Characteristic Analysis And Topology Optimization Design Of Key Parts Of SZJY - 6 CNC Boring And Milling Machine

With the rapid development of manufacturing industry, it requires a lot of CNC machine equipments, especially for the development of advanced equipment, it requires more precise CNC machine to support, CNC machine is widely used in various aerospace, shipbuilding and automotive equipment manufacturing industry aspect. CNC machine tools main indicators to evaluate static and dynamic characteristics of CNC machine tools in two ways. Static and dynamic performance quality of CNC machine tools will directly affect the machining precision and the stability of CNC machine tools. The accuracy and stability on CNC machine tools mainly reflected in the static and dynamic characteristics of the key parts of CNC machine tools, therefore the static and dynamic analysis of the key part of CNC machine tools to evaluate the accuracy and stability of CNC machine, which is important significance.In this paper, the spindle and headstock of SZJY-6 CNC milling machine as the research object, the spindle and headstock perform static analysis and dynamic analysis, and the structure of the spindle box lightweight design. The main contents include:(1) The establishment of a three-dimensional solid model SZJY-6 CNC milling machine spindle and headstock. Based on the spindle and headstock of the original size, complete constructing three-dimensional solid model of the spindle and headstock by CATIA 3D modeling software.(2) On the spindle and headstock model for reasonable simplification. Without affecting the precision of solutions, and the spindle headstock make a reasonable simplification.(3) Construction of the spindle and headstock finite element model. Import the spindle and headstock to ANSYS Workbench by setting the element, select the mesh manner, meshing the spindle and headstock to complete the build and spindle headstock finite element model.(4) Perform static analysis, modal analysis and harmonic analysis on the spindle, and perform static analysis and modal analysis on the headstock. Obtaining displacements, stresses, six natural frequencies and amplitude-frequency curve of spindle and headstock. The results show that the spindle and headstock has good stiffness, strength and resistance to vibration, and headstock design is too conservative, which need to design the lightweight of the structure of the spindle box.(5) Using of topology optimization methods for headstock structure to optimize the design. Imposing on the headstock optimization by setting the mass as the objective function, cutting force and displacement as the constraints. The results showed that the optimization headstock weight reduce the 9 percent than before. The optimized headstock perform static analysis and modal analysis, by the stiffness, strength and natural frequency of the optimized spindle box contrast to former spindle box to verify the reasonable of the spindle box structure optimization.Above of all, the results show that the spindle and headstock has good stiffness, strength and resistance to vibration by performing the static and dynamic analysis of the spindle and headstock of the SZJY-6 CNC milling machine. Using topology optimization methods to perform the topology optimization of headstock, comparing with the corresponding parameters of former optimization, which results show that decreasing the stiffness, strength and the first natural frequency of headstock optimization, but far from meeting the actual requirements of working conditions, and verifying the reasonableness of headstock optimization, and achieving headstock lightweight design. At the same time, the research methods of the paper provides an important reference value for similar machine.