An eddy-current-based sensor for preventing knots in metallic wire drawing processes

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2011-04Suggested citation
Esteban Dalmau, Bernat;
Riba Ruiz, Jordi-Roger;
Baquero Armans, Grau;
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(2011)
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An eddy-current-based sensor for preventing knots in metallic wire drawing processes.
Nondestructive Testing and Evaluation, 2011, vol. 26, núm. 2, p. 169-180.
https://doi.org/10.1080/10589759.2010.545128.
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During metallic wire drawing processes, the presence of knots and the failure to detect them can lead to long production interruptions, significant economic losses and a lower quality of final product. Consequently, there is a pressing need to develop methods for real-time detection and prevention of this fault.
In this paper a sensor to prevent the formation of knots during the metallic wire drawing process is presented and evaluated by means of experimental data. This fast, inexpensive, non-contact sensor is based on electromagnetic principles such as eddy current induction, magnetic reluctance variations and magnetic
coupling. The proposed sensor can detect knots in a target metallic wire without direct contact by measuring the impedance variations of a calibrated sensing coil caused either by a knot or an unwound loop rising from a wire rod. The incorporation of this type of sensor into a wire drawing machine can avoid the tightening of the knot, thereby reducing downtime and increasing the security and reliability of the process.
Experiments were conducted using a scale model of the above proposed system. This allowed to highlight the sensor’s potential by carrying out an automatic, real-time knot detection during steel wire drawing.
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Nondestructive Testing and Evaluation, 2011, vol. 26, núm. 2, p. 169-180European research projects
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