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Influence of process parameters on average particle speeds in a vibratory finisher

机译：工艺参数对振动抛光机中平均颗粒速度的影响

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摘要

Vibratory finishing (VF) employs vibrationally-fluidized granular media to finish the surfaces of workpieces that are entrained in the flowing media. Its application has been based mostly on experience and trial-and-error due to the complexity of the granular material behavior. The present study used discrete element modeling (DEM) to investigate how the movement of a commercial two-dimensional tub finisher influenced the average particle speed of the media in a bed of smooth, steel, spherical particles, and thus the work that would be done on an entrained workpiece. The parameters governing the tub wall motion (frequency, in-plane amplitudes, and phases of vibration) and the coefficient of friction between the media and the wall were systematically varied in 71 three-dimensional DEM simulations. The average particle speed was affected mostly by the vertical amplitude of tub motion rather than by the frequency, and was mostly independent of other parameters of motion and of the wall friction. A strong relationship was found between the average particle speed and the work done by the wall per cycle of vibration. The normal force on the wall was also found to correlate strongly with the normal component of the wall velocity. Together, these relationships offer the potential to enable the analytical prediction of the average particle speed based on the motion parameters of the tub alone. The paper provides a set of practical guidelines for the control of the average particle speed in VF that are explained by the forces between the media and walls of the tub finisher.
机译：振动精加工（VF）使用振动流化的颗粒介质来精加工夹带在流动介质中的工件表面。由于颗粒材料行为的复杂性，其应用主要基于经验和反复试验。本研究使用离散元素建模（DEM）来研究商用二维浴缸修整机的运动如何影响光滑，钢制，球形颗粒床中介质的平均颗粒速度，从而完成工作在夹带的工件上。在71个三维DEM模拟中，系统地控制了控制桶壁运动的参数（频率，平面内振幅和振动相位）以及介质与壁之间的摩擦系数。平均粒子速度主要受桶运动的垂直幅度的影响，而不是受频率的影响，并且主要与运动的其他参数和壁摩擦无关。在平均颗粒速度和每个振动周期的壁功之间发现了很强的关系。还发现壁上的法向力与壁速度的法向分量密切相关。这些关系在一起提供了潜在的潜力，使得能够仅基于盛水桶的运动参数来分析平均颗粒速度。本文为控制VF中的平均颗粒速度提供了一套实用的指导原则，这些指导原则可以通过介质和桶抛光机壁之间的力来解释。

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