JPS58192611A - Setup device of rolling mill - Google Patents

Abstract

PURPOSE:To obtain a titled device capable of rolling with high accuracy from the tip, by constitution so that a circumferential speed and a bending pressure of a work roll, a position of an intermediate roll, etc. which are calculated in accordance with specifications of a rolling material are corrected and controlled by the previous actual results. CONSTITUTION:In a sextuple rolling mill for rolling a rolling material 1, consisting of work rolls 10, 10', intermediate rolls 11, 11' movalbe in the roll shaft direction and backup rolls 12, 12', information of specifications of the following rolling material is obtained from a rolling storage device 13, in accordance with which control values are calculated by an intermediate roll position deciding device 14, a bending pressure deciding device 16, a roll circumferential speed deciding device 18, a rolling load calculating device 20, a draft position calculating device 22, etc., respectively, also said control values are corrected by a coefficient of correction based on the actual result values obtained from an intermediate roll position detector 24, a bending pressure detector 25, a shape detector 23, a rolling load detector 28, etc., and a bending device 17, an intermediate roll shift device 15, a roll driving device 19 and a rolling reduction driving device 15 are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a set-up device for a rolling mill, and is particularly suitable for setting up the finished plate thickness and shape of a six-layer rolling mill having intermediate rolls movable in the roll axis direction. This invention relates to a setup device for a rolling mill.

It is known that a six-layer rolling mill has intermediate rolls and has excellent shape control performance. At the time of set-up, a method of initial setting and dynamic control of the intermediate roll axis movement amount and roll pending roller by means of shape control has already been put into practical use as in Japanese Patent Publication No. 7425/1983. However, some of the set-up conditions are determined based on experience, and compared to conventional quadruple rolling mills, the thickness in the longitudinal direction of the rolling machine can be rolled with high precision to one thickness from the tip. It was difficult.

An object of the present invention is to provide a rolling mill setup device iL that is capable of rolling a rolled material from the tip with high accuracy in both shape and thickness in a rolling mill.

In the present invention, the reduction tr (roll gap) and milling speed setting values are all calculated and preset, and are adaptively corrected by a corresponding model type fully adaptive control device based on actual rolling results.

FIG. 1 is a front view showing the schematic structure of a six-layer mill. A group of 30 L rolls is arranged with the rolled material SB interposed therebetween. Pack-up opening from the outside”1, inside 1’iJ]
It is disposed between the rolls 2 and the work rolls 3, and applies a predetermined pressure to the rolled material SBK. As shown in the figure, the intermediate roll 2 is movable in the axial direction, and in a six-layer mill, control over the intermediate roll 2 is newly required. Here, the intermediate roll position X is defined by the following equation.

X=b+2HcJ・・・・・・・・・・・・
・・・・・・(1) After the first generation, the plate width of the rolled material SB is b1
Distance a'k between the end of the broken rolled material SB and the end of the intermediate roll 2
1. The well-known gauge meter formula can be applied as a setting model for the rolling position for rolling to the target thickness, but in the 6-layer mill, the shadow of the intermediate roll position dX mentioned above*t-considered. There is a need to. For this purpose, it is given as Equation 6.1 [Mill spring constant MOO4-12th in Equation MILL.

(However, MsOO is the spring constant at zero adjustment at intermediate roll position X, the spring constant per unit length between KWri work rolls, and BL is the barrel length) Spring constant at zero adjustment M g
00 is given by the following formula.

Mzoo= 1116 X+ Ml
+es +++-・falC However, a, a and m are constants specific to Mill) @ Figures 2 and 3 show the results of experimental confirmation of the spring constants shown in equations (2) and (3). It is.

FIG. 2 is a graph showing the spring constant at each position when the intermediate roll 1r is shifted in a state in which there is no material to be rolled (C zero adjustment state), and shows that equation (3) is effective. Figure 783 is a plot of the spring constant for each plate width when the intermediate roll position is fixed and the temporarily rolled material is made into a 111 t f plate, and these experiments have confirmed that the present spring constant formula is effective. . The processing of the present invention using such a spring constant will be explained next.

FIG. 4 is a flowchart showing the setup process 4 of the 6J1 type mill according to the present invention.

First, in step 41, the rolling specifications for the material to be rolled, such as the steel type, plate width, and plate thickness, are determined and stored in the memory. @ is set to bl target plate thickness (-h), and in step 42, the rolling load P is determined by the H-hole formula, which is an approximation of the well-known Blanc-dipord formula.

p=zpkbVi] Hundred mouths 1) QM Q # ・
−・−・・−(41 (However, k is the deformation resistance, zp is the adaptive correction coefficient, R′ is the flat roll diameter, QM is the correction term including the friction coefficient, Q, ii is the tension correction term) The diameter R' of the flat roll in equation (4) can be calculated using the following equation.

