Solid lubricants in machining

Krishna, P. Radha; Srikant, R. R.; Rao, D. Nageswara

doi:10.1177/1350650111398172

Cited by 43 publications

(27 citation statements)

References 22 publications

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“…This can be attributed to the ability that with an increase in feed and depth of cut, the rate of plastic deformation in the primary shearing zone increases. 23…”

Section: Resultsmentioning

confidence: 99%

“…18 To achieve better performance in terms of improved tool wear and surface roughness, solid lubricants need to be supplied effectively at the tool-chip interface. [19][20][21][22][23] Solid lubricants are also attractive in promoting dry machining, an environment-friendly process. 24 Solid lubricant additives with layered structure have been extensively studied, and excellent machining performance has been observed in terms of improved tool life and surface finish.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic high-velocity solid lubricant machining system for performance improvement of turning Ti–6Al–4V alloy

Gunda

Narala

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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In any machining operation, a major division of energy is converted into heat which creates detrimental effects on tool wear, tool life and surface quality of machined work material. Effective cooling/lubrication in the machining zone is essential to improve friction and temperatures by efficient heat dissipation which increases tool life and surface quality. But adverse health effects caused by use of flood cooling are drawing manufacturers’ attention to develop methods for controlling occupational exposure to cutting fluids. In demanding the improvement of productivity and product quality of machining, use of solid lubricant thin film was suggested as one of the necessary alternative machining techniques to apply lubricants effectively to the high-temperature zone. There is a general concern in the machining process in terms of applying lubricants effectively to the machining zone. Therefore, this research work contributes to the development of a novel approach to apply lubricants effectively to the rake face and flank face of the cutting tool without polluting the environment. Electrostatic high-velocity solid lubricant assisted machining is a novel technique used in the machining process with a very low flow rate (1–20 mL/h) to enhance the process performance of turning difficult-to-cut materials. The performance of electrostatic high-velocity solid lubricant technique is studied in comparison to minimum quantity solid lubricant, minimum quantity lubricant and dry and wet (flood cooling) to assess the performance considering surface roughness, cutting force and tool wear as performance indices. The experimental results revealed that electrostatic high-velocity solid lubricant with MoS2 solid lubricant at low volume and constant flow rate has observed high potential to apply lubricants effectively in the machining zone when compared with the considered environmental conditions. This work is expected to form a scientific basis toward developing electrostatic high-velocity solid lubricant technique for reducing the manufacturing impact in the machining of aerospace components such as Ti–6Al–4V alloy in terms of both machinability and environmental perspectives.

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“…This can be attributed to the ability that with an increase in feed and depth of cut, the rate of plastic deformation in the primary shearing zone increases. 23…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrostatic high-velocity solid lubricant machining system for performance improvement of turning Ti–6Al–4V alloy

Gunda

Narala

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The addition of such solid lubricant to a tribological contact reduces friction and wear effectively by preventing adhesion, enabling tribo-chemical reactions, and offering a low shear strength [47]. Consequently, calcium fluoride has been used to improve the tribological properties of self-lubricating composites widely used in automotive industries, aviation, and electronic devices [47], or even to improve the performance of machining processes [48]. In this study, the immersion of cp-Ti samples in AS containing NaF involved the precipitation of calcium fluoride (or like) salts (Fig.…”

Section: Fluoride Influence On Titanium Tribocorrosionmentioning

confidence: 99%

Combined Influence of Fluoride and Biofilms on the Biotribocorrosion Behavior of Titanium Used for Dental Applications

et al. 2015

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Dental implant failures occur mainly due to biofilm infections and mastication micro-movements or load stresses that may induce wear degradation. Dental implants' microgaps are highly susceptible areas for biofilm formation and fluoride retention. Although fluoride is an antimicrobial agent widely used in caries prevention, its influence on biofilms under sliding wear remains unknown. The main aim of this work was to assess the effect of mixed biofilms and fluoride on the tribocorrosion behavior of titanium. Streptococcus mutans and Candida albicans mixed biofilms were cultured for 8 days on ground and polished commercially pure titanium. Biofilms' formation was influenced by topography: higher roughness surfaces presented higher levels of biomass. Reciprocating sliding tests were performed on both surfaces, with and without biofilms, immersed in artificial saliva in the absence or presence of fluoride (30 and 227 ppm F -). The low friction coefficient registered indicated the lubricating effect of biofilms on titanium surfaces. Fluoride was also found to have lubricating properties on titanium during sliding, probably due to the precipitation of calcium fluoride (or like) salts. The presence of fluoride influenced the biotribological behavior of titanium surfaces covered with biofilms, facilitating their structural disruption and detachment. Nevertheless, open circuit potential tests reduced the corrosion of titanium in the presence of fluoride (227 ppm F -) and biofilms. In conclusion, it is highlighted that fluoride interaction with biofilms can significantly influence the tribological properties of commercially pure titanium in the oral cavity.

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“…13 Solid lubricants which are also called as dry lubricants are used as solid powder material or mixture of oil to reduce friction between tool–workmaterial sliding interface. 14 A sufficient and more droplet transfer rate of coolants and lubricants with extended adhesion time is required for a high-temperature cutting region in which the applied thin lubricant films reduce the tool wear and improving surface quality of the workpiece. 15–18…”

Section: Introductionmentioning

confidence: 99%

Analysis of electrostatic solid lubricant spray process parameters during turning Ti-6Al-4V alloy

Gunda¹,

Narala

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Titanium alloys are considered as hard-to-cut material due to its relatively high resistance to corrosion, low thermal conductivity and high chemical reactivity. Effective penetration of sufficient amount of lubricant in the metalworking process is of utmost importance to (a) reduce frictional resistance at the high-temperature tool–workpiece interface and (b) avert the formation of built-up edge in machining process. Traditionally, the lubricant forms a thin fluid film to reduce the friction. In order to reduce or eliminate coolant usage and to apply lubri-coolant efficiently at tool–chip–workpiece interface, a novel near-dry machining technique called electrostatic charged solid lubricant spray system has been developed. In electrostatic charged solid lubricant spray technique, the aerosolized micro-droplet particles were sprayed from the nozzle tip which uses a phenomenon called contact-charge electrification principle. The quick penetration and wettability of charged atomized droplet particles are impinged with high velocity at the tool–chip interface. The focus of the present experimental research is to analyse the optimum lubrication process parameters of the experimental set-up in terms of effectively applying cutting fluid in the machining zone. The study shows that the desired atomization and machining performance of the electrostatic charged solid lubricant spray technique can be obtained by governing different spray parameters (lubricant flow rate, air pressure, spray nozzle position, nozzle distance, electrostatic voltage). The results revealed that when the charged lubricants are applied with high velocity and large number of droplets, it will have significant influence on surface roughness and cutting force. The fabricated electrostatic charged solid lubricant spray technique provides us with an efficient and economic machining solution by applying solid lubricants effectively at tool–material interface during turning of Ti-6Al-4V alloy material. The present approach and the obtained results will help in better understanding of the machinability of hard-to-cut materials in manufacturing industries.

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Solid lubricants in machining

Cited by 43 publications

References 22 publications

Electrostatic high-velocity solid lubricant machining system for performance improvement of turning Ti–6Al–4V alloy

Electrostatic high-velocity solid lubricant machining system for performance improvement of turning Ti–6Al–4V alloy

Combined Influence of Fluoride and Biofilms on the Biotribocorrosion Behavior of Titanium Used for Dental Applications

Analysis of electrostatic solid lubricant spray process parameters during turning Ti-6Al-4V alloy

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