加工精度と生産性の向上を目的としたスライド速度と背圧荷重の多目的最適化

抄録

In precision forging, near net-shape forming producing high product quality without secondary processing plays a crucial role for saving the wasted material as well as the high productivity. Recently, the validation of the forging using servo press for near net-shape that the back-pressure and the slide motion can freely be controlled has been reported. In this paper, both the back-pressure and the slide velocity are optimized. They are conventionally determined by a trial and error method, but it is much time-consuming. In this paper, computer aided engineering (CAE) coupled with design optimization is used to determine them. Standard deviation of surface pressure is used to evaluate the product quality, which is minimized. On the other hand, processing time is also taken into account for the productivity. Therefore, a multiobjective design optimization is performed. The numerical simulation is so intensive that a sequential approximate optimization (SAO) with radial basis function (RBF) network is adopted to determine the optimal back-pressure and the slide velocity. Through the numerical simulation, the trade-off between the standard deviation of surface pressure and the processing time is clarified.