CN103962393A - Strip steel thickness feedforward control method based on strip steel performance detection - Google Patents

Abstract

The invention discloses a strip steel thickness feedforward control method based on strip steel performance detection. The method comprises the steps that (1) the models of a performance detector 6 and a thickness gauge 7 are determined; (2) the performance detector and the thickness gauge are installed; (3) a current steel coil thickness control coefficient is obtained; (4) strip steel thickness feedforward control information is obtained; (5) the strip steel thickness feedforward control information is stored; (6) the strip steel thickness feedforward control quantity is calculated, wherein in the rolling process of corresponding strip steel segments, corresponding deformation resistance fluctuating values and thickness fluctuating values are read from a storage unit, and the rolling control quantity is calculated according to a strip steel thickness feedforward control algorithm; (7) real-time thickness feedforward control is conducted, wherein the rolling control quantity is sent to a thickness control executing mechanism, and then real-time thickness feedforward control is completed. By means of the method, the plate thickness quality of a cold-rolled strip steel product can be improved.

Description

A kind of strip steel thickness feedforward control method detecting based on strip property

Technical field

The present invention relates to cold strip tandem field, a kind of strip steel thickness feedforward control method detecting based on strip property.

Background technology

Developing rapidly of modern industry produced and had higher requirement band steel, and thickness of slab is one of important indicator of weighing strip quality always, its fine or not degree direct influence is to lumber recovery and the market competitiveness of product, so the ups and downs that method for controlling thickness is studied for China's steel industry have great importance.

The thick difference of incoming band steel is to cause cold-strip steel finished product to produce the major reason of thick difference, and in prior art, tandem mills generally disposes calibrator before frame, is used for directly measuring the thick difference of incoming band steel and carries out thickness FEEDFORWARD CONTROL.The automatic thickness control system of most cold continuous rolling only carries out FEEDFORWARD CONTROL to the thick difference of band steel entrance incoming band steel, and the thick poor problem of finished strip of bringing due to incoming band steel one-tenth-value thickness 1/10 deviation is well solved.

Certain section have aberrations in property with steel, enter different milling train time be rolled all producing new band steel thick poorly, that is, the performance inconsistency of incoming band steel has repeating transmission to the impact with the thick difference of steel.Development and application along with detection technique, the real-time detection of strip property has become possibility, origin material strip property detected value and deformation condition can obtain corresponding resistance of deformation value, but, existing Steel Rolling Control is not still introduced incoming band steel Performance Detection and is carried out belt steel thickness control, the band steel finished product thickness value deviation that causes the fluctuation of incoming band steel performance to cause, can not effectively be eliminated.

In prior art, for five milling train tandem mills, more system the 3rd milling train does not generally carry out belt steel thickness and automatically controls, therefore utilize the actual measurement roll-force of the 3rd milling train, according to roll-force formula, obtain each section strip steel resistance of deformation value, then utilize resistance of deformation value computing formula obtain the 4th and during the 5th mill milling with the resistance of deformation value of steel, thereby at the 4th and the 5th milling train, carry out belt steel thickness FEEDFORWARD CONTROL.But, drafts large in cold continuous rolling process is all completed by upstream milling train, and strip property fluctuation has repeating transmission to the impact with the thick difference of steel, this cold strip tandem method processed only depends on two frames in downstream to carry out resistance of deformation FEEDFORWARD CONTROL, can not eliminate the finished product that origin material strip property deviation causes thick poor.

Summary of the invention

The object of this patent is, into improving cold-rolled steel strip products thickness of slab quality, to provide a kind of strip steel thickness feedforward control method detecting based on strip property.

In order to achieve the above object, design of the present invention is as follows:

One, instrument arrangement

Because incoming band steel performance is for having larger impact with the thick control accuracy of steel plate, and field data show incoming band steel performance inconsistency is very large, therefore in this patent system configuration, entrance side at milling train is installed calibrator and performance detector, calibrator is for the one-tenth-value thickness 1/10 of on-line measurement incoming band steel, and performance detector is for the performance number of on-line measurement incoming band steel;

Two, the calculating of incoming band steel resistance of deformation value, first calculates the front incoming band steel resistance of deformation of the first milling train, is designated as , its calculating formula is as follows:

(1)

Wherein, be the front incoming band steel yield strength value of the first milling train 1, for strip plastic deformation resistance coefficient;

Then, calculate the second milling train 2 to the resistance of deformation value of the 5th milling train 5 front incoming band steel, its calculating formula is as follows:

(2)

Wherein, be incoming band steel resistance of deformation value before frame, for incoming band steel one-tenth-value thickness 1/10, be belt steel thickness value after frame rolling, for different frame band hardening of steel coefficients,

Before presetting each frame, strip plastic deformation drag value is , the strip plastic deformation drag undulating value of different frames, is designated as , by following formula, calculated:

(3)

Three, the belt steel thickness FEEDFORWARD CONTROL algorithm detecting based on strip property

1., the first milling train 1 to the front incoming band steel cold-rolled process of the 5th milling train 5, calculate belt steel thickness value and belt steel rolling pressure, its calculating formula is respectively:

