Visualization of Axial Material Flow by Eccentric Thread Swaging

Ishkina, Svetlana; Schenck, Christian; Herrmann, Marius; Kuhfuß, Bernd

doi:10.1016/j.promfg.2020.04.255

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…The longitudinal flow of the material decreased when the friction coefficient and the die angle increased. Ishkina S [13] [14] et al designed the eccentric flat die (EFSD) by changing the die geometry. This new structural form can produce asymmetric material flow in the workpiece, leading to microstructural changes.…”

Section: Introductionmentioning

confidence: 99%

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Multi-objective optimization of forging surface structure parameters of radial forging die with cycloidal

Wang¹,

Wang²,

Xu³

et al. 2023

Preprint

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To improve the strain homogeneity and damage homogeneity of radial forging hollow shaft. Proposed radial forging die with a cycloid as a generatrix entrance surface. The effects of the structural parameters of the die forging surface, such as the radius of cycloid base circle (R), the length of sizing zone (L) and the radius of sizing zone (r) on the strain homogeneity and damage homogeneity of the machined shaft were investigated. Numerical simulations were performed according to the orthogonal design L25, and an artificial neural network approach was used to develop a mathematical prediction model and apply it to the optimization process of the genetic algorithm. The results show that the optimized structural parameters of the compromise solution are R = 68.27mm, L = 49.36mm, r = 11.01mm, εσ and Cσ are 0.2113 and 0.02562, respectively. Compared with the original structural scheme, εσ is reduced by 21.83% and Cσ is reduced by 31.58%, which indicates that the plastic deformation is more uniform and the machining damage is less during the hollow shaft forging process.

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Section: Introductionmentioning

confidence: 99%

“…Fig 14. Effective strain nephograms of radial sections at 110 mm, 80 mm and 50 mm from the machined end face for Scheme I and Scheme II…”

mentioning

confidence: 99%

Multi-objective optimization of forging surface structure parameters of radial forging die with cycloidal

Wang¹,

Wang²,

Xu³

et al. 2023

Preprint

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“…The cross section of the axially fed work piece becomes reduced. Due to the rotation of the swaging spindle relative to the work piece, a constant circumferential shaping can be obtained [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The local strain distribution calculations were verified using experimentally available data on Inconel 718 [21]. FEM analysis based on plane 2D elements was used for determining the state of stress and analysis of the metal flow in swaging [8].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Singh

Kalita

Narayanan³

et al. 2020

Metals

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Zirconium alloy has been extensively used as a cladding material in nuclear power reactors due to its low neutron absorption cross section, excellent mechanical properties, and corrosion resistance. The influence of the swaging parameter, feed rate (0.7, 1.25, 2 m/min) on residual stress induced in Zr-4 alloy is investigated in the present work. A three-dimensional finite element model was implemented in the Deform 3D software to simulate the rotary swaging (RS) process over a circular rod of Zr-4 alloy. The simulation results based on the 3D framework provide a detailed insight of residual stress, true stress versus true strain and force applied over the rod during the multiple pass swaging process; the results are compared with experimental results. The experimental hole drilling method is used to determine the residual stresses on swaged zirconium alloy at different feed rates (0.7, 1.25, and 2 m/min). A similar trend of residual stress between experimental and numerical results from the surface to the center on the swaged rod samples is observed. The same magnitude of residual stress at the surface of the swaged Zr-4 rod is also observed. It is found to be compressive at the surface and tensile in the center of the samples, as observed in the present work.

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“…For softer material like aluminum, the locations of neutral plane were closer to the deformed part than for harder material like steel. To visualize the axial material flow in eccentric thread swaging, Ishkina et al [19] developed a special die on which a small cam was manufactured, they found that the pitch of the resulting thread is not constant over the feeding direction, which means an increasing fluctuation of the axial material flow. In the former research [20], rod workpiece with different friction coefficient was investigated in rotary swaging, it was found that the 1 4 radial material from the outer surface is sensitive to friction condition, and that on the center of the axis and the ends of the reduction, the local material flow is most active.…”

Section: Introductionmentioning

confidence: 99%

Material Flow in Infeed Rotary Swaging of Tubes

Liu

Herrmann

et al. 2020

Materials

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Rotary swaging is an incremental metal forming process widely used to reduce the cross–section of parts. For tubular parts, the final wall thickness also changes during the process. The lubricant condition is a factor, which affects these geometry changes. Beneath the change of the geometry, the complex material flow during the process determines the final geometry and the mechanical properties. Therefore, with a thorough insight into the material flow, it could be understood how to control it in order to achieve desired properties. Producing tubes with uniform outer diameter and changing inner profiles is an application of this method. Furthermore, applying this method, different local cold hardening could be achieved by different total strain. In this study, the dependency of the material flow on the lubrication conditions was investigated. Simulations with combined hardening material models were verified by the change of the wall thickness of tubes. It was found that friction condition significantly influences the back shifting of the workpiece and the elongation caused by each stroke. Results from simulations and experiments showed that a certain lubricant condition leads to the highest axial elongation of the workpiece.

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Visualization of Axial Material Flow by Eccentric Thread Swaging

Cited by 4 publications

References 10 publications

Multi-objective optimization of forging surface structure parameters of radial forging die with cycloidal

Multi-objective optimization of forging surface structure parameters of radial forging die with cycloidal

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Material Flow in Infeed Rotary Swaging of Tubes

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