Experiment And Simulation Of Tribological Law Of Roll Coating In Twin-Roll Continuous Strip Casting

Twin roll strip continuous casting technology has attracted many attentions of the world steel practitioners, because of its advantages such as the short production process flow, less cost and energy saving. Crystal roll is one of the core components of twin roll strip casting technology, the wear of the coating will affect the quality of products and crystal rolls’ online cycle directly and the production costs. Find out the friction and wear law of crystal roll can improve the quality of the product effectively and extend the life of crystal roll, and then reduce the cost of production greatly. Therefore, research the tribological law of roll coating in twin-roll continuous strip casting has important theoretical value and practical significance.This paper studied on crystallization roll of twin-roll continuous strip casting, used twin-roll strip casting machine of a certain company as the prototype, and made reasonable simplification according to the practical process parameters, to simulate the friction and wear law of crystal roller of twin roll strip continuous casting in actual conditions, the influence of load, speed, time on friction and wear regularity of copper-based nickel coating were inspected especially. Using scanning electron microscope, microstructure morphology of nickel coating was observed, constituent of coating was analyzed with EDS and wear debris was analyzed with X-ray to get the friction and wear regularity of copper-based nickel coating from the angle of micro.A reasonable simplification was made according to the actual production situation, the simplified model of the crystal roller was established, the molten pool model was established, and the model of rolling was established. Roll profile changes of crystal roller caused by assembly and heated were carried on the simulation computation, the height of Kiss point in molten pool along the axial direction corresponding to different width of roll gap were calculated, and the rolling force corresponding to different Kiss point height was calculated, finally, the rolling force distribution along the axis of the crystal roller was concluded. In combination with the formula of wear law which was derived from the experimental data, the wear distribution of crystal roller coating along the axis was calculated, the wear curve along the axial direction of the crystal roll in this paper can provide a theoretical basis for the initial profile design of crystal roll, and provide the data support of the improvement of the life of crystal roll and product quality.