Stiffness Analysis And Structural Optimization Of Large Friction Welding Machine Tools

Based on the National Science and Technology Support Program, thisdissertation presents the issues that need to be addressed. On one hand, the tensionanalysis of the storage need to be exerted. On the other hand, the static and dynamicperformance of the machine tools need to be checked. The study about large frictionwelding machine tools can provide a theoretical basis for the design of largeequipments.(1)The welding process is introduced. For the storage of sheet metal formingstructures, due to its large size and thin-walled features, assembly variation oftenoccurs. There for, the assembly tolerance is expanded by means of process. In order toensure the radial expansion has been in the range of elastic deformation, the radialexpansion needs to be identified.Using software ANSYS to simulate the stress caused by radial tensor, the strainand stress cloud pictures is obtained. The results verify the feasibility of the designmethod.(2)The static and dynamic stiffness of machine tools can affect machiningprecision and service life. What’s more, the efficiency performance is also restricted.Finite element analysis method is adopted to get a better understanding of themachine tools’ stiffness. Thus, the weak link can be determined effectively whichprovides scientific basis for the rational design of machine tools.In order to study the machine tools’ stiffness, the finite element model isestablished based on software Pro/E and ANSYS. Static analysis indicates that theequipment has a high stiffness. On the basis of model analysis, optimal design iscarried out to reduce weight. An improved model based on cell structures and ribtheory is obtained.