Anti-springback forming compound die for variable-curvature front edge skin part and brake pressure forming method

The invention belongs to the technical field of aviation aircraft sheet metal part machining, and relates to an anti-springback forming compound die for a variable-curvature front edge skin part and a brake pressure forming method. The compound die comprises a base, a polyurethane limiting block, a flexible positioning check block, a bent handle cylindrical plug pin, an inner hexagon bolt, an upper die connecting plate, an upper die, a lifting bolt, a positioning pin, a positioning plate assembly, a straight supporting block, a bent supporting block, a long connecting plate and a short connecting plate. Pressure is applied to the anti-springback forming compound die at a time through the plate bending press machine, and the purposes that after forming, the variable curvature angle is accurate, parts do not springback, and the fit degree guarantees the 0.5 mm tolerance are achieved. The forming requirements that the forming efficiency of the variable-curvature front edge skin part is high, the surface quality