Effect of Surface Treatment on the Wear of Spindle-Neck Coating with a Collapse Balloon Crown

摘要

The paper presents test results of the effect of the surface treatment type on the wear of spindle-neck coating with a collapse balloon crown of ring spinning frames within industrial conditions of mating with yarn. The tests comprised measurements, using the optical method, of spindle-neck coating produced from EN AW-2024 (AlCu4Mg1) alloy, and subjected to, in the first variant, the operation of burnishing, and in the second variant – the burnishing operation followed by hard anodic oxidation and grinding with abrasive paper having a grain size of 600. Moreover, to be able to do it, the circularity deviation of the cylindrical part of the neck coating at the same distances from the face of the crown were measured with the use of a Taylrond 365 circularity tester. Next, based on the contours of circularity obtained, a contour of cylindrical shape of the spindle-neck coating, both burnished and burnished and anodic oxidized, brand-new and after an operational time was prepared. An assessment of the topography and microphotography of the oxide layer of the spindle-neck coating was performed, both in brand-new condition and after an operational time. Analysis of the wear and tear process, as well as the thickness of the oxide layer, in brand-new condition and after an operational time, confirmed that the oxide layer assures a wear-resistance several times higher. As a result of the hard anodic oxidation implemented, equalisation of the durability of the spindle-neck coating occurres with the durability of the bearing system.