Abstract: The effect of reduction of diameter, reduction of wall thickness, feed angle, tube diameter/wall thickness (d/t) and rotating speed of roll on diameter expanding amount (Δd), degree of non -homogeneous wall thickness (Δt) and axial slide factor (ηo) for rolling steel 20Cr tube is studied during Assel mill rolling process. The roll shape for rolling Φ70 mm x 3 mm 20Cr steel tube is designed. Commercial production results show that with Φ76.3-76.6 mm x 7.89-8.36 mm shell, Assel mill rolling parameters- throat diameter 58 mm, mandrel diameter 52 mm, feed angle 15°, rotating speed 200 r/min the rolled Φ70 mm x 3 mm 20Cr steel tube meets the requirement of standard.

Key words: Assel Mill, Alloy Structural Steel, Φ70 mm x3 mm Steel Tube, Rolling Parameters, Design of Optimum Roll Shape

摘要： 现场实验研究了Assel轧机轧制过程减径量、减壁量、牌坊转角、钢管径壁比(d/t)和转速对20Cr钢管扩径量(Δd)、壁厚不均匀度(Δt)和轴向滑移系数(ηo)的影响。设计了轧制Φ70 mm×3 mm 20Cr钢管的辊型。工业生产结果表明,毛管尺寸为Φ76.3～76.7 mm×7.89～8.36 mm，Assel轧机轧制参数为喉径58 mm,芯棒52mm.转角15°,转速200 r/min时可轧出符合标准要求的Φ70 mm×3 mm的20Cr钢管。

关键词: Assel轧管机, 合金结构钢, Φ70 mmx3mm钢管, 轧制参数, 辊型优化设计