CN103752623B - Improve the autocontrol method of camber of intermediate slab in rough rolling - Google Patents

Abstract

The invention provides a kind of autocontrol method improving camber of intermediate slab in rough rolling, belong to field of mechanical automation control.This control method is divided into two parts content: set the roll gap tilt adjustments value of this passage and revise the roll gap tilt adjustments value of upper a time outlet camber.The former according to the setting roll-force of this passage, setting exit thickness, both sides fixed value of roller slit, acyclic homologically trioial roll-force and both sides mill stiffness value, can be calculated by analytic modell analytical model; The latter is by the slab plastic deformation coefficient of this passage and roll-force is surveyed in the both sides of upper a time and slab plastic deformation coefficient calculations obtains.Control method of the present invention for initial conditions with on-the-spot actual technological parameter, improves automatic control model and effectively controls breakdown bar camber, both handled easilies, can be good at again improving breakdown bar camber problem.

Description

Improve the autocontrol method of camber of intermediate slab in rough rolling

Technical field

The invention belongs to hot-rolled intermediate billet plate shape automation control area, particularly a kind of autocontrol method improving camber of intermediate slab in rough rolling.

Background technology

Intermediate blank, in the rougher of hot strip mill unit operation of rolling, owing to being subject to the impact of various factors, can producing the phenomenon that horizontal direction is bending, be called camber, and especially head, tail camber phenomenon are serious.The main cause producing camber phenomenon has: intermediate blank both sides temperature is different; The intermediate blank that constant width machine causes bends; Both sides mill stiffness is different; Memorial archway and bearing block excesssive gap; Flipper guide centering is bad.The camber of intermediate blank is very big to finish rolling Influence of production, band steel can be caused to occur the accident such as whipping, heap steel, have a strong impact on normal production.

For breakdown bar camber problem, in current actual production, roll gap tilt adjustments mainly relies on manual adjustment, and accuracy relies on the experience of operator, and camber and roll gap tilting value do not form certain quantitative relationship; Existing many relevant automation control methods both at home and abroad, but also have many parts that can be perfect.Such as, method described in patent JP11188415A and CN101934292A is carrying out in real time adjustment to both sides roll gap and control camber by this passage of milling train both sides rolling force deviation, but the method does not consider that milling train both sides stiffness difference is on the impact of camber; Method described in patent CN102728625A is the balance realizing both sides roll-force by adjusting both sides roll gap in real time, and considers the difference of both sides mill stiffness, but the thickness deviation problem that before not having consideration, passage is left over; In addition, (patent JP11319925A, JP61092714A, JP60083715A and JP62033009A are by dissimilar checkout gear to also have many patents, detect the size of camber, then calculate roll gap tilt adjustments value control camber by automatically controlling reponse system, this type systematic relies on the precision of checkout equipment, and therefore cost is high, difficult in maintenance.

Summary of the invention

The object of the present invention is to provide a kind of autocontrol method improving camber of intermediate slab in rough rolling, more effectively can realize the control of breakdown bar camber.

For solving the problems of the technologies described above, the invention provides a kind of autocontrol method improving camber of intermediate slab in rough rolling, be applicable to every time roll gap tilt adjustments of R2 roughing mill, the method is that the roll gap tilt adjustments value by setting this passage goes up with revising the roll gap tilt adjustments value that a time exports camber, calculate the roll gap tilt adjustments setting value of each passage when rolling, its computational process is as follows:

For the i-th passage fore side, first by calculating formula (1):

${\mathrm{\ΔS}}_{M,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})---\left(1\right)$

Calculate the roll gap regulation value Δ S of the i-th passage fore side _{m, Op},

In formula, P ₀-acyclic homologically trioial roll-force, MN; M _op-milling train fore side rigidity, kN/mm; P-the i-th passage setting roll-force, MN; H-the i-th passage fore side exit thickness, mm; S _op0-the i-th passage fore side fixed value of roller slit, mm; Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm;

Then by calculating formula (2):

${\mathrm{\ΔS}}_{h,\mathrm{Op}}=\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(2\right)$

Calculate the correction roll gap regulation value Δ S of the i-th passage fore side _{h, Op};

