Non-sinusoidal vibration method for continuous casting crystallizer

Abstract

The invention relates to a non-sinusoidal vibration method for a continuous casting crystallizer, which comprises the following steps that in each vibration period, avibration waveform is composed ofsix sections of functions,the crystallizer realizes non-sinusoidal vibration represented by six sections of functions by controlling the motion law of a crystallizer driving device; in 0< / =t< / =tB, the crystallizer moves upwards at a constant speed, and the speed is a constant; when t is larger than or equal to tB and smaller than or equal to tC, the crystallizer upwards makes variable and decelerated motion, the speed curve is a parabola, and the speed becomes 0 when the crystallizer moves to tC; when tC< / =t< / =tD, the crystallizer moves downwards in a variable acceleration manner, and the speed is a cubic curve; when tD< / =t< / =tE, the crystallizer moves downwards in a decelerating manner, the speed curve is a cubic curve, and the speed becomes 0 when tE is reached; when tE< / =t< / =tF, the crystallizer moves upwards in a variable acceleration manner, and the speed curve is a parabola; and when tF< / =t< / =tG, the crystallizer moves upwards at a constant speed, and the speed is a constant and is a section of horizontal line.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a non-sinusoidal vibration method of a continuous casting crystallizer. Background technique [0002] Mold vibration is an indispensable process operation in the continuous casting process. Currently, the commonly used vibration forms are mainly sinusoidal and non-sinusoidal waveforms. The high-frequency and small-amplitude operation of sinusoidal vibration can reduce the depth of vibration marks on the surface of the slab by shortening the negative sliding time, thereby improving the quality of the slab. The consumption of mold slag, that is, the lubrication effect of the slab and the wall of the mold is poor, and the friction is large. Non-sinusoidal vibration can obtain good process parameters, reduce the negative sliding time and obtain a longer positive sliding time, which increases the consumption of mold powder. In addition, a small positive sliding speed differ...

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Problems solved by technology

The two-segment function non-sinusoidal vibration waveform given by the patent CN105081241A has complex waveform parameters to solve, cannot give analytical expressions, and there are difficulties in process application

The three-segment waveform function constructed by CN1799727A has continuous displacement and velocity curves and sudden changes in acceleration curves, which can easily cause impact on equipment and affect its service life

CN105945249A provides a non-sinusoidal vibration waveform constructed by a four-segment function. Although the displacement, velocity and acceleration curves are smooth and continuous, the process parameters of the waveform are not easy to solve, and specific expressions cannot be given, so it is not easy to control

In 2000, the Journal of Mechanical Engineering, Vol. 36, No. 1 reported that the non-sinusoidal vibration waveform constructed by the five-segment function was used. Although the parameters gave specific expressions for the parameters, the difference in the positive sliding velocity of the waveform was relatively large. The tensile stress of the shell is relatively large, and breakouts are easy to occur

In 2013, China Mechanical Engineering Vol. 24 No. 24 reported that the non-sinusoidal vibration waveform constructed by the seven-segment function aims to keep the maximum acceleration unchanged under the condition of changing the segregation rate of the waveform, and the vibration impact on the mechanism is small, but In the process of function construction, there are many parameters, and the solution is complicated. It is not easy to give specific expressions of parameters, so it is not easy to adjust

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