CN103934279B - The dynamic short stroke control method of slab head and tail width - Google Patents

Abstract

The invention discloses a kind of dynamic short stroke control method of slab head and tail width: at QuNGe control point, slab head short stroke control region, described N number of control point is arranged in uniform way, determines the final compensation rate A ' of the short stroke control at each control point according to model _i, with according to the final compensation rate A ' of this short stroke control _ithe roll gap size adjusting edger roll is pressed through in journey in vertical roller side.Adopt the dynamic short stroke control method of slab head and tail width of the present invention can arrive suitable slab Head and Tail Shape, and then reduce crop, back-end crop amount, thus improve hot rolling lumber recovery.

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, particularly relate 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, slab head can occur obviously to lose wide phenomenon.

Edger roll short stroke control (SSC) loses wide, to improve strip lumber recovery a kind of strip width control technology end to end for overcoming slab.It is the contour curve shunk according to slab head-tail during edger roll side pressure, and the roll gap of vertical miller is constantly changed in the operation of rolling, and the curve of its change is symmetrical but contrary with the contour curve of contraction, thus the mistake caused when compensating side pressure is wide.That is, according to the contour shape end to end of strip width curve when not taking edger roll short stroke control, oppositely setting edger roll slab end to end side pressure time roll gap size, compensate the wide amount of mistake during head side pressure, again through the rolling of horizontal passage, obtain slab nose shape straight in theory.

Current edger roll short stroke control generally has 2 kinds of patterns: one is in conjunction with produced on-site experience, for other supplied materials of certain one deck, arranges fixing short stroke compensation rate; Another kind is the short stroke control mode adopting band learning ability, the slab nose shape of the roughing final pass measured by measuring instrument, calculate the wide amount of actual mistake of slab head, then the head calculated Shape Prediction model end to end, tail lose wide amount and revise, and determine the controlling curve of short stroke and relevant setting value by the wide amount of revised slab mistake end to end.Relative fixed compensation, short stroke with learning ability compensates, can according to the actual slab Head and Tail Shape obtained, revise short stroke compensation rate, seem more reasonable, but because the Head and Tail Shape of supplied materials is inherently different, namely input parameter is not fixed, often cause study fluctuation, direction even to mistake learns, add technical sophistication, as before edger roll side pressure, after slab Head and Tail Shape scanning, impact by on-the-spot adverse circumstances often occurs detecting unsuccessfully, cause mode input and output parameter inaccurate, on the contrary not as first kind of way is stablized viewed from the actual effect that comes into operation in scene, so actual being difficult to of short stroke control method of band genetic learning plays a role.

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

Publication number is JP8206714A, publication date is on August 13rd, 1996, name is called that the Japanese documentation of " METHODFORCONTROLLINGSHEETWIDTHINHOTROLLINGMILLANDARITHME TICUNITFOREDGEROPENING " describes a kind of control and loses wide, that damage is cut in reduction method end to end, it detects head and tail width according to width gauge before entrance, by the opening and closing amount of edger roll after conversion and control, reduce and lose wide amount end to end.

Publication number is JP61232011A, publication date is on October 16th, 1986, name is called that the Japanese documentation of " METHODANDAPPARATUSFORCONTROLLINGPLATEWIDTHBYEDGERROLL " describes a kind of method and apparatus controlling slab head and tail width and change suddenly, it is also need the head and tail width contour curve according to detecting, conversion output edger roll roll gap correction, solves the fluctuation problem of head and tail width.

Summary of the invention

The object of this invention is to provide a kind of dynamic short stroke control method of slab head and tail width, in conjunction with produced on-site experience, arrange on the basis of fixing short stroke compensation rate for other supplied materials of certain one deck, by this control method, even if make actual slab vertical roller side pressure amount change with setting lateral pressure amount at every turn, also can obtain relatively reasonable short stroke compensation rate, thus obtain suitable slab Head and Tail Shape, and then reduce crop, back-end crop amount, thus 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 number of control point of fixing short stroke compensation rate, consider the actual lateral pressure amount of slab edger roll and the otherness setting lateral pressure amount, the dynamic short stroke control method of this slab head and tail width determines the final compensation rate A ' of the short stroke control at each control point according to following model _i, with according to the final compensation rate A ' of this short stroke control _i, the roll gap size adjusting edger roll is pressed through in journey at vertical roller side:

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

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

A _i＝A _i+C _ii＝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, and this value is default, according to different production lines, is generally 0 ~ 100mm;

B: definitely compensation rate, unit is mm;

C _i: dynamic compensation value, unit is mm;

A ' _i: the final compensation rate of edger roll short stroke control, unit is mm;

A _i: edger roll short stroke control raw compensation value, unit is mm, and it is known quantity.