In formula, P '-the i-th-1 passage setting roll-force, MN; P _op'-i-th-1 passage fore side actual measurement roll-force, MN; Q-the i-th passage strip plastic deformation coefficient, MN/mm; Q '-the i-th-1 passage strip plastic deformation coefficient, MN/mm; M _op-milling train fore side rigidity, kN/mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm;

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, calculate the i-th passage fore side total roll gap regulation value Δ S by calculating formula (3) _op:

${\mathrm{\ΔS}}_{\mathrm{Op}}=\mathrm{\Δ}{S}_{M,\mathrm{Op}}+{\mathrm{\ΔS}}_{h,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})+\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(3\right)$

In formula, Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm; H-the i-th passage fore side exit thickness, mm;

According to the i-th passage fore side total roll gap regulation value Δ S _opidentical computational methods, calculate transmission side total roll gap regulation value Δ S by calculating formula (4) _dr:

${\mathrm{\ΔS}}_{\mathrm{Dr}}={\mathrm{\ΔS}}_{M,\mathrm{Dr}}+\mathrm{\Δ}{S}_{h,\mathrm{Dr}}=h-(S_{\mathrm{Dr}0}+\frac{P-P_0}{{2M}_{\mathrm{Dr}}})+\frac{Q\·({P_{\mathrm{Dr}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Dr}}}---\left(4\right)$

In formula, Δ S _{m, Dr}-the i-th passage transmission side roll gap regulation value, mm; Δ S _{h, Dr}-the i-th passage transmission side correction roll gap regulation value, mm; H-the i-th passage transmission side exit thickness, mm; S _dr0-the i-th passage transmission side fixed value of roller slit, mm; P-the i-th passage setting roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-mill drive side rigidity, kN/mm; Q, Q '-i-th passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-th-1 passage transmission side actual measurement roll-force, MN; P '-the i-th-1 passage setting roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total for transmission side roll gap regulation value Δ S _drdeduct fore side total roll gap regulation value Δ S _op, the roll gap tilt adjustments setting value Δ S of the i-th passage when rolling can be obtained.

Further, described control method belongs to pre-control, be applied to R2 roughing mill every time sting steel before.

The invention provides a kind of autocontrol method improving camber of intermediate slab in rough rolling for milling train both sides rigidity the different and unreasonable problem of roll gap tilt adjustments, camber roll gap pre-adjustment value is calculated according to setting data, pre-control is carried out to camber, avoid camber trend expansion and by camber shape controlling in more among a small circle; The camber problem simultaneously left over for front passage, calculates the roll gap regulation value revising camber, effectively can control, thus effectively improve the precision of automatic control model in this passage to the camber shape left over according to front passage measured data.

Accompanying drawing explanation

The roll gap tilt adjustments setting value Δ S calculation flow chart of the autocontrol method of the improvement camber of intermediate slab in rough rolling that Fig. 1 provides for the embodiment of the present invention.

The schematic diagram of the calculating operation side roll gap regulation value of the autocontrol method of the improvement camber of intermediate slab in rough rolling that Fig. 2 provides for the embodiment of the present invention.

Detailed description of the invention

A kind of autocontrol method improving camber of intermediate slab in rough rolling that the embodiment of the present invention provides, being the roll gap tilt adjustments value by setting this passage and the roll gap tilt adjustments value revising upper a time outlet camber, calculating the roll gap tilt adjustments setting value of each passage when rolling.

Produce the roll gap tilt adjustments setting value Δ S of camber during rolling and comprise two parts: a part is for milling train both sides poor rigidity and roll gap tilt adjustments value is unreasonable carries out preconditioning, and the one-sided adjusted value of its roll gap is designated as Δ S _m; A part revises the camber of upper a time generation, and the one-sided adjusted value of its roll gap is Δ S _h.Then from the 1st passage, the calculating of every time roll gap tilt adjustments setting value Δ S is carried out according to step as shown in Figure 1.

See Fig. 2, for the i-th passage fore side, when not considering the thickness deviation caused in i-th-1 passage (namely the going up a time) operation of rolling, because milling train both sides rigidity is uneven and roll gap tilt adjustments value is unreasonable, fore side fixed value of roller slit S _op0corresponding exit thickness is h _op0, in order to revise this exit thickness deviation, needing fore side roll gap regulation is S _op1, then the roll gap regulation value Δ S of the i-th passage fore side _{m, Op}can be calculated by calculating formula (1).

