Optimization Design of Preforming Geometric Parameters for Cantilever Ring with Complex Structure

The inhomogeneity of the metal continuous grain flow in preformed blank with complex structured cantilever ring is determined by billet geometrical parameters. In this paper, the influence of the geometric parameters of the blank on the flow of preformed metal is studied mainly by FEA, and then the geometric parameters of the cantilever ring preformed blank are optimized and designed based on the orthogonal method, and the order of influence is obtained, namely, the radius R of the round corner at the root of the cantilever ring branch > the angle α of inclination at the bottom of the branch > the fillet radius r of the branch end. A Second-order response surface model between displacement and geometric parameters of the blank is built by the response surface method, and the optimal geometric parameters are obtained: R = 11.89 mm, α = 12.87°, r = 3.92 mm. Combined with the experimental results, it is shown that each branch of the optimized preform can fill the branch cavity at the same time, and the maximum load of the preform is reduced by 16.6% compared with that before optimization, and the reliability of the optimized result is verified.