Method and device for regulating a continuous casting machine

Patent metadata

Field	Value
Publication number	US-11110512-B2
Application number	US-201716466313-A
Country	US
Kind code	B2
Filing date	Dec 6, 2017
Priority date	Dec 13, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A method and a device for regulating a continuous casting system. The continuous casting system has a mold (1) and a strand guide (8) which is arranged downstream of the mold (1). Molten metal (3) is cast into the mold (1), in particular via an inlet device (4). The molten metal hardens on walls (1a) of the mold (1), such that a metal strand (7) with a hardened strand shell (5) and a still liquid core (6) is formed. The metal strand (7) is drawn out of the mold (1) by mutually spaced rollers (8b) of the strand guide (8), and a measurement variable is ascertained which correlates to the undulation of the casting level formed in the mold. The measurement variable is processed using at least one computing specification and is used to reduce the undulation of the casting level. In order to reduce the undulations of the casting level, the mutual spacing of opposing rollers (8b) of the strand guide is changed cyclically prior to the full hardening point (D).

First claim

The invention claimed is:

1. A method for regulating a continuous casting machine, wherein the continuous casting machine comprises a mold for forming a strand and a strand guide for guiding the strand and metal from the mold downstream of the mold;
the method comprising:
pouring liquid metal into the mold, via an inflow unit, wherein the liquid metal solidifies on walls of the mold, thereby forming a metal strand having a solidified strand shell and a still liquid core forming within the shell;
drawing the metal strand out of the mold by means of rollers of the strand guide, wherein the rollers are arranged spaced apart;
determining a measured variable correlated with cyclical variations of a casting level of liquid metal in the mold;
processing the measured variable with incorporation of at least one computing rule and using the at least one computing rule to reduce the cyclical variations of the casting level of the liquid metal in the mold; and
reducing the cyclical variations of the casting level of the liquid metal in the mold by cyclically changing the mutual spacing of opposing rollers of the strand guide toward or away from the strand before a complete solidification point, whereby the cyclical variations of the casting level of the liquid metal in the mold are opposed by anti-cyclically changing the mutual spacing of opposing rollers of the strand guide toward or away from the strand.

2. The method as claimed in claim 1 , wherein the cyclic changes are in a frequency range up to greater than or equal to 0.6 Hz.

3. The method as claimed in claim 1 , further comprising: arranging multiple roller segments, each having one or more rollers, on both sides along the strand guide, and adjusting at least one roller segment normally in relation to a strand guide direction.

4. The method as claimed in claim 3 , further comprising adjusting at least one roller segment of a first segment.

5. The method as claimed in claim 3 , further comprising pivoting at least one roller segment.

6. The method as claimed in claim 3 , further comprising adjusting at least one roller segment in parallel alignment in relation to an opposing roller segment.

7. The method as claimed in claim 1 , further comprising adjusting at least one roller segment by an adjustment device, which comprises at least one electromechanical or hydraulic actuator.

8. The method as claimed in claim 1 , further comprising detecting frequencies of the cyclic variations of the casting level in a frequency range from 0.6 to 5 Hz; and
offsetting the cyclic variations by cyclic opposing change of the roller spacing of rollers of the strand guide.

9. The method as claimed in claim 1 , further comprising detecting frequencies of first cyclic variations of the casting level in a first frequency range;
offsetting the first cyclic variations by cyclic opposing movements of the inflow unit;
detecting further frequencies of second cyclic variations of the casting level in a second frequency range; and
offsetting the second cyclic variations by cyclic opposing change of the roller spacing of rollers of the strand guide, wherein the second frequency range is greater than the first frequency range.

10. A device for carrying out a method as claimed in claim 1 , comprising:
means for introducing a metal melt into a mold, a strand guide comprising rollers;
a measuring unit for measuring the cyclic variations of the casting level; and
an adjustment device connected to a control unit, the adjustment device is configured to reduce and compensate the cyclic variations of the casting level in the mold by anti-cyclic change of the roller spacing of opposing rollers of the strand guide toward or away from the strand for opposing the variations of the casting level.

11. The device as claimed in claim 10 , wherein the adjustment device is configured for cyclic changes of the roller spacing in a frequency range up to greater than or equal to 0.6 Hz.

12. The device as claimed in claim 10 , wherein the adjustment device comprises at least one hydraulic or electromechanical actuator.

13. The device as claimed in claim 10 , wherein the rollers comprise multiple roller segments, each segment having one or more rollers, the roller segments are arranged on both sides along the strand guide, wherein at least one roller segment is adjustable in a direction normal in relation to a strand guide direction by means of the adjustment device.

14. The device as claimed in claim 13 , wherein the at least one roller segment is a first roller segment.

15. The device as claimed in claim 13 , wherein the at least one roller segment is pivotable.

16. The device as claimed in claim 13 , wherein the at least one roller segment is adjustable in parallel alignment in relation to an opposing roller segment arranged along the strand guide.

17. The device as claimed in claim 10 , wherein the measuring unit is configured and operable to detect frequencies of the cyclic variations of the casting level in a first frequency range;
an inflow unit of the mold is configured and operable to offset cyclic opposing movements of an inflow unit of the mold;
the measuring unit being configured and operable to detect further frequencies of the cyclic variations of the casting level in a second frequency range;
the cyclic variations of the first and second frequency ranges are offsettable by a cyclic opposing change of roller spacing of the rollers of the strand guide and by the adjustment device; and
wherein the second frequency range is greater than the first frequency range.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Dollhäubl Paul Felix
• Watzinger Josef
• Wieser Philipp

Classifications

• B22D11/20 Primary

  for removing cast stock · CPC title

• B22D11/201

  responsive to molten metal level or slag level · CPC title

• B22D11/18 Primary

  for pouring (B22D11/20 takes precedence) · CPC title

• B22D11/128 Primary

  for removing · CPC title

• B22D11/181

  responsive to molten metal level or slag level · CPC title