The scope of the 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 under normal circumstances (by product line history rolling actual achievement, the target lateral pressure amount obtained, such as 20mm) 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 is wide more serious the closer to losing during head, and distance head far loses wide slighter, therefore the absolute compensation rate B that formula 1 is obtained, be assigned to the diverse location of different head by a certain percentage, namely obtain the dynamic compensation value C of diverse location _i; Because dynamic compensation value C _ibe obtain according to the deviation of actual edger roll lateral pressure amount and target lateral pressure amount, so when actual short stroke control, short stroke compensation rate A during target lateral pressure amount must be considered _i, i.e. edger roll short stroke control raw compensation value, so by dynamic compensation value C _iwith edger roll short stroke control raw compensation value A _ibe added, just obtain the final compensation rate A ' of edger roll short stroke control _i.

As can be seen from technique scheme, the core of the technical program is, the basis of existing short stroke compensation rate (i.e. edger roll short stroke control raw compensation value) is further revised, thus avoid, weaken lateral pressure amount change on 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 obtain suitable slab Head and Tail Shape, and then reduce crop, back-end crop amount, improve hot rolling lumber recovery.

Accompanying drawing explanation

Fig. 1 shows " losing wide " phenomenon of slab head.

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

Detailed description of the invention

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 point 10 points carry out strip steel head short stroke control, and often some compensation rate is fixed value.Table 1 the 1st row " location point " represents short stroke compensated position, 10 location points are respectively=100mm, 200mm, 300mm ... 1000mm(with slab head for benchmark, 100mm represents that distance head position is 100mm, often some position adjustable), 10 location point short strokes are fixed compensation amount, are A respectively ₁=3, A ₂=4, A ₃=3.5 ... A ₁₀=0(often puts offset adjustable) (see table 1 the 2nd row).

The present embodiment is revised on the basis of original short stroke control, 10 control points are got in slab head short stroke control region, these 10 points remain 10 points shown in table 1 the 1st row, then determine the final compensation rate A ' of the short stroke control at each control point according to following model _i, with according to the final compensation rate A ' of this short stroke control _i, the roll gap size adjusting edger roll is pressed through in journey at vertical roller side:

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

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

A′ _i＝A _i+C _ii＝1,2,…,N（3）

Wherein:

α: correction factor, span 0 ~ 3(table 1 shows 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: definitely compensation rate, unit is mm;

C _i: dynamic compensation value, table 1 shows the result of calculation in the present embodiment;

A ' _i: the final compensation rate of edger roll short stroke control, unit is mm;

A _i: edger roll short stroke control raw compensation value.

Table 1.

The final compensation rate curve of the edger roll short stroke control that can be obtained in the technical program by said method, Fig. 2 contrast shows the short stroke compensation rate curve (i.e. final compensation rate) of the technical program employing and original raw compensation discharge curve.Adopt the technical program, can effectively improve slab nose shape, reduce crop, back-end crop amount, reduce and cut damage amount.

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

Claims (2)

1. a dynamic short stroke control method for slab head and tail width, is characterized in that: determine the final compensation rate A of the short stroke control at each control point according to following model _i', with according to the final compensation rate A ' of this short stroke control _i, the roll gap size adjusting edger roll is pressed through in journey at vertical roller side:

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

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

A′ _i＝A _i+C _ii＝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, its span is 0-100mm;

B: definitely compensation rate, mm;

C _i: dynamic compensation value, mm;

A ' _i: the final compensation rate of edger roll short stroke control, mm;

A _i: edger roll short stroke control raw compensation value, mm, 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.