Detection of roller damage and/or misalignment in continuous casting of metals
AssigneeCorus UK Limited
InventorPhilip Neill Hewitt
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Abstract
A method for detecting roller irregularities during on-line continuous casting of a metal comprises; i) continuously monitoring the changes in the mould level overtime; ii) identifying large periodic influences affecting the mould level versus time function and their frequency, iii) comparing the frequency of the periodic influences of step ii) with predicted frequency harmonics based on a normal operation of the casting process and highlighting by comparison of the predicted and actual frequencies characteristics indicative of irregularities in roller behaviour.
Claims8
A method for detecting roller irregularities during on-line continuous casting of a metal comprising;
- i) continuously monitoring the changes in the mould level over time;
- ii) identifying large periodic influences affecting the mould level versus time function and their frequency,
- iii) comparing the frequency of the periodic influences of step ii) with predicted frequency harmonics based on a normal operation of the casting process and highlighting by comparison of the predicted and actual frequencies characteristics indicative of irregularities in roller behaviour.
A method as claimed in any preceding claim wherein predicted frequency harmonics of step iii) are calculated from the equation:
- 3 fd = Vc π d
- where:
- ƒd is the frequency of the harmonic in Hz
- νc is the casting speed in m/s
- d is the roll diameter in metres
A method as claimed in any preceding claim wherein predicted frequency harmonics of step iii) are calculated from the equation:
- 4 fp = Vc p
- where
- ƒp is the frequency of the harmonic in Hz
- νc is the casting speed in m/s
- p is the roller pitch in metres
A method as claimed in any preceding claim further comprising monitoring the casting speed and alerting the system user to significant variations in the casting speed.
A method as claimed in any preceding claim further comprising;
- modelling the cast metal strand to determine the final point of solidification and discounting any periodic influences arising from segments in the casting machine which are beyond the final point of solidification.
Dependencies are inferred from the claim text.