Φ100mm三輥連軋管機組荒管“劃傷”缺陷分析及對策

Investigation of Defective Scratch of Shell as Rolled with Φ100 mm 3-roll Mandrel Mill

摘要: 針對Φ100mm三輥連軋管機組荒管外表面容易出現(xiàn)金屬“劃傷”缺陷的問題,在分析成因的基礎上,通過重新分配穿孔與連軋工藝的變形量,優(yōu)化連軋管機孔型,針對不同規(guī)格毛管設定各機架速度制度,更換磨損嚴重的機架下楔塊等措施,有效地減少了“劃傷”缺陷的產(chǎn)生。

Abstract: Addressing the problem that scratch defects as made by metallic operation tool often occur on the outer surface of the shell as rolled with the Φ100 mm 3-roll mandrel mill,the causes are investigated,and then identified.Accordingly,a number of measures are taken,including re-distributing the deformation amounts of the workpiece in both the piercing process and the mandrel mill-rolling process,optimizing the passes of the mandrel mill,determining the rolling speed schedule of each stand of the mandrel mill as per the size variation of the shells,and replacing worn-out wedges beneath the roll-stand and so on.As a result,the occurrence frequency of the above mentioned tube scratch defect is obviously reduced.