CN103934279A - Method for dynamic short-stroke control over width of slab from head to tail - Google Patents

Abstract

The invention discloses a method for dynamic short-stroke control over the width of a slab from head to tail. The method comprises the steps that N control points are obtained from a head short-stroke control zone of the slab and are evenly arranged; a final short-stroke control compensation amount A'i of each control point is determined according to a model, so that the size of a gap between vertical rolls is adjusted in the vertical roll lateral pressing process according to the final short-stroke control compensation amounts A'i. By the adoption of the method for dynamic short-stroke control over the width of the slab from head to tail, the appropriate shapes of the head and the tail of the slab can be found, so that the head cutting amount and the tail cutting amount are reduced, and therefore the hot rolling yield is improved.

Description

The dynamic short stroke control method of slab head and tail width

Technical field

The present invention relates to a kind of strip width control method, relate in particular to a kind of edger roll short stroke control method.

Background technology

As shown in Figure 1, in vertical roller side pressing plate base head process, because of firm end effect, can there is obviously to lose wide phenomenon in slab head.

Edger roll short stroke is controlled (SSC) and is lost end to end wide, to improve strip lumber recovery a kind of strip width control technology for overcoming slab.It is the contour curve that slab head-tail shrinks during according to edger roll side pressure, and the roll gap of vertical miller is constantly changed in the operation of rolling, and the curve of its variation is symmetrical but contrary with the contour curve of contraction, thereby the mistake causing while compensating side pressure is wide.That is to say, the contour shape end to end of strip width curve when not taking edger roll short stroke to control, oppositely sets edger roll in slab roll gap size during side pressure end to end, the wide amount of mistake during the side pressure of compensation head, pass through again the rolling of horizontal passage, obtain in theory straight slab nose shape.

Edger roll short stroke is controlled at present generally 2 kinds of patterns: a kind of is in conjunction with produced on-site experience, for other supplied materials of certain one deck, fixing short stroke compensation rate is set; Another kind is the short stroke control mode adopting with learning ability, according to the slab nose shape of the measured roughing final pass of measuring instrument, calculate the wide amount of actual mistake of slab head, then head, the tail that Shape Prediction model calculates end to end lost wide amount and revised, by the wide amount of revised slab mistake end to end, determine the control curve of short stroke and relevant setting value.Relative fixed compensation, short stroke compensation with learning ability, can be according to the actual slab Head and Tail Shape obtaining, revise short stroke compensation rate, seem more reasonable, but because the Head and Tail Shape of supplied materials itself is just different, be that input parameter is unfixing, often cause study fluctuation, even to wrong direction, learn, add technical sophistication, as before edger roll side pressure, after slab Head and Tail Shape scanning, be subject to the impact of on-the-spot adverse circumstances often to occur detecting unsuccessfully, cause mode input and output parameter inaccurate, from scene, the actual effect that comes into operation is seen on the contrary be not as stable as first kind of way, so actual being difficult to of short stroke control method with genetic learning plays a role.

While adopting above-mentioned two kinds of short stroke control modes, even if the short stroke compensation rate of setting is quite reasonable, obtained for the moment perfect head and tail width shape, consider the actual conditions of variation, as changed when the actual edger roll lateral pressure amount of slab, cause and lose end to end wide amount and change, Head and Tail Shape also can change thereupon, and this will ask compensation rate also will change thereupon.

Publication number is JP8206714A, open day is on August 13rd, 1996, the Japanese documentation that name is called " METHODFOR CONTROLLING SHEET WIDTHIN HOT ROLLING MILL AND ARITHMETIC UNITFOR EDGER OPENING " introduced a kind of control lose end to end wide, reduce the method for cutting damage, it detects head and tail width according to width gauge before entrance, switching by edger roll after conversion and control is measured, and reduces and loses end to end wide amount.

Publication number is JP61232011A, open day is on October 16th, 1986, name is called the Japanese documentation of " METHODAND APPARATUS FOR CONTROLLING PLATE WIDTH BY EDGER ROLL " and has introduced a kind of method and apparatus that slab head and tail width changes suddenly of controlling, it is also the head and tail width contour curve needing according to detecting, an edger roll roll gap correction is exported in conversion, solves the fluctuation problem of head and tail width.

Summary of the invention

The dynamic short stroke control method that the object of this invention is to provide a kind of slab head and tail width, in conjunction with produced on-site experience, for other supplied materials of certain one deck, arrange on the basis of fixing short stroke compensation rate, by this control method, even if actual slab vertical roller side pressure amount is changed with setting lateral pressure amount, also can obtain relatively reasonable short stroke compensation rate, thereby obtain suitable slab Head and Tail Shape at every turn, and then reduce crop, back-end crop amount, thereby improve hot rolling lumber recovery.

In order to realize above-mentioned purpose of the present invention, the invention provides a kind of dynamic short stroke control method of slab head and tail width, it is in conjunction with former produced on-site experience, for other supplied materials of certain one deck, arrange on N control point of fixing short stroke compensation rate, consider the otherness of the actual lateral pressure amount of slab edger roll and setting lateral pressure amount, the dynamic short stroke control method of this slab head and tail width determines that according to following model the short stroke at each control point controls final compensation rate A ' _i, to control final compensation rate A ' according to this short stroke _i, the roll gap of adjusting edger roll in edger roll side pressure process is big or small:

$B=\mathrm{\α}\left(\frac{\mathrm{\ΔW}-K}{2}\right)---\left(1\right)$

$C_i=\frac{(N+1-i)\·B}{N}$ i＝1,2,…,N（2）

A _i＝A _i+C _i?i＝1,2,…,N（3）

Wherein:

α: correction factor, span 0 ~ 3;

Δ W: every time actual lateral pressure amount of edger roll, unit is mm;

K: every time preallocated benchmark lateral pressure amount of edger roll, unit is mm, this value is preset, and according to different production lines, is generally 0 ~ 100mm;

B: absolute compensation rate, unit is mm;

C _i: dynamic compensation amount, unit is mm;

A ' _i: edger roll short stroke is controlled final compensation rate, and unit is mm;

A _i: edger roll short stroke is controlled original offset, and unit is mm, and it is known quantity.

