摘要
介绍了优化微张力定(减)径机厚壁孔型提高钢管尺寸精度的生产实践。针对Φ159 mm、Φ177 mm连轧管机组微张力定(减)径机孔型在轧制10 mm及以上壁厚钢管时,钢管会出现壁厚超差及严重"内六方"现象,将孔型优化为负宽展孔型。测量负宽展孔型轧制后厚壁产品的外径和壁厚,以验证优化效果。采用优化后的负宽展孔型进行轮制,厚壁钢管的外径和壁厚精度均提高,钢管外径不圆及壁厚“内六方”倾向减轻。
Described in the article are the activities for optimization of the slight-stretch sizing(reducing)mill in a bidto improving the steel tube dimensional accuracy.Addressing the problem that when rolling heavy-wall pipes with wallthickness over l0 mm by using the passes of the slight-stretch sizing(reducing)mill of the Φ159 mm and Φ177 mmmandrel pipe millines,out-of-tolerance wall thickness and serious"hexagonal bore"occur with the pipe,the pass isoptimized as a negatively-broadsided one.And the OD and WT of the pipe as rolled with the said optimized pass aremeasured to verify the optimization effectiveness.The verification result shows that owing to the optimized pass,both theOD and WT accuracies of the heavy-wall steel pipe are improved,and the trend of the OD out-of roundness and"hexagonal bore"are alleviated.
作者
郭海明
李琳琳
秦桂伟
杨永海
洪汛
GUO Haiming;LI Linlin;QIN Guiwei;YANG Yonghai;HONG Xun(Angang Seamless Steel Tube Plant,Anshan 114021,China)
出处
《钢管》
CAS
2020年第5期46-51,共6页
Steel Pipe
关键词
钢管
微张力定(减)径
厚壁
孔型
负宽展
尺寸精度
内六方
steel pipe
slight-stretch sizing(reducing)
heavy wall
pass
negatively-broadsided
dimensional accuracy
hexagonal bore
