Design and Processing Research of Dynamic Pressure Assisted Non-Newtonian Fluid Polishing Tools

doi:10.3969/j.issn.1004-132X.2023.23.004

Abstract

Abstract: To overcome the problems of low and uneven material removal rate when polishing with NNFL, the design and processing research of dynamic pressure assisted non-Newtonian fluid polishing tools(DNNFTs) were carried out. The DNNFT was designed by adding the pressure-controllable center-int to form a dynamic pressure film. The mechanics properties of the filling material Silly-putty were analyzed, numerical simulation of NNFL fixed point polishing was carried out. The influences of liquid supply pressure on the dynamic pressure field, total pressure field and velocity field of liquid film in the processing area of DNNFT were analyzed based on FLUENT. The material removal function models were constructed based on Preston material removal principle. The polishing process experiments were carried out on 304 stainless steel workpieces. It is concluded that the material removal rate and uniformity may be effectively improved by adding the pressure-controllable center-int. The smallest value of surface roughness(Ra=19 nm) and the best material removal rate(2.431 mg/min) are obtained when the liquid pressure is as 0.8 MPa, the rotational speed is as 1200 r/min and the feed rate is as 6 mm/s. The results prove that DNNFT effectively improves the quality and efficiency of polishing, and improves the uniformity of material removal.

Key words: non-Newtonian fluid lap(NNFL), hydrodynamic pressure, material removal rate, surface quality

摘要： 针对非牛顿流体磨盘抛光材料去除率较低且不均匀的问题，开展动压辅助非牛顿流体抛光工具设计与工艺研究。通过增加压力可控的中心供液，形成动压液膜，实现动压辅助非牛顿流体抛光工具设计；分析填充材料Silly-putty力学特性，对传统磨盘抛光工况进行数值仿真；基于FLUENT分析动压辅助后抛光工具供液压力对加工区域液膜动压场、总压场和速度场的影响；基于Preston假设构建材料去除函数模型。对304不锈钢工件展开抛光工艺验证实验，结果表明：通过压力可控中心供液，可有效提高材料去除率及其均匀性；当供液压力为0.8 MPa、转速为1200 r/min、进给速度为6 mm/s时可获得最佳表面粗糙度（Ra=19 nm）和材料去除率（2.431 mg/min）。实验结果证明，动压辅助非牛顿流体抛光工具可有效提高抛光质量与效率，改善材料去除均匀性。

关键词: 非牛顿流体磨盘, 流体动压, 材料去除率, 表面质量

CLC Number:

TP182

ZHANG Qicong, JIANG Chen, YE Hui, SHEN Lingxin, JIAO Mengdie. Design and Processing Research of Dynamic Pressure Assisted Non-Newtonian Fluid Polishing Tools[J]. China Mechanical Engineering, 2023, 34(23): 2805-2811，2823.

张其聪, 姜晨, 叶卉, 申岭鑫, 矫梦蝶. 动压辅助非牛顿流体抛光工具设计与工艺研究[J]. 中国机械工程, 2023, 34(23): 2805-2811，2823.

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