed of rolls) of the speed of rolls according to this tittle.

Also have, ring top machine control device 532 encircles top machine 2 detected moments of torsion according to utilizing, the tension force of plate between the computer rack, and breaker roll speed correction compensates.

In case for example the moment of torsion between the 2nd to the 3rd frame rises, then the tension force of plate also just rises between the 2nd to the 3rd frame.The tension force of ring top machine control device 532 plate between the 2nd frame to the 3 frames descends the tension force of the plate between the 2nd frame and the 3rd frame in case rising just slows down the speed of rolls (speed of rolls of the 3rd frame is constant) of the 2nd frame slightly.

Again, the correction of the speed of rolls of calculating by DRC device 531, again with correction addition with the speed of rolls of ring top machine control device 532 compensation after, to the correction of the milling train continuous control device 533 output speeds of rolls of the control speed of rolls.

Milling train continuous control device 533 changes the speed of upstream side frame simultaneously with same ratio, so that the balance of the transfer rate of rolling stock 3 is constant.

Suppose that for example the speed of the 3rd frame only falls 5% after rise.The 3rd gantry speed is in case constant after falling after rise, and then the tension force of the plate between the 2nd frame～the 3rd frame slows down, and can not average out, and therefore must make the speed of the 2nd, the 1st frame all fall 5% simultaneously after rise, controls this speed with this.

Like this, ring top machine control device 532 is often monitored tension force and is regulated the speed of rolls, utilizes the speed of rolls of milling train continuous control device 533 each frame of control, so just can obtain the operation of mass flow balance.

Like this, by thickness of slab modification control method this a succession of action being applicable to from thickness of slab change starting point to rolling the carrying out of terminating point, do not need setting calculated value, can comprise actual error, dynamically determine the speed of rolls according to setting model (setup model).

Also have, because erection rate successively dynamically, so can carry out stable operation, the thickness of slab change begins between stopping in rolling carrying out, even depart from owing to disturb the desired value make thickness of slab and actual value to produce, also can keep volume flow certain, can stablize and be rolled.

Also have, by utilizing these devices, this a succession of action is applicable to thickness of slab modification control method from thickness of slab change starting point to terminating point, control system is stable, compared with the past, can improve the compliance of gap translational speed, the gradient in the time of reducing the thickness of slab change is partly.Thereby the raising of utilization rate of raw materials is apparent.

Moreover, because speed control system is stable, compared with the past, can strengthen the gap amount of movement, can select the collocation of the material of the material of front and back more colorfully.

Also have, described above is the speed of rolls that changes the upstream side frame of the frame that thickness of slab change starting point passes through, but also can consider to adopt the mode of change downstream side.With last frame is the benchmark of speed, change the speed of rolls of frame of upstream side and the method that balance is maintained in view of the above, and be the benchmark of speed with the 1st frame, change the method for the speed of rolls of the frame in downstream in view of the above, no matter any can enforcement.This example is that the speed with last frame is the method that benchmark changes the upper reaches frame.

Example 3

Fig. 4 is the block diagram of each interior controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 3.

In Fig. 4, for the identical part in front (with reference to Fig. 2), be marked with identical symbol or add A in the symbol back, omit its explanation.

As shown in Figure 4, the computational methods as the speed of rolls correction of depressing compensation arrangement 531 of dynamic speed control device 53A can adopt the principle certain according to volume flow, ask the mode (Δ h mode) of speed of rolls correction from the thickness of slab variation.

This is the mode that always the computational speed correction is used when keeping certain target thickness of slab, utilizes the method for replacing desired value, can be used as the use of the part of FGC device.

This calculating formula is following formula (1)～(5).

[several 1]

$\frac{{\mathrm{\ΔV}}_n\left(t\right)}{V_n}=-\frac{1-r_n}{C_n+r_n}(\frac{{\mathrm{\ΔH}}_n\left(t\right)}{H_n}-\frac{{\mathrm{\Δh}}_n\left(t\right)}{h_n})$

$+\frac{1-r_{n+1}}{C_{n+1}+r_{n+1}}(\frac{{\mathrm{\ΔH}}_{n+1}\left(t\right)}{H_{n+1}}-\frac{{\mathrm{\Δh}}_{n+1}\left(t\right)}{h_{n+1}})-\frac{{\mathrm{\ΔH}}_{n+1}\left(t\right)}{H_{n+1}}-\frac{{\mathrm{\Δh}}_{n+1}\left(t\right)}{h_{n+1}}\·\·\·\left(1\right)$

