Research On Vibration Analysis And Control Of Mechanical Servo High Speed Fine Blanking Press

As a precision processing equipment,the high-speed fine blanking machine has high requirements on machining accuracy.However,the vibration of the fine blanking machine can cause machining displacement errors and reduce machining accuracy.The vibration affects the reliability of the high-speed fine blanking machine and reduces the service life of the machine.Since the mechanical fine blanking machine needs to pursue higher punching frequency and longer life,compared with the hydraulic fine blanking machine,the vibration of the actual produced mechanical fine blanking machine is more serious.However,at present,the research on vibration control of mechanical fine blanking machine is basically in the starting state.The passive vibration control measures adopted by the traditional presses have poor performance in low-frequency control,and less systematic vibration control measures are adopted for the shaking source.Therefore,it is of great significance to explore the vibration characteristics of mechanical high-speed fine blanking machine and study the vibration control method suitable for mechanical high-speed fine blanking machine to reduce mechanical vibration and improve machining precision and service life.The research of this paper is carried out by the combination of theoretical analysis,numerical simulation and experiment.The vibration performance of the3200kN mechanical fine blanking machine is analyzed systematically and used as the object to discuss the corresponding control methods.The main contents of the thesis include:1)The finite element models of the whole 3200kN mechanical fine blanking machine,the fuselage part and the main transmission part are established,and the constrained modal analysis of each part is carried out.Then the natural frequency and mode shapes of the whole machine and each part are obtained.Combined with the shaking frequency of the main shaking source on the fine blanking machine,the results of the constrained mode are analyzed to determine whether there is a strong vibration such as resonance.2)Operational deflection shape(ODS)method is used for the vibration test.The composition of the vibration test system is determined and the vibration test plan is designed.Then,according to the vibration test plan,the vibration test of the 3200kN mechanical fine blanking machine is carried out,and the time domain and frequency domain response of the workbench area is obtained.3)Analyzing the kinematics and static dynamics of the main drive system of3200kN mechanical high-speed fine blanking machine using the analytical method,and the formula of shaking force and shaking moment of the main drive system is derived.Based on the results of kinematics and dynamics analysis,the integrated dynamic balance optimization method is used to improve the mass distribution of the main transmission mechanism.After the optimization,the maximum values of shaking force F_X,F_Y and shaking moment M are reduced by 18.2%,1.67%and16.66%,respectively.It achieves the passive control of the vibration.4)Adaptive feedforward control is used to simulate the active vibration control of mechanical fine blanking machine.The principle of vibration control of fine blanking machine is expounded,and the control algorithm is established.At the same time,the vibration mechanics model of the fine blanking machine as the controlled object is established.Then the parameters of the excitation input and the mechanical model are determined by the blanking simulation and the finite element simulation.Finally,based on MATLAB software,the numerical simulation and analysis of active vibration control are carried out.The results show that the control effect is better and the vibration response is effectively reduced.