Al-30Zn Alaşımının Delinmesinde Yüzey Cevap Metodu (YCM) Kullanarak İlerleme Kuvveti ve Yüzey Pürüzlülüğünün Optimizasyonu

Year 2020, , 804 - 813, 15.07.2020

Şenol Bayraktar , Ali Paşa Hekimoğlu

https://doi.org/10.17714/gumusfenbil.672576

Abstract

Bu
çalışmada kokil kalıba döküm yöntemi ile Al-30Zn alaşımı üretilmiştir. Sertlik,
çekme mukavemeti ve alaşımın kopma uzaması değerleri belirlendikten sonra delme
testleri yapıldı. Alaşım külçesinden 80x50x20 mm boyutlarında iş parçası
hazırlanmış ve 8 mm çaplı, 30° helis ve 118° uç açılı kaplamasız HSS (High
speed steel) matkaplarla delme testleri yapılmıştır. Delme testleri, istatistiksel
analiz yazılımından elde edilen yüzey cevap metodu (RSM) deneysel tasarımına
göre yapılmıştır. Bağımsız değişkenler, kesme hızı (600-900-1200 dev/dak) ve
ilerleme miktarı (0.05-0.15-0.25 mm/dev), bağımlı değişkenler ise itme kuvveti
ve yüzey pürüzlülüğü olarak tanımlanmıştır. Deney sonuçlarına göre bağımsız
değişkenlerin bağımlı değişkenler üzerindeki istatistiksel etkisi ANOVA ile
analiz edilmiş ve optimum kesme parametreleri belirlenmiştir. Buna göre, itme
kuvveti ve yüzey pürüzlülüğü üzerinde en etkili bağımsız değişkenlerin
sırasıyla ilerleme miktarı ve kesme hızı olduğu gözlenmiştir. Ayrıca minimum
hedef fonksiyonuna göre optimum kesme şartları 1200 dev/dak kesme hızı ve 0.05
mm/dev ilerleme miktarı olarak belirlenmiştir. Doğrulama testleri ile istatistiksel
sonuçların optimum kesme şartlarına bağlı olarak oldukça uyumlu olduğu tespit
edilmiştir.

Keywords

Delme, Optimizasyon, Yüzey Cevap Metodu, Yüzey Pürüzlülüğü, İtme Kuvveti

Optimization of Thrust Force and Surface Roughness Using Response Surface Methodology (RSM) in Drilling of Al-30Zn Alloy

Abstract

In
this study, Al-30Zn alloy was produced by permanent mold casting method.
Drilling tests were performed after the values of hardness, tensile strength
and elongation to fracture of the alloy were determined. 80x50x20 mm in
dimensions workpiece was prepared from alloy ingot and drilling tests were
performed with 8 mm diameter, 30° helix and 118°-point angle uncoated HSS (High
speed steel) drills. Drilling tests were performed according to the
experimental design obtained in response surface methodology (RSM) statistical
analysis software. Independent variables were defined as cutting speed
(600-900-1200 rev/min) and feed rate (0.05-0.15-0.25 mm/rev), while dependent
variables were defined as thrust force and surface roughness. According to the
experimental results, the statistical effect of independent variables on
dependent variables was analyzed with ANOVA and optimum cutting parameters were
determined. Accordingly, it was observed that the most effective independent
variables on thrust force and surface roughness were feed rate and cutting
speed, respectively. In addition, optimum cutting conditions according to
minimum goal function were determined as cutting speed of 1200 rev/min and feed
rate of 0.05 mm/rev. It was found that validation tests and statistical results
were quite compatible depending on optimum cutting conditions.

Keywords

Drilling, Optimization, Response Surface Methodology, Surface Roughness, Thrust Force

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