Технологія і техніка друкарства (Apr 2018)
Increasing the Wear Resistance of Parts of Printing Equipment by Modifying their Surfaces by Ion-Plasma Nitriding
Abstract
In order to create high-quality equipment in polygraphic production, it is first necessary to use parts and aggregates with increased durability and reliability. Currently, there are a large number of different methods of chemical-thermal treatment of materials in which the surface of metal parts is saturated with other elements using diffusion penetration. Methods, which used for the nitriding of steel parts in the glow discharge, that not only reduce the process in time, but also obtain a high class of surface cleanliness that does not require further treatment, and also resort to economical and safe methods that eliminate the need for the use of ammonia. More and more alternative ion-plasma technologies are being used with the ammonia-free multicomponent gas environments. Experimental data on these processes have not yet been completely studied, their results are not systematized, so there is very little information about the structure, phase composition and properties of the surface layers of steel parts subjected to nitration according to these techniques. The modern methods of chemical-thermal treatment for the strengthening of steel parts working under conditions of friction and exposed to high physical and chemical load are analyzed. A comparison of methods of strengthening by modifying their surface layers as a result of saturation with nitrogen for the identification of the most promising and effective method. The preliminary results of studies on cylindrical details of printing equipment showed that the average duration of the complete technological process of ion nitriding in a high-frequency helicon discharge sample of structural steel was reduced by 10 times compared with ion nitriding in a glow discharge with similar results of increasing the microhardness of the surface layer to a certain depth. The conclusion about the prospect of research and application of the method of ion nitriding in high-frequency helicon discharges in an hydrous environments has been made to strengthen the steel surfaces of printing equipment components in view of its advantages over other methods.
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