Metal founding – With signal – indicator or inspection means – Including thermal sensor
Patent
1998-02-02
1999-05-18
Ryan, Patrick
Metal founding
With signal, indicator or inspection means
Including thermal sensor
1644503, 1641514, 1641541, B22D11/16
Patent
active
059042028
DESCRIPTION:
BRIEF SUMMARY
During continuous casting, it is possible, during the growth of the strand shell in the mold, for locations to occur in the strand shell at which the said strand shell solidifies only inadequately or not at all. As soon as the strand leaves the mold, these growth faults lead to a break in the strand, through which molten steel escapes. The damage which this causes to the casting installation necessitates a relatively long shutdown of the installation and gives rise to high repair costs. Efforts are therefore made to detect growth faults in the shell before it emerges from the mold. If this is successful, the exit speed is reduced to such an extent that the potential break-out location can solidify.
Possible break-out locations are determined from the surface temperature curves measured by temperature sensors fitted in the mold in the region of the inner wall of the mold. The arrangement of the temperature sensors in a manner distributed around the strand in one or more planes offset in the direction of the strand is known. If a fault in the strand shell moves past the temperature sensors, the measured temperature rises due to the non-formation of a strand shell or the formation of a strand shell which is only weak, behind which there is molten steel, the temperature curves recorded in the case of the threat of a break-out having a characteristic shape.
To be able to predict possible breakouts from the temperature curves recorded, U.S. Pat. No. 4,949,777 describes a comparison of the change of the temperature detected by each individual temperature sensor to an average value formed from the changes in temperature detected using of all the temperature sensors and the monitoring of the results of comparison thus obtained for the exceeding of a predetermined threshold value. If the temporal and positional distribution of the threshold-value overshoots corresponds to a predetermined pattern, this is an indication of an imminent break-out.
For early detection of break-outs in the context of pattern recognition with neural networks, T. Tanaka et al.: Trouble Forecasting System by Multi-Neural Network on Continuous Casting Process of Steel Production" in T. Kohonen et al. (Ed.): Artificial Neural Networks; Proc. of the 1991 Int. Conf. on Artificial Neural Networks, Espoo, Finland, Elsevier Science Publishers B.V. (North Holland), 1991, pp. 835 to 840, describes the practice of storing the temperature curves recorded by the individual temperature sensors and analyzing them for characteristic patterns.
In a method described in Japanese Patent Application No. 4172160, the temperatures detected using the temperature sensors are fed to a neural network which generates an output signal when the three-dimensional temperature distribution exhibits a pattern characteristic of an imminent break-out.
Prediction of break-outs using neural networks which is to any extent reliable requires the presence of sufficient training data for the neural network. There is, however, the problem that training data from one installation cannot be transferred without modification to another installation. In addition, there is the fact that the decision criteria by which the prediction of break-outs takes place are essentially concealed from the operator of the installation.
Moreover, conventional methods for pattern recognition require complete temperature patterns, e.g. temperature curves, resulting in high outlay on storage. At the same time, the computational outlay is very high since each change in the temperature pattern, thus, for example, when the temperature curve has a new temperature value added to it and the oldest temperature value is simultaneously erased, requires a completely new pattern recognition operation.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a device for the early detection of break-outs which, with only a low computational outlay, guarantees reliable detection of possible break-outs in a manner which can be followed by the operator of the installation.
The early detection of break-
REFERENCES:
patent: 5548520 (1996-08-01), Nakamura
patent: 5714866 (1998-02-01), Set et al.
patent: 5751910 (1998-05-01), Bryant
Lin I.-H.
Ryan Patrick
Siemens Aktiengesellschaft
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