半浮動芯棒連軋荒管壁厚不均的原因分析

Investigation of Causes Responsible for Wall Thickness Tolerance of Shell as Hot-rolled with Semi-floating Mandrel Mill

摘要: 介紹了半浮動芯棒連軋管機荒管壁厚不均的類型及特點,荒管壁厚不均有同批壁厚不均、縱向壁厚不均和橫向壁厚不均等3種類型。分析了荒管壁厚不均產生的原因,穿孔毛管壁厚不均、連軋管機孔型形狀變化、軋制中心線偏移均會造成荒管橫向壁厚不均;芯棒尺寸波動會引起荒管縱向壁厚不均和同批壁厚差。提出了改善半浮動芯棒連軋荒管壁厚不均的有效措施。

Abstract: As for wall thickness unevenness of the shell produced with the semi-floating mandrel mill,there could be such different types as batch wall thickness unevenness,shall longitudinal wall thickness unevenness and transversal wall thickness unevenness.The causes for shell wall thickness unevenness are identified.Transversal wall thickness unevenness is due to the original wall thickness unevenness of the pierced hollow bloom,some change of the mandrel mill roll groove and deviation of the rolling centerline,while longitudinal wall thickness unevenness and batch wall thickness unevenness are due to geometric inconsistency of the mandrel.Countermeasures are proposed,accordingly.