ADDITIVE METAL PROCESSING TECHNOLOGIES - PROBLEMS AND WAYS OF LEVELING THE SURFACE DEFECTS

This work provides an overview of the technological features of additive technologies for manufacturing metal parts and products (3D printing metals). The nature and types of printing, perspectives, and opportunities for their development are indicated. The advantages and disadvantages of additive technologies are clarified. An analysis of the technological process parameters has been made, on the basis of which the main problems hindering its mass introduction in the industry have been identified. The main dependencies of the quality and properties of the manufactured parts on the process parameters are given, and ways of avoiding and eliminating the defects are presented

ELIMINATION OF IRREGULARITIES AND DEFECTS ON STEEL SURFACES THROUGH ELECTRO SPARK SURFACE MODIFICATION WITH ALUMINUM ALLOYS

The surface roughness of the parts has a significant influence on their performance properties and it is crucial for the friction force and wear of the bodies. Therefore, in practice it is often necessary to perform finishing treatment to reduce the macro, micro and meso- roughnesses - grinding, honing, lapping, polishing and more. In this study are examined the possibilities of reducing the roughness and the traces of the previous machining of steel surfaces by electro-spark deposition (ESD) with low-melting aluminium alloys. The roughness of the steel surfaces obtained after different milling modes after subsequent electrospark coating was investigated. Dense and uniform coatings with different surface microgeometry are obtained, which to a different extent erase the traces of the preceding processing. The examination of tribological characteristics showed a significant increase in the wear resistance of the coated surfaces. The process parameters and materials for ESD at which coated surfaces have simultaneously the lowest roughness and the highest wear resistance have been determined and optimized