ΔV _n(t)＝V _n(t)-V _n ...(2)

ΔH _n(t)＝H _n(t)-H _n ...(3)

Δh _n(t)＝h _n(t)-h _N ...(4)

$r_n=\frac{H_n-h_n}{H_n}\·\·\·\left(5\right)$

Here, H _n(t), h _n(t), V _n(t) be respectively at every moment all and changing, the n frame go into side thickness of slab (follow the tracks of the fixed thickness of slab of thickness instrumentation of last frame, mm), go out side plate thick (thickness of slab that the thickness instrumentation gets, mm), the speed of rolls; H _n, h _n, V _nRepresent its a reference value.H _n, h _nUse by fixed value of thickness of slab instrumentation or the value of utilizing thickness measure (gaugemeter) formula to calculate.

Also has Δ H _n, Δ h _n, r _n, C _nExpression is gone into the thick deviation of side plate (=currency-Lock ON value) [mm], is gone out the thick deviation of side plate (=currency-Lock ON value) [mm], reduction ratio [-], advancing slip rate coefficient (f=r respectively _n/ C _n) [-].

The manner is the formula that theory is derived, and is effective to various interference.Rolling ongoing change, usually in stable as-rolled condition, implement, therefore in rolling carrying out, carry out pinning a moment before changing, controlled quentity controlled variable and actual value are stored in the memory, carry out the speed correction according to the speed of rolls correction that calculates, just can carry out suitable control.

Like this, calculate speed of rolls correction, just can carry out suitable control according to the thickness of slab variation.

Example 4

Fig. 5 is the block diagram of each interior controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 4.

At Fig. 5, for top described (with reference to Fig. 2) identical part, be marked with additional " B " behind prosign or the symbol detailed.

As shown in Figure 4, as the computational methods of depressing the speed of rolls correction in the compensation arrangement 531 of dynamic speed control device 53A, can adopt the variation in breaker roll gap only to consider that milling train constant and plastic coefficient ask the mode of speed of rolls correction (Δ s mode).

This is always when keeping certain target thickness of slab, is used for calculating the mode of the correction of the speed of rolls, can utilize the switching target value, uses as the part of FGC device.

This computing formula is following formula (6) and formula (7).

[several 2]

$\frac{{\mathrm{\ΔV}}_n\left(t\right)}{V_n}=\frac{1}{h_{n+1}}\·\frac{M_{n+1}}{M_{n+1}+Q_{n+1}}\·\mathrm{\Δ}{S}_{n+1}\left(t\right)\·\·\·\left(6\right)$

ΔS _n(t)＝S _n(t)-S _n

...(7)

Also has Δ S _n(t) be the depressing position of the n frame that at every moment changes, S _nRepresent its a reference value.Also has M _nExpression milling train constant (setting value) [ton/mm],

(several 3)

Q _n

Q _nExpression plastic coefficient (setting value) (ton/m).Δ S _nExpression roll seam deviation (=currency-LockOn value) (mm).

In the Δ h mode shown in the above-mentioned example 3, under the very unstable situation of as-rolled condition, the error of the thickness of slab that the thickness instrumentation gets is a main cause, and the situation that can not obtain true thickness of slab value is arranged, under the opposite extreme situations, may occur and the opposite polarity situation of speed correction.In contrast, in the manner, owing to determine speed of rolls correction with respect to the variation of roll seam, necessary speed correction must be that polarity is consistent with the roll seam variation.Control by the manner,, compare, more may obtain stable mode of operation with Δ h mode though abandoned the tightness of the absolute value of speed correction.

Example 5

Fig. 6 is each interior controller architecture block diagram of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 5.

In Fig. 6, to top described (with reference to Fig. 2) identical part, give identical symbol or add " C " in the symbol back, omit its detailed description.

In the above-mentioned example 4, computational methods as the speed of rolls correction of depressing penalty method control device 531, narrated according to depressing position change amount from a certain benchmark, calculating is depressed compensation method to the Δ S mode of the correction of the speed of rolls of (n-1) frame, depress the speed of rolls modification method of penalty method for Δ S mode, also consider to go into the plastic coefficient change of thick change of side plate and rolling stock, improvement has carried out improveing (modified form Δ S mode) in logic.

Change prime milling train to go out side plate thick so that to cause by this change n～(n+1) change of the mass flow balance between frame can be made the speed of rolls correction of corresponding n frame again.