${\mathrm{\ΔS}}_{M,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})---\left(1\right)$

In formula, P ₀-acyclic homologically trioial roll-force, MN; M _op-milling train fore side rigidity, kN/mm; P-the i-th passage setting roll-force, MN; H-the i-th passage fore side exit thickness, mm; S _op0-the i-th passage fore side fixed value of roller slit, mm; Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm;

Due to the thickness deviation that the i-th-1 passage is left over, after carrying out preconditioning to the i-th passage fore side roll gap, fore side exit thickness is h _op1, the fore side exit thickness deviation that the thickness deviation left over to revise the i-th-1 passage causes, needs the i-th passage fore side roll gap regulation to be modified to S _op, then the correction roll gap regulation value Δ S of the i-th passage fore side _{h, Op}can be calculated by calculating formula (2).

${\mathrm{\ΔS}}_{h,\mathrm{Op}}=\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(2\right)$

In formula, P '-the i-th-1 passage setting roll-force, MN; P _op'-i-th-1 passage fore side actual measurement roll-force, MN; Q-the i-th passage strip plastic deformation coefficient, MN/mm; Q '-the i-th-1 passage strip plastic deformation coefficient, MN/mm; M _op-milling train fore side rigidity, kN/mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm;

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, can obtain the i-th passage fore side total roll gap regulation value Δ S _op:

${\mathrm{\ΔS}}_{\mathrm{Op}}=\mathrm{\Δ}{S}_{M,\mathrm{Op}}+{\mathrm{\ΔS}}_{h,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})+\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(3\right)$

In formula, Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm; H-the i-th passage fore side exit thickness, mm;

According to the i-th passage fore side total roll gap regulation value Δ S _opidentical computational methods, can obtain transmission side total roll gap regulation value Δ S by calculating formula (4) _dr:

${\mathrm{\ΔS}}_{\mathrm{Dr}}={\mathrm{\ΔS}}_{M,\mathrm{Dr}}+\mathrm{\Δ}{S}_{h,\mathrm{Dr}}=h-(S_{\mathrm{Dr}0}+\frac{P-P_0}{{2M}_{\mathrm{Dr}}})+\frac{Q\·({P_{\mathrm{Dr}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Dr}}}---\left(4\right)$

In formula, Δ S _{m, Dr}-the i-th passage transmission side roll gap regulation value, mm; Δ S _{h, Dr}-the i-th passage transmission side correction roll gap regulation value, mm; H-the i-th passage transmission side exit thickness, mm; S _dr0-the i-th passage transmission side fixed value of roller slit, mm; P-the i-th passage setting roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-mill drive side rigidity, kN/mm; Q, Q '-i-th passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-th-1 passage transmission side actual measurement roll-force, MN; P '-the i-th-1 passage setting roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total for transmission side roll gap regulation value Δ S _drdeduct fore side total roll gap regulation value Δ S _op, the roll gap tilt adjustments setting value Δ S of the i-th passage during rolling can be obtained.So far, the setup algorithm of the pre-control camber of this passage is completed.

Now for the roll gap tilt adjustments of M3A22 intermediate blank in the rougher of hot strip mill unit operation of rolling, the autocontrol method improving camber of intermediate slab in rough rolling provided by the invention is illustrated.

For the fore side of M3A22 rolling, a rolling process thickness rolls 44mm by 217mm, the wide 1660mm of plate, and roughing adopts common 1+5 pattern, and R2 mill milling five passages complete rolling, and each passage technological parameter is as shown in table 1.

Table 1M3A22 (217-44 × 1660mm) passage actual process parameter

Roll gap regulation value Δ S for camber comprises two parts: a part is for milling train both sides poor rigidity and roll gap tilt adjustments value is unreasonable carries out preconditioning, and the one-sided adjusted value of its roll gap is designated as Δ S _m; A part revises the camber of upper a time generation, and the one-sided adjusted value of its roll gap is Δ S _h.Then, in accordance with the following steps from the 1st passage, the calculating of every time roll gap tilt adjustments value is carried out:

(1) from control module, read parameter to comprise: the parameter of the i-th-1 passage has actual measurement roll-force to be P ', strip plastic deformation coefficient Q ' and fore side actual measurement roll-force are P _op'; The parameter of the i-th passage has setting roll gap S, fore side original start roll gap S _op0, exit thickness h, calculates roll-force P and strip plastic deformation coefficient Q.

