Method of emulsion concentration optimization for cold continuous rolling mill set

Patent metadata

Field	Value
Publication number	US-11779975-B2
Application number	US-201917261478-A
Country	US
Kind code	B2
Filing date	Aug 16, 2019
Priority date	Sep 29, 2018
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

Disclosed is a method of emulsion concentration optimization for a cold continuous rolling mill set for achieving vibration suppression, the method comprising: defining the process parameters involved in the process of emulsion concentration optimization; setting an initial set value of an emulsion concentration comprehensive optimization target function for a cold continuous rolling mill set for achieving vibration suppression; calculating a bite angle of each stand; calculating a vibration determination index reference value of each stand; setting the emulsion concentration of each stand; calculating the outlet temperature of a strip steel of each stand; calculating the dynamic viscosity of an emulsion in a roll gap of each stand; calculating the oil film thickness in the roll gap of each stand; calculating the emulsion concentration comprehensive optimization target function; determining whether the inequation F(X)<F0 is established; determining whether the concentration of the emulsion exceeds a feasible region range, and outputting the optimal emulsion concentration set value.

First claim

The invention claimed is:

1. A method of emulsion concentration optimization for a cold continuous rolling mill set, comprising the following steps:
(a) acquiring apparatus characteristic parameters of a cold continuous rolling mill set;
(b) acquiring critical rolling process parameters of a strip material;
(c) acquiring process parameters involved in the process of emulsion concentration optimization;
(d) setting an initial set value of an emulsion concentration comprehensive optimization target function for a cold continuous rolling mill set for achieving vibration suppression: F 0 =1.0×10 10 ;
the executing order of steps (a) to (d) is not limited;
(e) calculating a bite angle α, of each stand;
(f) calculating a vibration determination index reference value ξ 0i of each stand;
(g) setting an emulsion concentration C i of each stand;
(h) calculating the outlet temperature T i of a strip steel of each stand;
(i) calculating the dynamic viscosity η 0i of an emulsion in a roll gap of each stand;
(j) calculating an oil film thickness ξ i in the roll gap of each stand;
(k) calculating the emulsion concentration comprehensive optimization target function F(X);
(l) determining whether the inequation F(X)<F 0 is established, if yes, then setting C i y =C i , F 0 =F(X) and turning to step (m); if no, directly turning to step (m);
(m) determining whether the emulsion concentration C i exceeds the range of a feasible region, if yes, turning to step (n); if no, turning to step (g), wherein the feasible region refers to a region from 0 to the maximum emulsion concentration allowed by the cold continuous rolling mill set;
(n) outputting the optimal emulsion concentration set value C i y , wherein C i y is the value of C i when the calculated value of F(X) is minimum in the feasible region; and
(o) adjusting and controlling the emulsion concentration of each stand according to the optimal emulsion concentration set value C i y in the step (n) by a control system of the cold continuous rolling mill set; and
in each formula, i represents the stand ordinal number of the cold continuous rolling mill set.

2. The method of claim 1 , wherein calculating the vibration determination index reference value ξ 0i of each stand in the step (f) comprising the following steps:
(f1) calculating an over-lubricated oil film thickness critical value ξ i + of each stand as follows:

it is assumed that when

γ
i

α
i

=

A
+

,

the roll gap is just in an over-lubricated status, wherein γ i is a neutral angle of each stand, and A + is an over-lubricated determining coefficient;
calculating to obtain

u
i
+

=

1

2
⁢

(

2
⁢

A
+

-
1

)

⁢

(

Δ
⁢

h
i

R
i
′

+

T

i
⁢
0

-

T

i
⁢
1

P
i

)

according to

α
i

=

Δ
⁢
h

i

R
i
′

,

wherein Δh i is the rolling reduction, Δh i =h 0i −h 1i , h 0i is the inlet thickness of each stand, h 1i is the outlet thickness of each stand, and R i ′ is the flattening radius of a work roll of the i th stand, and

γ
i

=

1
2

⁢

Δ
⁢

h
i

R
i
′

[

1
+

1

2
⁢

u
i

⁢

(

Δ
⁢

h
i

R
i

Assignees

• Baoshan Iron & Steel

Inventors

• Zheng Tao
• Wang Kangjian
• Li Shanqing
• Quan Jizhe
• Qu Peilei

Classifications

• B21B37/62 Primary

  by control of a hydraulic adjusting device · CPC title

• B21B27/10

  externally · CPC title

• B21B37/007

  Control for preventing or reducing vibration, chatter or chatter marks (B21B37/66 takes precedence) · CPC title

• B21B45/0251

  for strips, sheets, or plates · CPC title

• B21B45/0266

  Measuring or controlling thickness of liquid films · CPC title