US 12,667,875 B2Granted

Method for preheating a working roll for rolling

AssigneeConstellium Issoire

InventorsRomain-Fabrice Bernes, Daniel Bellot, Vincent Duhoux, Clement Questroy, Jean-François Verdier

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Abstract

A method for preheating at least one working roll of a rolling mill. The method including determining a target thermal expansion profile of the working roll, determining an effective mean temperature profile of longitudinal segments of the working roll, determining a target mean temperature profile, and activating a plurality of inductors distributed along the working roll in order to reduce a difference between the effective mean temperature and the target mean temperature.

Claims18

Dependent claims

A process for preheating at least one work roll of a rolling mill intended to roll a metallic strip so that the at least one work roll has a target thermal expansion profile

(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
determined along longitudinal segments Ns of the at least one work roll, the rolling mill including a thermal control device including induction coils Ni distributed along a longitudinal axis of the at least one work roll facing the longitudinal segments Ns, the process comprising the following phases:
a. determining the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
,
at a calculation time tk,
based on predefined values of input parameters Pe representative of dimensions and mechanical and thermal properties of the metallic strip to be rolled,
and using a first predefined physical model M1 to express a relationship between the input parameters Pe and the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
;
b. determining an effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
along longitudinal segments Ns of the at least one work roll,
based on a measured effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
-
1
)
)
1
≤
i
≤
Ni
generated by the induction coils Ni,
and using a second predefined physical model M2 to express a relationship between the effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ni
and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
;
c. determining a target mean temperature profile
(
T
_
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
along the longitudinal segments Ns of the at least one work roll, based on the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
determined and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
determined;
d. determining a deviation ΔT(tk) between the target mean temperature profile
(
T
_
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
;
e. determining a convergence criterion based on the deviation ΔT(tk) determined, and stopping the preheating process when the convergence criterion is satisfied, and continuing the preheating process when the convergence criterion is not satisfied;
f. activation of the induction coils including the following:
determining a target thermal power profile
(
P
Q
⁡
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ni
to be supplied by the induction coils Ni based on the deviation Δ{circumflex over (T)}(tk) determined;
activating the induction coils such that the induction coils supply the target thermal power profile
(
P
Q
⁡
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ni
determined;
measuring an effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ni
actually supplied by the induction coils;
g. repeating b to f until the convergence criterion is satisfied, by incrementing the calculation time tk.

281 more elements

Dependencies are inferred from the claim text.

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Abstract

A process for preheating at least one work roll of a rolling mill intended to roll a metallic strip so that the at least one work roll has a target thermal expansion profile

(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
determined along longitudinal segments Ns of the at least one work roll, the rolling mill including a thermal control device including induction coils Ni distributed along a longitudinal axis of the at least one work roll facing the longitudinal segments Ns, the process comprising the following phases:
a. determining the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
,
at a calculation time tk,
based on predefined values of input parameters Pe representative of dimensions and mechanical and thermal properties of the metallic strip to be rolled,
and using a first predefined physical model M1 to express a relationship between the input parameters Pe and the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
)
1
≤
i
≤
Ns
;
b. determining an effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
along longitudinal segments Ns of the at least one work roll,
based on a measured effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
-
1
)
)
1
≤
i
≤
Ni
generated by the induction coils Ni,
and using a second predefined physical model M2 to express a relationship between the effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ni
and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
;
c. determining a target mean temperature profile
(
T
_
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
along the longitudinal segments Ns of the at least one work roll, based on the target thermal expansion profile
(
Δ
⁢
d
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
determined and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
determined;
d. determining a deviation ΔT(tk) between the target mean temperature profile
(
T
_
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ns
and the effective mean temperature profile
(
T
_
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ns
;
e. determining a convergence criterion based on the deviation ΔT(tk) determined, and stopping the preheating process when the convergence criterion is satisfied, and continuing the preheating process when the convergence criterion is not satisfied;
f. activation of the induction coils including the following:
determining a target thermal power profile
(
P
Q
⁡
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ni
to be supplied by the induction coils Ni based on the deviation Δ{circumflex over (T)}(tk) determined;
activating the induction coils such that the induction coils supply the target thermal power profile
(
P
Q
⁡
(
i
)
c
(
t
k
)
)
1
≤
i
≤
Ni
determined;
measuring an effective thermal power profile
(
P
Q
⁡
(
i
)
eff
(
t
k
)
)
1
≤
i
≤
Ni
actually supplied by the induction coils;
g. repeating b to f until the convergence criterion is satisfied, by incrementing the calculation time tk.

281 more elements