| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 102 === In this study, the anti-loosening characteristics of a precision flank locked locknut fabricated under various machining processes and tested in different dynamics environments were investigated. The flank locked locknut has been extensively employed in the spindle and ball screw assembly for modern machine tools. With the machine tools evolve into high speed machining and high precision design. The advancements in spindle and ball screw technologies determine the breakthrough in the machine tools industry.
The axial force ratio and anti-loosening ratio of the flank locked locknut were evaluated using Taguchi method. It was found that the pretension of the flank locked locknut, the pretension, spindle speed, and the temperature condition of the flank locked locknut were the significant control parameters for the anti-loosening performance of the flank locked locknut under dynamics testing. Moreover, the results of the experimental measurements were employed in the regression fit on the performance of the flank locked locknut. The regression model was able to predict the anti-loosening ratio. The optimal design for maximizing the axial force ratio was found to be of: 14700 N pretension, 500 rpm spindle speed, 55 mm2/s oil viscosity, and 60 ˚C temperature. A 28.47% improvement in the axial force ratio was obtained comparing with the initial design having similar specifications. The optimal design for maximizing the anti-loosening ratio was found to be of: 4900N pretension, 500 rpm spindle speed, 55 mm2/s oil viscosity, and 60 ˚C temperature. A 159.3% improvement in the anti-loosening ratio was obtained comparing with the initial design having similar specifications.
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