Title

MOULD OSCILLATION MONITORING IN CONTINUOUS CASTING

MOULD OSCILLATION MONITORING IN CONTINUOUS CASTING

Authorship

Ciriza, Javier; Toledo, Gonzalo Alvarez de; Laraudogoitia, Juan José; Carboni, Marcelo Carboneri; Bolota, José Roberto

Ciriza, Javier

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Toledo, Gonzalo Alvarez de

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Laraudogoitia, Juan José

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Carboni, Marcelo Carboneri

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Bolota, José Roberto

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DOI

10.5151/2594-5300-0023

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Abstract

Abnormal performance of critical operational elements of the continuous casting machine (CCM) can produce surface defects on continuous casting (CC) products or even break-outs. Moreover, surface and sub-surface defects in the CC semis are not usually along all the semis length, but only in some places, highlighting the existence of transitory phenomena. Those facts have shown the importance of reaching stable CC operation conditions and the need of knowing when transient conditions are happening during casting. To achieve that involves several things: to identify relevant CC parameters, to monitor them, to identify abnormal transient values and to relate transient values to semis quality. Both, off-line and on-line, mould monitoring techniques have been employed by SIDENOR I+D including mounted sensors (accelerometers, linear voltage displacement transducers (LVDT), strain gauges) and instrumented moulds. This paper pays special attention to the assessment of the friction between billet and mould and its application for breakout forecasting using advanced on-line monitoring techniques. An index for billet-mould friction assessment has been defined using strain gauges installed in the cam rod of the oscillation mechanism. Through the study of the information related to casting parameters prior to fifty-eight breakouts it was concluded that almost 50% of them could have been forecast through the behaviour of the monitored parameters prior to the breakouts. A monitoring program called SIROL has been developed to judge on-line the CCM performance. Another index for billet-mould friction assessment, using accelerometers placed in the oscillating mould cassette, has been recently obtained; and in this paper the preliminary results are presented. It can be said that the mould monitoring is a useful tool to improve the system operation and product quality as well as to optimise the predictive maintenance work.

Abnormal performance of critical operational elements of the continuous casting machine (CCM) can produce surface defects on continuous casting (CC) products or even break-outs. Moreover, surface and sub-surface defects in the CC semis are not usually along all the semis length, but only in some places, highlighting the existence of transitory phenomena. Those facts have shown the importance of reaching stable CC operation conditions and the need of knowing when transient conditions are happening during casting. To achieve that involves several things: to identify relevant CC parameters, to monitor them, to identify abnormal transient values and to relate transient values to semis quality. Both, off-line and on-line, mould monitoring techniques have been employed by SIDENOR I+D including mounted sensors (accelerometers, linear voltage displacement transducers (LVDT), strain gauges) and instrumented moulds. This paper pays special attention to the assessment of the friction between billet and mould and its application for breakout forecasting using advanced on-line monitoring techniques. An index for billet-mould friction assessment has been defined using strain gauges installed in the cam rod of the oscillation mechanism. Through the study of the information related to casting parameters prior to fifty-eight breakouts it was concluded that almost 50% of them could have been forecast through the behaviour of the monitored parameters prior to the breakouts. A monitoring program called SIROL has been developed to judge on-line the CCM performance. Another index for billet-mould friction assessment, using accelerometers placed in the oscillating mould cassette, has been recently obtained; and in this paper the preliminary results are presented. It can be said that the mould monitoring is a useful tool to improve the system operation and product quality as well as to optimise the predictive maintenance work.

Keywords

Continuous casting, Billet, Monitoring, Breakout

Continuous casting, Billet, Monitoring, Breakout