Also have,, can carry out suitable speed of rolls correction again, make it to carry out stable rolling processing at n～(n+1) change of the mass flow between frame of the plastic coefficient situation of change of rolling stock.

With milling train constant M, rolling stock plastic coefficient Q (t), depressing position S (t), go into formula that the thick H of side plate (t) gives expression to the thick change of side plate h (t) as the formula (8).

[several 4]

$h\left(t\right)=\frac{M}{M+Q\left(t\right)}S\left(t\right)+\frac{M}{M+Q\left(t\right)}H\left(t\right)\·\·\·\left(8\right)$

Formula (8) utilizes a certain a reference value and expresses with respect to the change of a reference value, then draws following formula (9) and (10).In formula (9) and (10), Q (t) is the plastic coefficient that changes constantly, and Q is its a reference value.

[several 5]

$h+\mathrm{\Δh}\left(t\right)=\frac{M}{M+Q+\mathrm{\ΔQ}\left(t\right)}(S+\mathrm{\ΔS}\left(t\right))+\frac{Q+\mathrm{\ΔQ}\left(t\right)}{M+Q+\mathrm{\ΔQ}\left(t\right)}(H+\mathrm{\ΔH}\left(t\right))\·\·\·\left(9\right)$

ΔQ(t)＝Q(t)-Q

...(10)

The denominator, the molecule that remove the right of formula (9) with (M+Q) just obtain following formula (11).

[several 6]

$h+\mathrm{\&Delta;h}\left(t\right)=\frac{\frac{M}{M+\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}}{1+\frac{\mathrm{\&Delta;Q}\left(t\right)}{M+Q}}(S+\mathrm{\&Delta;S}\left(t\right))+\frac{\frac{Q}{M+\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}}{1+\frac{\mathrm{\&Delta;Q}\left(t\right)}{M+Q}}(H+\mathrm{\&Delta;H}\left(t\right))+\frac{\frac{\mathrm{\&Delta;Q}\left(t\right)}{M+\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}}{1+\frac{\mathrm{\&Delta;Q}\left(t\right)}{M+Q}}(H+\mathrm{\&Delta;H}\left(t\right))\&CenterDot;\&CenterDot;\&CenterDot;\left(11\right)$

Again, consider (several 7),

[several 7]

1/{ΔQ(t)/(M+Q)＜＜1

Adopt Taylor expansion, remain into till the quadratic term, get formula (12).

[several 8]

$h+\mathrm{\&Delta;h}\left(t\right)=\frac{M}{M+Q}S+\frac{Q}{M+Q}H$

$+\frac{M}{M+Q}\mathrm{\&Delta;S}\left(t\right)+\frac{Q}{M+Q}\mathrm{\&Delta;H}\left(t\right)$

$+\frac{M}{{(M+Q)}^2}\{(H+\mathrm{\&Delta;H}\left(t\right))-(S+\mathrm{\&Delta;S}\left(t\right))\}\&CenterDot;(\mathrm{\&Delta;Q}\left(t\right)-\frac{\mathrm{\&Delta;}{Q\left(t\right)}^2}{M+Q})\&CenterDot;\&CenterDot;\&CenterDot;\left(12\right)$

According to formula (12), drafts change Δ S (t), go into that the thick change Δ of side plate H (t), rolling stock plastic coefficient change Δ Q (t) cause go out the thick change Δ of side plate h (t) as shown in the formula shown in (13).

[several 9]

$\mathrm{\&Delta;h}\left(t\right)=\frac{M}{M+Q}\mathrm{\&Delta;S}\left(t\right)+\frac{Q}{M+Q}\mathrm{\&Delta;H}\left(t\right)$

$+\frac{M}{{(M+Q)}^2}(H\left(t\right)-S\left(t\right))\&CenterDot;(\mathrm{\&Delta;Q}\left(t\right)-\frac{\mathrm{\&Delta;}{Q\left(t\right)}^2}{M+Q})\&CenterDot;\&CenterDot;\&CenterDot;\left(13\right)$

Wherein, H (t)=H+ Δ H (t), S (t)=S+ Δ S (t).

In formula (13) substitution formula (1), obtain following formula (14).