(4)

(5)

Wherein, be the first milling train 1 to the belt steel thickness value after the 5th milling train 5 rollings, be the first milling train 1 to the 5th milling train 5 roll gap signals, be the first milling train 1 to the 5th milling train 5 draught pressure values, be the first milling train 1 to the pre-throw-on pressure value of the 5th milling train 5 roll, be that the first milling train 1 to the 5th milling train 5 bending roller force values cause roll gap to change, for milling train toe-out stress value, for milling train posttension stress value,

be the first milling train 1 to belt steel thickness value before the 5th milling train 5 rollings, for strip plastic deformation drag value, for the coefficient of friction with steel and roll shop building;

2., calculate belt steel thickness increment and belt steel rolling pressure increment, its calculating formula is respectively:

(6)

(7)

Wherein, for belt steel thickness increment, for belt steel rolling pressure increment,

By belt steel rolling pressure increment calculating formula (7) substitution belt steel thickness incremental computations formula (6), arrangement obtains:

(8)

If be with steel thick poor after rolling thick poor,

(9)

, establish , , belt steel thickness FEEDFORWARD CONTROL algorithm is as follows

(10)

According to foregoing invention design, the present invention adopts following technical proposals:

The strip steel thickness feedforward control method detecting based on strip property, is characterized in that concrete operations are as follows:

(1), determine the model of performance detector and calibrator: by the specification of milling train model and incoming band steel, determine the concrete model of performance detector and calibrator;

(2), installation capability detector and calibrator: performance detector and calibrator are arranged on to inlet of rolling mill side, apart from milling train distance, are respectively with position;

(3), obtain current coil of strip THICKNESS CONTROL coefficient: start rolling, obtain reel number, specification and rolling procedure and the belt steel thickness control coefrficient of current volume;

(4), obtain belt steel thickness FEEDFORWARD CONTROL information: in each THICKNESS CONTROL, in the cycle, gather strip property value and one-tenth-value thickness 1/10, according to strip property value and one-tenth-value thickness 1/10, calculate resistance of deformation value, obtain resistance of deformation undulating value and thickness fluctuation value;

(5), storage belt steel thickness FEEDFORWARD CONTROL information: deposit the resistance of deformation undulating value of above-mentioned every section strip steel and thickness fluctuation value in memory;

(6), calculate belt steel thickness FEEDFORWARD CONTROL amount: when corresponding section strip steel is rolled, from memory, read corresponding resistance of deformation undulating value and thickness fluctuation value, according to above-mentioned belt steel thickness FEEDFORWARD CONTROL algorithm, calculate roll control amount;

(7), real-time thickness FEEDFORWARD CONTROL: give THICKNESS CONTROL executing agency by roll control amount, complete real-time thickness FEEDFORWARD CONTROL.The present invention compared with prior art, has following apparent substantive distinguishing features and remarkable advantage:

The present invention is based on the strip steel thickness feedforward control method that strip property detects, for existing strip steel thickness feedforward control method, only consider incoming band steel thickness fluctuation and the deficiency that do not have strip property to detect, provide the configuration installation method of a kind of performance detector and calibrator, adopt incoming band steel thickness fluctuation value and resistance of deformation undulating value to carry out belt steel thickness FEEDFORWARD CONTROL, for the uniformity of guaranteeing finished strip thickness of slab on whole coil of strip length direction, improve belt steel thickness rolling accuracy and there is good actual application value.

accompanying drawing explanation

Fig. 1 is instrumentation of the present invention and milling train fitting arrangement.

Fig. 2 is the strip steel thickness feedforward control method flowsheet detecting based on strip property.

The specific embodiment

Below by accompanying drawing and preferred embodiment, technical scheme of the present invention is described in further detail.

The present embodiment is that the UCM milling train for five frame six rollers carries out the strip steel thickness feedforward control method detecting based on strip property.

Below in conjunction with accompanying drawing, embodiment is elaborated.

One, instrument arrangement and installation

In the first milling train 1 porch, configure respectively performance detector 6 and calibrator 7, the distance that performance detector 6 and calibrator 7 are arranged at a distance of the first milling train 1 entrance is with , being respectively used to one-tenth-value thickness 1/10 and the incoming band steel resistance of deformation value of on-line measurement incoming band steel, mounting arrangements is as shown in Figure 1;

Two, the calculating of incoming band steel resistance of deformation value

First, calculate the front incoming band steel resistance of deformation of the first milling train, be designated as , its calculating formula is as follows:

(1)

Wherein, be the front incoming band steel yield strength value of the first milling train 1, for strip plastic deformation resistance coefficient,

Then, calculate the second milling train 2 to the resistance of deformation value of the 5th milling train 5 front incoming band steel, its calculating formula is as follows:

(2)

Wherein, be incoming band steel resistance of deformation value before frame, for incoming band steel one-tenth-value thickness 1/10, be belt steel thickness value after frame rolling, for different frame band hardening of steel coefficients,

