AA2024-T3 Alüminyum Alaşımlarının Soğuk Haddeleme İşleminde Pürüzlülük Transfer Davranışının Deneysel İncelenmesi

Öz

Sac malzemeler ideal düzeyde boyanma ve şekillendirilebilme amacıyla pürüzlü olarak imal edilirler. Bu işlem soğuk haddelemenin son aşamasında pürüzlü merdaneler kullanılarak gerçekleştirilir. Pürüzlü merdaneler arasından geçen sac malzeme nihai olarak pürüzlenir ve kullanıma sunulur. Alüminyum alaşımları hafiflik, yüksek korozyon direnci ve yüksek mekanik özellikler gibi üstün özellikler sergilemesinden ötürü birçok endüstride kullanım görmektedir. Alüminyum sac malzemelerin soğuk haddeleme ile pürüzlendirmede yüzey pürüzlülük davranışlarının belirlenmesi amacıyla bu çalışma yürütülmüştür. Bu kapsamda AA2024-T3 alüminyum alaşımları farklı redüksiyon oranlarında (%1, %5, %10, %20) pürüzlü merdaneler kullanılarak soğuk haddeleme işlemine tabi tutulmuştur. Testler esnasında haddeleme kuvvetleri test düzeneğinden okunmuş ve farklı redüksiyon oranlarında haddeleme ile pürüzlendirilen yüzeylerin Ra, Rv ve Rp pürüzlülük parametreleri ile pürüzlülük profilleri elde edilmiştir. Redüksiyon oranı arttıkça haddeleme kuvveti ve pürüzlülük transfer oranının arttığı belirlenmiştir. %1 redüksiyon oranında yapılan soğuk haddeleme ile pürüzlülük transferinde pürüzlülük parametreleri, pürüzlülük dağılımı ve yüzey görüntüleri birlikte değerlendirildiğinde sac malzeme yüzeylerinde homojen pürüzlülük dağılımı söz konusu iken %5 ve artan redüksiyon oranlarında ise homojen pürüzlülük dağılımının giderek bozulduğu sonucuna varılmıştır.

Anahtar Kelimeler

• Temper haddeleme
• Tekstür transferi
• Pürüzlü yüzeyler
• Sac haddeleme
• Yüzey topografyası

Experimental Investigation of Roughness Transfer Behavior of AA2024-T3 Aluminum Alloys in Cold Rolling

Abstract

Sheet materials are manufactured with roughness in order to be ideally painted and shaped. This process is carried out in the final stage of cold rolling using roughened rolls. The sheet material passing between the rough rolls is finally roughened and put into use. Aluminum alloys are used in many industries due to their superior properties such as light weight, high corrosion resistance and high mechanical properties. This study was carried out to determine the surface roughness behavior of aluminum sheet materials in cold rolling roughening. In this context, AA2024-T3 aluminum alloys were subjected to cold rolling process using roughened rolls at different reduction ratios (1%, 5%, 10%, 20%). During the tests, the rolling forces were read from the test equipment and the roughness parameters Ra, Rv and Rp and roughness profiles of the surfaces roughened by rolling at different reduction ratios were obtained. It was determined that the rolling force and roughness transfer ratio increased as the reduction ratio increased. When the roughness parameters, roughness distribution and surface images were evaluated together in the roughness transfer with cold rolling at 1% reduction ratio, it was concluded that there was a homogeneous roughness distribution on the sheet material surfaces, while the homogeneous roughness distribution gradually deteriorated at 5% and increasing reduction ratios.

Keywords

• Skin-pass (temper) rolling
• Texture transfer
• Rough surfaces
• Sheet rolling
• Surface topography

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