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根据塑性理论中的塑性流理论,提出了由变形体表面变形分布情况计算表面上应力分布的方法。对高轧件在轧制变形时的表面应力分布进行了计算。计算结果表明,在高轧件侧表面的中间部分受有拉应力,但其数值并不超过金属的流动限。在轧件上下表面靠近角部的部分受有两向拉应力,其数值最大可达1.15σ_s。据此提出为改善钢坯表面质量减少缺陷,应着重研究改善铸锭质量,同时应力求缩短钢锭由出炉到初轧机之间的传送时间,以避免钢坯角部的新生裂纹。
According to the theory of plastic flow in plastic theory, a method of calculating the stress distribution on the surface by the deformation distribution of the deformed body is proposed. The surface stress distribution of high rolling stock during rolling deformation was calculated. The calculation results show that there is tensile stress in the middle part of the high-rolling side surface, but its value does not exceed the flow limit of the metal. In the upper and lower parts of the rolling surface near the corner by two-way tensile stress, the maximum value of up to 1.15σ_s. It is proposed that in order to improve the surface quality of slab to reduce defects, we should focus on improving the quality of ingot, meanwhile, we should try to shorten the transfer time from ingot to the initial rolling mill so as to avoid the fresh crack in the corner of slab.