(where f is the diameter of the R-shaped work roll 3 and CwFi is the Hitchcock constant) That is, the rolling fI-P can be determined by substituting the equation (5) into the equation (4). Further, the optimum intermediate roll position aX and the setting of the pending force Q with the shape pre-layered are determined by the method disclosed in, for example, Japanese Patent Publication No. 52-7425, and are processed in steps 43 and 44.

X=b+Ha a I−ΔX) ・・・・・・・・・
・・・・・・・・・(6) Q='lsP 10m, +ΔQ
・・・・・・・・・・・・・・・(7) CHowever, H
a J and jQFi correction amount corrected by the adaptive correction device described later; 1. (and a4 is a function of the plate width and is determined in advance by the mill characteristics) Next, the reduction setting amount 8 is the pressure [load IP
, It can be calculated from the following equation using the middle 150 mx, the roll pending force Q, and the spring constants of equations (2) and (3).

(However, Px is rolling load at zero adjustment, ρ is oil M thickness compensation, ρ
2 is the 4-timing oil film thickness compensation, and 1 is the provisional load correction value, which is expressed by the following formula, a=azcpo+a* (Bs, -b), and ax
cK) is expressed as X+all az 00 = 6 '', where as*a@e ``1 is the mill-specific foot clearance, SO is the roll gap reference position, and ΔS is the adaptive correction coefficient) 18th ) The roll reduction lower dt is determined in step 45 based on the set reduction amount S calculated based on equation (b), and then, in step 46, the roll speed %J is determined by a known method.

By the way, it is necessary to calculate the adaptive correction coefficient 1j based on the actual rolling results every time the rolled material is rolled. However, in the 6-type mill, it is necessary to make adaptations to the intermediate roll position The adaptive correction method of the present invention will be explained below.

As shown in Fig. 5, the shape defect A at x=x, ,
lI f91 formula, 11th (from formula 1 next correction coefficient ΔX,
Calculate jQ.

[However, X m is the intermediate roll position based on actual results,
= b + Hc δMu Q Muke roll pending performance.

Qhc=a s P A + a 4 #) In addition, the shape defect characteristic in the fifth factor is Δ=”*o
” ” + J46 x'.
-Next, FIG. 6 shows one implementation of the present invention that realizes the above setup process. The figure shows the configuration of the device when applied to a 6-layer rolling mill.

The 6ji rolling mill has a work roll 10.10', an intermediate roll 11.11' and a backup roll 12.12'.
The rolled material SB is composed of intermediate rolls 11.
The roll is rolled by the upper and lower roll groups while the shape is corrected by the axial movement of the roll 11'. The controls for this rolling mill include drive of the work rolls, shift control of the medium I50-roll, and bending pressure control for the work rolls. These controls are performed by the rolling specification storage device 13 and the intermediate roll positioning furnace device 1.
4. Intermediate roll shift group fill 5. Bending pressure determination device [16. Bending device 117, Roll circumference speed calculation 1fi device RJI7L18, O-ru GA device A19, Rolling load detector +1120. a rigidity coefficient calculation device 21, a rolling position calculation device 1 and 22, a shape detector 23, an intermediate roll position detector 24, a bending pressure detector 25, a shape parameter conversion device 26, a mold correction coefficient calculation device 2
7 and a rolling load detector 28.

The rolling specification storage device 13 stores a type of next rolling material, base material sawa,
Rolling specifications such as Iiyama and target plate thickness are stored. Using this information, roll circumferential speed adjustment #18 calculates roll circumferential speed VB using the following equation.

VmfI i, h, b) -old---Jl
) Advanced rate fFi in the uth equation, known 0BIJlrld
Calculated using the &F'0rdO formula. The roll circumferential speed vII is then output to the roll drive device 119.

Next, in the rolling load detector rjk20, the hth (4th) is detected.

Calculate the rolling load P using equation (5). The following model formula is used to calculate the deformation resistance of this (4) martial gate.

k=fl t Ω, R, H, h, Vm)
”=・=Q3) Mata, middle M O-k position alt 5 +t 14 tri, 6th: by middle roll position m
xvr is calculated and output to intermediate roll shaft equipment +t15. Similarly, the bending pressure calculation device 116
) is used to calculate the optimum work roll bending pressure Qt and output it to the pending device 117. Here, the (61st
The next correction coefficient ΔX1 in the formula and the next correction coefficient ΔQ of Rikibumon used in the bending pressure calculation device 116
Fi can be obtained as follows. That is, the actual shape of the previously rolled material is taken in from the shape detector 23, and the shape parameter converter 126 converts it into the shape factor Δ. .

