The invention provides an integral liquid-filling forming method for a large annular lip part, belongs to the technical field of
aviation aerospace sheet
metal forming, and can solve the problem thatlarge annular lip parts are difficult to integrally form. The method comprises the steps of design and manufacturing of a transition forming die and a final forming die, selection and debugging of technological parameters, post-
processing and the like. According to the method, a novel technology of multi-step liquid-filling forming is carried out on the basis of guaranteeing integral forming of the lip parts; and the integral forming of the lip parts is realized through a two-sequence liquid filling forming process and a one-sequence shaping process. The method has the advantages of being highin forming limit, high in size precision, good in surface quality, low in cost and the like, and can effectively reduce the problems of uneven deformation,
thinning or serious wrinkling in local areas, difficult
elimination of resilience and the like in a traditional
stamping mode, so that the local defects of the lip are reduced and the advantages are remarkable. Meanwhile, the technology can bepopularized to other parts with similar characteristics, and has good development potential.