Thermodynamic simulation and analysis of ball screw feed system for CNC machine tools based on ANSYS
Ball screw is the main transmission mode of feed system of CNC machine tools,and its thermal deformation during the working process is an important factor affecting the machining accura-cy.The heat source,boundary conditions and thermal deformation mechanism of ball screw feed sys-tem are analyzed to improve the calculation accuracy of ANSYS.The initial mesh is optimized based on Hypermesh to establish a thermal-force coupling model for the system.The temperature varia-tions and thermal deformation under each working condition are analyzed by changing the processing parameters such as feed speed,axial load and ambient temperature.The results show that thermal de-formation is proportional to the feed rate,and thermal equilibrium time is inversely proportional to the feed rate.The effects of axial load on thermal deformation are greater than that of feed rate.Choosing an appropriate feed rate to improve machining methods for ball screw can effectively reduce tempera-ture variations and thermal deformation,which is of certain significance for improving machining ac-curacy and extending the service life of CNC machine tools.
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