Bilal ÇOLAK, Zahoor AHMED, Batuhan ÖZAKIN, Naci KURGAN

Çelik Sacların Asimetrik Haddelenmesinde Pürüzlülük Transferinin Deneysel Olarak İncelenmesi

Bu çalışmada asimetrik haddelemede hız, kalınlık azalması, merdane yüzey pürüzlülüğü, malzeme kalınlığı, yüzey durumu (kuru veya yağlanmış) ve haddeleme kuvveti gibi haddeleme parametrelerinin pürüzlendirme karakterizasyonu üzerindeki etkisi incelenmiştir. Haddeleme testine tabi tutulan numunelerin yüzey pürüzlülükleri ölçülmüştür. Pürüzlülük değerlerinin ortalaması ve standart sapması belirlenerek 3 boyutlu tarama görüntüleri elde edilmiştir. Yağlanmış pürüzlendirme deneyleri, yağlamanın pürüzlülük transferini azalttığını ortaya çıkarmıştır. Haddeleme hızı arttıkça malzeme yüzeyindeki pürüzlülüğün azaldığı bulunmuştur. Öte yandan yüksek hız, yüzey pürüzlülüğünü artıran haddeleme kuvvetini artırıcı bir etkiye sahip olduğu görülmüştür. Hızın standart sapma üzerindeki etkisi doğru orantılı olarak değişmektedir. Ayrıca yağlı haddeleme yüksek hızlarda daha homojen bir pürüzlülük dağılımı sağlarken, kuru haddeleme daha düşük hızlarda homojen bir pürüzlülük vermiştir. Kalın malzemelerle haddeleme kuvvetinin daha yüksek olduğu ortaya çıkmıştır. Kalın malzeme kullanımında merdane pürüzlülüğünün haddeleme kuvvetine fazla etkisi olmazken, ince malzeme kullanımında çok pürüzlü merdanede bu etki daha belirgin olmuştur. Pürüzlü ve çok pürüzlü merdanelerin kullanıldığı küçük ezme oranlarında standart sapmanın daha düşük olduğu görülmüştür. Elde edilen sonuçlara göre asimetrik haddelemenin geleneksel haddelemeye göre bazı avantajları olmasına rağmen çelik sacların pürüzlendirilmesi için uygun bir yöntem olmadığı sonucuna varılmıştır.

Anahtar Kelimeler:

Asimetrik haddeleme, Homojen pürüzlülük, Haddeleme kuvveti, Haddeleme hızı, Merdane pürüzlülüğü, Pürüzlülük transferi

An Experimental Investigation into Roughness Transfer in Asymmetrical Rolling of Steel Strips

This study investigated the effect of rolling parameters such as speed, thickness reduction, roll surface roughness, material thickness, surface condition (dry or lubricated), and rolling force on the roughening characterization in asymmetrical rolling. The surface roughness of the samples subjected to rolling tests was measured. The roughness values' average and standard deviation were found, and 3-D scanning images were acquired. Lubricated texturing experiments revealed that lubrication reduced roughness transfer. It was found that the introduction of roughness on the material surface decreased as the rolling speed increased. On the other hand, a higher speed increases the rolling force, which increases the surface roughness. The effect of speed on the standard deviation varies in direct proportion. Furthermore, lubricated rolling produced a more homogenous roughness distribution at higher speeds, while dry rolling produced homogeneous roughness at lower speeds. It was revealed that the rolling force is higher with thicker materials. While the roll roughness did not affect the rolling force using thicker material much, this effect was more pronounced in the very rough roll using thinner material. The standard deviation was lower in smaller reduction ratios using rough and very rough rolls. According to the results, although asymmetrical rolling has some advantages compared to conventional rolling, it was concluded that it is not a suitable method for roughening steel strips.

Keywords:

Asymmetrical rolling, Homogeneous roughness, Rolling force, Rolling speed, Roll roughness, Roughness (transfer).,

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