THE MECHANISM OF OPERATIONAL WEAR OF SPINDLE-NECK COATING OF SPINNING SPINDLES MADE OF AlCu4Mg1 ALLOY DUE TO COOPERATION WITH A STREAM OF YARNS

摘要

Results of the investigations of wear of spindle-neck coating with a collapse balloon crown of ring spinning frames, resulting from cooperation with stream of yarn within industrial conditions are discussed in the paper. The study have comprised measurements of the wear of spindle-neck coating made of EN AW-2024 (AlCu4Mgl) alloy after performed burnishing treatment in the course of cooperation with blend of 70 - 80% wool fibres with the addition of 30-20% polyester fibers, causing the greatest wear. Before and after the period of the operation, based on produced outlines of the roundness of the cylindrical part of the burnished neck of the coating, outlines of the cylindricity of the neck of the spindle have been drawn. Next, using the shape-meter, performed measurements were made of the wear on the spindle-neck coating having the form of a helical groove in the direction perpendicular to its run. There were also 2D measurements performed of the roughness on the neck of coating of spinning spindle, and photos were taken of side surface of the wear in form of helical groove, and one has an inserted EDS spectrum for the surface in the location of the precipitation (phase of AlCuFeMnSi type - point 2). Assessment of the surface in friction area between the spindle-neck coating and the stream of the fibres and the microphotography of side surface of the helical groove lead to the conclusion that the wear of the spindle-neck coating made of AlCu4Mgl alloy, outside the deep grove, occurs as the result of abrasion, while inside the groove as the result of abrasion and oxidation.