A46 is determined and output to the model correction coefficient calculation device 27. Next, the intermediate roll position 1i1-A of the previously rolled material which has been exposed by the intermediate roll position detector 24! The model correction coefficient is calculated by inputting the bending pressure performance Q of the previously rolled material taken in from the bending pressure detection 1525, and the rolling load performance P of the previously rolled material loaded into the rolling load detector 28. Each intermediate roll position calculation device 14 calculates ΔX and ΔQt- using the device 27th +91.01 formula.
and output to the bending pressure calculation device 16.

On the other hand, the mill stiffness coefficient calculating device 121 calculates the intermediate roll position
21. The mill stiffness coefficient M and the mill stiffness coefficient Mm at zero adjustment are calculated from the +31 formula. Furthermore, the following 11th
), (Calculate the low load correction value a and the low load correction #Lax at the time of zero shrine using Equation 13, respectively.

Jl=ag(X)+as (Bt, -b)
mm (14) where, axon: Low load correction value at intermediate roll position
・・” ・・・u!9 Here, '14 * aI: constant Finally, the rolling position calculation device 11122 calculates the spring constants M, Mz and constant m, which are the outputs of the mill stiffness coefficient calculation device 21.
a * a s, the rolling load P1 which is the output of the rolling load calculating device 1120, and the bending pressure calculating device f16
The pressure lower part *St is calculated using the equation 18), where Qt is the output of - manual power. Oil film thickness compensation ρ FL in equation (8)
The following model formula is based on the Eynolds formula.
Calculated from r.

/)=fs (Cam, P, Vm, L, D
) -*----am (lf9, Cat: diameter of journal bearing + 1lll) Clearance L: bearing width D and journal diameter Thus, intermediate roll position 11tX, bending pressure Q10 - roll circumferential speed Vm, and reduction Each set-up value for the position S is obtained.The intermediate roll shaft device [t15] sets the intermediate rolls 11° and 11' at the optimal position at the intermediate roll position X determined by the intermediate roll calculation device 14. The bending device 11117 calculates the bending pressure Q calculated by the bending pressure calculation device 16.
Adjust the optimal work roll bending pressure.

Roll drive device f19#-j, roll peripheral speed calculation device t1
The work roll circumferential speed is set at the optimum roll circumferential speed V 凰 obtained from 8. Further, the roll-down drive device 15 sets the roll roll-down position to the optimal roll-down position S calculated by the roll-down position calculation bag (t22).

With the above configuration, the set-up values of bending pressure, intermediate roll position, roll circumferential speed, and rolling position calculated before rolling of the rolled material can be set in advance in the 6-layer rolling mill. Rolling with high precision in both shape and thickness is possible from the tip of the sheet.

As is clear from the above, according to the present invention, it is possible to roll the rolled material from the tip with high precision in both shape and thickness.

[Brief explanation of drawings]

Figure 1 is a front view showing the schematic structure of a six-layer mill, Figure 2 is a spring constant characteristic diagram when there is no material to be rolled, and Figure 3 is the spring constant when the plate width t of the rolled material is varied. FIG. 4 is a flowchart showing the setup process of a six-layer mill according to the present invention, FIG. 5 is a shape failure value characteristic diagram according to the present invention, and FIG. 6 is a block diagram showing an embodiment of the present invention. be. 10.10'...work roll, 11.11'...
Intermediate roll, 12.12'...backup roll,
13... Rolling specification storage device, 14... Intermediate roll shift device, 15... Intermediate roll shift device, 16...
- Bending pressure determination device, 17... Bending device, 18... Roll peripheral speed calculation device, 19... Roll drive device, 20... Rolling oT1 calculation device, 21...
22... Rolling down position calculation device,
23... Shape detector, 24... Intermediate roll position detector, 25... Bending pressure detector, 26... Shape parameter conversion device, 27... Model modification coefficient calculation device, 28-B: a#ffi*If:l!・
1. Wow. Agent Patent Attorney Moe Takahashi! 1, 1 kaya hard / kaya 2nd τ 4be 3rd mouth Arashi kaya 4-2 1, r 1st

Claims (1)

[Claims] 1. It has an intermediate roll that can be moved in the roll axis direction, and the rolling load and rolling depth are adjusted based on the specifications of the material to be rolled.
In a 6-heavy rolling mill that performs rolling by determining #, a first calculation unit calculates a rolling load based on the specifications of the material to be rolled next time,
a second calculation unit that calculates an i positive coefficient based on the actual bending pressure and the intermediate roll position #; and a third calculation unit that calculates the intermediate roll position and the bending pressure based on the correction coefficient and the rolling specification. a fourth calculation unit that calculates the rolling force It using each of the bending pressure calculated by the third calculation unit, the rolling charge and the constant constant calculated by the first calculation unit; ,
A setup device for a rolling mill, comprising: a fifth calculation section that calculates a roll speed If based on the rolling specifications.