• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (3): 169-177.doi: 10.3901/JME.2018.03.169

• 制造工艺与装备 • 上一篇    下一篇

MQL条件下的油滴覆盖率及尺寸分布研究

张松1,2, 张成良3, 石文浩1,2, 吕盈1,2, 陈杰1,2   

  1. 1. 山东大学机械工程学院 济南 250061;
    2. 山东大学高效洁净机械制造教育部重点实验室 济南 250061;
    3. 中车长春轨道客车股份有限公司 长春 130062
  • 收稿日期:2017-03-15 修回日期:2017-06-18 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: 张松(通信作者),男,1969年出生,教授。主要研究方向为高效切削机理及加工表面完整性等。E-mail:zhangsong@sdu.edu.cn
  • 作者简介:张成良,男,1990年出生,硕士。主要研究方向为高效切削加工技术。E-mail:zhangchengliang01@126.com;石文浩,男,1991年出生,硕士研究生。主要研究方向为高效切削加工技术。E-mail:seven7hao@foxmail.com;吕盈,女,1989年出生,硕士研究生。主要研究方向为高效切削加工技术。E-mail:lvying20140906@163.com;陈杰,男,1993年出生,硕士研究生。主要研究方向为高效切削加工技术。E-mail:1220242893@qq.com
  • 基金资助:
    国家自然科学基金(51575321,51175309)和山东省泰山学者工程专项经费资助项目。

Investigation of Oil Droplet Coverage Rate and Droplet Size Distribution under Minimum Quantity Lubrication Condition

ZHANG Song1,2, ZHANG Chengliang3, SHI Wenhao1,2, LÜ Ying1,2, CHEN Jie1,2   

  1. 1. School of Mechanical Engineering, Shandong University, Jinan 250061;
    2. Key Laboratory of High-Efficiency and Clean Mechanical Manufacture Shandong University, Ministry of Education, Jinan 250061;
    3. CRRC Changchun Railway Vehicles Co., LTD., Changchun 130062
  • Received:2017-03-15 Revised:2017-06-18 Online:2018-02-05 Published:2018-02-05

摘要: 微量润滑(Minimum quantity lubrication,MQL)切削过程中,刀具-切屑界面和刀具-工件界面的油滴覆盖率、油滴大小及其尺寸分布是决定切削区油膜均匀性和覆盖面积大小的重要因素,进而直接影响微量切削油的润滑性能。针对不同喷射距离和气体流量下的油滴覆盖率、油滴大小及其尺寸分布进行研究。借助于图像处理技术,获得不同喷射距离和气体流量下的油滴位图,分析油滴形状以及喷射距离对油滴覆盖率的影响规律;然后,利用油滴体积计算模型,阐释油滴尺寸分布与气体流量之间的内在关系。研究表明:适当缩短喷射距离和增大气体流量可以提高油滴覆盖率和减少油滴尺寸,进而充分发挥MQL技术的润滑性能。

关键词: 润滑油膜, 微量润滑(MQL), 油滴尺寸分布, 油滴覆盖率

Abstract: During minimum quantity lubrication (MQL) cutting processes, the coverage rate of the oil droplet, as well as the droplet size and its distribution at the tool-chip and tool-workpiece interfaces are the important factors influencing the oil film uniformity and oil coverage area at the cutting zone, which then directly determine the lubricating performance of the lubrication oil. The coverage rate of the oil droplet is investigated, as well as the droplet size and its distribution under different spray distance and air flow rate. First, by means of image processing technology, the bitmap images of the oil droplets under different spray distance and air flow rate are obtained, and the effects of droplet shape and spray distance on the coverage rate of the oil droplet is analyzed. Then, the relationship between the oil droplet size distribution and the air flow rate are explored by aid of the mathematic model of the oil droplet volume. The results indicate that the combination of properly shortening the spray distance and increasing the air flow rate is benefit to increasing the coverage rate of the oil droplet, and reducing the droplet size, and then improving the lubrication performance of MQL technology.

Key words: droplet size distribution, lubrication oil film, minimum quantity lubrication (MQL), oil droplet coverage rate

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