Coolant lubricity and coolant-lube compatibility with regard to slideway behavior

Mohan, C.B.; Gopalakrishna, K.; Lohith, K. S. Mahesh; Venkatesh, Krishna; Divakar, C; Mithun, R. B.; Naveen, T.

doi:10.1590/s1678-58782008000400003

Cited by 2 publications

(4 citation statements)

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“…Table 7 shows that the total hardness of the aged CF sample was 19 • dH (339 ppm), whilst the unaged CF sample was 11 • dH (196 ppm). CFs prepared from softer water are more stable taking much longer for the salt and mineral contents to separate out of the emulsion [44]. With low water hardness, foaming can occur, resulting in lower tool life and poor surface finish [45].…”

Section: Chemistrymentioning

confidence: 99%

“…This small droplet size is well below 1.5 µm and more typical of a true solution. The authors of [44] used a linear reciprocating tribometer to show quantitively that lubricity reduces with increasing water hardness of an emulsion CF. Although the contact pressure at 0.3 MPa and velocity range up to 2 m/min in this study were quite low, it could explain the improved lubricity of the unaged CF with lower total hardness.…”

Section: Chemistrymentioning

confidence: 99%

“…The pH of the unaged CF was 9.0, whilst for the aged CF, it was 8.9. Ideally, coolants should have a pH value between 8.8 and 9.2 [44]. For a long-service-life coolant, the pH range should fall between 7 and 9 [48], and the former is neutral, although the range 8.5 to 11 could be acceptable.…”

Section: Microorganism Effectsmentioning

confidence: 99%

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Long Sump Life Effects of a Naturally Aged Bio-Ester Oil Emulsion on Tool Wear in Finish Turning a Ni-Based Superalloy

Wood,

Mantle,

Boud

et al. 2023

Metals

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This paper discusses a method of finish turning Inconel 718 alloy to compare machining performance of a naturally aged and used metalworking fluid (MWF), which had been conventionally managed through its life cycle, with the same new unaged product. The MWF concentrate was a new-to-market bio-ester oil, diluted with water to produce an emulsion. In the experiments, 50 mm diameter bars were turned down with multiple passes at a 250 μm depth of cut to reach a tool flank wear of 200 μm. The machining was interrupted at several stages to measure the flank wear and compare the chip forms for the aged and unaged MWF. The method of finish turning used a small tool nose radius and a small depth of cut that was found to be sensitive in detecting a difference in the flank wear and chip forms for the aged and unaged MWF. On the chemistry, the findings suggest that higher total hardness of the aged MWF was the cause of reduced lubricity and accelerated flank wear. This paper discusses the state of the art with the insights that underpin the finish turning method for the machinability assessment of MWFs. The findings point to stabilization of the MWF chemistry to maintain machining process capability over an extended sump life.

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Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

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Long Sump Life Effects of a Naturally Aged Bio-Ester Oil Emulsion on Tool Wear in Finish Turning a Ni-Based Superalloy

Wood,

Mantle,

Boud

et al. 2023

Metals

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“…Rezultati ispitivanja deemulgivnosti pokazali su da ukoliko je loše razdvajanje, lošije su i tribološke karakteristike ulja za klizne staze. [4] Testovi deemulgivnosti razvijeni od OEM proizvođača daju mogućnosti za preciznije ocjene kvaliteta ulja za klizne staze u odnosu na sposobnost razdvajanja od SHP. Jedan od testova radi se po metodi ASTM D 6553, gdje se 40 mL SHP (na bazi: sintetskih, polusintetskih ili uljnih komponenata) i 40 mL ulja za klizne staze miješa pod standardizovanim uslovima (temperatura termostatiranja ovisi o gradaciji ulja) 5 minuta.…”

