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确定轴承钢在连铸坯凝固末端的位置,对于轴承钢轻压下工艺的合理制定、改善铸坯的中心疏松及中心偏析等缺陷具有至关重要的意义。首先,采用二维非稳态传热方程,结合本钢350mm×470mm矩形坯铸机自身特点,建立了矩形坯凝固模型。其次,通过射钉试验,取片做硫印,来标定生产状态下不同位置的坯壳厚度。最后,对铸坯的表面温度进行了实际测定。研究结果表明,射钉硫印测量的坯壳厚度、实测的铸坯表面温度都与凝固模型的计算结果相近,实际生产过程中,完全可以采用该模型来理论计算铸坯凝固末端,为轻压下工艺提供理论依据。
Determining the position of the bearing steel at the end of solidification of the billet is of crucial significance for the reasonable formulation of the process of the light reduction of the bearing steel and the improvement of the looseness of the center of the billet and the center segregation. First of all, a two-dimensional unsteady heat transfer equation was used to establish a rectangular billet solidification model based on the characteristics of the 350mm × 470mm rectangular billet caster. Second, through the nailing test, take the film to make sulfur seal, to calibrate the production of different positions of the thickness of the blank shell. Finally, the actual measurement of slab surface temperature was carried out. The results show that the thickness of the blank shell measured by the sulfur nailing and the measured surface temperature of the slab are similar to those of the solidification model. In the actual production process, the model can be used to theoretically calculate the solidification end of the slab, Under the process to provide a theoretical basis.