Alüminyum Alaşımının Derin Çekilmesine Sıcaklığın Etkisinin Deneysel ve Sayısal Olarak Araştırılması

Yıl 2018, Cilt: 21 Sayı:1, 193 - 199, 31.03.2018

Cebeli Özek Vedat Taşdemir

https://doi.org/10.2339/politeknik.392126

Cited By: 2

Öz

5000 serisi Al-Mg alaşımları,
süneklik, iyi kaynak edilebilirlik, yüksek mukavemet ve düşük ağırlık
özelliklerinden dolayı geniş bir uygulama alanına sahiptirler. Bununla birlikte
bu alaşımların oda sıcaklığında şekillendirilmesi mikroyapılarından dolayı çelik
saclara nazaran zordur. Bu problemlerin üstesinden gelmenin en etkili yolu ılık
şekillendirmedir. Bu çalışmada, şekillendirme sıcaklığının limit çekme oranı,
ıstampa kuvveti, et kalınlığı, mikrosertlik ve gerilmeye etkisi deneysel ve
sayısal olarak araştırılmıştır. Deneyler 25^oC, 100^oC, 175^oC
ve 250^oC sıcaklıklarında, 3600 N baskı plakası kuvvetinde
gerçekleştirilmiştir. Yapılan çalışmalar sonucunda sıcaklığın artması ile et
kalınlığı değişiminin daha homojen hale geldiği, limit çekme oranının arttığı,
mikrosertlik, gerilme ve ıstampa kuvvetinin azaldığı belirlenmiştir. Sonlu
elemanlar yöntemi (SEY) ile elde edilen sayısal sonuçların deneysel veriler ile
elde edilen sonuçlara yakın oldukları gözlenmiştir. 

Anahtar Kelimeler

AA5754 sac malzeme, limit çekme oranı, ılık derin çekme, mikrosertlik, sonlu elemanlar yöntemi

Experimental and Numerical Investigation of the Effect of Temperature on Deep Drawing of Aluminum Alloy

Öz

5000 series of Al-Mg alloys have found very wide
application areas due to their ductility, good weldability, high strength and
low weight properties. However, forming of these alloys is more difficult than
steel sheets at room temperature due to their microstructure. The most
effective way to overcome these problems is the warm forming. In this study,
the effect of forming temperature on limit drawing ratio, punch force, wall
thickness, microhardness and stress of cup were investigated experimentally and
numerically. The experiments were conducted at 25°C, 100°C, 175°C, and 250°C
temperatures under 3600 N blank holder force. 
As a result of the studies, it was determined that an increase in
forming temperature led to more homogeneous distribution of wall thickness,
increase of limit drawing ratio, decrease of microhardness, stress and punch
forces. The finite element analysis (FEA) model results were also in a good
agreement with the experimental results. 

Anahtar Kelimeler

AA5754 sheet metal, limit drawing ration, warm deep drawing, microhardness, finite element analysis

Kaynakça

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