CN104324948A - Method for controlling width of rolled piece in rough rolling process of hot continuous rolling - Google Patents

Abstract

The invention provides a method for controlling the width of a rolled piece in the rough rolling process of hot continuous rolling, which includes: obtaining PDI data of hot continuous rolling; determining the total number of rolling passes according to the technical requirements of the rolling plan; The exit thickness, exit width and strip threading speed of the pass; the rough rolling process starts, and the rolling schedule is calculated once and sent to the rolling line equipment; the even-numbered first-pass width is calculated; the odd-numbered second pass is calculated According to the rolling width of each odd-numbered pass and the rolled thickness of each even-numbered pass, the vertical roll opening and the flat roll gap are continuously adjusted to complete hot continuous rolling. The width of the piece is controlled until the end of the hot rolling rough rolling process. The invention can calculate the width after even-numbered passes on-line, can be successfully applied in the width control process of hot continuous rolling and rough rolling, replaces the role of the width measuring instrument, and improves the precision of width control while saving production investment costs .

Description

A kind of rougher of hot strip mill process rolled piece width control method

Technical field

The invention belongs to operation of rolling control technology field, be specifically related to a kind of rougher of hot strip mill process rolled piece width control method.

Background technology

In hot continuous rolling production process, the width control system of roughing mills primary responsibility rolled piece, rolls rear width by each passage of width calculated with mathematical model, ensures that finished width is within the scope required.

Current domestic and international most of hot continuous rolling production line, the configuration mode of two frames that roughing mills extensively adopts " edger roll+plain-barreled roll ", adopts total road number of times to be the reciprocal rolling strategy of odd-numbered pass.For reducing costs, width gage is configured with after the general only machine of roughing mills, the rolled piece developed width of (after the Comprehensive Control of edger roll and plain-barreled roll) after being merely able to measure odd-numbered pass rolling, cannot measure the width after even-numbered pass rolling, have influence on the computational accuracy of width model.

Can only predict the width after even-numbered pass rolling at present, there is certain deviation in result, is unfavorable for the accurate control of width.The present invention mainly utilizes on-the-spot measuring instrument, and by suitable edger roll opening degree change curve, the width after utilizing the mode of mathematics to calculate even-numbered pass rolling, can improve the precision of length prediction.

Summary of the invention

For prior art Problems existing, the invention provides a kind of rougher of hot strip mill process rolled piece width control method.

Technical scheme of the present invention is:

A kind of rougher of hot strip mill process rolled piece width control method, comprises the following steps:

Step 1: obtain hot continuous rolling PDI data, comprise the data of original blank, the thickness of intermediate blank and width, and the thickness of finished product and width;

Step 2: according to rolling scaduled technological requirement, determines total road number of times of rolling;

Step 3: determine the exit thickness of each passage, exit width and threading speed according to the thickness of intermediate blank and width;

Step 3.1: determine each passage exit thickness;

Step 3.2: determine each passage exit width;

Step 3.3: according to workpiece thickness and each passage setting thickness, obtain the linear velocity of each passage;

Step 4: rolling process of rough rolling starts, carries out a rolling schedule calculation and is issued to rolling line equipment; Rolling procedure comprises: edger roll opening degree peace roller gap;

Step 4.1: rolled piece enters edger roll and plain-barreled roll successively, the rougher of hot strip mill operation of rolling starts;

Step 4.2: the width gage exported by roughing is measured odd number first passage and rolled rear width;

Step 4.3: odd number first passage according to measuring rolls rear width, revises the plain-barreled roll roll gap of even number first passage, and is issued to rolling line equipment and carries out even number first passes;

Step 5: calculate even number first passage and roll rear width;

Step 5.1: calculate odd number first passage outgoing gauge and current even number first passage outgoing gauge;

Step 5.2: in the even number first passage operation of rolling, edger roll opening degree reduces gradually according to one step;

Step 5.3: when there is roll-force signal, makes edge rolling try hard to keep by adjustment edger roll opening degree and holds within limits;

Step 5.4: roll-force after a period of stabilisation, gets edger roll opening degree mean value in this time period, namely current even number first passage roll rear width;

