磨料水射流喷嘴收缩段锥角对磨料粒子混合程度的影响.pdfVIP

2015年 12月 机 床 与 液 压 Dec . 2015 第 43 卷 第 23 期 MACHINETOOL 1 HYDRAULICS Vol. 43 No . 23 D O I : 10.3969/j . issn. 1001-3881. 2015. 23. 017 磨料水射流喷嘴收缩段锥角对磨料粒子混合程度的影响 宋岳干，宋丹路，彭家强 (西南科技大学制造科学与工程学院，四川绵阳621010) 摘要：介绍了磨料水射流的起源、用途、特点及抛光原理，针对混合腔内磨料粒子与高压水束混合不均匀而影响抛光 表面质量及磨料砂管使用寿命的缺陷，通过对磨料水射流切割喷嘴结构的研究，建立了对称双管供料喷嘴几何模型，并运 用 CFD 软件对喷嘴内部流场进行仿真研究，分析了喷嘴收缩段锥角对磨料粒子和高压水束混合均匀程度的影响。研究结果 表明：选择30°和45°的收缩段锥角有利于延长砂管使用寿命及提高磨料粒子与水射流的均匀混合，从而在抛光加工中提高 工件表面质量。 关键词！磨料水射流；喷嘴；流场；磨料粒子；锥角 中图分类号：TP69 文献标志码 ：A 文章编号！ 1001-3881 (2015) 23-065-4 Effects of Cone Angle of Abrasive Water Jet Nozzle Convergent Section on Abrasive Particle Mixing Degree S O N G Yuegan ， SONG D a lu ， PENG Jiaqiang ( College of Manufacturing and Engineering ， Southwest University of Science and Technology ， Mianyang Sichuan 621010, C hina ) Abstract ： The origins ， purpose， features and polishing principle of abrasive water jet were introduced，aiming at defects of pol­ ishing surface quality and service life of the abrasive sand tube when the abrasive particles in the mixing pressure water ， through studying on the cutting nozzle structure of abrasive water je t ， symmetric double feeding nozzle geometry model was established and simulation research on the internal flow field in the nozzle was carried out using the CFDsoftware ，menwhile， the influence of mixing homogeneous degree between nozzle contraction cone angle on the abrasive particles and high pressure water beam was analyzed. The results show that selecting 30° and 45°contraction cone angle is beneficial to extend the service life of sand tube and make abrasive particles mix evenly witli water ret ， according