Method to obtain a continuous casting apparatus and continuous casting apparatus thus obtained

Patent metadata

Field	Value
Publication number	US-11865607-B2
Application number	US-201917413329-A
Country	US
Kind code	B2
Filing date	Nov 28, 2019
Priority date	Dec 12, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

Method to obtain a continuous casting apparatus to cast, through the casting cavity of a crystallizer of a mold, a cast product with a polygonal cross section.

First claim

The invention claimed is:

1. A method to obtain a continuous casting apparatus to cast, through a casting cavity ( 13 ) of a crystallizer ( 14 ) of a mold ( 11 ), a cast product (P) with a polygonal cross section (Si, S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ), wherein said method provides to determine a minimum containing length (LC) of a containing device ( 21 ) with rollers, located downstream of said mold ( 11 ) and configured to contain a deformation of said cast product (P) with the containing device ( 21 ) with rollers, said minimum containing length (LC) being determined, on each occasion, as a function at least of a width (W) of a side of the polygon, of a maximum admissible deformation camber (f) of said side of the polygon outside the mold ( 11 ), and of a casting speed (Vc).

2. The method as in claim 1 , wherein said crystallizer ( 12 ) has a crystallizer length (LM), wherein said mold ( 11 ) comprises a plurality of guide rollers ( 25 ) disposed at an exit end of the crystallizer ( 12 ) and that extend for a guide length (LG) along a casting line (Z), and wherein said containing length (LC) is:
equal to zero if L<LM+LG
equal to L−(LM+LG) if L>LM+LG
where:
LM: is the length of the crystallizer ( 12 );
LG: is the guide length covered by the guide rollers ( 25 );
L is determined so as to satisfy the following equation:

L

1
,
5

-

ρ
·
g
·
Rm
·

W
3

·

Vc

1
,
5

·

sin
⁡
(

L
/
Rm

)

32
·
E
·
f
·

K
3

=
0

where:
ρ: is the density of a cast material
g: is the gravitational acceleration
E: is the Young modulus
K: is a solidification constant
W: is the width of the side of the polygonal cast product
Vc: is the casting speed
Rm: is a radius of curvature of the casting line Z
f: is the maximum admissible deformation camber of the side, expressed as a percentage of the width W of the side of the polygon.

3. The method as in claim 2 , wherein when,

LC
>

[

π
·
Rm

2

-

(

LM
+

L
⁢
G

)

]

,

the value of LC calculated
and assigned to be

LC
=

[

π
·
Rm

2

-

(

LM
+

L
⁢
G

)

]

.

.

4. The method as in claim 2 , wherein said maximum admissible deformation camber (f) is comprised between 0.2% and 5% of the width W of the side of the polygon.

5. The method as in claim 2 , wherein said maximum admissible deformation camber (f) is comprised between 0.2% and 3% of the width W of the side of the polygon.

6. The method as in claim 2 , wherein said maximum admissible deformation camber (f) is comprised between 0.3% and 1.5% of the width W of the side of the polygon.

7. The method as in claim 1 , wherein said casting speed (Vc) is greater than 6 m/min.

8. The method as in claim 1 , wherein the number of sides of said cross section (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ) is an even number.

9. The method as in claim 8 , wherein said cross section (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ) is shaped as a regular or irregular polygon.

10. The method as in claim 1 , wherein said casting cavity ( 13 ) has an octagonal cross section shape.

11. The method as in claim 1 , wherein said casting speed (Vc) is greater than 6.5 m/min.

12. The method as in claim 1 , wherein the number of sides of said cross section (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ) is a multiple of four.

13. The method as in claim 1 , wherein the number of sides of said cross section (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , S 7 ) is four.

Assignees

• Danieli Off Mecc
• Danieli Off Mecc

Inventors

• Salvador Nikolas
• Entesano Luca
• De Luca Andrea

Classifications

• B22D11/009 Primary

  of work of special cross-section, e.g. I-beams, U-profiles · CPC title

• B22D11/0408 Primary

  Moulds for casting thin slabs · CPC title

• B22D11/207

  responsive to thickness of solidified shell · CPC title

• B22D11/1206

  for plastic shaping of strands (rolling mills B21B1/46) · CPC title

• B22D11/055

  Cooling the moulds {(B22D11/04 takes precedence)} · CPC title