Temat: quantity - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Nanofluid assistance in machining processes – properties, mechanisms and applications: a review
Autorzy:: Grzesik, Wit
Powiązania:: https://bibliotekanauki.pl/articles/1429063.pdf
Data publikacji:: 2021
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: nanofluid
nanoparticle
machining process
minimum quantity lubrication
Opis:: A special group of hybrid assisted processes termed media-assisted processes which apply liquid media with special additives in the form of nanoparticles supplied to the cutting zone is overviewed. Special attention is paid to minimum quantity lubrication (MQL) technique with the use of nanofluids. In this review paper some important thermal and tribological effects resulting from the applications of various nanoparticles are outlined and compared. The MQL-nano cutting fluid mechanisms (rolling and ploughing) are described. In particular, some important quantitative effects concerning thermal and tribological behaviour of the cutting process as well as surface quality are presented.
Źródło:: Journal of Machine Engineering; 2021, 21, 2; 75-90
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Methods of minimalization of coolant flow rate in the grinding processes - the review
Autorzy:: Czapiewski, W.
Powiązania:: https://bibliotekanauki.pl/articles/95313.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: grinding process
grinding wheel
minimum quantity lubrication
MQL
minimal quantity cooling
MQC
cold air guns
CAG
szlifowanie
ściernica
smarowanie
chłodzenie
dysze chłodzące
Opis:: The article describes the role and types of cooling lubricants used in grinding processes. Conventional methods of coolants delivery into the grinding zone were described, such as: flood method, high-pressure jet method, centrifugal coolant provision method as well as methods method to minimize coolant flow rate: minimum quantity lubrication (MQL), minimum quantity cooling (MQC) and minimum quantity cooling lubrication (MQCL). Against this background, a methods were presented to completely eliminate grinding fluid from the grinding process (dry grinding) like: impregnated grinding wheels and cold air guns (CAG).
Źródło:: Journal of Mechanical and Energy Engineering; 2017, 1, 2; 117-122
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of surface roughness in MQL assisted turning process of titanium alloy with application of TOPSIS-AHP method
Autorzy:: Bartoszuk, M.
Gupta, M. K.
Powiązania:: https://bibliotekanauki.pl/articles/99597.pdf
Data publikacji:: 2018
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: titanium alloy
turning parameters
optimization
surface roughness
minimum quantity lubrication
Opis:: The optimization of surface roughness values considered as one of the most significant issues regarding turning process of titanium alloys with the use of minimum quantity lubrication (MQL) method. With such an aim in mind, the application of TOPSIS-AHP method is implemented in order to establish the most favourable cutting parameters for the following values of surface roughness: R_a, R_q and R_z in machining of titanium alloys regarding MQL conditions. The proposed methodology consists of the two stages. At the beginning, tests on turning process were performed on CNC lathe, taking feed rate, approach angle, and cutting speed as input parameters. Then, the TOPSIS-AHP method was applied on the given experimental data and the optimum machining parameters were determined. The findings from current investigations showed that, lower values of cutting speed, feed rate and middle value of approach angle shows the optimal results.
Źródło:: Journal of Machine Engineering; 2018, 18, 2; 97-105
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of Minimum Quantity Lubrication Using Vegetable-Based Cutting Fluids on Surface Topography and Cutting Forces in Finish Turning of Ti-6Al-4V
Autorzy:: Lisowicz, Joanna
Habrat, Witold
Krupa, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2022449.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: minimum quantity lubrication
MQL
vegetable oil
cutting fluids
Ti-6Al-4V
titanium alloy
Opis:: Titanium alloys are included in the group of difficult-to-cut materials. The use of different methods to reduce the temperature of the machining zone is one of the factors influencing the performance of the machining. The most commonly used method is flood cooling. On the basis of recent research, the conventionally used cutting fluids can cause some health problems for machine operators. Moreover, it was found that they can cause some problems for the environment during storage and disposal. Therefore, in recent years, the aspects of the use of biodegradable fluids and the reduction of the number of metalworking fluids used in machining processes have received much more attention. In this study, the effect of the application of three different vegetable oil-based cutting fluids was evaluated for minimum quantity lubrication (MQL) in finishing the Ti-6Al-4V titanium alloy on surface topography and cutting force components. The same tests were conducted for dry cutting conditions and the results were compared with those after machining with MQL. It was found that the best surface roughness was obtained with the use of the mixture of 50% vegetable oil and 50% diester (1PR20) under all the cutting parameters considered. The biggest differences in the values of the Sa and Sz parameters can be noticed for the lowest feed rate. For the feed rate f = 0.1 mm/rev, the Sa parameter values were approximately 32% and 24% lower for MQL with 1PR20 compared to MQL to LB2000 and dry cutting conditions, respectively. In terms of cutting force components, the lowest values were obtained for the MQL with 1PR20 machining. The values of the main cutting force were about 15% lower compared to the MQL with LB2000 cutting conditions for all the cutting parameters considered.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 1; 95-103
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of cooling lubricants on the surface roughness and energy efficiency of the cutting machine tools
Autorzy:: Jersák, J.
