Effect of process parameters on friction in aluminum sheet forming

Abstract

Abstract. The bending under tension (BUT) test is used to mimic aluminum sheet forming process and study the effect of friction on drawing force. Multidraw Drylube E1 was used to lubricate the samples. Experiments were designed and executed to study the effects of rolling direction, lubricant amount, roll temperature and contact pressure on the drawing force. Strain in the sample was measured using digital image correlation (DIC) technique. Real area of contact is calculated using height distribution histograms of the surface in contact. Apart from the back force, variations in drawing force results from changes in bending and unbending force and friction force. The results imply that the friction force will not necessarily increase with increasing the back force and it depends on the contact pressure.