| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 101 === Ball screw is a kind of accurate actuation component, but with the applications of ball screw in a high speed and higher axial load conditions, components of a high performance ball screw generate friction heat and cause the variation of transmission properties. The topic is become more important and worth to exploring. Friction heat causes the thermal expansion makes the thermal expansion and affect ball tracks changes their size in circumstances. Therefore, thermal displacement occurring at the screw itself will affect precision transmission performance and positioning accuracy greatly. For ensuring the precision of the stable on a tool machine, the various of ambient temperature, heat generated by heat source of machine table, cooling design and thermal displacement researches are needed in order to dominated its basic features.
Kinematical analysis of ball screw and Finite element analysis were used in the study of thermal expansion and thermal distribution after heat is occurred in nut. Then by experimental measurements of temperature and surface strain to compare the validation and use many different sensors to measure signal of transmission performance for impacting analysis. Transmission signals include the screw planning in different experimental conditions as well as under discussion of transmission torque, screw shaft deformation and rigidity of the machine. Results of this study also discusses the main source of heat for the machine between the ball and the nut frictional heat, and heat of friction is caused by the temperature rise associated with positioning screw thermal expansion becomes large and the transmission torque of the main factors, how to effectively reduce the temperature rise in the future to avoid machine design, calibration and positioning will be important to investigate the factor.
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