Hybrid-loop servo control system of double toggle mechanical press for flexible forming process based on sliding mode control and neural network techniques

Abstract

A hybrid-loop servo control system based on sliding-mode control and neural network control is proposed in this article to realize flexible forming process on a double toggle mechanical press. First, kinematics and dynamic analysis of the drive system are conducted to derive the control objective behavior. Then, the structure of the hybrid-loop system is introduced; sliding-mode control is applied to compensate the punch position errors. In the inner loop of the servo motor, complementary sliding-mode control is used to track the motor rotation angle, and a radial basis function neural network estimator is applied to eliminate the considerable load disturbances in the stamping stage. Finally, experimental hardware is constructed and a compound blanking and drawing process is carried out to validate the proposed servo control system in practice. With different materials and drawing depth, high tracking accuracy and robustness are exhibited to realize favorable forming performance.

Decomposition analysis and peak stagger design for Crank-triangular linkage-elbow mechanism of mechanical servo presses

“…In order to better characterize its structural features, it is called Crank-Triangular Linkage-Elbow mechanism (CTLE) in this paper. CTLE has attracted extensive attention from researchers and manufacturers of servo presses owing to its good kinematic and dynamic characteristics [4,5,[9][10][11][12]. Especially, CTLE has a high mechanical advantage and low and steady speed in S n , meeting the requirements for mechanical servo press [1,11].…”