Drawing forming method for large-curvature thin-wall spherical wedge-shaped tail cover skin

The invention discloses a deep drawing forming method for a large-curvature thin-wall spherical wedge-shaped tail cover skin. The deep drawing forming method comprises the following steps that a deep drawing process face of a lower tail cover skin is constructed; determining the size of an unfolded blank; a drawing die structure of the lower tail cover skin is designed step by step; drawing and forming for the first time; performing secondary drawing and sizing; and trimming the appearance. According to the method, the wedge-shaped closed drawing working procedure piece with the springback closing-up surface is designed according to the hyperbolic structure of the cover body skin, the material plastic deformation area in part drawing forming is enlarged, and the springback problem that conventional drawing forming of the open-curvature skin cannot be controlled is solved. 本发明公开了一种大曲率薄壁球面楔形尾罩蒙皮的拉深成形方法，包括以下步骤：构造下尾罩蒙皮的拉深工艺面；确定展开毛坯尺寸；分步设计下尾罩蒙皮的拉深模结构；首次拉深成形；二次拉深校形；修切外形。本发明依据罩体蒙皮的双曲结构设计了带有回弹收口面的楔形封闭拉深工序件，加大了零件拉深成形中