Strip casting apparatus with improved side dam force control
a strip casting and side dam technology, applied in the field of thin strip casting, can solve the problems of reducing casting yield and casting egg in the cast thin strip, and achieve the effect of reducing casting yield and improving casting yield
Inactive Publication Date: 2014-09-18
NUCOR CORP
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- Description
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AI Technical Summary
Benefits of technology
The patent text discusses a problem in the casting of thin strip by twin roll casting. As the casting campaign progresses, the side dams wear and move towards the center of the casting pool, causing a step down and forming intermittent gaps between the side dams and the casting rolls. This can result in the formation of snake eggs in the cast thin strip, reducing the casting yield. The technical effect of the patent is to improve the casting yield by addressing this problem.
Problems solved by technology
This can cause intermittent gaps to form between the side dams and the casting rolls where skulls can form resulting in snake eggs in the cast thin strip.
That in turn reduces the casting yield.
Method used
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Embodiment Construction
[0015]Referring to FIGS. 1 and 2, a twin roll caster system for continuously casting thin steel strip is comprised of a main machine frame 10 that stands up from the factory floor and supports a roll cassette module 11 with a pair of counter-rotatable casting rolls 12 mounted thereon. The casting rolls 12 have shaft portions 22 (FIG. 3) and casting surfaces 12A laterally positioned to form a nip 18 there between. The casting rolls 12 are mounted on the roll cassette 11 for ease of operation and movement of the casting rolls. The roll cassette facilitates rapid movement of the casting rolls 12 ready for casting from a setup position into an operative casting position in the caster as a unit, and ready removal of the casting rolls 12 from the casting position when the casting rolls are to be replaced. There is no particular configuration of the roll cassette that is desired, so long as it performs that function of facilitating movement and positioning of the casting rolls.
[0016]Molten...
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Abstract
A method of casting a thin strip is disclosed. The method includes assembling a pair of side dams adjacent end portions of counter-rotating casting rolls through which a strip of metal can be cast to permit a casting pool of molten metal to be formed supported by the casting surfaces of the casting rolls, assembling an angular actuator connected to a side dam at an angle urging the side dam toward the casting pool with a hold down force component urging the side dam downwardly, assembling a metal delivery system above the casting rolls delivering molten metal to form a casting pool supported on the casting surfaces of the casting rolls above the nip and confined by the pair of side dams, and counter-rotating the casting rolls such that the casting surfaces of the casting rolls each travel inwardly to produce a cast strip downwardly from the nip.
Description
BACKGROUND AND SUMMARY[0001]This invention relates to making thin strip and more particularly casting of thin strip by a twin roll caster.[0002]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 rolls to produce solidified strip product delivered downwardly from the nip between the rolls. 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, from which it flows through a transition piece to a metal delivery nozzle positioned above the nip, longitudinally between the casting rolls, which delivers the molten metal to the region above the nip to form a casting pool of molten metal. The casting pool of molten metal is supported o...
Claims
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IPC IPC(8): B22D11/06
CPCB22D11/0622B22D11/066B22D11/0665
Inventor MCQUILLIS, GARYFULBRIGHT, ERICAUSTIN, WAYNE
Owner NUCOR CORP