Transactions of Materials and Heat Treatment

Title：Influence of cage roll-forming bottom line parameters on forming quality for large-diameter welded pipes

Authors： Hu Shengde Ma Wenchao Yang Jun Wang Long Zhou Zhifeng Liao Hanqing

Unit： Wuhan University of Science and Technology

KeyWords： pre-forming cage roll-forming bottom line longitudinal strain of edge equivalent plastic strain

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2016,41(5):61-66

Abstract：

The quality of welded pipes is affected by the shape of cage roll-forming bottom line. The FEM model for cage roll-forming was established according to the roll position parameters for welded pipe Φ508 mm, and by fitting the positions data of bottom rollers, the forming process on cage roll mills was simulated by adopting dynamic explicit algorithm. The simulation results show that the non-uniformed deformation is found at longitudinal strain of edge during the pre-forming stage of the cage roll-forming bottom line, and the roll position parameters will be optimized. On the above basis, the cage roll-forming bottom line can be adjusted from upper to down. Furthermore, the optimized roll position was obtained by lowering the bottom line twice, and influential regulations of cage roll-forming bottom line on longitudinal strain and equivalent plastic strain of edge were also obtained. During pre-forming stage, the longitudinal strain appears at crimping roller and large pressure roller of the strip edge. With the roll position moving down, the longitudinal strain at strip edge becomes more uniform by optimizing the positions of bottom rollers, but the equivalent plastic strain becomes bigger.

Funds：

钢铁冶金及资源利用省部共建教育部重点实验室开放基金项目(FMRU200903)

胡盛德(1972-),男,博士,教授马文超（1989-),男,硕士研究生

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