Kinematic And Dynamic Optimization Design Of Servo Press Elbow-Bar Mechanism

Servo press is abandoning energy consumption of the traditional mechanical press such as flywheel and clutchs.And can precisely control the slider position and velocity.On the basis of computer control system. It can achieve a variety of different processes curves of the slider movement by changeing the procedures. Servo mechanical press become increasingly important in the forming process as compounded, high efficiency, high-precision, highly flexible, low noise, environmental protection and other features. The servo-driven presses using conventional crank rod, have little force increasing ratio and require larger motor power, which restricts its development. Servo press with triangle toggle has the following advantages:triangular elbow bar linkage is simple structure but high rigidity;with quick return characteristics, can be well adapted to forming requirements; the slider in working stroke has better low-speed motion characteristics; triangle toggle mechanism has the characteristics of great force increasing ratio, can reduce the servo motor controlling and reduce the power requirements of the motor to achieve energy saving.Basis of the inverse design principles, the triangle toggle institutions is analysised and designed when the slider at the bottom dead center, which reducing the design variables. The agency model is scaled with proportion parameters, which improving the flexibility of the design. The mathematical calculation mode of kinematics and dynamises was established by using vector equation analysis method and kinetostatics method.Using the MATLAB optimization toolbox, the multi-objective function of the kinematics and dynamics of the triangular toggle is optimized to get that the engineering stress slider travel speed fluctuation is smaller and the drive torque required for institutions is samller. And get a system. The system was modeled in ADAMS to examine the calculations. The calculated velocity-displacement curve of the slider, the driving torque curve under4000kN load, and the output force curve of the slider under rated torque were validated in the software. The calculated and the simulated matched well. The thesis analyzed the calculated system, and the results show that, the proper location of hinge which connects the crank and the rack is at the top part of the vertical direction. It is better to decrease weight of the triangle elbow-bar but increase the slider’s weight. The proper location of the center of the mass of the slider is near the original moving parts, while the center of the mass of both the upper and lower elbow is at their shape center. And these made the required maximum drive torque lower.Triangular toggle bodies contain many revolute joints. The revolute joints friction has a greater influence on the triangle toggle institutions. In particular, this effect is more obvious in large servo presses. This article will calculate the rotational frictional with the kinetic model. Considering the friction, the multi-objective function of the kinematics and dynamics of the triangular toggle is solved by using particle swarm optimization.And get some results which are more consistent with the actual body parameters. Analyzing from the calculated results, we found that the energy from the friction of hinges is account for23.99%of the total. Comparing with the optimized results from Chapter2, the required torque from the Particle swarm optimization is3198.76N-m less than it is in the MATLAB optimization toolbox, and so it is with the fluctuations in the value of the velocity. Therefore the superiority of the Particle swarm optimization was confirmed.