| It is well known that the nuclear is a sustainable energy which avoid the constrain ofenergy in the development of the productive force. The tube support plates is an importantcomponent of the steam generator in nuclear power industry which needs high positionalaccuracy in drilling. Drilling is one of the most fundamental machining operations whichrelated to vibration. This thesis launched on the vibration in drilling of tube support plates,have a research on the various factors which affect it, build the finite element responseprediction model and validates through experiments. The main contents are as follows:Firstly, a comprehensive analysis was given to the multi-axis drilling system inGuangzhou DFHM to study the influence of clamping system and tool system onvibration during the drilling and then provided a experimental scheme. A clamping systemwas designed and an experiment system on the WZ ZK5540A CNC machining center wasset up.Secondly, in order to obtain a relative high accuracy in cutting parameters, for havinga study on the relationship between cutting parameters and drilling force,experimentswere completed, and a model to predict the drill force was established. Besides, the FEAmodel of drilling system was built, and the deviation of natural frequency is less than10%.For predicting the vibration response in drilling, a virbation response prediction modelbased on FEA model was established.Finally, through a comparative analysis, the appropriate monitoring signal waschoosen. Experiment on the influence of time sequence of the two spindles was completedthrough the study of two spindles drilling at the same time. At last, the influence of cuttingparameter on monitoring signal was analyzed, and the optimization of cutting parameterwas done through experiments on the vibration amplitude and surface roughness and theeffectiveness of optimization on cutting parameters was verified in the finite elementmodel. |
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