Czasopismo nowoczesnego górnictwa

Nr 3/2023 (555)

DOMINIK BUKSA, PAWEŁ MADEJSKI, MICHAŁ KARCH

Rapid prototyping of water nozzles using CFD modeling and 3D printing results

Rapid prototyping of water nozzles using CFD modeling and 3D printing results In recent years, there has been greater interest in rapid prototyping methods employed in various industries. Prototypes are increasingly often made using 3D printing technology, which is mainly due to the relatively low costs of developing and producing such a structure and the short time needed for their physical production. The work presents the possibility of using rapid prototyping techniques, such as water propulsion nozzles. They are mainly used in the energy industry, e.g. for the production of water mist in jets or condensers.
Such nozzles enable the formation of a stream, and its range and efficiency depend on the design requirements. CFD (computational fluid dynamics) tools and 3D printing will be used to assess the nozzle’s effectiveness. A 3D printer based on FDM technology was used to produce nozzle prototypes. The CFD results were verified with experiment. Analyzes for four different nozzle shapes are presented and the discrepancies between the results of the initial experimental and numerical analyses are explained. To indicate the imperfections resulting from 3D printing, a 3D scanner was used to show the internal cross-section of the nozzle. The research conducted indicates the significant potential of 3D printing in rapid prototyping and its effectiveness in creating functional models for various engineering applications.

Key words: CFD, rapid prototyping, 3D printing, water nozzles

https://doi.org/10.7494/miag.2023.3.555.7

PAWEŁ GARA, YAROSLAV FEDOROVYCH, BOGDAN KOPEY

A study of the resistance of sucker rods to fatigue failure

The article presents the results of laboratory tests on the fatigue of samples made from fullscale sucker rods of 15H2GMF steel in various corrosive environments. For comparison, similar tests were carried out on corrosion fatigue of samples made from fullscale sucker rods of steels 20N2M, 15H2NMF and 15N3MA. The limited endurance limit of the tested rods of 15H2GMF steel in formation water is 22 lower than that of 20N2M steel and 13 lower than that of 15H2NMF steel, and in an environment simulating the action of H2S it is 34 lower than that of 20N2M steel and 32 lower than that of steel 15H2NMF. The results were obtained using a complex surface method of strengthening sucker rods, which was developed in the laboratory of the Department of Oil and Gas Machines and Equipment of the Ivano-Frankivsk National Technical University of Oil and Gas and tested at the NGVU “Dolynanaftogaz”.

Key words: fatigue damage, corrosion fatigue, pump rod, drilling

https://doi.org/10.7494/miag.2023.3.555.37

GRZEGORZ OLSZYNA, TOMASZ ROKITA, ANDRZEJ TYTKO

A new approach to the assessment of the fatigue life of typical steel ropes

The issue of the future prediction of the technical condition of ropes during their operation is a very important issue related to the safety of use and operation of the devices. Steel wire ropes, as load bearing elements, are subject to degradation through various forms of wear during operation. Variable loads cause a complex state of stress in the wires, which translates into different tensile, twisting and surface pressures between the wires. Ropes are also exposed to difficult working conditions, e.g. corrosive environment, fatigue wear, which consequently leads to a weakening of their functional properties.
Ropes, as responsible elements, require an accurate and at the same time simple way of predicting their failure-free operation in a simple and unambiguous manner. This article concerns a new approach to determining the fatigue life of steel ropes. The issue of safety related to steel ropes has been a difficult and ambiguous issue for many years to determine without knowing the fatigue life of the object. The paper discusses experimental and practical methods for determining the fatigue life of steel ropes.

Key words: steel wire ropes, fatigue durability, compacted ropes, wear

https://doi.org/10.7494/miag.2023.3.555.49

TOMASZ GÓRAL, STANISŁAW KRAWCZYK, JAN PAWLIK

Possibilities of manufacturing spatial elements using the 135 hardfacing method

3D printing with thermoplastic materials is slowly becoming commonplace as additive manufacturing has gained a large number of dedicated users over the past few years, and the prices of the requisite equipment have significantly dropped. However, in terms of materials, only plastics have enjoyed this popularity. Although metals are, in a sense, thermoplastic materials, their spatial application would require very advanced setups, which in turn generates high costs and complicates process control. This article discuss- es the possibilities of the additive manufacturing of metal elements using a three-axis
numerically controlled plotter combined with a semi-automatic welding machine using the 135 method. The authors also examined the impact of sudden changes in velocity vectors on geometric deviations.

Key words: 135 method, 3D printing, WAAM, hardfacing, additive manufacturing

https://doi.org/10.7494/miag.2023.3.555.71