Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Abstract

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.

Numerical investigation of compressible flow around nose cone with Multi-row disk and multi coolant jets

“…It is observed that the average deviation of our data with other works is less than 6%. Validation of computational studies have been done in several previous works [45][46][47][48][49][50][51][52][53][54][55] Figure 4 displays the flow stream and concentration of the coolant gas (He and CO 2 ) for injection system released from the tip of disk located on the spike. As expected, the formation of the circulations in the cavity is main flow physic of the proposed configurations.…”

A review: studying the effect of graphene nanoparticles on mechanical, physical and thermal properties of polylactic acid polymer

“…Since the fabrication of graphene, which consists of one or more graphite layers with SP 2 allotrope bonds of 2D carbon. 112–117 Due to its excellent properties such as thermal conductivity 117–125 and electrical conductivity, 126–131 high charge density, 132 mobility, 133 optical conductivity 134 and mechanical properties, 135 it has become a unique material. The main building blocks of carbon nanostructures are a graphite layer with SP 2 bonding covalently functionalized carbon atoms in a hexagonal honeycomb network (Fig.…”

“…27,[100][101][102] Some of the important properties of graphene that have been reported so far include large surface to weight ratio (for example, 1 gram of graphene can cover several football elds), approximate elasticity of 1100 GPa, 103,104 fracture toughness of 125 GPa, 103,104 high thermal conductivity and high surface area (2630 m 2 g −1 ) [105][106][107][108][109][110][111] Since the fabrication of graphene, which consists of one or more graphite layers with SP 2 allotrope bonds of 2D carbon. [112][113][114][115][116][117] Due to its excellent properties such as thermal conductivity [117][118][119][120][121][122][123][124][125] and electrical conductivity, [126][127][128][129][130][131] high charge density, 132 mobility, 133 optical conductivity 134 and mechanical properties, 135 it has become a unique material. The main building blocks of carbon nanostructures are a graphite layer with SP 2 bonding covalently functionalized carbon atoms in a hexagonal honeycomb network (Fig.…”

Evaluation of a biosensor-based graphene oxide-DNA nanohybrid for lung cancer

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