Study On Vibration Control Of Double Crank High-speed Press

High speed stamping machinery is widely used in modern engineering fields such as aerospace,electronic communication,automobile manufacturing and so on.With the increase of stamping stroke times,high-speed stamping machinery will inevitably produce vibration and noise during stamping,which will seriously affect the dynamic performance of the lower dead center of the slider,so as to reduce the machining accuracy.Therefore,the research on vibration control of high-speed stamping machinery is of great significance to improve the dynamic performance of mechanical equipment and improve the quality of products.Firstly,according to the structural characteristics of the press,the motion law and mechanical characteristics of the transmission mechanism are analyzed,and the unbalanced inertial force in the stamping direction of the system is solved.Taking the box as the key component of the press as the research object,the finite element model is established.According to the stamping condition,the maximum deformation of the box is solved according to the static analysis,and the low-order natural frequency and formation of the box are solved according to the modal analysis.The results show that the body is the main deformable part of the box body and the natural frequency of the box body does not resonate with the working frequency of the motor.Secondly,the causes of vibration are analyzed,the dynamic parameters of key parts of the press are solved by workbench,and the stiffness and damping of vibration isolator are selected.Based on the lumped parameter method,the three degree of freedom dynamic model of the whole machine is established,and the Runge Kutta method is used to solve the vibration characteristics of the stamping machine.The effects of inertial force,impulse pressure,box mass and vibration isolator parameters on the amplitude of the machine are quantitatively analyzed,which provides a theoretical basis for the vibration control research of high-speed stamping machine and improving the mechanical dynamic performance.Then,taking the inertia force as the key factor affecting the vibration of the press,the mechanism balance simulation optimization design is carried out.The method of inertia force balance of high-speed press is analyzed,and the mechanism balance scheme is designed by using the approximate symmetrical arrangement mechanism method.The mass of the connecting rod and slider of the additional balance mechanism is taken as the optimization variable,and the weighted sum of the variable momentum of the inertia force of the moving parts on the spindle in the vertical direction FY and horizontal direction FZ is taken as the optimization objective function.The optimal scheme is solved by ADAMS simulation.The results show that the mechanism balance optimization design can improve the mechanical dynamic performance and control the vibration response of the press.Using the function of the flywheel to adjust the motor speed fluctuation,the whole machine as a single degree of freedom mechanical dynamics system,according to the mechanical characteristics of the motor,determine the flywheel inertia and structural design.Finally,in order to verify the feasibility of inertial force balance design to improve the dynamic performance of the mechanical system of the whole machine,the vibration test experiment is designed,the hardware and software composition scheme of the experiment is determined according to the requirements,the vibration test bench system is built,and the vibration experiment is carried out.According to the designed experimental scheme,the vibration response of the press body under different equilibrium states is measured.The experimental results show that the inertial force balance of the mechanism is of great significance to improve the mechanical dynamic performance and reduce the amplitude of the press.