Abstract
For the deficiencies of traditional stress detection methods for steel strips in industrial production, this paper proposes a non-contact stress detection scheme based on the magnetoelastic effect. The theoretical model of the transmission-type stress detection is established, in which the output voltage and the tested stress obey a linear relation. Then, a stress detection device is built for the experiment, and Q235 steel under uniaxial tension is tested as an example. The result shows that the output voltage rises linearly with the increase of the tensile stress, consistent with the theoretical prediction. To ensure the accuracy of the stress detection method in actual application, the temperature compensation, magnetic shielding and some other key technologies are investigated to reduce the interference of the external factors, such as environment temperature and surrounding magnetic field. The present research develops the theoretical and experimental foundations for the magnetic stress detection system, which can be used for online non-contact monitoring of strip flatness-related stress (tension distribution or longitudinal residual stress) in the steel strip rolling process, the quality evaluation of strip flatness after rolling, the life and safety assessment of metal construction and other industrial production links.
Highlights
As a main product in the iron and steel industry, cold rolling steels have been an important material in all aspects of the national economy
This paper presents further systematic investigations on the theoretical model and the compensation for the measurement errors caused by the external environment factors
Mathematical Model of Transmissive Stress Detection Based on the Magnetoelastic Effect
Summary
As a main product in the iron and steel industry, cold rolling steels have been an important material in all aspects of the national economy. A crucial factor to improve the shape quality of the cold rolling steel strips is to detect the stress distribution accurately [4]. A popular form is the contact pressure-based detection device involving several separation rollers, by building the relation between the tension in the steel strip and the pressure on the rollers. Yamada et al [11], Sablik et al [12] and Liu et al [13] proposed the magnetic anisotropy-based stress detection method using the quadripolar sensor. Our group has done some experiments on the magnetoelastic effect-based stress detection method, in which the locations and parameters of the sensors and the distance between the steel strip and sensors are studied [14,15]. The influences of some external factors on the detection accuracy of the device will be investigated, and the correction schemes will be proposed correspondingly
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