J55鋼級(jí)Ф107.95 mm×15 mm無(wú)縫鋼管穿孔內(nèi)折缺陷試驗(yàn)分析

Test Analysis of Shell Inner Fold Defect Occurring in Piercing Process for Manufacturing Ф107.95 mm×15 mm J55 Seamless Steel Tube

摘要: 分析了導(dǎo)致J55鋼級(jí)Ф107.95 mm×15 mm無(wú)縫鋼管斜軋穿孔內(nèi)折缺陷產(chǎn)生的原因,通過(guò)選取不同組合的壓下量、頂頭直徑、頂桿位置、導(dǎo)板間距等軋制參數(shù)進(jìn)行試驗(yàn),以減小壓下量、縮短頂桿位置、增大頂頭直徑、縮小導(dǎo)板間距等措施,實(shí)現(xiàn)了頂前壓下率、壓縮次數(shù)和孔型橢圓度系數(shù)的優(yōu)化組合,消除了生產(chǎn)J55鋼級(jí)Ф107.95 mm×15 mm無(wú)縫鋼管時(shí)的穿孔內(nèi)折缺陷。

Abstract: Analyzed in the paper are the causes for the occurrence of the shell inner fold defect during the rotary piercing process for manufacturing the Ф107.95 mm×15 mm J55 seamless steel tube. Tests are conducted with different rolling data sets as selected and composed of screwdown amount,plug diameter,plug bar position,and distance between the guide shoes,etc. Based on the test results,relevant actions are taken,including reduching the screwdown amount,getting the plug bar position closer than before,increasing the plug diameter and cutting down distance between the guide shoes. As a result,an optimum data set consisting pre-piercing screwdown rate,compression frequency and the groove ovality factor is obtained,which has resulted in elimination of the pierced shell inner defect of the said J55 tube.