Abstract
This paper proposes a method for determining optimal back-pressure profile in forging using a sequential approximate optimization (SAO). We consider that back-pressure profile that varied through the stroke is valid. In order to determine the optimal back-pressure profile, this object is formulated as a multi-objective optimization. Thus, the unfilled area is taken as the first objective function, and the forming energy is also taken as the second one. Computer-aided engineering (CAE) is used, but the numerical simulation in the forging is so expensive that the SAO using the radial basis function network is adopted. The pareto-frontier is identified with a small number of simulation runs. In this paper, the axial symmetric forward extrusion of aluminum alloy is used as the forming model. First, the experiment is carried out to construct the finite element analysis model. Through the numerical simulation and the experiment, we can confirm that the product quality is improved with the optimal back-pressure profile.