Before presetting each frame, strip plastic deformation drag value is , the strip plastic deformation drag undulating value of different frames, is designated as , by following formula, calculated:

(3)

Three, the belt steel thickness FEEDFORWARD CONTROL algorithm detecting based on strip property

1., the first milling train 1 to the 5th milling train 5 incoming band steel cold-rolled process, calculate belt steel thickness value and belt steel rolling pressure, its calculating formula is respectively:

(4)

(5)

Wherein, be the first milling train 1 to the belt steel thickness value after the 5th milling train 5 rollings, be the first milling train 1 to the 5th milling train 5 roll gap signals, be the first milling train 1 to the 5th milling train 5 draught pressure values, be the first milling train 1 to the pre-throw-on pressure value of the 5th milling train 5 roll, be that the first milling train 1 to the 5th milling train 5 bending roller force values cause roll gap to change, for milling train toe-out stress value, for milling train posttension stress value, be the first milling train 1 to belt steel thickness value before the 5th milling train 5 rollings, for strip plastic deformation drag value, for the coefficient of friction with steel and roll shop building;

2., calculate belt steel thickness increment and belt steel rolling pressure increment, its calculating formula is respectively:

(6)

(7)

Wherein, for belt steel thickness increment, for belt steel rolling pressure increment

By belt steel rolling pressure increment calculating formula (7) substitution belt steel thickness incremental computations formula (6), arrangement obtains:

(8)

If be with steel thick poor after rolling thick poor,

(9)

, establish , , belt steel thickness FEEDFORWARD CONTROL algorithm is as follows

(10)

A kind of following (see figure 2) of strip steel thickness feedforward control method concrete operations detecting based on strip property of the present invention:

(1), determine the model of performance detector 6 and calibrator 7: by the first milling train 1, the second milling train 2, the 3rd milling train 3, the 4th milling train 4 and the 5th model of milling train 5 and the specification of incoming band steel, determine the concrete model of performance detector 6 and calibrator 7;

(2), installation capability detector 6 and calibrator 7: performance detector 6 and calibrator 7 are arranged on to inlet of rolling mill side, apart from milling train distance, are respectively with position, for example, for 3000mm and for 2500mm;

(3), obtain current coil of strip THICKNESS CONTROL coefficient: start rolling, obtain reel number, specification and rolling procedure and the belt steel thickness control coefrficient of current volume;

(4), obtain belt steel thickness FEEDFORWARD CONTROL information: in each THICKNESS CONTROL, in the cycle, gather strip property value and one-tenth-value thickness 1/10, according to strip property value and one-tenth-value thickness 1/10, calculate resistance of deformation value, obtain resistance of deformation undulating value and thickness fluctuation value;

(5), storage belt steel thickness FEEDFORWARD CONTROL information: deposit the resistance of deformation undulating value of above-mentioned every section strip steel and thickness fluctuation value in memory;

(6), calculate belt steel thickness FEEDFORWARD CONTROL amount: when corresponding section strip steel is rolled, from memory, read corresponding resistance of deformation undulating value and thickness fluctuation value, according to above-mentioned belt steel thickness FEEDFORWARD CONTROL algorithm, calculate roll control amount;

(7), real-time thickness FEEDFORWARD CONTROL: give THICKNESS CONTROL executing agency by roll control amount, complete real-time thickness FEEDFORWARD CONTROL.

Claims (1)

1. the strip steel thickness feedforward control method detecting based on strip property, is characterized in that, concrete steps are as follows:

(1), determine the model of performance detector (6) and calibrator (7): by the first milling train (1), the second milling train (2), the 3rd milling train (3), the 4th milling train (4) and the model of the 5th milling train (5) and the specification of incoming band steel, determine the concrete model of performance detector (6) and calibrator (7);

(2), installation capability detector (6) and calibrator (7): performance detector (6) and calibrator (7) are arranged on to inlet of rolling mill side, apart from milling train distance, are respectively with position;

(3), obtain current coil of strip THICKNESS CONTROL coefficient: start rolling, obtain reel number, specification and rolling procedure and the belt steel thickness control coefrficient of current volume;

(4), obtain belt steel thickness FEEDFORWARD CONTROL information: in each THICKNESS CONTROL, in the cycle, gather strip property value and one-tenth-value thickness 1/10, according to strip property value and one-tenth-value thickness 1/10, calculate resistance of deformation value, obtain resistance of deformation undulating value and thickness fluctuation value;

(5), storage belt steel thickness FEEDFORWARD CONTROL information: deposit the resistance of deformation undulating value of above-mentioned every section strip steel and thickness fluctuation value in memory;

(6), calculate belt steel thickness FEEDFORWARD CONTROL amount: when corresponding section strip steel is rolled, from memory, read corresponding resistance of deformation undulating value and thickness fluctuation value, according to above-mentioned belt steel thickness FEEDFORWARD CONTROL algorithm, calculate roll control amount;

(7), real-time thickness FEEDFORWARD CONTROL: give THICKNESS CONTROL executing agency by roll control amount, complete real-time thickness FEEDFORWARD CONTROL.