Design of Hybrid-Driven Servo Press Mechanism

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.