Abstract:

Over-bending setting round for pipe end is one of the most important processes to make the large pipes standard. The study of rigidity influence in the forming process and the logical control policy are the base to formulate the proper technological parameter. Through the physical test, this paper contrasted the mould press type bending process of long pipe billet end and the mould press type bending process short pipe billet, and established the relationship between the pipe ovality and the deformation, thereby a control policy of mould press type over-bending setting round for large pipe end was built.The experimental results suggest that the control policy can control the residual ovality of pipe-end within 0.5%.

Key words: large pipe, over-bending setting round, rigidity influence, control policy

摘要：

管端过弯矫圆是规范大型管件管端椭圆度的重要工序之一，研究其变形过程的刚端影响及工艺控制策略是合理确定矫圆工艺参数的基础。首先通过实验验证了矫圆与压扁之间的等价关系以及管端压扁与短管整体压扁之间的相似关系，进而结合短管压扁过程的数值模拟给出了管端矫圆的控制策略。实验验证结果表明，该控制策略可以将残余椭圆度控制在0.5%以内。

关键词: 大型管件, 过弯矫圆, 刚端影响, 控制策略