Step 6: calculate the edger roll opening degree of odd number second passage and be issued to rolling line equipment;

Step 6.1: that rolls rear width and even number first passage according to odd number first passage rolls rear width, calculates the unrestricted spread amount in the even number first passage operation of rolling and unrestricted spread coefficient;

Step 6.2: roll rear width according to odd number first passage, calculates dog bone absolute spread and dog bone spread coefficient;

Step 6.3: the edger roll opening degree peace roller gap calculating odd number second passage according to unrestricted spread coefficient and dog bone spread coefficient;

Step 7: repeat step 4 ~ step 6, the outgoing gauge of rear width and each passage of even number is rolled according to each passage of odd number, continuous opposite roller opening degree peace roller gap adjusts, complete rougher of hot strip mill rolled piece width control system, until the rougher of hot strip mill operation of rolling terminates, obtain the intermediate blank meeting width requirement in PDI data.

Beneficial effect:

What the present invention accurately can measure rolling process of rough rolling even-numbered pass rolls rear width, solves in the problem without width after cannot measuring the rolling of even-numbered pass when width gage.The present invention safely can be high, calculates accurately, can calculate even-numbered pass online and roll rear width, can be successfully applied in rougher of hot strip mill width control system process, instead of the effect of width gage, while having saved investment of production cost, improve the precision of width control system.

Accompanying drawing explanation

Fig. 1 is typical heat tandem rolling roughing mills " edger roll+plain-barreled roll " the instrument arrangement schematic diagram of the specific embodiment of the invention;

Fig. 2 is that the first passage of the specific embodiment of the invention rolls rear change width schematic diagram, a () is the section configuration of raw material slab, b () is the section configuration after edge rolling, (c) is the section configuration after flat rolling;

Fig. 3 is the roll-force change curve with the change of edger roll opening degree of the specific embodiment of the invention;

Fig. 4 is the rougher of hot strip mill process rolled piece width control method flow chart of the specific embodiment of the invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.

Present embodiment adopts typical heat tandem rolling roughing mills, adopt " edger roll+plain-barreled roll " arrangement form as shown in Figure 1, measuring instrument comprises: the hot metal detector 1. before machine, in machine, after machine 2. before machine, temperature measurer 3. width gage 4. edger roll displacement transducer, pressure sensor, speed encoder 5. plain-barreled roll displacement transducer, pressure sensor, speed encoder after machine after machine.

The effect of each measuring instrument is respectively: hot metal detector is for following the tracks of the particular location of rolled piece in the operation of rolling; Temperature measurer is for measuring the temperature of rolled piece; Width gage is for measuring the rolled piece width after odd-numbered pass rolling; Displacement transducer is for measuring the position of edger roll (plain-barreled roll); Pressure sensor is for measuring the roll-force in the operation of rolling; Speed encoder is for measuring edger roll (plain-barreled roll) rotating speed in the operation of rolling.

Rolling direction (is defined as odd-numbered pass) from left to right, turn left from the right side (being defined as even-numbered pass).As shown in Figure 2, in Rolling Production process, intermediate blank (profile in Fig. 2 (a)) through odd-numbered pass first through edge rolling (profile in Fig. 2 (b)), after through flat rolling (profile in Fig. 2 (c)); Even-numbered pass, first through flat rolling, edger roll does not participate in controlling (opening completely), and reciprocal rolling, finally completes the operation of rolling.

Rolling direction (is defined as odd-numbered pass) from left to right, turn left from the right side (being defined as even-numbered pass).In process of production, odd-numbered pass first through edge rolling, after through flat rolling; Even-numbered pass, first through flat rolling, edger roll does not participate in controlling (opening completely), and reciprocal rolling, finally completes the operation of rolling.

A kind of rougher of hot strip mill process rolled piece width control method, as shown in Figure 4, comprises the following steps:

Step 1: obtain hot continuous rolling PDI (Primary Date Input) data, comprise the data of original blank, the thickness of intermediate blank and width, and the thickness of finished product and width;

The new rolled piece of hot continuous rolling starts to produce, first through rough rolling step, rough rolling process control system receives the PDI creation data that host computer (production control level) transmission is come, mainly comprise the data of original blank, as coil of strip number, steel grade, heating heat (batch) number, charge length, width, thickness, the thickness of intermediate blank, width, temperature, and the thickness of finished product, width etc.Blank carries out by roughing mills the operation of rolling that total passage is odd-numbered pass.

