Casting thin strip and delivery nozzle therefor
a thin strip and nozzle technology, applied in the field of thin strips, can solve the problems of defects in the thin strip and the tendency to produce thin strips that contain defects, and achieve the effect of substantially reducing the formation of the skull
Inactive Publication Date: 2013-05-16
NUCOR CORP
View PDF2 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The patent text is about a method for reducing skulls in a casting pool. Skulls are formed as the shells move towards the nip and can lead to quality issues in the casting process. The method involves using different flows through first and second passages of a reservoir portion of a metal delivery nozzle. The first passages deliver molten metal shallowly into the casting pool near the side dams, while the second passages deliver molten metal deeper into the pool near the side dams. By doing this, skulls can be significantly reduced and the quality of the castings can be improved.
Problems solved by technology
In prior art metal delivery nozzles, there has been a tendency to produce thin cast strip that contains defects from uneven solidification at the chilled casting surfaces of the rolls.
This localized heat loss near the side dams has a tendency to form skulls of solid metal in that region, which can grow to a considerable size and fall between the casting rolls and cause defects in the cast strip.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0033]Referring to FIGS. la and lb, the metal strip casting apparatus 2 includes a metal delivery nozzle 10 located below a tundish 4 and above a pair of casting rolls 6. The casting rolls 6 are laterally positioned with a nip 9 formed between them. The tundish 4 receives molten metal from a ladle (not shown) and delivers the molten metal to a delivery nozzle 10. A shroud 5 may extend from the tundish 4 and into the delivery nozzle 10, for the purpose of transferring molten metal into the delivery nozzle 10. In the alternative, the tundish 4 may transfer molten metal to the delivery nozzle 10 via a hole in the bottom of the tundish 4. Below and around the lower portions of the delivery nozzle 10, a casting pool 8 having a surface 8A is formed and supported on the casting surfaces 7 of the casting rolls 6 adjacent the nip 9. The casting pool 8 is constrained at the ends of the casting rolls 6 and side dams or plates (not shown) positioned against the ends of the casting rolls. The si...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Length | aaaaa | aaaaa |
| Length | aaaaa | aaaaa |
| Flow rate | aaaaa | aaaaa |
Login to View More
Abstract
A method of casting metal strip and equipment therefor where an elongated metal delivery nozzle extending along in a continuous caster with at least one segment having a main portion adapted to deliver molten metal in the casting pool above the nip along the metal delivery nozzle and an end portion adjacent side dams having a reservoir portion with first and second passages adapted to deliver molten metal into a molten metal pool adjacent the side dams while shells are forming on the casting rolls. The first passages are adapted to deliver molten metal shallowly into the casting pool adjacent the side dams, and the second passages adapted to deliver molten metal deeper into the casting pool than the first passages adjacent the side dams to inhibit formation of skulls during the formation of the cast strip during a casting campaign.
Description
RELATED APPLICATION[0001]This application claims priority to and the benefit of U.S. Provisional Patent Application No. 61 / 483,405, filed May 6, 2011, the disclosure of which is incorporated herein by reference.BACKGROUND AND SUMMARY OF THE INVENTION[0002]This invention relates to making thin strip and, more particularly, casting of thin strip by a twin roll caster.[0003]It is known to cast metal strip by continuous casting in a twin roll caster. Molten metal is introduced between a pair of counter-rotating horizontal casting rolls which are cooled so that metal shells solidify on the moving roll surfaces and are brought together at the nip between the casting rolls to produce a solidified strip product delivered downwardly from the nip. The term “nip” is used herein to refer to the general region at which the rolls are closest together. The molten metal may be poured from a ladle into a smaller vessel or tundish / distributor, from which it flows through a metal delivery nozzle locat...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): B22D11/06
CPCB22D11/0622B22D41/50B22D11/0642
InventorMAHAPATRA, RAMA BALLAVFUKASE, HISAHIKO
OwnerNUCOR CORP