Optimum Design And Dynamic Performance Research Of High-speed Press

The development of high-speed stamping technology has promoted the development of high-speed presses,and it's a great significance to have a study on dynamic performance for the high-speed press.The paper takes high speed press as the research object based on dynamic indicators,combining theoretical analysis,numerical calculation methods,finite element methods and test techniques,and does the research varying from the innovation design of the transmission mechanism and the optimization design of the motion scale,the optimization design on comprehensive balance of high-speed press mechanism,the multi-rigid dynamic analysis,the dynamic analysis of the fuselage structure to the experimental design of the vibration test,in order to improve the dynamic performance of high-speed presses.First of all,all the six-link and eight-bar linkage configurations that meet the design requirements were designed,based on the configuration of the existing press mechanism,using the innovative method of the regenerative kinematic chain and assur group method,providing a theoretical design flow of configuration design of multi-link mechanism transmission machinery,and the final configuration is determined by multi-factor evaluation.Further,taking the minimum speed fluctuation of the punching slider within the stamping stroke as an index,integrating transmission mechanism space geometry and transmission performance requirements,the scale optimization design was finished by genetic algorithm.The slide motion law between the optimization design and empirical design was compared based on the kinematic analysis,and the effectiveness of the optimization scheme was verified.Secondly,for the vibration caused by the imbalance of the mechanism of a high-speed multi-link press,a comprehensive optimized balance was proposed.With the 9 mass attribute parameters of the balance mechanism as the design variables,the linear weighted sum of fuselage's vibration response amplitudes in three directions was taken as the objective function,and the genetic algorithm was used to solve the problem.Taking the high-speed multi-link experimental press as an instance,the traditional balance based on the inertia force and the comprehensive optimization design based on the vibratory response were obtained,with both of the vibration response being compared.Furthermore the orthogonal experiment was designed to study the influence of each optimization variable on the dynamic response of the fuselage in three directions by analysis of variance.Then,the high-speed press' s dynamic performance analysis subjected to impact loads was made,including multi-rigid dynamic analysis of the transmission system and structural dynamic analysis of the fuselage.Based on the first type of Lagrangian equation,a multi-rigid dynamics theoretical model was established,and the virtual prototype simulation technology was used to solve the excitation load of the fuselage.The dynamic characteristics of the fuselage were studied by the modal analysis in ANSYS to get the natural frequencies and formations in order to avoid resonance.The transient dynamics analysis of the fuselage was performed to solve the dynamic response at the key points of the fuselage under the excitation load and analyze the vibration of the fuselage.Finally,based on the high-speed press test bench,dynamic response measurement program of the vibration system was designed,along with the hardware and software design.According to the experimental design scheme,the time domain signal and the frequency domain signal of the fuselage under different balance levels were measured,at the same time,the effectiveness of comprehensive balance design is verified.