Step 2: according to rolling scaduled technological requirement, determines total road number of times of rolling;

Step 3: the threading speed determining the exit thickness of each passage, exit width and roughing according to the thickness of intermediate blank and width;

Step 3.1: determine each passage exit thickness;

According to the allocation model of reduction ratio, determine each passage exit thickness, computing formula is as follows:

H _i=H _i(1-r _i), wherein, h _ibe the i-th passage exit thickness, H _ibe the i-th passage inlet thickness, r _iit is the reduction in thickness of i-th passage;

Step 3.2: determine each passage exit width;

According to the allocation model of reduction ratio, determine each passage exit width, computing formula is as follows:

W _i=W _i(1-r _wi), wherein, w _ibe the i-th passage exit width, W _ibe the i-th passage throat width, r _wiit is the width reduction ratio of i-th passage;

Step 3.3: according to workpiece thickness and each passage setting thickness, table look-up and obtain the threading speed of each passage;

Step 4: rolling process of rough rolling starts, carries out a rolling schedule calculation and is issued to rolling line equipment; Rolling procedure comprises: edger roll opening degree peace roller gap;

Step 4.1: rolled piece enters edger roll and plain-barreled roll successively, the rougher of hot strip mill operation of rolling starts;

Fig. 2 (a) is the section configuration of raw material slab, and wherein, L1 is slab thickness h ₀; L2 is width of plate slab w ₀; Fig. 2 (b) is the section configuration after edge rolling, and wherein, L3 is rolled piece and roll contact height h _r; L4 is dog bone maximum height h _d; L5 is that edger roll rolls rear width w _e; L6 is dog bone peak position L _p; L7 is dog bone zone of influence length L _d; L8 is that dog bone spreads fig. 2 (c) is the section configuration after flat rolling, and wherein, L9 is thickness h after odd-numbered pass rolling ₁; L10 is natural width spread l11 is that odd-numbered pass rolls rear width w ₁.

Step 4.2: the width gage exported by roughing is measured odd number first passage and rolled rear width;

Odd number i-th passage rolls rear width:

w _i＝w _E,i+Δw _D,i+Δw _N,i(1)

In formula: i is passage number; w _e,ifor the width before odd number i-th passage flat rolling; Δ w _d,ifor dog bone spreads; Δ w _n,ifor unrestricted spread;

Dog bone absolute spread Δ w _d,icalculated by formula (2):

Δw _D,i＝s _E(w _i-w _E,i) (2)

In formula: s _efor dog bone spread coefficient;

Unrestricted spread amount Δ w _n,icalculated by formula (3):

${\mathrm{\Δw}}_{N,i}=[{\left(\frac{h_{i-1}}{h_i}\right)}^{S_B}-1](w_{E,i}+{\mathrm{\Δw}}_{D,i})---\left(3\right)$

In formula: S _bfor unrestricted spread coefficient; h _i-1for the inlet thickness of odd number i-th passage; h _ifor the exit thickness of odd number i-th passage;

Step 4.3: roll rear width w according to odd number first passage that the width gage of roughing outlet measures _i, revise the plain-barreled roll roll gap of even number first passage, and be issued to rolling line equipment and carry out even number first passes;

Step 5: calculate even number first passage and roll rear width;

In the even-numbered pass operation of rolling, edger roll does not participate in width control system, and plain-barreled roll participates in press control, and the rear width calculation formula that rolls of even-numbered pass is:

w _i＝w _i-1+Δw _N,i(4)

In formula: w _i-1for a upper odd-numbered pass rolls rear width value, Δ w _n,ifor unrestricted spread amount.

