Discussion on 2-roll Rotary-rolling Pipe Mill
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摘要: 目前斜轧管机是我国热轧无缝钢管生产的两大主力机型之一。介绍了二辊斜轧管机的特点、工艺改进及技术发展动向;探讨了导盘与导板、辗轧角、扩径轧管与减径轧管、芯棒润滑与循环等问题。同时,对“采用二辊延伸机组生产Φ60mm以下小直径热轧无缝钢管”,以改变我国小直径热轧无缝钢管目前存在的“以冷代热”的不合理产品结构的可行性进行了简要论述。Abstract: The rotary-rolling pipe mill is regarded as one of the two major pipe mill types commonly used domestically.Elaborated in the paper are the characteristics,the technological upgrade and the technical development trend of the pipe mill.Also discussed are such issues associated with the mill,including the guide disc and the guide shoe,the toe angle,the expanding process and the reducing process,and lubrication and cycling of the mandrel.At last the author presents a brief discussion on the feasibility for “ producing small-sized hot-rolled seamless steel pipes under Φ 60 mm with the 2-roll elongating mill” in a bid to improve the unreasonable domestic product mix of such pipes that is composed of “cold-rolled pipes instead of hot-rolled ones”.
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