Finite Element Analysis And Optimized Research On Bed Structure Of NC Lathe

NC lathe in the modern manufacturing industry has been widely applied. The optimized research on NC lathe to make it towards the development direction of high speed and high precision is extremely necessary. It is very urgent that adopting a virtual simulation optimization technique which is based on the method of both finite element method and mathematical optimization theory combined. This method has the ability of simulating machine’s performance and working conditions in computer before prototype development by making use of the technology mentioned above. Simulating results can help to identify the weak links of the prototype and make a foundation for further optimized design.With a NC lathe bed as the research object in this thesis, to discuss the application of both finite element analysis and mathematical optimization in the structural analysis and optimized design on lathe bed. It mainly includes the following contents:1.In this thesis, summarize the development and present situation of finite element analysis and optimized design which are correlative with mechanical structure in the domestic and foreign, state the target and values of the thesis, and indicate the chief research contents of it.2.According to the design drawings, three sorts of design schemes of3D structural model are established in Pro/E. On this basis, strength analysis is carried out in a scientific way, and a finite element model of lathe bed is rationally established. Both static analysis and modal analysis on lathe bed are performed by using ANSYS Workbench Environment(AWE) which is a software of finite element analysis. In the light of the results of analysis, to select a design scheme which comprehensive performance is good. Then, based on the selective design, doing harmonic response analysis, the curve of the frequency response-deformation for bed structure under the action of harmonic cutting force is obtained. On the basis of above analysis, finding out the weak links of the body structure, to determine where is in need of improvement, which points out direction for subsequent optimization.3.Establish a CAE model for bed structure in a parametric manner, assign five main dimensions of the internal body as the design variables, next set up conditions of strength, stiffness and quality as constraints function, then select its fundamental frequency as objective function, finally build a mathematical model of optimization. In the end, the lathe bed’s performance is improved effectively after optimization.4.Variational design technology for mechanical structure is concisely reviewed and applied to optimize unit structure of the bed structure. The main content is to decide how to open hole in bed plate with respect to shape and quantity, which could provide reason for the optimization of lathe bed.5.The final structure format is achieved by means of optimization results analyzed and compared.The research work in this thesis is of great value for lathe bed’s design, improvement and optimization.