The paper discusses a method of chemical polishing of Ti6Al4V samples and presents the results of our study. The samples were produced by selective laser melting, which is an increasingly popular method of producing thin-walled, geometrically complex products. The document analyzes how polishing with solutions featuring a varying content of hydrofluoric and nitric acids affects the etching rate and alters the superficial roughness of the samples in both the longitudinal and the transverse directions. We have thus formulated the recommendations on the optimum composition and concentration of such acidic solutions for polishing Ti6Al4V products made by selective laser melting.

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The article shows the results of experimental investigation influence of process conditions on parameters, defining plastic deformation, during diamond burnishing process: maximum of micro-hardness and depth of hardened layer (depth of workhardening). Empirical dependences, linking the maximum of micro-hardness and depth of workhardening to the diamond burnishing process parameters, were obtained on the base of the experimental investigation.

In this paper the mathematical model and the program based on this model for efficient process conditions during a diamond smoothing is introduced. The mathematical model has been tested with heatproof martensite category steel FeC0.15Cr12Ni2 by the synthetic diamond DSB-1 using as a smoothing tool. The mathematical model takes into account plastic deformation degree which could have both smoothing and reinforcing nature. Through the smoothing conditions the surface has a microroughnesses crumpling but reinforcing conditions involve also surface layer microhardness increasing.

A traveling sphere by an elastic cylinder surface boundary problem is considered. At a contact zone the friction force and adhesive bond areas are supposed. The received solution enabled to estimate a plastic deformation area. The experimental and calculation data comparison found the acceptable accuracy of plastic deformation depth estimation. The devised methodology makes it possible to estimate the radius joining points depth of the plastic deformation by sphere.