Seven-bar mechanical press with hybrid-driven mechanism for deep drawing; Part 1: kinematics analysis and optimum design

Abstract

The main feature of hybrid-driven linkage is the combination of the motion of a large constant velocity motor with that of a small servomotor via a two-degrees-of-freedom mechanism. Thereby, the hybrid-driven linkage can provide for programmable motion output. In the present study, a mechanical drawing press driven by a hybrid mechanism was optimized for displacement and velocity. An analysis of forward kinematics and an optimum model are presented. The actual displacement curves of the slider can approach the ideal ones by means of a two-step optimization. The dimensions of the linkage and the motion rules of the servomotor were optimized. The flexible features of the hybrid-driven drawing press are effectively demonstrated by three optimum examples. The optimum results validate the advantages of the hybrid-driven seven-bar mechanical press, such as its flexible slider speeds and adjustable strokes for drawing operations. By properly designing the input motion of the servomotor, the slider can pass through the desired trajectories.

The Design of Mold Clamping Mechanisms with Two Dead-Position Configurations

“…Firstly, by referring to the existing patents [1][2][3][4][5][6][7] and the studies on the creative design [8][9][10][11][12][13], four feasible design concepts of mold clamping mechanisms are synthesized. Then, according to the studies on kinematics of mechanisms [14][15][16][17][18][19][20], three mold clamping mechanisms with two dead-position configurations are also synthesized. When the mold is in open and closed positions, the mold clamping mechanism will stay in the state of dead-position configuration (meanwhile, the mechanism is converted to desired structure).…”

Hybrid Seven-bar Press Mechanism

“…A hybrid five-bar configuration is presented with related kinematics and its mathematical model. Li and Zhang [9] have used a seven-bar mechanism press with hybrid driven case for deep drawing. M. E. Kütük [10] has performed a study on inverse kinematics issues on hybrid driven seven-bar mechanism with motion design for press application.…”

High mechanical advantage design of six-bar Stephenson mechanism for servo mechanical presses

“…The output motions from the IM and PMSM were synthesized by a 2 degree-of-freedom hybrid drive mechanism. Du and Guo, 2 Meng et al, 3 Li and Zhang, 4 Guo et al, 5 and Ouyang et al 6 conducted the studies on a 7R-type seven-bar linkage. He et al, 7,8 Tang and Guo, 9 and Soong 10 conducted the studies on a 5R2P-type seven-bar linkage.…”