Step 5.1: calculate odd number first passage outgoing gauge and current even number first passage outgoing gauge;

After odd number first passes, rolling rear width is w ₁; Outgoing gauge value is h ₁, h ₁calculated by spring equation:

$h_1=S_1+\frac{F_1}{K_m}---\left(\text{5}\right)$

In formula: S ₁for the Roll-gap position of horsemanship first passage flat rolling, detected by plain-barreled roll displacement transducer and obtain; F ₁for odd number first passage flat rolling power measured value, detected by plain-barreled roll pressure sensor and obtain; K _mfor mill stiffness;

Outgoing gauge h after even number first passes completes ₂can be calculated by spring equation:

$h_2=S_2+\frac{F_2}{K_m}---\left(\text{6}\right)$

In formula: S ₂for the Roll-gap position of even number first passage flat rolling; F ₂for even number first passage flat rolling power measured value;

Step 5.2: in the even number first passage operation of rolling, edger roll opening degree reduces gradually according to one step;

In the even number first passage operation of rolling, when (the outlet of even-numbered pass of roughing entrance hot metal detector, instrument in Fig. 1 is 1.) when detecting that rolled piece arrives this position, the tracking signal of the correspondence that can generate, now the opening degree of edger roll according to one step 0.02mm/ms by diminishing gradually greatly, rolled piece in the operation of rolling is close, until registration appears in edger roll pressure sensor.Now, opening degree change curve and the corresponding roll-force change curve of edger roll are as shown in Figure 3:

Step 5.3: when there is roll-force signal, makes edge rolling try hard to keep by adjustment edger roll opening degree and holds within limits;

Step 5.4: roll-force after a period of stabilisation, gets edger roll opening degree mean value in this time period, namely current even number first passage roll rear width;

When edger roll contacts with rolled piece time (the A point namely in Fig. 3), edger roll pressure sensor can receive measuring-signal F _e, be the interference eliminating roll-force noise signal, now according to another step-length edger roll opening degree slowly shunk or open, ensureing that the scope of roll-force is at 0 ~ δ F _e(δ F _e=60kN) the interior fluctuation (can ignore the impact that rolled piece width causes within the scope of this roll-force) of scope, after stablizing a period of time, the mean value of edger roll opening degree within this period of sampling time (shown in the B in Fig. 3), this mean value is the developed width w of this passage rolled piece ₂, namely current even number first passage roll rear width.

Step 6: calculate the edger roll opening degree of odd number second passage and be issued to rolling line equipment;

Step 6.1: that rolls rear width and even number first passage according to odd number first passage rolls rear width, calculates the unrestricted spread amount in the even number first passage operation of rolling and unrestricted spread coefficient;

Use the width w before even number first passes ₁developed width w after (i.e. odd number first passage roll rear width) and even number first passes ₂(calculate ), calculate the unrestricted spread amount Δ w in the even number first passage operation of rolling _{n, 2}, obtained by formula (3): Δ w _{n, 2}=w ₂-w ₁;

Because even-numbered pass only has natural width spread, therefore Δ w _{d, 2}=0, the thickness h before and after rolling can be calculated respectively according to formula (5) and formula (6) ₁and h ₂, obtain unrestricted spread coefficient by formula (3):

$S_B={\log }_{\frac{h_1}{h_2}}(\frac{{\mathrm{\Δw}}_{N,2}}{w_{E,2}+{\mathrm{\Δw}}_{D,2}}+1)---\left(\text{7}\right)$

Step 6.2: roll rear width w according to odd number first passage ₁, calculate dog bone absolute spread and dog bone spread coefficient;

By the unrestricted spread coefficient S calculated _b, according to formula (1) and formula (3), obtain the equation group shown in formula (8), solve the unrestricted spread amount Δ w that can obtain odd number first passes _{n, 1}:

$\left\{\begin{array}{c}{w}_1=w_{E,1}+{\mathrm{\Δw}}_{D,1}+{\mathrm{\Δw}}_{N,1}\\ \mathrm{\Δ}{w}_{N,1}=[{\left(\frac{h_0}{h_1}\right)}^{S_B}-1](w_{E,1}+{\mathrm{\Δw}}_{D,1})\end{array}\right.---\left(8\right)$

Solve an equation, obtain

${\mathrm{\Δw}}_{D,1}=w_1{\left(\frac{h_1}{h_0}\right)}^{S_B}-w_{E,1}---\left(9\right)$

