CFRP/Al-7075 istifli delmede matkap uç açılarının delinebilirlik üzerine etkisi

Year 2020, Volume: 35 Issue: 2, 917 - 932, 25.12.2019

Erman Aydın Muammer Nalbant

https://doi.org/10.17341/gazimmfd.548419

Cited By: 5

Abstract

Bu çalışmada, askeri ve sivil havacılık alanında
yoğun olarak kullanılmakta olan karbon fiber takviyeli polimer kompozit (CFRP)
malzeme ve Al-7075 alaşımının oluşturduğu CFRP/Al-7075 istifli yapının, 120º-130º-140º
uç açılarına sahip kaplamasız karbür matkaplar ile delinebilirliği
araştırılmıştır. Delme süreçlerinde itme kuvveti (F_z), moment (M_z),
delik ortalama yüzey pürüzlülükleri (R_a), talaş yapıları ve CFRP
malzemede meydana gelen delaminasyonlar (F_d) incelenmiştir. Deneysel
çalışmalar kuru kesme şartlarında 50 m/dk.. kesme hızı ve 0,05 mm/dev. sabit
ilerleme değerinde, doğrudan delme yönteminde gerçekleştirilmiştir.  120° ve 130° uç açılı matkaplar CFRP malzemede
yakın F_z ve F_d değerleri sergilerken, uç açılarına göre
en düşük F_z, M_z, R_a ve en düşük F_d
verileri sırasıyla 130°-120º-140º uç açılı matkaplarda elde edilmiştir. 140° uç
açılı matkapta, esas kesici kenarda yoğun miktarda çapaklanma ve yığıntı talaş
(Built up edge BUE) meydana gelmiş ayrıca matkap helis kanallarında Al talaşları
sıvanmıştır. Deneysel çalışmaların ardından matkap uç açılarının itme kuvveti (F_z)
ve ortalama yüzey pürüzlülüğü (R_a) üzerine etkileri %95 güven
aralığında ANOVA ile belirlenmiş ve çoklu karşılaştırma testleri uygulanmıştır.
Sonuç olarak, 130º uç açılı kaplamasız karbür matkabın moment, itme kuvveti, ortalama
yüzey pürüzlülüğü ve delaminasyon bakımından belirtilen kesme parametreleri ve
delme koşulları doğrultusunda CFRP/Al-7075 istifli delme işleminde daha iyi
sonuçlar verdiği görülmüştür.

Keywords

CFRP, Al-7075, istifli delme, delik yüzey pürüzlülüğü, delaminasyon

The effect of drill point angles on drillability in CFRP/Al-7075 stacking drilling

Abstract

In this study, the
drillability of CFRP/Al-7075 stacked structure which is formed by carbon fiber
reinforced polymer composite (CFRP) material, which is used intensively in the
field of military and civil aviation, and Al-7075 alloy has been investigated
by drilling with uncoated carbide drills with different point angles. In the
drilling processes thrust force (F_z), moment (M_z), hole
average surface roughness (R_a), chip structure and delamination (F_d)
occurring in CFRP material were investigated. Experimental studies were
performed under dry cutting conditions with 50 m/min cutting speed and 0.05 mm/rev
constant feed rate by using three different drill (120º-130º-140º) point angles
uncoated carbide drills. 120° and 130° point angle drills are showed close F_z
and F_d values in the CFRP material, while the lowest F_z, M_z,
R_a and lowest F_d value are obtained respectively in
130°-120º-140º point angle drills. In the 140° point angle drill, a large
amount of burring and built-up edge (BUE) was formed on the main cutting edge
and Al chips were plastered in the drill helix flutes. After experimental studies,
the effects of drill point angles on thrust force and average surface roughness
were determined by ANOVA at 95% confidence interval and multiple comparison
tests were applied. As a result, it has been seen that 130º point angle
uncoated carbide drill gives better results in terms of moment, thrust force,
average surface roughness and delamination, under specified cutting parameters
and drilling conditions in CFRP/Al-7075 stacking drilling.

Keywords

CFRP, Al-7075, stacking drilling, hole surface roughness, delamination

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