Study of wear of tungsten carbide rolls of the wire rod block

Abstract

Maksymenko O. P., Samokhval V. M., Marchenko K. K. Study of wear of tungsten carbide rolls of the wire rod block. Material working by pressure. 2020. № 1 (50). P. 299-306.

The aim of the work is to substantiate the possibility of applying the optical method of measuring the wear of rolling mill rolls and to study the features of wear of tungsten carbide rolls of wire rod block. An optical method was used to measure the wear of the groove rolls, according to which the roll is placed on an optical stand between the light source and the lens, a template is fixed in the corresponding groove of the roll, the gap between this template and the worn surface of the groove roll is projected on the screen and the image of the gap is recorded by a digital camera. According to the results of statistical analysis of multiple measurements of wear of tungsten carbide rolls with oval and round gauge, it is established that the optical method provides measurement accuracy at the level of ± 0.01 mm. This level of accuracy is quite acceptable, so the use of optical method of measuring wear is quite justified. Based on the results of the analysis of wear measurements of the set of wire rod block rolls, the indicators of wear intensity of groove rolls are determined, which are: for oval gauges of rough modules 0.08–0.18 μm / t and for pre-finishing module M9 0.08–0.1 μm / t; for round gauges of rough modules 0.02–0.15 μm / t and for finishing modules M8, M10  0.03–0.08 μm / t. The analysis of wear contours revealed that for oval gauges in most cases there is a uniform distribution of wear relative to the axis of symmetry of the gauges. For round gauges, the displacement of the maximum wear from the axis of symmetry was revealed. From the visual analysis of worn surfaces of grooves rolls it is established that for gauges rolls of the wire block the main wear mechanisms are a combination of adhesive sticking of rolled metal and abrasive scratching. Thermal damage and corrosion for tungsten carbide rolls is insignificant. The obtained data can be used to develop a model of wear of tungsten carbide rolls and to predict their costs.