| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 101 === In this study a hydrostatic slide-way lathe was designed and fabricated, and the characteristic and machining accuracy were investigated. The basal frame of the machine was made of granite; the structure of the table was made of close-looped symmetric hydrostatic slide-way; a restrictor-free, constant flow-rate pumping system was designed to regulate oil supply; and the carriage was driven by a linear motor. The machine was assembles and the static and dynamic properties were performed, and the machining experiments were implemented. Since the theme of this work is to investigate the effect of spindle speed of the precision hydrostatic slide-way lathe on the structure of the machine, therefore the nature frequency was measured using a spectroscope and the data were compared with the analysis results of ANSYS simulation. The result of measurement indicated that the maximum error of simulation was 5.1% in Pitch mode, and the minimum error was 4% in Yaw mode. The linear positioning accuracy and repeatability in X-direction were 1.39μm and 1.28μm respectively, and in Z-direction the positioning accuracy and repeatability were 1.35μm and 1.02μm respectively; a micron scale positioning accuracy was achieved. The horizontal straightness and vertical straightness of the slide-way in X-direction were 19.21μm and 4.21μm respectively, and in Z-direction the horizontal straightness and vertical straightness were 4.36μm and 4.71μm respectively. The result of machining tests on aluminum samples indicated that sub-micron form accuracy was achieved for both planar and spherical specimens.
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