Abstract
Friction studies in sheet metal forming processes are essential for developing appropriate forming technology. This paper presents the results of experimental studies of friction occurring at the drawbead. A 0.8-mm-thick low-carbon DC04 steel sheet was used as the test material. Friction studies were conducted under machine oil lubrication conditions. Due to the anisotropy of test material properties, the friction tests considered strip specimens cut longitudinally and transversely to the sheet rolling direction (RD). The obtained results allowed the determination of the effect of friction process parameters on the coefficient of friction (CoF). For both sample orientations, increasing the drawbead height led to a decrease in the CoF. Samples cut transversely to the RD showed higher CoFs compared to specimens cut in the RD. Based on scanning electron microscopy micrographs, it was determined that the primary friction mechanisms were flattening and microploughing of sheet metal surface.
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