[several 10]

$\frac{{\mathrm{\&Delta;V}}_n\left(t\right)}{V_n}=\frac{1}{h_{n+1}}\{\frac{M_{n+1}}{M_{n+1}+Q_{n+1}}\mathrm{\&Delta;}{S}_{n+1}\left(t\right)+\frac{Q_{n+1}}{M_{n+1}+Q_{n+1}}{\mathrm{\&Delta;H}}_{n+1}\left(t\right)$

$+\frac{M_{n+1}}{{(M_{n+1}+Q_{n+1})}^2}(H_{n+1}\left(t\right)-S_{n+1}\left(t\right))\&CenterDot;({\mathrm{\&Delta;Q}}_{n+1}\left(t\right)-\frac{{\mathrm{\&Delta;Q}}_{n+1}{\left(t\right)}^2}{M_{n+1}+Q_{n+1}})\}-\frac{{\mathrm{\&Delta;H}}_{n+1}\left(t\right)}{H_{n+1}}$

$+\frac{1-r_{n+1}}{C_{n+1}+r_{n+1}}(\frac{{\mathrm{\&Delta;H}}_{n+1}\left(t\right)}{H_{n+1}}-\frac{{\mathrm{\&Delta;h}}_{n+1}\left(t\right)}{h_{n+1}})-\frac{1-r_n}{C_n+r_n}(\frac{{\mathrm{\&Delta;H}}_n\left(t\right)}{H_n}-\frac{{\mathrm{\&Delta;h}}_n\left(t\right)}{h_n})\&CenterDot;\&CenterDot;\&CenterDot;\left(14\right)$

The the 3rd, 4 of formula (14) is thick and go out the item of the thick expression sliding ratio of side plate to go into side plate.Therefore these are about the item of sliding ratio, because compare very for a short time with 1,2 of following formulas, even ignore the problem that also has nothing special, the such speed correction of following formula (15) also can.

[several 11]

$\frac{{\mathrm{\&Delta;V}}_n\left(t\right)}{V_n}=\frac{1}{h_{n+1}}\{\frac{M_{n+1}}{M_{n+1}+Q_{n+1}}\mathrm{\&Delta;}{S}_{n+1}\left(t\right)+\frac{Q_{n+1}}{M_{n+1}+Q_{n+1}}{\mathrm{\&Delta;H}}_{n+1}\left(t\right)$

$+\frac{M_{n+1}}{{(M_{n+1}+Q_{n+1})}^2}(H_{n+1}\left(t\right)-S_{n+1}\left(t\right))$

$({\mathrm{\&Delta;Q}}_{n+1}\left(t\right)-\frac{{\mathrm{\&Delta;Q}}_{n+1}{\left(t\right)}^2}{M_{n+1}+Q_{n+1}})\}-\frac{{\mathrm{\&Delta;H}}_{n+1}\left(t\right)}{H_{n+1}}\&CenterDot;\&CenterDot;\&CenterDot;\left(15\right)$

Example 6

Fig. 7 is the block diagram of each interior controller of the 1st grade of controller (thickness of slab change device in rolling the carrying out) of expression the invention process form 6.

Among Fig. 7,, give identical symbol or behind symbol additional " D ", omit its detailed description with top described (with reference to Fig. 2) the same part.

As shown in Figure 7, as the computational methods of the speed of rolls correction of depressing penalty method control device 531, can adopt above-mentioned example 5 described modified form Δ s modes.The effect of the manner is illustrated as example 5, the going out in the big rolling ongoing thickness of slab change of the thick change of side plate and plastic coefficient change of prime frame, and its effect shows significantly especially.In usually rolling, because interference etc. are former thereby thickness of slab that produce changes, also have thickness of slab to control effect, the thickness of slab change is tens of microns.

On the other hand, because change about 200 microns is also arranged on the thinnest last frame of rolling stock, so compare the big order of magnitude of thickness of slab change amount when thickness of slab changes in rolling carrying out with common thickness of slab change when rolling.Therefore, when thickness control system is worked, can adopt the thickness of slab command value that changes because of thickness of slab change in rolling the carrying out replace in the above-mentioned formula to go into side plate thick.

Again, for the rolling stock plastic coefficient, the rolling stock plastic coefficient after equally also adopting in rolling the carrying out before changing, only according to thickness of slab change pattern in rolling the carrying out, the plastic coefficient that changes to the material of back from the plastic coefficient of the material of front gets final product.In this case, formula (15) becomes following formula (16)～(18).

