Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion

Hrudkina, Natalia; Aliievа, Leila; Марков, Олег; Malii, Khrystyna; Sukhovirska, Liudmyla; Kuznetsov, Mykola

doi:10.15587/1729-4061.2020.212018

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…In this case, constructing a new kinematic module typically allows it to be used not only for one particular estimation scheme or process but for a suite of different schemes where it can serve as their element. At the same time, an important role belongs to the peculiarities of MKM application for modeling the processes of combined extrusion in accordance with the classification of basic strain sites (SSs): sequential, connected, combined, transit, and combined [16,21,24,31,32].…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

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Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module

Hrudkina

Levchenko

Aliiev

et al. 2022

EEJET

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Those parts of solid or hollow blanks whose shape is complex should be produced by means of combined radial-longitudinal extrusion. However, the use of combined extrusion processes with several degrees of flow freedom requires a preliminary assessment of shape formation, which is true, taking into consideration the peculiarities of evolution of strain sites at different stages of deformation. When deforming high blanks, the presence of an intermediate rigid zone can be observed, separating two autonomous strain sites. When constructing an estimation scheme of the initial stage of the process of combined radial-backward extrusion of hollow parts with a flange, the presence of an intermediate rigid zone is taken into consideration. The need to improve the devised estimation scheme is caused by significant deviations in the projected growths of a part from its experimentally derived dimensions. As an alternative to the axial rectangular kinematic module of the lower deformation site, the use of an axial triangular module has been proposed, whose effectiveness is demonstrated in simulating the process of radial-longitudinal extrusion with expansion. The rationality of the proposed replacement was revealed, both for forecasting the forced mode of the deformation process and for the gradual part’s shape formation. This has made it possible to reduce the projected estimates to 10 % in terms of the increase in the size of a part based on a comparative analysis with experimentally derived data. It is recommended to use the devised scheme for modeling the initial stage of the process for relatively high blanks at H0/h1>4…6; the limitation is the degeneration of the intermediate rigid zone. This will contribute to compiling recommendations for expanding the possibilities of using combined radial-backward extrusion of hollow parts with a flange during production

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Section: The Study Materials and Methodsmentioning

confidence: 99%

“…For processes with connected SS, the main task is to find the position of the boundary of two adjacent SSs with one degree of freedom of flow of metal [31] (Fig. 1, right pattern, SS-II-1 and SS-II-2).…”

Section: The Study Materials and Methodsmentioning

confidence: 99%

Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module

Hrudkina

Levchenko

Aliiev

et al. 2022

EEJET

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“…It was concluded that with an increase in the angle of inclination of the working edge of the tool, the uniformity of the distribution of deformations increases. However, an increase in crimping helps reduce the surface roughness of the workpiece but this may result in destruction of the product [17].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Testing a new technique for producing artillery cartridge cases from pipe workpiece by roughing with a friction tool

Markov,

Shevtsov,

Hrudkina

et al. 2023

EEJET

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The object of this study is the technological process of manufacturing parts such as artillery shells using pressure treatment methods. The work is aimed at solving the current scientific and technical task to improve the technological processes for manufacturing parts such as cartridge cases based on the use of a tangential rolling operation with a friction tool, which ensures the production of hollow products with a bottom. Using the finite element method, modeling of the bottom rolling processes was carried out, which made it possible to establish the effective geometry of the processed workpieces and their heating temperature. Recommendations have been devised for the design of new technological processes for roughing bottoms, which consist of determining the wall thickness of the workpiece before deformation, the heating temperature of the workpieces, and the amount of supply of the workpiece to the friction tool. The resulting recommendations were verified by experimental studies. Roughing of spherical bottoms should be carried out for pipes with a relative wall thickness (D/s) in the range of 15...20, the homologous heating temperature should be 0.8, and the relative feed of the workpiece into the friction tool should be 0.9. Testing the established relationships under laboratory conditions confirmed the recommendations for changing the shape of spherical bottoms during the roughing process. The results of metallographic studies on full-scale products confirm the results of the theoretical study. It is recommended to use this technique for products that have an axial hole (artillery shells, hydraulic cylinders, etc.), which will allow removing axial defects in the bottom after drilling the axial hole. The results could be used at machine-building enterprises in the manufacture of dual-use parts

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“…Methods of sequential radial-longitudinal extrusion are designed to obtain hollow parts. There are two variants of this method: with expansion (scheme 5 and 6) [5] and with reduction of metal during its radial flow (scheme 7) [4,6].…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of power parameters of combined three-direction deformation of parts with flange

Aliieva¹,

Markov²,

Aliiev³

et al. 2021

FME Transactions

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The upper bound power method is used to simulate the process of combined radial-backward-forward extrusion of hollow parts of the "cup with flange and branch pieces" type from a continuous workpiece. The calculation scheme with autonomous deformation zones is used, which contains modules with an inclined boundary and the condition for the equality of powers acting on both sides of the intermediate hard zone is accepted. This made it possible to more accurately determine the power regime and the prevailing direction of the metal flow, which is necessary to assess the character of the forming of the part. The comparison of theoretical and experimental values of the deformation pressures and the flow velocities with each other, as well as with the results obtained by the finite element method shows the feasibility of using the obtained functions for technological calculations of power parameters and evaluating of part forming.

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Predicting the shape formation of parts with a flange and an axial protrusion in the process of combined aligned radial-direct extrusion

Cited by 4 publications

References 16 publications

Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module

Estimating the initial stage in the process of radial-reverse extrusion using a triangular kinematic module

Testing a new technique for producing artillery cartridge cases from pipe workpiece by roughing with a friction tool

Analysis of power parameters of combined three-direction deformation of parts with flange

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