J55钢级Ф107.95mm×15mm无缝钢管穿孔内折缺陷试验分析

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

分析了导致J55钢级Ф107.95mm×15mm无缝钢管斜轧穿孔内折缺陷产生的原因,通过选取不同组合的压下量、顶头直径、顶杆位置、导板间距等轧制参数进行试验,以减小压下量、缩短顶杆位置、增大顶头直径、缩小导板间距等措施,实现了顶前压下率、压缩次数和孔型椭圆度系数的优化组合,消除了生产J55钢级Ф107.95mm×15mm无缝钢管时的穿孔内折缺陷。

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 prepiercing 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.