Simon, S.
Powiązania:: https://bibliotekanauki.pl/articles/265834.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: machining
turning
milling
process fluids
minimum quantity lubrication
chropowatość powierzchni
smar chłodzący
narzędzia skrawające
obróbka skrawaniem
Opis:: The Technical University of Liberec and Brandenburg University of Technology Cottbus-Senftenberg investigated the influence of cooling lubricants on the surface roughness and energy efficiency of cutting machine tools. After summarizing the achieved experimental results, the authors conclude that cooling lubricants extensively influence the cutting temperature, cutting forces and energy consumption. Also, it is recognizable that cooling lubricants affect the cutting tools lifetime and the workpiece surface quality as well. Furthermore, costs of these cooling lubricants and the related environmental burden need to be considered. A current trend is to reduce the amount of lubricants that are used, e.g., when the Minimum Quantity Lubrication (MQL) technique is applied. The lubricant or process liquid is thereby transported by the compressed air in the form of an aerosol to the contact area between the tool and workpiece. The cutting process was monitored during testing by the three following techniques: lubricant-free cutting, cutting with the use of a lubricant with the MQL technique, and only utilizing finish-turning and finish-face milling. The research allowed the authors to monitor the cutting power and mark the achieved surface quality in relation to the electrical power consumption of the cutting machine. In conclusions, the coherence between energy efficiency of the cutting machine and the workpiece surface quality regarding the used cooling lubricant is described.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 779-787
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Wpływ posuwu wzdłużnego na zużycie frezu ślimakowego i siły skrawania podczas frezowania obwiedniowego z minimalnym wydatkiem cieczy obróbkowej (MQL)
Influence of axial feed in hobbing with minimal quantity lubrication (MQL) on wear of the hob and cutting forces
Autorzy:: Stachurski, W.
Powiązania:: https://bibliotekanauki.pl/articles/197683.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: posuw wzdłużny
zużycie
frez ślimakowy
siły skrawania
frezowanie obwiedniowe
minimalny wydatek cieczy obróbkowej
axial feed
wear
cutting forces
hobbing
minimum quantity lubrication
Opis:: W artykule dokonano oceny wpływu zmiany posuwu wzdłużnego podczas frezowania obwiedniowego kół zębatych z minimalnym wydatkiem cieczy obróbkowej (metoda MQL) na zużycie frezu ślimakowego oraz siły skrawania. Badania wykonano frezując stal C45 frezem ślimakowym ze stali szybkotnącej HS6-5-2 bez pokryć przeciwzużyciowych. Dla porównania przeprowadzono próby podczas frezowania „na mokro”. W trakcie badań wykorzystano dwa posuwy przy stałej prędkości skrawania. Koła frezowano na pełną głębokość wrębów. Podczas frezowania mierzono siłę skrawania. Zużycie narzędzia mierzono w sposób bezpośredni jako szerokość starcia na powierzchni przyłożenia (nie zaobserwowano istotnego zużycia na powierzchni natarcia). Przyjęto, że parametrem kryterialnym dla zużycia będzie stała długość frezowania. Wyniki badań przedstawiono w postaci wykresów zmian zużycia dla najbardziej obciążonego zęba frezu oraz wykresów przebiegów sił skrawania. Na podstawie uzyskanych wyników ustalono, że metoda MQL może być alternatywną metodą podawania cieczy obróbkowej podczas frezowania obwiedniowego.
In the paper evaluation of the influence of axial feed on the hob wear in hobbing with minimal quantity lubrication technique has been done. As a work material C45 carbon steel has been investigated. Wear resistance of the hob made from high speed steel HS6-5-2 without coating has been investigated. For comparison tests with conventional fluid supply method have been carried out. Gears have been generated with full depth of cut and with two axial feed with constant cutting speed value. During hobbing cutting forces have been measured by experimental stand. Tool wear has been measured directly as a width of flank wear land of the hob cutter teeth. During investigation any significant wear changes on the rake faces haven’t been detected, so those results haven’t been taken into consideration. A constant length of cut parameter has been established as a criteria value. Results of investigation have been presented in the form of graphs describing changes of wear land width parameter in comparison to the most loaded tooth wear land parameter. Also changes of cutting forces in time are presented too. On the base of obtained results conclusion has been formulated that MQL technique might be used as an alternative solution for supplying cutting fluid into the cutting zone during hobbing process.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2015, 89; 155-161
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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