Bring formula (9) into formula (2), dog bone spread coefficient S can be calculated _e:

$S_E=\frac{w_1{\left(\frac{h_1}{h_0}\right)}^{S_B}-w_{E,1}}{w_1-w_{E,1}}---\left(10\right)$

Step 6.3: the edger roll opening degree calculating odd number second passage according to unrestricted spread coefficient and dog bone spread coefficient;

According to the developed width w of even number first passage obtained ₂, according to formula (1), (2), (3) and formula (7) (10) adjustment, the continuation again of the opening degree of the edger roll of odd number first passage is set, obtains the w satisfied condition _e,i, obtain the odd number second passage exit width that setting requires.

$w_{E,i}=w_i^{*}-({\mathrm{\Δw}}_{D,i}+{\mathrm{\Δw}}_{N,i})---\left(11\right)$

In formula: for the target call width of odd number second passage.

Step 7: repeat step 4 ~ step 6, the outgoing gauge of rear width and each passage of even number is rolled according to each passage of odd number, continuous opposite roller opening degree adjusts, complete rougher of hot strip mill process rolled piece width control system, until the rougher of hot strip mill operation of rolling terminates, obtain the intermediate blank meeting width requirement in PDI data.

After each passage has calculated, calculated value is issued to HMI (Human Machine Interface) and basic automatization Level1 and performs, carry out the corresponding operation of rolling.Typical rolling procedure is as shown in table 1.

The typical rolling schedule calculation result of table 1

Claims (1)

1. a rougher of hot strip mill process rolled piece width control method, is characterized in that: comprise the following steps:

Step 1: obtain hot continuous rolling PDI data, comprise the data of original blank, the thickness of intermediate blank and width, and the thickness of finished product and width;

Step 2: according to rolling scaduled technological requirement, determines total road number of times of rolling;

Step 3: determine the exit thickness of each passage, exit width and threading speed according to the thickness of intermediate blank and width;

Step 3.1: determine each passage exit thickness;

Step 3.2: determine each passage exit width;

Step 3.3: according to workpiece thickness and each passage setting thickness, obtain the linear velocity of each passage;

Step 4: rolling process of rough rolling starts, carries out a rolling schedule calculation and is issued to rolling line equipment; Rolling procedure comprises: edger roll opening degree peace roller gap;

Step 4.1: rolled piece enters edger roll and plain-barreled roll successively, the rougher of hot strip mill operation of rolling starts;

Step 4.2: the width gage exported by roughing is measured odd number first passage and rolled rear width;

Step 4.3: odd number first passage according to measuring rolls rear width, revises the plain-barreled roll roll gap of even number first passage, and is issued to rolling line equipment and carries out even number first passes;

Step 5: calculate even number first passage and roll rear width;

Step 5.1: calculate odd number first passage outgoing gauge and current even number first passage outgoing gauge;

Step 5.2: in the even number first passage operation of rolling, edger roll opening degree reduces gradually according to one step;

Step 5.3: when there is roll-force signal, makes edge rolling try hard to keep by adjustment edger roll opening degree and holds within limits;

Step 5.4: roll-force after a period of stabilisation, gets edger roll opening degree mean value in this time period, namely current even number first passage roll rear width;

Step 6: calculate the edger roll opening degree of odd number second passage and be issued to rolling line equipment;

Step 6.1: that rolls rear width and even number first passage according to odd number first passage rolls rear width, calculates the unrestricted spread amount in the even number first passage operation of rolling and unrestricted spread coefficient;

Step 6.2: roll rear width according to odd number first passage, calculates dog bone absolute spread and dog bone spread coefficient;

Step 6.3: the edger roll opening degree peace roller gap calculating odd number second passage according to unrestricted spread coefficient and dog bone spread coefficient;

Step 7: repeat step 4 ~ step 6, the outgoing gauge of rear width and each passage of even number is rolled according to each passage of odd number, continuous opposite roller opening degree peace roller gap adjusts, complete rougher of hot strip mill rolled piece width control system, until the rougher of hot strip mill operation of rolling terminates, obtain the intermediate blank meeting width requirement in PDI data.