Finite Element Analysis And Lightweight Design Of Gantry 8000 Bender

Bending machine,as one of the most important machine tools for sheet metal processing,has been widely used in various fields.Super large CNC bending machine is the development trend of bending machine.However,most of the benders are conservative in design,and the weight of the fuselage is too large.In order to reduce the production cost of the bender and improve the efficiency of the bender,based on the relevant research at home and abroad,this paper carries out a lightweight design of a super large gantry bender.(1)Calculate the loads of the relevant parts of the bending machine according to the rated loads,use the finite element software to analyze the static of the bending machine model,and judge whether the mechanism of the bending machine is reasonable through the static analysis results,which lays the foundation for the next lightweight design.(2)Using SolidWorks to parameterize the model of bending machine,the thickness of several plates which have great influence on the deformation and stress of bending machine is set as parameters,and the model is imported into ANSYS-Workbench.The response surface analysis method is used to determine the maximum deformation and stress of the bender with the lowest quality as the objective function,and the constraints of the parameters are selected to solve the problem.After rounding the optimized parameters by response surface method,the static analysis of the model was re-established,and the optimized results were compared with those before optimization.(3)Orthogonal experimental design is carried out.Two factors(diameter of tie rod and thickness of stiffened plate)which are not convenient to be added by response surface method are added.Orthogonal experimental table is designed.Finite element analysis is carried out according to the experimental group number.The influence degree of each factor on relevant state variables is analyzed by solving the data obtained.The condition is set with the minimum quality of bender as the objective function.The boundary conditions of state variables and dimension variables are used to establish a lightweight mathematical model of bending machine.The model is solved by using MATLAB software.The parameters are rounded and re-modeled for finite element analysis.The optimized results are compared with those before optimization.(4)The first ten natural frequencies and mode shapes of the optimized model are obtained by modal analysis.The influence of different modes on the bender is analyzed,so that the bender can avoid resonance in normal operation.Finally,the result of orthogonal test is better than that of response surface optimization.The weight of fuselage is reduced by 42510 kg and the weight of lightweight reaches 4.12% compared with that before optimization.The aim of lightweight is achieved while ensuring the normal operation of bending machine.