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Wyświetlanie 1-2 z 2
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
Artykuł
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
Artykuł
    Wyświetlanie 1-2 z 2

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