大直径钢制管法兰作为密封和紧固连接件在航天航空及石油、化工等领域的大型容器中有着广泛的应用。尽管不考虑加工能力的问题，对于大直径钢制管法兰，由于其尺寸过于庞大，仅由于运输上的原因，就使得大直径钢制管法兰的整体加工是不可能的，必须分瓣加工。Large-diameter steel pipe flange of the overall process is impossible, and it is divided flap processing. 通常情况下，总是将大直径钢制管法兰成若干弧段进行加工。Under normal circumstances, always large-diameter steel pipe flange into a number of arc segment for processing. 首先，将毛坯锻成方坯，然后冷弯成弧段，退火去应力热处理后，拼成整圆在立车上加工到设计的形状和尺寸，最后运至施工现场，再将若干弧段组First, rough forging into a billet, and then cold-formed into arcs, annealing to the stress relief heat treatment after the board makes up the entire round in the legislative process to design the shape and size and finally transported to the construction site, and then a number of arc group 焊成完整的法兰并与压力容器组焊。welded into a complete flange and with the pressure vessel welding.
对于一些大型压力容器上使用的与封头相连的法兰，为了保证法兰密封面的平面度和加工精度，在采取了上述的法兰加工工艺完成法兰本体加工，将法兰与封头For some large-scale pressure vessel for use connected with the head flange, flange sealing surface to ensure flatness and processing accuracy, taking the above-mentioned flange flange body processing technology to complete processing, the flange and the head 焊接在一起之后，还应在大型立式车床上再进行法兰密封面的精加工。welded together should be followed by a large vertical lathe further flange sealing surface finish.
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