Non-sinusoidal vibration method of continuous casting mold

Abstract

The invention relates to a non-sinusoidal vibration method for a continuous casting mold. In each vibration period, the vibration waveform is composed of eight-segment functions. Vibration waveform; at 0≤t≤t B , the crystallizer moves upward at a constant speed, and the speed is a constant; at t B ≤t≤t C Inside, the crystallizer moves upward with variable deceleration, the speed curve is a cubic curve, and it moves to t C At time, the velocity becomes 0; at t C ≤t≤t D Inside, the crystallizer moves downward with uniform acceleration, and the speed is an oblique line; at t D ≤t≤t E , the crystallizer first changes and accelerates downward, and at t E ≤t≤t F Inside, the variable deceleration moves downward, and the speed curves are all cubic curves; at t F ≤t≤t G , the crystallizer moves downward with uniform deceleration, reaching t G At the moment, the speed becomes 0, and the speed curve is a straight line during this time period; at t G ≤t≤t H , the crystallizer moves upward with acceleration, and the speed curve is a cubic curve; at t H ≤t≤t K Inside, the crystallizer moves upward at a constant speed, which is a 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 mold. Background technique [0002] The vibration waveform of continuous casting mold has experienced rectangular wave, trapezoidal wave, sine wave and now non-sinusoidal wave. In the past, sinusoidal vibration was only adjusted by changing the two parameters of amplitude and frequency, so the adjustment range was limited, which was not conducive to the further improvement of the quality of the slab. Therefore, the non-sinusoidal vibration of the mold is one of the key technologies to achieve high-efficiency continuous casting, which is of great significance for improving the billet drawing speed and the quality of the billet. [0003] At present, the non-sinusoidal vibration waveform functions mainly include integral functions and piecewise functions. Although the displacement, velocity and acceleration curves ...

AI Technical Summary

Problems solved by technology

The two-segment function non-sinusoidal vibration waveform given by the patent CN105081241A has a complex structure of the waveform function, and it is difficult to give an analytical expression, so it is not easy to control

The non-sinusoidal vibration waveform of the three-segment function given in the patent CN 109766514 A, although simple in structure, also exists, and the vibration process parameters are not easy to solve, so it is not conducive to online adjustment

The four-segment function non-sinusoidal vibration waveform constructed by the patent CN105945249A, although its acceleration is smooth and continuous, it cannot give an analytical solution, and it is not convenient to adjust the vibration process parameters on-line

Patent CN103752783A provides a non-sinusoidal vibration waveform constructed by a seven-segment function. Although the maximum acceleration of the waveform is reduced, the waveform function is complex in structure, involves many parameters, and has poor control ability

Patent CN 109807297 A provides a non-sinusoidal vibration waveform constructed by a seven-segment function. Although the form is simple, it is difficult to obtain a large negative sliding time and a small positive sliding speed difference during high-frequency vibration

Patent 106311995A provides a non-sinusoidal vibration waveform constructed by an eight-segment function. The structure is complex and there are many parameters. There is no analytical solution. Therefore, the waveform is not easy to adjust online

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