| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 89 === The purpose of this study is to perform the kinematic design of a pot up-down mechanism in the machining center.The pot up-down mechanism consists of three sub-mechanism：RPRR mechanism, translating roller follower cam mechanism, and PPRR mechanism. Based on the analysis of an existing pot up-down, the design requirements and constraints are concluded. For the RPRR mechanism, the dimension of linkage is synthesized such that the transmission angle of linkage at two limit positions of the rocker are equal. For the dwell-rise-dwell cam mechanism, the MS、MT, and MCV curves are applied to synthesize cam profile with better pressure angle and kinematic properties. The required force for the actuator is then determined by the kinetostatics analysis of the pot up-down mechanism. The synthesized mechanism is better than the existing one in transmission angle, pressure angle, driving force, and kinematic properties.
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