ALGORITHM FOR CALCULATING THE SURFACE ROUGHNESS PARAMETERS OF A PART MADE USING ADDITIVE TECHNOLOGY

The calculated dependences for determining the surface roughness parameters of a part made by selective laser fusion from materials that are certified and widely used in the aircraft engine industry are presented. A comparison of the values of the height parameters of the roughness obtained by calculation and on the basis of the experiment is presented. On the basis of the presented dependencies, a calculation algorithm is developed, which is the basis of the software for calculating on a computer.

ELECTROCHEMICAL TREATMENT OF PARTS OBTAINED BY SELECTIVE LASER FUSION

The use of additive technologies for the production of parts is one of the main trends in recent years in the field of industrial production. Application of the technology of «layer-by-layer growing» provides savings in materials, a significant reduction in labor intensity, and allows you to create parts of any complexity and configuration. To reduce the surface roughness values of parts manufactured using additive technology, the authors proposed a method of electrochemical treatment in acid electrolytes, which makes it possible to achieve a decrease in surface roughness values by more than 5 times compared to the original one, and to process parts of any complexity and configuration.

Effect of pulsed ion-plasma impact and electron irradiation on mechanical properties of precipitation-hardened Inconel 718 alloy

The effect of pulsed ion-plasma irradiation in the Plasma Focus installation and irradiation with 20 MeV electrons at the Miсrotron-ST accelerator on the mechanical properties of the precipitation-hardening Inconel 718 alloy obtained by the method of selective laser fusion has been studied. It was found that ion-plasma and electron irradiation does not affect the properties of the alloy, which is explained by the small thickness of the modified layer during PF irradiation and insufficiently high electron fluence for the manifestation of radiation-stimulated processes of redistribution and dissolution of dispersed precipitates of the strengthening phases. The results obtained indicate a high resistance to crack propagation and the absence of a tendency of the studied alloy to embrittlement.

METHODS ADDITIVE MANUFACTURING OF MAGNESIUM ALLOYS (review)

The development of industrial production in the modern world cannot do without the use of new technologies. This article discusses various methods for the additive manufacturing of magnesium alloy parts. There are several alternative methods for producing parts, such as selective laser fusion, direct laser deposition and arc welding. Depending on the additive manufacturing method, finished parts will differ in structure, phase composition and mechanical properties. The article presents a comparison of traditional and additive manufacturing methods for parts.

INTRODUCTION OF RAPID PROTOTYPING IN SOLVING APPLIED PROBLEMS IN PRODUCTION

All conveyor lines and machines should work smoothly in order to ensure a well-timed production during production. There are parts and nods, the failure of which leads to the failure of the entire conveyor. It is the delivery time and financial losses due to equipment downtime that make the problem of quick reproduction of the relevant part to replace the original one. In this work, the process of creating a test piece using selective laser fusion (SLS) technology was considered. In this case, the economic efficiency of the fabrication of products depends directly on the effective and correct solution to the problems of technological preparation of additive production. The printed model was tested in direct contact with water for 500 hours. Fatigue tests were performed using 40% primary and 60% secondary powder ratios. To quantify the properties of the material for given geometry, a series of tensile testing of products was carried out. To identify the best ratio of strength, elasticity, and manufacturing cost for testing, samples were offered with different percentages of powder. It was noted that the cost of manufacturing spare parts, tools, and accessories (SPA) using 3D printing depends on many factors. The product geometry determines their volume, and the density of their arrangement in the chamber was recognized as a crucial impact factor. The accumulated experience and analysis of the criteria allowed us to offer several layout options that can lead to a maximum economic effect.