Method for determining non-sinusoidal vibration technological parameters of crystallizer

Abstract

The invention relates to a method for determining non-sinusoidal vibration technological parameters of a crystallizer. The method includes the steps that five parameters, expressed by an integral function, of a non-sinusoidal wave are the vibration frequency C1 at the pulling speed of zero, the vibration frequency / pulling speed coefficient C2, the amplitude C3 at the pulling speed of zero, the amplitude / pulling speed coefficient C4 and the non-sinusoidal factor alpha; through the five parameters, a vibration frequency and a vibration amplitude value A can be obtained according to a formula; according to the relation between displacement, speed and acceleration and the vibration amplitude value A and the vibration frequency, parameter values of the displacement, the speed and the acceleration can be obtained, and accordingly parameter information such as negative sliding time and a negative sliding rate can be worked out. The method has the advantages that a non-sinusoidal vibration device is made to achieve sinusoidal / non-sinusoidal online switching of the amplitude, and the requirements for different working conditions such as vibration modes, amplitudes, pulling speed and steel types of different casting machines are met; the quality of billet steel is effectively improved, the service life of copper pipes of the crystallizer is prolonged, the production cost is reduced, and the method has high application and popularization value.

Description

technical field [0001] The invention relates to the technical field of continuous casting vibration, in particular to a method for determining non-sinusoidal vibration process parameters of a crystallizer. Background technique [0002] As the core of continuous casting production, the continuous casting process in the mold plays a vital role in the smooth flow of production and the quality of the slab; in the production process, due to the rapid heat exchange and cooling process between the molten steel and the wall in the , form the primary shell and fit closely on the wall of the crystallizer; in order to avoid sticking and achieve smooth demoulding, the crystallizer vibration curve that changes with time is developed, and gradually develops into a standard sinusoidal vibration law curve; but In the process of continuous vibration, there must be relative motion between the mold and the billet shell, which will cause friction on the billet shell, and form vibration marks an...

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Problems solved by technology

[0004] In order to achieve high frequency, small amplitude, and produce a certain amount of negative slip, the non-sinusoidal vibration method used in continuous casting machines generally adopts segmented functions. This method is simple to operate and relatively easy to control; due to the large vibration mass of the mold , The vibration frequency is high, so when constructing the non-sinusoidal vibration waveform function, in addition to making it have all the characteristics of the best vibration model to meet the requirements of the non-sinusoidal vibration device’s technological action, it must also have good dynamic characteristics; good The dynamic characteristics of the vibration device are conducive to improving the stability of the vibration device; it can be seen from the mechanism that if the velocity curve is discontinuous, it will cause rigid shock; It does not produce rigid impact and does not produce flexible impact; the non-sinusoidal waveform represented by the piecewise function, the velocity curve is continuous, so there will be no rigid impact; the acceleration curve is also continuous, so there will be no flexible impact, and the field operation Good sex, such as figure 1 shown; but from its acceleration function expression and curve, it can be seen that the rate of change of the acceleration of the non-sine wave represented by the piecewise function is at point A and point B, figure 1 It has been marked that it is discontinuous and has a sudden change, so the change of the inertial force of the vibrating mass has a sudden change, which also has an adverse effect on the stability of the vibration; the non-sinusoidal waveform represented by the overall function, the speed curve of the non-sinusoidal wave of the overall function is continuous, It will not cause rigid shock; the acceleration of the non-sinusoidal wave of the overall function is continuous, so there is no flexible shock, and the rate of change of its acceleration is also continuous, so its dynamic characteristics are better than the non-sinusoidal wave represented by the piecewise function, but The method of determining the process parameters of the overall function has not been reported in the literature, which limits the industrial application of the non-sinusoidal vibration overall function to a certain extent.

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