The scope of N in the technical program is generally 1 ~ 20.

In the technical program, by every time actual lateral pressure amount Δ W of edger roll and drafts generally (by producing the historical rolling actual achievement of line, the target lateral pressure amount obtaining, 20mm for example) compare, obtain a departure, consider that this lateral pressure amount is edger roll both sides lateral pressure amount sums, therefore divided by 2; Then be multiplied by correction factor α, obtain absolute compensation rate B; Consider that head diverse location loses the wide order of severity different, edger roll loses during the closer to head wide more serious, apart from head, far lose wide slighter, therefore the absolute compensation rate B that formula 1 is obtained, be assigned to by a certain percentage the diverse location of different head, obtain the dynamic compensation amount C of diverse location _i; Because dynamic compensation amount C _ito obtain according to the deviation of actual edger roll lateral pressure amount and target lateral pressure amount, so when actual short stroke is controlled, the short stroke compensation rate A in the time of must considering target lateral pressure amount _i, edger roll short stroke is controlled original offset, so by dynamic compensation amount C _icontrol original offset A with edger roll short stroke _ibe added, just obtain the final compensation rate A ' that edger roll short stroke is controlled _i.

From technique scheme, can find out, the core of the technical program is, on the basis of existing short stroke compensation rate (being that edger roll short stroke is controlled original offset), further revise, thereby avoid, weaken lateral pressure amount, change the rational impact of short stroke compensation rate end to end.

Compared with prior art, short stroke compensation rate in the dynamic short stroke control method of slab head and tail width of the present invention is more reasonable, adopt the dynamic short stroke control method of this slab head and tail width can access suitable slab Head and Tail Shape, and then reduce crop, back-end crop amount, improve hot rolling lumber recovery.

Accompanying drawing explanation

Fig. 1 has shown that slab head " loses " phenomenon wide.

Fig. 2 is the technical program correlation curve figure of original compensation rate and final compensation rate in one embodiment.

The specific embodiment

Now according to a particular embodiment of the invention, the application process of the technical program is further described.

Original short stroke control method is that minute 10 points are with steel head short stroke to control, and every some compensation rate is fixed value.Table 1 the 1st row " location point " represents short stroke compensated position, 10 be respectively=100mm of location point, 200mm, 300mm ... 1000mm(be take slab head as benchmark, 100mm represents that apart from head position be 100mm, every some position capable of regulating), 10 location point short strokes are fixed compensation amount, are respectively A ₁=3, A ₂=4, A ₃=3.5 ... A ₁₀every some offset capable of regulating of=0() (in Table 1 the 2nd row).

On the basis that the present embodiment is controlled in original short stroke, revise, in slab head short stroke control area, get 10 control points, these 10 points remain 10 points shown in table 1 the 1st row, then according to following model, determine that the short stroke at each control point controls final compensation rate A ' _i, to control final compensation rate A ' according to this short stroke _i, the roll gap of adjusting edger roll in edger roll side pressure process is big or small:

$B=\mathrm{\α}\left(\frac{\mathrm{\ΔW}-K}{2}\right)---\left(1\right)$

$C_i=\frac{(N+1-i)\·B}{N}$ i＝1,2,…,N（2）

A′ _i＝A _i+C _i?i＝1,2,…,N（3）

Wherein:

α: correction factor, span 0 ~ 3(table 1 has shown the value of α in the present embodiment);

Δ W: every time actual lateral pressure amount of edger roll, is measured as 10.80767mm in the present embodiment;

K: every time preallocated benchmark lateral pressure amount of edger roll is 20mm in the present embodiment;

B: absolute compensation rate, unit is mm;

C _i: dynamic compensation amount, table 1 has shown the result of calculation in the present embodiment;

A ' _i: edger roll short stroke is controlled final compensation rate, and unit is mm;

A _i: edger roll short stroke is controlled original offset.

Table 1.

The edger roll short stroke that can obtain in the technical program by said method is controlled final compensation rate curve, and Fig. 2 contrasts short stroke compensation rate curve (being final compensation rate) and the original original compensation rate curve that has shown that the technical program adopts.Adopt the technical program, can effectively improve slab nose shape, reduce crop, back-end crop amount, reduce the damage amount of cutting.

It should be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.

Claims (2)

1. a dynamic short stroke control method for slab head and tail width, is characterized in that: according to following model, determine that the short stroke at each control point controls final compensation rate A ' _i, to control final compensation rate A ' according to this short stroke _i, the roll gap of adjusting edger roll in edger roll side pressure process is big or small:

$B=\mathrm{\α}\left(\frac{\mathrm{\ΔW}-K}{2}\right)$

$C_i=\frac{(N+1-i)\·B}{N}$ i＝1,2,…,N

A′ _i＝A _i+C _i?i＝1,2,…,N

Wherein:

α: correction factor, span 0 ~ 3;

Δ W: every time actual lateral pressure amount of edger roll, mm;

K: every time preallocated benchmark lateral pressure amount of edger roll, mm;

B: absolute compensation rate, mm;

C _i: dynamic compensation amount, mm;

A ' _i: edger roll short stroke is controlled final compensation rate, mm;

A _i: edger roll short stroke is controlled original offset, mm, and it is known quantity.

2. the dynamic short stroke control method of slab head and tail width as claimed in claim 1, is characterized in that: the number N at control point is 1-20.