An Investigation of Punching the MWCNTs Doped Composite Plates by Using Different Cutting Profiles
Abstract:In this study, glass fiber reinforced composite layers which are with and without additives of 0.1 wt.% multi walled carbon nanotubes (MWCNTs) of epoxy were manufactured by vacuum infusion method. Unlike the conventional methods, punching was used in processing and drilling of these materials. The 62 -64 HRC hard punches made of 1.3343 material with specially designed 90°, 30°, 15°, V, C profiles were used for punching of composites. Additionally, made of 1.2379 material with 62 -64 HRC hardness, the mold with… Show more
“…Furthermore, at low electrolyte flow rate, unfavorable streaks may appear on the treated surface [6]. Another technique used in the processing of composites, which replaces, for example, drilling, can be punching [10].…”
The paper presents the results of burnishing tests of composites based on AlSi9Mg aluminum alloy matrix, reinforced with Saffil ceramic fibers and silicon carbide particles. The tested material was produced at the Wroclaw University of Science and Technology. The tested materials were turned and then ball burnished. After each subsequent burnishing pass, the surfaces were measured by contact and the roughness parameters were calculated. It has been found that it is possible to obtain the Sa roughness of composites thanks to burnishing at the level of 0.1 µm. The paper shows that for each material there is an optimal and limit number of passes, which guarantees the lowest roughness for a fiber-reinforced composite these are 4 passes, and for a composite reinforced with SiC particles 5 passes. The research showed that the reduction of the roughness peaks of composites after burnishing is definitely greater than that of the valleys. The research presented in the article broadens the knowledge of aluminum composites burnishing.
“…Furthermore, at low electrolyte flow rate, unfavorable streaks may appear on the treated surface [6]. Another technique used in the processing of composites, which replaces, for example, drilling, can be punching [10].…”
The paper presents the results of burnishing tests of composites based on AlSi9Mg aluminum alloy matrix, reinforced with Saffil ceramic fibers and silicon carbide particles. The tested material was produced at the Wroclaw University of Science and Technology. The tested materials were turned and then ball burnished. After each subsequent burnishing pass, the surfaces were measured by contact and the roughness parameters were calculated. It has been found that it is possible to obtain the Sa roughness of composites thanks to burnishing at the level of 0.1 µm. The paper shows that for each material there is an optimal and limit number of passes, which guarantees the lowest roughness for a fiber-reinforced composite these are 4 passes, and for a composite reinforced with SiC particles 5 passes. The research showed that the reduction of the roughness peaks of composites after burnishing is definitely greater than that of the valleys. The research presented in the article broadens the knowledge of aluminum composites burnishing.
İmalat sektörlerinde pul ihtiyacı genellikle zımba ve kalıp sistemleri kullanılarak karşılanmaktadır. Bu sistemlerde istenilen pul çapı kalıp mühre çapına işlenmekte, zımba çapı ise kesme boşluğu ölçüsü kadar küçültülerek delme işlemleri kalıp veya aparatlar üzerinde yapılmaktadır. Bu çalışmada ÇCKNT (çok cidarlı karbon nanotüp) katkılı ve katkısız CETP (cam elyaf takviyeli polimer) kompozit malzemelere 0.16 mm kesme boşluğu bulunan kalıplarda 90°, 15°, 30°, V, C tipi kesme formu bulunan Ø8 mm'lik zımbalar ile delik delinerek elde edilen pullar incelenmiştir. Yapılan çalışma neticesinde elde edilen pulların zımba kesme formunu aldığı, katkısız kompozitlerin 90° düz formlu zımba ile delinmesinde elde edilen pul çapının zımba ve mühre çapına göre sırasıyla % 4.75 ve % 0.72 oranında daha büyük ölçüde olduğu tespit edilmiştir. Ayrıca CETP kompozit malzemelere ÇCKNT katkısı malzemelerin dayanımını arttırarak zımba ile kesilmesi neticesinde elde edilen pulların daha rijit olmasını sağlamıştır. Bu sebeple katkılı kompozitlerin pul çapının zımba çapından büyük, mühre çapından küçük olduğu tespit edilmiştir.
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