Non-sinusoidal oscillation method for continuous casting crystallizer

Abstract

The invention provides a non-sinusoidal oscillation method for a continuous casting crystallizer. The non-sinusoidal oscillation method concretely comprises the following steps: controlling a drive device of the continuous casting crystallizer to make the continuous casting crystallizer, driven by the drive device, carry out non-sinusoidal oscillation according to a four-stage speed waveform determined by the following four-stage function within each oscillation period: wherein in each oscillation period, the oscillation process is divided into the following four stages: at the first stage, the continuous casting crystallizer moves upwards at a constant upward oscillation speed; at the second stage, the continuous casting crystallizer carries out decelerated motion upwards firstly and then carries out accelerated motion downwards when the upward oscillation speed is slowed down to 0 until the downward accelerated motion speed reaches T/2; at the third stage, the continuous casting crystallizer carries out decelerated motion downwards firstly and then carries out accelerated motion upwards when the downward oscillation speed is slowed down to 0 until the upward accelerated motion speed reaches t3; and at the fourth stage, the continuous casting crystallizer moves upwards at a constant upward oscillation speed. According to the non-sinusoidal oscillation method, a non-sinusoidal oscillation waveform is constructed by a four-stage function method, the form is simple, and in addition, speed, displacement and acceleration curves in each oscillation period are all smooth without an inflection point.

Description

technical field [0001] The invention belongs to the technical field of metallurgical continuous casting, and in particular relates to a non-sinusoidal vibration method of a continuous casting crystallizer. Background technique [0002] The continuous casting mold is the most critical part in the continuous casting machine, and its performance plays a very important role in the production capacity and quality of the continuous casting slab. Therefore, the continuous casting mold is also called the "heart" of the continuous casting machine. In the production process, the quality of the continuous casting slab is directly related to its changing behavior inside the continuous casting mold. Continuous casting mold vibration, as one of the important control methods, is of great significance for reducing slab defects and improving slab quality. With the development of continuous casting mold vibration technology, its vibration mode is also constantly evolving. The vibration vel...

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Problems solved by technology

[0005] The segmental function method mainly includes two-segment, five-segment and seven-segment segmental function representations, patent CN105081241 [1] The disclosed non-sinusoidal vibration method of the continuous casting crystallizer adopts the two-stage function method to construct the angular velocity equation of the eccentric shaft swing operation, so that the continuous casting crystallizer is driven by the driving device to perform non-sinusoidal vibration in each vibration cycle according to the waveform determined by the angular velocity equation. Sinusoidal vibration, although the acceleration curve is continuous during the vibration process, there are still inflection points at individual moments, which is not conducive to maintaining the stability of the vibration mechanism under high-frequency vibration

Another way to report [2,3] The five-segment function method is used to construct the non-sinusoidal vibration velocity waveform. The velocity curve is smooth. Although the acceleration curve is continuous, there are still inflection points in the acceleration curve at the connection points of different curve segments, which is also not conducive to the stable and long-term operation of the vibration mechanism.

Patent CN103752783 [4] It is disclosed that the seven-segment function method is used to construct the non-sinusoidal vibration velocity waveform. The purpose is to keep the maximum acceleration under different slope rates unchanged, but the acceleration waveform has six inflection points in one vibration cycle, which affects the stability of the vibration mechanism. Larger, and this method uses many functions, and the construction form is complicated, which is not desirable in practical applications

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