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Study on Measuring Method and Characteristics of Friction Behavior in Continuous Casting Mould

Author: MaYong
Tutor: YaoMan
School: Dalian University of Technology
Course: Materials Processing Engineering
Keywords: Continuous casting Mold friction Detection methods Hydraulic vibration Frequency domain characteristics
CLC: TF777
Type: PhD thesis
Year: 2009
Downloads: 237
Quote: 0
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Abstract


Mold friction (MDF, mould friction) is an important parameter to reflect the the solidified shell mold lubrication condition, not only has an important influence on the slab surface quality and continuous casting production anterograde and evaluation Fluxes lubricating effect, leakage The steel forecasts and slab quality monitoring has a huge potential. Mold oscillation has an important role in the continuous casting production, hydraulic vibration been developed in recent years, and gradually promote the use of mold oscillation drive. With the hydraulic vibration technology development, in-depth study of the friction between the mold and shell hydraulic vibration detection methods and their friction characteristics, increase casting speed, to ensure the quality of slab and prevent breakout accidents, important theoretical and practical significance. This paper aims to study the mold and shell surface friction behavior detection method and friction characteristics. To this end, a slab continuous casting mold hydraulic vibration device for the study, the development of the two detection methods: pressure detect transient MDF law and to detect the the average MDF friction exercises, to carry out system testing of mold friction behavior study, and MDF the time domain and frequency domain characteristics and its influencing factors analysis. The test is to establish a corresponding computing model to achieve the detection of the MDF by the displacement, pressure and other parameters of the hydraulic vibration apparatus for detecting crystallization. While taking advantage of the vibration displacement and pressure signals, the detection and evaluation of mold oscillation state. First of all, through the detection and calculation of the relevant parameters of the mold hydraulic vibration system hydraulic cylinder displacement, pressure, vibration state, testing and evaluation methods to explore the state of the mold oscillation. Deviations of displacement and phase difference with the vibration frequency, amplitude, and skew angles law of vibration parameters change, the synchronization of the output force of the hydraulic cylinder, and the dynamic characteristics of the discussion. The results show that the hydraulic mold oscillator device has a high vibration accuracy, provides a research base for the accurate detection and calculation of MDF. Secondly, based on the vibration characteristics of the hydraulic vibration device, the stress state of the mold oscillation analysis, mold oscillation force model to establish a theoretical foundation and the general idea of ??the pressure measurement of transient friction. Based on the above work, scene detection casting machine in the condition of the actual casting process, the friction between the mold and shell, to discuss the changing patterns and characteristics of the transient friction, and the different modes of vibration control model and normal abnormal pouring conditions of friction test results were compared and analyzed, which provide an experimental basis for the transient characteristics of the continuous casting mold friction behavior. Again, based on the mold oscillation behavior analysis and sinusoidal vibration characteristics, the establishment of a theoretical characterization of mold within the overall friction behavior - friction power law model, and by means of artificial neural network predictive vibration device equivalent damping establish detection and calculation mold the thinking of the average friction behavior. Friction power law friction detection data, analyze test results under discussion vibration synchronous modes of vibration and different working conditions, the analysis and discussion of the average characteristics of the friction. Finally, according to the transient friction data obtained by the pressure method, using the Fourier analysis method, the use of spectral analysis of the friction time-domain signal transformed to the frequency domain, the power spectrum of the transient friction, by analyzing the friction signal in the frequency domain the fundamental and harmonic frequencies as well as the status of their amplitude, frequency domain characteristics of mold friction in continuous casting process, the initial vibrational state and dynamic characteristics of hydraulic vibration device using Fourier analysis methods. The results show that the frequency domain characteristics of friction sensitive reflect changes in process parameters, to reflect the condition of lubrication between the mold and shell, and provides a new approach to the development and application of the technology for the crystallizer online monitoring.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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