Investigating the process of shrinkage depression formation at the combined radial-backward extrusion of parts with a flange

Hrudkina, Natalia; Aliievа, Leila; Abhari, Payman; Марков, Олег; Sukhovirska, Liudmyla

doi:10.15587/1729-4061.2019.179232

Cited by 22 publications

(26 citation statements)

References 12 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of well-known elementary rectangular modules does not cause difficulties because of their good integration with more complex schemes. However, to describe the flow of a material in the kinematic elements with curved boundaries, which adequately describe the surfaces of the section of the material flow inside a part or the shape of the contact surfaces of the tool, it is necessary to develop modules with sloping and curved boundaries [11,16,26]. In constructing estimation schemes of combined extrusion, the main difficulties relate to cumbersome calculations of the amount of the reduced pressure and often the impossibility to derive this value in an analytical form.…”

Section: Energy Methods For Calculating the Force Regime And Incremmentioning

confidence: 99%

“…Based on the analysis of literary data of recent years, it is possible to outline a range of major issues in the study of basic cold extrusion schemes and combination extrusion processes with several degrees of metal flow [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…However, the proposed modification of the energy method is used in solving non-symmetric problems. The issues of deformability of blanks, assessment of extreme shape formation, and defection during combined extrusion were tackled in [13][14][15][16][17][18]. Work [13] modeled the combined extrusion process in order to assess the extreme shape formation of blanks made from different materials.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…That provided information about the resource of exhaustion of plasticity in the flange area for various materials. Work [16] investigated the estimation scheme of the combined radial-reverse extrusion process in terms of the occurrence of a shrinkage cavity in the bottom part of the cup. However, the terms of its use have not been studied for a wider range of process geometric ratios, which significantly narrows the scope of its application.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…A series of papers addressed the development of phenomenological approaches to assessing the complex strained-stressed state (SSS) and the utilized resource of plasticity in the processes of pressure treatment [17,18]. Thus, studies [13][14][15][16][17][18] are aimed at assessing the technological possibilities of the combined extrusion processes in terms of SSS research, exhaustion of the resource of plasticity, and defection. However, the issues of predicting the mismatch in the shape and the required size of the extruded workpiece were not tackled.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

See 4 more Smart Citations

Predicting the shape formation of hollow parts with a flange in the process of combined radial-reverse extrusion

Hrudkina¹,

Aliievа²,

Марков³

et al. 2020

EEJET

Self Cite

View full text Add to dashboard Cite

The simulation of the process of combined radial reverse extrusion of hollow parts with a flange has established two fundamentally different, in terms of the components of the kinematic modules, calculation schemes CDZ-1.i and CDZ-2.j, taking into conside ration the possible shape of the boundary of the section of a metal flow inside a workpiece. The comparison of the dependences of the optimal relative rate of metal outflow in the opposite direction for different schemes indicates significant differences in the resulting values in the course of the deformation process. The relevance of this study is due to making it easier to evaluate the use of the combined extrusion process to produce hollow parts with a flange while maintaining the required dimensions compared to simple deformation schemes. We have identified the lack of detailed studies into the technologies for the introduction of combined extrusion schemes, as well as the absence of technological recommendations for determining the force regime and the shape formation of a semi-finished article. The process of the combined extrusion of hollow parts with a flange was investiga ted, thereby selecting different types based on the nature of the metal flow depending on the geometric ratios of the deformation process. We have obtained experimental data on the gradual shape formation of a semi-finished product in the process of deformation at different geometric ratios. The limits of using estimation schemes of the process have been defined to obtain data on the increments in a semi-finished product, including in terms of predicting the formation of a shrinkage cavity in the bottom part. It is recommended that a condition of selecting the appropriate scheme should be the condition for a minimum value of the reduced pressure of deformation i < j. The resulting recommendations make it easier to predict the shape formation and the force mode of extrusion (a deviation from experimentally obtained data can be reduced to 10 %), which would contribute to evaluating the rationality of the combined extrusion processes while ensuring the required dimensions of a part

show abstract

Section: Energy Methods For Calculating the Force Regime And Incremmentioning

confidence: 99%