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首页> 外文期刊>Ironmaking & Steelmaking >Dynamic pressure in mould flux channel during mould non-sinusoidal oscillation
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Dynamic pressure in mould flux channel during mould non-sinusoidal oscillation

机译：结晶器非正弦振动过程中结晶器通量通道中的动压力

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摘要

Based on the lubrication theory of mould flux, a mathematical model of dynamic pressure in mould flux channel was developed, and the distribution of dynamic pressure and its variation during non-sinusoidal oscillation were investigated. The effects of casting speed and nonsinusoidal oscillation parameters, including the degree of non-sinusoidal operation (nonsinusoidal factor), amplitude and frequency of oscillation on the dynamic pressure in the mould flux channel, were studied. The results indicate that the maximum negative pressure is decreased, and the maximum positive pressure is increased with increasing non-sinusoidal factor. The optimum value of non-sinusoidal factor is ～0.2. With increasing amplitude and frequency of oscillation, both the negative and positive pressure are increased; moreover, the increment of positive pressure is obviously greater than that of negative pressure; especially when the oscillation frequency is increased, the increment of negative pressure is very little. When the casting speed is enhanced, the negative pressure is increased, but the positive pressure is decreased. Therefore, if the casting speed is increased, the oscillation amplitude needs to be increased, as well as the oscillation frequency needs to be decreased properly. With these adjustments, the positive pressure in mould flux channel is nearly unchanged. The actions of strand demoulding and cracks welding are kept effective. Moreover, the negative pressure in mould flux channel is increased properly, which causes the flux consumption to increase, so the mould lubrication is improved. Finally, the strand surface quality is improved greatly, and breakout can be avoided. The applicability of the optimised non-sinusoidal oscillation parameters for the two kinds of casting speed has been proven by industrial practice.
机译：基于结晶器通量的润滑理论，建立了结晶器通量通道内动压的数学模型，研究了动压的分布及其在非正弦振动过程中的变化。研究了铸造速度和非正弦振动参数，包括非正弦操作程度（非正弦因子），振动幅度和频率对结晶器通量通道中动压的影响。结果表明，随着非正弦系数的增加，最大负压减小，最大正压增大。非正弦因子的最佳值为〜0.2。随着振荡幅度和频率的增加，负压和正压都增加。而且，正压的增量明显大于负压的增量。特别是当增加振荡频率时，负压的增量很小。当提高铸造速度时，负压增加，而正压降低。因此，如果增加铸造速度，则需要增加振荡幅度，并且需要适当降低振荡频率。通过这些调整，模具通量通道中的正压几乎不变。钢绞线脱模和裂纹焊接的作用保持有效。而且，模具助焊剂通道中的负压适当增加，这导致助焊剂消耗增加，因此改善了模具润滑。最终，大大改善了钢绞线的表面质量，并且可以避免断裂。最佳的非正弦振动参数对于两种铸造速度的适用性已通过工业实践证明。

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