Method for the continuous casting of a metal strand in a continuous casting installation and a continuous casting installation

Patent metadata

Field	Value
Publication number	US-9802244-B2
Application number	US-201314376015-A
Country	US
Kind code	B2
Filing date	Jan 31, 2013
Priority date	Feb 1, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A method for the continuous casting of a metal strand in a continuous casting installation, in which, in a casting machine, the metal formed into a slab, with a still molten core, is brought out vertically from a mold, wherein, downstream of the mold in the conveying direction, the slab is made to move along a casting bow, through a number of casting bow segments, and is deflected into the horizontal, wherein each casting bow segment has a number of segment rollers, which are designed for coming into contact with the surface of the slab. In the region before the end of the casting machine, a number of segment rollers are lifted off from the surface of the slab, or are not installed in receptacles provided, and so the contact between the slab and the segment roller is interrupted or there is no contact.

First claim

The invention claimed is:

1. A method for continuous casting of a metal strand in a continuous casting installation, comprising the steps of: bringing a metal, which has been formed into a slab with a still-molten core in a casting machine, vertically out of a mold; guiding the slab downstream of a mold in a conveying direction through a number of segments and deflecting the slab into a horizontal plane, wherein each segment comprises a number of rollers on each side of the slab, which rollers are configured to make contact with a surface of the slab; raising a number of the rollers from the surface of the slab on the side of the slab that faces upward when the slab is in the horizontal plane or not installing the rollers in mountings provided in an area upstream of an end of the casting machine, so that contact between the slab and the raised rollers is interrupted or is not present; and introducing a thermal insulating element between the surface of the slab and a surface of the raised or not installed rollers, which roller surface is closest to the slab surface.

2. The method according to claim 1 , wherein, downstream of the mold in the conveying direction, the slab is guided along a curved apron through a number of curved apron segments and deflected into a horizontal plane, wherein each curved apron segment comprises a number of segment rollers, which are configured to make contact with the surface of the slab, wherein, along the curved apron in the area upstream of the end of the casting machine, a number of segment rollers are raised from the surface of the slab or not installed in the mountings provided.

3. The method according to claim 2 , further including carrying out a numerical simulation pursuant to a mathematical model, wherein a location of a tip of the molten core is determined at least based on casting speed and slab geometry, wherein raising of the segment rollers is carried out on the basis of the numerical simulation so that the raising is carried out for a defined section along the segments.

4. The method according to claim 3 , wherein the raising is carried out along the curved apron.

5. The method according to claim 1 , wherein introduction of the insulating element is accomplished by inserting the insulating element horizontally from a side of the slab.

6. The method according to claim 1 , wherein the thermal insulating element is permanently installed between support rollers or drive rollers, which are spaced a certain distance apart in front of one or both sides or edges of the slab.

7. The method according to claim 1 , further including providing the segments with coolant to cool the slab, wherein cooling action is reduced or decreased to zero at least in a number of segments.

8. The method according to claim 1 , wherein the slab is supported by support rollers at least in an area of the segments with raised segment rollers.

9. The method according to claim 1 , wherein the raised segment rollers and/or support rollers exposed to radiant heat of the slab are driven in rotation.

10. The method according to claim 1 , including arranging a furnace downstream from the casting machine, and arranging at least one thermal insulating element for thermally insulating the slab in an area between the end of the casting machine and the furnace entrance.

11. The method according to claim 10 , wherein the at least one thermal insulating element is moved only temporarily into the area of the slab to thermally insulate the slab.

12. The method according to claim 11 , wherein the at least one thermal insulating element is moved into an area of a shears and/or into an area of an in-line stand and/or into an area of a cold strand removal unit.

13. A continuous casting installation for continuous casting of a metal strand, comprising: a casting machine, in which a metal which has been formed into a slab with a still molten core is brought vertically out of a mold; a number of segments arranged downstream from the mold in a conveying direction to deflect the slab into a horizontal plane, wherein each segment comprises a number of rollers on each side of the slab, which rollers are configured to make contact with a surface of the slab, wherein in an area upstream of an end of the casting machine, a number of the rollers are provided with positioning means to allow the rollers to be raised from the surface of the slab on the side of the slab that faces upward when the slab is in the horizontal plane; and, at least one movable thermal insulating element placeable in a passive position outside the segment and in an active position inside the segment and between the slab surface and a surface, which is closest to the slab surface, of the raised rollers.

14. The continuous casting installation according to claim 13 , wherein, downstream from the mold in the conveying direction, a curved apron with a number of apron segments is arranged, by which the slab is deflected into a horizontal plane, wherein a number of the segment rollers extending along the curved apron in the area upstream of the end of the casting machine are provided with the positioning means to allow the segment rollers to be raised from the surface of the slab.

15. The continuous casting installation according to claim 13 , wherein the at least one movable thermal insulating element is adjustably arranged so as to be positionable horizontally and transversely to the conveying direction of the slab.

Assignees

• Sms Siemag Ag
• Sms Group Gmbh

Inventors

• Seidel Jürgen

Classifications

• B22D11/1287

  Rolls; Lubricating, cooling or heating rolls while in use · CPC title

• B22D11/1281

  Vertical removing · CPC title

• B22D11/1206 Primary

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

• B22D11/141

  for vertical casting · CPC title

• B22D11/208

  for aligning the guide rolls · CPC title