Parametric Analysis And Optimization Of The Hydrodynamic Bar Feeder

The hydrodynamic bar feeder can realize the automatic feeding, which can greatlyimprove the degree of automation and productivity machining process. However, when thebar feeder working, the bar may vibrate, produce bent and deforming. Sometimes thedeformation is very serious, mainly due to the complexity of its structure and the vibrationof machine spindle system. The vibration of the bar in the hydrodynamic bar feederdirectly affects the machining accuracy, and therefore parametric study of thehydrodynamic bar feeder is very necessary.With the bar feeder of the oil bath system as the research object, based on the theoryof fluid dynamic pressure and oil bath system theory of fluid-solid interaction, the affectof bar movement parameters are analyzed, this paper in view of the oil bath feedervibration problem of bar in normal working conditions, and with reference to thesimulation results of feeding tube, the diameter is optimized. The following parts areincluded in this paper:(1) Analysis the structure and working principle of the hydrodynamic bar feeder,confirming the main parameters which may impact on the working status of thehydrodynamic bar feeder.(2) Analysis the hydrodynamic lubrication theory about the hydrodynamic bar feeder,establishing the fluid-solid coupling dynamic model that the rotating bar in the hydraulicoil according to the fluid-solid interaction theory. Finally, analysis the impact of variousparameters on the vibration bar feeder based on the mechanical model which has been gotbefore.(3) Establishing the finite element model about the spindle system, the bar and the oilslick in accordance with the principles of modeling simplified. Getting the bar response ofthe exciting force under dynamic stress response by modal analysis and harmonicresponse analysis. Conducting the fluid-solid interaction analysis which is combined solidtransient dynamics with fluid CFX analysis, and then we can obtain the dynamiccharacteristics of the bar which is rotating in the hydraulic oil. Ultimately, the maximum deflection and its trends of the bar which is under different parameters are obtained.(4) Doing the optimization analysis for the diameter size of the conduit within the barfeeder. Establishing the parametric model in the ANSYS Workbench DesignXplorerenvironment. And then setting the maximum displacement as optimization goal to obtainthe approximate of the optimum. After the optimization solution, the optimal size of theconduit within the bar feeder is obtained.