CN103752623A - Automatic control method for improving camber of rough mill intermediate billet - Google Patents

Abstract

The invention provides an automatic control method for improving a camber of a rough mill intermediate billet and belongs to the mechanical automation control field. The control method comprises two steps of setting a roll gap inclination adjusting value of a current pass and modifying a roll gap inclination adjusting value of a last process outlet camber; the roll gap inclination adjusting value of the current pass can be obtained by calculating an analysis model according to a set roll force, a set outlet thickness, set values of roll gaps of two sides, a zero adjustment roll force and stiffness values of rolling mills on two sides; and the roll gap inclination adjusting value of the last process outlet camber can be obtained by calculating a plate billet plastic deformation coefficient of the pass, actually-measured roll force of two sides and the plate billet plastic deformation coefficient of the last pass. According to the control method, an actual process parameter on the site is used as an input condition; an automatic control model is improved; the camber of the intermediate billet camber is effectively; the control method is convenient to operate; and the problem of the camber of the intermediate billet camber can be well improved.

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 that improves 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 produce the phenomenon of horizontal direction bending, is called camber, especially head, tail camber phenomenon is serious.The main cause that produces camber phenomenon has: intermediate blank both sides temperature difference; The intermediate blank bending that constant width machine causes; Both sides mill stiffness difference; Memorial archway and bearing block excesssive gap; Flipper guide centering is bad etc.The camber of intermediate blank is very big to finish rolling Influence of production, can cause being with steel to occur the accidents such as whipping, heap steel, has a strong impact on normal production.

For breakdown bar camber problem, in actual production at present, roll gap tilt adjustments mainly relies on manual adjustment, and accuracy relies on operator's experience, 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.For example, method described in patent JP11188415A and CN101934292A be by this passage of milling train both sides rolling force deviation both sides roll gap is carried out in real time adjusting and controlling camber, but the method is not considered the impact of milling train both sides stiffness difference on camber; Method described in patent CN102728625A is to realize both sides rolling equilibrium of forces by real-time adjustment both sides roll gap, and has considered the difference of both sides mill stiffnesses, but there is no the thickness deviation problem of considering that front 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 by automatic control reponse system, calculate roll gap tilt adjustments value and control camber, 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 that improves camber of intermediate slab in rough rolling, can more effectively realize the control of breakdown bar camber.

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

Take i passage fore side as example, 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 adjusted value Δ S of i 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 passage is set roll-force, MN; H-the i passage fore side exit thickness, mm; S _op0the-the i passage fore side fixed value of roller slit, mm; Δ S _{m, Op}the-the i passage fore side roll gap adjusted 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 adjusted value Δ S of i passage fore side _{h, Op};

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

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, by calculating formula (3), calculate the total roll gap adjusted value of i passage fore side 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-the i passage fore side roll gap adjusted value, mm; Δ S _{h, Op}the-the i passage fore side correction roll gap adjusted value, mm; H-the i passage fore side exit thickness, mm;

According to the total roll gap adjusted value of i passage fore side Δ S _opidentical computational methods, calculate the total roll gap adjusted value of transmission side 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-the i passage transmission side roll gap adjusted value, mm; Δ S _{h, Dr}the-the i passage transmission side correction roll gap adjusted value, mm; H-the i passage transmission side exit thickness, mm; S _dr0the-the i passage transmission side fixed value of roller slit, mm; P-the i passage is set roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-milling train transmission side rigidity, kN/mm; Q, Q '-the i passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-1 passage transmission side actual measurement roll-force, MN; P '-the i-1 passage is set roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total transmission side roll gap adjusted value Δ S _drdeduct the total roll gap adjusted value of fore side Δ S _op, can obtain the roll gap tilt adjustments setting value Δ S of i passage when rolling.

Further, described control method belongs to pre-control, and every time that is applied to R2 roughing mill stung before steel.