Section: Eksperimentalni Diounclassified

Compatibility of slideway oils with water soluble metal working fluids

Dugić¹,

Despotović²,

Damjanović³

et al. 2017

J. eng. process. manag.

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Ključne riječi:deemulgivnost, kompatibilnost, ulje za klizne staze, vodorastvorna sredstva za obradu metala. IzvodUlja za klizne staze primjenjuju se u mnogim granama industrije, kao što je industrija automobila, hrane, pića, ambalaže, a značajne količine troše se i u malim mašinskim radionicama. Analize tržišta pokazale su da je najzastupljenija viskozna gradacija ISO VG 68, zatim slijedi ISO VG 220. S obzirom da vodorastvorna sredstva za obradu metala dolaze u kontakt sa uljem za klizne staze, cilj istraživanja je ispitivanje uticaja vodorastvornih sredstava na najčešće korišćene viskozitetne gradacije ulja za klizne staze. Kompatibilnost ulja za klizne staze i vodorastvornih sredstava je veoma važna za efektivno funkcionisanje mašina sa kliznim stazama i za radni vijek samog ulja za klizne staze. Kompatibilnost je određivana posebno prilagođenim testovima deemulgivnosti, odnosno sposobnosti odvajanja određene količine vodorastvornog sredstva za obradu metala od ulja za klizne staze. Različite formulacije sredstava za hlađenje i podmazivanje i ulja za klizne staze daju i različita vremena i odnose odvojenog ulja i vode na modifikovanom testu. Rezultati istraživanja mogu se koristiti prilikom razvoja novih formulacija ovih proizvoda, kao i kod izbora emulzionih sredstava za obradu metala i ulja za klizne staze za određenu primjenu. UVODUlja za klizne staze primjenjuju se u mnogim granama industrije. Visoka potražnja je u industrijama: automobila, hrane, pića, ambalaže, a značajna količina troši se i u malim radionicama koje se bave obradom metala. Analize tržišta pokazale su da je najzastupljenija viskozna gradacija ISO VG 68, pogotovo kod brojnih mobilnih mašina i industrijskih primjena, većinom: prijenosa, svih vrsta vodilica ( linearnih i kružnih), kao i vertikalnih i horizontalnih kliznih staza. Zatim slijedi gradacija ISO VG 220, koja se upotrebljava kod teže opterećenih horizontalnih i vertikalnih kliznih staza.[1] Na domaćem tržištu i tržištu šire regije takođe su najčešće zastupljene te dvije gradacije. Ulja za klizne staze koriste se kod svih vrsta kliznih dijelova, vretena za prijenos radnog pomaka, umjereno opterećenih pužnih i horizontalnih. Često se koriste u sistemima sa kombinovanim podmazivanjem, tj. kao hidraulična ulja i ulja za klizne staze. Maziva ulja za klizne staze trebaju ispunjavati specifikacije koje propisuju vrijednosti karakteristika različitih viskoznih gradacija. Zastupljene su slijedeće specifikacije: AFNOR E 60-203; ISO 19 378; ISO 11158 HG; MAG Cincinnati Machine P-47, P-50 i P-53; GM LS2 Way Oil; US MIL AA5913.Osnovne karakteristike ulja za klizne staze, čije vrijednosti ispunjavaju zahtjeve nabrojanih specifikacija su:-da osiguraju neprekidnost uljnog filma i dobru prionljivost na kliznu površinu; -nizak statički i dinamički koeficijent trenja; pružanje odlične antihabajuće zaštite, uključujući i rad u uslovima ekstremnih pritisaka, -izvanrednu zaštitu od korozije; -izbjegavanje stick-slip pojava; -dobru kompatibilnost sa hidrauličnim uljima i sa svim čistim reznim uljima; -d...

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Coolant lubricity and coolant-lube compatibility with regard to slideway behavior

Abstract: Coolants are widely used in industries for metal cutting operations. Though

Cited by 2 publications

References 1 publication

Long Sump Life Effects of a Naturally Aged Bio-Ester Oil Emulsion on Tool Wear in Finish Turning a Ni-Based Superalloy

Long Sump Life Effects of a Naturally Aged Bio-Ester Oil Emulsion on Tool Wear in Finish Turning a Ni-Based Superalloy

Compatibility of slideway oils with water soluble metal working fluids

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