Research On Structural Optimization Design Of Multi-link Press

Press is a widely used mechanical equipment in the manufacturing process of aerospace,precision electrical appliances,automotive industry and other fields.With the continuous advancement and deepening of "intelligent manufacturing 2025",the demand for press equipment is growing day by day,and the competition in the industry is becoming more and more fierce.Exploring modern design methods of more efficient and low-cost presses,innovating the design of transmission mechanisms and fuselages,and obtaining transmission mechanisms and box structures with better kinematic and mechanical characteristics are of great significance for breaking through traditional empirical design and exploring modern engineering design techniques for machine structures.This article takes the multi-rod quasihigh-speed press in the series of stamping machinery experimental bench as the research and design carrier,carries out the innovative design of the transmission mechanism,the structural design of key components considering the dynamic and static characteristics,and the design and exploration of the fuselage structure based on the topology optimization theory and performance constraints,and the specific research content is as follows:(1)Compared to configuration scheme affect the performance of stamping,combined with the press performance indicators to explore "the slider,toggle,triangle connecting rod" connection mode of transmission mechanism motion and the influence of mechanical properties,closed-loop vector method is adopted to establish the organization scale,location and movement equation,the characteristic of slider speed fluctuation minimum,stamping mechanical gain maximum,The crank existence conditions were optimization constraints,and the mechanism size and position were optimization variables.Genetic algorithm was used to optimize the design of the three connection schemes,and the performance differences under different connection schemes were explored.The scheme was optimized after ADAMS verification.(2)Combined with the movement space and connection mode of each component,referring to the theory of structural design,the structural scheme design,size design and performance check of the key parts of the main motion mechanism,including crankshaft shafting,connecting rod,guide rail and slider,box body and other parts.Based on the theory of inertia force balance,the upper balance slider was designed considering the dynamic characteristics of the transmission mechanism during operation.At the same time,the equivalent dynamics model of multi-bar press was established to solve the periodical velocity fluctuation problem of press,and the flywheel structure was designed based on the theory of maximum profit and loss.(3)Considering actuator runtime time-varying inertia force of machine body force,the influence of a on the basis of dynamic statics analysis,analytic hierarchy process(AHP)decision matrix for weighting factor,combined with the compromise programming method to define the fuselage optimization models of working condition of stiffness,the fuselage of the bearing under the dynamic force of optimization design problem is converted into static condition more stiffness optimization problem,The optimal material distribution was determined based on the optimized material density cloud map,and the conceptual configuration design of the press fuselage was explored combined with the structural technicality.(4)According to the designed fuselage conceptual configuration scheme,optimize the design of key structural dimensions of the upper beam and the lower base.Combined with sensitivity analysis of key selection had a greater influence on the performance of structure size for as optimization variables,at the same time by the fuselage material allowable strength,allowable deformation as constraint conditions,with the fuselage quality minimizing the optimization goal,response surface optimization module of ANSYS is adopted to improve the performance driven the response surface of multi-objective optimization,based on the results of optimization for structure design and modeling,The finite element analysis verifies that the designed structure meets the requirements.