The paper deals with steel surface treatment, blackening and phosphating of zinc and a production line that will perform these treatments. With the help of simulations were validated its various options and variants in which is able to work and produce. A variant has been developed for each surface treatment, as well as the simultaneous execution of both surface treatment at the same time. The paper describes both surface treatments, their types and then the line that will deal with these surface treatments in the production conditions. Surface treatments are divided into two groups. One group is the division of steel blackening methods. The second group describes the possibilities and types of phosphating. With the help of the simulation, the individual production variants for individual modifications as well as the concurrent model of the implementation of both surface treatments and the evaluation of the effectiveness of individual variants were revised. At the same time, the need to occupancy the production line with employees in individual variants and their benefits is also evaluated. We used the Tecnomatix Plant Simulation software module to create the simulation.Keywords: Surface treatment, simulation, blackening, phosphating
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