The Structural Analysis And Optimization Of The XK2423CNC Milling Machine Based On Finite Element Method

CNC milling machine is the carrier of advanced manufacturing technology and the important base of manufacturing industry and the national economy. It is an important expression of national manufacturing technology development level and the degree of modernization of the manufacturing industry. The traditional design method of analogy and experience have less and less able to meet the increasingly growing performance, dynamic and static stiffness, the cost and appearance requirements of the machine. So the introduction of the finite element analysis and more sophisticated, accurate structural optimization design method of sizing and topology optimization is particularly important in the design of the machine.The dissertation take the example of the beam and column of a model CNC milling machine, Based on the finite element technology, using the finite element software HyperWorks to establish the mechanical model of them, and make theirs static and dynamic performance analysis to gain theirs static and dynamic parameter, by comparing these parameters with machine performance requirements to identify weaknesses, and then, make structural optimization design of the columns and beams, shorten the product development cycle and reduce the cost and improve the machine’s overall performance.In this dissertation, combing with the structural design and optimization of XK2423CNC gantry milling machine and key components, mainly to complete the following work:①established the three-dimensional model of XK2423CNC milling machine beam, columns and the complete machine, on this basis, through reasonable simplification, equivalent to establish a finite element model of the machine, laid the foundation for the subsequent structural analysis and optimization;②The key components beams and columns of the machine tool are analyzed in dynamic and static characteristics, obtained the deformation and stress distribution under the gravitational force and actual load conditions, the former sixth-order modal of the beams and columns were extracted, got its natural frequencies and corresponding vibration mode, provide the basis for subsequent structure optimization;③the topology optimization of the beam and column were made by variable density method, obtained the optimal material distribution of the beams and columns structure, on the basis, the best combination of size parameters of beams and columns structural were got by size optimization, the optimized structure and the former were analyzed and compared. The analysis results indicate that static stiffness of the improved beam is increased by20%, the mass reduced by7.5%under condition of dynamic stiffness is constant; under condition of the mass of the column reduced by4.5%, the static stiffness increased by16%, the first order frequency is increased from83.5Hz to87.6Hz;④Make the static and dynamic analysis of the whole machine and compare the result with performance indicator provided by the machine tool plant. The result shows that XK2423CNC milling machine designed to fully meet the performance requirementsIn this dissertation, the static and dynamic characteristics analysis of the XK2423CNC milling machine structure and topology optimization and size optimization of key components research can provide an effective reference to the practical engineering design.