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以AP1000主管道热段为研究对象,根据大直径厚壁管冷弯成形特点,提出可采用预制偏心管坯的方法对冷弯成形管件壁厚进行有效控制。通过分析偏心管坯的偏心量与管件成形后弯曲段壁厚间的关系,得到了偏心量的选取范围,并给出了确定偏心量下限的理论计算公式。采用1∶10的偏心管坯进行冷压弯曲实验,结果表明,偏心管坯可以实现对管件弯曲成形后壁厚的有效控制,依据确定偏心量的理论计算公式所确定的偏心量,能够保证弯曲成形后管件壁厚在允许的偏差范围。文章为解决厚壁管弯曲成形的壁厚控制问题提供了一种新的技术途径。
According to the cold forming characteristics of large-diameter thick-walled tubes, the hot section of the main pipe of AP1000 is taken as the research object. The precast eccentric tube can be used to effectively control the wall thickness of cold-formed tubes. By analyzing the relationship between eccentric eccentricity of billet and bending wall thickness after tube forming, the selection range of eccentricity is obtained, and the theoretical formula for determining the lower limit of eccentricity is given. The results of the cold bending test show that the eccentric tube can effectively control the wall thickness after the tube is bent and formed. According to the eccentricity determined by the theoretical calculation formula to determine the eccentricity, the bending can be guaranteed After forming the pipe wall thickness in the allowable deviation range. The article provides a new technical approach to solve the problem of wall thickness control of thick-walled tube bending.