3027 Investigation of waveform construction and dynamic characteristics for mold non-sinusoidal oscillation
DOI:
https://doi.org/10.17159/Abstract
Compared with sinusoidal oscillation, non-sinusoidal oscillation enhances the ability of controlling waveform and meets different oscillation requirement by adding independent parameter, which is the key technology for high-efficiency continuous casting. A new waveform of mold non-sinusoidal oscillation is proposed in this paper, and its velocity waveform is only composed of straight lines and parabolas, which not only has good dynamic characteristics, but also further enhances the feature of non-sinusoidal oscillation. Compared with sinusoidal oscillation, the negative strip time is reduced by 15.9%, the maximum negative strip velocity difference is increased by 38.3%, and the maximum positive strip velocity difference is decreased by 27.8%. The formulas of oscillation process parameters can be clearly deduced, and the isoplethic curves of oscillation process parameters when multi-parameter simultaneously change are drawn. The negative strip time decreases as the modification ratio, frequency and casting speed increase, but increases as stroke increases. In order to maintain the stability of negative strip time, an oscillation synchronous control model for optimizing oscillation basic parameters was developed. Through practical application, the mean oscillation mark depths decreased by 10.1 μm and the flux consumption is increased from 0.37 kg/t to 0.45 kg/t in non-sinusoidal oscillation model, which meets the requirements of normal production.
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