[several 12]

$\frac{{\mathrm{\&Delta;V}}_n\left(t\right)}{V_n}=\frac{1}{h_{n+1,A}}\{\frac{M_{n+1}}{M_{n+1}+{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}\mathrm{\&Delta;}{S}_{n+1}\left(t\right)+\frac{{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}{M_{n+1}+Q_{n+1}}\mathrm{\&Delta;}{H_{n+1}}^{*}\left(t\right)$

$+\frac{M_{n+1}}{{(M_{n+1}+Q_{n+1})}^2}({H_{n+1}}^{*}\left(t\right)-S_{n+1}\left(t\right))\&CenterDot;(\mathrm{\&Delta;}{{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}^{*}\left(t\right)-\frac{\mathrm{\&Delta;}{{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}^{*}{\left(t\right)}^2}{M_{n+1}+{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}})\}-\frac{\mathrm{\&Delta;}{H_{n+1}}^{*}\left(t\right)}{{H_{n+1,A}}^{*}}\&CenterDot;\&CenterDot;\&CenterDot;\left(16\right)$

${{\mathrm{\&Delta;H}}_n}^{*}\left(t\right)={H_n}^{*}\left(t\right)-{H_{n,A}}^{*}\&CenterDot;\&CenterDot;\&CenterDot;\left(17\right)$

${{\mathrm{\&Delta;Q}}_n}^{*}\left(t\right)={Q_n}^{*}\left(t\right)-Q_{n,A}\&CenterDot;\&CenterDot;\&CenterDot;\left(18\right)$

In formula (16), Fu Jia symbol *'s is command value above, and what add letter " A " is to be set at the setting value that the material of front calculates.

But, being applicable in rolling the carrying out thickness of slab when change, on the frame of upstream side, sliding rate will have very big variation before can easily imagining, so this frame is necessary to note.

When formula (16) derives, the hypothesis shown in the following formula is arranged, promptly

[several 13]

1/{ΔQ(t)/(M+Q)＜＜1

But, preferably consider Δ Q (t) when calculating speed of rolls correction as the frame of downstream because Δ Q alters a great deal ²(secondary small), otherwise and little in the plasticity change of upstream frame, even thereby ignore also no problem.

Thick about going into side plate, in thickness of slab presumed value such as pachometer formulas or be provided with under the situation of thickness of slab sensor, also can use this measured value.

Again, about the rolling stock plastic coefficient, also can with plastic coefficient as rolling load, go into side plate thick, go out the thick function of side plate, be ready to its numerical value for using as form in advance.

Can shown in (19), obtain again.

[several 15]

$Q^{*}\left(t\right)=\frac{F\left(t\right)}{H\left(t\right)-h\left(t\right)}\&CenterDot;\&CenterDot;\&CenterDot;\left(19\right)$

Depress beyond the time that the structure of compensate control apparatus 531 changes when rolling with Δ S mode to depress compensate control apparatus identical, therefore from the material of front when rolling through needn't handover control system in the time till rolling during change rolling to subsequent material, just can make the balance and stabilityization of mass flow in a like fashion.Therefore, can not take place because control system is switched the error that causes.And owing to needn't prepare the common control system of using during change thickness when rolling and in rolling the carrying out, general structure that can simplification device.

Can in whole frames, ignore again

ΔQ(t) ²

Shown in the formula (20) of project, the new importing adjusted gain G h.

[several 17]

$\frac{{\mathrm{\&Delta;V}}_n\left(t\right)}{V_n}=\frac{G_h}{h_{n+1,A}}\{\frac{M_{n+1}}{M_{n+1}+{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}\mathrm{\&Delta;}{S}_{n+1}\left(t\right)+\frac{{\mathrm{<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}}{M_{n+1}+Q_{n+1}}\mathrm{\&Delta;}{H_{n+1}}^{*}\left(t\right)$

$+\frac{M_{n+1}}{M_{n+1}+Q_{n,A+1}}({H_{n+1}}^{*}\left(t\right)-S_{n+1}\left(t\right))\&CenterDot;{\mathrm{\&Delta;<figure-callout\; id="1"\; label="Q\; n\; +"\; filenames="C0315931600181.png,C0315931600231.png"\; state="\{\{state\}\}">Q</figure-callout>}}_{n+}\left(t\right)\}-\frac{\mathrm{\&Delta;}{H_{n+1}}^{*}\left(t\right)}{{H_{n+1,A}}^{*}}\&CenterDot;\&CenterDot;\&CenterDot;\left(20\right)$

