Simulation And Optimization Of Operating Mechanism And Frame Of The LTH450T High-speed Press

High speed press is automatic, efficient and precise and is widely used in modern industry. It is very suitable to product functional stamping parts tending to standardization, serialization and mass production. Compared with the general press, high speed press usually produces larger unbalanced inertia force because of high speed, so that it often has the issues of significant noise and vibration, which seriously effecting the machining accuracy, efficiency of the press and die life. LTH450T series closed-type three-point high speed precision press is taken as the research object in this paper to research the issues of vibration and noise reduction with the methods of numerical simulation and finite element analysis, so that the high speed press can be used more applicably.The multi-body dynamics model of the motion mechanism of the LTH450T high speed press was built up. The kinetic and dynamic simulation analysis was studied using ADAMS. Then the optimization and improvement of the press were researched. The results show that the change value of unbalanced inertia force reduces and the dynamic balance will be more successful.Finite element model of the combined frame of the high-speed press was built up. Statics analysis, modal analysis and transient analysis of representative blanking loads were performed to combined frame. Stress and strain of combined frame, the first six natural frequency and corresponding vibration modes and dynamic response of the typical process were obtained.On this basis, based on the structural characteristics of high speed press, parameterization design model of partial sizes of press frame was established. Eight parameters most influencing the weight and the first body natural frequency was chose as design variables, which was obtained though sensitivity analysis. The smallest mass of frame was taken as the objective function and the biggest first body natural frequency and smallest deformation was taken as constraint conditions. Then multi-objective optimization design was carried out to obtain the optimal case.Finite element model of the optimized combined frame of the high-speed press was built up and statics analysis, modal analysis and transient analysis of representative blanking loads were performed to it. Compared with the original frame, the results show that the equivalent stress of optimized frame is decreased, the first inherent frequency increases obviously and it is further away from operating frequency of the electrical machinery, and the possibility of resonance is reduced, and the kinetic characteristic of the optimized frame is improved.