Capillary penetration mechanism and machining characteristics of lubricant droplets in electrostatic minimum quantity lubrication (EMQL) grinding

Xu, Xuefeng; Bin, Feng; Huang, Shuiquan; Liu, Zhiqiang; Niu, Chengcheng; Lin, J.S.; Hu, Xiaodong

doi:10.1016/j.jmapro.2019.07.036

Cited by 18 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…friction coefficient (CoF), droplet diameter and wetting angle were observed using EMQL, which improved machinability. Xu et al [12] compared near to dry machining and EMQL techniques for grinding Cr12 die steel based on cutting force, surface roughness, microhardness and grinding ratio. A superior capillary effect and hence better penetration of grinding fluids observed in EMQL resulted in lower cutting force, microhardness, surface roughness with a 24.8% increment in the life of grinding wheel as compared to MQL technique.…”

Section: Introductionmentioning

confidence: 99%

Comparison of machining performance under MQL and ultra-high voltage EMQL conditions based on tribological properties

Shah

Gadkari

Sharma

et al. 2021

Tribology International

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Comparison of machining performance under MQL and ultra-high voltage EMQL conditions based on tribological properties

Shah

Gadkari

Sharma

et al. 2021

Tribology International

View full text Add to dashboard Cite

“…In another case, Xu et al analyzed the dynamic model of capillary infiltration of cutting fluid as follows [238]: where F cap is the capillary driving force, F p is the atmospheric pressure, F visco is the viscous resistance, r is the capillary radius (assumed to be 0.5 × 10 −6 m), γ is the surface tension, η is the dynamic viscosity of the cutting fluid, ν is the instantaneous speed of fluid penetration, and m is the cutting fluid penetration mass. On this basis, the capillary force coefficient can be defined as C = γ cos θ, which can be obtained by substituting it into equation (11) 2πrC…”

Section: Film Formation and Cooling Enhancement Mechanismmentioning

confidence: 99%

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Zhang

et al. 2022

Int. J. Extrem. Manuf.

170

View full text Add to dashboard Cite

Metal cutting fluids in flood condition does not meet the urgent needs of emission cutting and carbon reduction, minimum quantity lubrication (MQL) is an effective alternative to flood lubrication. Nevertheless, the micro-droplets produced by pneumatic atomization MQL have poor infiltration and wetting properties, which cannot fully exert the film-forming and heat transfer performance of lubricant. The unique empowering mechanism of electrostatic atomization can not only solve the above technical bottleneck, but also realize parametric control of the droplets. Previously, the improvement of tool wear and surface integrity of electrostatic atomization have been preliminarily verified by experimental studies. However, the application principle of electrostatic atomization in the manufacturing process is ambiguous, which limits its further development and industrial application. Especially the in-depth understanding of the action mechanism of the high temperature and high pressure contact interface is difficult and meaningful. More importantly, electrostatic atomization-assisted MQL machining has not been systematically reviewed. In this review, firstly, an analysis of the critical devices, common media (nano-biolubricants) and empowering mechanisms is presented. Subsequently, the excellent machining performance of nano-biolubricants was quantitatively evaluated by comparing with flood, revealing its advanced lubrication and heat transfer mechanism. Furtherly, the excellent machining performance was assessed based on the enhanced penetration, infiltration and film formation properties of electrostatic atomization, with a 42.4% reduction in tool wear and a 47% improvement in machined surface Ra compared to pneumatic atomization. Finally, the limitations of current electrostatic atomization and green lubrication technologies are analyzed and the future trends (e.g. new processes and multi-process coupling) are foreseen. The aim of this paper is to provide a comprehensive review and critical assessment of the existing understanding, which can be used by scientists to gain insight into the mechanism of action, the theoretical basis, machining performance and development direction of new electrostatic atomization processes.

show abstract

“…The novel atomizing core structure has a great influence on the atomization performance and droplet dynamic behavior, as discussed above, which will directly influence the tool life and surface quality [2,3,6]. To further study the effect of the atomizing core structure of the twin-fluid nozzle on the machining performance, the STN, NTN, and an improved NTN (INTN, D 0 = 1.2 mm, D 1 = 2.7 mm, L = 2.4 mm) were…”

Section: Machining Performancementioning

confidence: 99%

“…Moreover, with the increasing environmental protection requirements instituted by various governments, the atomization process has attracted scholarly study to overcome environmental problems during the manufacturing process [5]. Recently, various methods, such as minimum quantity lubrication (MQL) [6], atomization-based cutting fluid (ACF) spray [7], and electrostatic atomization lubrication (EAL) [3], have been adopted to improve the surface quality and tool life and decrease cutting fluid consumption. Li et al [8][9][10][11] have carried out a lot of studies on the minimum quantity lubrication and proved that atomization lubrication is an emerging clean and sustainable technique, and this technique can effectively improve machining performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Chen

Gao

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The droplet dynamic behavior of spraying during the manufacturing process affects tool life, cooling, and lubrication. A detailed understanding of droplet dynamic behavior is required to improve the surface quality while reducing the cutting fluid consumption. In this study, quantitative measurements for droplet diameter, number concentration, and axial velocity were carried out through a phase Doppler particle analyzer technique. The droplet characteristic spatial distributions of a standard twin-fluid nozzle (STN) and a novel twin-fluid nozzle (NTN) under different gas-to-liquid mass ratio (GLR) values were analyzed in detail. The results showed that the high-speed internal gas flow of an atomizing core has a significant effect on improving the synergistically enhanced atomization behavior, and more smaller droplets and an increased droplet momentum are easily obtained. Furthermore, a better spatial distribution of atomization characteristics can be achieved under a higher GLR of 4.3%. Furthermore, the effects of the novel atomizing core structural parameters on the droplet mean velocity spatial distribution, droplet turbulence, and root mean square velocity fluctuation were investigated. The results also showed that the improved NTN can effectively improve the spray atomization performance and droplet dynamic characteristics. In addition, comparative studies of the effect of the atomizing core structure on the machining performance were performed. Compared with the STN, the improved NTN achieves a significant reduction in cutting temperature, tool wear, and surface roughness of 17.25%, 33.96%, and 37.83%, respectively, owing to the better droplet dynamic characteristics and spatial distribution of spray atomization characteristics.

show abstract

Capillary penetration mechanism and machining characteristics of lubricant droplets in electrostatic minimum quantity lubrication (EMQL) grinding

Cited by 18 publications

References 19 publications

Comparison of machining performance under MQL and ultra-high voltage EMQL conditions based on tribological properties

Comparison of machining performance under MQL and ultra-high voltage EMQL conditions based on tribological properties

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Contact Info

Product

Resources

About