大型直缝焊管多点弯曲一次性矫直新工艺原理  

Principle of Multi-point Bending One-off Straightening Process for Longitudinally Submerged Arc Welding Pipes

作　　者：赵军[1] 宋晓抗[1] 曹宏强[1] 刘娟[1] 

机构地区：[1]先进锻压成形技术与科学教育部重点实验室(燕山大学),秦皇岛066004

出　　处：《机械工程学报》2014年第2期92-97,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51175452)

摘　　要：由于大型直缝焊管的特殊性,多采用三点弯曲多次矫直的方法修正其直线度。基于平面弯曲弹复理论及过弯矫直等价原理,给出基于管件初始挠度曲线分布的理论矫直弯矩,施加该理论弯矩可将管件一次性完全矫直。为方便工业应用,将该弯矩离散线性化,提出多点弯曲一次性矫直控制策略,并给出相应的工艺参数的确定方法。通过实测大型管件挠度分布,建立大型管件多点弯曲一次性矫直的数值仿真模型,并以小尺寸管件的物理模拟试验验证仿真模型的可靠性。对实际管件的仿真模拟结果验证多点弯曲一次性矫直控制策略的可行性,为全自动矫直机的设计和应用提供理论基础。Due to the geometric particularity of longitudinally submerged arc welding（LSAW） pipes, the multi-step three-point bending method is mainly used to correct its straightness in manufacturing. The theoretical straightening moment, which corresponds with the pipe＇s initial deflection distribution, is calculated based on the springback equation of small curvature plane bending and the equivalent principle for over-bend straightening. The pipe can be completely straightened by applying this theoretical straightening moment. To facilitate industrial applications, the multi-point bending one-off straightening control strategy is proposed by discretizing and linearizing the theoretical moment curve. Besides, the method to determine the corresponding straightening parameters is established. After measuring the initial deflection distribution of a LSAW pipe, the finite element methods （FEM） simulation model of its multi^point straightening process is built. The reliability of this model is verified by physical simulation experiments of small size pipes. Meanwhile, the feasibility of the multi-point bending one-off straightening control strategy is verified by the simulation results. This new strategy provides a theoretical basis to the design and the application of the automatic straightening machine.

关 键 词：大型直缝焊管 多点弯曲 压力矫直 弯矩 控制策略 

分 类 号：TG306[金属学及工艺—金属压力加工]