Method for setting roll gap of sinusoidal corrugated rolling for metal composite plate

Patent metadata

Field	Value
Publication number	US-12023720-B2
Application number	US-202217683338-A
Country	US
Kind code	B2
Filing date	Feb 28, 2022
Priority date	Mar 1, 2021
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A method for setting a roll gap of sinusoidal corrugated rolling for a metal composite plate includes steps of: determining entrance thicknesses, exit thicknesses, a width, and a rolling temperature of a difficult-to-deform metal slab and an easy-to-deform metal slab; detecting a roll speed and an entrance speed of a metal composite slab, obtaining a roll radius and friction factors; determining parameters of a sinusoidal corrugating roll and a quantity of complete sinusoidal corrugations on the sinusoidal corrugating roll; then calculating a time required for a complete corrugated rolling; calculating a rolling force at any time during the sinusoidal corrugated rolling of the metal composite plate; and calculating the roll gap S of the corrugated rolling at any time according to the rolling force F, and configuring a rolling mill to have the roll gap S according to an actual rolling schedule before normal production.

First claim

What is claimed is:

1. A method for setting a roll gap of sinusoidal corrugated rolling for a metal composite plate, comprising steps of:
step 1: determining entrance thicknesses h 1i , and h 2i , exit thicknesses h 1f and h 2f , a width b, and a rolling temperature T temp of a difficult-to-deform metal slab and an easy-to-deform metal slab according to process data of a certain pass;
step 2: detecting a roll speed ω and an entrance speed ν 0 of a metal composite slab, obtaining a roll radius R 0 ; wherein a friction factor between a corrugating roll and the difficult-to-deform metal slab is m 1 , and a friction factor between a flat roll and the easy-to-deform metal slab is m 2 ;
step 3: determining parameters of a sinusoidal corrugating roll, wherein an amplitude of the sinusoidal corrugating roll is A 1 , a quantity of complete sinusoidal corrugations on the sinusoidal corrugating roll is B; then calculating a time T required for a complete corrugated rolling;
step 4: according to functional minimization of a total power in a rolling deformation zone, calculating a rolling force F at any time t during the sinusoidal corrugated rolling of the metal composite plate, which comprises specific steps of:
step 4.1: according to characteristics of the sinusoidal corrugating roll, establishing equations r 1θ , r 2θ and r 3θ for describing contact surfaces between the corrugating roll and the difficult-to-deform metal slab, between the flat roll and the easy-to-deform metal slab, and between the difficult-to-deform metal slab and the easy-to-deform metal slab, respectively;
step 4.2: according to natures of a flow function and the characteristics of the sinusoidal corrugating roll, establishing a velocity field and a strain velocity field in a composite slab corrugated rolling deformation zone;
step 4.3: obtaining a slab deformation resistance according to the rolling temperature T temp of the difficult-to-deform metal slab and the easy-to-deform metal slab, an actual material type to be rolled, and a rolling schedule;
step 4.4: according to the velocity field, the strain velocity field, and the slab deformation resistance, calculating a total power functional at any time t of slab corrugated rolling;
step 4.5: calculating a minimum value of the total power functional at any time t, and calculating the rolling force F at any time t according to a relationship between the total power functional and the rolling force; and
step 5: calculating the roll gap S of the corrugated rolling at any time t according to the rolling force F, and configuring a rolling mill to have the roll gap S according to an actual rolling schedule before normal production.

2. The method, as recited in claim 1 , wherein in the step 3, the time T required for the complete corrugated rolling is calculated as:

T
=

2
⁢

⁢
π

B
⁢

⁢
ω

.

3. The method, as recited in claim 1 , wherein the step 4.1 comprises specific steps of:
establishing a cylindrical coordinate system by defining a center O of a middle portion of the sinusoidal corrugating roll as an origin, and expressing any point in the coordinate system with coordinates (r, θ, z); wherein the contact surface between the corrugating roll and the difficult-to-deform metal slab is expressed as r 1θ :
r 1θ =R 0 +A 1 sin[ B (θ+ω t )]

the contact surface between the flat roll and the easy-to-deform metal slab is expressed as r 2θ :
r 2θ =(2 R 0 +h 1f +h 2f )cos θ−√{square root over ([(2 R 0 +h 1f +h 2f )cos θ] 2 −(2 R 0 +h 1f +h 2f ) 2 +R 0 2 )}

the contact surface between the difficult-to-deform metal slab and the easy-to-deform metal slab is expressed as r 3θ :

r

3
⁢

⁢
θ

=

2
⁢

⁢

l
⁡

(

R
0

+

h

1
⁢

⁢
f

)

2
⁢

⁢
l
⁢

⁢
cos
⁢

⁢
θ

+

(

h

2
⁢

⁢
i

-

h

1
⁢

⁢
i

)

⁢
sin
⁢

⁢
θ

+

A
2

⁢

sin
⁡

[

B
⁡

(

θ

Assignees

• Univ Taiyuan Technology

Inventors

• Liu Yuanming
• Wang Tao
• Hao Pingju
• Wang Zhenhua
• He Dongping
• Ren Zhongkai
• Han Jianchao
• Huang Qingxue

Classifications

• B21B2001/386

  Plates · CPC title

• B21B2275/04

  Roll speed · CPC title

• B21B2265/24

  asymmetric rolling · CPC title

• B21B2267/06

  Roll diameter · CPC title

• B21B2203/38

  Strain gauges · CPC title