(2) when not considering the thickness deviation caused in i-1 passes process, because milling train both sides rigidity is uneven and roll gap tilt adjustments value is unreasonable, fore side fixed value of roller slit S _op0corresponding exit thickness is h _op0, in order to revise this exit thickness deviation, needing fore side roll gap regulation is S _op1, the roll gap regulation value Δ S of fore side _{m, Op}can be calculated by calculating formula (1).Each passage fore side roll gap regulation value Δ S _{m, Op}result of calculation as shown in table 2.

${\mathrm{\ΔS}}_{M,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})---\left(1\right)$

Table 2M3A22 (217-44 × 1660mm) calculating operation side each passage roll gap regulation value

Road number of times	1	2	3	4	5
						Fore side adjusted value Δ S M，Op/mm	-0.100	-0.625	-0.476	-0.476	-0.207

(3) due to the thickness deviation that i-1 passage is left over, after carrying out preconditioning to fore side roll gap, fore side exit thickness is h _op1.In order to revise the fore side exit thickness deviation that this reason causes, needing fore side roll gap regulation is S _op, a time fore side roll gap regulation value Δ S in correction _{h, Op}can be calculated by calculating formula (2).Each passage fore side correction roll gap regulation value Δ S _{h, Op}result of calculation as table 3.

${\mathrm{\ΔS}}_{h,\mathrm{Op}}=\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(2\right)$

Table 3M3A22 (217-44 × 1660mm) calculates revises upper a time fore side roll gap regulation value

Road number of times	1	2	3	4	5
						Fore side adjusted value Δ S h，Op/mm	—	-0.113	-0.120	-0.144	-0.119

"-" represents that this passage is without roll gap correction adjusted value.

(4) comprehensive (2) and (3) can obtain calculating formula (3), can obtain each passage fore side total roll gap regulation value Δ S by calculating formula (3) _op, result of calculation is in table 4.

${\mathrm{\ΔS}}_{\mathrm{Op}}=\mathrm{\Δ}{S}_{M,\mathrm{Op}}+{\mathrm{\ΔS}}_{h,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})+\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(3\right)$

The total roll gap regulation value in table 4M3A22 (217-44 × 1660mm) calculating operation side

Road number of times	1	2	3	4	5
						Fore side adjusted value Δ S Op/mm	-0.100	-0.738	-0.596	-0.620	-0.326

(5) transmission side total roll gap regulation value Δ S can in like manner be obtained _dr, each passage transmission side total roll gap regulation value Δ S can be obtained by calculating formula (4) _dr, result of calculation is as shown in table 5.

${\mathrm{\ΔS}}_{\mathrm{Dr}}={\mathrm{\ΔS}}_{M,\mathrm{Dr}}+\mathrm{\Δ}{S}_{h,\mathrm{Dr}}=h-(S_{\mathrm{Dr}0}+\frac{P-P_0}{{2M}_{\mathrm{Dr}}})+\frac{Q\·({P_{\mathrm{Dr}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Dr}}}---\left(4\right)$

Table 5M3A22 (217-44 × 1660mm) calculates the total roll gap regulation value of transmission side

Road number of times	1	2	3	4	5
						Transmission side adjusted value Δ S Dr/mm	0.312	1.064	0.894	0.897	0.578

Finally, by each passage transmission side total roll gap regulation value Δ S _drdeduct fore side total roll gap regulation value Δ S _op, obtain the setting value Δ S of the roll gap tilt adjustments of each passage of rolling, so far, complete the setup algorithm of the pre-control camber of each passage.Result of calculation is as table 6.

Table 6M3A22 (217-44 × 1660mm) calculates the total roll gap regulation value of each passage

Road number of times	1	2	3	4	5
						Total roll gap regulation value Δ S/mm	0.412	1.802	1.490	1.517	0.903

Using the setting value Δ S of the roll gap tilt adjustments of the above-mentioned each passage calculated as actual initial conditions, be applied in the actual intermesh determination of each passage before every time of R2 roughing mill stings steel, can in intermediate blank rough rolling process, effectively control slab and occur camber shape, thus effectively improve the precision of automatic control model, both handled easily, can well improve breakdown bar camber problem again.

