The servo press with a flywheel is able to provide flexible motions with energy-saving merit, but its true potential has not been thoroughly studied and verified. In this paper, such the "hybrid-driven" servo press is focused on, and the stamping capacity and the energy distribution between the flywheel and the servomotor are investigated. The capacity is derived based on the principle of energy conservation, and a method of using a capacity percentage plane for evaluation is proposed. A case study is included to illustrate and interpret that the stamping capacity is highly dependent on the programmed punch motions, thus the capacity prediction is always necessary while applying this kind of servo press. The energy distribution is validated by blanking experiments, and the results indicate that the servomotor needs only to provide 15% to the flywheel torque, 12% of the total stamping energy. This validates that the servomotor power is significantly saved in comparison with conventional servo presses.
Servo presses are notably developed and studied nowadays out of their flexible ram motion. In practice, press users can advantageously utilize a single servo press to deal with different stamping operations such as blanking, drawing, coining, embossing, etc. In this paper, a hybrid-driven servo press mechanism is studied. The mechanism for such servo presses is a seven-bar linkage whose degree of freedom (DOF) is “2”. Two input links of the press mechanism are driven by one normal constant-speed motor and one servo variant-speed motor respectively. The dimensional synthesis of the press mechanism that is based on an analytical method is proposed. The motion function of the servomotor that generated a specified ram motion is derived by kinematic analysis. A design example is illustrated, and it shows that one could apply the proposed method to design a hybrid-driven press mechanism capable of carrying out various ram motions. This work contributes to press mechanism designers a method of dimensional synthesis. The ram motion flexibility of the servo press is achieved, and this provides significant benefit to improve the performance of any different kind of stamping operations.
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