Abstract
The Z-axis feeding system of large computer numerical control (CNC) gear grinding machine tools generates lots of heat during processing, which leads to tilt and pitch deformation of the Z-axis guideway and reduces the machining accuracy. In view of this situation, a three-dimensional finite element analysis method is proposed to conduct transient thermal-structural coupling analysis of the Z-axis guideway and feeding system. Considering the microscopic contact state on machine tool joint surfaces and using the root mean square measurement method, the fractal parameter is identified and the thermal contact resistance at the joints is calculated. The friction heat on the guideway is calculated and the thermal value of the motor is obtained. Then, the heat generation rate of the bearing and the screw nut is calculated according to the friction torque. The convective heat transfer coefficient is determined according to the Reynolds number and the Nusselt number. The finite element model is established to obtain the finite element simulation results of thermal error. Finally, the experimental platform for measuring the temperature and thermal deformation of the large computer numerical control gear grinding machine tool is set up, and the accuracy and reliability of the method is verified.
Highlights
Large computer numerical control (CNC) gear grinding machine tool is mainly used to process large and high-precision gears in the fields of aviation, ships, wind power, engineering machinery, and so on.[1]
The machine tools will generate a lot of heat due to working for a long time; because the gears with large size work for a long time, the machine tools generate a lot of heat and result in the thermal deformation of lathe bed, column, guideway, spindle, and other major components
In order to reveal the laws of this thermal deformation of large CNC gear grinding machine tools and improve machining accuracy, it is necessary to conduct
Summary
Large computer numerical control (CNC) gear grinding machine tool is mainly used to process large and high-precision gears in the fields of aviation, ships, wind power, engineering machinery, and so on.[1]. Keywords Thermal deformation, Z-axis guideway, finite element analysis, thermal contact resistance, fractal theory
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