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利用上界三角形速度场推导了热轧条件下厚板中心气孔缺陷压合时内部缺陷开裂的判定条件。证明了动态临界几何条件当l/h≥0.518时坯料为压合轧制;当给定轧件入口厚度时,增加道次压下率ε、轧辊半径R、单位宽度轧制力P,将有利于厚板缺陷压合;升温和咬入时加后推力也有利于缺陷压合。此外,还提供实例首次对厚板压下规程的压合条件进行了分析计算,算例表明:特厚板轧制设计道次压下率时,应尽量使道次变形区不存在拉应力区、满足压合条件并避免表面变形,方能使中心区域有效压合,起到提高探伤合格率及改善内部质量的明显效果。本文提出了制定厚板轧制规程需考虑缺陷压合条件的新思路。
The upper triangular boundary velocity field is used to deduce the condition of cracking of internal defects during lap pressing at the center of slab under hot rolling conditions. It is proved that the dynamic critical geometry condition is that the blank is pressed and rolled when l / h≥0.518, and the pass reduction rate ε, the roll radius R and the rolling force per unit width P are given when the thickness of the entrance is given. Which is good for the lamination of the thick plate defects; when the temperature is increased and the bite is added, the post-thrust force is also beneficial to the defect lamination. In addition, an example is provided for the first time to analyze and calculate the lamination condition of the plank. The calculation example shows that when designing the pass reduction of the plank plate rolling, the tensile stress zone , To meet the conditions of lamination and to avoid surface deformation, in order to effectively press the central area, to improve the pass rate of inspection and improve the quality of the internal obvious effect. In this paper, a new way of thinking about the condition of lap pressing is put forward in order to make the rolling plan of slab.