Dynamic Analysis And Structural Optimization Of Unequal Length Double Crank Mechanism Of Servo Fine Blanking Press

The servo fine blanking press can not only improve the utilization rate of materials,product output and product processing quality,but also has the advantage of large slider stroke,and can obtain various motion curves according to the drive program of the servo motor to achieve flexible production.Purpose.In this paper,an in-depth study of the unequal-length double-crank transmission mechanism of the servo fine blanking press is carried out:Firstly,the mathematical model of the unequal-length double crank transmission mechanism is established.Aiming at the mechanism in this paper,the kinematic formulas of each connection point of the slider and the rod are deduced by using the complex vector method,and the angular displacement,angular velocity,angular acceleration formulas of each rod,and the slider displacement,velocity and acceleration formulas are obtained through calculation.Then the corresponding mathematical model is established.According to the characteristics of the stamping process and considering the product cost,the speed of the slider in the stamping stage and the minimum driving torque required by the servo motor are established as the objective functions,and the rigid body parametric optimization model of the transmission mechanism is established by using ADAMS software,and the optimized solution is obtained.The rod system parameters improve the rapid return characteristics of the transmission mechanism and reduce the maximum driving torque of the servo motor.In order to study and analyze the dynamic characteristics of the transmission mechanism of the servo press,the finite element model of the transmission mechanism was designed and established,and the dynamic performance was studied.Using the modal analysis method,the first six vibration modes and natural frequencies of the transmission mechanism are obtained to prevent the occurrence of resonance.In addition,this paper also analyzes the dynamic response of the mechanism,finds the weak point of the mechanism under the influence of dynamic load,and studies the vibration effect of the transmission mechanism on the fuselage.Taking the minimum mass of the connecting rod body as the goal and the dynamic stress of the connecting rod as the constraint condition,the paper uses the neural network genetic algorithm to establish the mapping relationship between the connecting rod parameter variables,the mass and the dynamic stress,and optimizes the structural parameter variables.Lightweight design of unequal length double crank transmission mechanism.The mass of the connecting rod body after optimization is reduced by 82.1%compared with that before optimization,and its dynamic stress distribution is greatly improved.