如图1所示机身隔框典型Π形变切面平板板弯件,材料为LY12M,料厚为2毫米,按常规此类零件一般都采用液压成形。但此类零件采用液压成形是弊多利少,尤其是零件外缘的凸弯边尺寸较高(～60毫米),毛料又是扇形料(排样如图2),在Π307液压机上成形, As shown in Figure 1, the fuselage bulkhead typical Π deformation plane slab curved plate, material LY12M, material thickness of 2 mm, according to conventional such parts are generally used hydroforming. However, the use of such parts hydroforming is more harm than good, especially in the outer edge of the convex edge of the larger size (~ 60 mm), wool is fan material (Figure 2), Π307 hydraulic press forming,