连铸结晶器非正弦振动函数及工艺参数研究

 结晶器非正弦振动在有效避免黏结性漏钢的同时，可以获得较短的负滑动时间，有助于提高铸坯表面质量。非正弦振动的加速度比正弦振动大，容易产生冲击，降低结晶器运动的平稳性。针对此问题，构造了一种新型非正弦振动波形函数，其加速度可以根据实际情况给定，以保证良好的波形动力学特性。此波形函数可以在恒定的加速度下，通过增加波形偏斜率来减小负滑动时间，在增强非正弦振动特征的同时，不影响结晶器振动平稳性；另外，在恒定的波形偏斜率下，可以通过减小振动加速度来减小负滑动时间，在增强振动平稳性的同时，提高铸坯表面质量。通过对振动工艺参数的分析，给出了各工艺参数的计算方法，绘制了多工艺参数等值曲线，为拉速-频率同步控制模型的确定提供了参考。

Investigation of Non-Sinusoidal Oscillation Waveform Function and Technological Parameters for Continuous Casting Mold

At the time of preventing the steel leaking, the non-sinusoidal Oscillation techniques can shorten the negative strip time and enhance the slab surface quality during steel continuous casting. But Non-sinusoidal vibration’s acceleration is higher than sine vibration, and it is easy to impact thus reduce the mold movement stability. To solve this problem, a new type of waveform function of the mold non-sinusoidal oscillation is constructed, in which the acceleration can be adjusted to the realistic situation to ensure the dynamic characteristics of the waveform function. For this waveform function, in the case of constant acceleration, the enlargement of the waveform deviation factor results in the shortness of negative strip time. The character of non-sinusoidal oscillation can be enlarged without affecting the movement smoothness of mold. Moreover, in the case of the constant waveform deviation factor, the shorter negative strip time makes the acceleration smaller. So at the time of enlarging the mold movement smoothness, the slab surface quality can be enhanced. By analyzing the parameters of oscillation technology, the calculation method of each oscillation technological parameter is presented, the multi-technological-parameter curves are given and provides reference for establishing the control model of casting speed and oscillation frequency.