The invention provides a kind of autocontrol method that improves camber of intermediate slab in rough rolling for milling train both sides rigidity difference and the unreasonable problem of roll gap tilt adjustments, according to setting data, calculate camber roll gap pre-adjustment value, camber is carried out to pre-control, in avoiding the expansion of camber trend and camber shape being controlled at more among a small circle; The camber problem of simultaneously leaving over for front passage, calculates the roll gap adjusted value of revising camber according to front passage measured data, can to the camber shape of leaving over, effectively control in this passage, thereby effectively improve the precision of automatic control model.

Accompanying drawing explanation

The roll gap tilt adjustments setting value Δ S calculation flow chart of the autocontrol method that improves 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 adjusted value of the autocontrol method that improves camber of intermediate slab in rough rolling that Fig. 2 provides for the embodiment of the present invention.

The specific embodiment

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

The roll gap tilt adjustments setting value Δ S that produces camber during rolling 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 is to revise the camber that upper a time produces, and the one-sided adjusted value of its roll gap is Δ S _h.Then according to step is since the 1st passage as shown in Figure 1, the roll gap tilt adjustments of carrying out every time sets value the calculating of Δ S.

Referring to Fig. 2, take i passage fore side as example, when not considering the thickness deviation causing in i-1 passage (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, fore side roll gap need to be adjusted into S _op1, the roll gap adjusted value Δ S of i 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 passage is set roll-force, MN; H-the i passage fore side exit thickness, mm; S _op0the-the i passage fore side fixed value of roller slit, mm; Δ S _{m, Op}the-the i passage fore side roll gap adjusted value, mm;

Due to the thickness deviation that i-1 passage is left over, i passage fore side roll gap is being carried out after preconditioning, fore side exit thickness is h _op1, the fore side exit thickness deviation causing in order to revise thickness deviation that i-1 passage leaves over, need to be modified to S by the adjustment of i passage fore side roll gap _op, the correction roll gap adjusted value Δ S of i 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-1 passage is set roll-force, MN; P _op'-i-1 passage fore side actual measurement roll-force, MN; Q-the i passage strip plastic deformation coefficient, MN/mm; Q '-the i-1 passage strip plastic deformation coefficient, MN/mm; M _op-milling train fore side rigidity, kN/mm; Δ S _{h, Op}the-the i passage fore side correction roll gap adjusted value, mm;

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, can obtain the total roll gap adjusted value of i passage fore side 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-the i passage fore side roll gap adjusted value, mm; Δ S _{h, Op}the-the i passage fore side correction roll gap adjusted value, mm; H-the i passage fore side exit thickness, mm;

According to the total roll gap adjusted value of i passage fore side Δ S _opidentical computational methods, can obtain the total roll gap adjusted value of transmission side 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-the i passage transmission side roll gap adjusted value, mm; Δ S _{h, Dr}the-the i passage transmission side correction roll gap adjusted value, mm; H-the i passage transmission side exit thickness, mm; S _dr0the-the i passage transmission side fixed value of roller slit, mm; P-the i passage is set roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-milling train transmission side rigidity, kN/mm; Q, Q '-the i passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-1 passage transmission side actual measurement roll-force, MN; P '-the i-1 passage is set roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total transmission side roll gap adjusted value Δ S _drdeduct the total roll gap adjusted value of fore side Δ S _op, the roll gap tilt adjustments of i passage setting value Δ S in the time of can obtaining rolling.So far, the setting that has completed the pre-control camber of this passage is calculated.

Now take M3A22 intermediate blank, the roll gap tilt adjustments in the rougher of hot strip mill unit operation of rolling, as example, illustrates the autocontrol method that improves camber of intermediate slab in rough rolling provided by the invention.

