Waveform adjustable non-sinusoidal vibration method of continuous casting crystallizer

Abstract

The invention discloses a waveform adjustable non-sinusoidal vibration method of a continuous casting crystallizer, which belongs to the technical field of continuous casting. The method is characterized in that a drive device for controlling the continuous casting crystallizer drives the continuous casting crystallizer, in every vibration period, to conduct non-sinusoidal vibration according to a track determined by the following vibration displacement procedure function: a formula (1) is as described in the specification, wherein S(t) is the displacement of the non-sinusoidal vibration; h is the stroke of the non-sinusoidal vibration; omega is angular velocity of the non-sinusoidal vibration, t is time of the non-sinusoidal vibration, ai is a technology constant correlated to the sinusoidal vibration and is not correlated to the stroke h and the angular velocity omega; and i is a term number. According to the method, when the track determined by the vibration displacement procedure function in a quadrinomial can ensure that the waveform does not distort when the rate of deflection is 0-37.5%; and the velocity, accelerated velocity and accelerated velocity change of the non-sinusoidal vibration of the crystallizer are all monotonous and continuous, so that the impact on equipment due to flutter in the course of operating is avoided, and the operation of the equipment is more stable and reliable.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and specifically refers to a non-sinusoidal vibration method of a continuous casting crystallizer with adjustable waveform. 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 slab. During the production process, due to the rapid heat exchange and cooling process between the molten steel and the wall in the mold, the primary billet shell is formed and closely adhered to the wall of the mold. In order to avoid sticking and achieve smooth demoulding, a time-varying crystallizer vibration curve was developed and gradually developed into a standard sinusoidal vibration law curve. However, in the process of continuous vibration, there must be relative motion between the mold and the billet shell, which will cause friction to the billet shell, and form vi...

AI Technical Summary

Problems solved by technology

In the above existing methods, the acceleration change of the combined function model is discontinuous in the transition zone, and the resulting sudden change has an adverse effect on the stability of vibration; when the compound function model has a small skew rate (about 20%), the acceleration change will appear Discontinuity, manifested as speed fluctuations, which will have an impact on the equipment and cause flutter; the trigonometric series function model proposed by CISDI does solve the monotonous and continuous problems in the range of the change process to a certain extent, and The selection range of the skew rate has been improved, but due to the limitations of the selection of coefficients and series, there are also certain requirements for the skew rate. As it is introduced, the skew rate corresponding to the heptomial is only maintained at about 30%. To a certain extent, it limits the use of the superiority of non-sinusoidal vibration

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