The Research of Surface Roughness Parameters and Accuracy of Additive Manufacturing

Production of high quality parts for the aerospace industry by selective laser melting is an important area of modern manufacturing. However, research literature does not have sufficient information for a justified selection of the melting modes to achieve the desired surface quality and fulfil the requirements specified by the design documentation. This study aims to further develop this topic. The results of the tests to determine the effect of selective laser melting modes on the quality parameters of the surface layer of are presented. The tests are performed on samples made of the heat-resistant nickel alloy EP648. The dependencies of the height parameters of the profile roughness on the speed of laser beam scanning are obtained. The influence of the synthesized part location in relation to the substrate plate on the surface roughness is shown. Technological recommendations on the choice of manufacturing modes for crucial parts are developed. The dependency of the roughness parameter Rz on the technological allowance for the final size is determined. A theoretical explanation for the mechanism of melted particles accumulation on the microrelief of the obtained surface is proposed.

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