The invention effect

As mentioned above, adopt words of the present invention, owing to possess: the thickness of slab change starting point at rolling stock reaches To the moment of each milling train, export the predefined change institute in the thick target thickness of slab of side plate, rolling the carrying out that sends The time that needs and the 2nd grade of operation (process) computer of the rolling load of target, advance rolling In the row in the needed time of change, use the side actual plate thickness on one side and reach actual rolling load to rolling stock More and more near target thickness of slab and the rolling load of target, on one side export target thickness of slab command value and rolling load refer to Thickness of slab change control device during the value of order rolling carries out, according to target thickness of slab command value and rolling load command value The roll seam of control milling train will go out the thick target thickness of slab that is adjusted into of side plate, export out simultaneously in the thick adjustment of side plate Actual plate thickness and the automatic board thickness control apparatus of roll seam, utilize automatic board thickness control apparatus, according to Actual plate thickness or the roll seam in target thickness of slab when control make the upper of the milling train that arrives in thickness of slab change starting point The dynamic speed control device that the speed of rolls of the milling train in trip or downstream dynamically changes, plate from rolling carrying out Thick change begins between finishing, even the thickness of slab desired value that produces because of problems such as interference and actual value is inclined to one side From, can keep again volume flow is certain value, can carry out stable rolling. Can obtain continuous-rolling Rollingly carry out middle sheet thickness.

Claims (6)

1. rolling ongoing thickness of slab change device of continuous-rolling, this device disposes many milling trains continuously along the rolling stock direction of transfer, utilize described many milling trains to send the thick and speed of rolls of side plate to what described rolling stock was rolled that processing changes described each milling train on one side on one side, it is characterized in that possessing

Arrive moment of described each milling train in the thickness of slab of described rolling stock change starting point, export the predefined described operation computer of sending needed time of change in the thick target thickness of slab of side plate, rolling the carrying out and the rolling load of target,

In described rolling carrying out, change in the needed time, make on one side described send the side actual plate thickness and to the actual rolling load of described rolling stock more and more near described target thickness of slab and the rolling load of described target, on one side thickness of slab change control device in rolling the carrying out of export target thickness of slab command value and the rolling load command value of target,

Control the roll seam of described milling train according to described target thickness of slab command value and the rolling load command value of described target, send with described that side plate is thick to be adjusted into described target thickness of slab, export simultaneously the described automatic board thickness control apparatus of sending described actual plate thickness in the thick adjustment of side plate and described roll seam and

According to the described actual plate thickness from described automatic board thickness control apparatus to the control of described target thickness of slab or the described roll seam that utilize, the dynamic speed control device that the speed of rolls of the milling train in the upstream of the milling train that arrives in described thickness of slab change starting point or downstream is dynamically changed.

2. the rolling ongoing thickness of slab change device of continuous-rolling according to claim 1 is characterized in that, comprises

According to described actual plate thickness or described roll seam, thickness of slab changed in time till the desired effluxion calculating from described thickness of slab change starting point to described rolling carrying out, make volume flow keep certain usefulness speed of rolls correction depress the compensation control device, and

According to described speed of rolls correction, the continuous control means that the speed of rolls of the milling train in the upstream side of the milling train that described thickness of slab variation point begins to arrive or downstream is changed simultaneously.

3. the rolling ongoing thickness of slab change device of continuous-rolling according to claim 2, it is characterized in that, described depress the compensation control device according to arrive from described thickness of slab change starting point the time be carved into the variation of the actual plate thickness in time till thickness of slab described rolling the carrying out changes desired effluxion, calculate the correction of the described speed of rolls.

4. the rolling ongoing thickness of slab change device of continuous-rolling according to claim 2, it is characterized in that, described depress the compensation control device according to arrive from described thickness of slab change starting point the time be carved into variation, milling train constant and the plastic coefficient of described roll seam in time till thickness of slab described rolling the carrying out changes desired effluxion, calculate the correction of the described speed of rolls.

5. the rolling ongoing thickness of slab change device of continuous-rolling according to claim 4, it is characterized in that, the described variation of going into thick variation of side plate and described plastic coefficient of depressing the compensation control device according to described rolling stock calculates the described speed of rolls correction that described volume flow is kept certain usefulness.

6. the rolling ongoing thickness of slab change device of continuous-rolling according to claim 5, it is characterized in that, described depress the compensation control device according to arrive from described thickness of slab change starting point the time be carved into the variation of going into thick variation of side plate and described plastic coefficient of the described rolling stock in time till thickness of slab described rolling the carrying out changes desired effluxion, calculate the correction of the described speed of rolls.

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