Non-sinusoidal vibration method of continuous casting mold

Abstract

The invention relates to a continuous casting crystallizer non-sinusoidal oscillation method. In each oscillation period, an oscillation waveform is formed by a seven-segment function, the motion lawof a crystallizer drive device is controlled, so that the crystallizer achieves the non-sinusoidal oscillation shown by the seven-segment function; if 0<=t<=tB, the crystallizer moves upwards at constant speed, and the speed is a constant; if tB<=t<=tC, the crystallizer upwards does the variable deceleration motion, the speed curve is a parabola, the motion is conducted to the time of tC, and thespeed becomes 0; if tC<=t<=tD, the crystallizer downwards moves at constant acceleration, and the speed curve is a skew line; if tD<=t<=tF, the crystallizer moves downwards at variable acceleration and then downwards moves at variable deceleration, and the speed curve is a parabola; if tF<=t<=tG, the crystallizer downwards moves at constant deceleration, the time of tG is reached, the speed becomes 0, and the speed curve within the time period is a straight line; if tG<=t<=tH, the crystallizer moves upwards at variable acceleration, and the speed curve is a skew line; and if tH<=t<=tK, the crystallizer moves upwards at constant speed, the speed is a constant, and a section of horizontal line is achieved.

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 crystallizer. Background technique [0002] Non-sinusoidal vibration of continuous casting mold can obtain ideal process parameters. It can obtain a small negative sliding time, which is beneficial to reduce the vibration mark depth of the slab; at the same time, a large positive sliding time can be obtained, which will help the consumption of mold flux and improve the lubrication between the slab and the mold wall ; A small positive sliding speed difference can be obtained, reducing the upward friction of the mold wall on the slab and the tensile stress in the solidified slab shell; a large negative sliding lead can be obtained, which is beneficial to the demoulding of the slab. Therefore, non-sinusoidal vibration has achieved good technological effects in reducing cracking, leaking and surface depth of slabs, a...

AI Technical Summary

Problems solved by technology

The two-segment function non-sinusoidal vibration waveform given by the patent CN105081241A has a continuous acceleration curve, but there are sharp points, and in a short period of time, the acceleration changes greatly, which makes the inertial force of the mechanism change greatly, which is not conducive to the stability of the device run

The four-segment function non-sinusoidal vibration waveform constructed by the patent CN105945249A, although its acceleration is smooth and continuous, but under the same process parameters, the maximum value of the acceleration is relatively large, which is likely to cause shock and noise to the equipment, and the parameter calculation cannot give an analytical solution , has a certain impact on the application and regulation of the field

In 2007, China Mechanical Engineering Vol. 18, No. 15 reported that the non-sinusoidal vibration waveform constructed by the five-segment function, although the acceleration curve is continuous, but there are sharp points at the connection points of the function, which is not conducive to the long-term stable operation of the mechanism.

Patent CN103752783A provides a non-sinusoidal vibration waveform constructed by a seven-segment function, the purpose of which is to control the maximum acceleration of the waveform without being affected by the slope of the waveform within a certain range. This method involves many parameters, poor control ability, and the selection of parameter k The value has a certain range limit, the function structure is complex, and the implementation method has certain limitations

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