Finite Element Analysis And Optimization On Structure Of 12500kN Cold Forging Press

Multi-link cold forging press is one of the developing trends of cold forging press in the future,but there is less research on cold forging press.In this paper,ANSYS Workbench is used to analyze and check the closed combination frame,complete machine and important parts of the press,and put forward the structural optimization model.The models of frame structure optimization is presented.The characteristics of the frame structure of the 12500 kN cold forging press are analyzed,and three kinds of mechanical model are proposed.Finite element calculation was carried out by Workbench software to study the influence of different stress models,different preload and different guide rail clearance on the stress and deformation of the frame.The results show that,to a certain extent,the horizontal lateral force,preload and guide clearance all influence the deformation of press and then the forming precision of press.It is reasonable to select 2-3 of the preload coefficient of the 12500 kN cold forging press,at the same time,the stress of the frame and the tie bolts are within the allowable range.The rigidity,strength and stability of the original press are analyzed and checked.And the calculation results show that the performance of the whole frame and some important parts of the press meet the operating requirements.No matter under the condition of center load or eccentric load,the stress of the press are almost under 40 MPa,the vast majority of all parts of the deformation also satisfies the requirement of rigidity,the stability coefficient of the column is calculated to be 1.48 so the unstability will not occur.So the frame and important parts of the press meet the requirements of use and there is space for further optimization.According to the actual load,the finite element model of cold forging press and die was established to complete the force analysis.The results show that the press and the dies will influence each other in the working process.The maximum stress in the dies decreased by 83 MPa and the maximum deformation decreased by 1.17 mm.In the two analysis methods,the stress and deformation zones of die and press are basically the same,so different analysis methods do not affect the qualitative analysis of each part.Based on the calculation results,the optimization scheme of frame is proposed.Taken the body weight reduction as the objective function,and the body stress and deformation as the constraint conditions to establish the mathematical model.The optimization scheme that can reduce the weight of the frame 7122 kg,means that 9.6% of the total weight is proposed by the finite element method.Through static and dynamic finite element analysis,the feasibility of the optimized scheme is verified.