Derivation Mechanism of Cyclic Alternating Dynamic Pressures in Linear Hydrodynamic Polishing Flow Fields

doi:10.3969/j.issn.1004-132X.2023.19.002

Abstract

Abstract: Aiming at the periodic polishing flow fields formed between the structured polishing roller and the workpiece surface in LHP， the dynamic pressure action rules of workpiece surfaces were studied in this flow field. The fluid dynamic pressure mathematical model was derived by taking the flow field of the wedge groove rollers as an example based on the hydrodynamic lubrication mechanism， and the global mathematical model of dynamic pressure that was changing with time was established during the LHP processes. The dynamic pressure distribution curve of the flow field was drawn by MATLAB programming language used the global mathematical model and compared with the simulation results of CFD. Furthermore， based on the influences of polishing parameters（polishing rotation speed， polishing gap and polishing slurry concentration）on dynamic pressures and the adjustment effects of workpiece feed speeds on the dynamic pressure periods at different polishing rotation speeds， a derivation mechanism of cyclic alternating dynamic pressures in the LHP flow fields was established to realize the adjustment function of the dynamic pressures and the pressure uniformity on the polished workpiece surfaces.

Key words: , linear hydrodynamic polishing（LHP）, super-smooth surface, fluid dynamic pressure, cyclic alternating characteristic

摘要： 针对线性液动压抛光过程中结构化抛光辊子与抛光工件表面之间形成的周期性流场，研究了该流场中工件表面的动压力作用规律。基于流体动力润滑理论，以楔形槽抛光辊子流场为例推导了工件表面的动压力数学模型，并建立了工件表面动压力随时间变化的全局性数学模型，采用MATLAB语言编程绘制了该全局性数学模型的动压力分布曲线，并与流体力学仿真结果进行了比较验证。基于抛光工艺参数（抛光转速、抛光间隙和抛光液浓度）对动压力幅值的影响，并结合不同转速下工件进给速度对动压力周期的调节作用，建立了线性液动压抛光流场的循环交变动压力衍生机制，实现抛光工件表面动压力大小及其分布均匀性的可调节。

关键词: 线性液动压抛光, 超光滑表面, 流场动压力, 循环交变特性

CLC Number:

TH16
O35

XIE Zhong, WEN Donghui, CHENG Zhichao, KONG Fanzhi. Derivation Mechanism of Cyclic Alternating Dynamic Pressures in Linear Hydrodynamic Polishing Flow Fields[J]. China Mechanical Engineering, 2023, 34(19): 2288-2295.

谢重, 文东辉, 成志超, 孔凡志. 线性液动压抛光流场的循环交变动压力衍生机制[J]. 中国机械工程, 2023, 34(19): 2288-2295.

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