Temat: feed force - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Study on the Machinability of Glass, Carbon and Aramid Fiber Reinforced Plastics in Drilling and Secondary Drilling Operations
Autorzy:: Ciecieląg, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2181747.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: polymer composites
machining
drilling
roughness
feed force
drilling conditions
Opis:: Composite materials are usually subjected to machining processes, especially when they are used to for the aviation and automotive industries. Apart from side surface milling and face milling, these materials are subjected to machining to make holes and countersinking holes, cuts of complex shape, recesses, and grooves. One of the many machining methods for polymer composites is drilling. The accuracy of a drilled hole is very important for operational reasons, because it has impact on the quality and strength of the connection between polymer composite elements and structural elements. This paper shows the results of a study investigating the impact of drilling and secondary drilling as well as technological drilling parameters on the maximum feed force, surface roughness and hole quality. Holes were drilled in glass, carbon and aramid fiber reinforced plastics. The study has shown that the highest maximum feed force occurs when drilling in aramid fiber reinforced plastic. The lowest values of the maximum feed force were obtained when drilling in glass fiber reinforced plastic. The influence of drilling parameters on surface roughness during drilling holes in composite materials was also determined. The highest values of roughness parameters were obtained in the machining of aramid fiber reinforced plastic, while the lowest roughness parameters were obtained on the hole surface when drilling in carbon fiber reinforced plastic.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 2; 57--66
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of Composite Material Fixing on Hole Accuracy and Defects During Drilling
Autorzy:: Ciecieląg, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2123286.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: drilling
delamination
carbon fiber reinforced plastics
glass fiber-reinforced plastics
feed force
Opis:: This study investigates the effect of composite material stiffness on the accuracy of drilled holes and delamination in the drilling process. Two types of composite materials were tested: glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). The drilling process was performed using dedicated drill bits. Samples were clamped in a vice of the Avia-VMC 800 HS vertical machining center. Drilling parameters were maintained constant but unsupported element length was changed. The unsupported element length was defined as an unsupported distance between the drilled hole axis and the sample attachment location. The maximum feed force Ff was determined in the experiments. The accuracy of drilled holes was estimated by optical microscopy. Diameters of the drilled holes were measured. Results made it possible to determine the recommended unsupported element length at which the hole dimensions were within the dimensional tolerance. The study showed a clear decrease in the drilled hole quality and a significant increase in the feed force, especially in the area of tool exit from the workpiece. In addition, the number of delaminated fibers increased with unsupported element length was determined in the study.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 3; 54--65
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wpływ wybranych parametrów skrawania na dokładność obróbki w procesie wiercenia stopu Ti6Al4V
Effect of cutting parameters in the aspect of the accuracy of drilling processing titanium alloys Ti6Al4V
Autorzy:: Szwajka, Krzysztof
Zielińska-Szwajka, Joanna
Powiązania:: https://bibliotekanauki.pl/articles/945987.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:: wiercenie
siła posuwowa
moment skrawania
wióry
stop tytanu
drilling
feed force
cutting moment
chips
titanium alloy
Opis:: Wiercenie materiałów ciągliwych, do których zalicza się Ti6Al4V, często wiąże się z niewystarczającym odprowadzeniem wiórów, co prowadzi do wystąpienia zakłóceń procesu obróbki. Wióry powstające w trakcie procesu wiercenia materiałów plastycznych są ciągliwe i mają skłonność do gromadzenia się w rowkach wiórowych narzędzia. Takie gromadzenie się wiórów może skutkować zarysowaniami powierzchni otworu, przyklejeniami materiału do narzędzia skrawającego, a także do przyśpieszonego zużycia ostrza skrawającego. W niniejszym artykule przedstawiono wyniki badań uzyskane w procesie wiercenia stopu tytanu Ti6Al4V w aspekcie dokładności wymiarowo-kształtowej uzyskanych otworów. Obróbkę prowadzono bez chłodziwa (na sucho) przy różnych zestawach parametrów skrawania. W ramach badań monitorowano siłę posuwową i moment skrawania, dokładność kształtowo-wymiarową, jakość powierzchni otworu oraz kształt wiórów. Wyniki badań pokazują, że zarówno jakość otworu, jak i jego dokładność wymiarowo-kształtową można poprawić przez odpowiedni dobór parametrów skrawania. Ponadto, obserwacja powierzchni na wyjściu narzędzia z materiału wskazywała na występowanie odkształceń plastycznych (zadziory) związanych z parametrami skrawania. Wyniki eksperymentu wykazały także, że na kształt i wielkość zadziorów istotny wpływ ma prędkość posuwu.
The drilling of ductile materials, such as Ti6Al4V, is often associated with insufficient chip evacuation, resulting in disturbances in the machining process. Chips formed during the drilling process of plastic materials are ductile and tend to accumulate in the chip flutes of the tool. Such chip formation may result in scratches on the hole surface, sticking the material to the cutting tool, and also on accelerated wear of the cutting edge. This article presents the analysis of the drilling process and assessment of the quality of the hole after drilling Ti6Al4V titanium alloy without coolant at various processing parameters. As part of the research, the feed force and cutting moment were monitored, the shape and dimensional accuracy and the quality of the hole surface and the shape of the chips. The test results show that the hole quality can be improved by appropriate selection of cutting parameters. Observation of the surface at the exit of the tool from the material indicated plastic deformation (burrs) in different cutting conditions. The results of the experiment also showed that the shape and size of burrs is strongly influenced by the feed speed.
Źródło:: Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2019, z. 91 [299], 1-2; 79-92
0209-2689
2300-5211
Pojawia się w:: Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental Investigation of Process Parameters in Drilling LM25 Composites Coated with Multi Wall Carbon Nano Tubes Using Sonication Process
Autorzy:: Sangeetha, M.
Prakash, S.
Powiązania:: https://bibliotekanauki.pl/articles/352817.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: drilling
feed rate
Hybrid Metal Matrix Composites
response surface methodology
sonication
thrust force
Opis:: Aluminium based metal matrix composites are widely used in automobile components such as cardan shaft of Chevrolet corvette, disc brake and engine push rod. In this experiment a Hybrid Metal Matrix Composites (HMMC) are fabricated and drilled. Drilling is the process of making slots in disc brake and thread in the engine parts. The surface quality of the drilled specimen depends on the speed, feed, drill type and the thrust force. Thrust force plays the major role in drilling the specimen. In this experiment HMMCs are fabricated using two processes-called, sonication and casting. Sonication is the process of coating the carbon nanotubes over the silicon carbide particles (SiCp). Semisolid stir casting is used to reinforce the coated SiCp in the LM 25 alloy. A drilling process is performed on HMMC to analyse the extent to which the input parameters influence the thrust force and Ovality. The tools used for drilling are solid carbide tools of three different diameters. Taguchi’s experimental design is adopted for the drilling operation. A mathematical model is used to determine the influence of input parameters on the outputs thrust force and ovality. This paper proves the combination of N₃ , f₁ and d1 of the carbide tool results in the lowest value of thrust force and ovality while drilling HMMCs. In this work the HMMC is prepared by coating the abrasive nature, silicon carbide particle and there is a good interfacial bonding between the reinforced particle and matrix and the drilling process becomes smoother. The new being of this article is the treated ceramics, SiCp with carbon nanotubes. This HMMC shows the improved mechanical properties compared to other metal matrix composites surveyed in the literatures.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1761-1770
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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