Abstract
Nonsinusoidal oscillation techniques can shorten the negative strip time and improve the slab surface quality in the process of steel continuous casting. But the acceleration of nonsinusoidal oscillation is higher than that of the sinusoidal oscillation. So it is easy to result in the impact for the mold movement. To solve this problem, a nonsinusoidal oscillation waveform function of mold was constructed, which had good dynamic characteristics. And the smaller acceleration can reduce the impact of the oscillator. By analyzing the parameters of oscillation technology, the calculation method of each oscillation technological parameter for seven section functions was presented and the multitechnological parameter curves were given. Based on the technological parameters of sinusoidal oscillation, a synchronous control model of nonsinusoidal oscillation was determined. The results show that the parameters can satisfy the limit value in theory, which can enhance the casting speed, surface quality of slab, and provide reference for further practice in industry.
Highlights
Mold oscillation plays an important role in continuous casting
It decides whether the continuous casting progress is smooth or not. e velocity rules of mold oscillation went through rectangular, trapezoid, sinusoidal, and nonsinusoidal oscillation
An oscillation waveform of entire function was developed by Suzuki et al [10], which had been used in many iron and steel enterprises. e principle of nonsinusoidal oscillation was studied by means of the rotation vector method, and Li et al proposed an oscillation waveform which could be realized by using a Complexity couple of elliptical gears [11], which had been applied in many companies and achieved good results
Summary
Mold oscillation plays an important role in continuous casting. It decides whether the continuous casting progress is smooth or not. e velocity rules of mold oscillation went through rectangular, trapezoid, sinusoidal, and nonsinusoidal oscillation. En, an oscillation waveform function was proposed in this paper, which has lower maximum acceleration and good dynamic characteristic. In order to obtain better dynamic characteristic of oscillation waveform, a nonsinusoidal oscillation waveform composed of seven section functions was proposed, which had lower acceleration and inertia force. Based on nonsinusoidal oscillation waveform of seven section functions, the calculation methods of technological parameters were given, the multitechnological parameter curve was obtained, and the synchronous control model of casting speed and oscillation frequency was determined. E calculation results indicate that the oscillation waveform function proposed in this paper will be useful to further improve the quality of slab and highly efficient continuous casting.
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