Static And Dynamic Characteristics Analysis And Optimization Of Modular Milling Machine Base

In order to solve the problem that large workpieces are not convenient to be placed on the workbench of the machine tool for processing and to deal with the complex processing environment in the cabin,a modular milling machine is designed to be used for on-site plane processing of various types of base planes in the narrow space in the cabin.Taking BXSXC-1800 single-arm modular milling machine as the research object,the finite element analysis software ANSYS Workbench is used to carry out the static and dynamic characteristics analysis and multi-objective optimization design of the base of the important support component of the machine tool,so as to further improve the reliability of the machine tool.The specific research work is as follows:(1)The layout analysis of the combined milling machine and the structural design of the base.According to the field workpiece and processing environment,the overall scheme layout of the milling machine and the main parameters of the design,and detailed design of the base of the main structure,and the base of the manufacturing process and materials were selected.Then through analysis and comparison,the best transmission mode of linear motion mechanism is determined.To improve the reliability of the single-arm milling machine and reduce the manufacturing cost of the base to carry out further research and analysis.(2)Analyze and study the static and dynamic characteristics of the base.Three-dimensional modeling of the base of single-arm gantry milling machine is carried out by Solid Works,and then the model of the base is transferred to ANSYS Workbench to form a finite element model using interface technology.Then the static analysis and modal analysis of the base are carried out respectively.The results show that the deformation of the base meets the design requirements,the maximum stress is far below the strength limit of the material 345 MPa,and the low-order natural frequency is greater than the meshing frequency of the rack and pinion when the motor is working.The harmonic response of the base is analyzed by the modal superposition method,and the results show that the low order natural frequency is more easily excited in the actual machining process,which provides a theoretical basis for the structural optimization.Optimize the structure of the base.The multi-objective optimization design based on AWE response surface method was adopted.Five design variables were selected,and the optimization objectives were to reduce the total deformation,mass and increase the first-order natural frequency of the base.Finally,the optimized results were compared and analyzed.The results show that the deformation and stress are reduced to some extent compared with those before optimization.The first ten order natural frequencies of the base are all improved to some extent compared with those before optimization,among which the first order natural frequency is increased by 49.91 Hz.After optimization,the overall weight of the base is reduced by 41.63 kg,which is about6.25%,and the expected optimization goal is achieved.