Special equipment for processing inner holes in bending section of the main pipeline in nuclear power plant

• Main Authors: Wenwu Zhang, Jingbo Wang, Guangchen Xu, Lin Qian
• Format: Article
• Language: English
• Published: Wiley 2020-10-01
• Series: The Journal of Engineering
• Subjects: nuclear power stations; pipelines; cutting; pipe flow; grinding; cutting tools; boring; bending; stainless steel; pipes; boring cutter head; nuclear power main pipeline; pipe bending section; ap1000 nuclear power plant; straight pipes; elbow pipe; bending angle; inner hole processing; grinding method; imitation processing equipment; fixed circular arc guide; fixed arc curvature guideway
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2020.0063

Because of the special forging material and complex pipe structure of the main pipe of the AP1000 nuclear power plant, a single general equipment can not meet the requirements of machining the inner hole of the bending section. At present, most of them adopt the method of approaching theoretical dimension by manual grinding, which makes the labor intensity of workers large, the work cycle is long, and it is difficult to ensure the machining accuracy of the workpiece. In view of the practical difficulties in processing the elbow inner hole of nuclear power main pipeline, the copying processing equipment is designed. The fixed circular arc guide rail is used in the equipment. The arc curvature of the guide rail is the same as that of the workpiece. The boring cutter head moves axially along the fixed circular arc curvature guide rail for copying boring. After testing, it fully meets the requirements of the shape, position and size accuracy of the inner hole in the bending section of the nuclear power main pipeline. The method is efficient, accurate and innovative, and provides reference for similar product processing schemes.