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

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

Roll gap adjusted 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 is to revise the camber that upper a time produces, and the one-sided adjusted value of its roll gap is Δ S _h.Then in accordance with the following steps since the 1st passage, carry out the calculating of every time roll gap tilt adjustments value:

(1) from control module, reading parameter comprises: it is P ' that the parameter of i-1 passage has actual measurement roll-force, and strip plastic deformation coefficient Q ' and fore side actual measurement roll-force are P _op'; The parameter of i passage has the roll gap of setting 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 causing in the i-1 passage 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, fore side roll gap need to be adjusted into S _op1, the roll gap adjusted value Δ S of fore side _{m, Op}can be calculated by calculating formula (1).Each passage fore side roll gap adjusted value Δ S _{m, Op}result of calculation as shown in table 2.

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

The each passage roll gap of table 2M3A22 (217-44 × 1660mm) calculating operation side adjusted 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) thickness deviation of leaving over due to i-1 passage, is carrying out after preconditioning fore side roll gap, and fore side exit thickness is h _op1.The fore side exit thickness deviation causing in order to revise this reason, need to be adjusted into S by fore side roll gap _op, a time fore side roll gap adjusted value Δ S in correction _{h, Op}can be calculated by calculating formula (2).Each passage fore side correction roll gap adjusted 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 and revises upper a time fore side roll gap adjusted 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), by calculating formula (3), can obtain the total roll gap adjusted value of each passage fore side Δ S _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 adjusted value of 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) in like manner can obtain the total roll gap adjusted value of transmission side Δ S _dr, by calculating formula (4), can obtain the total roll gap adjusted value of each passage transmission side Δ S _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 adjusted 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 the total roll gap adjusted value of each passage transmission side Δ S _drdeduct the total roll gap adjusted value of fore side Δ S _op, obtained the setting value Δ S of the roll gap tilt adjustments of the each passage of rolling, so far, the setting that has completed the pre-control camber of each passage is calculated.Result of calculation is as table 6.

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

Road number of times	1	2	3	4	5
						Total roll gap adjusted 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 calculating as actual initial conditions, before stinging steel, every time of R2 roughing mill be applied in the actual intermesh determination of each passage, can be in intermediate blank rough rolling process, effectively control slab and occur camber shape, thereby effectively improved the precision of automatic control model, both handled easily, can well improve again breakdown bar camber problem.

It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope 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 method is by setting the roll gap tilt adjustments value of this passage and revising the above roll gap tilt adjustments value of a time outlet camber, calculate the roll gap tilt adjustments setting value of each passage when rolling, its computational process is as follows:

Take i passage fore side as example, 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 adjusted value Δ S of i 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 passage is set roll-force, MN; H-the i passage fore side exit thickness, mm; S _op0the-the i passage fore side fixed value of roller slit, mm; Δ S _{m, Op}the-the i passage fore side roll gap adjusted 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 adjusted value Δ S of i passage fore side _{h, Op};

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

Simultaneous calculating formula (1) and (2) obtain calculating formula (3) again, by calculating formula (3), calculate the total roll gap adjusted value of i passage fore side 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-the i passage fore side roll gap adjusted value, mm; Δ S _{h, Op}the-the i passage fore side correction roll gap adjusted value, mm; H-the i passage fore side exit thickness, mm;

According to the total roll gap adjusted value of i passage fore side Δ S _opidentical computational methods, calculate the total roll gap adjusted value of transmission side 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-the i passage transmission side roll gap adjusted value, mm; Δ S _{h, Dr}the-the i passage transmission side correction roll gap adjusted value, mm; H-the i passage transmission side exit thickness, mm; S _dr0the-the i passage transmission side fixed value of roller slit, mm; P-the i passage is set roll-force, MN; P ₀-acyclic homologically trioial roll-force, MN; M _dr-milling train transmission side rigidity, kN/mm; Q, Q '-the i passage and i-1 passage strip plastic deformation coefficient, MN/mm; P _dr'-i-1 passage transmission side actual measurement roll-force, MN; P '-the i-1 passage is set roll-force, MN; M _dr-milling train fore side rigidity, kN/mm;

Finally, by total transmission side roll gap adjusted value Δ S _drdeduct the total roll gap adjusted value of fore side Δ S _op, can obtain the roll gap tilt adjustments setting value Δ S of i passage when rolling.

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

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