It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (2)

1. one kind is improved the autocontrol method of camber of intermediate slab in rough rolling, be applicable to every time roll gap tilt adjustments of R2 roughing mill, it is characterized in that, the roll gap tilt adjustments value of the method by this passage of setting and the roll gap tilt adjustments value of correction upper a time outlet camber, calculate the roll gap tilt adjustments setting value of each passage when rolling, its computational process is as follows:

For the computational process of the i-th passage fore side, first by calculating formula (1):

${\mathrm{\ΔS}}_{M,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})---\left(1\right)$

Calculate the roll gap regulation value Δ S of the i-th passage fore side _{m, Op},

In formula, P ₀-acyclic homologically trioial roll-force, MN; M _op-milling train fore side rigidity, kN/mm; P-the i-th passage setting roll-force, MN; H-the i-th passage fore side exit thickness, mm; S _op0-the i-th passage fore side fixed value of roller slit, mm; Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm;

Then by calculating formula (2):

${\mathrm{\ΔS}}_{h,\mathrm{Op}}=\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Op}}}---\left(2\right)$

Calculate the correction roll gap regulation value Δ S of the i-th passage fore side _{h, Op};

In formula, P '-the i-th-1 passage setting roll-force, MN; P _op'-i-th-1 passage fore side actual measurement roll-force, MN; Q-the i-th passage strip plastic deformation coefficient, MN/mm; Q '-the i-th-1 passage strip plastic deformation coefficient, MN/mm; M _op-milling train fore side rigidity, kN/mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm;

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, calculate the i-th passage fore side total roll gap regulation value Δ S by calculating formula (3) _op:

${\mathrm{\ΔS}}_{\mathrm{Op}}={\mathrm{\ΔS}}_{M,\mathrm{Op}}+{\mathrm{\ΔS}}_{h,\mathrm{Op}}=h-(S_{\mathrm{Op}0}+\frac{P-P_0}{{2M}_{\mathrm{Op}}})+\frac{Q\·({P_{\mathrm{Op}}}^{\′}-P^{\′}/2)}{Q^{\′}{M}_{\mathrm{Op}}}---\left(3\right)$

In formula, Δ S _{m, Op}-the i-th passage fore side roll gap regulation value, mm; Δ S _{h, Op}-the i-th passage fore side correction roll gap regulation value, mm; H-the i-th passage fore side exit thickness, mm;

According to the i-th passage fore side total roll gap regulation value Δ S _opidentical computational methods, calculate transmission side total roll gap regulation value Δ S by calculating formula (4) _dr:

${\mathrm{\ΔS}}_{\mathrm{Dr}}={\mathrm{\ΔS}}_{M,\mathrm{Dr}}+{\mathrm{\ΔS}}_{h,\mathrm{Dr}}=h-(S_{\mathrm{Dr}0}+\frac{P-P_0}{{2M}_{\mathrm{Dr}}})+\frac{Q\·({P_{\mathrm{Dr}}}^{\′}-P^{\′}/2)}{Q^{\′}\·M_{\mathrm{Dr}}}---\left(4\right)$

In formula, Δ S _{m, Dr}-the i-th passage transmission side roll gap regulation value, mm; Δ S _{h, Dr}-the i-th passage transmission side correction roll gap regulation value, mm; H-the i-th passage transmission side exit thickness, mm; S _dr0-the i-th passage transmission side fixed value of roller slit, mm; P-the i-th passage setting roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-mill drive side rigidity, kN/mm; Q, Q '-i-th passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-th-1 passage transmission side actual measurement roll-force, MN; P '-the i-th-1 passage setting roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total for transmission side roll gap regulation value Δ S _drdeduct fore side total roll gap regulation value Δ S _op, the roll gap tilt adjustments setting value Δ S of the i-th passage when rolling can be obtained.

2. the autocontrol method improving camber of intermediate slab in rough rolling according to claim 1, is characterized in that: described control method belongs to pre-control, be applied to R2 roughing mill every time sting steel before.