带颈口的法兰盘采用无冲孔凹模复合模一次冲压成型,是一种板料强化冲压方法。成型时,颈口壁厚从法兰盘到端面逐渐减薄,实践证明:用此法成型的零件,颈壁变薄一致,其壁厚小于法兰盘厚度的一半,颈口高度可达其直径的0.6倍。图1a为初始状态,凹模5与压料板2,凸模3与顶料板6同时压紧板料4(模具下弹顶装置在凸模运动时对顶料板施以反作用力)。当凸模下行时(见图1b),板料在凹模与凸模之间未被压紧的 Flange with neck finish using punching die composite die stamping, is a sheet metal stamping method. Forming, neck wall thickness from the flange to the end gradually thinning, proved that: the method of forming parts, thinning the neck wall, the wall thickness is less than half the thickness of the flange, neck height up to its 0.6 times the diameter. FIG. 1a is the initial state, the die 5 and the blank 2, the punch 3 and the blank 6 while pressing the sheet 4 (under the mold ejector device in the punch movement of the reaction to the top plate). When the punch down (see Figure 1b), the sheet material between the die and the punch is not compressed