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结晶器振动导致初凝坯壳受力和变形是产生铸坯表面裂纹的主要原因。通过计算2.0 m/min拉速时弯月面区最大液体摩擦力和最大渣道动态压力,分析了高拉速下结晶器振动参数变化对板坯表面纵裂纹和横裂纹形成的影响,并结合振动参数对结晶器润滑和振动状态的影响,阐明减少表面裂纹的振动参数控制措施。研究结果表明:提高振频和振幅均增大铸坯表面裂纹形成的可能,振频影响强于振幅;增大非正弦振动因子降低了坯壳撕裂可能性,且对润滑有利,但使振痕加深,振动冲击加剧;适当降低振频,增大振幅和非正弦振动因子可抑制表面裂纹形成。
The main cause of slab surface cracking is the stress and deformation of the initial solidified shell caused by mold oscillation. By calculating the maximum liquid friction and the maximum dynamic pressure in the meniscus at the speed of 2.0 m / min, the influence of the mold vibration parameters on the longitudinal and transverse crack formation on the slab surface was analyzed. The influence of vibration parameters on the lubrication and vibration of the mold is clarified, and the control measures to reduce the vibration parameters of the surface cracks are clarified. The results show that both increasing vibration frequency and amplitude can increase the formation of surface cracks in slab, and the influence of vibration frequency is stronger than that of amplitude. Increasing non-sinusoidal vibration factor can reduce the possibility of tearing, and it is good for lubrication, Darker marks, vibration and shock intensified; appropriate reduction of vibration frequency, increase the amplitude and non-sinusoidal vibration factor can inhibit the formation of surface cracks.