Sustainability Assessment of Advanced Machining Technologies

Sterle, Luka; Grguraš, Damir; Kern, Matjaž; Pušavec, Franci

doi:10.5545/sv-jme.2019.6351

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…On the other hand, tool life travel path was shorter (L f = 28.0 m) when the mixture of LCO 2 and polar oil was used. Furthermore, transition from conventional flood lubrication to LCO 2 assisted machining, if the nonpolar oil (oil 2) is used in pre-mixed LCO 2 + MQL, reflects in 44.7 % lower running costs, as the tool life is significantly prolonged (conventional flood lubrication; L f = 13.6 m and LCO 2 assisted machining; L f = 36.6 m) [16].…”

Section: Methodsmentioning

confidence: 99%

Media Flow Analysis of Single-Channel Pre-Mixed Liquid CO2 and MQL in Sustainable Machining

Grguraš

Sterle

Malneršič

et al. 2021

SV-JME

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Single-channel supply of pre-mixed liquid carbon dioxide (LCO2) and minimum quantity lubrication (MQL) represents a state-of-the-art LCO2 assisted machining. However, to fully understand and optimize cooling and lubrication provided by the LCO2 + MQL, a fundamental media flow analysis is essential, yet not researched enough. Therefore, in this paper, media flow velocity and oil droplet size were analysed in supplying line and at the nozzle outlet using high-speed camera and proprietary single-channel system. Results indicate that pre-mixed media flow velocity is mainly influenced by the LCO2 expansion rate upon the nozzle outlet, wherein oil droplet size is largely dependent on the solubility between oil and LCO2. Media flow velocity increases significantly from an average of 40 m/s in the supplying line to the excess of 90 m/s at the nozzle outlet due to the pressure drop and LCO2 expansion. Furthermore, this volume expansion causes the oil droplet to increase to the point of critical, unstable droplet size. Afterward, the unstable oil droplet breaks up into smaller oil droplets. It was found, that nonpolar oil, with greater solubility in LCO2, compared to the polar oil, provides droplets as small as 2 μm in diameter. Smaller oil droplets positively reflect on tool wear and tool life in LCO2 assisted machining, as the longest tool life was achieved by using the nonpolar oil for pre-mixed LCO2 + MQL.

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Section: Methodsmentioning

confidence: 99%

Media Flow Analysis of Single-Channel Pre-Mixed Liquid CO2 and MQL in Sustainable Machining

Grguraš

Sterle

Malneršič

et al. 2021

SV-JME

Self Cite

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“…Sterle et al analyzed the pulsating HP CF supply strategy in comparison to HP CF supply and cryogenic machining concerning economic and ecological aspects [27]. Turning experiments in Inconel 718 with pulsating HP CF supply were carried out with a feed f = 0.28 mm, a cutting speed v c = 50 m/min, and a depth of cut a p = 0.5 mm.…”

Section: State Of the Artmentioning

confidence: 99%

“…In summary, the pulsating HP CF supply was identified as a suitable technology to achieve chip breakage during finish turning of Inconel 718 by Bergs et al and Sterle et al [14,[25][26][27]. Bergs identified basic correlations between the cutting parameters, the pulsation parameters, and the resulting chip length l s [25].…”

Section: State Of the Artmentioning

confidence: 99%

Influence of the frequency of pulsating high-pressure cutting fluid jets on the resulting chip length and surface finish

Splettstoesser

Schraknepper

Bergs

2021

Int J Adv Manuf Technol

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High-pressure cutting fluid supply is a proven technology for chip breaking when turning difficult-to-cut materials, such as Inconel 718. However, the technology is usually not suitable for the finish turning of safety-critical parts in aero engines. The acting force of the cutting fluid jet on the back of the chip causes chip breaking. The broken chips are then accelerated by the cutting fluid jet towards the workpiece surfaces where they cause damage on impact. One approach to minimize surface damage is a specific increase in the chip length. The center of gravity of the chips with an adjusted length is shifted out of the focus where the cutting fluid jet hits the chips. Hence, the already finished surface is subjected to fewer impacts of the chips. In this study, the adjustment of the chip length by pulsating high-pressure cutting fluid supply to prevent surface damage was investigated. A valve unit was used to generate two alternating cutting fluid supply pressure levels in certain time intervals. During the low-pressure stage, the force of the cutting fluid jet does not lead to chip breakage and the chip length increases until the valves switch and the high-pressure stage is released. The focus of this work was the analysis of the relationship between the duration of the low-pressure and high-pressure time intervals and the chip length. Additionally, the influence of the depth of cut, the feed, and the cutting speed on the chip length during pulsating high-pressure cutting fluid supply was investigated. Finally, a case study was carried out to evaluate the effectiveness of the pulsating high-pressure cutting fluid supply technology. Therefore, the shoulder surface of a demonstrator part was finished by face turning. Following, the cylindrical surface was finished with a continuous and pulsating high-pressure cutting fluid supply with varied supply parameters. Microscopic analyses of the surface prove that the pulsating high-pressure cutting fluid supply prevents the surface from being damaged by the impacts of chips.

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Media-Assisted Machining Processes

Grzesik

Ruszaj

2021

Springer Series in Advanced Manufacturing

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Sustainability Assessment of Advanced Machining Technologies

Cited by 4 publications

References 26 publications

Media Flow Analysis of Single-Channel Pre-Mixed Liquid CO2 and MQL in Sustainable Machining

Media Flow Analysis of Single-Channel Pre-Mixed Liquid CO2 and MQL in Sustainable Machining

Influence of the frequency of pulsating high-pressure cutting fluid jets on the resulting chip length and surface finish

Media-Assisted Machining Processes

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