The paper presents the results of numerical simulation and experimental studies of the process of helical rolling of billets having a small-diameter bottom. An improved technology for producing small-diameter billets without the need for subsequent machining of the inner surface is proposed. Pilot-scale piercing and calibration of the billets was performed using an automated helical rolling line.

中文翻译：

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小直径底空心坯热螺旋轧制过程的数值研究

本文介绍了小直径钢坯螺旋轧制过程的数值模拟和实验研究结果。提出了一种无需对内表面进行后续机加工即可生产小直径坯料的改进技术。使用自动螺旋轧制线对钢坯进行中试穿孔和校准。