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PFP逐步折弯成形法采用冷加工折弯方式成形直缝焊接圆管,免去了热加工锻造法中将钢板毛坯加热、锻后正火处理等热处理工序,应用固定的上模和可调节宽度的下模,减少了开模数量,扩大了加工范围。根据圆管内径、壁厚、中性层弯曲半径确定圆管展开毛坯钢板尺寸。由于圆上各处曲率相等,可以确定每次成形圆弧的弧长及圆弧对应的圆心角等要素,利用CAD制图分割整圆,在毛坯钢板上划线标识折弯成形次数及折弯工艺顺序,钢板在折弯机上逐步折弯成形,最终获得了合格的单直缝焊接圆管。
PFP step-by-step bending method using cold forming straight-welded pipe bending method, eliminating the need for hot forging method in the steel blank heating, forging after normalizing and other heat treatment process, the use of fixed die and adjustable width Under the mold, reducing the number of open mold, expanding the scope of processing. According to the tube diameter, wall thickness, bending radius of the neutral layer to determine the rough tube size of rough steel. Because the curvature is the same everywhere on the circle, the arc length of each arc and the center angle of the arc can be determined. The whole circle is divided by CAD drawing, and the number of bending forming and the bending process are marked on the blank steel Order, the steel plate in the bending machine gradually bending forming, finally obtained qualified single straight seam welded pipe.