| 摘要 |
PURPOSE:To prevent the generation of breakout and to obtain a billet having an excellent surface characteristic in the stage of oscillating a casting mold and drawing out the billet by controlling oscillation waveform and waveform distortion factor by numerical equations. CONSTITUTION:The billet is drawn at a high speed from the lower part of the casting mold while said mold is oscillated vertically at the non-sinusoidal waveform expressed by equation I in a manner as to satisfy the conditions expressed by equations II and III. In equations I and II, t: time, f: the oscillation frequency (cycle/min) of the non-sinusoidal waveform, a: the amplitude mm. of the non-sinusoidal waveform, lambda: the waveform distortion (0<lambda<1) of the non-sinusoidal waveform, Vc: the casting speed mm./min of the billet. In equation III, tnon-sin: the time when the displacement of the non-sinusoidal waveform in one cycle is max., tsin: the time when the displacement of the sinusoidal waveform (Z= asin2pift) in one cycle is max. |
