Mechanism of Electrostatic Atomization and Surface Quality Evaluation of 7075 Aluminum Alloy under Electrostatic Minimum Quantity Lubrication Milling

被引：0
|
作者：
Wu X.-F. [1 ]
Xu W.-H. [1 ]
Ma H. [1 ]
Zhou Z.-M. [2 ]
Liu B. [3 ]
Cui X. [1 ]
Li C.-H. [1 ]
机构：
[1] School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong, Qingdao
[2] Hanergy (Qingdao) Lubrication Technology Co., Ltd., Shandong, Qingdao
[3] Sichuan Future Aerospace Industry Co., Ltd., Sichuan, Shifang
来源：
Surface Technology | 2023年 / 52卷 / 06期
基金：
中国国家自然科学基金;
关键词：
7075 aluminum alloy; airflow field; electrostatic atomization minimum quantity lubrication; milling; nozzle position; surface quality;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.06.030
中图分类号：
学科分类号：
摘要：
In order to solve the technical problems of poor atomization performance, high environmental aerosol concentration and poor parameterization controllability of traditional pneumatic atomization minimum quantity lubrication milling, an electrostatic atomization minimum quantity lubrication milling supply system has been designed. The work aims to study the airflow field at the constrained interface of tool-workpiece, analyze the mechanism of electrostatic minimum quantity lubrication (EMQL) and evaluate the milling surface quality of 7075 aluminum alloy. The airflow field distribution at the constrained interface of the tool-workpiece was analyzed to theoretically model the velocity distribution of the vortex in the airflow field. The optimal jet position of the nozzle was established based on the kinetic characteristics of the circumferential vortex and the incoming vortex. Then, the charging and atomization mechanism of EMQL were studied. On this basis, milling experiments were carried out to 7075 aluminum alloy under different lubrication conditions, including dry, flood and EMQL. Milling force and milling surface roughness (Ra, Rsm) under the different lubrication conditions were measured. In addition, autocorrelation analysis of the machined surface profiles obtained by EMQL under both parameter conditions was performed. Finally, the mechanism of the charged lubricant in the cutting zone was analyzed. Under the experimental milling parameters, when the induced radius rγ was 0.007 m, the optimal position parameters were set to lz=9.7 mm (distance from the jet point to the workpiece surface), ly=11.5 mm (distance from the jet point to the edge of the milling too) and γ≈40° (included angle between the nozzle and the workpiece in the horizontal direction). Compared with dry milling, EMQL could reduce milling force by 15% and 18.6%. In addition, compared with dry milling, the Ra and Rsm obtained by EMQL under the condition of 30 kV decreased by 15.5% and 25% respectively. Compared with that at 20 kV, the autocorrelation analysis curve of the surface profile of EMQL milling at 30 kV showed better surface quality. The best surface quality (Ra=0.221 μm, Rsm=0.037 μm) was obtained under flood lubrication. The charged droplets can enhance the capillary penetration performance at friction interface and the capillary penetration length can be increased under the condition of increasing voltage. EMQL under high voltage shows better milling performance than that under low voltage. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
引用
收藏
页码：337 / 350
页数：13
相关论文
共 35 条
  • [1] JING Lu, NIU Qiu-lin, DANG Jia-qiang, Et al., Milling Performance Evaluation and Cooling/Lubrication Mechanism of Al-50wt% Si Alloy Based on Various Environmentally Sustainable Manufacturing Strategies, The International Journal of Advanced Manufacturing Technology, 122, 2, pp. 1023-1040, (2022)
  • [2] LIN Sen, PENG Fang-yu, WEN Jie, Et al., An Investigation of Workpiece Temperature Variation in End Milling Considering Flank Rubbing Effect, International Journal of Machine Tools and Manufacture, 73, pp. 71-86, (2013)
  • [3] LIU Nian-cong, ZOU Xing, YUAN Jia, Et al., Performance Evaluation of Castor Oil-Ethanol Blended Coolant under Minimum Quantity Lubrication Turning of Difficult-to-Machine Materials, Journal of Manufacturing Processes, 58, pp. 1-10, (2020)
  • [4] GAO Teng, LI Chang-he, ZHANG Yan-bin, Et al., Mechanical Behavior of Material Removal and Predictive Force Model for CFRP Grinding Using Nano Reinforced Biological Lubricant, Journal of Mechanical Engineering, (2022)
  • [5] LIU Ming-zheng, LI Chang-he, CAO Hua-jun, Et al., Research Progresses and Applications of CMQL Machining Technology, China Mechanical Engineering, 33, 5, pp. 529-550, (2022)
  • [6] ZHANG Yan-bin, LI Hao-nan, LI Chang-he, Et al., Nano-Enhanced Biolubricant in Sustainable Manufacturing: from Processability to Mechanisms, Friction, 10, 6, pp. 803-841, (2022)
  • [7] HUANG Shui-quan, LI Zhong-ya, YAO Wei-qiang, Et al., Tribological Performance of Charged Vegetable Lubricants, Tribology, 34, 4, pp. 371-378, (2014)
  • [8] KHAN M M A, MITHU M A H, DHAR N R., Effects of Minimum Quantity Lubrication on Turning AISI 9310 Alloy Steel Using Vegetable Oil-Based Cutting Fluid, Journal of Materials Processing Technology, 209, 15, pp. 5573-5583, (2009)
  • [9] SHI Zhuang, GUO Shu-ming, LIU Hong-jun, Et al., Experimental Evaluation of Minimum Quantity Lubrication of Biological Lubricant on Grinding Properties of GH4169 Nickel-Base Alloy, Surface Technology, 50, 12, pp. 71-84, (2021)
  • [10] XU Wen-hao, LI Chang-he, ZHANG Yan-bin, Et al., Electrostatic Atomization Minimum Quantity Lubrication Machining: From Mechanism to Application, International Journal of Extreme Manufacturing, 4, 4, (2022)
1234