Bore Quality of Shotgun Barrel Blanks

Jankovych, Robert; Hammer, Milos; Harcarik, Matej

doi:10.17973/mmsj.2015_12_201550

Cited by 6 publications

(4 citation statements)

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“…Each technological procedure leaves unevenness on the surface, which can negatively affect the required function of the surfaces [14]. These inequalities must be assessed in terms of their size and geometric character and confront the identified state with the requirements formulated in the technical documentation.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Nitriding on the Geometric Accuracy of Parts of Special Technology

Dobrocký

Pokorny

Studeny

et al. 2020

METAL 2020 Conference Proeedings

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The current development of chemical-heat treatment technologies is aimed at increasing the utility properties of components and improving the quality of the produced surface. A prerequisite for a quality produced surface is the selection of a suitable method of surface machining before the application of chemical-heat treatment technology. Due to the requirements for functional areas of special technology, grinding is chosen in most cases. The present paper deals with the effect of nitriding in plasma and gas on the geometric accuracy of parts made of 42CrMo4 steel. This steel is widely used in special technology for the production of barrels, breech-block cases, ball screws and gears. On the ground steel samples, the 3D measurement on the coordinate measuring machine analyzed the change of dimensions after the application of nitriding in plasma and gas. Furthermore, the surface texture change was evaluated using 2D surface roughness parameters and 3D parameters of area. After nitriding in both plasma and gas, the dimensions increased by 0.034 mm in diameter. After the nitriding processes, the values of 2D and 3D surface roughness parameters decreased. A change in surface texture was observed when evaluating 3D parameters in both chemical-heat treatment processes. Increasing the dimensions and changing the texture of the surface affects the subsequent function of the components.

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Section: Introductionmentioning

confidence: 99%

The Influence of Nitriding on the Geometric Accuracy of Parts of Special Technology

Dobrocký

Pokorny

Studeny

et al. 2020

METAL 2020 Conference Proeedings

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“…As a consequence of constraints inherent to the latter method, roughness was only calculated for areas 1 and 2. The outputs of this method are detailed in Table 2 [10,11]. It was not possible to analyse height parameters according to ČSN ISO 4288:1999 due to large differences in roughness of the samples.…”

Section: Resultsmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Robl¹,

Sedlák²,

Pokorny³

et al. 2020

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The paper deals with analysis of samples made of Inconel 718 nickel superalloy, produced using direct metal laser sintering (DMLS), known as "sintering", and precision casting technologies. The theoretical part is focused on the characteristics of producing samples of the nickel superalloy by modern additive methods (those for processing metallic materials) and by the conventional technology of precision casting. The practical part involves the investigation of the mechanical properties and texture of the surfaces of the tested samples. A significant part of this study is devoted to analysis of fracture surfaces and EDX experimental testing of TEM lamella by using of electron microscopy methods. The conclusions of this paper include a discussion, evaluation and explanation of both technologies applied on tested samples. Finally, the main benefits of using modern additive technologies in the design and production of heat-resistant components of turbochargers are discussed.

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“…roughness [21]. Of course, the main disadvantage of the created compound layer is still the degradation of surface topography, especially the increase in roughness which is given in Table 3.…”

Section: Discussionmentioning

confidence: 99%

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

Pokorny¹,

Dobrocký²,

Kadlec³

et al. 2018

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The chemical composition of the steel is one of the primary characteristics that influence the mechanical properties of high-stressed machine parts such as barrels of small arms weapon. Heat treatment is the most important technology to reach requested mechanical properties. By a suitable combination of mechanical and tribological properties, it is possible to improve the surface of highly stressed parts as to improve the wear resistance of barrel surface. Thus, surface technology is next step for obtaining new properties as tribological properties or preferable mechanical properties. Due to obtain suitable microstructure and wear resistance the samples of C35, 34Cr4, 37Cr4 and 42CrMo4 were heat-treated with following chemical heat treatment by gas nitriding process, for 6 hours. This paper deals with the influence of alloying elements of structural steels on surface microhardness and depth of diffusion layer. The gas nitriding process caused the creation of a compound layer on the surface of the steel. This layer leads to significant improvement in wear resistance. The concentration of alloying elements was analysed by OES methods. The technology of nitriding was applied to annealed, tempered and quenched steels. After chemical heat treatment, new surface morphology was created. The surface layers of the samples were analysed by microhardness method; surface morphology was evaluated by SEM method. Experimental part concerns structural steels with a concentration of alloying elements to 1 wt.%. In experimental part, the influence of alloying elements on the diffusion process in Fe-C system and the microhardness of the surface was proved.K e y w o r d s : gas nitriding, microhardness, chemical composition, diffusion, barrel

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Bore Quality of Shotgun Barrel Blanks

Cited by 6 publications

References 0 publications

The Influence of Nitriding on the Geometric Accuracy of Parts of Special Technology

The Influence of Nitriding on the Geometric Accuracy of Parts of Special Technology

Bulletin of the Polish Academy of Sciences: Technical Sciences

Influence of alloying elements on gas nitriding process of high-stressed machine parts of weapons

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