This paper discusses mechanical digital servo press control system and operating characteristics and adaptability to the hot forming requirements of high strength steel using the toggle mechanical presses [1-4]. A servo motor drive control strategy is made to adapt the stamping process. This paper describes results acquired by applying toggle mechanical servo press developed by author to the hot forming of high strength steel [5-7].

To realize the cushioning optimization of multilayer regularly-arranged circular honeycombs under in-plane crushing loadings with high impact velocities, a finite element model is introduced to obtain the cushioning mechanical parameters. A simplified energy absorption model is used to evaluate the cushioning performance, which shows that the cushioning performance is related to dynamic plateau stress and dynamic densification strain. The impact velocity, deformation mode and configuration parameters determine them. Empirical formulas of critical velocity of deformation mode transition, dynamic densification strain and dynamic plateau stress are given from the discussion of numerical results. A feasible cushioning optimization algorithm is presented in detail.