A polishing method using self‑excited oscillation abrasive flow for the inner surface of workpiece
A polishing method using self‑excited oscillation abrasive flow for the inner surface of workpiece
复制标题
一种自激振荡磨粒流工件内表面抛光方法
DOI：
10.1007/s00170-021-08195-9
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发表时间：
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通讯作者：
Huizon Lu
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作者：
Qianfa DENG;Yangxiao WANG;Lizhi SUN;Binghai LYU;Julong Yuan;Ping Zhao;Chenxi Guo;Huizon Lu
为了更好地抛光管件和孔类零件的内表面，提出了一种基于磨料流自激振荡脉冲效应的抛光新方法。首先介绍了自激振荡抛光的基本原理，然后建立了自激振荡磨料流抛光的仿真模型和实验平台。通过流体模拟和不锈钢内表面抛光实验，分析了抛光参数(进口速度、进口初始压力、磨料浓度、磨料粒度)、湍流强度和壁面剪切力之间的关系。实验结果表明，影响粗糙度变化的因素从大到小依次为入口速度、入口初始压力、磨料浓度和磨料粒度。此外，还进行了抛光对比实验。在入口处A处，未加振荡腔的情况下，抛光14小时后，内表面粗糙度为46 nm，而在自激振荡腔的情况下，抛光12小时后，内表面粗糙度为46 nm。与无振荡磨料流抛光相比，自振荡磨料流抛光效率提高15%，并能抑制过抛光现象。
To better polish the inner surface of the pipe fittings and hole parts, this paper proposed a novel polishing method that was based on the self-excited oscillating pulse effect of abrasives flow. Firstly, the basic principle of self-excited oscillating polishing flow was introduced, and then the simulation model and experimental platform of a self-excited oscillating abrasive flow polishing were established. Through fluid simulation and stainless steel inner surface polishing experiments, the relationships between polishing parameters (inlet velocity, inlet initial gauge pressure, abrasive particle concentration, and abrasive particle size), turbulence intensity, and wall shear forces were analyzed. The results of experiments showed that the factors affecting the variation of roughness are sorted from large to small into inlet velocity, inlet initial gauge pressure, abrasive particle concentration, and abrasive particle size. In addition, A polishing comparison experiment was carried out. At the inlet A, the inner surface roughnessRacan reach 46 nm after 14 h of polishing without an oscillation cavity, while in the case of a self-excited oscillation cavity, the inner surface roughnessRacan reach 46 nm after 12 h of polishing. Compared with the non-oscillating abrasive flow polishing, the polishing efficiency with the self-oscillating abrasive flow is 15% higher, and the over-polishing phenomenon can be suppressed.