Multi-step hydroforming process technology of aero-engine guide vane Liner

In the process of forming large expansion rate parts with complex cross section, the traditional hydroforming process is restricted by the mould surface, and it is difficult for the materials to flow uniformly in the ring, resulting in the failure of forming. Aiming at the above problems, the paper presents a new process of progressive hydroforming process by decomposing the deformation process of the material into two stages of girth increase and shape buckling. The finite element method is used to analyze the distribution of materials in the process of dangerous point forming, so as to establish a progressive forming model and experiment with it. Results show that the multi-step tube hydroforming technology can effectively reduce the thinning of materials at high pressure forming stage, improve the forming precision, reduce equipment load.