Design of Hybrid-Driven Servo Press Mechanism

Abstract

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.

Increased total flexibility by 3D Servo Presses

“…Servo motors are electrical actuators that operate with servo controllers in closed loops. The actuation can be torque-, velocity-or position controlled [10,11]. These presses allow flexible punch motions and a high accuracy.…”

Study of Servo Press with a Flywheel

“…The dimensions of the hybrid-driven servo press for the case study are listed in Table 1, and the dimensional synthesis can be referred to the authors' previous research (8) . In Table 1, F x and F y represent the coordinates of the F ground pivot, i.e., link 1 has a length of 288.87 mm with a fixed orientation angle of 252°.…”

“…Nevertheless, the punch trajectory planning is a challenging task, in order to meet both manufacturing needs and energy efficiency purpose. According to the authors' updated finding, the hybrid-driven servo press exhibits a great mechanical advantage while the punch position is approaching its work space boundary (the envelope of all possible punch motion trajectories) (8) , the motion 3 in Fig. 3(c) was decided accordingly.…”

“…Some relative works have been published. Du et al (7) derived the assembly and double-crank conditions for evaluating the feasibility of the linkage, and Tso et al (8) proposed an analytical synthesis method of the linkage having a double-toggle property for great mechanical advantage. The mechanical advantage, torque distribution and power distribution for the hybrid-driven servo press have been derived by Du et al (7) , based on statics.…”