Construction and commissioning of a network of mini-mills of various maximum production volumes requires installation of equipment. Several plants have developed mills in which continuous-reduction stands have been replaced by three-high stands. Despite prior experience in using continuous-cast billets for production of a variety of rolled shapes in modern continuous mills, use of this approach in shape mills with three-high reduction stands requires an technical feasibility assessment of the new forming modes and pass designs used for these modes. Comparative analysis indicated that the newly developed billet forming modes and pass designs did not fully achieve the requisite technical feasibility. The stress-strain behavior in the early passes facilitates not only formation of end cracks, but also increases the likelihood of discontinuity defects in the metal over the entire free surface of the billet not in contact with the bottom or corners of the pass due to development of tensile stresses. Absence of reduction in the initial box passes during rolling of continuous-cast billets therefore will lead to rhombicity defects. Using excessively high reductions in individual passes makes clamping of the process cross section less stable, increases the likelihood of overfilling the pass, and increases the peak rolling load in certain passes Collectively this suggests that these process characteristics indicate that a better-validated approach is needed for determination of continuous-cast billet rolling schedules for three-high reduction stands.

中文翻译：

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现代小型轧机三辊式轧机机架轧制设计的技术可行性评估

各种最大产量的小型工厂网络的建设和调试需要安装设备。几家工厂已经开发出用三辊机架取代连续压下机架的轧机。尽管之前在现代连轧机中使用连铸坯生产各种轧制型材方面有经验，但在具有三辊压下机座的型材轧机中使用这种方法需要对用于生产的新成型模式和道次设计进行技术可行性评估。这些模式。对比分析表明，新开发的坯料成形方式和道次设计没有完全达到必要的技术可行性。早期道次中的应力应变行为不仅有助于形成端部裂纹，但由于拉应力的产生，在不与焊道底部或拐角接触的坯料的整个自由表面上，金属中出现不连续缺陷的可能性也会增加。因此，在连铸坯轧制过程中，初始箱式道次没有压下会导致菱形缺陷。在单个道次中使用过高的压下量会使过程横截面的夹紧不太稳定，增加了道次过满的可能性，并增加了某些道次中的峰值轧制载荷 总的来说，这表明这些过程特征表明需要更好的验证方法用于确定三辊压下机座的连铸方坯轧制计划。