Dimensional Characteristics of Products Using Rotary Swaging Machine with Four-Dies

Lim, Seong Joo; Choi, Hyungsoo; Na, Kyoung Hoan; Lee, Chi Hwan

doi:10.4028/www.scientific.net/ssp.124-126.1645

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…Consequently, the impact pattern is further distorted. Despite this inhomogeneity and the discontinuous nature of the process, the combination of the axial feed per stroke value l st of the part and the circumferential shift of the dies between consecutive strokes allows for producing parts with constant external properties, like final diameter, length, roundness and surface roughness, over the entire formed length [6]. During the process, every spot of the finished part experiences about 100 effective strokes.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been carried out to establish optimal process conditions concerning surface quality and geometry, e.g., by analyzing the influence of dry process conditions [5], feed per stroke values [6], radial feed per stroke values during plunge rotary swaging [7] or true strain [8]. Furthermore, the internal properties of the part, such as its microstructure, hardness and residual stress components, which are important for its strength, have been investigated: Lim found that the hardness at the outer surface increased with increasing diameter reduction of steel tubes [9] and Kocich stated that rotary swaging induces a strong fiber texture in tungsten heavy alloys [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Process Fluctuations on Residual Stress Evolution in Rotary Swaging of Steel Tubes

et al. 2019

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Infeed rotary swaging is a cold forming production technique to reduce the diameter of axisymmetric components. The forming is achieved discontinuously by a series of radial strokes that are spread over the shell of the part. Due to tolerances within the rotary swaging machine, these strokes perform individually and the resulting stroke pattern is not homogeneous with regards to circumferential and longitudinal distribution. Nevertheless, in combination with the high number of performed strokes and the large contact area between the dies and the part, the external part properties, such as diameter, roundness and surface roughness, show even values along the finished part. In contrast, strength-defining internal part properties, like microstructure and residual stress components, are more sensitive to the actual pattern and temporal sequence of the individual strokes, which is investigated in this study. The impact of process fluctuations during the conventional process, which are induced by the tolerances of machine tool components, was verified by numerical simulations, physical tests and measurements of residual stress distributions at the surface and at depth. Furthermore, a method is introduced to maintain the stroke following angle ∆φ at zero by flat dies, and thus the actual pattern and temporal sequence of the strokes was homogenized. The results show that the residual stress fluctuations at the surface could be controlled and reduced. Furthermore, it is demonstrated that the depth profile of the residual stresses at a distance of 300 µm from the surface developed independently from the process fluctuations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Process Fluctuations on Residual Stress Evolution in Rotary Swaging of Steel Tubes

et al. 2019

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“…But also process parameters influence the workpiece quality. The surface finish strongly depends on the feed rate of the workpiece [3], whereas the variation of the final diameter mainly depends on the overall deformation degree [4].…”

Section: Introductionmentioning

confidence: 99%

Mechanische Eigenschaften rundgekneteter Stahlkomponenten

Charni

Ortmann-Ishkina

Herrmann

et al. 2021

Forsch Ingenieurwes

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The radial infeed rotary swaging is widely used as a diameter reduction forming process of axisymmetric workpieces, improving the mechanical properties with excellent near net shape forming. In the present study, rotary swaging experiments with different parameter setups were performed on steel tubes and bars under different material states and several resulting property modifications were investigated such as stress-strain curve, hardness, fatigue strength and surface residual stresses. The results show a significant work hardening induced by the rotary swaging process and an improvement in the static and dynamic mechanical properties was observed. Furthermore, the hardness distribution was homogenous in the cross section of the rotary swaged workpieces. Moreover, depending on the process conditions, different residual stresses distribution were generated along the surface.

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“…With the work hardening effect, the strength of the workpiece can be improved, which makes it possible to replace some expensive materials with cheaper materials [3,4]. Additionally, after the process, the surface condition could be improved with a lower roughness than the initial state [5]. Except for widely used structural steel and soft materials like aluminum, this process is able to deform metals like titanium, magnesium, and tungsten [6].…”

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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Dimensional Characteristics of Products Using Rotary Swaging Machine with Four-Dies

Cited by 12 publications

References 4 publications

Influence of Process Fluctuations on Residual Stress Evolution in Rotary Swaging of Steel Tubes

Influence of Process Fluctuations on Residual Stress Evolution in Rotary Swaging of Steel Tubes

Mechanische Eigenschaften rundgekneteter Stahlkomponenten

Material Flow in Infeed Rotary Swaging of Tubes

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