On Dynamic Performance Analysis And Design Of A Multi-Link Servo Mechanical Press

Forging machine is one of the most important equipments in manufacturing and also are main equipments in some industries such as information, electricity, machinery, automobile, instrument and so on. Based on AC servomotors, NC heavy duty mechanical driving is a combination of new and high technology and traditional mechanical technology. Servo Driven mechanical press is a kind of controllable mechanism possesses merits both of the traditional press with high speed, effective, lost cost and modern parallel mechanism with high precision and controllability. This paper combines the urgent need of high-quality forging sheets by state's major industries and present research status of mechanical press, with the support of National High-Tec Research and Development Plan, a comprehensive research on multi-link servo press is developed including feature modeling of stamping operation, architecture topology design, kinematic modeling, dimension optimization base on atlas, performance character and elasto-dynamics which take account into screw and servo motor constrain. The paper has six chapters with following contents:Through study the heavy multi-bar press stamping operation feature, a NUEBS-based representation is applied to model the feature of stamping operation and trajectory planning of ram motion that makes sure the ram motion matching the deformation rule of work piece material. New type press architecture for different task is evolved using topology theory.Compared the difference between traditional press and servo driven press, the ideal architecture for servo press is work out. Study the high-level differential equation to define the relationship between kinematic and force distribution. Set up functional index to reflect the servo press performance, using space model to draw the atlas which provide base for dimension optimization.Based on virtual prototype technology to modeling the servo press linkage and simulate the press kinematic and dynamic characters. Define workable region under screw and servo motor constrain. Transfer the rigid linkage to flexible ones to validate the linkage strong and stiff.According to the characteristics of the servo press, the dynamic equations of the flexible links and rigid bodies are described in the local coordinates. Then the differential equation of the system is formulated using the kinematic relationships between the links and the rigid bodies. The static stiffness and dynamics are analyzed when the ram is arbitrarily set in different positions in the working space by the commercial FEM software ANSYS. Compare the results which analysis in ADAMS to assure the model accuracy.